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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

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Heating and cooling: Niggling idea in my head

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    • CommentAuthoreniacs
    • CommentTimeJan 10th 2023 edited
     
    I've neen looking at getting a heat pump for our 4 bed house, thinking of a 9kw unit with a 300l tank. I realise looking at specs that the COP will be a very good 3+ above 2 degrees. Anything below will be below a COP of 3.

    Weve a 12'000L pool in the garden that is dormant in the winter. Its temperature slowly follows ambient, it will take weeks to get down to 5 deg and then weeks to go back to 10 deg too.

    Basically Im thinking to use a heat pump to cool the pool water and heat the house. The heat input to the pool would be able to be PLC choosen, ie if the air temp is above pool water temp then run a fan coil and pump to "warm" the pool water from ambient air.

    I know its a drastic solution to a simple problem of low COP but my mind keeps going back. Maybe its the engineering challenge.

    Has anyone seen a similar project?
    • CommentAuthorJeff B
    • CommentTimeJan 11th 2023
     
    Basically a water-to-water heat pump then? 12,000 litres sounds a lot but is not huge like a lake for example. I would have a look on the Internet and get some opinions from those who manufacture such kit, such as:

    https://www.vaillant.co.uk/homeowners/products/renewables-solutions/water-source-heat-pumps/?gclid=CjwKCAiA2fmdBhBpEiwA4CcHzbsATykJb3FDsyYXBV_taDtcbUA-mu-GyJ7GAeTLOf-vI3hxmO0wBxoC0EcQAvD_BwE

    P.S. I have no connection with Vaillant - it just happened to be the first reference I came across via Google.
    • CommentAuthorphiledge
    • CommentTimeJan 11th 2023
     
    I took it to be an "air source" heat pump with a very big low temp thermal store😁
    • CommentAuthoreniacs
    • CommentTimeJan 11th 2023
     
    Jeff, thats it exactly, i have seen a few used ground source heat pumps being ripped out and sold for £500 locally so thought i could probably get one of them and use it. Although i wouldnt get the high DHW temps of the modern heat pumps.

    I would have thought the pool wouldnt store much heat, even at 12k litres, its operating temp range will be low. Lets have a quick look how much it does store:

    Lets say the "Charged temp" is 10 degrees C (the highest likely ambient temp in the winter, somtimes higher but usually 5-10deg here)
    Then the lowest usable temp will be say -2 (you would never be able to take it below that as the fan coils to "heat" the pool would not have defrost available).

    Energy of the water is: 12 x 13.5kwh = 162kwh. This would probably be enough to heat my house for 2-3 days during a very cold snap.

    I suppose the problem with this is once the pool is very cold, no further heat could be extracted without freezing the fan coil heating. Probably a dead end here.

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