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 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…"
2 hours ago
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…"
5 hours ago
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…"
12 hours ago
Tom Mallard joined Hal Skinner's group
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Radiant Control Coatings

A group where people who work with radiant barrier coatings can let others know all of their uses.See More
yesterday
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

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

Comment Wall (1 comment)

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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

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…"
2 hours ago
Hal Skinner replied to Hal Skinner's discussion Rooftop A/C units and exposed ductwork in the group Radiant Control Coatings
"Products like these dont have an R-rating. You still have to have the R-rated insulation to meet…"
2 hours ago
Graham Irwin replied to Tom Conlon's discussion Whole House Fans - Love 'Em or Not?
"Thanks for the input. The next question to ask is "how much cooling power is delivered in each…"
3 hours ago
Brandon Walton commented on Brandon Walton's blog post 12 Things Every Home Performance Contractor Should Have on Their Work Truck
"Totally off topic William, but yeah could use a bit more I suppose "
3 hours ago
William H Nickerson commented on Brandon Walton's blog post 12 Things Every Home Performance Contractor Should Have on Their Work Truck
"One more thing...you need a little more bend in that cap"
4 hours ago
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…"
5 hours ago
Hal Skinner replied to Hal Skinner's discussion Rooftop A/C units and exposed ductwork in the group Radiant Control Coatings
"OK Tom, I think I am on the last questionow,,,I think.  LOL Going under the building and…"
6 hours ago
Hal Skinner replied to Hal Skinner's discussion Rooftop A/C units and exposed ductwork in the group Radiant Control Coatings
"Tom, sorry for having to break this up but my responses I guess are too long. You talking about the…"
6 hours ago
Hal Skinner replied to Hal Skinner's discussion Rooftop A/C units and exposed ductwork in the group Radiant Control Coatings
" "
8 hours ago
Hal Skinner replied to Hal Skinner's discussion Rooftop A/C units and exposed ductwork in the group Radiant Control Coatings
"I guess I got too mlong winded ther, it cut me off. 1.  Spray the coating on the ducts, plenum…"
8 hours ago
Kurt Shafer replied to Tom Conlon's discussion Whole House Fans - Love 'Em or Not?
"Jan, Here are some facts. the 30 inch fan from Home Depot (not one I would recommend) is rated at…"
8 hours ago
Hal Skinner replied to Hal Skinner's discussion Rooftop A/C units and exposed ductwork in the group Radiant Control Coatings
"Hi Tom. It looks like I will have to start off most of my answers to questions with this…"
9 hours ago

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