Second Law of Thermodynamics states that if a cold object is placed near a hot object, the temperature of colder object will rises and the temperature of warmer object will fall.
so how it practically works..............
It works on principal of cooling through evaporation.
An evaporating gas called refrigerant draws heat from the surrounding and make it cold.
there is a compressor which imparts high pressure to the refrigerant (pure Ammonia is used commonly which evaporates at -32 Celsius). Due to this high pressure its temperature increases and it becomes hot. This heated gas flow through the coil, behind the refrigerator which allows excess heat to be released in surrounding (this is the reason of feeling warmer around the fridge).
eventually the ammonia cools down to the point where it becomes liquid. then it passes through an expansion valve.due to a very small opening the liquid ammonia is turned into a very cold, fast moving mist.Since this evaporation occur at -32 Celsius the ammonia draw heat from the surrounding.
This the second law of thermodynamics where the cold ammonia take heat from the object which is placed in refrigerator (say a water bottle) and makes the object cooler. As it takes heat it temperature rises and then this warm ammonia is returned back to compressor and the cycle continues where the pressurization, evaporation and cooling begins.
so how it practically works..............
It works on principal of cooling through evaporation.
An evaporating gas called refrigerant draws heat from the surrounding and make it cold.
there is a compressor which imparts high pressure to the refrigerant (pure Ammonia is used commonly which evaporates at -32 Celsius). Due to this high pressure its temperature increases and it becomes hot. This heated gas flow through the coil, behind the refrigerator which allows excess heat to be released in surrounding (this is the reason of feeling warmer around the fridge).
eventually the ammonia cools down to the point where it becomes liquid. then it passes through an expansion valve.due to a very small opening the liquid ammonia is turned into a very cold, fast moving mist.Since this evaporation occur at -32 Celsius the ammonia draw heat from the surrounding.
This the second law of thermodynamics where the cold ammonia take heat from the object which is placed in refrigerator (say a water bottle) and makes the object cooler. As it takes heat it temperature rises and then this warm ammonia is returned back to compressor and the cycle continues where the pressurization, evaporation and cooling begins.
