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Search: Posts Made By: JRMichler
Forum: Conservation 01-28-21, 03:03 PM
Replies: 6
Views: 795
Posted By JRMichler
I'm up in Northern Wisconsin, and have some...

I'm up in Northern Wisconsin, and have some experience with this.

My shop is heated to 65 degrees, has the ceiling insulated to R80 with the soffit vents plugged. That roof never has ice dams,...
Forum: Geothermal & Heat Pumps 12-30-19, 06:20 PM
Replies: 18
Views: 3,389
Posted By JRMichler
Your guesses for sizes of heat pumps are about...

Your guesses for sizes of heat pumps are about right for a poorly insulated house with reasonable (less than 10%) window area.

A well insulated house would have at least R60 ceiling, R30 walls,...
Forum: Other Improvements 07-18-17, 02:12 PM
Replies: 8
Views: 2,670
Posted By JRMichler
I built an economizer into my new (at the time)...

I built an economizer into my new (at the time) house 15 years ago. A forced air system with a damper in the return air duct, a duct from the outside with a damper, and a switch (normal /...
Forum: Solar Heating 06-08-16, 09:38 AM
Replies: 7
Views: 3,621
Posted By JRMichler
CarbonKevin raises a valid point, so I pulled out...

CarbonKevin raises a valid point, so I pulled out an ASHRAE #1 pschrometric chart and did a pair of example calculations.

1) 40 deg F in, 60 deg F out, 0 RH, 100 CFM in. From the chart, 12.6 ft^3...
Forum: Solar Heating 06-07-16, 08:29 PM
Replies: 7
Views: 3,621
Posted By JRMichler
I use 0.018 BTU/ft^3/deg F, the same as bmxeroh. ...

I use 0.018 BTU/ft^3/deg F, the same as bmxeroh. It's almost certainly more accurate than typical temperature and airflow measurements. A one degree error on inlet and outlet temperatures could...
Forum: Conservation 03-01-16, 07:22 PM
Replies: 14
Views: 6,197
Posted By JRMichler
Frost on the inside of a roof is due to warm...

Frost on the inside of a roof is due to warm moist air leaking from the conditioned space. Fix those air leaks (there is always more than one) and you will save much more than by preheating furnace...
Forum: Lighting 11-04-15, 08:02 PM
Replies: 13
Views: 5,711
Posted By JRMichler
High pressure sodium lights are very efficient. ...

High pressure sodium lights are very efficient. The larger ones are more efficient than the best LED lights, so do not expect to get an energy savings by simply replacing HPS with LED.

The...
Forum: Tools 10-28-15, 08:04 PM
Replies: 11
Views: 5,693
Posted By JRMichler
In the early 90's, I owned a house in Houghton,...

In the early 90's, I owned a house in Houghton, MI. The land of 300" snow every winter. The house was a double wide with a low pitch roof (3"?) over a poorly insulated cathedral ceiling. Our first...
Forum: Renovations & New Construction 10-27-15, 08:03 PM
Replies: 16
Views: 5,072
Posted By JRMichler
I have some experience at sealing up and...

I have some experience at sealing up and insulating a garage. That tar fuzzboard stuff cannot be sealed. It's more like a hard air filter than anything else.

My own garage walls never did get...
Forum: Renovations & New Construction 10-18-15, 02:50 PM
Replies: 3
Views: 2,315
Posted By JRMichler
I built a heated garage/workshop in 1985. The...

I built a heated garage/workshop in 1985. The heat was from two rows of heat lamps in the ceiling. Ten heat lamps at 250 watts each for 2.5 KW. That was enough to maintain 60 degrees in all but...
Forum: Conservation 02-22-15, 03:43 PM
Replies: 11
Views: 4,842
Posted By JRMichler
I did something similar to the 16 foot door on my...

I did something similar to the 16 foot door on my shop when I converted if from a garage. I used foil face polyisocyanurate insulation because it does not support combustion, and a shop is chock...
Forum: Renovations & New Construction 12-05-14, 08:35 PM
Replies: 50
Views: 21,012
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, 12:28 PM
Replies: 50
Views: 21,012
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, 03:38 PM
Replies: 50
Views: 21,012
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, 08:12 PM
Replies: 50
Views: 21,012
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, 02:29 PM
Replies: 50
Views: 21,012
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 11-30-14, 02:04 PM
Replies: 13
Views: 4,432
Posted By JRMichler
I just ran across this thread. I built a house...

I just ran across this thread. I built a house in 2002 in Ashland, WI. I estimated the heat loss without any allowance for heat loss through the crawlspace floor. The crawlspace walls have 4" of...
Forum: Renovations & New Construction 06-02-13, 08:45 PM
Replies: 31
Views: 9,482
Posted By JRMichler
Covering the crawlspace floor with plastic will...

Covering the crawlspace floor with plastic will reduce the amount of moisture coming up into the house. The installation does not need to be perfect, anything is better than bare dirt.

If I was...
Forum: Lighting 10-04-12, 08:15 PM
Replies: 29
Views: 8,711
Posted By JRMichler
Photos you want, photos you get. I took some...

Photos you want, photos you get. I took some photos after dark with the light on. This fixture has a switch. The switch is sealed underneath a rubber membrane.

Photo taken with a flash to...
Forum: Renovations & New Construction 08-09-12, 08:33 PM
Replies: 20
Views: 8,098
Posted By JRMichler
The last time I had a roofing party, I started...

The last time I had a roofing party, I started doing favors for people 3 months ahead of time "Need help? I'm looking for people to show up for a roofing party"

We had a dozen people on the roof...
Forum: Conservation 04-26-12, 08:33 PM
Replies: 59
Views: 23,237
Posted By JRMichler
Our house was built in 2002 as an energy...

Our house was built in 2002 as an energy efficient house. The builder recently bought a blower door and tested it on our house. It came to 1.0 ACH50. That correlates roughly to 0.05 ACHnat (actual...
Showing results 1 to 21 of 21

 
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