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Academic literature on the topic 'Cooling solutions'

Author: Grafiati
Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Cooling solutions"

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Zobler, Markus, and Eike Mantwill. "Cooling Solutions for Laser Applications." Laser Technik Journal 15, no. 3 (June 2018): 50–55. http://dx.doi.org/10.1002/latj.201800020.

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Tian, S., T. Takken, V. Mahaney, C. Marroquin, M. Schultz, M. Hoffmeyer, Y. Yao, K. Oconnell, A. Yuksel, and P. Coteus. "Summit and Sierra supercomputer cooling solutions." IBM Journal of Research and Development 64, no. 3/4 (May 1, 2020): 5:1–5:12. http://dx.doi.org/10.1147/jrd.2019.2958902.

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Stern, Jonathan, Drummond Fielding, Claude-André Faucher-Giguère, and Eliot Quataert. "Cooling flow solutions for the circumgalactic medium." Monthly Notices of the Royal Astronomical Society 488, no. 2 (July 11, 2019): 2549–72. http://dx.doi.org/10.1093/mnras/stz1859.

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ABSTRACT In several models of galaxy formation feedback occurs in cycles or mainly at high redshift. At times and in regions where feedback heating is ineffective, hot gas in the galaxy halo is expected to form a cooling flow, where the gas advects inward on a cooling timescale. Cooling flow solutions can thus be used as a benchmark for observations and simulations to constrain the timing and extent of feedback heating. Using analytic calculations and idealized 3D hydrodynamic simulations, we show that for a given halo mass and cooling function, steady-state cooling flows form a single-parameter family of solutions, while initially hydrostatic gaseous haloes converge on one of these solutions within a cooling time. The solution is thus fully determined once either the mass inflow rate ${\dot{M}}$ or the total halo gas mass are known. In the Milky Way halo, a cooling flow with ${\dot{M}}$ equal to the star formation rate predicts a ratio of the cooling time to the free-fall time of ∼10, similar to some feedback-regulated models. This solution also correctly predicts observed $\rm{O\,{\small VII}}$ and $\rm{O\,{\small VIII}}$ absorption columns, and the gas density profile implied by $\rm{O\,{\small VII}}$ and $\rm{O\,{\small VIII}}$ emission. These results suggest ongoing heating by feedback may be negligible in the inner Milky-Way halo. Extending similar solutions out to the cooling radius however underpredicts observed $\rm{O\,{\small VI}}$ columns around the Milky-Way and around other low-redshift star-forming galaxies. This can be reconciled with the successes of the cooling flow model with either a mechanism which preferentially heats the $\rm{O\,{\small VI}}$-bearing outer halo, or alternatively if $\rm{O\,{\small VI}}$ traces cool photoionized gas beyond the accretion shock. We also demonstrate that the entropy profiles of some of the most relaxed clusters are reasonably well described by a cooling flow solution.
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Lieberman, Ya L., S. V. Lukinskikh, and D. M. Musina. "IMPROVED REMOVAL FROM THE CUTTING AREA WHEN TURNING WITH AN INTERNAL AIR-COOLED CUTTER." Spravochnik. Inzhenernyi zhurnal, no. 302 (May 2022): 3–9. http://dx.doi.org/10.14489/hb.2022.05.pp.003-009.

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The article studies the influence of design solutions on heat sink when turning with a cutter with internal air-cooling. A cutter design with increased heat sink has been developed. This design allows to significantly expanding the scope of use of cutters with internal air-cooling instead of traditional cutters with coolant.
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Leylek, J. H., and R. D. Zerkle. "Discrete-Jet Film Cooling: A Comparison of Computational Results With Experiments." Journal of Turbomachinery 116, no. 3 (July 1, 1994): 358–68. http://dx.doi.org/10.1115/1.2929422.

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Large-scale computational analyses have been conducted and results compared with experiments to understand coolant jet and crossflow interaction in discrete-jet film cooling. Detailed three-dimensional elliptic Navier–Stokes solutions, with high-order turbuence modeling, are presented for film cooling using a new model enabling simultaneous solution of fully coupled flow in plenum, film-hole, and cross-stream regions. Computations are carried out for the following range of film cooling parameters typically found in gas turbine airfoil applications: single row of jets with a film-hole length-to-diameter ratio of 1.75 and 3.5; blowing ratio from 0.5 up to 2; coolant-to-crossflow density ratio of 2; streamwise injection angle of 35 deg; and pitch-to-diameter ratio of 3. Comparison of computational solutions with experimental data give good agreement. Moreover, the current results complement experiments and support previous interpretations of measured data and flow visualization. The results also explain important aspects of film cooling, such as the development of complex flow within the film-hole in addition to the well-known counterrotating vortex structure in the cross-stream.
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Grosu, Vicentiu, Chris Lindgren, Tamas Vejsz, Ya-Chi Chen, and Avijit Bhunia. "Thermal Management Solutions for Network File Server Used in Avionics Applications." International Symposium on Microelectronics 2014, no. 1 (October 1, 2014): 000419–27. http://dx.doi.org/10.4071/isom-wa24.

