Load calculation Q2-Solar

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Concordia University *

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MISC

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Aerospace Engineering

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Oct 30, 2023

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12

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Cooling Load Calculations (Solar) • 𝑞 ?,𝑧??? 𝑡 = σ 1 𝑁 q 𝑤 (𝑡) + 𝑞 ??? 𝑡 + 𝑞 𝑖?? 𝑡 ?𝑖?ℎ??,??????,???𝑖????? +𝑞 𝑖?? 𝑡
Cooling Load Due to Solar Gains through Glass Solar heat gains entering the room are first absorbed by the enclosure surface, and later released to room air. 2 floor Enclosure walls q sol conduction UA(CLTD) cor 0 12 16 20 24 q cooling instantaneous solar gains light construction-zone type A heavy construction-zone type D The lag effects or thermal inertia effects are greater for buildings with massive walls than light (wood frame walls). Fall 2023 BLDG 471 Dr. M. Zaheeruddin
Cooling Load Due to Solar Gains through Glass: • Zone Type: Determine the zone type from the four groups designated by ASHRAE. Such as Type A (low mass), Type B, Type C, Type D (high mass) from appropriate Tables 8-25a to 8-25e. • SCL factor: With the zone type thus established, read the SCL factor from Table 8-24 • SC (shading coefficient) can be read from Table 6-4 𝑞 ????𝑖??,𝑤𝑖???𝑤? 𝑡 = ൰ ? ∙ ?? ∙ ( ) ??𝐿(𝑡 ???𝑎? ????𝑖?? ??𝑎? ?𝑎???? ???𝑎? ?𝑎?𝑖𝑎?𝑖?? ???? . + ) ? ∙ ? ∙ (?𝐿?? ??? ???????𝑖?? ???? . Fall 2023 BLDG 471 Dr. M. Zaheeruddin 1. Solar radiation component 2. Conduction Component ▪ Cooling load due to conduction through glass can be determined using the same procedure as for the walls and roofs. The CLTD for glass is given in Table 8-23, and the U values are listed in Table 5-8a.
4 Fall 2023 BLDG 471 Dr. M. Zaheeruddin
5 Fall 2023 BLDG 471 Dr. M. Zaheeruddin
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