Dissertations / Theses on the topic 'Air'
To see the other types of publications on this topic, follow the link: Air.
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Air.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
woods, Clay W. "Movement of Air Through Submerged Air Vents." DigitalCommons@USU, 2011. https://digitalcommons.usu.edu/etd/1074.
Full textAbstract:
A series of physical models consisting of three different diameter pipes at the same 4% slope were studied at the Utah Water Research Laboratory (UWRL). Various combinations of air flow and head on the pipe were used to determine the effect of pipe diameter, head, and air flow on the behavior of air bubbles introduced into the pipes and to determine the venting capacity of the pipes. It was determined that neither bubble velocity nor bubble length changes with pipe diameter or head changes within the range tested. It was also determined that bubble velocity and length will increase with increased air flow. Bubble velocity also increased with increasing bubble length consistent with prior research. Overall the venting capacity of a pipe is dependent upon having a large enough pipe to prevent slug flow. A procedure was developed to aid in the sizing of submerged vent piping during the design of pipelines based on the data collected during this study and utilizing prior research.
2
Kang, Bryan H. (Bryan Heejin). "Air-data estimation for air-breathing hypersonic vehicles." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/47394.
Full text
3
Cheng, Zhao 1969. "Flow problems in air venting and air sparging." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/9593.
Full textAbstract:
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1998.Includes bibliographical references.
Soil Vapor Extraction (SVE) and Air Sparging have been used for site remediation for about ten years, but most of the past designs are based on experiences and numerical models. Understanding toward the physical problems is far from complete, and some simplified assumptions used in those models may not be true. In this thesis, we focus our attention on the hydrodynamic problems in SVE and air sparging. In Chapter One some basic concepts related to the fl.ow problem in the porous media such as soil are introduced, and previous models for SVE and air sparging are reviewed in some detail. The SVE model is derived in Chapter Two. Specifically we examine the water table rise during SVE. In Chapter Three, A mathematical model for steady state air sparging is describe. Unlike previous models(Van Dijke et al, 1995), the air phase compressibility is accounted for. Numerical methods are used to solve the governing equations. Results are compared with two dimensional laboratory experiment(Ji et al, 1993) and field data(Lundegard, 1995). The most important parameter in air sparging system design is the Radius Of Influence(ROI) of the sparging well{McCray 1997). Computations are performed to reveal the relationship between ROI of a sparging well to other parameters such as air sparging pressure, well screen length, soil properties etc,. Air sparging is typically used in conjunction with a soil vapor extraction system to collect the volatilized compounds above the water table. The use of air sparging results in a net positive pressure in groundwater, and can lead to contaminant migration to previously uncontaminated areas. In Chapter Four, we discussed the coupling effects of SVE and air sparging system. Some interesting phenomena are revealed and discussed.
by Zhao Cheng.
S.M.
4
Al-Ghamdi, Abdulmajeed Saeed. "ANALYSIS OF AIR-TO-AIR ROTARY ENERGY WHEELS." Ohio University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1146201291.
Full text
5
Dunsby, Joshua William. "Clarifying smog : expert knowledge, health, and the politics of air pollution /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC IP addresses, 2001. http://wwwlib.umi.com/cr/ucsd/fullcit?p3031941.
Full text
6
Золотова, Світлана Григорівна, Светлана Григорьевна Золотова, Svitlana Hryhorivna Zolotova, and N. A. Radcko. "Air conditioning." Thesis, Видавництво СумДУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/13511.
Full text
7
Silyuk, O. V., and T. N. Burenko. "Air pollution." Thesis, Вид-во СумДУ, 2007. http://essuir.sumdu.edu.ua/handle/123456789/17563.
Full text
8
Solman, Dario. "Air files." The Ohio State University, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=osu1318871694.
Full text
9
Ibrahim, Abdul. "Air Engine." Thesis, Ibrahim, Abdul (2016) Air Engine. Honours thesis, Murdoch University, 2016. https://researchrepository.murdoch.edu.au/id/eprint/33939/.
Full textAbstract:
The Murdoch University Air Engine project was built for Industrial Computer System Engineering (ICSE) students to implement and fundamentally develop a significant understanding of the 68HC11 Microcontroller. This system was developed and designed by third-year undergraduate students for their project with the help of Murdoch University’s technician and electrician staff for installation of hardware equipment and information technology (IT) related task. This project is a learning tool that provides hands-on experience with industrial-grade equipment and the environment. This also includes maintenance and improvement of its functionality as a part of the on-going thesis project.
Air Engine was one of the first engine designs that helped to introduce the concept that an engine can be used to run a vehicle. Throughout the years, different designs have been implemented, and some of them were successful such that they were utilized in the powering vehicles. Also, it is versatile, therefore, can be used in operations where immense power is required. However, the basic principles of an engine remain almost the same since cylinders, and other associated components are used to run it.
The project deals with an Air Engine controlled by a microcontroller. The primary objective of this project is to develop an embedded and real-time control system based on the Forth programming language. Other associated aims are to incorporate user interaction via a keypad and LCD screen which make significant use of the timing interrupt system capabilities for the inputs and outputs available. Also implementing a form of control for cylinder firing sequences, designing the wiring diagram, improving the safety feature, implementing set input of Revolution Per Minute (RPM) via keypad and maintain the rotational speed was undertaken.
The project is now complete and fully operational with fully functioning hardware configurations and programming language. Additionally, the programming code has been modified and recreated using simplified code words which make it easier to understand. As well, extensive documentation is provided to help for the future development of this project.
10
Wei, Cheng. "Air Induction System (AIS) Optimization." Thesis, KTH, Fordonsdynamik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-198507.
Full textAbstract:
Air intake system (AIS) plays an important role on affecting the performance of the engine and the vehicle. The design and optimization of the structures and materials of AIS contributes to producing a quality reliable system, reducing noise, cost and weight at the same time, which are significant to improve the performance of engine and vehicle. Fresh air hoses/pipes are intended to transport, in air cleaner purified, air from the air cleaner to the throttle fitted on the inlet manifold or to the compressor fitted to the exhaust manifold. Air cleaner box is responsible for filtering out the dust and impurities in the air. The charge air pipes are intended to transport purified compressed air from the compressor to the charge air cooler and then to the throttle fitted on the inlet pipe. For the air cleaner box optimization, through the benchmarking and the innovation ideas from the daily life, two alternative optimized designs were introduced to reduce the cost and weight. The first is four clips connectors and the other is spring clamps. For the hose clamps, another innovation design was introduced to replace the previous hose clamps, which is called friction connector on the inner side of the bellow hose, the outer side of the air cleaner box lid and the clean side duct. For the material of the charge air ducts, TPEE was selected to replace the previous EACM rubber hoses. Further tests and prototypes should be conducted and produced to verify the effect of the optimization.