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In the modern era of commercial aviation there is an increasing need for establishing on-aircraft networks that interconnect legacy avionics systems for the purpose of data collection, health monitoring, and software management. At the heart of these networks are flightworthy file servers that perform similar functions to servers used in ground-based IT infrastructures. However, the size, weight, and power constraints for airborne servers are significantly more challenging than the constraints placed on groundbased equipment. As a result, the critical goals in the development of aircraft network systems are reducing the size and weight, maximizing the performance and reliability, and reducing cost. One of the main challenges includes dissipating high power in small packages within a confined space. This makes thermal management a critical component of the overall LRU (Line-Replaceable Unit) design. In addition, passive cooling systems are often required in place of internal fans in order to improve long-term reliability of the system. This presents another set of challenges, such as optimizing the airflow provided by the aircraft in the electronics compartment. This paper will present some of the critical elements of thermal management such as heat sinking, component placement, thermal interface materials, thermal vias, thermal links, heat spreader, packaging approaches and cooling strategies. The design and optimization of this system are based on analytical solutions, conjugated heat transfer and experimental results. Thermal management solutions must enable reliable operation under various environmental conditions: ground operation, flight operation, high operating temperature and loss of cooling air. Each environmental condition has different parameters for coolant airflow rate, effect of the surroundings, and ambient and coolant air temperature. Cooling airflow analyses were performed using CFD (Computational Fluid Dynamics). We have identified multiple approaches to remove heat from the critical components through optimization of the components and subsystems. These same approaches also serve to increase the system's performance and reliability.
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Danilov, V. V., V. A. Smirnov, and V. B. Shilov. "Laser cooling of solutions of complex molecules." Journal of Optical Technology 71, no. 2 (February 1, 2004): 123. http://dx.doi.org/10.1364/jot.71.000123.

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Pokhodyaev, S. B., Yu I. Anoshkin, N. G. Pimenkova, and Yu S. Pokhodyaeva. "New design solutions for hybrid cooling towers." Chemistry and Technology of Fuels and Oils 44, no. 4 (July 2008): 235–38. http://dx.doi.org/10.1007/s10553-008-0047-9.

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Garcia, Raycon Roberto Freitas, Ana Carina Nogueira Vasconcelos, Jayme Aparecido Povh, Eneder Rosana Oberst, Lidiane Raquel Eloy, and Danilo Pedro Streit Junior. "Different extenders solutions for tambaqui semen cooling." Pesquisa Agropecuária Brasileira 51, no. 6 (June 2016): 780–84. http://dx.doi.org/10.1590/s0100-204x2016000600011.

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Abstract: The objective of this work was to evaluate the efficiency of extenders solutions in tambaqui (Colossoma macropomum) semen cooling at 6°C. The treatments consisted of semen dilutions with three extenders - BTS, HBSS, and ACP-104 -, and a control with undiluted semen. Cooled semen was evaluated by 24, 48, 72, 96, and 120 hours. There were differences for the duration of motility and fertilization rates among the semen dilutions. Motility duration proved a highly variable evaluation after 72 hours. Dilution testing can be performed by the three products, and cooling storage for 72 hours is most effective with BTS extender.
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El-Masri, M. A. "On Thermodynamics of Gas-Turbine Cycles: Part 2—A Model for Expansion in Cooled Turbines." Journal of Engineering for Gas Turbines and Power 108, no. 1 (January 1, 1986): 151–59. http://dx.doi.org/10.1115/1.3239862.

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While raising turbine inlet temperature improves the efficiency of the gas-turbine cycle, the increasing turbine-cooling losses become a limiting factor. Detailed prediction of those losses is a complex process, thought to be possible only for specific designs and operating conditions. A general, albeit approximate, model is presented to quantify those cooling losses for different types of cooling technologies. It is based upon representing the turbine as an expansion path with continuous, rather than discrete, work extraction. This enables closed-form solutions to be found for the states along the expansion path as well as turbine work output. The formulation shows the key factor in determining the cooling losses is the parameter scaling the ratio of heat to work fluxes loading the machine surfaces. Solutions are given for three cases: internal air-cooling, transpiration air cooling, and internal liquid cooling. The first and second cases represent lower and upper bounds respectively for the performance of film-cooled machines. Irreversibilities arising from flow-path friction, heat transfer, cooling air throttling, and mixing of coolant and mainstream are quantified and compared. Sample calculations for the performance of open and combined cycles with cooled turbines are presented. The dependence and sensitivity of the results to the various loss mechanisms and assumptions is shown. Results in this paper pertain to Brayton-cycle gas turbines with the three types of cooling mentioned. Reheat gas turbines are more sensitive to cooling losses due to the larger number of high-temperature stages. Those are considered in Part 3.
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Dissertations / Theses on the topic "Cooling solutions"

