期刊名称：Lecture Notes in Engineering and Computer Science
印刷版ISSN：2078-0958
电子版ISSN：2078-0966
出版年度：2018
卷号：2235&2236
页码：671-677
出版社：Newswood and International Association of Engineers
摘要：It is widely known that defrosting operation on
commercial refrigerators is one of the main causes of
inefficiency on these systems. Several defrosting methods are
used nowadays, but the most commonly used are still timecontrolled
defrosting, usually by either electric resistive heating
or reverse cycle, as most demand defrost methods are usually
complex, expensive or unreliable. Demand defrost can work by
either predicting frost formation by processing measured
conditions (fin surface temperature, air humidity and air
velocity) and/or frost accumulation symptoms such as pressure
drop and refrigerant properties. Other way of knowing when
to defrost is to directly measure the frost formation using
sensors such as photoelectric, capacitive or resistive. This
review gathers some of the methods that can be used for
directly measuring frost accumulation on the evaporator fin
surface.