11
Oh, Seung-Min. "Nonlinear Estimation for Vision-Based Air-to-Air Tracking." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19882.
Full textAbstract:
Unmanned aerial vehicles (UAV's) have been the focus of significant research interest in both military and commercial areas since they have a variety of practical applications including reconnaissance, surveillance, target acquisition, search and rescue, patrolling, real-time monitoring, and mapping, to name a few. To increase the autonomy and the capability of these UAV's and thus to reduce the workload of human operators, typical autonomous UAV's are usually equipped with both a navigation system and a tracking system. The navigation system provides high-rate ownship states (typically ownship inertial position, inertial velocity, and attitude) that are directly used in the autopilot system, and the tracking system provides low-rate target tracking states (typically target relative position and velocity with respect to the ownship). Target states in the global frame can be obtained by adding the ownship states and the target tracking states. The data estimated from this combination of the navigation system and the tracking system provide key information for the design of most UAV guidance laws, control command generation, trajectory generation, and path planning.
As a baseline system that estimates ownship states, an integrated navigation system is designed by using an extended Kalman filter (EKF) with sequential measurement updates. In order to effectively fuse various sources of aiding sensor information, the sequential measurement update algorithm is introduced in the design of the integrated navigation system with the objective of being implemented in low-cost autonomous UAV's. Since estimated state accuracy using a low-cost, MEMS-based IMU degrades with time, several absolute (low update rate but bounded error in time) sensors, including the GPS receiver, the magnetometer, and the altimeter, can compensate for time-degrading errors. In this work, the sequential measurement update algorithm in smaller vectors and matrices is capable of providing a convenient framework for fusing the many sources of information in the design of integrated navigation systems. In this framework, several aiding sensor measurements with different size and update rates are easily fused with basic high-rate IMU processing.
In order to provide a new mechanism that estimates ownship states, a new nonlinear filtering framework, called the unscented Kalman filter (UKF) with sequential measurement updates, is developed and applied to the design of a new integrated navigation system. The UKF is known to be more accurate and convenient to use with a slightly higher computational cost. This filter provides at least second-order accuracy by approximating Gaussian distributions rather than arbitrary nonlinear functions. This is compared to the first-order accuracy of the well-known EKF based on linearization. In addition, the step of computing the often troublesome Jacobian matrices, always required in the design of an integrated navigation system using the EKF, is eliminated. Furthermore, by employing the concept of sequential measurement updates in the UKF, we can add the advantages of sequential measurement update strategy such as easy compensation of sensor latency, easy fusion of multi-sensors, and easy addition and subtraction of new sensors while maintaining those of the standard UKF such as accurate estimation and removal of Jacobian matrices. Simulation results show better performance of the UKF-based navigation system than the EKF-based system since the UKF-based system is more robust to initial accelerometer and rate gyro biases and more accurate in terms of reducing transient peaks and steady-state errors in ownship state estimation.
In order to estimate target tracking states or target kinematics, a new vision-based tracking system is designed by using a UKF in the scenario of three-dimensional air-to-air tracking. The tracking system can estimate not only the target tracking states but also several target characteristics including target size and acceleration. By introducing the UKF, the new vision-based tracking system presents good estimation performance by overcoming the highly nonlinear characteristics of the problem with a relatively simplified formulation. Moreover, the computational step of messy Jacobian matrices involved in the target acceleration dynamics and angular measurements is removed.
A new particle filtering framework, called an extended marginalized particle filter (EMPF), is developed and applied to the design of a new vision-based tracking system. In this work, only three position components with vision measurements are solved in particle filtering part by applying Rao-Blackwellization or marginalization approach, and the other dynamics, including the target nonlinear acceleration model, with Gaussian noise are effectively handled by using the UKF. Since vision information can be better represented by probabilistic measurements and the EMPF framework can be easily extended to handle this type of measurements, better performance in estimating target tracking states will be achieved by directly incorporating non-Gaussian, probabilistic vision information as the measurement inputs to the vision-based tracking system in the EMPF framework.
12
Amissah, Patrick Ken. "Indoor air quality : combining air humidity with construction moisture." Thesis, University of Strathclyde, 2005. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21574.
Full textAbstract:
The project aims to improve the modelling of moisture transfers at internal surfaces by linking the finite volumes representing the Heat, Air and Moisture (HAM) and Computational Fluid Dynamics (CFD) domains. Conflation of both models facilitates the detailed study of moisture flow as it impacts on indoor air quality and occupant health. The thesis lays down the conceptual framework for the subsequent development of an indoor air quality analytical tool. The work thus improves the modelling of construction feature risk assessment, for example, moisture absorption and desorption at the internal fabric surfaces in as much as it relates to indoor air quality. Through such an improvement, an indoor air quality analytical tool for the prediction of time-varying temperature/humidity conditions at specific locations within the building is enabled and subsequently these conditions may be related to the likely occurrence of mould. Humidity in indoor spaces is one of the most important factors in the determination of indoor air quality. High indoor humidity is a major contributor to the accumulation of moisture in the building envelope. This often results in dampness within the building envelope and subsequent health-related problems for the occcupants. Moderation of the indoor relative humidity, temperature and moisture content of the indoor air amongst others is a pre-requisite for a healthy building because it affects the perception of indoor air quality, thermal comfort, occupant health (asthma, respiratory illness, etc), building durability, material emission and energy consumption. Excessively high relative humidity promotes the growth of moulds and mildew on building surfaces. The basis for the envisaged conflation evolves around the boundary layer theory as it pertains to the velocity, thermal and concentration profiles associated with flow parallel to a flat surface, a phenomenon which is recognised as being similar in nature to buoyancy-driven convective heat transfer within building enclosures (White 1988). Within the framework of modelling of indoor air flows, the conflated modelling approach is very much dependent upon the treatment of the internal surface convection, for example, in the conflation of HAM and CFO models. This is referred to as the pivot point for the handshaking between HAM and CFO modelling domains. Within the framework of this project, the pivot point refers to the treatment of surface convection mass transfer at the internal surface to facilitate the hand shaking between HAM and CFO modelling domains. The two-time step coupling approach based on the loose coupling algorithm is adapted for the conflation. The technique involves a process whereby the HAM and CFO models are processed independently but exchange information at the interface at every time-step. The numerical method for the solution of the Navier-Stokes equations is based on the co-located grid arrangement, whereby all flow variables are defined in the centre of the grid cells. The transport equations are integrated for each grid cell and the Gauss Theorem applied to yield an integral over the cell face. These cell face integrals are then approximated using interpolation of the cell centred data. For the resolution of flow in the near-wall regime, the Low-Reynolds number k-ε turbulence model is used. A configuration mechanism with a rules-based moisture control algorithm to facilitate the handshaking of the HAM and CFO domains is presented. Methods for the solution of problems due to moisture migration across the interface, which are effected through variation of the convective mass transfer coefficient, hm, through variation of the standard k-ε turbulence model, namely the lowReynolds number model with its embedded wall damping functions and through adjustment of the source terms of governing transport equations of the CFO and HAM models are also discussed.