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Khachaturian, Mark Haig 1979. "Solutions to various problems in reversible cooling fMRI studies." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/17030.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 2003.
Includes bibliographical references (p. 40).
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Functional magnetic resonance imaging (fMRI) has been very useful in helping neuroscientists map the brain. One tool to investigate the interactions between brain regions is to disable a small region in the brain, and look at the functional consequences of this (reversible) inactivation upon regions anatomically connected to the inactivated site. A number of issues need to be resolved before the reversible cooling technique can be used in fMRI studies. The solutions to a number of problems directly related to using reversible inactivation by cooling in conjunction with fMRI experiments on monkey brains are presented in this thesis. Specifically, these include (1) designing a cooling system and cooling probe capable of reversibly cooling the surface cortex of the monkey's brain, (2) develop or use an existing method to measure the temperature distribution with the MR-scanner, and (3) design and construct a coil (phase array) that will be used to obtain temperature and fMRI data at the highest resolution possible. A cooling system and coolant probe were designed capable of changing the temperature of the surface cortex from 37 oC to 20 oC. The Proton Resonance Frequency Shift method, which calculates the temperature based on the phase change between two images, was used to measure the temperature distribution inside an object using an fMRI sequence similar to the one that will be used in the actual experiment. The method was tested and showed an accuracy of ± 0.6 oC as compared with concurrent thermocouple measurements when adjusted for phase drift. A precision of ± 0.15 oC was found at a resolution of 2.1 x 2.1 x 1.0 mm3. A phase array head coil was designed with superior imaging qualities to the current single coil. An increase of SNR from 40 to 52 was observed in the image (30% increase) as compared with the theoretical calculated increase of 70%.
by Mark Haig Khachaturian.
S.M.
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Chou, Lu-chien. "Drag reducing cationic surfactant solutions for district heating and cooling systems /." The Ohio State University, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487758178238587.

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Lambert, Océane. "Solutions architecturées par fabrication additive pour refroidissement de parois de chambres de combustion." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAI048/document.

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En vue de leur refroidissement, les parois de chambres de combustion aéronautiques sont perforées de trous à travers lesquels de l’air plus froid est injecté. La paroi est ainsi refroidie par convection et un film isolant est créé en surface chaude (film cooling). Cette thèse a pour objectif d’utiliser les possibilités de la fabrication additive pour proposer de nouvelles solutions architecturées qui permettraient d’augmenter les échanges de chaleur internes et d’obtenir ainsi de meilleures efficacités de refroidissement.La première approche consiste à élaborer de nouveaux designs de plaques multiperforées par Electron Beam Melting (EBM) et Selective Laser Melting (SLM) aux limites de résolution des procédés. Les architectures sont caractérisées en microscopie, en tomographie X et en perméabilité. Des simulations aérothermiques permettent de mettre en évidence l’effet de ces nouveaux designs sur l’écoulement et les échanges de chaleur, et de proposer des voies d’amélioration de la géométrie.La deuxième approche consiste à élaborer de façon simultanée une pièce architecturée par EBM, avec des zones denses et poreuses. A partir d’analyse d’images associée à une cartographie EBSD grand champ, il est possible de remonter aux mécanismes de formation du matériau poreux et de relier la perméabilité et la porosité aux paramètres procédé. Afin de favoriser le film cooling, il pourrait être avantageux que les zones microporeuses soient orientées dans le sens de l’écoulement. Pour ce faire, un nouveau procédé dénommé Magnetic Freezing, où des poudres métalliques forment une structure orientée par un champ magnétique, est mis au point.Les diverses solutions développées durant cette thèse sont testées sur un banc aérothermique. Les essais montrent qu’elles offrent un refroidissement plus efficace et plus homogène que la référence industrielle. Enfin, de premiers tests en combustion sur l’une des structures retenues, plus légère et plus perméable que la référence, montrent qu’il s’agit d’une solution aussi efficace à un débit traversant donné, et donc a priori plus efficace à une surpression donnée
Combustion chamber walls are perforated with holes so that a cooling air flow can be injected through them. The wall is cooled by convection and an insulating film is created on the hot surface (film cooling). This PhD thesis aims to use the possibilities of additive manufacturing to provide new architectured solutions that could enhance the internal heat exchanges, and lead to a higher cooling effectiveness.The first approach is to develop new designs of multiperforated walls by Electron Beam Melting (EBM) and Selective Laser Melting (SLM) used at the resolution limits of the processes. They are characterized by microscopy, X-ray tomography and permeability tests. Some aerothermal simulations help understanding the effects of these new designs on the flow and on heat exchanges. These results lead to a geometry adaptation.The second approach is to simultaneously manufacture an architectured part with dense and porous zones by EBM. Thanks to image analysis combined with large field EBSD, it is possible to investigate the mechanisms leading to the porous zones and to link them to permeability and porosity. The film cooling effect could be favoured by the orientation of pores towards the cooling flow. Therefore, a new powder-based manufacturing process named Magnetic Freezing, where metallic powders organize into an oriented structure thanks to a magnetic field, is developed.The various solutions studied during this thesis are tested on an aerothermal bench. They all show a more efficient and homogeneous cooling than the industrial reference. Some first tests on one of the selected solutions are performed on a combustion bench. This lighter and more permeable structure proves to be a solution as efficient as the industrial reference at a given flow rate. It should therefore be a more efficient solution for a given overpressure
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Zhou, Jian Ming. "A multi-grid method for computation of film cooling." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/29414.

