16
Performance Analysis Of Domestic Refrigerator By Using 662 S- Silicone Grease Coating On The Evaporator
Authors: P.Mallikarjuna,Dr. B.Uma Maheswar Gowd
Number of views: 556
In present days, Refrigerators are cyclic devices working fluid in refrigerator is called Refrigerant. The performance of refrigerators
is expressed in terms of coefficient of Performance. And the cooling capacity of a refrigerating system is expressed in terms of Tonne of
Refrigeration. Frosting is an unavoidable phenomenon either in domestic refrigerator or in industrial installations. Different methods are
available to remove the frost accumulation like water defrost, electric defrost and hot gas defrost methods. Very few techniques are available
to reduce the frost accumulation in the evaporator. The main objective of the present work is to reduce the quantity of frost by using coating
on the evaporator coil. The coating chosen is to be very smooth, sustain the low temperatures and non wettable . so that there is a chance of
forming of frost layers in the evaporator. By doing so, water drips can roll off easily, the dust and other impurities deposited on the surface can
be easily removed. Commercially available 662 S - SILICONE GREASE coating material is chosen as coating material. A domestic
refrigerator of 165litres capacity working with refrigerant 134a was procured and its pull down characteristics was determined to analyse
proper working condition of the refrigerator without coating on the evaporator walls the load was kept inside the refrigerator and the amount
of frost deposited was measured for various time intervals. The above process was repeated for various loads. Then the evaporator was coated
with 662 S-SILICONE GREASE. The amount of frost deposited on evaporator was measured with the same loads used for without coating for
various time intervals. By comparing the experimental results the amount of frost deposited was found to be reduced when 662 S-SILICONE
GREASE coating was used. Due to reduction of frost accumulation the power consumption also was found to be reduced.
Keywords: Refrigerator, evaporator, R134A, frost accumulation, 662 S-SILICONE GREASE coating, COP, power consumption