HVAC Systems Design Handbook by Editors

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The psychrometric chart changes are described in Chap. 19. com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. org. Abstracted by permission from ASHRAE Handbook, 1993 Fundamentals, Chap. 24, Table 1. com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. 3 33 Air Factor Change with Altitude (Approximate Values at 60؇F) includes an air density effect.

2 is a list of data for a few selected sites. The ASHRAE Handbook 2001 Fundamentals1 lists data for over 1000 sites in North America and throughout the world. 0 percent values, except use a median of annual extremes for certain critical heating applications. Note that the maximum wet-bulb (wb) temperature seldom occurs at the same time as the design dry-bulb (db) temperature. For sites not listed, data may be obtained by interpolation, but this should be done only by an experienced meteorologist.

The ASHRAE Handbook4 provides tables covering a number of combinations. 25 (pp. 54–58). 8 (p. 25. Additional information is available from the glazing manufacturers. These data are best obtained by means of a solar calorimeter, in which the glazing-shading combination is measured against unrestricted solar transmission. The value of the SC must be matched against the need to see through the glazing and the use of daylighting to minimize lighting energy use. The maximum solar heat gain factor (MSHGF) is a function of orientation, time of day, and latitude.

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