air to air heating

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air to air heating

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Pilsbury

Joined: 13 Dec 2004
Posts: 5645
Location: East london/Essex

Posted: Sat Jan 19, 13 2:47 pm Post subject: air to air heating

Just had my visit from a company that phoned me up offering me a chance to save 80% on my gas bill using renewable air to air heating system I qualify for a grant on.
Turns out its an air source heat pump system and there is nothing renewables about it.
It will apparently save me80% on my heating and work as a air conditioning unit and air purifying unit.
The sales guy who turned up was surprised I had a clue what it was all about and pretty much knew he wasn't going to sell one so he actually gave me very little info but the quote for a unit on the outside of the house and 2 heating units inside supplied and fitted was ï¿½8100.....
We think it would save us at best ï¿½400 a year so not a,chance but it bugged me they are selling it as a renewable, the sales man actually admitted its not and doesn't know,why the cold caller are song that term.

Hairyloon

Joined: 20 Nov 2008
Posts: 15439
Location: Today I are mostly being in Yorkshire.

Posted: Sat Jan 19, 13 3:00 pm Post subject:
Maybe it is made of old fridges? That's sort of renewable.

john of wessex

Joined: 18 Jun 2007
Posts: 2130

Posted: Sat Jan 19, 13 3:04 pm Post subject:
wont work in Winter................

Hairyloon

Joined: 20 Nov 2008
Posts: 15439
Location: Today I are mostly being in Yorkshire.

Posted: Sat Jan 19, 13 4:12 pm Post subject:

john of wessex wrote:

wont work in Winter................

I think you are wrong. A friend of mine has it in their lobbin, and she is the type that won't put up with the cold.

vegplot

Joined: 19 Apr 2007
Posts: 21301
Location: Bethesda, Gwynedd

Posted: Sat Jan 19, 13 5:43 pm Post subject:

john of wessex wrote:

wont work in Winter................

They will up to a point but efficiency isn't good.

Hairyloon

Joined: 20 Nov 2008
Posts: 15439
Location: Today I are mostly being in Yorkshire.

Posted: Sat Jan 19, 13 6:33 pm Post subject:

vegplot wrote:

john of wessex wrote:

wont work in Winter................

They will up to a point but efficiency isn't good.

Are you sure?
Rate of heat transfer is dependant on the temperature differential between the air and the machine.
Provided the machine can maintain a low enough temperature then there will still be heat transfer.
Cold air is denser, so it might even be more efficient.

Treacodactyl
Downsizer Moderator

Joined: 28 Oct 2004
Posts: 25795
Location: Jumping on the bandwagon of opportunism

Posted: Sat Jan 19, 13 6:45 pm Post subject:
Doesn't the system extract heat from the air going out of the building to heat the air coming in?

vegplot

Joined: 19 Apr 2007
Posts: 21301
Location: Bethesda, Gwynedd

Posted: Sat Jan 19, 13 7:04 pm Post subject:

Treacodactyl wrote:

Doesn't the system extract heat from the air going out of the building to heat the air coming in?

If used in conjunction with a heat recovery system then efficiencies will be very much better.

vegplot

Joined: 19 Apr 2007
Posts: 21301
Location: Bethesda, Gwynedd

Posted: Sat Jan 19, 13 7:07 pm Post subject:

Hairyloon wrote:

vegplot wrote:

john of wessex wrote:

wont work in Winter................

They will up to a point but efficiency isn't good.

Quote:

Most air source heat pumps lose their efficiency as the external temperatures fall below 5 degrees Celsius (about 41 degrees Fahrenheit). In colder climates, the system needs to be installed with an auxiliary source of heat to supplement the heat pump in the event of extremely cold temperatures or when it is simply too cold for the heat pump to work at all.

boisdevie1

Joined: 11 Aug 2006
Posts: 3897
Location: Lancaster

Posted: Thu Jan 24, 13 7:48 pm Post subject:
My mate installs heat pumps and they CAN be efficient if they are correctly installed and it's a good make of pump. But a lot of installers aren't that good so beware.

Shan

Joined: 13 Jan 2009
Posts: 9075
Location: South Wales

Posted: Fri Jan 25, 13 10:38 am Post subject:

vegplot wrote:

john of wessex wrote:

wont work in Winter................

They will up to a point but efficiency isn't good.

I have one in my office and bearing in mind the temperature today, it works quite well.

vegplot

Joined: 19 Apr 2007
Posts: 21301
Location: Bethesda, Gwynedd

Posted: Fri Jan 25, 13 12:24 pm Post subject:

Shan wrote:

vegplot wrote:

john of wessex wrote:

wont work in Winter................

They will up to a point but efficiency isn't good.

I have one in my office and bearing in mind the temperature today, it works quite well.

They work well enough but nowhere near as efficiently as GSHP.

Shan

Joined: 13 Jan 2009
Posts: 9075
Location: South Wales

Posted: Sat Jan 26, 13 9:02 am Post subject:
True they are not as efficient but they are also not as expensive or disruptive.

Pilsbury

Joined: 13 Dec 2004
Posts: 5645
Location: East london/Essex

Posted: Sat Jan 26, 13 9:09 am Post subject:

Shan wrote:

True they are not as efficient but they are also not as expensive or disruptive.

Well as I said they quoted me ï¿½8100 to fit to my terrace house, one external unit and one heater in the ground floor and on on the landing, leave the doors open if you want warm rooms was the advice.......

Shan

Joined: 13 Jan 2009
Posts: 9075
Location: South Wales

Posted: Wed Feb 06, 13 10:40 am Post subject:
I was lucky. I managed to get 2 units at cost price and my husband is qualified to fit them, so he did.

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