High and low temperature test chamber oil separator:
The oil separator can recirculate most of the compressor oil that is taken out from the compressor exhaust port. A small part of the oil is circulated through the system to be recirculated by the compressor suction port together with the refrigerant. Chang will gradually collect oil in the system, which will still cause the heat exchange efficiency to drop, and the compressor lacks oil and other faults.
High and low temperature test chamber accumulator:
The accumulator is such that the refrigerant that is not condensed in the refrigeration system does not enter or enter the circulation system, thereby improving the heat exchange efficiency, but at the same time, the refrigerant charge is increased. The problem of low condensing pressure, for small systems, the circulation flow is not large, and it is completely possible to achieve the purpose of effluent through the pipeline processing technology.
High and low temperature test chamber evaporation pressure regulating valve:
Evaporative pressure regulating valves are generally used in dehumidification systems to control the evaporation temperature so that the evaporator does not frost. However, in the unipolar circulation system, the use of the evaporating pressure regulating valve is connected to the regenerative return air solenoid valve, which complicates the structure of the pipeline and is not conducive to smooth system. At present, most of the test chambers are not equipped with an evaporation pressure regulating valve.
High and low temperature test chamber heat exchanger:
The heat exchanger has three advantages. One is that the condensed refrigerant can be supercooled, and the amount of pre-gasification can be reduced in the pipeline. Second, the return gas refrigerant can be fully vaporized to reduce the risk of liquid hammer. The third is to improve system efficiency. However, the access of the heat exchanger complicates the system. If the pipeline layout is not pay attention to the process, it will increase the tube loss, which is not conducive to the company's product configuration for small batch production.
High and low temperature test chamber check valve:
Since the system is used in multiple circulating branches, a check valve is installed at the return port of the unoperated circulating branch to prevent the refrigerant from flowing back into the unoperated circulating space. If the gas accumulation in the pipeline does not affect the system operation, it is considered to prevent liquid accumulation. Therefore, not all sub-circuits are equipped with a check valve.
High and low temperature test chamber gas-liquid separator:
For the refrigeration system of the loop test equipment with variable working conditions, the gas-liquid separator is one of the effective means to avoid liquid blow, and the cooling capacity can be adjusted appropriately, but the gas-liquid separator also cuts off the system oil return. An oil separator must be installed to install the gas-liquid separator. For the unit consisting of a fully enclosed compressor, since there is a very good buffer space in the return air port, it can play a certain gasification, so the gas-liquid separator can be omitted. For units with limited installation space, a hot bypass can be provided to vaporize excess liquid return.
High and low temperature test chamber cooling PID control:
The cooling PID control has a significant effect on the operation of energy saving. Not only that, in the normal temperature range where the thermal equilibrium mode temperature field index is relatively poor, the cold PID control can achieve the ideal index. The cooling PID control has two kinds of time ratios and opening ratios. The time ratio is the ratio of controlling the cooling solenoid valve to break in one time period, and the opening ratio is controlling the conduction amount of the electronic expansion valve.
The oil separator can recirculate most of the compressor oil that is taken out from the compressor exhaust port. A small part of the oil is circulated through the system to be recirculated by the compressor suction port together with the refrigerant. Chang will gradually collect oil in the system, which will still cause the heat exchange efficiency to drop, and the compressor lacks oil and other faults.
High and low temperature test chamber accumulator:
The accumulator is such that the refrigerant that is not condensed in the refrigeration system does not enter or enter the circulation system, thereby improving the heat exchange efficiency, but at the same time, the refrigerant charge is increased. The problem of low condensing pressure, for small systems, the circulation flow is not large, and it is completely possible to achieve the purpose of effluent through the pipeline processing technology.
High and low temperature test chamber evaporation pressure regulating valve:
Evaporative pressure regulating valves are generally used in dehumidification systems to control the evaporation temperature so that the evaporator does not frost. However, in the unipolar circulation system, the use of the evaporating pressure regulating valve is connected to the regenerative return air solenoid valve, which complicates the structure of the pipeline and is not conducive to smooth system. At present, most of the test chambers are not equipped with an evaporation pressure regulating valve.
High and low temperature test chamber heat exchanger:
The heat exchanger has three advantages. One is that the condensed refrigerant can be supercooled, and the amount of pre-gasification can be reduced in the pipeline. Second, the return gas refrigerant can be fully vaporized to reduce the risk of liquid hammer. The third is to improve system efficiency. However, the access of the heat exchanger complicates the system. If the pipeline layout is not pay attention to the process, it will increase the tube loss, which is not conducive to the company's product configuration for small batch production.
High and low temperature test chamber check valve:
Since the system is used in multiple circulating branches, a check valve is installed at the return port of the unoperated circulating branch to prevent the refrigerant from flowing back into the unoperated circulating space. If the gas accumulation in the pipeline does not affect the system operation, it is considered to prevent liquid accumulation. Therefore, not all sub-circuits are equipped with a check valve.
High and low temperature test chamber gas-liquid separator:
For the refrigeration system of the loop test equipment with variable working conditions, the gas-liquid separator is one of the effective means to avoid liquid blow, and the cooling capacity can be adjusted appropriately, but the gas-liquid separator also cuts off the system oil return. An oil separator must be installed to install the gas-liquid separator. For the unit consisting of a fully enclosed compressor, since there is a very good buffer space in the return air port, it can play a certain gasification, so the gas-liquid separator can be omitted. For units with limited installation space, a hot bypass can be provided to vaporize excess liquid return.
High and low temperature test chamber cooling PID control:
The cooling PID control has a significant effect on the operation of energy saving. Not only that, in the normal temperature range where the thermal equilibrium mode temperature field index is relatively poor, the cold PID control can achieve the ideal index. The cooling PID control has two kinds of time ratios and opening ratios. The time ratio is the ratio of controlling the cooling solenoid valve to break in one time period, and the opening ratio is controlling the conduction amount of the electronic expansion valve.
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