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XONE
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« on: July 02, 2009, 08:09:49 PM » |
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I know this may well end up being the stupidest idea, ever, but has anyone put/thought of putting an ASHP in their loft? If you have a loft. Means it won't ever have to feel freezing temperatures and there shouldn't be an issue with damp freezing up the compressor. The only main draw back I can see, or more to the point hear, is that you'll have it humming away overhead, and yes, you'd have to fetch out some of your ceiling as well. As for the noise I was standing next to a 14kw Ecodan today on full chat and it was quite as you like and if you've got your loft properly insulated then surely it shouldn't be any more noise than your average boiler that you can hear churning away. I haven't taken into consideration fire issues though but apart form the electrics there shouldn't be an issue with this? I maybe wrong.
Good/bad or just plain idiocy?
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Brandon
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« Reply #1 on: July 02, 2009, 08:25:30 PM » |
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any possible heat advantage that may be gained from your loft will be gone in minutes.
I bet the ecodan you were next to was on a concrete pad, your loft is more like a guitar body.
The cooling effect to your loft will be noticeable.
To give sufficient free air to the machine, you will most likely have to significantly increase the ventilation in your loft.
The cooler loft will adversely affect the heat loss of the rooms below (considering that insulation is measured in watts per square meter / kelvin.
Cooling the air in the loft will allow the air vapour to condense, so not entirely sure about your no freezing...
Just thinking out loud
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changing the world, one roof at a time ..."We can't be B&Q astroturfers. That's one conspiracy theory too far. You should cut down on the pot." - Wookey |
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XONE
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« Reply #2 on: July 02, 2009, 08:34:52 PM » |
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I bet the ecodan you were next to was on a concrete pad, your loft is more like a guitar body.
Just thinking out loud
Yes the ecodan was on concrete slabs. I used to do a lot of stuff with music and nightclubs and very, very large soundsystems, we used to isolate everything with paving slabs so there was no vibration/feedback. Maybe prepare the loft before hand, plonk the ASHP on some paving slabs on top of acoustic insulation, maybe before hand acoustically insulate the whole loft floor space, not that hard or expensive, and put down plastic sheeting ( or eco equivalent ) in case of condensation? Like you, just thinking out loud and out of the box. Thing is we have no outside space to put one and this is also a good way round the planning permission issue as well. |
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StBarnabas
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« Reply #3 on: July 02, 2009, 08:43:15 PM » |
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I have one in my loft. 2:00-4:00pm and 1:30-6:30am economy 7. Solar water backup. Works OK for me..
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 Gestis Censere. 40x47mm DHW with TDC3. 3kW ASHP, 9kW GSHP, 3kW Navitron PV with Platinum 3100S GTI, 6.5kW WBS, 5 chickens. FMY 2009. |
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dhaslam
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« Reply #4 on: July 02, 2009, 09:38:01 PM » |
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Air doesn't hold very much heat so it needs a big quantity of air go give any useful heat. One watt will heat about three cubic metres by one degree in an hour. One alternative is to use an underground feed to the heat pump in very cold weather and to circulate warmer air through the pipe when available. However to draw air through a large unheated building would help.
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XONE
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« Reply #5 on: July 03, 2009, 08:41:21 AM » |
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I have one in my loft. 2:00-4:00pm and 1:30-6:30am economy 7. Solar water backup. Works OK for me..
How big is the unit? Did you manage to squeeze it through your loft hatch? Is it loud when the unit fires up and ticking over? Whats it's performance like through winter? |
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StBarnabas
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« Reply #6 on: July 03, 2009, 01:21:00 PM » |
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The heat pump is a Trianco-ActivAir 3kW job. I have no loft hatch as such but there is a triangular doorway into the loft area. My estimate is the unit produce c 3.5kW in summer but drops to a bit over 2kW on the coldest days- the loft never actually freezes but can go down to 4-5 degrees centigrade. Noisewise it is ceartainly audible but no louder when starting up. It pulls about 800W of electricity but there is the capital cost as well to consider the units are c £750 each..
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Gestis Censere. 40x47mm DHW with TDC3. 3kW ASHP, 9kW GSHP, 3kW Navitron PV with Platinum 3100S GTI, 6.5kW WBS, 5 chickens. FMY 2009. |
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XONE
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« Reply #7 on: July 03, 2009, 01:48:22 PM » |
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capital cost as well to consider the units are c £750 each..
Thats not bad, I was given a "unit" price on an ecodan 8.5 kw @ £3848 ! |
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dhaslam
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« Reply #8 on: July 03, 2009, 01:59:40 PM » |
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I got much the same quote for the smaller Ecodan, £3220 + £250 commissioning plus VAT. The only problem is that I bought a low price heat pump that only lasted one day and don't want to repeat that exercise.
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dhaslam
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« Reply #10 on: July 03, 2009, 03:12:31 PM » |
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I notice one thing about the spec. They are rated at 20C input so at normal winter temperatures the output is about two thirds the rated output. Still the 5kw version might do. Does it produce water hot enough for DHW without further heating?
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StBarnabas
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« Reply #11 on: July 03, 2009, 03:32:45 PM » |
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Hi DH
yes I have it set to produce DHW at 60 degrees seems fine though the efficiency goes down near the end of the cycle. Takes las long to go from 55 to 60 as from 20 to 30 degrees
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Gestis Censere. 40x47mm DHW with TDC3. 3kW ASHP, 9kW GSHP, 3kW Navitron PV with Platinum 3100S GTI, 6.5kW WBS, 5 chickens. FMY 2009. |
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dhaslam
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« Reply #12 on: July 03, 2009, 04:16:26 PM » |
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Thanks. I can manage with water between 50 and 55C so it should be OK.
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StBarnabas
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« Reply #13 on: July 03, 2009, 04:27:43 PM » |
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Good luck
you are welcome to look at mine but "its a long way to Tipperary" in the words of the song...
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Gestis Censere. 40x47mm DHW with TDC3. 3kW ASHP, 9kW GSHP, 3kW Navitron PV with Platinum 3100S GTI, 6.5kW WBS, 5 chickens. FMY 2009. |
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XONE
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« Reply #14 on: July 03, 2009, 06:04:36 PM » |
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I got much the same quote for the smaller Ecodan, £3220 + £250 commissioning plus VAT. The only problem is that I bought a low price heat pump that only lasted one day and don't want to repeat that exercise.
Warranty?? |
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