13
鄧慶輝 and Hing-fai Tang. "Breathe the air in Hong Kong air quality sustainability." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B31255310.
Full text
14
Matune, Nicholas J. "Fouling of Air Cooled Condensers On the Air Side." Youngstown State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1338509830.
Full text
15
Bhandari, Ujjar. "Control system design for autonomous air-to-air refuelling." Thesis, University of Bristol, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.680354.
Full textAbstract:
A wide range of Unmanned Air Vehicle applications have been identified over the last decade, both for civilian and military usage. The Air-to-Air Refuelling capability is perceived as an advantage to future support and deployment of mid-large scale Unmanned Air Vehicles to meet operational requirements. Despite Autonomous Air-to-Air Refuelling drawing a lot of attention and research in general, bow wave effects in an Air-to-Air Refuelling scenario have received little attention. Some existing studies have discussed and attempted to model the effect of the bow wave from a comparatively large receiver (B-2, C-17) onto the tanker (KC-135) during boom refuelling. However the effects of bow wave from the receiver aircraft onto the drogue in a probe and drogue refuelling system have received very little attention. This thesis analyses the effects of the receiver's bow wave on the drogue in a probe and drogue based Air-to-Air Refuelling activity, with results suggesting its critical influence on the capture rates of Autonomous Airto- Air Refuelling simulation. This work has developed a state of the art literature survey of Air-to-Air Refuelling including the developments in the sensor models, numerical modelling concepts, control methodologies and simulation and test facilities. By performing multiple random simulations a novel way of quantifying capture rates in aerial refuelling simulations has been developed. Compensating the bow wave effects through the use of position offset is simple yet effective solution emerging from this work. This method was found to restore the loss in performance in the Autonomous Air-to-Air Refuelling simulation which results from the bow wave interactions. On the other hand, the ability to optimise these position offsets for a given condition makes it suitably applicable to different flight conditions. Another major contribution is the various capture strategies presented in this thesis which demonstrate several ways of approaching the drogue in the capture phase for successful engagements. Results demonstrate further gains in terms of capture rates by avoiding drogue chasing in the simulations. Additional unconventional and innovative concepts to drogue capture are also discussed. This work forms part of the Autonomous Systems Technology Related Airborne Evaluation & Assessment programme in the UK.
16
Tang, Hing-fai. "Breathe the air in Hong Kong air quality sustainability /." Hong Kong : University of Hong Kong, 2002. http://sunzi.lib.hku.hk/hkuto/record.jsp?B25700698.
Full text
17
Martin, Jerome Vernon. "Reforging the sword : United States Air Force tactical air forces, air power doctrine, and national security policy /." The Ohio State University, 1988. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487596807823823.
Full text
18
Al-Hajri, Ghanem Mohamed. "The impact of sea-air mode on air cargo transport." Thesis, Cranfield University, 1997. http://hdl.handle.net/1826/3259.
Full textAbstract:
The following research looks into the concept of sea-air
intermodality, a combination of two or more modes of
transport for the carriage of goods from origin to
destination. The study examines why and how this form of
transport evolved to become a viable alternative to the
conventional single modes of ocean and air transport.
The viability of the sea-air mode depends on various
equally important factors which are analysed in depth, with
a special emphasis on the sea-air transfer port. fn this
context, research findings of the world's existing sea-air
hubs are recorded and evaluated in terms of their present
and future trends.
At a sea-air transfer hub, ocean cargo is converted to direct
air freight, thus adding new volumes of air cargoes. In this
respect, sea-air plays a positive role in the present and
future development of the air freight industry.
The impact of the sea-air mode can be most clearly seen in
the case study analysis in Chapter 10 of this thesis,
whereby the potential for 'convertibility' of large portions
of low density ocean cargoes to the sea-aix mode, is
successfully demonstrated.
19
Alhoudail, Mamdouh Ali. "Air carrier liability : unfinished unification of private international air law." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=98601.
Full textAbstract:
On 31 November 2003 the 1999 Montreal Convention for the Unification of Certain Rules for International Carriage by Air entered into force. Its purpose was to consolidate and modernize the Warsaw system and to reunify the provisions of several international instruments of private international air law under one legal instrument. The Montreal Convention consolidates the positive elements of the Warsaw Convention, the Hague Protocol, the Guadalajara Convention, the Guatemala City Protocol and Additional Protocol Numbers 3 and 4. It also simplifies and modernizes the requirements of documentation relating to the carriage by air of passengers, baggage and cargo. Most importantly, the Montreal Convention modernizes of the liability regime for death and injury to passengers by adopting the passenger liability regime in the IATA Inter-carrier Agreement. It also modernizes the liability regime for damage to baggage and cargo and the delay. In spite of the foregoing, the Montreal Convention fails to advance the unification of private international air law any further than the Warsaw Convention.This thesis analyzes the provisions of liability regimes under the Warsaw System and the 1999 Montreal Convention. Chapter one studies the liability regime established under the original Warsaw Convention and the subsequent attempts by states, air carriers and other interested entities to update it. Chapter two analyzes the new regime of unlimited liability established by the 1999 Montreal Convention. Chapter three examines the liability of the air carrier for damage caused by terrorist activities. In an effort to demonstrate the innovative elements of the new Convention and to encourage states to ratify it, chapter four surveys the main benefits that have accrued to the Kingdom of Saudi Arabia and its national air carrier upon ratification of the 1999 Montreal Convention.
