| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 444.92 KB | Adobe PDF |
Advisor(s)
Abstract(s)
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 time-controlled
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.
Description
Keywords
Controlling strategy Defrost Demand defrosting Frost detection Frost measurement Refrigeration
Citation
Publisher
Springer Nature Singapore Pte Ltd