Bibliografías temáticas / Refrigeration

Literatura académica sobre el tema "Refrigeration"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 8 de junio de 2024

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Artículos de revistas sobre el tema "Refrigeration"

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KHOROLSKY, Valentyn, Oleksandr OMELCHENKO, Yurii KORENETS, Volodymyr HONCHARENKO y Yulіya PETRUSHYNA. "REFRIGERATION SUPPLY OF REFRIGERATION CHAMBERS OF SMART INDUSTRIAL REFRIGERATORS WITH NEURON-FUZZY CONTROL SYSTEMS OF FOOD FREEZING PROCESSES". Herald of Khmelnytskyi National University 303, n.º 6 (diciembre de 2021): 264–71. http://dx.doi.org/10.31891/2307-5732-2021-303-6-264-271.

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A set of theoretical, methodological and practical problems associated with the creation of an intelligent complex for adaptive control of microclimate parameters, the processes of freezing food products in the refrigerating chambers of an industrial refrigerator has been studied. Accordingly, for this task, the structure of the neural network controller of the refrigeration capacity of refrigeration machines of the process control system of an industrial refrigerator was developed, in which information enters the database, a neural network with a learning module and turns into decision-making modules into management actions on the executive intelligent mechanisms of compressors, condensers, evaporators, minimizing CO2 emissions. A model of refrigeration supply for refrigerating chambers of an industrial refrigerator has been developed, in which the parameters of loading geometry and freezing speed, refrigerant pressure in the evaporator in real time determine the parameters of refrigeration supply for refrigerating chambers. The microclimate of the refrigerating chamber is estimated using a multi-parameter model of a neuron-odd decision tree with two integrated output nodes for classifying the state of refrigeration supply of refrigerating chambers. For the decision maker, an intelligent decision support system has been developed for the main block of the upper level of the process control system for an industrial refrigerator, which differs from analogues in the accuracy of predicting the quality of the frozen product by training the neural network using the backpropagation method. Simulation studies of the neural network control system for the refrigeration supply of refrigerating chambers and the process of freezing products with interchangeable structures proved that the system provides the specified control quality parameters, minimizes CO2 emissions and prevents the loss of taste properties of the frozen product.
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Zhang, Hua, Xu Ji, Ming Li, Qiang Wang y Xiang Bo Song. "A Comparative Study on Solar Refrigeration Technology". Applied Mechanics and Materials 541-542 (marzo de 2014): 887–91. http://dx.doi.org/10.4028/www.scientific.net/amm.541-542.887.

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This paper performed a comparative study on solar photovoltaic refrigeration technology and solar adsorption refrigeration technology. The experimental results showed that in sunny day, COP of the solar fin pipe adsorption refrigerator was 0.13, and was higher than 0.12, COP of the photovoltaic refrigerator. With the solar radiation enhancement within a certain range, the COP of solar adsorption refrigerator increased faster than COP of solar photovoltaic refrigerator. From the aspects of economy, with the same refrigerating capacity, the cost of the adsorption refrigerators was 30% higher than that of the photovoltaic refrigerators.
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Ruzikulov, Gulom, Umidjon Ibragimov, Shakhriyor Ergashev, Sokhiba Shamurotova y Malika Nurova. "Mathematical modeling of the refrigerating chamber of a combined solar dryer-refrigerator with a heat pump". E3S Web of Conferences 524 (2024): 02007. http://dx.doi.org/10.1051/e3sconf/202452402007.

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Mathematical modeling appears to be a valuable tool for controlling the cooling and storage process of agricultural products. Therefore, mathematical modeling of the balance of heat and mass in refrigeration chambers is relevant. Mathematical modeling of the thermal regime of the thermal regime of a refrigeration chamber with a heat pump and determining temperature changes depending on time. Mathematical modeling is carried out based on the thermal balance of the refrigerating chamber by the method of conservation of mass and energy. It has been established that cooling and long-term storage of agricultural products in refrigeration chambers require a huge amount of electrical energy. At an outside air temperature of 30℃, it takes 30-40 minutes to cool products to the required temperature; for long-term storage, 5.5-6.0 kWh/day of electrical energy is consumed. A combined dryer-refrigerator with a heat pump for storing agricultural products is proposed and a mathematical model of the refrigeration chamber is given, which makes it possible to analyze the temperature regime in the refrigeration chamber.
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KHOROLSKY, Valentyn, Yurii KORENETS, Yulіya PETRUSHYNA y Ivan RASCHEKHMAROV. "IMPROVEMENT OF SYSTEMS FOR MONITORING AND CONTROLLING THE PROCESS OF FREEZING PRODUCTS IN REFRIGERATING CHAMBERS OF INDUSTRIAL REFRIGERATORS". Herald of Khmelnytskyi National University 305, n.º 1 (23 de febrero de 2022): 247–55. http://dx.doi.org/10.31891/2307-5732-2022-305-1-247-255.

