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CHANGES OF STATE IN THE REFRIGERATION CIRCUIT

Compression refrigeration system a refrigerant flows through the refrigeration circuit and is subject to different changes of state. Here, the physical effect is used that during the transition of the refrigerant from a liquid to a gaseous state energy is required which is removed from the environment (evaporation enthalpy).

The experimental unit represents a typical refrigeration circuit consisting of a hermetic piston compressor, condenser, expansion valve and evaporator. The evaporator and condenser are transparent to provide good monitoring of the phase transition process during evaporation and condensation. The operation of the float valve as expansion valve is also easy to observe. Before the entry into the evaporator the aggregate state of the refrigerant can be monitored at a sight glass. A water circuit cools the condenser or supplies the cooling load for the evaporator. Cold and hot water and refrigerant flows are adjustable. The low pressure level of the refrigerant used permits the use of an evaporator and condenser out of glass. The refrigerant is CFC-free and environmentally friendly.

Temperatures and pressures are recorded and displayed. The key points of the cyclic process can be read and entered into a log p-h diagram. The power of the compressor and flow rates of the water flows and the refrigerant are also indicated.

The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments. The unit shall perform the following experiments and investigations:

Learning Objectives / Experiments

Design and operation of a compression
Refrigeration system
Observe the evaporation and condensation of the refrigerant
Represent and understand the refrigeration cycle in the log p-h diagram
Energy balances
Calculation of the coefficient of performance

Specification

Demonstration of the processes in a refrigeration circuit
For better process monitoring the evaporator and condenser are of transparent design
Evaporator and condenser with pipe coil
Expansion valve in the shape of a float valve
Pressure switch to protect the compressor
Temperature sensor, power meter, manometer in the refrigeration circuit, flow meter for hot and cold water and refrigerant
Safety valves at the evaporator and condenser
Refrigerant Solkatherm SES36, CFC-free

Technical Data

Hermetic piston compressor
Capacity: 18,3cm³
Evaporator capacity: approx. 2800mL
Condenser capacity: approx. 2800mL

Measuring ranges

Temperature: 8x -20...200°C
Pressure: 2x -1...1,5bar
Flow rate (water): 2x 0...48L/h
Flow rate (refrigerant): 1x 0...700L/h
Power: 0...1200W

Dimensions and Weight

LxWxH: 1200x500x900mm
Weight: approx. 110kg

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Changes Of State In The Refrigeration Circuit

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