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Search: Posts Made By: mrd
Forum: Renovations & New Construction 04-21-14, 05:33 PM
Replies: 257
Views: 52,725
Posted By mrd
I've never nailed/stapled flooring but I believe...

I've never nailed/stapled flooring but I believe you're supposed to fasten through the tongue and it's hard to tell but looks like you're stapling the groove in your pictures. If so, you may be able...
Forum: Renovations & New Construction 02-24-14, 08:32 PM
Replies: 10
Views: 2,956
Posted By mrd
Here's a few I have on my list of windows to...

Here's a few I have on my list of windows to investigate next time I'm purchasing: WeatherMaster windows, Interstate windows, Intus windows. Weathermaster website is advertising some mighty low...
Forum: Renovations & New Construction 02-15-14, 12:39 PM
Replies: 257
Views: 52,725
Posted By mrd
Maybe an aluminum paint, something like this:...

Maybe an aluminum paint, something like this: Attic Radiant Barrier Paint, Wall Vapor Retarder Coating (http://www.hytechsales.com/prod85.html)
Forum: For Sale / Trade / Wanted / Web Finds 02-02-14, 09:50 PM
Replies: 54
Views: 12,305
Posted By mrd
I also bought one of these after seeing this...

I also bought one of these after seeing this thread, and was surprised how quickly it shipped. I installed it onto the heatpump lines in the main panel, and went through the setup routine.

It...
Forum: Conservation 01-30-14, 11:16 AM
Replies: 23
Views: 4,340
Posted By mrd
Cheap solution: If you find a spot where you get...

Cheap solution: If you find a spot where you get alot of air infiltration, throw a damp towel over it. Might help humidify the air as it leaks in :)
Forum: Conservation 01-28-14, 08:48 AM
Replies: 6
Views: 2,122
Posted By mrd
With cold outdoor temperatures, a slight vacuum...

With cold outdoor temperatures, a slight vacuum in the house is better. Your warm indoor air holds more moisture per volume, so if pressurized you'd have greater potential for in-wall condensation....
Forum: Biofuels 01-28-14, 08:12 AM
Replies: 12
Views: 5,122
Posted By mrd
A few years back I saw a photo blog of a home...

A few years back I saw a photo blog of a home build where they installed what looked to be a huge polyethylene water tank, something like this...
Forum: Lawn and Garden 01-27-14, 07:54 PM
Replies: 6
Views: 1,580
Posted By mrd
http://docs.engineeringtoolbox.com/documents/1147/...

http://docs.engineeringtoolbox.com/documents/1147/plastic-pipe-pressure-loss-diagram.png

Looks like 1/2" @ 3GPM ~ 3.8psi/100'
3.8psi x 125'/100' = 5.7psi, so your 5.5psi value checks out.
...
Forum: Biofuels 01-26-14, 04:17 PM
Replies: 12
Views: 5,122
Posted By mrd
Hydro to Heat Converter - Panoramic...

Hydro to Heat Converter - Panoramic (http://www.hydro-to-heat-convertor.com/panoramic.html)

I'd buy this bad boy if I could afford it. This is the only hydronic fireplace I've found available in...
Forum: Geothermal & Heat Pumps 01-21-14, 10:51 PM
Replies: 37
Views: 19,530
Posted By mrd
Maybe you could build a radiant wall on the...

Maybe you could build a radiant wall on the exterior of the house. Something similar to those homemade hot water solar collectors (http://www.builditsolar.com/Experimental/PEXColDHW/Overview.htm). ...
Forum: Renovations & New Construction 12-04-13, 09:28 PM
Replies: 588
Views: 219,424
Posted By mrd
If the efficiency and cost of heat pumps and...

If the efficiency and cost of heat pumps and photovoltaic cells continue to improve, it may turn out different than expected.
Forum: Renovations & New Construction 04-21-13, 08:04 AM
Replies: 99
Views: 20,014
Posted By mrd
S-F, HSPF is a seasonal COP, it's supposed to be...

S-F, HSPF is a seasonal COP, it's supposed to be indicative of an average COP over the season, accounting for variable performance depending on outdoor air temperatures. Of course, every region has...
Forum: Renovations & New Construction 04-21-13, 07:57 AM
Replies: 99
Views: 20,014
Posted By mrd
There is a heat pump technology called 'enhanced...

