MCEG 4463 HVAC-Heat Load Problem #1-due next period [2/1/18] Names [ 2] Calculat
ID: 2073846 • Letter: M
Question
MCEG 4463 HVAC-Heat Load Problem #1-due next period [2/1/18] Names [ 2] Calculate the design heat load for a small school in Denver, Colorado (AP) It has a footprint of 100 feet by 200 feet with 100 SF of office space in that area. There are 500 students in the school. Assume that the glass area is 30% of the overall gross opaque wall area without glass. Assume that the infiltration is 0.80 Air Changes per hour (ACH). Assume one story. 10 foot wall height. The window are single-glazed-Aluminum frame. The unheated slab floor has 12 inch of vertical insulation (R= 10 hr- 2-F/Btu) T inside = 70F Other information: Total OPAQUE WALL [includes inside/outside film resistance] R-factor (hr-ft-F/btu) Walls: 13 Roof: 3 inch concrete, 2 inch polystyrene, Metal roof truss. Flat Calculate the Design Heat Load (btu/hr)Explanation / Answer
Given foot print is 100feet by 200 feet .Height of the wall is 10 feet.
First find ARea BTU = length * width *31.25
= 100*200*31.25
= 625000
then find window BTU ;
BTU for single glazed aluminimum frame is 54594 btu/hr
Then find occupant BTU = number of people * 600 (assume 600 BTU/person)
= 500*600 = 300000 BTU
Therefore total heat load BTU/hr = (625000+30000)/10 + 54594
979594 BTU/hr
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