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Thread: Geothermal Design
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13-05-2012, 08:20 PM #29
Re: Geothermal Design
Hi everyone, the house design has come along quite a bit and we have floor plan sorted , i used this web site
http://www.design-navigator.co.nz/
to enter all construction details and it gave me a heat transfer of 383W/K. This does not include air infiltration and ventilation so with an HRV i expect up to 750W depending on air in / air out temps.
So with a 20k inside to outside i have heat loss of 7660w + 750w = 8410w.
Average summer temperature is 21.8°C (Night minimum temperature averages 9.4°C below day maximum)
Average winter temperature is 13.0°C (Night minimum temperature averages 7.6°C below day maximum)
Palmerston North has an average 1,730 hours of sunshine per year (40% of possible hours)
The climate is temperate
Annual rainfall is 963mm
Average 121 Wet days (>1mm) per annum
Average 38 days per annum with ground frost (4 per year of -5°C or lower)
Annual average wind speed = 10.6kph (Windiest months are Nov-Jan, 12.5kph; and least windy Jun-Jul, 8.5kph
So it comes back to the question of source, geo or air?
And what to base this on?
thanks Andy