Tom Mallard
  • Bellevue, WA
  • United States
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Standard Wall Thermal Upgrade Analysis
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Started this discussion. Last reply by Bill Bradbury Dec 2, 2013.

Applied Passive-solar Structural Design
48 Replies

Passive-solar has been known to work well but certain things about our architecture fail the thermodynamic efficiency test and there are reasons why.First is heat-transfer through conduction, the…Continue

Tags: comfort-zone, heat-transfer, passive-solar

Started this discussion. Last reply by Bill Bradbury Apr 2, 2012.

 

Tom Mallard's Page

Latest Activity

Tom Mallard replied to Damien Greenfield's discussion Is there is cost saving for you in having a tankless water heater?
"Cost is not a metric in efficiency, efficiency is the metric. With alternatives you pay for capacity never by-the-watt or by-the-therm, therein lies a pack of lies because costs can be manipulated easily as seen by how reliable, honest, forthcoming,…"
Jan 4
Tom Mallard replied to Damien Greenfield's discussion Is there is cost saving for you in having a tankless water heater?
"That's unfortunate, fossil methane production is between crude oil and coal for carbon-footprint, the glut of new wells is why it's cheap but the long-term affect of that will be to keep heating the ocean, the air isn't as big a deal,…"
Jan 3
Tom Mallard replied to Damien Greenfield's discussion Is there is cost saving for you in having a tankless water heater?
"The grid mixes power, you can't tell where it came from unless you're doing the mix, it's a big money game so very complex with demand & supply with preference to fossil over wind and hydro, they don't mix it to cost the…"
Jan 3
Tom Mallard replied to Damien Greenfield's discussion Is there is cost saving for you in having a tankless water heater?
"Since solar hot-water units are cheap vs anything interior to a home and the water tank can be near the collector, I'd argue your using coal for at least 1/2 your power not sun and that's obviously ruining the planet when on the grid."
Jan 2
Tom Mallard replied to Damien Greenfield's discussion Is there is cost saving for you in having a tankless water heater?
"Thanks Theodore, perfect info."
Jan 2
Tom Mallard replied to Irvin McLaughlin's discussion Unhappy customer, feels should have saved more...
"Can't ask for much more than that, cheers Irvin!"
Jan 2
Tom Mallard replied to Irvin McLaughlin's discussion Unhappy customer, feels should have saved more...
"Have any of you ever run heat-transfer modeling of what you build, and how can you tell what's going on thermally if you don't? If not, the white is 20C, blue 0C, a simple conduction model run of 400-minutes the standard wall on top the…"
Jan 2
Tom Mallard replied to Damien Greenfield's discussion Is there is cost saving for you in having a tankless water heater?
"From my own & Earthship experience, add solar hot-water using a 150-gallon tank as average size to have enough mass to not cool down very fast, then on-demand rarely goes on."
Jan 2
Tom Mallard replied to Damien Greenfield's discussion Is there is cost saving for you in having a tankless water heater?
"It doesn't take much of a solar collector for hot-water to seriously reduce how often these come on per year, using a 150-gal tank as they stay warm longer & still not too big. Most collectors use water + anti-freeze to a heat-exchanger in…"
Dec 15, 2014
Tom Mallard replied to Hal Skinner's discussion How much heat energy is lost through the floor of a house?
"Thx, Robert. Being a PNWester where crawl spaces are moist or wet seasonally & some sites never dry out, dealing with that properly means dealing with pore pressure on the foundation at highest flow, that's the cause and typical is a…"
Nov 21, 2014
Tom Mallard replied to Hal Skinner's discussion How much heat energy is lost through the floor of a house?
"And if you can't afford that, add thermal collection and you may not need to worry about how leaky it is ... that's a principle, homes don't have thermal collection, that's"
Nov 20, 2014
Tom Mallard replied to Hal Skinner's discussion How much heat energy is lost through the floor of a house?
"I've found plenty of SW/LWIR coating companies in photonics most for lenses some for surfaces, and found that most spectrometers don't distinguish LWIR very well. To test radiance & conduction requires a good one for full spectral…"
Nov 7, 2014
Tom Mallard replied to Hal Skinner's discussion How much heat energy is lost through the floor of a house?
"The technique has changed radically and the crawl space now considered how to add thermal-mass to an existing home. The key is a layer of concrete blocks laid sideways and the holes are used as ducting so it can support the weight of the mass and is…"
Nov 6, 2014
Tom Mallard commented on Adam Swain's blog post Top Worst Crawl Space Insulation Ideas
"In the Northwest people use a vapor barrier on the dirt, thick black plastic the usual choice so you can crawl on it and not tear it; this may even be code here not sure on that but very common. This of course only deals with moisture and helps a…"
Nov 6, 2014
Tom Mallard replied to Hal Skinner's discussion How much heat energy is lost through the floor of a house?
"Yeah, I ended up on photonics.com pretty fast, but you're wrong about what I'm doing, the heat supply is close to the radiant barrier in the design, it's not at the floor, it's under the thermal-mass. The heat source is warm air…"
Nov 5, 2014
Tom Mallard replied to Hal Skinner's discussion How much heat energy is lost through the floor of a house?
"So you don't know of any charts with spectral responses for materials? ... maybe phys.org has links, sorry to bother you."
Nov 4, 2014

Profile Information

Company
Mallard Design Company
Professional Interests
Residential scale wastewater purification using biomass to extract excess nutrients, autonomous architecture leveraging thermal-mass + insulation in wall systems, solar-thermal collection & storage of thermal needs hot&cold.
Website URL
http://www.mallard-design.com
Twitter ID
@tmallard
LinkedIn Profile
http://www.linkedin.com/in/mallarddesigncompany

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Tom Mallard's Blog

Applied Passive-solar Structural Design

Passive-solar has been known to work well but certain things about our architecture fail the thermodynamic efficiency test and there are reasons why.

First is heat-transfer through conduction, the wood, drywall, sheathing all having rather high heat-transfer coefficients. Next is convection from a heat-riser which takes the warmth of the floor and moves it to the ceiling.

Until these are dealt with they cost a lot of energy, if one is trying to not require external heating for…

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Posted on December 21, 2011 at 1:00pm

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At 8:28pm on March 2, 2011, Diane Chojnowski said…

Hi Tom,

Welcome to Home Energy Pros! Great start...thanks for adding all the great photos and comments. If you're blogging about home performance, this is the place for you!

Thanks!
Diane, HEP Moderator

 
 
 

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