How does a fan coil unit work?
Answer:
Are we talking Fan coil unit as in Air Conditioning??, in simple terms your room side unit cools the air, the heat energy is then absorbed by the refrigerant which is usually R407C, this is then pumped as Gas in Copper lines to the externally mounted Condenser which then cools the Refrigerant by drawing Air across a coil and condenses the R407 C back to liquid which is then pumped back to the internal Fan coil unit to repeat the cycle.
I would point out, looking at your Avatar name, this is very different from a Plumbing installation and uses higher grade Copper pipe designed for higher pressures and should only be installed by a Refrigeration engineer, it is also illegal as the refrigerants are regulated because of there Greenhouse gas potential
It blows away the semen.
In the outside fan coil unit: -
In the compressor, compression increases the temperature of the refrigerant gas.
In the condenser, the forced air flow from the fan first cools then condenses the gas to a high pressure, liquid refrigerant..
This then goes to the expansion valve which decreases the pressure and increases the volume of the liquid, resulting in the partial re-vaporisation of liquid refrigerant.
This occurs due to 'Sensible Heat' being removed from the liquid refrigerant to provide Latent Heat of Vaporisation of a part of the liquid causing the 'Joules-Thomson' cooling effect of the refrigerant liquid.
The cold refrigerant is then piped to the inside evaporator unit.
(The cold refrigerant piping will be lagged to prevent outside heat ingress).
(Is part 3 to be 'How does the Inside Evaporator Unit Work?)
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