20
Loewenstein, Andreas. "European air transport within the international system of air regulation." Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=60432.
Full textAbstract:
The International System of Air Transport Regulation, consisting of ICAO's essentially technical regulation, IATA's tariff and services coordination functions and the dense network of Bilateral Agreements might be challenged and profoundly modified by recent developments in the law of the European Communities.In the framework of the creation of the European Internal Market, to be achieved before 1993, the European civil aviation industry is submitted to an accelerated integration and liberalization process. It comprises the opening of national markets to all Community carriers, the application of a common competition regime to all EEC-related flights and the transfer of regulatory functions to the EEC institutions. The EEC might, at the end of this process, acquire exclusive competences for the regulation of interior and exterior aviation matters.
The structure of the International System of Air Transport Regulation and the European air law in place and in the planning stage have to be analyzed with the aim of exploring the compatibility of the European Integrated Air Market with global legal requirements. Where the International system as well as the EEC legal order show imbalances or come into conflict potential solutions are studied.
21
Venter, Jeanne Marie. "Autonomous air-to-air refueling : a comparison of control strategies." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/20239.
Full textAbstract:
Thesis (MScEng)--Stellenbosch University, 2012.ENGLISH ABSTRACT: The air-to-air refuelling of large aircraft presents challenges such as a long fuel transfer time, slow aircraft responses and a large distance between the aircraft CG and the receptacle position. This project addresses some of these issues by adding a control system to keep the receiver aircraft in the correct position relative to the tanker to enable fuel transfer. This project investigates different control strategies which are designed to control the A330-300 during refuelling at one trim condition. The controllers are based on a mathematical aircraft model which was derived from a simulation model received from Airbus. The first set of controllers uses the aircraft actuators directly. Controllers that are based on the CG dynamics and the receptacle dynamics are compared. Due to the large distance between the CG and the receptacle it was found to be essential to control the receptacle position, and not only the CG position. Also, a controller that is based on a model of the receptacle dynamics performs better. The second set of controllers uses the aircraft manual control laws as an inner loop controller. This set of controllers and the last direct actuator controller use the same axial controller that uses the engine thrust to control axial position. It was found that both the direct actuator controller and the manual control laws controller are able to keep the receptacle within the disconnect envelope in moderate turbulence. In both sets of controllers the axial controller fails to keep the receptacle reliably within the disconnect envelope in light turbulence. From the results it is concluded that both the direct actuator control and manual control laws can be used to successfully control the receptacle position in the normal and lateral positions as long as the receptacle kinematics are included in the control design. Using only the engine thrust for axial control is insufficient. Several recommendations are made to improve the axial control and also how these results can be used in future work.
AFRIKAANSE OPSOMMING: Die lug-tot-lug brandstof hervulling van groot vliegtuie het uitdagings soos ’n lang hervullingstyd, stadige vliegtuig dinamika en ’n groot afstand tussen die hervullingspoort en die vliegtuig massamiddelpunt. Hierdie projek spreek sommige van hierdie uitdagings aan deur ’n beheerstelsel by te voeg wat die vliegtuig in die korrekte posisie relatief tot die tenker hou vir brandstofoordrag om plaas te vind. Hierdie projek ondersoek verskillende beheerstrategieë wat ontwerp is om die A330- 300 te beheer by ’n enkele gestadigde toestand. Die beheerders is gebaseer op ’n wiskundige vliegtuigmodel wat vanaf ’n simulasiemodel afgelei is. Die simulasiemodel is vanaf Airbus verkry. Die eerste stel beheerders beheer direk die vliegtuig se beheeroppervlakke. Beheerders wat onderskeidelik die massamiddelpunt en die hervullingspoort beheer word vergelyk. Daar is gevind dat dit essensieel is om die hervullingspoort te beheer en nie slegs die massamiddelpunt nie, as gevolg van die groot afstand tussen hierdie twee punte. Die tweede stel beheerders gebruik die vliegtuig se eie beheerwette as ’n binnelusbeheerder en vorm self die buitelus. Albei stelle beheerders gebruik dieselfde aksiale beheerder wat enjin stukrag gebruik om die aksiale posisie te beheer. Daar is gevind dat beide stelle beheerders die hervullingspoort binne die ontkoppelingsbestek kan hou in die normale en laterale rigtings tydens matige turbulensie. In beide stelle beheerders is dit die aksiale beheerder wat faal om die hervullingspoort betroubaar in posisie te hou, selfs in ligte turbulensie. Vanaf die resultate word afgelei dat beide die direkte beheerder en die buitelusbeheerder gepas is om die laterale en normale posisiebeheer toe te pas mits die dinamika van die hervullingspoort in ag geneem word. Om slegs stukrag te gebruik vir aksiale beheer is nie voldoende nie, en verskeie voorstelle word gemaak om die aksiale beheer te verbeter in toekomstige navorsing.
22
Underberg, Heidi Lee. "Indoor/ambient residential air toxics results in rural western Montana." Diss., [Missoula, Mont.] : The University of Montana, 2009. http://etd.lib.umt.edu/theses/available/etd-08072009-194333.
Full text
23
Varadarajan, Charanya. "Explore the link of PM₁₀ with meteorological factors and ambient air concentrations of ozone, CO and NO₂ using time series for Cleveland, Ohio /." See Full Text at OhioLINK ETD Center (Requires Adobe Acrobat Reader for viewing), 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=toledo1083771115.
Full textAbstract:
Thesis (M.S.V.)--University of Toledo, 2004.Typescript. "A thesis [submitted] as partial fulfillment of the requirements of the Master of Science degree in Civil Engineering." Includes bibliographical references (leaves 83-87).
24
Tångne, Gustaf, and Olof Eliasson. "Projekt Air Control." Thesis, Halmstad University, School of Business and Engineering (SET), 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-1693.
Full text
25
Madani, Jamal Hamzah. "Extensive air showers." Thesis, Durham University, 1987. http://etheses.dur.ac.uk/6877/.
