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MM321 Refrigeration and Air Conditioning
The University of the South Pacific School of Engineering and Physics MM 321 – Refrigeration and Air Conditioning Lab 2: Vapor Compression Refrigeration System Name: Name: Jowesh Avisheik Goundar ID: ID: S11076586
AIM To determine the coefficient of performance (COP) of a vapor compression refrigeration cycle.
EQUIPMENT o
Cussions Refrigeration Unit
INRODUCTION Due to many of the impracticalities associated with the reversed Carnot cycle, it became essential to modify it so that it can become more practical and functional. Therefore, a resulting cycle developed known as vapour compression refrigeration cycle in which the impracticalities of reversed Carnot cycle were eliminated by vaporizing the refrigerant completely before it is compressed and by replacing the turbine with a throttle valve/expansion valve. This cycle is most widely used for refrigerators, air conditioning systems and heat pumps. The schematic of the cycle is shown in fig. 1. [1]
Figure 1: Schematic Diagram for Vapor Absorption Cycle [2] The coefficient of performance (COP) for a refrigeration cycle is defined as the ratio of the rate of heat transfer from the refrigerated space to the power supplied to the refrigeration cycle. This can be expressed as: ̇ ̇ Thus, in this experiment it is required to determine the COP of the vapor compression refrigeration cycle. Lab 2: Vapor Compression Compression System
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MM321 Refrigeration and Air Conditioning EXPERIMENTAL SET-UP
Figure 2: Schematic Diagram for the refrigeration circuit
RESULTS AND DISCUSSION Following results were obtained from the refrigeration unit: Pressure Condenser = 5 Bar Pressure Evaporator = 1 Bar Mass flow rate of the refrigerant = 0.04kg/s Power input compressor = 1.5kW
Corresponding to these temperatures and with reference to Pressure-Enthalpy Diagram [Arcton 12], the enthalpy values were noted and tabulated as in table 1. Table 1: Results for Temperature and its corresponding Enthalpy Point
Temperature [K]
Enthalpy [kJ/kg]
1` 2` 3 4
293 352 311 271
267 303 116 116
Lab 2: Vapor Compression System
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MM321 Refrigeration and Air Conditioning
Figure 2: Pressure-Enthalpy diagram to obtain enthalpy values with respective temperature Calculations: Compressor Power:
MM321 Refrigeration and Air Conditioning DISCUSSION From the results it was noted that the refrigeration cycle obtained a COP of 4.19. COP indicates the ratio of the heat transferred from the refrigerated space to the work supplied to the cycle (by the compressor). Thus, the greater the COP the better and more efficient the system is, and since the COP for this system was found to be 4.19, indicated that the system is quite effective and efficient. The compressor used in this system had a power capacity of 1.5kW, and from the analysis it was found that to successfully remove heat, the system requires power input of 1.44kW, therefore, this indicated that the result and analysis was quite proficient and acceptable.
CONCLUSION From this experiment, the practical aspect of the refrigeration cycle was observed and using the theory of vapor compression refrigeration cycle the coefficient of performance (COP) of this refrigeration cycle was calculated. Comparing the calculated data with the experimental data showed fairly good results. It was also observed that the greater the COP is the efficient the system becomes as the heat transfer from the refrigerated space increases to the work input to the system.
REFERENCE [1] Ahmed, D. M. (2013). Vapor Compression refrigeration Cycle. In MM321 Refrigeration and Air Conditioning.
[2] HubPages.Inc. (2010, January 16). What is Vapor Compression Refrigeration System. Retrieved August 17, 2013, from Hub Pages: http://ninjacraze.hubpages.com/hub/What-is-Vapour-Compression-RefrigerationSystem .
