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Home made heat pump

 
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adam2
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Joined: 02 Jul 2007
Posts: 6209
Location: North Somerset

PostPosted: Tue Dec 18, 2012 12:20 pm    Post subject: Home made heat pump Reply with quote

A refrigeration engineer whom I know has been experimenting with heat pumps, at very little expense as they have access to redundant equipment.

They have installed two heat pumps, one is air source and the other is ground source.
The ground souce heat pump collects heat from the soil in the front garden and pumps this into a large hot water tank at about 40 degrees.
This is used to heat coventional central heating radiators, but very over sized in order to emit enough heat at the low temperature.

The other unit collects heat from extracted air at about 20/25 degrees and heats the same hot water tank as the first unit.

Initial results are most encouraging with electricity consumption being about 10 to 20 KWH a day in cold weather.

I have my doubts about the general use of heat pumps on account of the costs and complexities involved and the likelyhood of expensive repairs.
In this case however the system is home made and most worthwhile if no value is put on the time spent tinkering.
They also have the advantage of a 3 phase electricity supply.

The next project is a higher temperature heat pump to reclaim the heat in waste water and use this to heat domestic hot water to a useful temperature.
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RenewableCandy



Joined: 12 Sep 2007
Posts: 12469
Location: York

PostPosted: Tue Dec 18, 2012 6:18 pm    Post subject: Reply with quote

Is the 40 degC water in a sealed system? Otherwise they might be at risk of Legionella and the like? Just a thought. Classic "salvage engineering", mind Smile
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adam2
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Posts: 6209
Location: North Somerset

PostPosted: Tue Dec 18, 2012 10:11 pm    Post subject: Reply with quote

Yes the water at 40 degrees is in a semi sealed system, with a feed and expansion tank. The water is treated with biocide.
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