What effect does the capillary of air conditioning have?

The smaller the capillary diameter and the longer the length, the less refrigerant flow through, the lower the pressure; The larger the diameter and shorter the length of the capillary, the more refrigerant flows through and the higher the pressure. According to the thermal properties of refrigerant, the lower the pressure, the lower the corresponding temperature; The higher the pressure, the higher the temperature. According to this law, if the capillary tube used in the refrigerator freezer is too small or too long, the pressure and temperature of the capillary terminal will be lower, and the corresponding evaporation pressure and temperature will be lower. However, due to the reduction of the flow into the evaporator, the reduction of pressure, resulting in slow evaporation rate, unit volume (time) cooling capacity is reduced, affecting the refrigeration effect. Conversely, if the capillary diameter or length of the refrigerator freezer is too large, the pressure and temperature of the capillary terminal will be higher, and the corresponding evaporation pressure and temperature will be higher. The flow and pressure into the evaporator are increased, although the evaporation rate and unit volume (time) cooling capacity increased, but the refrigeration evaporation temperature is high, the effect is also poor. Capillary is to determine its inner diameter and length according to the refrigeration star class of refrigerator freezer commonly. The refrigeration star is high, the inner diameter of capillary is small, the length is long; The refrigeration star is low, the capillary diameter is large, the length is short.

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