Refrigeration & Air Conditioning Lab


RAC-101         Refrigeration Test Rig
RAC-103         Ice Plant Trainer
RAC-105         Water to Air Heat Pump

RAC-102         Air Conditioning Test Rig
RAC-104         Water to Water Heat Pump
RAC-106         Electrolux Refrigeration Test Rig

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The main components of the air conditioning system are the air cooler with condensing unit, fan, steam humidifier and air heater. Motorised ventilation flaps control the air distribution in the air conditioning system. The climatic chamber is equipped with different heat sources (wet and dry). Temperature and relative humidity are measured at relevant points in the air duct and displayed digitally. For the refrigeration circuit two manometers with integrated temperature scale and a flow meter provide all relevant measurements. All the measurements can be read through digital displays. With the help of data acquisition sys-tem and with the help of software provided , data logging of all the measurements can be done via USB interface to PC. Graphical analysis and real time measurement is possible through the soft-ware provided.


The trainer consist of two compressors connected in series, with each compressor only having a relatively low pressure ratio. This makes a more favorable dimensioning of the low pressure stage compressor possible. lntercooling provided between the low pressure compressor (LP) and the high pressure compres­sor (HP) reduces the outlet temperature of the HP compressor and improves the efficiency of the compression. The trainer also has the provision of injection intercooling. A small amount of liquid refrigerant is injected from the receiver into the outlet line of the LP compressor. The liquid refrigerant evapo­rates and thus cools the intake gas for the HP compressor. Via an add-on heat exchanger in the in­jection cooler the supercooling of the liquid refrigerant can be increased upstream of the expan­sion valve. This allows for an increase in the evaporator capacity. Valves allow for the injection intercooling or the heat exchanger for refrigerant supercooling to be switched off. This can demonstrate their effect on the system. All measured values such as temperature for different stages , drive power, load power are record­ed by sensors and displayed on digital displays.


The experimental unit generates cold and hot air with the aid of ordinary compressed air. The central element of the experimental unit is a vortex cooling device also known as a vortex tube. In the vortex tube the tangentially incoming compressed air is moved in rapid rotation. This creates a cold and hot air flow in the vortex tube which leaves the vortex tube at opposite ends. A vortex cooling device does not have any moving parts, is maintenance-free and immediately ready for operation. The vortex cooling device is used for the convective cooling of high-speed tools, the air conditioning of protection suits and the cooling of switch cabinets. It is particularly suited for use in explosive environments. One benefit here is that the vortex cooling device does not require an electric power supply. The inlet pressure is measured using a manometer. The compressed air volume and the outlet volume of the hot air flow are each measured using a rotameter. The inlet temperature of the compressed air and the outlet temperatures of the cold and hot air flows are displayed digitally.

RAC-101 Vapour Compression Test Rig

The trainer examines a refrigeration circuit under an adjustable load. The refrigeration circuit consists of a compressor, a condenser with fan, a thermostatic expansion valve and a coaxial coil heat exchanger as evaporator. A water circuit serves as load, consisting of a tank with a heater and a pump. The temperature in the tank is adjusted at a controller. The purpose of this refrigeration circuit is the production of cold water. The water flows through the jacket of the coaxial coil heat exchanger, transfers heat to the refrigerant and thereby cools down. All relevant measured values are recorded by sensors and displayed on the digital displays



Heat pump & the refrigeration machine basically work on one and the same principle and with the same components. Heat pump is a machine, which deliver heat at a temperature suitable for domestic, industrial & commercial purpose. By added work input from the motor or engine it extract heat from low grade sources. In many circumstances heat pumps can make valuable contribution to energy conservation. The majority of heat pump operate on the vapour compression cycle using a refrigerant as the working fluid. Heat pump is fully sealed R-134A refrigerant system using water to water pumping principle the equipment produce realistic results and has low thermal inertia so that unit stabilize very quickly and enables student’s maximum experimentation’s.


The unit enables the student to study the basic principles of ice plant cycle within a short period. The test rig is designed for the study thermodynamics of vapour compression refrigeration cycle by the way of demonstration & experimentation. It has the facility to measure various parameters for the experimentation & demonstration. Ice cans are kept in liquid tank, which is cooled by the refrigerant evaporator. As convectional ice plant can take 12 to 24hours to complete the cycle, this ice plant is specially designed to demonstrate process of ice information to be complete with in period of 4 hours & hence it is most suitable for laboratory use .


Air condition test rig unit is required to conduct experiments and demonstrate the process of cooling of atmospheric air. The unit will be fitted with all instruments facilities so that temperature, pressure etc. may be measured at different points in the air conditioning system.


The setup demonstrates the student about the basic principal of refrigeration cycle. The test rig is designed for the supply of thermodynamics of vapor compression refrigeration cycle by way of demonstration & experimentation. It has facility to measure various parameters for experimentation.