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(1). The refrigerant flows over an oil separator (12) before entering the condenser to ensure that the refrigerant is not contaminated by the lubricating oil used in the compressor. At the inlet of the condenser a specific amount of oil is mixed with the desired amount of CuO and introduced into the refrigerant line by gravity, and mixes with the refrigerant then this mixture flows through the condenser to the expansion valve (6), in which the mixture is throttled to the evaporator where it evaporates using hot water. The hot water flows around the refrigerant tube in counter direction and represents the load on the evaporator. The hot water loop consists of hot water tank (15) which includes electric heater (14) and pump (16). The compressor used in the present test rig is sealed hermetic reciprocating type of 1 HP, 220 Volts and 50 Hz. The test section, evaporator is a straight horizontal tube in tube heat exchanger as shown in Fig. 1 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. Fig. 1: A schematic diagram for the experimental test rig 3. Experimental Measurements and Instrumentation The temperatures are measured in the different parts of the experimental test rig using thermocouples type "T", which are connected to a digital indicator which is provided with selector switch to record the temperature at the desired locations. An interface is provided to record the thermocouples readings within temperature range of 1.3 to 35 oC with a resolution of 0.1 oC. Thirteen thermocouples are used to measure the temperatures at different locations along the test rig. Nine of these thermocouples are distributed on the test section (evaporator). Refrigerant pressure is measured in the test rig by four pressure gauges, two of them are connected to the high pressure side of the refrigeration cycle. The first one is connected to the discharge tube of the compressor, and the other of the flow-meter inlet. These two gauges have a pressure range from 0 to 1 bar. The other two gauges are connected to the low pressure side of the refrigeration cycle; 81PDF Image | Heat Transfer Analysis of Vapor Compression System Using Nano Cuo-R134a
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