Analysis of the basic operation rules of the high and low temperature test chamber

The high and low temperature test chamber oil separator can return most of the compressor lubricating oil brought out from the compressor exhaust port. A small part of the oil needs to pass through the system to return to the compressor suction port together with the refrigerant. Poor oil return to the system will gradually collect oil in the system, which will still cause a decline in heat exchange efficiency and compressor oil shortage.

The accumulator in the high and low temperature test chamber prevents uncondensed refrigerant from entering the refrigeration system or enters the circulation system less, which improves the heat exchange efficiency, but at the same time will increase the refrigerant charge. The problem of low condensing pressure is that for small systems, the circulating flow is not large, and the purpose of liquid accumulation can be completely achieved through pipeline processing technology. National Free Service Hotline

The price of the high and low temperature test chamber is due to the system used in multiple circulation branches. A check valve is installed at the return port of the non-working circulation branch to prevent the refrigerant from flowing back to the non-working circulation space to accumulate. If the gaseous accumulation in the pipeline does not affect the system's operation, it is necessary to consider the prevention of liquid accumulation. Therefore, not all sub-circuits are to be equipped with check valves. Professional manufacturer-Lin Pin, more related product information can be found on our official website:

The gas-liquid separator of the high and low temperature test chamber is one of the effective methods for avoiding liquid shock in the refrigeration system of the ring test equipment with variable operating conditions. At the same time, the cooling capacity can be adjusted appropriately, but the gas-liquid separator The oil return to the system is also cut off, so the oil separator must be installed to install the gas-liquid separator. For the unit composed of fully enclosed compressors, since there is a very good buffer space in the return air port, which can play a certain role in gasification, the gas-liquid separator can be omitted. For units with limited installation space, a thermal bypass can be set to vaporize excess liquid return.

The cold PID control of the high and low temperature test chamber has a significant effect on energy saving in operation. Not only that, in the normal temperature section where the temperature field index of the heat balance mode is relatively poor, the cold PID control can achieve the ideal index. The cooling capacity PID control is divided into two types: time ratio and opening ratio. The time ratio is the ratio of controlling the cooling solenoid valve to open and close within a period of time, and the opening ratio is the conduction volume of the electronic expansion valve. This article comes from the high and low temperature test chamber. The high and low temperature test chamber evaporation pressure regulating valve is generally used in the dehumidification system 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 refrigeration return air solenoid valve, which complicates the pipeline structure and is not conducive to smooth system. At present, most test chambers are not equipped with evaporating pressure regulating valves.

The high and low temperature test chamber heat exchanger has three advantages. First, it can make the condensed refrigerant supercool and reduce the amount of advanced gasification in the pipeline. Second, it can fully gasify the return refrigerant and reduce the risk of liquid blow. The third is to improve system efficiency. However, the access of the heat exchanger complicates the system. If the pipeline layout is not careful about the process, it will increase the pipe loss, which is not conducive to the company's product configuration for small batch production.

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