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This thesis presents a multi-grid scheme applied to the solution of transport equations in turbulent flow associated with heat transfer. The multi-grid scheme is then applied to flow which occurs in the film cooling of turbine blades. The governing equations are discretized on a staggered grid with the hybrid differencing scheme. The momentum and continuity equations are solved by a nonlinear full multi-grid scheme with the SIMPLE algorithm as a relaxation smoother. The turbulence k — Є equations and the thermal energy equation are solved on each grid without multi-grid correction. Observation shows that the multi-grid scheme has a faster convergence rate in solving the Navier-Stokes equations and that the rate is not sensitive to the number of mesh points or the Reynolds number. A significant acceleration of convergence is also produced for the k — Є and the thermal energy equations, even though the multi-grid correction is not applied to these equations. The multi-grid method provides a stable and efficient means for local mesh refinement with only little additional computational and.memory costs. Driven cavity flows at high Reynolds numbers are computed on a number of fine meshes for both the multi-grid scheme and the local mesh-refinement scheme. Two-dimensional film cooling flow is studied using multi-grid processing and significant improvements in the results are obtained. The non-uniformity of the flow at the slot exit and its influence on the film cooling are investigated with the fine grid resolution. A near-wall turbulence model is used. Film cooling results are presented for slot injection with different mass flow ratios.
Science, Faculty of
Mathematics, Department of
Graduate
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Vattøy, Bjørnar. "Techno-economic evaluation of heat-driven cooling solutions for utilization of district heat in Aalesund, Norway." Thesis, KTH, Energiteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-245232.

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This study is aimed to evaluate the techno-economic feasibility of implementing heat driven cooling technologies in buildings connected to Tafjord Kraftvarme’s district heating network in Aalesund, Norway. Heating and cooling demands were found by projecting two 4000 𝑚2 office buildings according to Passive House and Low Energy Building criteria, within the frame of the energy requirements in the TEK17 building regulations (Standard Norge, 2012) (Norwegian Building Authority, 2017). Suitable cooling and heating equipment, both electrical and heat driven, were dimensioned based on the peak cooling load of the projected buildings, and technical and economic information obtained from the distributors of the equipment. LCOE analysis shows that the heat driven cooling solutions could be able to compete economically, in variable extent, with the electrically driven solutions given relatively low heating demand or by applying investment subsidies or price reduction on district heat for cooling purpose. The desiccant cooling solution could even compete with the electrical driven solution even without subsidies or price reduction on DH for cooling. This is mainly because of its enhanced heat recovery reducing the heating demand. The absorption cooler on the other hand, has both a higher consumption and higher power input of district heat while running, and is therefore less competitive without subsidy or price reduction on DH for cooling. In the building cases explored, the absorption cooling solution requires either subsidy or price reduction on DH for cooling to compete with the electric chiller and district heat solution, while it require both to come close to compete economically with the heat pump solutions. With increasing heating demand the heat driven solutions, which use district heat as their heat source, become less competitive compared to the heat pump solutions. This is because, with the mild winters in Aalesund, the heat pumps can run with a COP of 2-3 while the COP of district heat it is considered to be 1. Other important factors that is not covered by the LCOE analysis is the reliability and environmental aspect. None of the heat driven cooling solutions use any environmentally unfriendly refrigerants, and the maintenance of the cooling machines are minor. The lifetimes of the machines are estimated to be 20 years for the desiccant and 40 years for the absorption cooler, compared to 15 years for the heat pumps and electric chiller. The heat driven cooling solutions can therefore be considered more reliable both in terms of regulations on refrigerants and on maintenance and lifetime. An additional important factor is that compared to the heat pump solutions, the heat driven cooling solutions with district heat to cover the heating demand can replace large quantities of electricity consumption with low-grade thermal energy. Considering both the economic, environmental and reliability factors, the heat driven cooling solutions could be a viable option and should be considered when implementing heating and cooling equipment in buildings connected to the district heating network in Aalesund or other locations with similar climate.
Studiens syfte är att utvärdera den tekno-ekonomiska genomförbarheten av att implementera värmedrivna kylelösningar i byggnader knytna till Tafjord Kraftvarme’s fjärrvärmenetvärk i Aalesund, Norge. Uppvärmnings- och nerkylningskrav hittades vid at projictera två 4000 𝑚2 kontorsbyggnader enligt “Passive House and Low Energy Building” kriterier, inom ramen av energikrav i TEK 17 byggnadsförordningar (Standard Norge, 2012) (Norwegian Building Authority, 2017). Passande nerkylnings- och uppvärmingsutrustning, både elektrisk och värmedriven, blev dimensionerande baserad på toppbelastning till de projicerade byggnader, och den tekniska och ekonomiska information tagen från utrustningsdistributörerna. LCOE-analysen visar att den värmedrivna nerkylningslösningen kan vara konkurrenskraftig ekonomisk sett, i variabel utstreckning, med de elektriska drivna lösningarna om varmebehovet är lågt eller vid at använda subventioner eller prisnedsättning på fjärrvarme som används för kylning. Nerkylningslösningen med torkmedel kan även vara konkurrenskraftig med den elektrisk drivna även utan subventioner eller prisnedsättning på fjärrvarme. Det är huvudsakligen på grund av dens förbättrade värmeåterhämtning som reducerar uppvärmningskraven. Absorptionskylaren å andra sidan, har både högre ströminmatning av fjärrvarme medan den är i gång och är därför mindre konkurrenskraftig utan subventioner eller prisnedsättning på fjärrvarme som används för kylning. I de utforskade byggnadsfallen kräver absorptionskylaren antigen subventioner eller prisnedsättning på fjärvarme för att kunna konkurrera med den elektriska kylmaren, medan det krävs både för att kunna konkurrera med värmepumpelösningen. Med ökande uppvärmingskrav blir de värmedrivna lösningarna som använder fjärrvarme som värmekälla mindre konkurrenskraftiga jämfört med värmepumpelösningarna. Detta på grund av de milda vintrar i Aalesund som leder till att värmepumparna kan köra med en COP på 2-3 medan den anses vara 1 for lösningarna som brukar fjärrvarme. Andra viktiga faktorer som inte ingår i LCOE-analysen är pålitlighet och miljöaspekten. Ingen av de värmedrivna nerkylningslösningarna andvänder något miljöovänligt köldmedium och underhållet av nerkyningsmaskiner är minimalt. Maskinernas livsläng är beräknad till 20 år för torkmedelkylaren och 40 år för absorptionskylaren, jämfört med 15 år för värmepumparna och den elektriska kylaren. De värmedrivna nerkylningslösningarna kan därför  anses vara mer pålitliga både beträffande reglering av köldmedium och underhåll samt livslängd. Ytterligare en viktig faktor är att de värmedrivna nerkylningslösningarna, jämfört med värmepumplösningarna, kan vara et livskraftig alternativ, både med hänsyn til den ekonomiska faktoren, miljöfaktoren och pålitligheten och borde därför tas hänsyn till vid implementering av uppvärmings- og nerkylningsutrustning i byggnader knytna till fjärrvärmenätet.
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Narvaez, Javier Artemio. "Evaluation of Alumina Nanofluids and Surfactant Drag Reducing Solutions to Improve Heat Transfer for Aircraft Cooling Systems." University of Dayton / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=dayton154479500350447.