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The article proposes a set of theoretical and practical attributes associated with design decisions regarding the processes of freezing meat products in refrigerators with a large load capacity of industrial refrigerators. A system of intelligent sensors has been developed to control the parameters of the geometry of the carcass of cattle meat and signs of the state of the evaporators of the refrigeration chamber and the refrigeration supply system of an industrial refrigerator. An automatic recognition system has been developed that works in real time and determines: geometric parameters of local and integral sections of the carcass in the form of a plane, radii, length, width, number of contour inflection points, geometric center of image elements; humidity settings. This system constantly analyzes the space of sections of the refrigerating chamber. An intelligent system for neurocontrol of the refrigeration supply of a refrigerating chamber is proposed, in which two video cameras and matrix sensors with piezoelectric elements for assessing the shape of a cattle carcass are mounted; it has been proved that the expert ink image bank allows using reference methods of comparative analysis. Thanks to the interface with information support subsystems, the system provides the operator-technologist with video information and automatically affects the intelligent actuators of compressors, fans, condensers. A system for neuro-fuzzy control of the evaporator freezing process has been developed, which provides for an expert system, a recognition algorithm, an expert image bank of an evaporator with a snow coat and an intelligent mechanism for the impact of ultrasonic vibrations on the surface of a cooling device. A generalized algorithm for the operation of refrigeration control systems for the refrigerating chamber of an industrial refrigerator and a method for its use are presented.
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Kasi, Parthiban y M. Cheralathan. "Review of cascade refrigeration systems for vaccine storage". Journal of Physics: Conference Series 2054, n.º 1 (1 de octubre de 2021): 012041. http://dx.doi.org/10.1088/1742-6596/2054/1/012041.

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Abstract Various models are already developed to achieve the refrigerating effect. Each refrigeration system has its own set of benefits and drawbacks, as well as a unique application. The vapor compression refrigeration system and the sorption refrigeration system are the two most prominent refrigeration technologies that may be utilized for a variety of purposes. In the medical profession, cascade refrigeration will be established in the storage of blood banks, plasma, vaccines, bone banks, biological fluids storage, etc. Storing heat-sensitive vaccines at the right temperature is crucial yet often difficult by the availability of ultralow temperature cold storage. This paper has reviewed that the different types of cascade refrigeration systems for a better refrigerating effect on vaccine storage.
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KHOROLSKY, Valentyn, Yurii KORENETS, Oleksandr OMELCHENKO y Volodymyr HONCHARENKO. "REFRIGERATION MACHINES IN THE SYSTEM OF CONSISTENT MANAGEMENT OF ELECTRIC ENERGY CONSUMPTION OF THE COMPLEX ENTERPRISE-INDUSTRIAL REFRIGERATOR". Herald of Khmelnytskyi National University. Technical sciences 313, n.º 5 (27 de octubre de 2022): 200–212. http://dx.doi.org/10.31891/2307-5732-2022-313-5-200-212.

