Ground heat pumps. How does this heat exchanging work, then?
Discussion
From what I understand they work in reverse of the fridge principle but require a large area to heat exchange.
I know refrigerant is heated by a compressor. this heats it by compresion and sends it to the condenser as a gas. (A condenser usually uses air or seawater to cool it to a liquid) this changes it to a liquid by cooling it then it goes to a liquid reciever, where its held for going through a TCV (Thermostatic regulating valve) and through the fridge room via an evaperatoer (Heat exchanger) this then goes back to the compresser, and around again..
I dont understand the opposite bit though....may be magic.
I know refrigerant is heated by a compressor. this heats it by compresion and sends it to the condenser as a gas. (A condenser usually uses air or seawater to cool it to a liquid) this changes it to a liquid by cooling it then it goes to a liquid reciever, where its held for going through a TCV (Thermostatic regulating valve) and through the fridge room via an evaperatoer (Heat exchanger) this then goes back to the compresser, and around again..
I dont understand the opposite bit though....may be magic.
Thermodynamics mate - expanding gas / evaporation is endothermic (cooling)
Therefore, in a fridge, there is a closed system of refrigerant, that is compressed mechanically via a capiliary tube, then allowed to epand into the cooled area in the fridge. The bit at the back of the fridge (compressor area) gets hot, and the area inside the fridge wall (expansion chamber) gets cool. I beleive your steam powered fridge simply uses the steam to run the compressor, rather than an electric motor. The rest of the principle is the same.
Therefore, in a fridge, there is a closed system of refrigerant, that is compressed mechanically via a capiliary tube, then allowed to epand into the cooled area in the fridge. The bit at the back of the fridge (compressor area) gets hot, and the area inside the fridge wall (expansion chamber) gets cool. I beleive your steam powered fridge simply uses the steam to run the compressor, rather than an electric motor. The rest of the principle is the same.
I think the temperature of the ground at a metre or so depth is pretty much constant so even if the air above is freezing the ground is still say 10 degrees or whatever it is.
Therefore the liquid pumped through the buried pipes is warmed to at least that temperature. Therefore the boiler doesn't have to heat it as much. Therefore using less gas?
Might be completely wrong but thats what I've always assumed.
Therefore the liquid pumped through the buried pipes is warmed to at least that temperature. Therefore the boiler doesn't have to heat it as much. Therefore using less gas?
Might be completely wrong but thats what I've always assumed.
B17NNS said:
I think the temperature of the ground at a metre or so depth is pretty much constant so even if the air above is freezing the ground is still say 10 degrees or whatever it is.
Therefore the liquid pumped through the buried pipes is warmed to at least that temperature. Therefore the boiler doesn't have to heat it as much. Therefore using less gas?
Might be completely wrong but thats what I've always assumed.
Ive heard it is deep in the ground, Maybe this is it?Therefore the liquid pumped through the buried pipes is warmed to at least that temperature. Therefore the boiler doesn't have to heat it as much. Therefore using less gas?
Might be completely wrong but thats what I've always assumed.
From what I gather, water is pumped down a closed loop of pipe and given sufficient 'coils' in the pipe, the water is kept at whatever temperature the depth of the bore hole you drill is.
This water is passed through one side of a heat exchanger (metal fins, large surface area) with your central heating loop hooked up to the other. Although you will obviously never get hot temperatures with this soley, it will provide sufficient ambient heating, and also cooling.
This water is passed through one side of a heat exchanger (metal fins, large surface area) with your central heating loop hooked up to the other. Although you will obviously never get hot temperatures with this soley, it will provide sufficient ambient heating, and also cooling.
cheshire_cat said:
From what I gather, water is pumped down a closed loop of pipe and given sufficient 'coils' in the pipe, the water is kept at whatever temperature the depth of the bore hole you drill is.
This water is passed through one side of a heat exchanger (metal fins, large surface area) with your central heating loop hooked up to the other. Although you will obviously never get hot temperatures with this soley, it will provide sufficient ambient heating, and also cooling.
That's geothermal heating, and they use that in iceland (near the Findus crispy pancakes)This water is passed through one side of a heat exchanger (metal fins, large surface area) with your central heating loop hooked up to the other. Although you will obviously never get hot temperatures with this soley, it will provide sufficient ambient heating, and also cooling.
True geothermal uses hot groundwater, and this goes straight into a house and is decently warm.
The ground pump takes lots of cool liquid, and pumps it into the marginally warmer ground, and uses that 1-2' of heating of larger amounts of liquids to warm a small amount by more.
A fridge takes the heat out of the inside, and dumps it out the back, this works in reverse, so it's like putting a fridge in a doorway so the outside get cooler, and inside the house gets warmer.
nottyash said:
BigBen said:
BB-Q said:
Brilliant- but how does a fridge work? 
What I can never understand is my oven is hot but my fridge is cold yet both are powered by electricity.4 main components Compresser, Condenser, TCV, and evaperator.
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