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Rabhi, Achref. "Numerical Modelling of Subcooled Nucleate Boiling for Thermal Management Solutions Using OpenFOAM." Licentiate thesis, Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-53307.

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Two-phase cooling solutions employing subcooled nucleate boiling flows e.g. thermosyphons, have gained a special interest during the last few decades. This interest stems from their enhanced ability to remove extremely high heat fluxes, while keeping a uniform surface temperature. Consequently, modelling and predicting boiling flows is very important, in order to optimise the two-phase cooling operation and to increase the involved heat transfer coefficients.  In this work, a subcooled boiling model is implemented in the open-source code OpenFOAM to improve and extend its existing solver reactingTwoPhaseEulerFoam dedicated to model boiling flows. These flows are modelled using Computational Fluid Dynamics (CFD) following the Eulerian two-fluid approach. The simulations are used to evaluate and analyse the existing Active Nucleation Site Density (ANSD) models in the literature. Based on this evaluation, the accuracy of the CFD simulations using existing boiling sub-models is determined, and features leading to improve this accuracy are highlighted. In addition, the CFD simulations are used to perform a sensitivity analysis of the interfacial forces acting on bubbles during boiling flows. Finally, CFD simulation data is employed to study the Onset of Nucleate Boiling (ONB) and to propose a new model for this boiling sub-model, with an improved prediction accuracy and extended validity range. It is shown in this work that predictions associated with existing boiling sub-models are not accurate, and such sub-models need to take into account several convective boiling quantities to improve their accuracy. These quantities are the thermophysical properties of the involved materials, liquid and vapour thermodynamic properties and the heated surface micro-structure properties. Regarding the interfacial momentum transfer, it is shown that all the interfacial forces have considerable effects on boiling, except the lift force, which can be neglected without influencing the simulations' output. The new proposed ONB model takes into account convective boiling features, and it able to predict the ONB with a very good accuracy with a standard deviation of 2.7% or 0.1 K. This new ONB model is valid for a wide range of inlet Reynolds numbers, covering both regimes, laminar and turbulent, and a wide range of inlet subcoolings and applied heat fluxes.
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Davin, Tanguy. "Refroidissement des moteurs électriques : exploration des solutions à huile de lubrification." Thesis, Valenciennes, 2014. http://www.theses.fr/2014VALE0003/document.

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Le moteur électrique est l’un des organes principaux d’un véhicule électrique. Sa température, notamment celle des bobines, doit être réduite pour éviter toute dégradation. Le refroidissement par l’extérieur, comme avec une chemise d’eau dans le carter, apparait limité car les pertes générées dans les bobines doivent traverser des zones où la conduction thermique est très mauvaise. L’extraction des calories au cœur de la machine est préférable, mais les échanges thermiques avec l’air sont modérés. En application automobile, le moteur électrique est situé à proximité d’un circuit d’huile de lubrification. Le refroidissement par l'huile en contact direct avec les bobines est étudié.La thèse s’est d’abord attachée à la recherche bibliographique étendue sur les différentes solutions de refroidissement de moteur. Ensuite, les transferts thermiques à l’intérieur du moteur ont été modélisés par méthode nodale. A travers une étude de sensibilité, les principales améliorations thermiques passives ont été dégagées, puis les systèmes de refroidissement eux-mêmes ont été modélisés. Enfin, des essais ont été réalisés sur un banc spécialement conçu. Pour cette partie expérimentale, le refroidissement direct des bobines par circulation d’huile a été étudié en détail. Différents types d’injecteurs d’huile sur les têtes de bobine ont été testés dans diverses conditions de vitesse du rotor, température et débit d’huile.L’objectif de cette thèse est d’analyser l’ensemble des problématiques thermiques liées aux solutions de refroidissement à huile. Il s’agit d’une étude comparative de la performance des solutions à huile entre elles et avec celle d’un refroidissement à eau plus conventionnel
Electric motor is one of the most important elements of an electric vehicle. Some elements, particularly the windings, can be affected by rising heat. External cooling, as water jacket in the case, appears to be limited because the losses generated in windings must pass through zones where conduction is very poor. Cooling in the core of the machine is preferable, but heat transfer with air is poor. Due to the presence of lubricating oil in the vicinity of the motor and the heat transfer enhancement that such a liquid provides, oil circulation on the windings has been considered.The research was first dedicated to an extensive bibliography on the different solutions of motor cooling. Then heat transfer within the motor was modelled by using the lumped system analysis. Thanks to a sensitivity analysis, the main parameters affecting temperature have been identified before cooling systems were modelled. Finally, tests were performed on a specially designed bench. Oil was introduced at each side of the machine to directly cool the stator coil end-windings. Several oil injection patterns were tested. The influence of the oil flow rate, rotation speed and oil temperature has been investigated.The objective of this PHD study is to analyse all the thermal issues related to the oil cooling systems. This is a comparative study of the performance of the oil cooling solutions. Comparison is also done with conventional water cooling
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Barthe, Stephanie Cecile. "Investigation and modeling of the mechanisms involved in batch cooling crystallization and polymorphism through efficient use of the FBRM." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24752.