Full textAbstract:
A computerised 8-channel data acquisition unit constructed by the Durham University Microprocessor Unit is described and the calibration of this unit is given in chapter 2. A test for the data acquisition unit using a Geiger-Mul1er cosmic ray telescope is described in Chapter 3. In Chapter 4 the main experiment is described. Two plastic scintillation counters each of 0.4 area and 5cm thick in coincidence were used in this experiment to measure the density spectrum of electrons at sea level in the range 20 - 600 electrons per m(^2). The microcomputer data acquisition system is employed to record the scintillator pulse heights. The measured integral density spectrum has been used to calculate the integral size spectrum at sea level. A brief description of the theory of electron-photon cascades and the formation of extensive are showers is give in Chapter 5.A FORTRAN program which uses Monte Carlo method to simulate extensive air showers generated by high energy protons with a given energy is described in Chapter 6. Using the relation between primary energy and average number of electrons arriving at sea level found by Monte Carlo calculation in Chapter 6 an estimate has been made of the integral primary energy spectrum in the range lO(^14)-lQ(^16)eV, and the result is given in Chapter 7.
26
Lee, Kevin Young. "Bos > AIR." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/87143.
Full textAbstract:
Thesis: M. Arch., Massachusetts Institute of Technology, Department of Architecture, 2014.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (page 127).
The advent of air travel has produced a building typology completely new to the 20th century. The outdated planning of regions for airports render most existing airports as isolated, autonomous instances in the urban environment barricaded by impenetrable walls of highway infrastructure. The current trend sees a steady rise in air travel at Boston's Logan Airport at a time when, globally, new airports are being planned as new airport city typologies which are becoming increasingly complex programmatically. Furthermore, the different modes of accessing the airport along with the various types of sequencing that occurs throughout the process of air travel creates moments of transitions and intersections of narratives and programs. Dziga Vertov's film Man with a Movie Camera and Jacques Tati's Playtime, though cinematically disparate in technique, both commented on the status of entering a new urban modality and experience during their respective times. The project situates itself in that the urban experience in the 21st century resides in that of the airport, where Marc Augé describes as a "non-place," and a product of "Supermodernity." This thesis looks at rethinking the role of the airport terminal at three scales - the urban potential of a new airport city configuration that can increase the value and promote the growth of East Boston, the typological rethinking of relationships between the disparate airport programs and the infrastructure that supports it, and finally, the influence of cinematic techniques for designing through framed views and the scope of vision. It seeks to blur the thresholds between the public edge of the city and the secure site of the airfield - physically, virtually, visually.
by Kevin Young Lee.
M. Arch.
27
Sepúlveda, Vigué Nayadeth, and Castro José Ricardo Ibarra. "Air Nail Manicure." Tesis, Universidad de Chile, 2016. http://repositorio.uchile.cl/handle/2250/143292.
Full textAbstract:
TESIS PARA OPTAR AL GRADO DE MAGÍSTER EN ADMINISTRACIÓN
Nayadeth Sepúlveda Vigué [Parte I], José Ricardo Ibarra Castro [Parte II]Actualmente ha habido un incremento en la oferta de vuelos, ya sea por menores precios o por mayor oferta de líneas aéreas. Y junto con esto, también se puede observar que los pasajeros cuentan con un tiempo de espera ocioso antes de abordar su vuelo, el cual pueden utilizar de varias maneras. Pero en el Aeropuerto de Santiago no está presente la oferta de un servicio de Manicure, que es la esencia de este negocio, denominado Air Nails. Las razones del por qué se ha elegido realizar este emprendimiento se fundamentan en lo siguiente: El servicio de Manicure constituye un negocio innovador, único, ya que actualmente no hay competidores directos, y distintivo en el Aeropuerto de Santiago de Chile. El volumen de pasajeros anuales del Aeropuerto, que actualmente alcanza 18 millones y que se espera que para su ampliación al 2020 esta cifra crezca a 30 millones al año. La principal ventaja competitiva y comparativa de Air Nails es que se tiene el permiso para operar y “La Exclusividad” en el aeropuerto, por lo menos hasta los cinco primeros años de duración del contrato. Considerando la evaluación financiera, se puede ver que es un negocio rentable y atractivo, dadas las condiciones de la industria, la baja penetración del mercado, el bajo nivel de riesgo y los flujos futuros estimados: El monto de inversión inicial de $84.915.405 es razonable y aportado en su totalidad por los socios. La evaluación presenta un VAN positivo de $86.392.717 y un Payback de 3,3 años o 33 meses, considerando que el año 1 solo considera 5 meses. El EBITDA a partir del segundo año de operación es de $35.999.943, y supera el resultado negativo del año 1, que sólo considera 5 meses de operación. Los siguientes años, este valor va en aumento sostenido.
28
Smith, Ann Braley. "The sweet air." [Boise, Idaho] : Boise State University, 2009. http://scholarworks.boisestate.edu/td/13/.
Full text
29
Clemente, Jerez Ana María Paulina, and Quezada Alexis Osvaldo Arellano. "Clean Air Systems." Tesis, Universidad de Chile, 2018. http://repositorio.uchile.cl/handle/2250/164093.
Full textAbstract:
TESIS PARA OPTAR AL GRADO DE MAGÍSTER EN ADMINISTRACIÓNClemente Jerez, Ana María Paulina, [Parte I], Arellano Quezada, Alexis Osvaldo, [Parte II]
El gasto energético de un Edificio en Chile fluctúa entre el 40% y el 65% del gasto total. “Clean Air Systems”, gracias a su producto Steril-aire permite reducir costos energéticos entre un 10% a 30% del consumo de climatización; además de la reducción en consumo de agua, costos de mantenimiento, mejoras de eficiencia operativa, y otros beneficios a través de eficiencias complementarias. El servicio está dirigido a distintos equipos de distintos clientes, determinado por los requerimientos específicos de cada uno de ellos. El mercado lo constituyen las edificaciones con equipamiento de climatización. El Mercado Actual de Oficinas en el año 2017 posee un tamaño de 3.898.865 metros cuadrados, con un crecimiento promedio para edificaciones de tipo sustentable y no sustentable del 7% anual (mercado potencial). El Mercado Potencial se estima en el 69% compuesto por Edificios clase A, B y C. El EBITDA varía entre el 13,63% y el 23,95% al año 5. Las Utilidades siempre positivas se mantiene relativamente constantes, fluctuando entre los $53.538.397, y $140.624.457 en el quinto año. El Flujo de Caja nos indica que el monto de la inversión inicial es de $150.000.000; y los flujos de $91.215.208 año 1, $117.043.243 año 2, $123.374.736 año 3, $152.867.622 año 4, y de $196.938.154 año 5. Obteniendo un VAN (25%) de $150.555.983.-; y una TIR de 70,70%. El plan de negocios en la comercialización del servicio para el cliente trae muchos beneficios, Steril-Aire es una tecnología limpia, libre de químicos, sustentable, y que sólo utiliza el oxígeno; abarcando problemas como la calidad del aire, costos energéticos, y sanitarios. Las Estrategias a utilizar son básicamente dos: Estrategia para Proyectos No Sustentables y para Proyectos Sustentables. En la última diferenciamos Estrategia de Eficiencia Energética. Estas estrategias no son excluyentes, sino que tienen un énfasis distinto en cada segmento. El Green Marketing se utilizará agregando valor de la mano de la conciencia empresarial. La publicidad dirigida a empresas que busquen transformarse en empresas verdes o acercarse a una mayor sustentabilidad, serán actividades a implementar aprovechando este segmento de clientes preocupados del medio ambiente. Finalmente se muestra una planificación de crecimiento estimada para los próximos 5 años y la propuesta para futuros inversionistas.
