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Forum: Lawn and Garden

01-27-14, 07:54 PM

Replies: 6

Pvc pressure drops

Views: 8,311

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: Geothermal & Heat Pumps

03-04-13, 10:30 PM

Replies: 15

Arduino issues

Views: 13,980

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: Geothermal & Heat Pumps

02-13-12, 08:41 AM

Replies: 11

Running cost: ASHP vs. Nat Gas Furnace

Views: 17,704

Posted By mrd

Heat pump COP degrades as outdoor temps drop. ...

Heat pump COP degrades as outdoor temps drop. Just a result of the fixed outdoor heat exchanger surface area and limited min refrigerant temperature inside of it. Basic thermal physics I suppose.
...

Forum: Renovations & New Construction

02-10-12, 11:31 AM

Replies: 165

Garage / workshop project

Views: 98,252

Posted By mrd

I believe IRC code minimum is 5/8" penetration of...

I believe IRC code minimum is 5/8" penetration of wood studs. So 1-1/4" would be the bare minimum for 5/8" rock. And that's with screws 12" on center, max. But, is this for a garage ceiling below...

Forum: Solar Heating

12-07-10, 02:10 PM

Replies: 23

Solar heating: How to calculate energy

Views: 34,497

Posted By mrd

I am interested in seeing solar water(or other...

I am interested in seeing solar water(or other liquid) heating being made more versatile and applicable. Let's simplify the concepts and the systems to reduce the barriers to entry for parties...

Forum: Renovations & New Construction

11-26-10, 04:43 AM

Replies: 19

Polyisocyanurate or extruded polystyrene for in ground use?

Views: 22,803

Posted By mrd

EPS vs. XEPS...

EPS vs. XEPS (http://www.dyplastproducts.com/newsletter/more_xpseps.htm)

Extruded is referred to as XEPS or XPS.. Expanded is EPS. Colored stuff is XPS. This thread is going to confuse people :o

Forum: Renovations & New Construction

08-28-10, 06:56 AM

Replies: 165

Garage / workshop project

Views: 98,252

Posted By mrd

You could insulate the inside of the block wall. ...

You could insulate the inside of the block wall. Either a short insulated framed wall in front of it, or more rigid foam. I'd guess the block wall wicks water from the ground, in which case I'd...

Forum: Renovations & New Construction

08-17-10, 04:57 AM

Replies: 165

Garage / workshop project

Views: 98,252

Posted By mrd

Have you heard of solosider...

Have you heard of solosider (http://www.solosider.com/)? If I ever had to hang hardi alone that's what I'd try using. Might be worth looking at.

Also you mentioned having it well insulated to...

Forum: Renovations & New Construction

08-10-10, 01:14 PM

Replies: 165

Garage / workshop project

Views: 98,252

Posted By mrd

It'd be nice if there was an easy calculation to...

It'd be nice if there was an easy calculation to optimize windows on the south face, but there are many variables.

It is a trade-off between introducing additional heat load in the summer to be...

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