Control method of temperature shock test box

Cooling system for temperature shock test box:

1. Refrigeration system and compressor: In order to ensure the cooling rate and minimum temperature requirements of the test box, this test box uses a binary cascade water-cooled refrigeration system composed of a set of imported German Copeland semi-closed compressors. The cascade cooling system includes a high-temperature refrigeration cycle and a low-temperature refrigeration cycle, and the connecting container is an evaporative condenser. The evaporative condenser is also used for energy transfer, and the heat energy in the working room is transferred out through the two-stage refrigeration system to realize the temperature rise the goal of. The design of refrigeration system uses energy regulation technology, an effective processing method can not only ensure the normal operation of the refrigeration unit but also effectively adjust the energy consumption and cooling capacity of the refrigeration system, so that the operating cost of the refrigeration system And the failure rate dropped to a more economical state.

2. Refrigeration working principle: the high and low refrigeration cycle adopts reverse Carro cycle, which is composed of two isothermal processes and two adiabatic processes. The process is as follows: the refrigerant is adiabatically compressed by the compressor to a higher pressure, which consumes work to increase the temperature of the exhaust gas, and then the refrigerant exchanges heat isothermally with the surrounding medium through the condenser, and transfers the heat to the surrounding medium. After the refrigerant adiabatically expands to work through the valve, the refrigerant temperature decreases. Finally, the refrigerant absorbs heat isothermally from the object with a higher temperature through the evaporator, thereby lowering the temperature of the object to be cooled. This cycle is repeated to achieve the purpose of cooling.

3. Refrigerant: adopt DUPONT R502 (high temperature cycle), R23 (low temperature cycle);

4. Auxiliary parts: expansion valve (US SPORLAN), solenoid valve (Italy CASTEL); filter (US SPORLAN); pressure controller (UK-US RANCO); oil separator (European and American ALCO) and other refrigeration accessories are imported.

Air conditioning system of temperature shock test chamber

Air conditioning method: forced ventilation and internal temperature regulation (BTC). This method means that under the condition of continuous operation of the refrigeration system, the control system automatically calculates the output of the output through the PID to control the output of the heater according to the set temperature point, and finally reaches a dynamic balance.

1. Air circulation device: built-in air-conditioning room, circulation air duct and long-axis centrifugal fan, use efficient refrigerator and energy adjustment system, and exchange effectively through high-efficiency fan to achieve the purpose of temperature change. By improving the air flow, the air flow rate and heat exchange capacity with the heater and the air cooler are increased, thereby greatly improving the temperature uniformity of the test chamber.

2. Heating method: high quality nickel-chromium alloy electric heater;

3. Air cooling method: Multi-stage diaphragm air heat exchanger

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