03-09-2014, 03:09 PM
WATER COOLER CUM HEATER
WATER COOLER.doc (Size: 304.5 KB / Downloads: 13)
INTRODUCTION
Refrigeration is the process of removing heat from a substance under controlled conditions. Refrigerator is a reversed heat engine or a heat pump which pumps heat from a cold body and delivers it to a hot body. The substance, which works in a heat pump to extract heat from a cold body and to deliver it to a hot body, is called refrigerant.
Refrigeration is an accomplished by various methods such as the vapour compression system, absorption system, and steam jet refrigeration cycle. The vapour compression system of refrigeration is widely used. In the work also the vapour compression system is used.
COMPRESSOR
A compressor is considered to be the heart of the vapour compression refrigeration system it pumps the refrigerant through the system and circulates it again and again in cycles. It produces high pressure and hence high temperature to enable the refrigerants to reject its heat in the condenser. It also helps to produce low pressure in the evaporator to make the refrigerant to pick up maximum amount of heat from the space to be refrigerated.
ADVANTAGES
The coefficient of performance is quite high as the working cycle of this system is near the Carnot cycle
Among of refrigerant circulated is less per ton of refrigeration than air refrigeration system because the heat carried away by the refrigerant is the latent heat. As a result of this, the size of evaporator is smaller for the same refrigerating effect.
DISADVANTAGES
Prevention of leakage of refrigerant in this system is the major problem.
First investment cost is high than the air refrigeration system.
ADVANTAGES
Simple in construction
This system is noiseless in operation
CONCLUSION
In this changing modern world every day there is a new discovery in all fields of science and technology, benefiting the mankind. In this work the design of water cooler is slightly modified with an addition of hot water tank.