Air-side performance of a parallel-flow parallel-fin (PF2) heat exchanger in sequential frosting

Experimental investigation of the performance of microchannel heat exchangers with a new type of fin under wet and frosting conditions

“…Xia et al [6] experimentally studied five louvered-fin microchannel heat exchangers, and found that condensate droplets significantly affect the air pressure drop and heat transfer in the refrost cycles. Zhang and Hrnjak [7] investigated the frosting performance of parallel-flow parallel-fin (PF2) flat tube microchannel heat exchangers with horizontally installed tubes. Compared with a conventional serpentine fin, frosting performance improved owing to the better drainage capability of the PF2 heat exchanger.…”

Experimental study on heat and mass transfer characteristics for a desiccant-coated fin-tube heat exchanger

“…tube wall systems in winter [18][19][20][21][22]. For example, a frost-free air-source heat pump water heating system with integrated solid desiccant was proposed [20]; comprising a conventional ASHP and an extra DCHE, in which the outside air traverses the DCHE before entering the heat pump evaporator.…”

A new method for preventing air-source heat pump water heaters from frosting

“…Some work have been carried out to delay frosting and improve defrosting efficiency, including heat exchanger surface treatments (Jhee et al, 2002) and optimizing the fin structure of heat exchangers (Zhang and Hrnjak, 2010). The characteristics on the wettability of a given surface can be described by either the interfacial energies/tensions or contact angles.…”