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What is Coefficient of Performance

Chapter 6
Handbook of Research on Advances and Applications in Refrigeration Systems and Technologies
Expresses the ratio between the energetic objective of the refrigeration cycle and the quantity of energy provided to the system to comply the energetic objective of the cycle.
Published in Chapter:
Current and Future Trends of Refrigerants Development
M. V. Duarte (University of Beira Interior, Portugal), L. C. Pires (University of Beira Interior, Portugal), P. D. Silva (University of Beira Interior, Portugal), and P. D. Gaspar (University of Beira Interior, Portugal)
Copyright: © 2015 |Pages: 53
DOI: 10.4018/978-1-4666-8398-3.ch006
Abstract
In this chapter is addressed the thematic of refrigerants: its historical evolution; properties; legislation applied in the area and future trends. The first refrigerant being marketed on a large scale was ethyl ether (R610), in 1834. Since then, the evolution of the utilized refrigerants was stimulated, initially due to constructive issues in the refrigeration system and later to environmental issues. This evolution may be divided into four generations: 1st use of any fluid that worked; 2nd safety and durability of the equipment; 3rd ozone layer protection and 4th increase of global warming concerns. During the process of evolution many refrigerants were tested to understanding of their properties. Currently, environmental concerns are taken as guide in the search for new refrigerants. The most promising refrigerants to be used in future are the HFEs, HFOs and HFCs with low-GWP, natural refrigerants and blends between (HCs/HFCs and HFCs/HFOs) refrigerants.
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Chapter 7
Retrofitting of R404a Commercial Refrigeration Systems with R410a and R407f HFCs Refrigerants
Index to assess the performance of a refrigeration system or a heat pump. It is defined as the ratio between the useful effect (refrigeration effect or heating effect) and the the work input.
Published in Chapter: Retrofitting of R404a Commercial Refrigeration Systems with R410a and R407f HFCs Refrigerants; From: Handbook of Research on Advances and Applications in Refrigeration Systems and Technologies
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Chapter 4
Multi-Objective Optimization of Two-Stage Thermo-Electric Cooler Using Differential Evolution: MO Optimization of TEC Using DE
Or COP of a heat pump is a ratio of heating or cooling provided to electrical energy consumed. Higher COPs equate to lower operating costs. The COP may exceed 1, because it is a ratio of output – loss, unlike the thermal efficiency ratio of output – Input energy. For complete systems, COP should include energy consumption of all auxiliaries. COP is highly dependent on operating conditions, especially absolute temperature and relative temperature between sink and system, and is often graphed or averaged against expected conditions.
Published in Chapter: Multi-Objective Optimization of Two-Stage Thermo-Electric Cooler Using Differential Evolution: MO Optimization of TEC Using DE; From: Handbook of Research on Computational Simulation and Modeling in Engineering
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Chapter 5
Ejection Refrigeration Cycles
Ratio of the cooling capacity of the system to the motive power.
Published in Chapter: Ejection Refrigeration Cycles; From: Handbook of Research on Advances and Applications in Refrigeration Systems and Technologies
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