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    Car Park Ventilation

    Uploaded by

    BayhonElmer
    The document discusses ventilation requirements for a parking garage based on CO demand and compares it to the standard ventilation requirement of 1 CFM/sq ft. It also provides the electrical load calculations for air conditioning systems in retail and office spaces. For a bus platform, ventilating at the standard rate of 17 CFM/sq ft would require an unrealistic CFM of over 880,000. An alternative ventilation method or area should be considered.

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    Attribution Non-Commercial (BY-NC)
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    Car Park Ventilation

    Uploaded by

    BayhonElmer
    2K views3 pages
    The document discusses ventilation requirements for a parking garage based on CO demand and compares it to the standard ventilation requirement of 1 CFM/sq ft. It also provides the electrical load calculations for air conditioning systems in retail and office spaces. For a bus platform, ventilating at the standard rate of 17 CFM/sq ft would require an unrealistic CFM of over 880,000. An alternative ventilation method or area should be considered.

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    The document discusses ventilation requirements for a parking garage based on CO demand and compares it to the standard ventilation requirement of 1 CFM/sq ft. It also provides the electrical load calculations for air conditioning systems in retail and office spaces. For a bus platform, ventilating at the standard rate of 17 CFM/sq ft would require an unrealistic CFM of over 880,000. An alternative ventilation method or area should be considered.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as XLS, PDF, TXT or read online from Scribd
    Download as xls, pdf, or txt
    2K views3 pages

    Car Park Ventilation

    Uploaded by

    BayhonElmer
    The document discusses ventilation requirements for a parking garage based on CO demand and compares it to the standard ventilation requirement of 1 CFM/sq ft. It also provides the electrical load calculations for air conditioning systems in retail and office spaces. For a bus platform, ventilating at the standard rate of 17 CFM/sq ft would require an unrealistic CFM of over 880,000. An alternative ventilation method or area should be considered.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as XLS, PDF, TXT or read online from Scribd
    Download as xls, pdf, or txt
    of 3
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    The document discusses parking garage ventilation requirements, electrical requirements for air conditioning systems in different spaces, and issues with calculating bus platform ventilation based solely on airflow per square foot.

    For retail spaces, the document states the chiller requires 220 W/m^2, air requires 8 W/m^2, and pumps require 3.1 W/m^2, totaling around 80-90 W/m^2 for the air conditioning system.

    For office spaces, the document states the chiller requires 44 W/m^2, air requires 8 W/m^2, and pumps require 3.1 W/m^2, totaling around 55.1-60 W/m^2 for the air conditioning system.

    Per ASHRAE Applications 2003Ch.

    12
    Parking Garage Ventilation Requirements
    and NFPA 88A

    CO Demand Ventilation Control vs. Standard Ventilation

    & travel time / car seconds

    AT 1 CFM /SQ. FT. TOTAL CFM =


    L/S TOTAL based on CO demand

    L/S TOTAL based on 1 cfm/ft 2


    N

    CFM @ 25 ppm CO
    % cars in operation

    Q ( CFM/FT2 )
    ( Af )
    Operating # of Cars
    Total # of Cars
    Parking Level

    ventilation
    Area m 2

    Height ft
    Ht. M

    ACH
    Av. Time of operation

    f
    Area ft 2
    B1 521 0.5 260.5 22,800 245,328 5 16.40 180 0.002 29.09 0.71 2.61 175,112 82,302 245,328 115,304
    521 22,800 245,328 175,112 82,302 245,328 115,304

    1. Average cold emission in winter & Summer E = 1.5 Ib/hr


    2. Peak Generation Rate G = NE/Af Ib/h*ft2 for parking garage per unit floor area
    3. Normalized value of generation using reference value G0 = 5.46 X 10 -3 Ib/h*ft2 f = 100 * G/G0
    4. Q = C*f*Seconds CFM/FT2
    5. Maximum level of CO concentration C = 1.363 x 10 -4 cfm/ft2 * seconds for 25 ppm CO

    6 air changes per hour is no longer a valid criteria - per NFPA 88A 1 cfm / ft2 is needed.
    Electrical Requirements for Air Conditioning Systems
    Given via phone to Nabil Guindi on January 28, 2001

    Retail
    Chiller 220 W/m2
    160 ft2/Ton
    16m2/Ton
    1.1 kw /ton
    16/1.1 = 14.545 m2/kw
    0.0687 kw/m2
    68.7 W/m2

    Air 8 W/m2
    1000 cfm = 1 HP
    @ 1 cfm / ft2
    HP = 10.79 cfm/m2 / 1000 = 0.01079 hp * 746 w = 8W/m2

    Pumps 3.1 W/m2


    HP/Ton = 20/300 = 0.066 Hp/ Ton* 746 = 49.7 W/Ton / 16 m2 = 3.11 W/m2
    (Previous experience)
    Total = 68.7 + 8 + 3.1 = 80 W/m2 X 110%

    Say 90 W / m2

    Offices
    Chiller 44 W/m2
    250 ft2/Ton
    25 m2/Ton
    1.1 kw /ton
    25/1.1 = 22.7 m2/kw
    0.044 kw/m2
    44 W/m2

    Air 8 W/m2
    1000 cfm = 1 HP
    @ 1 cfm / ft2
    HP = 10.79 cfm/m2 / 1000 = 0.01079 hp * 746 w = 8W/m2

    Pumps 3.1 W/m2


    HP/Ton = 20/300 = 0.066 Hp/ Ton* 746 = 49.7 W/Ton / 16 m2 = 3.11 W/m2
    (Previous experience)
    Total = 44 + 8 + 3.1 = 55.1 W/m2 X 110%

    Say 60 W / m2
    BUS PLATFORM VENTILATION BASED ON 17 CMF / FT2

    AREA CFM / FT2 CFM


    52186 17 887162

    NOT REALISTIC
    FIND ANOTHER METHOD OR TAKE ANOTHER AREA FOR PLATFORM

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