Application of Integrated Cold Thermal Energy Storage for Improving the Performance of Vapor-Compression Refrigerators
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APPLICATION OF INTEGRATED COLD THERMAL ENERGY STORAGE FOR IMPROVING THE PERFORMANCE OF VAPOR-COMPRESSION REFRIGERATORS A. S. Kolesnikov, A. S. Krotov, A. I. Egorova, Ya. V. Samokhvalov, and D. M. Pronin
UDC 621.565.2
New options of the design of a vapor-compressor refrigerator with cold thermal energy storage are proposed. A comparative analysis of the performance of the considered systems is carried out. Results on the effectiveness of using various methods of cold thermal energy storage in the vapor-compression refrigerator circuit have been obtained. Recommendations regarding the field of application of these systems and the volume of cold thermal energy storages are given. Keywords: cold thermal energy storage, latent heat, vapor-compression refrigerator, simulation.
One of the ways to reduce the energy consumption of refrigerators is the usage of cold thermal energy storages, i.e. the organization of the refrigerator operation, taking into account the generation and storage of the required amount of thermal energy (of required temperature) in one conditions and its use by the consumer in other conditions at some other time. It requires: non-uniform consumption of cold over time, e.g. cyclical or with peaks; periodic availability of rational conditions for cold generation, i.e. a daily (or seasonal) decrease in the ambient temperature or a reduced cost of electricity (at night). The tasks that satisfy these conditions include: air conditioning (household, office, sports, transport, etc.), food production facilities, and storage of goods in retail. Today, the use of solar cooling with a cyclical nature of energy generation, where cold thermal energy storages are very effective, is relevant [1]. When implementing systems with cold thermal energy storage, modern technical capabilities are not fully used. Earlier, the only convenient way to store cold was the accumulation of ice, chilled water or eutectic solutions using an intermediate refrigerant circuit, which is irrational for many refrigerator designs. To date, a number of substances have been developed that make it possible to store significant amounts of latent heat in the entire range of operating temperatures (negative and positive) in small volumes and masses, i.e. it is possible to use the thermal energy storage directly in the vapor-compression refrigerator (VCR) cycle. Overview of Published Methods of Using Cold Thermal Energy Storage in the VCR Cycle A refrigerator cycle is a predetermined sequence of certain processes; therefore, it is important to choose a rational location for introducing the cold thermal energy storage in the cycle. Thus, when implementing cold thermal energy storage in the VCR in the pump channel between the compressor and the condenser [2], an increase in the coefficient of performance by 6% in comparison with a traditional refrigerator is provided. By placing heat thermal energy storages around the condenser tubes of a household refrigerator [3], the power consumption of the refrigerator decreased by 12%. Bauman Moscow State T
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