Tom Mallard
  • Bellevue, WA
  • United States
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Tom Mallard's Discussions

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
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 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
Tom Mallard replied to Tom Delconte's discussion Energy Savings that Are Hot Air!
"For wood-frame residential the easiest way to improve things is under floors remove the batting, add in pipes with water for thermal mass and duct heat by them on the way to the room and insulate below the joists to close it off. How you collect or…"
Jan 25
Tom Mallard replied to Tom Delconte's discussion Energy Savings that Are Hot Air!
"This is a thermal model run of 400-minutes, 20C delta-T between a standard wall and the same wall with 1-1/2" insulation board added below the siding with 1/2" furring to allow condensation to drip down and increases thermal resistance 3-4…"
Jan 23
Bill Bradbury replied to Tom Mallard's discussion Standard Wall Thermal Upgrade Analysis
"Thanks for the link, this is a great app! We do lime plaster finishes on our historic restorations, so adding hemp is a no-brainer; thanks for the suggestion."
Dec 2, 2013
Tom Mallard's discussion was featured

Standard Wall Thermal Upgrade Analysis

The left is a standard wall, 3/4" siding, 1/2" sheathing, batt insulation and 1/2" sheetrock, if you remove the siding and apply 1-1/4" of…See More
Oct 15, 2013
Tom Mallard replied to Bud Poll's discussion Does infiltration really reduce the r-value of our insulation?
""Air conditioning" to me is really antiquated for desert living where wind-solar can provide the cold and thermal-fluids are how to move it to rooms, not air, this about 10-times more thermally efficient moving the fluid, then pumping the…"
Oct 11, 2013
Tom Mallard posted a discussion

Standard Wall Thermal Upgrade Analysis

The left is a standard wall, 3/4" siding, 1/2" sheathing, batt insulation and 1/2" sheetrock, if you remove the siding and apply 1-1/4" of…See More
Oct 7, 2013
Tom Mallard replied to Bud Poll's discussion Does infiltration really reduce the r-value of our insulation?
"Joe's comment on roofs adds to my preference as an upgrade to remove the siding, add insulation board boxing out for windows-doors-vents, adding an air gap to allow condensation to drip to the ground behind the siding that's…"
Jul 18, 2013

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Jun 18, 2013
Tom Mallard commented on Jim Peck's blog post Natural Draft Orphaned Hot Water Heater
"An aside on solar-thermal, consider that solar-thermal to pay back needs to supply more heating needs and to do that systems likely need to use thermal-fluids, these stay fluid from -30F to 550F so allow the system to store ~550F in the…"
Feb 7, 2013
Tom Mallard replied to James White's discussion Russian Wood Stoves (Masonry Stoves)
"So, adding, the air circulations within the home then become an interest. I have a lot of ideas of how to move the excess heat at the ceiling to the floor as the temp-delta is highest. For wood framing it can be taken off in vents down a wall and…"
Dec 21, 2012
Tom Mallard replied to James White's discussion Russian Wood Stoves (Masonry Stoves)
"These remind me of adobe home designs as well, very nice indeed."
Dec 7, 2012
Tom Mallard replied to James White's discussion Russian Wood Stoves (Masonry Stoves)
"I'm taking, "From what I know it's main feature is a ton of thermal mass, not miracles." as the point needing attention, what thermal-mass is being heated. My schemes to do this always involve moving the hot air at the ceiling to…"
Nov 29, 2012

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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