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Owner Jim Lavallee P+H

Lavsplumbing
Member Posts: 2
What is the origin and definition of the manual J calculation?
0
Comments
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It's also known
as a "heat-loss calculation".
I believe it originated with the American Society of Heating and Ventilating Engineers (ASHVE) which later added refrigeration and air-conditioning and became ASHRAE.
Originally the calculations were done with pencil and paper, which probably explains why so much equipment is oversized- no one wanted to take the time to do the calcs. But the personal computer revolution has brought us programs that you can install on a laptop and take to the job with you, so there's no more excuse for not calculating every job.All Steamed Up, Inc.
Towson, MD, USA
Steam, Vapor & Hot-Water Heating Specialists
Oil & Gas Burner Service
Consulting0 -
Manual J definition
What is the definition of manual J?0 -
J is
the letter they used to name the heat-loss calculation procedure manual. It's just a name, nothing special about it.All Steamed Up, Inc.
Towson, MD, USA
Steam, Vapor & Hot-Water Heating Specialists
Oil & Gas Burner Service
Consulting0
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