INJECTOR REFRIGERANT CIRCULATION FOR ENHANCING HEAT EFFICIENCY OF AIR COOLERS WITH UNEVEN HEAT LOAD DISTRIBUTION

摘要

A concept of incomplete refrigerant evaporation with overfilling air coolers of air conditioning systems thatleads to excluding a dry-out of inner surface of air coils and is realized through liquid refrigerant recirculation byinjector (jet pump) is developed for air coolers operating at uneven heat load distribution as alternative approachof the heat load modulation through air velocity profile equalizing. A realization of proposed concept allows tosolve the problem of uneven refrigerant distribution in manifolds of heat exchangers (including microchannelheat exchangers) and between refrigerant channels (coils, tubes, microchannel plates) and by uneven outside airheat loads or varying heat loading during operation according to actual climatic conditions due to excluding thefinal stage of refrigerant evaporation with extremely low intensity of heat transfer. It is quite effective forconventional heat exchangers as well as for microchannel ones.