Jerwin G RamirezBSABEN 4Engr. Shiela Marie F. Gatchalian
Assignment in Refrigeration Engineering
Components of Refrigeration CycleCondenserThe condenser is one
of the easiest components to spot on a refrigerator. It is a large
grid of coils often on the back or underneath the refrigerator
accompanied by a cooling fan that draws air over the coils to help
them dissipate heat, according to the Repair Clinic website. The
condenser's job is to act as a vessel for the refrigerant to travel
through, transforming the high-pressure gas into a liquid.
EvaporatorAfter the refrigerant passes through the condenser and
transforms into liquid it passes through a metering device and into
the condenser. The condenser provides more space for the
refrigerant, which allows it to return to a gaseous state. This
causes rapid cooling and causes moisture to freeze on the
evaporator. A fan circulates the resulting cold air throughout the
refrigerator. The evaporator on most refrigerators is located
inside the freezer compartment if it is a combination unit.
Otherwise, it is located inside the main refrigerator
compartment.
ThermostatThe refrigerator's thermostat is a simple device that
senses the internal temperature of the main compartment. Owners set
a dial on the thermostat to indicate the cooling level they desire.
This is usually somewhere between 32 and 38 degrees Fahrenheit in
the main compartment. The thermostat stops power to the compressor
when the temperature drops below the desired setting.
Defrost SystemThe frost build up on the evaporator would get
excessive if not for the automatic defrost system. Icing could
result and cause other problems. But the defrost system keeps frost
and ice from getting out of hand by regularly melting it. The
defrost system is made up of three main parts. A timer signals the
heating coil in regular intervals to begin heating, which melts off
the frost. Once the temperature rises above freezing, a temperature
sensor signals the heater to shut down, which allows the system to
cool normally again.
Ice MakerMost of today's refrigerators have a built-in ice
maker. This component means no more ice trays in the freezer. A
constant water supply fills cube molds and then the ice maker
ejects the frozen cubes and refills periodically.
CompressorThe compressor is the cooling engine of the
refrigerator. This device is located either at the bottom of the
refrigerator at the back of the unit or on top of the refrigerator.
The compressor compresses the refrigerant to make it a
high-pressure gas whenever the thermostat calls for cooling in the
system. It runs quietly and sends the refrigerant into the
condenser.
