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  Refrigeration and Air Condition

  Gas Heated Absorption Refrigeration Unit

  Unlike mechanically driven compression refrigeration systems, absorption systems use thermal energy directly. There are three circuits in the system a water circuit, an ammonia circuit and a hydrogen circuit. The system comprises a generator, a condenser, an evaporator with a downstream gas heat exchanger, an absorber and a liquid heat exchanger. The generator is heated with gas not electricity. The unit can therefore be operated independent of the mains electricity.

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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

  Refrigeration Technology Demonstration Panel

  The system is designed for the demonstration of the cyclic process on the p-h state diagram. The experimental set-up is clearly arranged on a metal panel with a system schematic. The use of commercially available components such as a finned pipe condenser and coaxial evaporator ensure a high degree of relevance to practice. A cooling load can be applied to the evaporator using water connections. Instruments enable the processes in a cooling system to be investigated and the energy transfers balanced.

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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.