Phenomenon when the thermal expansion valve does not match the system
How to choose the thermal expansion valve of air compressor
When a mismatch occurs, the refrigerant flow of the system will be more or less, which will result in a situation in which the cooling capacity of the thermal expansion valve is suddenly reduced.
1. When the opening of the thermal expansion valve is too small, the refrigerant supply is insufficient, and there is not enough refrigerant to evaporate in the evaporator, so that the refrigerant evaporates in a manner of flowing in the evaporator tube. Thereafter, no liquid refrigerant evaporates in the evaporator line, only the steam is overheated. Therefore, a considerable number of evaporators fail to fully utilize their efficiency, resulting in insufficient cooling capacity, slow cooling rate, and reduced cooling effect of the air conditioner, which will have a negative impact on system performance.
2. If the opening of the thermal expansion valve is too large, that is, the amount of liquid supplied to the evaporator by the thermal expansion valve is greater than the load of the evaporator, some liquid refrigerant will evaporate in the evaporator and enter the compressor together with the gaseous refrigerant, resulting in Liquid hammer (wet stroke), even cylinder impact accidents, and damage to the compressor. In addition, when the cooling capacity is excessively large, oscillation is caused, and excessive liquid is intermittently supplied to the evaporator, causing the suction pressure of the compressor to fluctuate drastically. At the same time, the opening of the thermal expansion valve is too large, which increases the evaporation temperature, reduces the cooling capacity, increases the power consumption of the compressor, and increases the power consumption.
