Cooling Load-Air Infiltration (1)

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Concordia University *

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MISC

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Mechanical Engineering

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Oct 30, 2023

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Zone Cooling Load Air Infiltration ? ?,𝑧??? ? = ෍ 1 𝑁 q ? (?) + ? ??? ? + ? 𝑖?? ? ?𝑖?ℎ?,??????,???𝑖????? + ? 𝑖?? ?
Air Infiltration Calculation Methods Two Methods to Estimate ? (Air Infiltration Rate) 2 Air Exchange Method (ACH) Crack Length Method Fall 2023 BLDG 471 Dr. M. Zaheeruddin
Air Exchange Method (ACH) ACH: air changes per hour (based on experience) Assume a building undergoes 1 ACH due to infiltration: 3 ? = # ?? 𝐴𝐶𝐻 ∗ 𝑉????? ?? ???? (?? 𝑧???) 60 in CFM minutes/hour Fall 2023 BLDG 471 Dr. M. Zaheeruddin
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Cooling Load Due to Air Infiltration Both sensible and latent loads are assumed to be instantaneous loads, CLF=1.0 Let ? rate of air infiltration, cuft/min (cfm) c p specific heat of air, BTU/lb ° F ν specific volume of air, cuft/lb 4 ? ?,𝑖??,? ? = ሶ? 𝑎 ? ?𝑎 ? ? − ? 𝑖 𝐶𝐿𝐹(?) = ( ? ? )? ?𝑎 ? ? − ? 𝑖 BH =1, instantaneous ? ?,𝑖??,? ? = ??? ∗ 1.08 ∗ ? ? − ? 𝑖 BH sensible ? All instantaneous load Fall 2023 BLDG 471 Dr. M. Zaheeruddin
Latent Cooling Load Due to Air Infiltration ifg: latent heat of vaporization at indoor conditions w: humidity ratio 5 ? ?,𝑖??,? ? = ( ? ? ) ∗ 𝑖?? ∗ 𝑤 ? − 𝑤 𝑖 BH ? ?,𝑖??,? ? = ??? ∗ 4840 ∗ 𝑤 ? − 𝑤 𝑖 BH lbm/lba Fall 2023 BLDG 471 Dr. M. Zaheeruddin
Crack Length Method 6 ? = 𝐴𝐶(∆?) ? A: leakage area C: flow coefficient n: flow exponent ∆? = ? ? − ? 𝑖 ; consists of three components ∆? = ∆? ? + ∆? ?? + ∆? ? ; n ? (∆?) Fall 2023 BLDG 471 Dr. M. Zaheeruddin
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a) ∆𝑷 𝒘 (wind effect) 7 ∆? ? = 𝜌 2? ? ( 𝑉 ? 2 𝑉 ? 2 ) 𝑉 ? : wind velocity far above 𝑉 ? : wind velocity at the building boundaries Define: ? ? = ∆? 𝑤 ∆? 𝑤𝑡 ∴ ∆? ? = ? ? 𝜌 2? 𝑐 𝑉 ? 2 ? ? : pressure coefficient ∆? ?? : theoretical ∆? ? when 𝑉 ? = 0 ? ? values are given in figures 6-3 and 6-4 (Textbook) windward leeward Fall 2023 BLDG 471 Dr. M. Zaheeruddin
b) ∆𝑷 ?? (stack effect - theoretical) 8 exfiltration infiltration winter infiltration exfiltration summer Mid-height NPL Neutral Pressure Level Fall 2023 BLDG 471 Dr. M. Zaheeruddin
b) ∆? ?? (stack effect - theoretical) 9 ∆? ?? = ? ? ℎ? ? 𝑎 ? ? ( 1 𝑇 ? 1 𝑇 𝑖 ) ? ? : outdoor pressure h: height from NPL T: temperature ? 𝑎 : gas constant ? ? : gravity acceleration ? ? : draft coefficient ∆? ? : actual stack effect Define: ? ? = ∆? ? ∆? ?? ? ? is assumed between 0.6-0.8. Fall 2023 BLDG 471 Dr. M. Zaheeruddin
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c) ∆𝑷 𝒑 (building pressurization) 10 ∆? ? = 1 3 (∆? ? ) Assume: Note: for low − rise buildings ≤ 3 stories , the stack effect is neglected. Fall 2023 BLDG 471 Dr. M. Zaheeruddin
𝑹?𝒂?𝒊𝒏𝒈 𝑴𝒂???𝒊𝒂𝒍 11 Review Examples 6-1, 6-2, and 6-3 from the Textbook Fall 2023 BLDG 471 Dr. M. Zaheeruddin

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