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Roof, Glass, and Wall Types

Tuesday, January 19th, 2010

The roof, glass, and wall types for the HVAC building load calculations are taken from the 1997 ASHRAE Fundamentals. Our calculations use the CLTD method. In the 2001 Fundamentals, the load calculation chapter was changed to use the RTS method. The CLTD method is acknowledged as still valid.

The roof types are taken from 1997 ASHRAE Handbook, Fundamentals, Table 31, page 28.42.

The glass zone types are taken from 1997 ASHRAE Handbook, Fundamentals, Table 35B, page 28.49.

The wall types are taken from 1997 ASHRAE Handbook, Fundamentals, Table 33A, pages 28.46-48.

The names for the default types are abbreviations. If you have trouble figuring out our system, there is a full description for each type that is displayed when you select it.

2 Responses to “Roof, Glass, and Wall Types”

  1. Adrienne says:

    Does DM intend on updating their calculation method to RTS?

  2. No, we do not have any plans to update to RTS. The difference between RTS and CTLD is small. Modern energy codes are so strict that envelope loads are a small portion of the total load on a building. Converting to RTS is a major programming task. We’ve decided that other improvements to our software would be more beneficial to more users.

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