30
Warren, Lindsay Elizabeth. "In the air." Thesis, University of Iowa, 2010. https://ir.uiowa.edu/etd/621.
Full text
31
Latorre, del Pedregal Patricio, and Montero Gustavo Adolfo Bopp. "Hot Air Ballooning." Tesis, Universidad de Chile, 2014. http://repositorio.uchile.cl/handle/2250/170420.
Full textAbstract:
TESIS PARA OPTAR AL GRADO DE MAGÍSTER EN ADMINISTRACIÓN (MBA)El presente plan de negocios consiste en la creación de una empresa operadora de turismo, cuya actividad principal serán los paseos en globo aerostático en el desierto de Atacama. Específicamente el modelo apunta a los turistas extranjeros y nacionales con poder adquisitivo medio-alto y con interés por el soft-adventure, ambas características comunes en la zona de San Pedro de Atacama (según Sernatur, el 23% de los turistas que visitan Chile se dirigen a esa zona en particular, y el gasto por región es aproximadamente: Asia $1.650 p/p, Europa $1.200 p/p, América latina $1.000 p/p en 2013). Dentro de los servicios que ofrecerá la empresa operadora se encuentran viajes para hasta 24 personas y customizados a las necesidades de clientes así lo requieran. El punto de equilibrio del proyecto es de 4798 clientes anuales. Mientras que el PIB en Chile creció un 4,1% durante el año 2013, la industria del turismo aventura mundial viene creciendo a un 65% anual desde 2009, por lo que se considera un potencial de crecimiento estimado de esta actividad en la zona de un 7,8% anual, demanda que se basa en el aumento de la cantidad de turistas nacionales y extranjeros (donde europeos, estadounidenses y brasileños forman el grueso de nacionalidades) que visitan la zona. Existe además un medioambiente propicio para la actividad, producto del incremento en inversión hotelera que se está realizando a nivel nacional y especialmente en la zona. En definitiva, el atractivo de la industria es alto, tal y como se verá en el documento. Desde el punto de vista de ventajas que puede contar este modelo para competir en la industria de soft-adventure podemos mencionar el ofrecer un servicio diferenciado e innovador respecto del turismo local que se ofrece en San Pedro de Atacama, además de alianzas estratégicas con las autoridades de la zona así como con cadenas hoteleras. Por otra parte, no existe una competencia directa en la zona que opere de manera permanente. Respecto a los recursos humanos requeridos, se contempla la inclusión de un piloto encargado de las operaciones, un gerente de administración y finanzas, un técnico mecánico aeronáutico y algunos operadores no calificados. Finalmente, las ventas estimadas del negocio son entre 1,3 – 2 millones de dólares anuales, por lo que el negocio requiere de una inversión de KUS$140 que serán aportados por los socios. Basado en las proyecciones de venta en un horizonte de evaluación de 5 años, descontando los flujos de caja para los accionistas a una tasa de 23%, calculada en base al método CAPM, se obtienen los siguientes resultados financieros: Por lo cual se concluye que es recomendable invertir en el proyecto dado los atractivos resultados que este retornaría a los inversionistas.
32
Salvati, Gerardo. "Modernism on Air." Doctoral thesis, Universita degli studi di Salerno, 2016. http://hdl.handle.net/10556/2460.
Full textAbstract:
2014 - 2015La tesi di dottorato, intitolata “Modernism on Air” si articola in quattro capitoli, preceduti da un’introduzione in cui si dà conto di quello che gli studiosi hanno definito il Great Divide nei rapporti tra Modernismo e cultura di massa. Nel primo capitolo, vengono presentate le principali teorie che sostengono l’impossibilità di trovare un punto di raccordo tra Modernismo e cultura di massa. Nello specifico vengono analizzate le teorie di Huyssen che afferma l’esistenza di un ‘unbridgeable’ gap tra i suddetti movimenti culturali. Viene dato spazio anche all’analisi del pensiero di quei pensatori, Walter Benjamin e Theodor Adorno su tutti, che sono alla base della teorizzazione della divisione dicotomica tra Modernismo e cultura di massa. Vengono poi presi in esame gli studi sul Modernismo dell’ultimo decennio che, invece, danno di quest’ultimo una lettura più democratica e collaborazionista con la cultura di massa. La seconda parte del presente lavoro descrive, invece, i punti di contatto che importanti esponenti del Modernismo hanno avuto con la cultura di massa attraverso la collaborazione con riviste di moda ed emittenti radiofoniche. Sono stati oggetto di analisi gli articoli che Virginia Woolf scrisse per Vogue e le trasmissioni radiofoniche che tenne per conto della BBC. La terza parte della ricerca ha invece preso in analisi i possibili effetti della radio sulla parola scritta. Partendo dal concetto di crisi della tradizione oculocentrica, che basava sul senso della vista il metodo principale di conoscenza, vengono presi in esame una serie di estratti dei romanzi di James Joyce e Virginia Woolf per dimostrare come gli artisti modernisti depotenziano la vista in favore dell’udito nella narrazione della realtà. In tal modo la percezione come modalità conoscitiva non viene più solo affidata all’occhio ma anche e soprattutto all’udito. L’ultima parte si concentra sull’inglobamento volontario della radio nell’opera d’arte attraverso l’analisi dei testi di Samuel Beckett e Dylan Thomas. A differenza del passato, il testo non viene più pensato prima per la pagina scritta e poi ‘adattato’ per la radio ma quest’ultima diventa da subito la matrice principale che da forma e sostanza al testo. Ne emerge, in tal modo, un nuovo tipo di testo i cui personaggi hanno una forte valenza ‘radiofonica’ per come sono creati e per come agiscono. [a cura dell'autore]
The thesis is entitled “Modernism on Air” and is structured into four chapters, preceded by an introduction, which focuses on the notion of The Great Divide between Modernism and mass culture. The first chapter analyses the main theories which claim there is no connection between Modernism and mass culture. Specifically, it is taken into account Huyssen’s thought that affirms the existence of an ‘unbridgeable gap’ between the above-mentioned movements. Moreover, Walter Benjamin’s and Theodor Adorno’s theories, that form the basis of the dichotomy between Modernism and mass culture, have been object of investigation. In addition, the Modernist studies of the last decade, that claim Modernism was not an elitist movement, have been investigated. The second chapter of the present work describes the intersections between Modernism and mass culture by fashion magazines and radio stations. Virginia Woolf’s contributions to Vogue and the BBC have been analysed. The third part of the research pays attention to the effects of radio and sound on the written word. Starting from the notion of ocularcentrism, that considered the eye the main tool to know the world, and its subsequent crisis, several excerpts from Joyce’s and Woolf’s novels have been examined in detail in order to demonstrate that Modernists disempowered vision in favour of hearing. In this way perception, as a knowing mode of the world, is not provided exclusively by the eye but also by the ear. The last chapter is devoted to the intentional incorporation of radio into the work of art. Samuel Beckett’s and Dylan Thomas’ radio texts have been studied. Unlike in the past, a text is no more thought for the page and then adapted to radio but the latter becomes the matrix that gives form and substance to the text. In this way a new kind of artistic work is created in which its characters have a strong ‘radiophonic’ valence because of the way they are brought into existence and act. [edited by author]
XIV n.s.
