Refrigeration cycle experimental apparatus
This is a tabletop refrigeration system using refrigerant R134a. You will learn about the pressure-enthalpy diagram (p-h diagram) and derive subcooling and superheating, as well as the coefficient of performance (COP) from the enthalpy changes. The refrigeration circuit is equipped with high and low-pressure gauges, pressure switches, a thermal expansion valve, a sight glass, and a dryer. The evaporator coil (evaporator) and condenser coil (condenser) submerged in a water tank accurately collect temperature changes and clearly demonstrate the heat pump. The water in the tank is circulated by a pump to maintain a steady state. The high and low pressures and temperatures of each component are digitally displayed on the control panel's LCD display, and various data can be displayed and collected on a PC (sold separately) using the included VDAS software. The compressor inlet temperature, thermal expansion valve inlet temperature, and low and high pressures are used to plot the p-h diagram, calculate cooling effect and heating effect (kJ/kg), compressor work (kJ/kg), COPc cooling coefficient, COPh heating coefficient, degree of subcooling (K), degree of superheating (K), and more.
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basic information
EC1500V Specifications Dimensions and Weight: 825 x 500 x H845mm, approximately 58kg Power Supply: Single-phase AC100V 5A or AC200V 3A 50/60Hz Water Supply: 7L (approximately 20℃ to 23℃), clean water (distilled water or purified water recommended) Compressor: Fully enclosed reciprocating type Horsepower: 1/8HP Displacement: 4cm3 Refrigeration Capacity: 329W Condenser: Outer diameter 1/4“ coil pipe - 12 turns, copper, heat transfer area 0.052m2 Evaporator: Outer diameter 3/8“ coil pipe - 9 turns, copper, heat transfer area 0.063m2 Refrigerant: R134a, HFC, boiling point -26.4℃ (atmospheric pressure 101.3kPa) Expansion Valve: Internal equal pressure type Pressure Switch: Low pressure side pressure 1bar, on/off pressure difference 1bar; high pressure side pressure 15bar, on/off pressure difference 4bar Temperature Measurement: 6 K-type thermocouples (compressor inlet and outlet, expansion valve inlet, inside water tank) Manometers: 2 (for high pressure and low pressure) Pressure Sensors: 2 (for high pressure and low pressure)
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Applications/Examples of results
Main Experimental Content (Reference) Experiment 1 Demonstration of Heat Pump Cycle and Performance Analysis (Water Pump ON) Experiment 2 Relationship Between Temperature and Pressure (Water Pump OFF) Experiment 3 Performance of Heat Pump Cycle with Different Heat Sources and Heat Sink Temperatures (Reoperation after Warm-Up, Water Pump OFF) Experiment 4 Determination of Compressor Adiabatic Efficiency and Volumetric Efficiency (Reoperation after Warm-Up, Water Pump ON ⇒ OFF) Experiment 5 Comparison of Performance Between Vapor Compression Refrigeration and Reverse Carnot Cycle (Reoperation after Warm-Up, Water Pump ON ⇒ OFF)
Detailed information
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Custom calculation formula input and layout changes are possible. VDAS software screen.
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VDAS software p-h diagram screen
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Device circuit diagram
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Phase change of refrigerant
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Megakemu designs, manufactures, and imports various experimental and practical equipment for universities, junior colleges, technical colleges, high schools, and vocational schools nationwide. While the world has made advancements in various fields, it seems that our Earth's environment is being disturbed by ourselves and is approaching its limits. The world is seeking new Japanese technologies that coexist with the Earth's environment.