Influence of Condensing Temperature Variation on Vapor Compression Refrigeration System

2024-09-14

The main factors (non-fault factors) affecting the operating conditions of vapor compression refrigeration systems include the degree of subcooling of the refrigerant liquid before throttling, the degree of superheat of the vapor inhaled by the compressor, and changes in condensation temperature and evaporation temperature.

Influence of Condensing Temperature Variation on Vapor Compression Refrigeration System1726287839145

(I). Impact of changes in condensation temperature - When the evaporation temperature remains unchanged and the condensation temperature rises, the following changes occur:

The condensation pressure increases.
The exhaust temperature rises.
The refrigerating capacity per unit mass decreases, the theoretical power consumption per unit increases, and the refrigerating capacity per unit volume decreases.
For a refrigeration system, when the compressor's gas delivery remains unchanged, since the suction mass volume remains unchanged and the refrigerant circulation will not change, so the refrigerating capacity of the refrigerator will decrease and the theoretical power consumption of the compressor will increase.
(II). Impact of changes in condensation temperature - When the evaporation temperature remains unchanged and the condensation temperature drops, the following changes occur:
The condensation pressure decreases.
The exhaust temperature drops.
The refrigerating capacity per unit mass increases, the theoretical power consumption per unit decreases, and the refrigerating capacity per unit volume increases.
For a refrigeration system, when the compressor's gas delivery remains unchanged, since the suction mass volume remains unchanged and the refrigerant circulation will not change, so the refrigerating capacity of the refrigerator will increase and the theoretical power consumption of the compressor will decrease.