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The strategy of the coordinated management of electric consumption of the industrial refrigerator of the enterprise of a food complex on production of foodstuff is offered. The structure of the integrated intelligent power management system of the refrigerator enterprise has been developed, in which the systems of automated control of electricity metering and control of the refrigeration trajectory of refrigeration chambers are built-in. The system uses a situation center, industrial Internet of Things (IIoT), digital platform “FOOD” with software (freezing of food products). According to the ASUE-ACS command, the upper level of the industrial refrigerator and its software fulfill the set parameters of the portfolio of orders for active and reactive capacities of the food complex enterprises. An algorithm for controlling an industrial refrigerator during periods of power system power limitations has been developed. It is proved that the reduction of specific energy consumption for the production of one ton of frozen food during the period of power system power limitations and fan outages is possible only by optimizing the technological and energy parameters of refrigeration machines. Technologies for reducing energy consumption by controlling the reactive and active power of synchronous motors of reciprocating compressors and frequency control of asynchronous motors of screw compressors and asynchronous motors of evaporating condensers are presented. Simulation of the geometry of the in-chamber loading of the refrigerating chambers of an industrial refrigerator is performed. New approaches to the choice of adaptive regulators of synchronous motor exciters have been developed, which are coordinated in real time with the energy modes of operation of refrigeration machines and the geometry of refrigeration chamber loading. The possibility of improving the efficiency of power management regimes of food industry enterprises through coordinated automated control of cooling and freezing of meat products, poultry, fish, dairy products, fruits and the use of automated power management systems by building expert and human-machine decision making systems. The developed systems will allow to meet the requirements of energy generating companies for active and reactive loads, reduce costs in the power grid and maintain the voltage in the nodes of electrical receivers within the established norms.
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7

Liu, Hui, Jin Hua Li y Hong Xiao. "Research on the Application of Alternative Refrigerants R407C and R410A in Refrigeration-Type Compressed-Air Dryers". Applied Mechanics and Materials 672-674 (octubre de 2014): 1739–42. http://dx.doi.org/10.4028/www.scientific.net/amm.672-674.1739.

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The coefficient of performance (COP), the volumetric refrigeration capacity and the pressure ratio of refrigeration cycle were studied in a refrigeration-type compressed-air dryer using environmentally friendly refrigerants R410A and R407C and compared with those using R22. Study indicates that under the working condition of a refrigeration-type compressed-air dryer, COP using R410A is 3% higher than that using R407C, the volumetric refrigeration capacity using R410A is 50 percentage points higher than that using R407C and the pressure ratio of R410A is 10% less than that of R407C. COP using R410A equals 96% of that using R22 and the volumetric refrigerating capacity equals 147% of that using R22. COP using R407C is equal to 93% of that using R22 and the volumetric refrigerating capacity is equal to 97% of that using R22. R410A is a more appropriate alternative to R22 than R407C in a refrigeration-type compressed-air dryer.
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8

Adler, Eytan J., Benjamin J. Brelje y Joaquim R. R. A. Martins. "Thermal Management System Optimization for a Parallel Hybrid Aircraft Considering Mission Fuel Burn". Aerospace 9, n.º 5 (26 de abril de 2022): 243. http://dx.doi.org/10.3390/aerospace9050243.

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Electrified aircraft propulsion enables new aircraft designs with fewer emissions. One challenge of electrified architectures is handling the electrical components’ waste heat. This is because batteries and other electrical components are sensitive to high temperatures and accumulate heat within their structure. In this work, we investigate using a thermoacoustic refrigerator to cool the battery of a parallel hybrid single-aisle commercial transport aircraft. This thermoacoustic refrigeration system is powered by waste heat from the turbofan engine core, whereas a conventional refrigerator consumes electricity from the battery or shaft power offtakes. Compared to a conventional vapor cycle refrigerator, the thermoacoustic refrigeration system results in greater mission fuel burn because of pressure losses attributable to the extraction of heat from the turbofan to drive the thermoacoustic refrigerator. Heat exchangers with very low pressure losses may render the thermoacoustic refrigeration system beneficial compared to conventional refrigeration in certain use cases, such as low-altitude missions.
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Adler, Eytan J., Benjamin J. Brelje y Joaquim R. R. A. Martins. "Thermal Management System Optimization for a Parallel Hybrid Aircraft Considering Mission Fuel Burn". Aerospace 9, n.º 5 (26 de abril de 2022): 243. http://dx.doi.org/10.3390/aerospace9050243.

