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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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Heating and cooling: A2A heat pump post heater?

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      CommentAuthordjh
    • CommentTimeAug 19th 2015
     
    I'm considering installing an electric post heater in my MVHR system, with an output of somewhere between 1 kW and 1.5 kW. It just occurred to me reading another thread (http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13604&page=1#Item_17) that an A2A heat pump should be able to reduce the power input required.

    So the big question is does such a beast exist? i.e. a heat pump configured with the condenser inside a duct and a suitable control system.
    • CommentAuthortony
    • CommentTimeAug 19th 2015
     
    They make them as part of the MHRV units know as exhaust air heat pumps.

    Air to air heat pump might need stand alone as your ductwork might not be able to deliver sufficient heat without huge amounts of fan noise, unless you are super insulated only have a very small heat loss.
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      CommentAuthordjh
    • CommentTimeAug 19th 2015
     
    Posted By: tonyThey make them as part of the MHRV units know as exhaust air heat pumps.

    Do you have a link to any examples, please? I know of ones that use the exhaust air to heat water (known as compact units in PH circles) but not ones that heat the incoming air.

    you are super insulated only have a very small heat loss

    Yes, PH level.
  4.  
    I don't like exhaust air heat pumps as they are using the heat from within the house as the source rather than outdoor air.

    What you really need is a small capacity ducted air to air heat pump but as has been discussed on here previously the air flow rates of a ducted heat pump are substantially higher than those required for MVHR.
  5.  
    Posted By: djhDo you have a link to any examples, please? I know of ones that use the exhaust air to heat water (known as compact units in PH circles) but not ones that heat the incoming air.


    Genvex make them.
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      CommentAuthordjh
    • CommentTimeAug 19th 2015
     
    Posted By: PeterStarckGenvex make them.

    Thanks. Which models? I already have MVHR, so I'm not looking for an integrated unit, just a heat pump with ducted condenser.
  7.  
    djh, sorry I got the wrong end of the stick. I've only heard of the GE MINI/MIDI range which are integrated MHRV and ASHP.
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      CommentAuthordjh
    • CommentTimeAug 19th 2015
     
    No problem.
  9.  
    For what it's worth, over here people integrate heatpumps with HRVs all the time - the "return" ductwork of the main heatpump is used as a supply for the HRV and the extract of the HRV is ducted (with smaller ducts) separately. It's not the optimal solution, but it works well, particularly in the heating season.

    Paul in Montreal.
    • CommentAuthorgravelld
    • CommentTimeAug 20th 2015
     
    Posted By: Chris P BaconI don't like exhaust air heat pumps as they are using the heat from within the house as the source rather than outdoor air.
    What is the name of the type of HP that is positioned at the external outlet of the MVHR then?

    Seems ridiculous to try to move the energy from the air that is supposed to be being heated!

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