Fin spacing optimization of a fin-tube heat exchanger under frosting conditions

Numerical Modeling and Experimentation on Evaporator Coils for Refrigeration in Dry and Frosting Operational Conditions

“…The authors used a correlation for airside heat transfer, based on their own heat exchanger data which cannot be extrapolated to other coil conditions. (Yang et al, 2006a(Yang et al, , 2006b) optimized fin spacing of a frost fin-and-tube evaporator to increase coil performance and operational time between defrost cycles. In common to most of the theoretical and modeling work reported herein, validations generally relied on the data available in the open literature or on private collaborative exchanges.…”

A modeling study on alleviating uneven defrosting for a vertical three-circuit outdoor coil in an air source heat pump unit during reverse cycle defrosting

“…In order to better improve the defrosting performance for an ASHP unit, a number of previous experimental studies were carried out to exam various ways for better defrosting performances. These included optimizing the structure of an evaporator [12,29], fin space adjustment [30], fin surface treatment [31], heating up the liquid refrigerant in an accumulator [32], providing heat for defrosting using phase change materials [9,13], etc.…”

Frosting characteristics of fin-tube heat exchanger at temperature range of −18 to 6 °C of a cascade heat pump

“…Yao et al [2] used a frosting model to study the frosting quantity, and found the frosting quantity almost changes linearly with the time. But the study only considered the outdoor air temperature of 0 C and À4 C. Yang et al [3] studied the fin spacing under the outdoor temperature range of À8.8 C to À13.4 C, but only 100% relative humidity condition was considered. Diogo et al [4] conducted experimental study on four different types of fin-tube coils to understand the frost accumulation process under environment temperature between 2.5 C and 7 C. Gong et al [5] considered the climate characteristics in centralesouth China and conducted experimental and theoretical studies on the frost formation on fin-tube coil, in which the experiments were carried out at 0 C and -5 C. However, there are few literature considering extreme low temperature conditions except Guo et al [6,19], whose work studied the impact of environmental conditions on frosting process under the temperature range of À15e5 C and humidity range of 55%e90%.…”