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 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
Tom Mallard replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"Thanks for the reply George, having followed around inspectors as part of the pickup crew for years, if you've made a good job of it in all phases, you pass inspection."
Apr 30
Tom Mallard replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"I'll post plans when they get finalized then results after it's built Kaushal. Since it's a hangout with 180-degree windows on a mountain ridge at 2,200ft near the Olympic Mts. in Washington, it'll be a good test."
Apr 27
Tom Mallard replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"Apology, this is rather much restating my earlier replies but is my reaction to the projects listed after that, since I'm looking for a cheap home to remodel to live in, most of the projects quoted are almost more expensive than the homes…"
Apr 27
Tom Mallard replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"After seeing the cost estimates by Glenn, my addition of insulation board under the siding on a 2k-sf home 32'x64' if you did the work yourself is about $1,500 and triples the wall thermal resistance, you can up the sealing by calking the…"
Apr 21
Tom Mallard replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"I've been working on simple thermal upgrades and for collecting heat the roof is a best place short of using a greenhouse wall. How to do this is simple, on the best solar gain roof areas install 1x1 spacers up against the roof…"
Apr 21
Tom Mallard replied to Patrick Michaelyan's discussion Rigid Foam (Polyiso) as a Weather-Resistive Barrier
"From a lot of these runs, I'd suggest you can leave the batting alone, my take is to not touch the interior at all for this, remove any vapor barrier from the exterior sheathing, box out for windows and all then add on the insulation &…"
Mar 6
Tom Mallard replied to Patrick Michaelyan's discussion Rigid Foam (Polyiso) as a Weather-Resistive Barrier
"By using insulation on the outside of the structure, you reduce conduction losses. These thermal modeling runs were 400-minutes with a 20C temperature differential, by adding 1-1/2" insulation board on the outside of the sheathing and using…"
Mar 6
Tom Mallard replied to Tom Delconte's discussion Energy Savings that Are Hot Air!
"Glad I could entertain you Tom, and good luck to you!"
Jan 27
Tom Mallard replied to Tom Delconte's discussion Energy Savings that Are Hot Air!
"Tom, some of my building experiences were to design and build passive-solar beginning in the 80's so have no clue what you're talking about, when you do that you learn what thermal-mass can be from a pile of rocks to an aquarium in the…"
Jan 27

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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