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Search: Posts Made By: JRMichler
Forum: Conservation 01-23-19, 05:20 PM
Replies: 561
Views: 530,558
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: 5
Views: 1,071
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: 5
Views: 1,071
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: 1,364
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: 766
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: 561
Views: 530,558
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: 1,167
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: 10,634
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: 160
Views: 23,311
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: 3,975
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: 49
Views: 6,489
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: 49
Views: 6,489
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: 49
Views: 6,489
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: 49
Views: 6,489
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: 2,541
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: 2,541
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: Solar Power 03-01-16, 07:43 PM
Replies: 26
Views: 3,945
Posted By JRMichler
Just screaming for some guerrilla solar....

Just screaming for some guerrilla solar....
Forum: Conservation 03-01-16, 07:22 PM
Replies: 14
Views: 3,741
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: Conservation 02-04-16, 06:58 PM
Replies: 13
Views: 2,877
Posted By JRMichler
If you still want enthalpy control, check out the...

If you still want enthalpy control, check out the Honeywell C7400 enthalpy control.
Forum: Conservation 01-11-16, 07:36 PM
Replies: 13
Views: 2,877
Posted By JRMichler
Concrete block, in addition to near zero...

Concrete block, in addition to near zero insulation value, is extremely porous. Wind, and the moisture in the air, goes right through it. Controlling humidity in such a building is an exercise in...
Forum: Other Improvements 11-21-15, 07:54 PM
Replies: 5
Views: 1,339
Posted By JRMichler
How far down is the water? If the pump is...

How far down is the water? If the pump is lifting the water 150 feet, that's over 60 PSI at the pump just to get the water to the surface. In that case, the energy savings would be small.

If the...
Forum: Appliances & Gadgets 11-21-15, 07:36 PM
Replies: 19
Views: 3,266
Posted By JRMichler
I have an Ecostat. It looks and acts like a...

I have an Ecostat. It looks and acts like a Honeywell T87, but does not use mercury. The HVAC installer had originally installed a different manual thermostat. I had it removed because it cycled...
Forum: Conservation 11-21-15, 07:16 PM
Replies: 3
Views: 1,186
Posted By JRMichler
A 72 inch ceiling fan is HUGE. In order to get...

A 72 inch ceiling fan is HUGE. In order to get anything close to the rated flow, it will need to be mounted 3 or 4 feet below the ceiling. A normal 8 foot ceiling should have a fan no larger than...
Forum: Solar Power 11-08-15, 08:30 PM
Replies: 3
Views: 889
Posted By JRMichler
[Wet blanket mode on] When I googled "strontium...

[Wet blanket mode on] When I googled "strontium cost", the number $1.00 per gram comes up. That's only $454 per pound. [Wet blanket mode off]

Large scale solar energy storage is necessary if we...
Forum: Solar Power 11-08-15, 08:19 PM
Replies: 15
Views: 2,410
Posted By JRMichler
And up north where I live, I would seriously...

And up north where I live, I would seriously consider installing solar PV panels vertical:

Snow won't cover the panels in winter.
Reflection off snow in winter will help.
No worries about hail...
Showing results 1 to 25 of 99

 
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