33
Tong, Wai-fong. "A study of suspended airborne particulates monitoring in Hong Kong /." Hong Kong : University of Hong Kong, 1997. http://sunzi.lib.hku.hk/hkuto/record.jsp?B1873442X.
Full text
34
Cheung, Ho-kwong. "Apportionment of air particulate sources in Hong Kong : development of sampling and analytical methods for the determination of organic and inorganic compounds /." Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B18037616.
Full text
35
Montgomery, James. "Air filtration : predicting and improving indoor air quality and energy performance." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/54074.
Full textAbstract:
Air filtration is used to reduce particle concentrations in the indoor environment to provide improved occupant health due to reduced exposure. Increased focus on occupant health in emerging design standards is leading to the installation of higher efficiency filtration systems. These systems generally have higher resistance to flow and therefore impose a greater energy penalty. Previous air filter models have used simplified assumptions with regards to the dynamics of filter operation, which have limited the potential to determine energy efficiency or optimization approaches to system design and operation. This dissertation focuses on developing an improved air filter model to investigate the potential for system modifications to reduce energy consumption and improve indoor air quality (IAQ) within commercial buildings.
A new air filter performance model was developed using generalizable results from ASHRAE Standard 52.2-2012 and validated against laboratory and real-world experiments. The results showed better agreement with laboratory tests than with real operation. The filter model was combined with existing indoor particle dynamics and epidemiological models to determine the impacts of changes to system operation through monetization of operation costs and health benefits. Laboratory experiments were performed to evaluate the role that particle properties and relative humidity play in determining the filter performance changes with the aim of better understanding the reasons for discrepancies in operation between laboratory and field filter tests.
Operation can now be optimized by accounting for dynamic characteristics of filter performance. Benefits of improved filtration efficiency were found to outweigh added costs. Adopting specific indoor particle concentration limits is recommended to replace existing specifications relying on filter efficiency. System designs can then be optimized to account for local particle concentration and energy costs. A number of system design changes have been highlighted that allow for simultaneous reduction in operation cost and indoor particle concentrations. Relative humidity has been identified as a critical parameter in filter performance and standardized tests should be modified to account for variability in relative humidity and particle characteristics typical of real operation to allow for improvements to future model predictions. Supplementary materials: http://hdl.handle.net/2429/54056Applied Science, Faculty of
Mechanical Engineering, Department of
Graduate
36
Bernauw, Kristiaan C. A. "The legal aspects of international air courier and air express services /." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66039.
Full text
37
江顯其 and Hin-kee Kong. "Air pollution impacts as indicated by roadside air quality monitoring stations." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B3125424X.
Full text
38
Shutty, Michael Allen. "Dynamic modeling and modal analysis of an air-to-air missile." Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/25858.
Full textAbstract:
Approved for public release; distribution is unlimited.The P-3 Orion patrol airplane has a need for air-to-air missile system for defense against enemy aircraft on its long-range missions. In response to this need, the Naval Air Test Center was tasked in 1989 to conduct a P-3/AIM-9 (Sidewinder) integration program. In support of this program, a vibration test stand was established at NPS, and a ground vibration characterization was conducted to determine if a potential flutter problem existed..
39
Williams, Matthew J. "Control of air-intake lip separation using air-jet vortex generators." Thesis, City University London, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419005.
Full text
40
Paonessa, Michael E. (Michael Edward) 1979. "A model for predicting air flow during in-situ air sparging." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/85753.
Full text
41
Wicoff, Paul. "Application and design of air-to-air variable refrigerant flow systems." Kansas State University, 2010. http://hdl.handle.net/2097/6816.
Full textAbstract:
Master of ScienceDepartment of Architectural Engineering and Construction Science
Julia A. Keen
This report addresses the operation, use, and design of air-to-air variable refrigerant flow systems, also known as VRF. Relatively new to the United States, these HVAC systems have potential to reduce energy consumption and utility costs in the correct applications. Although useful in many applications, the best building types for VRF are those requiring a large number of zones and with low ventilation air requirements. The report explains design and system selection considerations and accordingly presents two flowcharts to help designers implement this system. To show how the system compares to traditional technologies in terms of efficiency and cost, the report presents results from several studies comparing VRF to other systems. In addition, an energy modeling study is conducted to clarify the effect of climate on the system; this study established air-to-air VRF as having highest energy consumption in dry, southern climates, based on energy use and operating costs. With this report, HVAC designers can learn when air-to-air VRF is an acceptable method for providing heating and cooling in a building.
42
Plecity, Mark S. "AIRBORNE TELEMETRY AND THE ADVANCED MEDIUM RANGE AIR-TO-AIR MISSILE." International Foundation for Telemetering, 1986. http://hdl.handle.net/10150/615399.
