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Performance Analysis of a Refrigeration System Using Nano Fluid 463 3.3 Observations Table 1: Observations from the refrigeration test rig. Observation Initial temp of water ( ̊C) Final temp. of water ( ̊C) Initial energy meter reading (kWh) Final energy meter reading (kWh) Pressure at comp. inlet (lb/in2) Pressure at comp. Outlet (lb/in2) Pressure before throttling(lb/in2) Pressure after throttling(lb/in2) Temp. at compressor inlet ( ̊C) Temp. at compressor outlet( ̊C) Temp.beforethrottling( ̊C) 46 Temp.afterthrottling( ̊C) 9 5 Mass of water (kg) 12 12 Capillary tube Solenoid Valve 31 31 10 696.8 697 45 190 190 45 7 55 11 697 697.2 35 190 190 35 10 65 41 3.4 Results Table 2: Results from the refrigeration test rig. COP Capillary Tube Solenoid Valve COPcarnot 5.73 4.89 COPtheoretical 4.04 3.2 COPactual 1.463 1.39 Refrigeration Effect (kJ) 1053.36 1003.2 3.5 Conclusions Capillary tube can be preferred over solenoid valve as an expansion device. Refrigeration effect can be enhanced in the evaporator.To enhance the refrigeration effect, We should use a better refrigerant. We can use nano particles – Cuo. We can improve the heat transfer coefficient in a designed evaporator section. 4. Analysis of Evaporator Test Section The evaporator test section considering here is a double pipe heat exchanger. The test section, evaporator is a straight horizontal tube in tube heat exchanger as shown in Fig. 2 which has a length of 1400 mm with inner tube made of copper having an outer diameter of 9.52 mm and inner diameter 7.72 mm. The refrigerant flows through the inner tube and the hot water used to evaporate the refrigerant flows through the annulus. The outer tube is made of copper having an outer diameter of 19.05 mm and inner diameter of 17 mm. the hot water flows around the refrigerant tube in counter direction and represents the load on the evaporator.PDF Image | Performance Analysis of a Refrigeration System Using Nano Fluid
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