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Electrified aircraft propulsion enables new aircraft designs with fewer emissions. One challenge of electrified architectures is handling the electrical components’ waste heat. This is because batteries and other electrical components are sensitive to high temperatures and accumulate heat within their structure. In this work, we investigate using a thermoacoustic refrigerator to cool the battery of a parallel hybrid single-aisle commercial transport aircraft. This thermoacoustic refrigeration system is powered by waste heat from the turbofan engine core, whereas a conventional refrigerator consumes electricity from the battery or shaft power offtakes. Compared to a conventional vapor cycle refrigerator, the thermoacoustic refrigeration system results in greater mission fuel burn because of pressure losses attributable to the extraction of heat from the turbofan to drive the thermoacoustic refrigerator. Heat exchangers with very low pressure losses may render the thermoacoustic refrigeration system beneficial compared to conventional refrigeration in certain use cases, such as low-altitude missions.
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10

Kudrov, Yu V., L. V. Sumzina, A. V. Maksimov y S. L. Filimonov. "Calorimetric stand for research of processes in the refrigeration unit". Herald of Dagestan State Technical University. Technical Sciences 49, n.º 2 (16 de agosto de 2022): 18–23. http://dx.doi.org/10.21822/2073-6185-2022-49-2-18-23.

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Objective. The aim of the work is to develop a calorimetric stand that allows simulating the operation of an energy-efficient two-evaporator refrigeration unit of a household refrigerator or freezer.Method. In the course of the work, a calorimetric setup is described that allows conducting experimental studies to determine the cooling capacity and energy efficiency of a modernized refrigeration unit of a household refrigerator.Result. Currently, new resource-saving circuit solutions for household refrigeration equipment have been developed. The developed solutions make it possible to increase the efficiency of the refrigeration unit, as well as to reduce its energy consumption. Theoretical calculations confirming these indicators have been carried out. To confirm the calculated values, automated experimental studies are required to determine the parameters of the refrigeration unit. The paper proposes a description of an automated calorimetric stand that allows simulating the operation of an energy-efficient dual-evaporator refrigeration unit of a household refrigerator or freezer.Conclusion. The designed calorimetric stand will allow carrying out complex experimental studies to determine the cooling capacity of the modernized refrigeration unit when operating on various refrigerants. The experimental setup also makes it possible to measure the temperature and pressure during the operation of the refrigeration unit, as well as to determine the influence of various factors on its characteristics.
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Tesis sobre el tema "Refrigeration"

1

Delano, Andrew Douglas. "Analysis of the Einstein refrigeration cycle". Thesis, Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/17887.

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Delano, Andrew D. "Design analysis of the Einstein refrigeration cycle". Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/17578.

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Altenhof, Jeffrey L. "Computer-aided concurrent engineering in refrigeration system design". Master's thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-01262010-020010/.

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Wilson, Kyle B. "The use of Sage simulation software in the design and testing of Sunpower's pulse tube cryocooler". Ohio : Ohio University, 2005. http://www.ohiolink.edu/etd/view.cgi?ohiou1126908659.

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Lough, Benjamin C. C. "Investigations into thermionic cooling for domestic refrigeration". School of Engineering Physics - Faculty of Engineering, 2004. http://ro.uow.edu.au/theses/230.

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Thermionic refrigeration using semiconductor heterostructures is examined theoretically and experimentally. A theory of single-barrier devices is first developed where two classes of single-barrier devices are defined and compared. So-called class 1 devices are found to always perform better. A theory of multiple-barrier devices based on class 1 barriers is then developed using a numerical solution. Experimentally, three generations of 10-barrier devices based on A1(subscript x)Ga(subscript 1-x)As-GaAs heterostructures were made and electrically characterised. This material is by no means ideal (as will be discussed) but was used to availability and because, at the commencement of this work, had never been used for this purpose before. Thermal measurements were made to determine if any cooling occurred at room temperature. No cooling was observed but the electrical characteristics allowed for examination of the models developed. It was found that the earlier models used did not accurately model the I-V characteristics of the devices. This was attributed to the fact that the initial models did not take space-charge into account. A more robust numerical model is developed in which the I-V characteristics of devices are predicted much more accurately. This model is then used to design new generations of devices. The work concludes by recommending a next generation design in which substantially more cooling is expected compared to the samples examined here. The probability of cooling being observed in the future is therefore increased. The types of devices described here will always be hindered because of heat conduction. Other methods incorporating thermionic emission, such as an opto-thermionic system in which removed heat is given off as light, may ultimately prove to be the best solution. This aside, it is hoped that the work presented here will contribute to the understanding of the field.
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Menegay, Peter. "Experimental investigation of an ejector as a refrigerant expansion engine". Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-10222009-124957/.

