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
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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 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
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
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
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
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
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
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
Tom Mallard replied to Hal Skinner's discussion How much heat energy is lost through the floor of a house?
"Sorry for the incorrect wording, but what I'm after is a chart by frequency of the spectral response of a surface/coating. The tape example on target but the question is what the response to IR is in particular and it'd sure be nice to see…"
Nov 4
Tom Mallard replied to Hal Skinner's discussion How much heat energy is lost through the floor of a house?
"Hmmm, didn't know that Tom. To me most radiant barriers are just reflective not intentionally specific to wavelength, afaik the radiant barriers on insulation board or insulation aren't real good at reflecting long IR so using a coating…"
Nov 4
Tom Mallard replied to Hal Skinner's discussion How much heat energy is lost through the floor of a house?
"All that's missing is what frequencies don't emit the 10% lost, with those I can calculate what's going on."
Nov 1
Tom Mallard replied to Hal Skinner's discussion How much heat energy is lost through the floor of a house?
"It appears the important metric is what the coating can re-radiate of the thermal energy it's exposed to, that would explain the low temp's on one side of a barrier. So, my thesis right now is that most of the energy gets transferred at a…"
Nov 1
Tom Mallard replied to Hal Skinner's discussion How much heat energy is lost through the floor of a house?
"Re: "If the RCC is that effective applied to the bare metal under a mobile home with no R- insulation, can one expect an equally large reduction in heat loss when applied directly to the underside of a wooden floor on a house?  I think…"
Nov 1
Tom Mallard replied to Kurt Shafer's discussion Where can I find the best radiant barrier to install under my roof?
"Anything done to raise the roofing off the sheathing works to reduce the high temperatures in the attic above ambient but has limits.So, to deal with bad situations like my attic being 160F daily in Phoenix a lot of summer requires reducing…"
Oct 25
Tom Mallard replied to Tony Rigdon's discussion Placement of 5/8" firewall, over or under foam board insulation?
"There will be moisture buildup on the faces of the insulation board so it shouldn't be in contact with the drywall, I would seal the drywall before applying it to prevent it from soaking up moisture, then furr on top of the insulatioin to add…"
Sep 25
Tom Mallard commented on Hal Skinner's group The RCC Classroom (Radiant Control Coatings)
"To those with coatings as products, my reaction is that you need spectral analysis by wavelength to get directional transmission rates black-body style to be able to compare them. This info can then be put into radiative thermal modeling to compare…"
Sep 2
Tom Mallard replied to Hal Skinner's discussion How much heat energy is lost through the floor of a house?
"For self-heating homes I'm using an insulation board under the joists to be able to use that space as a duct space to move air to store heat/cold in water-filled pipes, it will reduce radiative losses by having two more layers of foil along…"
Sep 2

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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