Hi Magoo,
House is OK, workshop is a bit of mess, "nothing changed, there then"
Many spirits broken.
thanks
Mad
Printable View
Hi Magoo,
House is OK, workshop is a bit of mess, "nothing changed, there then"
Many spirits broken.
thanks
Mad
Hi MF.
good to here you are all OK, what was it 4 shakes over 5.0 on the rechter scale, and the liquifaction would be soul destroying, I reacon the west has sunk half a meter by now. Emigrate north. But then again Auckland is made up of 30 + volcanic cones and blow vents, not a nice thought.
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
Howdy andy,
Now it think it comes down to cost. If the budget can include ground loops, go for it. What I would rather see (just because of personal interest) is a ASHP with a solar hot water to bump up the COP when able. I love the idea of telling the utility to stick it up their a...... when the sun is shining.
Oh BTW, look at the loop spacing fot the radiant. In an "normal" home here the typical installer wil have tubing at 300mm in a thick slab. I was really taken aback when BigFreeze and nd others would talk about 100mm but now I am a convert, well at least to 150mm anyway, sometimes closer. Check to see what the locals say about spacing.
The answer is quite simple.
Which system on average will have the highest suction pressure.
150mm centers for me. and high water flow rates
On those temps you have to go air. They barely merit heating the house (I'm sure Mike would agree) :D.
Get your ufh in at 100mm centers with loop lengths in the 80-90m range and 5K across your condensor and once your heat pump is set up well your COP should be off the chart.
Don't use HRV unless the house is air tight. Waste of money and a heat loss amplifier. Go Demand Control Ventilation instead
Geo source would still have a more stable temp , no need for defrost , no outdoor unit around the house. At start of heating season earth at 16c and end of winter 10c at 1m depth. With the demo geo i made i know that i can get really close approach temps , but with air i have not seen the same efficencies. so im still leaning to geo , and it will be somethig a bit different around these parts.
Big Freeze , how does demand control work , on internal humidity levels?
Hi Andy,
I am installing one of my Boost units is Foxton in the next few days, do you want to catch up and look at your numbers
cheers
Mad
Ya, you have one centralized extract fan that is ducted to all you wet rooms. The vents in the wet rooms have a humidity strip that opens the vent above a certain level and the fan reacts to that. There are also vents in your dry rooms that open on the same principle but they are not ducted back to the unit and just allow air in room outside.
Your soil temps are crazy high. Didn't think it was possible but there you go :). Geo is definitely back on the agenda then.
Hi MF.
at Foxton Fries, or similar name.
hi Mad , catch up would be great ! Im currentley at home recovering from kindergarten induced stomach bug but on the mend.
021976068. hopefully can arrange something , we live in Feilding.
cheers Andy