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Homework #2

Homework #2. Review. Enthalpy. Interior design temperature 75F @ 50% RH Outside design temperature 98F @ 78F WB . .017. .009. 75. 98. 75F @ 50% RH. .009. .017. 98F @ 78F WB. Sensible and Latent Gains. sensible load. latent load. cooling load components.

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Homework #2

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  1. Homework #2 Review

  2. Enthalpy

  3. Interior design temperature 75F @ 50% RH Outside design temperature 98F @ 78F WB

  4. .017 .009 75 98

  5. 75F @ 50% RH .009 .017 98F @ 78F WB

  6. Sensible and Latent Gains sensible load latent load cooling load components conduction through roof, walls, windows, and skylights solar radiation through windows, skylights conduction through ceiling, interior partition walls, and floor people lights equipment/appliances infiltration ventilation system heat gains

  7. Step #1 – Select Wall Type

  8. Step #2 • Select Sun time • Select color of wall • D = dark • L = light • Select wall orientation

  9. Step #3 – Read Value of TETD

  10. For Windows • Btuh = (U x A x TD) + (A x SC x SHGF) • A= Area • TD = outdoor design – indoor design temp. • SC = shading coefficient • SHGF = solar heat gain factors

  11. EQ Credit 8.1 - Daylighting • ASHRAE Standard 90.1 • 10% lighting load credit for harvesting • 10% lighting load credit for occupancy sensors

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