# 1 record pressures temperatures and compressor power

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(1) Record pressures, temperatures and compressor power for both modes: normal capillary and normal expansion. See the enclosed data sheet. (2) Identify the various components of the cycle and trace a P-h diagram. Indicate on the P-h diagram the pressures and temperatures you measured for the calculation of COP. (3) Calculate the COP of the cycle for each mode and compare them. (4) Briefly discuss the limitations of the system compared to real refrigeration systems in buildings. Note: The lab instructor will explain about the apparatus and the way to operate and control it to measure the variables.
- 8 - Figure 1: Hampden RST-6 Refrigeration System Trainer
- 9 - Figure 2: Location of Switches, Valves, Pressure Gauges and Thermocouples in Hampden RST-6 Refrigeration System Trainer
- 10 - Figure 3: laboratory heat pump
- 11 - Table 1: List of Components of the Laboratory Heat Pump No Name Function 1 thermocouple Temperature out of compressor 2 thermocouple Temperature into condenser 3 thermocouple Temperature out of condenser 4 thermocouple Temperature into evaporator 5 thermocouple Temperature out of evaporator 6 thermocouple Temperature into compressor 7 pressure gauge Pressure out of compressor 8 pressure gauge Pressure into condenser 9 pressure gauge Pressureout of condenser 10 pressure gauge Pressure into evaporator 11 pressure gauge Pressure out of evaporator 12 pressure gauge Pressure into compressor 13 reversing valve Reverses direction of flow in the system 14 sight glass Indicates vapor flow into condenser 15 sight glass Indicates liquid flow out of condenser 16 valve controls flow to reserve Freon tank 17 reserve tank contains reserve supply of Freon 414 18 valve controls flow from reserve Freon 414 tank 19 valve controls by-pass around Freon 414 tank 20 filter dryer Filters and dries Freon 414 liquid 21 flow meter Indicztes flow of liquid Freon 414 (lbs/min) 22 sight glass Indicates flow and detects moisture 23 valve controls flow to cooling capillary tube 24 Capillary tube Reduces liquid pressure in the cooling cycle 25 valve controls flow to thermostatic valve 26 thermostatic valve Reduces liquid flow into evaporator 27 sight glass Indicates liquid flow into evaporator 28 sight glass Indicates vapor flow out of evaporator 29 valve controls flow from evaporator to compressor 30 valve controls flow to liquid trap accumulator 31 accumulator Traps liquid freon before entering the compressor 32 valve controls vapor flow from liquid trap 33 valve controls flow to reserve oil reservoir 34 accumulator reserve oil reservoir 35 valve controls oil flow from reservoir to compressor pump 36 sight glass Indicates oil level in the compressor 37 valve controls flow to heating cycle capillary 38 Capillary tube Reduces liquid pressure in heating cycle 39 pressure control controls range and differential pressure in the evaporator (low side) and Controls maximum pressure in the compressor (high side)
- 12 - Data reading from Hampden refrigeration system trainer: MODE Phigh Plow P3 P4 T1 T2 T3 T4 T5 T6 TEV Control Capillary Control TEMPERATURE (°C)