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Mirza-Tolouee, Changiz M. "Experimental study of zeotropic refrigerant mixture HFC-407C as a replacement for HCFC-22 in refrigeration and air-conditioning systems". Australasian Digital Thesis Program, 2006. http://adt.lib.swin.edu.au/public/adt-VSWT20070416.141307/index.html.

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Thesis (PhD) - Swinburne University of Technology, Faculty of Engineering and Industrial Sciences, 2006.
A thesis submitted for the degree of Doctor of Philosophy, School of Engineering and Science, Swinburne University of Technology, 2006. Typescript. Includes bibliographical references (p. 123-127).
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Mavalankar, Aquila Mukund. "Thermometry and refrigeration using quantum dots". Thesis, University of Cambridge, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708092.

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Yildiz, Seyfettin. "Design And Simulation Of A Vapor Compression Refrigeration Cycle For A Micro Refrigerator". Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612133/index.pdf.

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Cooling of electronic equipments has become an important issue as the advances in technology enabled the fabrication of very small devices. The main challenge in cooling is the space limitation. The use of miniature refrigerators seems to be a solution alternative for the cooling problem. The objective of this study is to design and simulate a vapor compression refrigeration cycle for a micro-scale refrigerator. A MATLAB code is developed for the simulations. The four components of the refrigerator, namely, the condenser, evaporator, compressor and the capillary tube are designed separately. The cycle is successfully completed nearly at the same point where it begins. The cold space temperature, ambient air temperature, condensation and evaporation temperatures, and the evaporator heat load are the predetermined parameters. A fan is used to cool the condenser, and the compressor is selected as isentropic. R-134A is selected as the refrigerant and a simple interpolation code is developed to obtain the thermophysical properties of R-134A. The original design is carried out with an isentropic compressor. For the purpose of comparison, a cycle with a polytropic compressor is also considered. Similarly, two alternative designs for the evaporator are developed and simulated. A second law analysis is performed at the end of the study.
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Swart, JC. "Solar refrigeration using the Peltier Effect". Thesis, Cape Technikon, 1996. http://hdl.handle.net/20.500.11838/1153.

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Thesis (Master Diploma (Electrical Engineering))--Cape Technikon, Cape Town,1996
In order to design a coolerbox, utilising Thermo-electric technology as a heat pump, it was necessary to determine if this type of technology would be suitable for a coolerbox heat pump application. A detailed TEC (Thermo Electric Cooler) sizing estimation was done, using formulas supplied by the manufacturer, and using thermo-electric themy formulas to calculate the absolute theoretical performance parameters for a suitable TEe The correct heat pumping capability is important since.it is possible to obtain TEes with different input currents, voltages and heat pumping capabilities. Using the TEC as a heat pump, it was decided to use water cooling due to the extremely high cost of a suitable air cooled heatsink. It should be noted that to cool the hot side of theTEe a vel}' efficient heat exchanger should be used. A simulator was constructed to simulate, under variable operating temperatures and input powers, the cooling capacity of the TEC heat exchanger. The cooling characteristics were then used to determine if the theol}' and manufacturers claims correspond with the cooling characteristics of the coolerbox. It might be possible that the performance of the TEC would be drastically influenced, since installation con~itions may not be ideal when installed; and, that the manufacturers performance claims are done when the TEC is operated under ideal conditions. This would ensure optimum results because, should an under sized TEC be used, the result would be poor cooling characteristics; or, if the TEC is over sized, the coolerbox would consume too much power, resulting in an inefficient system.
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Libros sobre el tema "Refrigeration"

1

Helen, Carwardine y Butcher Ken, eds. Refrigeration. London: Chartered Institution of Building Services Engineers, 2008.

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2

Industrial refrigeration. Troy, Mich: Business News Pub. Co., 1988.

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3

Welch, Mary F., Lori L. Mort, Carol G. Bowman y Diana E. Kole. Commercial & household refrigeration equipment. Cleveland: Freedonia Group, 2000.

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4

Dossat, Roy J. Principles of refrigeration. 3a ed. Englewood Cliffs: Prentice Hall International, 1991.

