The Introduction to Refrigeration Unit, "TIR", is a system with exchangeable modules in which the components are mounted on plates and quickly connected by flexible hoses.

The unit consists of a frame with a compressor, a refrigerant accumulator tank to ensure an adequate flow of refrigerant in the circuit and a liquid separator to prevent liquid from entering the compressor. Six exchangeable modules can also be placed in the frame at the same time and allow for the construction of simple compression refrigeration systems, connecting the modules and elements by cables and flexible hoses.

The modules are formed by the components mounted on plates and are ready to be easily mounted on the frame.

The experimental unit includes all the components required for a fully operational refrigeration circuit, such as compressor, condenser, evaporator and a capillary tube as expansion element. Other additional accessories in refrigeration systems are also included: double pressure control and manometers to protect the compressor against too high or too low pressure, flow meter, sight glass and filter.

The unit allows for different combinations of components, since there are two condensers and two evaporators, one acting as an air-refrigerant heat exchanger and the other as a water-refrigerant heat exchanger.

The frame contains a control and indication panel where the power absorbed by the compressor is displayed and where the compressor and the different fans can be controlled.

Pressures, flow rates and power consumption of the compressors are displayed as the most important characteristic variables of refrigeration circuits. Temperature is measured with thermometers belonging to the laboratory.

To fill and drain the system, the T/KIT1 accessory, Maintenance Kit containing Vacuum Pump, Hoses and Manometers is required.

To repeatedly fill and drain the system without losing the refrigerant, the use of the T/KIT3 Maintenance Kit containing the Refrigerant Filling and Evacuation Module is required.