Document N0Ev7oxMgL087m5GqwKywv0y

American Society of Heating and Ventilating Engineers Guide, 1932 6. Inside air temperature at roof: The air temperature just below roof is higher than at the breathing line. Height of roof is 16 ft, or it is 16 -- 5 = 11 ft above breathing line. Allowing 2 per cent per foot above 5 ft, or 2 X 11 = 22 per cent, makes the tem perature of the air under t}ie roof = 1.22 X 60 = 73.3 F. 7. Inside temperature at walls: The air temperature at the mean height of the walls is greater than at the breathing line. The mean height of the walls is 8 ft and allowing 2 per cent per foot above 5 ft, the average mean temperature of the walls is 1.06 + 60 = 63.6 F. By similar assumptions and calculations, the mean temperature of the glass will be found to be 64.2 F and that of the doors 61.2 F. 8. Average wind velocity (Table 3). .11.0 mph 9. Over-all dimensions (See Fig. 1) 120 x 50 x 16 ft 10. Construction: Walls--12-in. brick, with J+in. plaster applied directly to inside surface. Roof--3-in. stone concrete and built-up roofing. .... Floor--5-in. stone concrete on 3-in. cinder concrete on dirt. Doors--One 12 ft x 12 ft wood door (2 in. thick) at each end. Windows--Fifteen, 9 ft x 16 ft single glass double-hung windows on each side. 11. Transmission coefficients: Walls--(Table 9, Chapter 3)........... Roof--(Table 29, Chapter 3)........... Floor--(Table 28, Chapter 3).......... Doors--(Table 33B, Chapter 3)..... Windows--(Table 33A, Chapter 3) U = 0.277 U = 0.610 U = 0.521 U = 0.382 V = 1.13 12. Infiltration coefficients: Windows--Crack assumed H 6 in. The leakage per foot of crack for an 11-mile wind velocity is 92.7 cfh, for a plain window. (By interpola tion from Table 2, Chapter 4). The heat equivalent per hour per degree is 92.7 X 0.075 X 0.24 = 1.67 Btu Doors--Assume infiltration loss through door crack twice that of windows or 2 X 1.67 = 3.34 Btu 13. Calculations: See calculation sheet, Table 4. Residence. (See Fig. 2.) 1. Location...............................;.....................................................:............................Chicago, 111. 2. Lowest outside temperature (Table 3)...................:.................... -.......... -......-- 23 F 3. Base temperature.............................. -......'........ .............................. (-- 23 + 15) = -- 8F 4. Direction of prevailing Wind (during Dec., Jan., Feb., Table 3)............ Southwest' 5. Inside temperature...................................... -.................:................................................70 F 6. Temperature difference (item 5 -- item 3).....1....:..:................. ....................... '--78 V 7. Average wind velocity (during Dec., Jan., Feb., Table 3) Chapter 2--Estimating Heat Losses 8. Construction: Walls--Wood siding, building paper, wood sheathing, studding, wood lath and plaster. Roof--Wood shingles on 1 x 4 strips spaced 2 in. Attic Ceiling--Wood lath and plaster on roof rafters First Floor (over basement)--Maple flooring on rough flooring on floor joists Doors (outside)--Three, 3 ft x 7 ft x Iff in.; one, 2 ft 8 in. x 7 ft x 1% in. No weatherstripping Windows--Double-hung, single glass, weatherstripped. 9. Transmission coefficients: Walls--(Table 21, Chapter 3)......... ......... ...................................... U -- 0.262 Roof (including attic ceiling)--(Table 31, Chapter 3)................. U = 0.288 Floor (over basement)--(Table 26, Chapter 3).......................... U = 0.339 Fig. 2. Floor Plan 6f Six-Room Residence (Plan 6*F-3, Architects Small House Service Bureau.) Doors--(Table 33B, Chapter 3)........ ............................................ V = 0.421 Windows--(Table 33A, Chapter 3)... ............................................ V = 1.13 10. Infiltration coefficients: Windows--The leakage per foot of crack for weatherstripped, doublehung, wood sash windows is 27.7 cu ft per hour for a 17-mile wind velocity. (By interpolation from Table 2, Chapter 4). The heat equivalent is 27.7 X 0.075 X 0.24 = 0.5 B tu per hour per foot of crack. Doors--Assume JJs in. crack. Leakage = 139 cu ft per hour. (Table 2, Chapter 4). The heat equivalent is . 139 X 0.075 X 0.24 = 2.50 Btu per hour per foot of crack. 1L Calculations: See summary of heat loss calculations, Table 5-A, and heat loss calculation sheet for living room. Table 5-B. 21. \