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1957-, Horan Thomas J., ed. Principles of refrigeration. 5a ed. Upper Saddle River, N.J: Prentice Hall, 2002.

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Olivo, C. Thomas. Principles of refrigeration. 3a ed. Albany, N.Y: Delmar Publishers, 1990.

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Fundamentals of refrigeration. Albany: Delmar, 1995.

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Stoecker, W. F. Industrial refrigeration handbook. New York: McGraw-Hill, 1998.

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Dossat, Roy J. Principles of refrigeration. 3a ed. Englewood Cliffs, N.J: Prentice Hall, 1991.

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Principles of refrigeration. 4a ed. Englewood Cliffs, N.J: Prentice Hall, 1997.

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Capítulos de libros sobre el tema "Refrigeration"

1

Marshall, Robert T. y W. S. Arbuckle. "Refrigeration". En Ice Cream, 292–300. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/978-1-4613-0477-7_17.

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Toledo, Romeo T., Rakesh K. Singh y Fanbin Kong. "Refrigeration". En Food Science Text Series, 277–305. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-90098-8_10.

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Toledo, Romeo T. "Refrigeration". En Fundamentals of Food Process Engineering, 398–436. Boston, MA: Springer US, 1993. http://dx.doi.org/10.1007/978-1-4615-7052-3_10.

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Toledo, Romeo T. "Refrigeration". En Fundamentals of Food Process Engineering, 398–436. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-7055-4_10.

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Arbuckle, W. S. "Refrigeration". En Ice Cream, 343–51. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4615-7222-0_19.

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Marshall, Robert T., H. Douglas Goff y Richard W. Hartel. "Refrigeration". En Ice Cream, 207–23. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4615-0163-3_8.

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Arbuckle, W. S. "Refrigeration". En Ice Cream, 343–51. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4757-5447-6_19.

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Granet, Irving, Jorge Luis Alvarado y Maurice Bluestein. "Refrigeration". En Thermodynamics and Heat Power, 495–544. Ninth edition. | Boca Raton, FL : CRC Press, [2021]: CRC Press, 2020. http://dx.doi.org/10.1201/9780429299629-10.

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O'Neal, Dennis L. "Refrigeration". En Mechanical Engineers' Handbook, 421–64. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2006. http://dx.doi.org/10.1002/0471777471.ch12.

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Voloshchuk, Volodymyr. "Refrigeration Cycles". En Thermal Engineering Studies with Excel, Mathcad and Internet, 263–85. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-26674-9_19.

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Actas de conferencias sobre el tema "Refrigeration"

1

Westra, Douglas G., L. Barry Penswick y Ronald W. Olan. "Low Temperature Stirling Cycle Refrigerator for Spacecraft Refrigeration Systems". En International Conference On Environmental Systems. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1997. http://dx.doi.org/10.4271/972385.

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Little, W. A., J. G. Weisend, John Barclay, Susan Breon, Jonathan Demko, Michael DiPirro, J. Patrick Kelley et al. "MICROMINIATURE REFRIGERATION". En ADVANCES IN CRYOGENIC ENGINEERING: Transactions of the Cryogenic Engineering Conference - CEC, Vol. 52. AIP, 2008. http://dx.doi.org/10.1063/1.2908603.

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Kassels, Seth M. y Michael J. Brandemuehl. "Design of Photovoltaic-Powered Refrigeration for Tropical Climates". En ASME 2006 International Solar Energy Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/isec2006-99153.

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The increased global demand for energy will generate a growing need to electrify rural populations. Photovoltaic systems are being considered for many rural areas in the tropics. The development of photovoltaic-powered refrigeration will provide access to food preservation, which will result in improved health conditions. The over-arching objective of this investigation is to develop a properly designed, cost effective and energy efficient photovoltaic-powered refrigerator for tropical climates. The specific objectives of this investigation are to develop a design methodology and evaluate design variables for a photovoltaic system and refrigeration unit for tropical climates (high heat, low sun) that can be manufactured at relatively low costs. The price goal for the refrigerator and photovoltaic system is $1,000 retail. The investigation was accomplished through a five-step process: 1) background engineering and market research, 2) modeling, 3) model verification, 4) hourly simulation, and 5) cost analysis. Results indicate that over-sizing the condenser and the extreme insulation of the refrigeration unit reduced the overall cost of the refrigerator and photovoltaic system. Also, the investigation demonstrated that proper design of the photovoltaic system is the key to determining the refrigerator’s ability to perform in harsh climates.
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Sait, H. H., B. A. Habibullah, N. Turkman y H. B. Ma. "Experimental Investigation of Ejector Refrigeration System With Double Condensers". En ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-88671.

