1. Refrigeration principle:

In order to ensure stable operating temperature within the required parameter range, the chiller used for high and low temperature testing provides cooling or heating capacity to the high and low temperature testing chamber. The refrigeration principle is to compress the refrigerant into a high-temperature and high-pressure gas (using electricity to drive the compressor to work) inside the compressor. The high-temperature and high-pressure gaseous refrigerant is discharged from the compressor exhaust port to the condenser, and the refrigerant is carried away by the condensate water on the cooling water side in the condenser, thereby achieving the condensation of high-temperature and high-pressure refrigerant into a medium temperature and high-pressure liquid refrigerant. The condensed refrigerant is throttled and depressurized by a throttling device to enter the evaporator for evaporation. The refrigerant evaporates and absorbs heat in the evaporator, reducing the temperature of the chilled water on the water side of the evaporator and displaying the effect of producing cold water. The refrigerant undergoes sufficient heat absorption and evaporation in the evaporator before being sucked into the compressor through the suction port. Compressing and continuously repeating the cycle, the refrigeration system continuously outputs the cooling capacity to the refrigerant carrier through this series of reciprocating cycles, and then the refrigerant carrier source is continuously transported by the circulation pump to the place where cooling is needed for cooling.

2. The operation steps of the chiller unit in the high and low temperature test chamber:

1) Turn on the power of the high and low temperature test chamber and ensure that the equipment is in standby mode.

2) Open the chiller control panel and select the cooling or heating mode.

3) Set the desired target temperature and adjust the refrigerant flow rate as needed.

4) Press the start/stop button to start the cooling or heating process.

5) Observe and record the operating status of the equipment, including parameters such as refrigerant pressure, temperature, flow rate, etc; Usually, the temperature control for integrating cold and hot is between -70 ℃ and+150 ℃.