Heat requirement per square Meter or Feet?

[Herbert1]

Have been asked to quote a replacement boiler for main house 2 floors with good insulation, windows & doors running radiators(aprox 2600 square feet) and then the annexe at (1600 Square Feet) the annexe is underfloor heating over 2 floors with good all round insulation. existing boiler is aprox 97 KW.

are there any bullpark figures of heat requirments over 1 square meter or 1 square foot?

I dont want to spend too much time on this if the clients decide not to bother.

thanks in advance

 

[spraggo]

You simply convert square feet to square metres such as:

1 square foot = 0.09290304 square metres.

 

[Biggles..]

50W/m2.

 

[DeltaT2]

50W/m2.

Yeah, that's the 'bullpark' figure most of the Greenwash Heatpump used-car salesmen quote for an average Winters day. F.ck knows what they really need for our -14C Winters we are now experiencing??!!!.......

 

[Agile]

I was going to suggest 50w/m2 for a well insulated place and about 100w/m2 for a less well insulated one.

Tony

 

[Herbert1]

Thank you for the replies.

 

[Biggles..]

Between 3 - 6 btu's per cubic ft.

It takes roughly twice as much to cool than it does heat.

Minimum for a truly well insulated house is around 35W/m2

 

[Agile]

Surely you dont still think and work in BTUs ?

Even if you do I think you have got those BTU figures wrong!

Tony

 

[Biggles..]

Yep, certain things are still worked out in btu's just like certain green grocers still sell in pounds/ounce rather than kilo's.

Figure is correct as a rule of thumb.

 

[Biggles..]

Yep, certain things are still worked out in btu's just like certain green grocers still sell in pounds/ounce rather than kilo's.

Figure is correct as a rule of thumb.

 

[D_Hailsham]

Use the Boiler Size Calculator.

 

[spraggo]

Surely you dont still think and work in BTUs ?

Even if you do I think you have got those BTU figures wrong!

Tony

1 WATT = 3.415 Btu`s