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23 February, 07:43

use engineering judgement to estimate the size of cooling and heating equipment that is needed for a three story, 31,000 square foot classroom building

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  1. 23 February, 09:53
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    Answer: operating cost = 22820.736 $

    Energy = 32.291 KBtu/sf.

    Explanation:

    Total heating load is given as = 31000 * 31.25

    = 968.75 * 103 Btu

    From the cooling capacity application;

    If 1000ftsquare = 2.8 TR

    Therefore 30000ftsquare = x

    Where x is the total cooling load,

    Therefore x = (30000 * 2.8) / 1000

    x = 84TR.

    Therefore, the total cooling load, x = 84TR

    Using conversion factor;

    i. e. converting Btu/hr to MBH

    1 MBH = 1000 Btu per hour

    we have 968.75 * 103 Btu/hr = 968.75 MBH

    let us proceed.

    Estimating the "Annual operating cost" we first calculate the maximum operating cost (Avg/Annum)

    For cooling load:

    Max. operatn. Cost = 14 * 84 = 1176$

    For heating load:

    The average heating loading hours = 1000 hrs.

    Conversion to Btu/yr gives = 968.75 * 103 * 1000

    = 968.75 * 106 Btu/yr.

    Conversion of 968.75 * 103Btu to Kwh gives

    1Btu = 0.000293

    968.75 * 103 Btu = 283.84 Kwh

    Therefore, average cost gives;

    (8.04/100) $ = 1Kwh

    X = 283.84*103

    X = 22820.736 $

    Operating cost = 22820.736 $

    Energy use in KBtu/sf is given as

    E = 968.75 * 103 / 30000

    E = 32.291 KBtu/sf.
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