Does a Bigger Volume Mean More Heating and Cooling Load?

Prime: 
prime

Subtitle: 
Many people answer this question incorrectly

Images: 

What happens to the heating and cooling loads when you encapsulate an attic? With the insulation and air barrierBuilding assembly components that work as a system to restrict air flow through the building envelope. Air barriers may or may not act as a vapor barrier. The air barrier can be on the exterior, the interior of the assembly, or both. at the ceiling below the attic, you’re excluding the attic space. That volume of air up there isn’t involved in the conditioning of the home. But when you move the enclosure to the roofline (usually by installing spray foam insulation beneath the roof deck), now the attic’s volume is included in the conditioned spaceInsulated, air-sealed part of a building that is actively heated and/or cooled for occupant comfort.

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Occasionally I hear people say the loads will be higher because of the extra volume. Does having more air inside really increase the loads?

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Does a Bigger Volume Mean More Heating and Cooling Load?

Prime: 
prime

Subtitle: 
Many people answer this question incorrectly

Images: 

What happens to the heating and cooling loads when you encapsulate an attic? With the insulation and air barrierBuilding assembly components that work as a system to restrict air flow through the building envelope. Air barriers may or may not act as a vapor barrier. The air barrier can be on the exterior, the interior of the assembly, or both. at the ceiling below the attic, you’re excluding the attic space. That volume of air up there isn’t involved in the conditioning of the home. But when you move the enclosure to the roofline (usually by installing spray foam insulation beneath the roof deck), now the attic’s volume is included in the conditioned spaceInsulated, air-sealed part of a building that is actively heated and/or cooled for occupant comfort.

.

Occasionally I hear people say the loads will be higher because of the extra volume. Does having more air inside really increase the loads?

read more

Buried Ducts Allowed in 2018 Energy Code

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prime

Subtitle: 
The keys are duct leakage, R-values, and the vapor barrier

Images: 

Water vapor from the air condenses on air conditioning ducts in humid climates. It’s as normal as poorly insulated bonus rooms making occupants uncomfortable or cigarettes causing lung cancer. Condensation on ducts is most common in crawl spaces and basements, where the air is more likely to have a higher dew point.

read more

Buried Ducts Allowed in 2018 Energy Code

Prime: 
prime

Subtitle: 
The keys are duct leakage, R-values, and the vapor barrier

Images: 

Water vapor from the air condenses on air conditioning ducts in humid climates. It’s as normal as poorly insulated bonus rooms making occupants uncomfortable or cigarettes causing lung cancer. Condensation on ducts is most common in crawl spaces and basements, where the air is more likely to have a higher dew point.

read more

Building Science Puzzles: The Jigsaw Approach

Subtitle: 
Tracking down performance problems is all about getting the building science right — and following the rules of jigsaw puzzles

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Just about every week, I get a call or an email that turns into a building science puzzle. While the problems are varied, how you solve them doesn’t change.

First, you understand how heat and moisture move through building assemblies. Second, you follow the advice of your spouse.

My wife of 27 years is a real master at jigsaw puzzles, and she would laugh to learn that I think of myself as a puzzle master of any sort, since I am useless at the jigsaw ones. But she completely agrees that I should use her method of solving jigsaw puzzles in my work on building science problems.

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