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This paper presents the results of an experimental investigation of a steam jet refrigerator suitable for renewable or low-medium grade waste energy applications. An experimental system of an ejector refrigeration system was constructed and fabricated. Different parameters of the ejector refrigeration system were investigated, such as the high-temperature evaporator (HTE) temperature, low temperature evaporator (LTE) temperature, and back pressure. The coefficient of performance (COP) of the ejector refrigeration system was determined. In addition, the effects of the operating temperatures on the COP and critical back pressure were investigated. The results are expected to motivate the use of ejector refrigeration systems for air-conditioning.
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Y.I., Babenkov, Ozersky A.I., Romanov V.V. y Galka G.A. "INVESTIGATION OF THE EFFICIENCY OF THERMAL INSULATION OF AGRICULTURAL REFRIGERATION CHAMBERS". En "INNOVATIVE TECHNOLOGIES IN SCIENCE AND EDUCATION". ДГТУ-Принт, 2021. http://dx.doi.org/10.23947/itno.2021.71-75.

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The calculation of the main thermodynamic parameters of the agro-industrial complex refrigerating chamber is performed. The heat flows and the economic efficiency of the refrigerating chamber are determined. The heat transfer and heat transfer coefficients are calculated. A model of a refrigeration unit is proposed. The properties of polyurethane foam are described.
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Qing, E., Feng Wu, Duanyong Li y Fangzhong Guo. "Thermoacoustic Refrigeration Device". En 2009 Asia-Pacific Power and Energy Engineering Conference. IEEE, 2009. http://dx.doi.org/10.1109/appeec.2009.4918931.

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Morales, M. J. y S. A. Sherif. "Optimal Allocation of Heat Transfer Surface of a Two-Stage Refrigeration System". En ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56815.

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The purpose of this study is to investigate how the heat exchanger inventory allocation plays a role in maximizing the thermal performance of a two-stage refrigeration system with two evaporators. First, the system is modeled as a Carnot refrigerator and a particular heat transfer parameter is kept constant as the heat exchanger allocation parameter is allowed to vary. The value of the heat exchanger allocation parameter corresponding to the maximum coefficient of performance (COP) is noted. The results are compared to those of a non-Carnot refrigerator with isentropic and non-isentropic compression. It is found that the Carnot refrigerator can be used to predict the value of the heat exchanger allocation parameter where the maximum COP occurs for a non-Carnot refrigerator. In order to improve the accuracy of that prediction, the predicted value of the heat exchanger allocation parameter has to be inputted into the set of equations used for the non-Carnot refrigerator. This study is useful in designing a low cost, high-performance refrigeration system.
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Phelan, Patrick E., Victor Chiriac y Tien-Yu Tom Lee. "Performance Comparison of Mesoscale Refrigeration Technologies for Electronics Packaging". En ASME 2003 International Electronic Packaging Technical Conference and Exhibition. ASMEDC, 2003. http://dx.doi.org/10.1115/ipack2003-35140.

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Utilizing refrigeration is one alternative to improve the operating performance of microelectronic devices. Unless large-scale refrigeration systems are acceptable, it is likely that miniature, or mesoscale, refrigerators will be required that can be directly incorporated into electronic packaging. The present study builds on the authors’ previous investigation of mesoscale refrigerators, which emphasized how only thermoelectric coolers (TEC’s) are capable of being miniaturized in the near future. Many other refrigeration systems, however, are being examined for their potential to be miniaturized, including the vapor-compression, Stirling, and pulse-tube cycles. Here a simple analysis is presented that shows the feasibility of utilizing these systems in electronics packaging. One finding is that, provided a suitable mesoscale compressor can be constructed, a vapor-compression refrigerator may yield the best performance of the investigated systems.
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Takeshita, Keisuke, Masao Tomizawa, Akinori Nagashima, Yoshiharu Amano y Takumi Hashizume. "Comparison of Hybrid Configurations of Power Generation and Refrigeration Cycles Using Ammonia-Water Mixture". En ASME 2005 Power Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/pwr2005-50358.

