关键词:

非共沸制冷剂, 冷凝, 传热窄点, 空调工况

Abstract:

The research on heat transfer pinch point (between refrigerant and heat-transfer fluid) was carried out in a condenser with airconditioning operation to investigate the change in temperature difference from condenser inlet to outlet and to avoid the occurrence of pinch pointFirstly, a model of refrigerants condensation was built, and the condition of pinch point occurrence was determinedThe condensation parameters of 15 commonly used refrigerants were decided for standard airconditioning operationSecondly, the equations of state of refrigerants were used to compute and obtain some relationships between temperature and enthalpy and the probability of pinch point occurrence of 15 refrigerants was obtainedLastly, the ranges of temperature difference from condenser inlet to outlet were recommended to avoid the occurrence of pinch point for 10 refrigerantsSuch information might be helpful to choosing refrigerants and adjusting the operation of condenser in airconditioner units.

Key words:

非共沸制冷剂, 冷凝, 传热窄点, 空调工况