Hic wrote:
there is no "outside T °" nor "outside delta" !!!!!!
since we compress air inside
(cold air being rejected outside)
Little cap lesson, to stop delusional. Sorry.
It is not the air that is compressed in a heat pump, neither inside nor outside. It is a fluid (formerly the famous freon) which turns in circles, inside the circuits (coils), sometimes in the liquid state, sometimes in the gaseous state. We must not let it escape from elsewhere! (compulsory checks). Air cannot be a PAC fluid, it liquefies far too difficult. Liquid air is produced and distilled in factories at very high pressure and very very low temperatures (for the production of gas: hospital oxygen, etc.).
1) Let's start from the fluid in the gaseous state, you compress it (with an electric motor which actuates a compressor - the characteristic little noise of refrigerators - which consumes electricity), it liquefies in coils, releasing heat that heats the air around these coils. It is the condenser, which "heats" therefore. If there is no heat release, it does not liquefy!
2) This liquid, you send it to other coils, where it evaporates, it produces cold which it stings in the air which surrounds these coils. It is the evaporator, which therefore cools [with sometimes other effects: frost, etc.].
It does not evaporate if there is no warming.
3) You put the evaporator in a room, and the condenser outside: you have a cold room. Your system "stings" calories inside to reject them outside ... You "exchange" your electricity for cold.
Ditto for a fridge or freezer. In this case, the evaporator is inside the insulated trunk and the condenser the grille at the rear (chuade). (By the way: fridge and freezer are therefore also heaters for the rooms in which they are located! Even in summer !!)
4) You put the evaporator outside and the condenser inside and you have an air / air heat pump. It stings calories outside and heats up inside. You trade electricity for calories. The COP measures the ratio between the energy consumed by the electric motor and the "useful" calories - heating - released by the condenser. The COP decreases as the difference between the interior and exterior temp increases (temperatures not of the fluid, but temp of the source in which this fluid "stings" or "rejects" the caories)
4bis) You can even have a system that turns one way in winter and the other way in summer and you have a reversible air conditioning!
5) You put the evaporator and the condenser in a single room: one stings the calories that the other releases, the calories "go round in circles", it neither heats nor cools.
Except that the electricity consumed by the motor is released as heat. You have in fact a "pseudo-convector" whose calorific power is exactly equal to the power consumed by the motor. COP = 1.
If I understood correctly, that is what you are considering. So I can give you the COP: it's 1! Whether the machine is a little, not at all or very sophisticated!
5) Very easy experience, if you don't follow me: you empty your fridge, you open the door and you plug in. You will see that: a) it runs continuously (unless the engine overheats; a bimetallic strip then protects and cuts it); b) heats very very little ... and c) consumes a lot of electricity. COP = 1.