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This paper describes performance comparison of two types of hybrid configuration of power generation and refrigeration cycles using ammonia-water mixture by simulation calculation. Difference between two configurations is the ammonia mass fraction of solution from the turbine system (power generation cycle) to the ammonia absorption refrigerator (refrigeration cycle). The newer configuration (configuration 2) supplies higher mass fraction solution to the refrigerator. As a result, both configurations show larger system net power than separate operations when the basic composition (the ammonia mass fraction of the evaporator in the turbine system) is 0.45 kg/kg. The performance gains of configuration 1 and 2 are 13.6% and 13.8%, respectively.
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Tiedeman, J. S. y S. A. Sherif. "Optimum Refrigerating Efficiency and Exergy Index of a Two-Stage Refrigeration Cycle". En ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56807.

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This paper presents results of an optimization study for a two-stage vapor compression refrigeration cycle based on the refrigerating efficiency and exergy index. Traditional two-stage refrigeration cycle studies have focused on the first law performance, while those studies dealing with the second law have primarily been limited to performance analysis as opposed to performance optimization. Results of this study indicate that the use of the common approximation of the geometric mean to find the optimum interstage pressure leads to nearly optimum results for the refrigerating efficiency, with maximum error in the neighborhood of 5%. However, the error associated with using this approximation to find the optimum exergy index is too large, approaching 15%. Second law optimization revealed that the optimum data curves themselves have maxima for each set of conditions tested. There are a series of conditions that lead to the conclusion that, for a given system, there is an optimum set of conditions that lead to the lowest amount of exergy destruction for that system. Polynomial equations have been fitted to the resultant optimum data for the refrigerating efficiency and exergy index. These equations allow for the reproduction of optimum points based on high- and low-pressure compressor efficiencies and condenser and evaporator pressures.
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Informes sobre el tema "Refrigeration"

1

Specht, J. R., B. Millar y A. Sutherland. Helium-refrigeration system. Office of Scientific and Technical Information (OSTI), agosto de 1995. http://dx.doi.org/10.2172/166402.

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Storch, Peter J. Analytical model for the refrigeration power of the orifice pulse tube refrigerator. Gaithersburg, MD: National Bureau of Standards, 1990. http://dx.doi.org/10.6028/nist.tn.1343.

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Mohseni, Hooman. Solid-State Quantum Refrigeration. Fort Belvoir, VA: Defense Technical Information Center, marzo de 2013. http://dx.doi.org/10.21236/ada582320.

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Reis, Chuck, Eric Nelson, James Armer, Tim Johnson, Adam Hirsch y Ian Doebber. Refrigeration Playbook. Heat Reclaim; Optimizing Heat Rejection and Refrigeration Heat Reclaim for Supermarket Energy Conservation. Office of Scientific and Technical Information (OSTI), marzo de 2015. http://dx.doi.org/10.2172/1215136.

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Fricke, Brian A. y Vishaldeep Sharma. High Efficiency, Low Emission Refrigeration System. Office of Scientific and Technical Information (OSTI), agosto de 2016. http://dx.doi.org/10.2172/1311267.

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Green, Michael A. The Cryogenic refrigeration system for MICE. Office of Scientific and Technical Information (OSTI), noviembre de 2002. http://dx.doi.org/10.2172/926451.

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Skone, Timothy J. NGL Extraction from EOR Gas - Refrigeration. Office of Scientific and Technical Information (OSTI), octubre de 2012. http://dx.doi.org/10.2172/1509419.

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Hesse, Ullrich. User Manual for Refrigeration System Monitor. Fort Belvoir, VA: Defense Technical Information Center, mayo de 1996. http://dx.doi.org/10.21236/ada310114.

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Hesse, Ullrich. Maintenance Manual for Refrigeration System Monitor. Fort Belvoir, VA: Defense Technical Information Center, mayo de 1996. http://dx.doi.org/10.21236/ada310115.

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Rovero, C. y D. Waddle. Vaccine refrigeration technologies and power sources. Office of Scientific and Technical Information (OSTI), octubre de 1989. http://dx.doi.org/10.2172/5358059.

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