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Post by crowsfoot on Jun 12, 2017 19:23:03 GMT
I thought you may like a look at the ground source heat pump that the unvented cylinder is connected too. The ground loop is on the left; inside the metal box is the pump for the ground loop. The heat pump (fridge) is on the right at the fore of the picture. Just think that ground loop will probably be well over 100m deep! Attachment Deleted |
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Post by rocketmanbkk on Jun 13, 2017 6:48:03 GMT
I've heard of these, never seen one. I've not read up on them but why would you have one & how do they work?
Are they good? Bad?
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Post by tomplum on Jun 13, 2017 9:24:25 GMT
nice one tappy, these are the future,
they take heat from the ground or the air and use it to heat our homes rockey, the ground is always warmer than the surface, thats why we bury pipes, so they wont freeze, so these units take that heat and supplement it with traditional methods, electric/gas/solid fuel to heat the house, its needs a large area of ground therefore installation is expensive but worthwhile long term,
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Post by crowsfoot on Jun 13, 2017 19:40:56 GMT
This is very much my own version of understanding how a heat pump works. On planet Mars you cannot have a liquid exposed to the Martian atmosphere. It's not because Mars is so cold it instantly freezes either! It's because the low atmospheric pressure on Mars that causes it to instantly vaporise (A little help from Andy Weirs book "The Martian" here). Back on Earth now  . The heat pump consists mainly of a compressor which creates a vacuum on the negative side (hence planet Mars on Earth inside the heat pump). Just like on planet Mars the liquid soon starts to vaporise (boil) and because (and here is the trick) "a gas contains more energy than a liquid" - so heat starts to escape from the liquid in the form of a vapour, when it reaches the compressor the gas is moved into the positive side of the compressor and is put under pressure where it starts to turn back into a liquid and in doing so gives up it's heat (this is the heat what's used to heat the building). The liquid is now very cold and goes through another chamber were it is depressurised and enters the vacuum side of the compressor again where it is warmed up by the ground loop and the process begins again. My own version of the refrigeration cycle and it's probably full of holes... but thinking this way I can at least get my own head around it (if only a little bit)! |
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Post by crowsfoot on Jun 13, 2017 19:55:49 GMT
I've heard of these, never seen one. I've not read up on them but why would you have one & how do they work? Are they good? Bad? A compressor is much cheaper to run than an heating element Rocky so that is the big reason why you would have one. saving £££££££££££££££  Because there is no burn of greenhouse gases to create heat they are also deemed to be eco friendly. Initially I thought rubbish, no good and so did a lot of others, but people are now telling me of annual electric bills of around £650/year this is inclusive of heating and hot water with them. Very expensive though to install. |
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Post by dickpuller on Jun 13, 2017 21:39:49 GMT
This is very much my own version of understanding how a heat pump works. On planet Mars you cannot have a liquid exposed to the Martian atmosphere. It's not because Mars is so cold it instantly freezes either! It's because the low atmospheric pressure on Mars that causes it to instantly vaporise (A little help from Andy Weirs book "The Martian" here). Back on Earth now . The heat pump consists mainly of a compressor which creates a vacuum on the negative side (hence planet Mars on Earth inside the heat pump). Just like on planet Mars the liquid soon starts to vaporise (boil) and because (and here is the trick) "a gas contains more energy than a liquid" - so heat starts to escape from the liquid in the form of a vapour, when it reaches the compressor the gas is moved into the positive side of the compressor and is put under pressure where it starts to turn back into a liquid and in doing so gives up it's heat (this is the heat what's used to heat the building). The liquid is now very cold and goes through another chamber were it is depressurised and enters the vacuum side of the compressor again where it is warmed up by the ground loop and the process begins again. My own version of the refrigeration cycle and it's probably full of holes... but thinking this way I can at least get my own head around it (if only a little bit)! You're not far off CF. Gasses boil at differing temperatures, so if you pressurise these gasses they create heat. You can create heat by just air, the friction on your bike pump will create heat - as you pump up your tyre. The ground will provide a constant temperature of around 5*C all year round, the earth is heated by the Sun & it retains that heat. That constant ground water temperature heats the fridge gas/liquid via a plate heat exchanger & turns this into a vapour/gas by evaperation. The fridge Gas is then pressurised(by the compressor) to increase it's temperature even further, that heat is then extracted from the fridge gas & as the gas cools it turns back into a liquid(condensing) - the cycle starts again. So any electricity used for only the compressor & pumps. Not directly used to heat anything. Some heat pumps use electrical elements to supplement the heat produced by the heat pump. For example; propane & CO2 amongst many others are used as a fridge gas. |
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Post by crowsfoot on Jun 14, 2017 6:13:48 GMT
I wonder how the fuck did anyone ever think this little lot up! I was never happy with the common term that gets flung at us in that that the heat pump "upgrades" the heat from the ground loop. I'm thinking how? Is it a con? Is there an heating element in there? After only 15mins of the heat pump being switched on that ground loop starts to feels very cold to the human touch. Reading "The Martian" was a turning point for me in terms of getting to grips with it all. Many parts of space are close to -273C between that the freezing point of water 0C there is +273C degrees of heat to be had. The heat pump is creating conditions inside like the coldness/vacuum of space in order to find this heat. Like I said this is "my own simple way" of explaining to myself how heat pumps create heat (seeming to humans) from nothing. |
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