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Thesis (Ph.D.)--Chemical Engineering, Georgia Institute of Technology, 2009.
Committee Chair: Dr Rousseau, Ronald W; Committee Co-Chair: Dr Grover Gallivan, Martha; Committee Member: Dr Realff, Matthew; Committee Member: Dr Garmestani, Hamid; Committee Member: Dr Nenes, Athanasios.
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Smith, Bryan C. "Flow birefringence, nuclear magnetic resonance and corrosion measurements on drag reducing cationic surfactant solutions for district heating and cooling systems /." The Ohio State University, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487780865409286.

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Books on the topic "Cooling solutions"

1

Schroeder, C. D. Solutions to boiler and cooling water problems. Atlanta, Ga: Fairmont Press, 1986.

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Solutions to boiler and cooling water problems. 2nd ed. New York: Van Nostrand Reinhold, 1991.

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Eaton, Edward R. Global testing of extended service engine coolants and related fluids. West Conshohocken, PA: ASTM International, 2014.

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M, Davidson Grace, and ASM International, eds. Accelerated cooling/direct quenching of steels: Proceedings from Materials Solutions '97 on Accelerated Cooling/Direct Quenching of Steels, 15-18 September 1997, Indiana Convention Center, Indianapolis, Indiana. Materials Park, Ohio: ASM International, 1997.

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International Symposium on Engine Coolants and Their Testing (1997 Scottscdale, AZ). Engine coolant testing : fourth volume. Edited by Beal Roy E and ASTM Committee D-15 on Engine Coolants. West Conshoshocken, Pennsylvania: ASTM, 1999.

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Symposium, on Engine Coolant: Development Testing and Use (1991 Scottsdale Ariz ). Engine coolant testing, third volume. Philadelphia, PA: ASTM, 1993.

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International Symposium on Engine Coolants and Their Testing (2nd 1984 Philadelphia, Pa.). Engine coolant testing: Second symposium : Second International Symposium on Engine Coolants and Their Testing, Philadelphia, Pennsylvania, 9-10 April 1984. Edited by Beal Roy E and ASTM Committee D-15 on Engine Coolants. Philadelphia, PA: ASTM, 1986.

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Engine Coolant and Antifreeze Bittering Agent Act of 2005: Report of the Committee on Commerce, Science, and Transportation on S. 1110 together with minority views. Washington: U.S. G.P.O., 2006.

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S. 1110, the Engine Coolant and Antifreeze Bittering Agent Act of 2005: Hearing before the Subcommittee on Consumer Affairs, Product Safety, and Insurance of the Committee on Commerce, Science, and Transportation, United States Senate, One Hundred Ninth Congress, first session, July 18, 2005. Washington: U.S. G.P.O., 2006.

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Cooling Energy Solutions for Buildings and Cities. World Scientific Publishing Co Pte Ltd, 2019.

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Book chapters on the topic "Cooling solutions"

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Valero, R., M. Manyalich, C. Cabrer, L. Salvador, and L. C. Garcia-Fages. "Total body cooling for organ procurement." In Organ Shortage: The Solutions, 67–72. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0201-8_10.

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Chiesa, Giacomo, and David Pearlmutter. "Ventilative Cooling in Combination with Other Natural Cooling Solutions: Direct Evaporative Cooling—DEC." In Innovations in Ventilative Cooling, 167–90. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-72385-9_8.

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Kheireddine, Mohamed-Abdelbassit, Amar Rouag, Adel Benchabane, Nora Boutif, and Adnane Labed. "Hybrid Cooling Tower for a Solar Adsorption Cooling System: Comparative Study Between Dry and Wet Modes in Hot Working Conditions." In Environmentally-Benign Energy Solutions, 293–308. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-20637-6_16.

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Chiesa, Giacomo. "Ventilative Cooling in Combination with Other Natural Cooling Solutions: Earth-to-Air Heat Exchangers—EAHX." In Innovations in Ventilative Cooling, 191–211. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-72385-9_9.

