air conditioning principles steps please A more delailed discussion energy conse

Question

air conditioning principles

steps please

A more delailed discussion energy consers. tion in HVAC system design will be presented Chapter 15. n ovides a n. Some PROBLEMS A6 A building with a 120 ft by 80 ft roof, lokaed the in Cincinnati, Ohio, has a rool constructed d 1 in. wood with R-5.5 insulation and a sus- ign DB pended ceiling. The inside design oondilion is 78 F. Determine the net rok cooling load 8-80 F A. September 21 at noon yst B. Time of peak roof heat gain for 6.2 A southeast facing wall of a building located

Explanation / Answer

A) Area of roof top = 120*80 = 9600ft2 = 1.3824*106 in2

Thermal conductivity of R-5.5 = KR-5.5 = 0.00217 Btu/in h oF

Thermal conductivity of Wood = Kw = 0.00816 Btu/in h oF

Let us consider thickness of insulation =x1 = 1 inch

According to Fourier's law of heat conduction,

Q = [A*(To - Ti)]/[(x1/ KR-5.5)+(x2/Kw)]

To = 87.8oF .......(Ambient temperature at noon on september 21)

Ti = 78 oF

So, net roof coolin load, Q = 23222.521 Btu.

B) Time of peak roof heat gain is from noon to 5 pm.

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