There is a heat pump technology called 'enhanced vapour injection' which appears to alter the capacity (and perhaps efficiency) curve across various outdoor air temperatures.

See page 3 in this...
Forum: Renovations & New Construction 04-21-13, 07:25 AM
Replies: 99
Views: 20,014
Posted By mrd
mackerel, that is a cool spreadsheet. I see...

mackerel, that is a cool spreadsheet. I see there is an ASHP HSPF adjustment table at the bottom. The adjusted HSPF value has quite an effect on the cost of ASHP operation relative to other forms...
Forum: Geothermal & Heat Pumps 03-04-13, 10:30 PM
Replies: 15
Views: 3,313
Posted By mrd
What it 'posts' is the value passed to the...

What it 'posts' is the value passed to the function Serial.println. That function name indicates you are utilizing the serial port to print a line.

The value you are passing in your new code is...
Forum: Renovations & New Construction 03-04-13, 11:41 AM
Replies: 99
Views: 20,014
Posted By mrd
Did you notice if it was defrosting often that...

Did you notice if it was defrosting often that month? I have a Fujitsu system, 8.6HSPF, heating my home with a Manual-J load of about 20k @ 15F. I keep the tstats at 70F day & night.

I don't any...
Forum: Geothermal & Heat Pumps 07-07-12, 07:56 AM
Replies: 24
Views: 10,092
Posted By mrd
It should be noted, the described system and...

It should be noted, the described system and calculations are based on a heat exchanger that is separate from the conditioned space. The drawing on that site is in plan view. Each tube in the heat...
Forum: Geothermal & Heat Pumps 03-23-12, 04:16 PM
Replies: 1,940
Views: 1,408,634
Posted By mrd
It's not really a paradox; There are various...

It's not really a paradox; There are various ways to improve efficiency of a system, each with an up-front differential cost and a recurring savings. A cost-conscious consumer will determine how...
Forum: Geothermal & Heat Pumps 03-20-12, 01:29 PM
Replies: 55
Views: 17,632
Posted By mrd
What is it, precisely, that causes COP to drop? ...

What is it, precisely, that causes COP to drop? I suppose the vast majority of input power is driving the compressor, and to increase Td you need either a faster compressor rate (for a variable...
Forum: Geothermal & Heat Pumps 03-13-12, 10:09 AM
Replies: 40
Views: 24,915
Posted By mrd
That's funny, the TED logo is almost identical to...

That's funny, the TED logo is almost identical to that of TED: Ideas worth spreading (http://www.ted.com)
Forum: Geothermal & Heat Pumps 03-13-12, 08:00 AM
Replies: 40
Views: 24,915
Posted By mrd
Well, it appears I neglected finishing...

Well, it appears I neglected finishing documentation of my installation in this thread.

I did finish the installation, and the rest of the home, and we finally moved in at the beginning of the...
Forum: Geothermal & Heat Pumps 03-05-12, 09:43 PM
Replies: 55
Views: 17,632
Posted By mrd
Nice! Is this system operating under the VSD...

Nice! Is this system operating under the VSD mentioned earlier? I see the EEV is being operated to maintain optimum efficiency. Did you do any tests to arrive at your set superheat value? How are...
Forum: Geothermal & Heat Pumps 02-15-12, 10:25 AM
Replies: 282
Views: 99,700
Posted By mrd
The SI manual indicates virtually everything is...

The SI manual indicates virtually everything is controlled by thermistors. See the EEV control section. Also, it appears the compressor frequency is controlled to meet a indoor hx target...
Forum: Geothermal & Heat Pumps 02-15-12, 10:16 AM
Replies: 282
Views: 99,700
Posted By mrd
The Fujitsu service instruction manual provides...

The Fujitsu service instruction manual provides alot of details into the control logic of its systems. See:...
Forum: Geothermal & Heat Pumps 02-13-12, 09:38 PM
Replies: 55
Views: 17,632
Posted By mrd
Can you give any more details on the interface...

Can you give any more details on the interface and control of the EEV? Awesome work!
Showing results 1 to 25 of 106

 
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