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 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…"
2 hours ago
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…"
6 hours ago
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
Tom Mallard replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"Excellent Kaushal, all I can do at them moment is advocate using the roof as the main collector & piped water the main thermal-mass, then the wall construction using insulation on the outside under the siding so the look of the home is not…"
Apr 30
Tom Mallard replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"Kaushal, this is a technical point, the reason from an energy standpoint they want little leakage is the assumption that the heating or cooling is coming from the grid or by burning fuel oil when passive homes don't need to be air tight to be…"
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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Latest Activity

Craig Bird commented on Hal Skinner's group The RCC Classroom (Radiant Control Coatings)
"And how much of that 1.7% of the suns energy that got through the RB or RCC gets into the house,…"
15 minutes ago
Hal Skinner commented on Hal Skinner's group The RCC Classroom (Radiant Control Coatings)
"OK.  This might be rudamentary here.  I want to make sure everyone understands how SOLAR…"
36 minutes ago
Craig Bird commented on Hal Skinner's group The RCC Classroom (Radiant Control Coatings)
"Hal - I would disagree that radiant heat "goes through" fibrous insulation. Radiant heat…"
46 minutes ago
Hal Skinner commented on Hal Skinner's group The RCC Classroom (Radiant Control Coatings)
"Hi KLurt. I would isagree with the comment that the attic floor is heated by the…"
1 hour ago
Craig Bird commented on Hal Skinner's group The RCC Classroom (Radiant Control Coatings)
"Now back to your question - the best data for radiant barriers is the DOE studies from the ORNL.…"
1 hour ago
Kevin Jordan posted a discussion

Does anyone have pointers on approaching real estate induatry.

Hello All!!I am figuring on approaching the real estate and low income housing industries here in…See More
1 hour ago
Craig Bird commented on Hal Skinner's group The RCC Classroom (Radiant Control Coatings)
"Kurt - Radiant heat transfer does not heat the air. It is the passing heat directly from hot object…"
1 hour ago
Steven Turetsky replied to John Shillito's discussion Fixing a water heater?
"Hello John (and everyone else in the forum), I'm a new visitor at this forum and it this is my…"
1 hour ago

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