Tom Mallard
  • Bellevue, WA
  • United States
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Standard Wall Thermal Upgrade Analysis
1 Reply

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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 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…"
7 hours ago
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
Tom Mallard replied to Hal Skinner's discussion How our ceramic based RCC works in the group Radiant Control Coatings
"So it seems that what you're saying is for heat-transfer the stuff has little resistance or R-factor in conduction but "reflects" by wavelength perhaps so makes overall transfer much less than what the tests for R-factor expose. My…"
Aug 26
Tom Mallard commented on jose caramelo's blog post Casa Automatica - Aiming for Zero consumption in acclimatization
"Right José, my post was more for someone with an existing home with siding to see what a change it can have thermally to move the siding off of the sheathing. Your system is far better by having no conduction paths, the thermal models show…"
Aug 18
Tom Mallard commented on jose caramelo's blog post Casa Automatica - Aiming for Zero consumption in acclimatization
"Nice work. Related to the double wall is a simple upgrade that can be made by using furring under the siding on a building to reduce conduction, the standard wall heats the thermometer to 4.1C, with furring 1.1C for a run of 400-minutes, this is…"
Aug 18
Tom Mallard replied to Hal Skinner's discussion Rooftop A/C units and exposed ductwork in the group Radiant Control Coatings
"Right, that reinforces my understanding of how it works, I was after what to plug in for values in this small thermal modeling app MIT did, this is a 400-minute run with the standard wall on top vs adding exterior insulation board on the bottom, has…"
Aug 1
Tom Mallard replied to Hal Skinner's discussion Rooftop A/C units and exposed ductwork in the group Radiant Control Coatings
"Sounds like the perfect, thin insulator adding enough thermal inertia to separate two masses and/or mediums a lot better than most insulation. For my use I'd spray it on the downward or exterior side of the board, it helps delay changes a lot…"
Aug 1
Tom Mallard replied to Hal Skinner's discussion Rooftop A/C units and exposed ductwork in the group Radiant Control Coatings
"I'm interested in these coatings, have seen something in trade mags and know it's $$$ off the bill to apply them. My experience was Phoenix, AZ, where the attic was 160F every day for months. The other part of moving cold with air is…"
Aug 1
Tom Mallard joined Hal Skinner's group
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Radiant Control Coatings

A group where energy professionals can learn about all the different energy saving aspects of RCCs.  I have worked with one particular RCC for 30 years.  I have amassed alot of information I can share.  Everyone knows, accepts and understands how RCCs work as a 'Cool Roof' coating.  However, that seems to be where the knowledge on these products different energy saving applications abruptly stops.  I hope to change that with this group. There are over 300 protective coatings out there and they…See More
Jul 31
Tom Mallard replied to Luis Hernandez's discussion Solar Heat Air
"Under the average floor for a home with a crawl space is air you don't want inside the home as well as most attic air.This method puts in pipes for thermal-mass and provides good aeration in the joist space then seals it from the crawl space…"
Jul 12
Tom Mallard replied to Luis Hernandez's discussion Solar Heat Air
"I was being specific, using the roof is for where nothin"
Jul 12
Tom Mallard replied to Luis Hernandez's discussion Solar Heat Air
"Consider using sections of roof for the main thermal collection where it's not practical to add a greenhouse or other collection system, use a data logger in the attic close to the peak between rafters to know daily temperature curves to know…"
Jul 10
Tom Mallard replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"Right, in all cases you have to reduce the wall heat-transfer rate to upgrade almost any thermal remodel and that's my point, by insulating the OUTSIDE you cut the conduction out of the equation as a direct path of heat-transfer from what is…"
Apr 30
Tom Mallard replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
""Leaky" is a relative term to thermal transfer rates and air is one of the least effective mediums, fluids and solids transfer heat far more efficiently than air. So if you keep air transfer, leakage constant and upgrade to…"
Apr 30

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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Hal Skinner added a discussion to the group The RCC Classroom (Radiant Control Coatings)
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Tom Mallard replied to Kurt Shafer's discussion Where can I find the best radiant barrier to install under my roof?
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