SAMBIT SWARUP SATPATHY
VIVEK KUMAR UPADHYAYA
ANIL KUMAR SAMAL
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The amateur work of us tries to bring a joint unit of air and water
cooler under one roof which can effectively reduce the cost of
manufacturing and can increase the efficiency considerably . “ Waste Chill Recovery Heat Exchanger” as the name proclaims itself the chill which would have otherwise been wasted is recovered and used up in cooling the air using a radiator . So this unit provides us with both cold water and air simultaneously as per the requirement of user .
“Faster, mightier & smaller” is still the keyword for every invention and development. In day-to-day world we concentrate on the compactness and efficiency of every product. Keeping this in our thought we have designed and fabricated an economical and reliable unit known as “Water Cum Room Cooler”.
“Human comfort is that condition of mind, which expresses itself with the thermal environment”. In our project two rival properties of cool water and cool air are obtained. This system can be used continuously.
By using our system there is no need of going for a separate air conditioner or air cooler and water cooler. As both purposes are served by a single system, the cost is also lowered to a considerable level.
The human body works best at certain temperatures like other machines, but it cannot tolerate with range of variations. The human body maintains its thermal equilibrium by three modes of heat transfer i.e. evaporation, radiation and convection.
A human body feels comfortable when the heat produced by metabolism of human body is equal to the sum of heat dissipated to the surroundings.
The normal temperature of the human body is 37 degree centigrade or 98.6 degree Fahrenheit. But, if this level goes below 36.5 degree centigrade or 98 degree Fahrenheit and exceeds 40.5 degree centigrade or 105 degree Fahrenheit, the conditions become dangerous for human existence.
FACTORS AFFECTING HUMAN COMFORT
The important factors while designing any system of comfort are
Heat production & regulation in human body
Heat and moisture losses from body
Moisture content of air
Quality and quantity of air
Physiological hazards resulting from heat and extreme cold are
VAPOUR COMPRESSION REFRIGERATION CYCLE
The low pressure vapour in dry state is drawn from the evaporator during the suction stroke of the compressor. During compression stroke the pressure and temperature increases until the vapour temperature is greater than the temperature of condenser cooling medium
VAPOUR COMPRESSION CYCLE
When the high pressure refrigerant vapour enters the condenser heat flows from condense to cooling medium thus allowing vaporized refrigerant to return to liquid state.
After condenser the liquid refrigerant is stored in the liquid receives until needed. From the receiver it passes through an expansion value where the pressure is reduced sufficiently to allow the vaporization of liquid at a low temperature of about – 10 degree centigrade.
The low pressure refrigerant vapour after expansion in the expansion valve enters the evaporator on refrigerated space where a considerable amount of heat is absorbed by it and refrigeration is furnished.