Full textAbstract:
International Telemetering Conference Proceedings / October 13-16, 1986 / Riviera Hotel, Las Vegas, NevadaThe Advanced Range Instrumentation Aircraft (ARIA) is an airborne platform to receive, record, process and retransmit telemetry data. This paper presents a summary of ARIA’s capabilities with emphasis on airborne testing of the Advanced Medium Range Air to Air Missile (AMRAAM) program. The unique test scenarios, as well as current and future telemetry requirements of the AMRAAM test program are discussed.
43
Casillas-Ituarte, Nadia Ninel. "Spectroscopic Studies of Atmospheric Relevant Air-Aqueous and Air-Silica Interfaces." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1268155570.
Full text
44
Daggenfelt, Gustav. "Layout of spillway aerator air ventsand its effect on air supply." Thesis, KTH, Mekanik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-208990.
Full textAbstract:
Chute aerators are constructed to protect spillways from cavitation damage.They function by launching the water ow as a jet and supplying airunderneath since having air entrained into the water is an eective way tomitigate cavitation. This report looks at Bergeforsen, a dam in northernSweden, and its spillway as a basis for investigating how altering the aerator'soutlet alters its performance. Five dierent designs are tested using CFD with ANSYS Fluent 17. The designs are evaluated with regard to totalair ow, air ow distribution, duct pressure distribution, cavity length, andair concentration in water jet.It was found that designs with more even duct pressure distribution, thattransported air further toward the spillway center, had somewhat reducedtotal air supply compared to designs that released more of its air in theearly part of the duct. Consequently there appear to be a trade o betweeneectively distributing the air and providing more air ow. The currentdesign used by Bergeforsen strikes this balance quite well, better than theother tested designs.Luftinblandare byggs för att skydda utskov från kavitationsskador. De fungerar genom att låta vattenströmmen bli en stråle under vilken luft tillsätts eftersom att blanda in luft i vattenströmmen är ett effektivt sätt att motverka kavitation. Den här rapporten undersöker Bergeforsen, en damm i norra Sverige, och dess utskov för att undersöka hur luftinblandarens utsläpp påverkar dess prestanda. Fem olika designer testas med hjälp av CFD i ANSYS Fluent 17. Designerna utvärderas med avsikt påtotalt luftflöde, fördelning av luftflöde, tryckfördelning i luftgången, längd pålufthålrum, samt luftkoncentration i vattenstrålen. Det upptäcktes att designer med mer jämn tryckfördelning i luftgången, som transporterade mer luft till utskovets mitt, hade något mindre total lufttillförsel jämfört med designer som släppte ut mer av luften tidigare ur luftgången. Det ser därför ut att krävas en kompromiss mellan effektiv fördelning och totalt luft flöde. Den design som används i Bergeforsen idag uppfyller den kompromissen ganska väl, bättre än de andra som testades.
45
Rodriguez-Anderson, Santiago Martin. "Sensible Air to Air Heat Recovery Strategies in a Passive House." PDXScholar, 2015. https://pdxscholar.library.pdx.edu/open_access_etds/2123.
Full textAbstract:
Due to rising energy costs and concerns about global climate change, high performance buildings are more in demand than ever before. With roughly 20% of the total energy consumption in the United States being devoted to residential use, this sector represents a significant opportunity for future savings. There are many guidelines and standards for reducing building energy consumption. One of the most stringent is the Passive House Standard. The standard requires that that air infiltration is less than or equal to 0.6 air changes per hour at a 50 Pascal pressure difference (ACH 50), annual heating energy is less than or equal to 15kWh/m2, and total annual source energy is less than or equal to 120 kWh/m2. For comparison, the typical West coast US residence has an ACH50 of 5 and annually uses more than 174 kWh/m2 of source energy according to the 2009 Residential Energy Consumption Survey. With these challenging requirements, successful implementation of the Passive House Standard requires effective strategies to substantially reduce energy consumption for all end uses.
Heating and cooling loads are low by necessity in a Passive House. As such this makes end uses like water heating a much larger fraction of total energy use than they would be in a typical building. When air to water heat pumps are employed the energy consumption by water heating is lowered significantly. By employing innovative heat recovery strategies the energy consumption for water heating and HVAC can be reduced even further. This study uses energy modeling and project cost analysis to evaluate three innovative control strategies. Results for a Passive House in Portland Oregon show a savings of about $70 annually with a payback period of 10 years. The same Passive House in Fairbanks Alaska with a different strategy would save $150 annually with a payback period of 5 years.
46
Marsik, Tomas. "Developing computer models to study the effect of outdoor air quality on indoor air for the purpose of enhancing indoor air quality." online access from Digital Dissertation Consortium, 2007. http://libweb.cityu.edu.hk/cgi-bin/er/db/ddcdiss.pl?3286622.
Full text
47
Wong, Ming-hong Daniel. "A study of passive sampling and modelling techniques for urban air pollution determination /." Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B2093385X.
Full text
48
Fitzpatrick, John S. "Expeditionary airfield operations laying the foundation for future success /." CLICK HERE TO VIEW:, 2004. https://research.maxwell.af.mil/papers/ay2004/ari/fitzpatrick.pdf.
Full text
49
Chan, Sik-foon Joyce. "Application of cluster analysis to identify sources of particulate matter in Hong Kong /." Hong Kong : University of Hong Kong, 1995. http://sunzi.lib.hku.hk/hkuto/record.jsp?B1470920X.
Full text
50
Gill, Travis J. "Carrier air wing tactics : incorporating the Navy Unmanned Combat Air System (NUCAS)." Thesis, Monterey, California : Naval Postgraduate School, 2010. http://edocs.nps.edu/npspubs/scholarly/theses/2010/Mar/10Mar%5FGill.pdf.
Full textAbstract:
Thesis (M.S. in Operations Research)--Naval Postgraduate School, March 2010.Thesis Advisor(s): Sanchez, Susan M. Second Reader: Otte, Douglas E. "March 2010." Description based on title screen as viewed on April 26, 2010. Author(s) subject terms: Unmanned Combat Air System (UCAS), Carrier Air Wing (CAW), Strike Aircraft, X-47B, Defensive Counter Air (DCA), Aerial Refueling (AF) Remotely Manned Vehicles, Data Farming, MANA, Simulation and Efficient Design Center (SEED). Includes bibliographical references (p. 53-54). Also available in print.