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Search: Posts Made By: JRMichler
Forum: Geothermal & Heat Pumps 04-05-22, 08:25 PM
Replies: 11
Views: 1,291
Posted By JRMichler
This is correct. To put some numbers on that 100...

This is correct. To put some numbers on that 100 CFM, the Ingersoll Rand RS18i air compressor is rated 113 CFM at 110 PSIG. It has a 25 hp (18.65 kW) motor.

That's 18.65 kW of power to get 1.8...
Forum: Renovations & New Construction 03-10-22, 07:35 PM
Replies: 10
Views: 1,124
Posted By JRMichler
I'm not in the south either, but last summer we...

I'm not in the south either, but last summer we had several days in a row with temperatures over 90 deg F. The AC finally started on the fourth day because it took that long for the house to heat...
Forum: Energy Storage 03-10-22, 07:29 PM
Replies: 22
Views: 19,814
Posted By JRMichler
A simple check valve has a metal disk. The...

A simple check valve has a metal disk. The weight of that disk is probably enough to stop convection flow. I suggest just adding a check valve after the pump. I would not use a check valve with a...
Forum: Geothermal & Heat Pumps 03-10-22, 07:18 PM
Replies: 11
Views: 1,291
Posted By JRMichler
The electricity to an air compressor motor ends...

The electricity to an air compressor motor ends up as heat distributed as follows:

From the motor (about 5% to 10% of the electricity in).
From the compressor itself.
From the hot compressed...
Forum: Renovations & New Construction 09-06-21, 11:40 AM
Replies: 2
Views: 1,546
Posted By JRMichler
Did you seal all penetrations to the attic before...

Did you seal all penetrations to the attic before adding insulation? If not, sealing attic air leaks is more important than most people realize.

There is (almost) no such thing as too much...
Forum: Tools 06-24-21, 03:52 PM
Replies: 5
Views: 2,180
Posted By JRMichler
Onset Computer makes several temperature and...

Onset Computer makes several temperature and temperature/humidity dataloggers. I have used several of their products and have been very pleased. Their user interface is one of the best I have ever...
Forum: Conservation 01-28-21, 03:03 PM
Replies: 6
Views: 2,967
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: Renovations & New Construction 09-30-20, 11:55 AM
Replies: 6
Views: 3,278
Posted By JRMichler
What do you consider superinsulated? I'm a...

What do you consider superinsulated? I'm a little north of you in Wisconsin, so have similar heating needs. My house has 4" foam under the crawl space and footings and outside the foundation, R30...
Forum: Geothermal & Heat Pumps 12-30-19, 06:20 PM
Replies: 18
Views: 5,541
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: Appliances & Gadgets 12-20-19, 05:32 PM
Replies: 8
Views: 4,737
Posted By JRMichler
Try this outfit:...

Try this outfit: https://www.onsetcomp.com/products?f%5B0%5D=im_taxonomy_vocabulary_8%3A547&f%5B1%5D=im_taxonomy_vocabulary_14%3A54. They make quality products at a reasonable price.

A couple...
Forum: Conservation 01-23-19, 05:20 PM
Replies: 575
Views: 817,194
Posted By JRMichler
My experience is that about 35 CFM is normally...

My experience is that about 35 CFM is normally enough for a house with two or three people in it. The house is fairly tight at 0.85 ACH50. We run the HRV at a higher speed for a couple days when...
Forum: Renovations & New Construction 11-07-18, 06:36 PM
Replies: 7
Views: 5,925
Posted By JRMichler
On that job, I used 1" foam. The windows had...

On that job, I used 1" foam. The windows had been installed such that I could just butt the foam up to them.

If I was doing a similar job today, I would use 3" to 4" of foam. I would remove the...
Forum: Renovations & New Construction 09-29-18, 07:17 PM
Replies: 7
Views: 5,925
Posted By JRMichler
Foam on the outside is an excellent idea in an...

Foam on the outside is an excellent idea in an older house. A friend once put new siding on an older house. He took the advice of his neighbors who told him that foam was not necessary if he was...
Forum: Other Improvements 07-18-17, 02:12 PM
Replies: 8
Views: 3,953
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: Conservation 03-26-17, 01:02 PM
Replies: 0
Views: 2,138
Posted By JRMichler
Inadvertent HRV bypass

I built a new house five years ago, and had a single speed Fantech SH704 HRV installed. The HRV moved more air than needed, and made a lot of noise, so it was mostly left off. I sort of noticed...
Forum: Conservation 03-24-17, 04:22 PM
Replies: 575
Views: 817,194
Posted By JRMichler
Google rotating heat exchanger. Rotating heat...

Google rotating heat exchanger. Rotating heat exchangers have very high efficiency and no actuators or dampers.

I don't know if frost in cold temperatures (-35 deg C) would be a problem,...
Forum: Tools 01-20-17, 06:55 PM
Replies: 3
Views: 3,203
Posted By JRMichler
There's good information about thermocouples...

There's good information about thermocouples here: OMEGA Engineering : Technical Reference (http://www.omega.com/techref/Z-section.html). The Introduction To Practical Temperature Measurements seems...
Forum: Geothermal & Heat Pumps 11-15-16, 07:56 PM
Replies: 83
Views: 28,552
Posted By JRMichler
Have you calculated the heat loss at -25 C? You...

Have you calculated the heat loss at -25 C? You really need that information to properly size the heating system.
Forum: Renovations & New Construction 11-15-16, 07:52 PM
Replies: 161
Views: 80,536
Posted By JRMichler
Great project! I also have an insulated heated...

Great project! I also have an insulated heated shop. Be aware that, when temperatures and humidity rise in the spring, your shop will not. When that 80 degree 75 DP air hits your 50 degree shop,...
Forum: Renovations & New Construction 08-15-16, 08:17 PM
Replies: 30
Views: 10,288
Posted By JRMichler
My suggestion: If you are considering spending...

My suggestion: If you are considering spending $XXXX for geothermal / radiant / solar / whatever, do a heat loss calculation assuming you spent the same $XXXX for upgraded windows and insulation. ...
Forum: Appliances & Gadgets 08-11-16, 07:52 PM
Replies: 53
Views: 28,672
Posted By JRMichler
It's just a piece of sheet metal lined with foam....

It's just a piece of sheet metal lined with foam. Plywood would work just as well as the sheet metal.
Forum: Appliances & Gadgets 08-11-16, 07:30 PM
Replies: 53
Views: 28,672
Posted By JRMichler
The factory muffler kit definitely makes it...

The factory muffler kit definitely makes it quieter. We folded an old rug and put it under our unit and made it even quieter. It's a little louder than I would like, but is still tolerable in our...
Forum: Appliances & Gadgets 07-31-16, 08:15 PM
Replies: 53
Views: 28,672
Posted By JRMichler
The nameplate says R22. It's running right now. ...

The nameplate says R22. It's running right now. The room temperature is 76 deg F, 53% RH, outlet temperature is 100 deg F. The outlet temperature reading may be a little low, it's a cheap little...
Forum: Appliances & Gadgets 07-30-16, 01:56 PM
Replies: 53
Views: 28,672
Posted By JRMichler
Maybe I'm lucky or something, but we bought a...

Maybe I'm lucky or something, but we bought a Thermastor Santa Fe Classic dehumidifier in 2003. We put it in the living room to use as a whole house dehumidifier in summer. It's been working...
Forum: Solar Heating 06-08-16, 09:38 AM
Replies: 7
Views: 4,750
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...
Showing results 1 to 25 of 109

 
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