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Açıkkalp, Emin, Süheyla Yerel Kandemir, Önder Altuntaş, and T. Hikmet Karakoc. "Optimum Insulation Thickness for Cooling Applications Using Combined Environmental and Economic Method." In Environmentally-Benign Energy Solutions, 483–92. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-20637-6_25.

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Mondal, Santanu. "Transonic Flow Solutions with Explicit Cooling and Viscosity." In Astrophysics and Space Science Proceedings, 67–83. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-94607-8_6.

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Luerssen, Christoph, Chandra Sekhar, David Cheong, and Thomas Reindl. "Solar-Powered Cooling for the Remote Tropics." In Sustainable Energy Solutions for Remote Areas in the Tropics, 31–62. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-41952-3_3.

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Chandrasekar, Murugesan, Tamilkolundu Senthilkumar, and Poornanandan Gopal. "Cooling Approaches for Solar PV Panels." In The Effects of Dust and Heat on Photovoltaic Modules: Impacts and Solutions, 213–34. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-84635-0_8.

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Ratlamwala, Tahir A. H., Ibrahim Dincer, and Mohamed A. Gadalla. "Comparative Environmental Impact and Sustainability Assessments of Hydrogen and Cooling Production Systems." In Causes, Impacts and Solutions to Global Warming, 389–408. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-7588-0_24.

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Sane, Sandeep, Shalabh Tandon, Erich Ewy, and Luisa Cabrera Maynez. "Overview of Packaging Technologies and Cooling Solutions in ADAS Market." In Advanced Driver Assistance Systems and Autonomous Vehicles, 115–47. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-5053-7_4.

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Conference papers on the topic "Cooling solutions"

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Ardestani, Ehsan K., Francisco-Javier Mesa-Martinez, and Jose Renau. "Cooling solutions for processor Infrared Thermography." In 2010 IEEE/CPMT 26th Semiconductor Thermal Measurement, Modeling & Management Symposium (SEMI-THERM). IEEE, 2010. http://dx.doi.org/10.1109/stherm.2010.5444292.

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Mahendra Wankhede, Vivek Khaire, Avijit Goswami, and S. D. Mahajan. "Evaluation of cooling solutions for outdoor electronics." In 2007 13th International Workshop on Thermal Investigation of ICs and Systems (THERMINIC). IEEE, 2007. http://dx.doi.org/10.1109/therminic.2007.4451770.

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Wankhede, Mahendra, Vivek Khaire, Avijit Goswami, and S. D. Mahajan. "Evaluation of Cooling Solutions for Outdoor Electronics." In 2007 9th Electronics Packaging Technology Conference. IEEE, 2007. http://dx.doi.org/10.1109/eptc.2007.4469682.

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Svoboda, Matthias, and Robert Svoboda. "Operation and Maintenance Solutions for Generator Water Cooling." In 2012 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/icone20-power2012-54555.

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Plugging of copper hollow conductors in water cooled generators is an issue occasionally encountered in large nuclear, fossil and hydro powered power plants, causing load limitations or even unplanned shut-down. A response is the proper choice of stator water chemistry and of the purification systems. The common water chemistry regimes are with low or high oxygen content, and neutral or alkaline pH in the stator water. All these regimes have proven to work in the field, but none is without problems. This can be due to various causes. There is one common trait however: problems arise when the system is being exposed for any length of time to a regime it was not designed for. Stainless steel hollow conductors have only simple requirements on water chemistry. Hollow conductor plugging can lead to overheating and possibly to catastrophic failure, so swift action to remedy the situation is recommended. There are several options. Hot reverse flush can remove debris and temporarily open up the plugs, and mechanical cleaning can open totally blocked hollow conductors. There are several methods for chemical cleaning, the most common being different forms of acid cleaning and EDTA cleaning. The former has the disadvantage of dissolving base metal and brazing as well as the oxides, while the latter method manipulates less aggressive substances that only dissolve the copper oxides in the system.
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Galins, Janis, Aigars Laizans, and Ainars Galins. "Review of cooling solutions for compact electronic devices." In Research for Rural Development 2019 : annual 25th International scientific conference proceedings. Latvia University of Life Sciences and Technologies, 2019. http://dx.doi.org/10.22616/rrd.25.2019.030.

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Voigtmann, Steffen, Christoph Mudra, and Wolfgang Todt. "New advanced energy efficient cooling solutions for lasers." In ICALEO® 2010: 29th International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing. Laser Institute of America, 2010. http://dx.doi.org/10.2351/1.5062090.

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Connors, Matt. "Vapor Chambers in Blade Server CPU Cooling Solutions." In ASME 2007 InterPACK Conference collocated with the ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ipack2007-33779.

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Current blade processors need air cooling solutions that dissipate 100–300 watts with heat sinks that are less than 30 mm high. In order to cool these processors, the heat sink base has to grow in length and width to compensate for the lack of available height. As these dimensions grow, decreasing the base spreading of the heat sink becomes an important factor is decreasing the overall resistance of the heat sink. A vapor chamber used as a substitute to common copper or aluminum as the base of the heat sink can increase performance by 20–25%. A vapor chamber is a two phase heat transport system that significantly reduces the spreading resistance in applications where there is a high heat flux processor coupled with a large heat sink. In this paper, a CFD model will be constructed to predict the performance gains realized by using a vapor chamber base in lieu of a copper or aluminum base. These predictions will then be experimentally tested to confirm the modeling parameters and the actual measured thermal performance of the heat sink. By utilizing vapor chambers in heat sink design, thermal engineers will gain valuable heat sink performance within the constraints imposed by the blade system architecture.
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Zhang, Kai, David G. W. Xiao, Xiaohua Zhang, Haibo Fan, Zhaoli Gao, and Matthew M. F. Yuen. "Novel cooling solutions for LED solid state lighting." In High Density Packaging (ICEPT-HDP). IEEE, 2011. http://dx.doi.org/10.1109/icept.2011.6067026.

