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  Refrigeration and Air Condition

  Oil Return in Refrigeration Systems

  The unit addresses the problem of oil return in refrigerant circuits. In refrigerant circuits the lubricant is carried through the pipe system by the refrigerant. Oil may impact the compressor if the system is overfilled. If the system is underfilled the compressor may run dry. The selection of the correct diameter and arrangement of pipework is therefore of key importance. The effect of the refrigerant flow rate on the oil return to the compressor is demonstrated on this unit with the aid of glass intake pipes. A complete refrigerant circuit is mounted on the rear of the demonstration panel. To demonstrate the effect of different pipe diameters and routing, individual sections can be selected using ball valves. Pressures and flow rates are measured in the refrigerant circuit. The laboratory trolley mounted system is flexible and suitable for use in different seminar or training rooms.

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  Refrigeration and Air Condition

  Set of Training Panels Expansion

  Consists of 15 different training panels that can be mounted modularly on the basic unit. These panels enlarge the scope of experiments of realised with the basic unit, training panels included in and accessories in comprises more complex refrigerant components as capacity controller, suction pressure controller, defrost timer, four-way reversing valve and case controller. A four-way reversing valve is used to reverse the cycle. A frozen evaporator can be defrosted with a reversed cycle. The evaporator is then temporarily used as a condenser.

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  Refrigeration and Air Condition

  Single Chamber Refrigerator Module

  The experimental set-up is clearly arranged on a metal board which is placed on the base unit. The pipe connection between base unit and auxiliary module is made via self-locking Schrader valves. The individual components of the unit, in this case temperature control, fans, heater, compressor and solenoid valves, are controlled by the software (included in the scope of supply of the base unit). The refrigerating capacity is generated by an evaporator in an enclosed chamber. A blower is used to help achieve the even distribution of temperatures in the chamber. In addition, a heater can be used to simulate a cooling load. Solenoid valves permit the operation of the unit with a capillary tube or with an expansion valve as the expansion element.

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  Refrigeration and Air Condition

  Vapour Compression Refrigeration Cycle

  A simple refrigeration circuit is demonstrated with this clearly laid out benchtop unit. The evaporation and condensation processes are easily observed through the glass components. The function of the expansion valve (in the form of a float valve) can be seen. The changes in the refrigerant state can also be followed by measuring pressures and temperatures. A special environmentally friendly refrigerant is used at low pressure.