Experimental study on frost release on fin-and-tube heat exchangers by use of a novel anti-frosting paint

Frosting Phenomenon and Frost-Free Technology of Outdoor Air Heat Exchanger for an Air-Source Heat Pump System in China: An Analysis and Review

“…In all the above mentioned clean and renewable energy resources, an air-source heat pump (ASHP) system is a kind of renewable energy device transferring heat energy from a low-temperature heat source to a high-temperature heat source called a heat sink, using a small amount Frost formation will occur inevitably on the surface of the outdoor air heat exchanger for the ASHP system operating in a cold and humid environment, when the surface temperature is below both the dew point and the freezing point [6][7][8]. During the early initial period of frost formation, the frost crystals depositing on the heat transfer surfaces play the roles of increasing surface area and surface roughness [9,10]. This may enhance the heat transfer between the surface and the outdoor air [11,12].…”

Effects of surface characteristics on liquid behaviors on fin surfaces during frosting and defrosting processes

“…Okoroafor and Newborough [7] tested the anti-frosting ability of a hydrophilic surface in over two hours, and results indicated that the reduction in the frost growth rate and frost thickness lied in the range, 10-30%. Huang et al [8] developed a fin-tube heat exchanger with hydrophilic coating and conducted comparative experiments to test its effectiveness in restraining frosting. Experimental results demonstrated that the anti-frosting time of the coated heat exchanger was longer compared with the uncoated one.…”

Analysis of the temperature, humidity, and total efficiency of the air handling unit with a periodic counterflow heat exchanger

“…While the first method of protection against the occurrence of frost is highly controversial (the deactivation of the ventilation) the second solutions for anti-freeze systems contribute to very high energy consumption, due to the need to heat the ventilation air to comfortable temperature. In such systems, the recovery efficiency of sensible, latent and total heat combined with possible recovery of moisture from the air without increasing the demand for energy is essential [19]. It should also be noticed that apart from the temperature, relative humidity is another main parameters affecting the level of human comfort.…”