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Search: Posts Made By: JRMichler
Forum: Renovations & New Construction 12-05-14, 09:35 PM
Replies: 50
Views: 35,767
Posted By JRMichler
Cold winters, yes. Last winter was colder than...

Cold winters, yes. Last winter was colder than normal, about 9,900 heating degree days. A normal winter is about 9,000 HDD. Burned 627 therms of natural gas to heat a 1300 square foot house plus a...
Forum: Renovations & New Construction 12-05-14, 01:28 PM
Replies: 50
Views: 35,767
Posted By JRMichler
Foamular makes three different higher strength...

Foamular makes three different higher strength foams for use under footings. I used Foamular 400. They also make 600 and 1000 for even higher loads.

The builder had to buy a pallet load of...
Forum: Renovations & New Construction 12-02-14, 04:38 PM
Replies: 50
Views: 35,767
Posted By JRMichler
Not even close to Passive House standard. Air...

Not even close to Passive House standard. Air sealed to 0.85 ACH50, compared to Passive House standard of 0.5 ACH50. Walls are R32, ceiling R96, windows Anderson 400 series, 4" foam under...
Forum: Renovations & New Construction 12-01-14, 09:12 PM
Replies: 50
Views: 35,767
Posted By JRMichler
This is important in poorly insulated houses,...

This is important in poorly insulated houses, with old leaky windows. It is not necessary with modern well insulated low leakage houses with modern windows. My own house has all the hot air vents...
Forum: Renovations & New Construction 11-30-14, 03:29 PM
Replies: 50
Views: 35,767
Posted By JRMichler
Heat transfer between the water and the inside...

Heat transfer between the water and the inside tube wall is usually better than heat transfer through the tube wall and from the outside tube wall to the room. In that case, laminar vs turbulent...
Forum: Renovations & New Construction 10-15-12, 09:25 PM
Replies: 50
Views: 35,767
Posted By JRMichler
The sketches show a parallel system with supply...

The sketches show a parallel system with supply on one side and return from the opposite side. The flow path from supply through any one branch to return is exactly equal to the flow path through...
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