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Sulaimani, Husam, Ganesamoorthy Sellappan, and Mark Hamm. "Optimal Surface Cooling Solutions for Thermal EOR Projects." In Abu Dhabi International Petroleum Exhibition & Conference. Society of Petroleum Engineers, 2019. http://dx.doi.org/10.2118/197162-ms.

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Teufl, Helene, and Ardeshir Mahdavi. "Computational assessment of occupant-centric radiant cooling solutions." In 2021 Building Simulation Conference. KU Leuven, 2021. http://dx.doi.org/10.26868/25222708.2021.30182.

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Reports on the topic "Cooling solutions"

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Hachem-Vermette, Caroline, Matteo Formolli, and Daniele Vettorato. Surface Uses in Solar Neighborhoods. IEA SHC Task 63, September 2022. http://dx.doi.org/10.18777/ieashc-task63-2022-0002.

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This report has been completed through international collaboration under the International Energy Agency (IEA) Solar Heating and Cooling (SHC) Programme - Task 63 on Solar Neighborhood Planning. Specifically, the work contributes to Task 63 Subtask B - Economic Strategies and Stakeholder Engagement by identifying and discussing the potential usage of different urban surfaces in harvesting solar energy. Special focus has been placed on the identification of conflicts and synergies among solutions, and their contribution to the major climate resilience and sustainability objectives defined by solar neighborhoods.
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Johra, Hicham. Performance overview of caloric heat pumps: magnetocaloric, elastocaloric, electrocaloric and barocaloric systems. Department of the Built Environment, Aalborg University, January 2022. http://dx.doi.org/10.54337/aau467469997.

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Heat pumps are an excellent solution to supply heating and cooling for indoor space conditioning and domestic hot water production. Conventional heat pumps are typically electrically driven and operate with a vapour-compression thermodynamic cycle of refrigerant fluid to transfer heat from a cold source to a warmer sink. This mature technology is cost-effective and achieves appreciable coefficients of performance (COP). The heat pump market demand is driven up by the urge to improve the energy efficiency of building heating systems coupled with the increase of global cooling needs for air-conditioning. Unfortunately, the refrigerants used in current conventional heat pumps can have a large greenhouse or ozone-depletion effect. Alternative gaseous refrigerants have been identified but they present some issues regarding toxicity, flammability, explosivity, low energy efficiency or high cost. However, several non-vapour-compression heat pump technologies have been invented and could be promising alternatives to conventional systems, with potential for higher COP and without the aforementioned refrigerant drawbacks. Among those, the systems based on the so-called “caloric effects” of solid-state refrigerants are gaining large attention. These caloric effects are characterized by a phase transition varying entropy in the material, resulting in a large adiabatic temperature change. This phase transition is induced by a variation of a specific external field applied to the solid refrigerant. Therefore, the magnetocaloric, elastocaloric, electrocaloric and barocaloric effects are adiabatic temperature changes in specific materials when varying the magnetic field, uniaxial mechanical stress, electrical field or hydrostatic pressure, respectively. Heat pump cycle can be built from these caloric effects and several heating/cooling prototypes were developed and tested over the last few decades. Although not a mature technology yet, some of these caloric systems are well suited to become new efficient and sustainable solutions for indoor space conditioning and domestic hot water production. This technical report (and the paper to which this report is supplementary materials) aims to raise awareness in the building community about these innovative caloric systems. It sheds some light on the recent progress in that field and compares the performance of caloric systems with that of conventional vapour-compression heat pumps for building applications.
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Nitz, Peter, and Jürgen Fluch. Collection of available solar process heat related national and trans-national research and funding programs. IEA SHC Task 64, April 2021. http://dx.doi.org/10.18777/ieashc-task64-2021-0001.

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Within Task 64/IV Solar Process Heat, Subtask E Guideline to Market is aiming to support a wider penetration of solar thermal technologies in the supply of heating (and cooling) in industry, demonstrating Solar Heat for Industrial Processes (SHIP) to be an important contribution to the decarbonisation of the industrial sector. This requires not only to overcome technical and/or technological barriers, but it is crucial to also address on technical barriers. Whereas well suited system integration strategies, design tools, standardized procedures or modular components are all in all paramount for the development of reliable and prompt off the shelve solutions, experience shows that often non-technological barriers might have a critical role in the decision making process. Above all, competitiveness and investment/financing related barriers prove in many cases to be the bottleneck for the adoption of solar thermal technologies in the industrial framework.
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Miao, Yinbin, Sumit Bhattacharya, Nicolas Stauff, and Alisha Kasam-Griffith. Advanced Coolant Enclosure Solutions for Micro Gas Cooled Reactors with Enhanced Efficiency and Safety. Office of Scientific and Technical Information (OSTI), January 2022. http://dx.doi.org/10.2172/1906365.

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