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Wall Mounted Air Source Heat Pumps & Village Hall.

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We had an event at a local old village hall on Saturday.  Maximum capacity 100 people. The hall is heated only by four wall mounted heat pumps sited at just over head height. The hall was cool. The heat pumps were struggling.  The outside temperature was 6 degrees C. After turning on via a remote control unit, flaps slowly open on the internal units and warmish air comes out, which seems to flow upwards to the ceiling. With wall mounted radiators at least they are located lower down and can radiate some heat at leg height, or people can stand next to them if really chilled. I am not impressed with the heat pumps.

Z.

  • 0 in reply to AJJewsbury

    I assume that the hall heat loss was calculated before the heat pump installation. Many of these units only provide a couple of kW of heat unless it is warm outdoors, A heat pump with a 20C differential might have a COP as small as 3, so that might give 12 kW of heat. That is not a lot for a hall with a stage, which is presumably at least 1000 sq ft in size and high too, so maybe 20,000 cu ft. Even with good insulation, I would expect it to take a couple of hours to really feel warm. SW IR heaters are very good for this kind of place, but quite a lot are needed, probably about 30kW for my guess at the size of the hall. Still only a few pounds per hour though!

  • 0 in reply to David Stone

    The installation would have been approved by the "Hall Committee" ( a bunch of amateurs) with  local Council Approved. The units were installed by a "specialist" contractor based in Norwich I believe.

    The hall is chilly!

    But, new double glazing has been ordered. The existing seems o.k. apart from a few broken hinges and handles. These village halls get so much public funding with grants etc. It is frightening.

    Z.

  • 0

    The system may have been designed as background heat only. If more heating is required dependent on the outside temperature; topup heating in the form of radiant, "instant" heating would then be required. As an Electrical Engineer with a new town developer in Scotland -  Cumbernauld Development Corporation, we would apply this principle to such rooms. The installer of the equipment should be consulted in your case.

    To illustrate the criticism, Joe Public complained in the local press, that the builders had used unplaned wood planks for the concrete shuttering whereas the architects had specified shot blasted planks for the visual effect.    

    We were innovators of such electric heating - ICI ceiling heating, floor heating, fan heating etc. dependent on the heat loss, occupancy rate, expected metabolic emission etc. Other heating systems were ice prevention using heating grids for ice prevention on external, concrete stairways and road inclines; still in vogue?. 

    Jaymack  

          

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