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

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.