THE NEXT SEVEN (7) QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: A house with a flat roof measures 40' x60' by 15' high. There are six 3' x6' windows and two 3'x8' doors. The indoor temperature is 70"F, and the outdoor temperature is 10"F. Wall construction: 1/2" (12.7 mm) Wood siding 1/2" (12.7 mm) Ply sheathing 5.5" (140 mm) Studs & batt insulation 1/2" (12.7 mm) Drywall (note: assembly R-value shown in Figure 6.2) Roof construction: R12 (thermal resistance of R= 12) Doors: R4 Windows: Assume that it is necessary to maintain the 60F temperature differential 24 hours a day for two months (61 days). You may neglect air leakage and assume that the furnace operates at 80% efficiency (in other words. the furnace must produce 25% more heat than the desired temperature requires). Natural gas in Ontario costs $4 per million BTU. 14. What is the conduction heat loss from the roof? (1) 14,000 BTU/HR (2) 1,000 BTU/HR (3) 144,000 BTU/HR (4) 12.000 BTU/HR 15. What is the conduction heat loss from the walls? Note that this wall assembly's R-value is given in Table 6.2 in Chapter 6 of the Course Manual (1) 8,532 BTU/HR (2) 8,856 BTU/HR (3) 9.954 BTU/HR (4) 8,676BTU/HR 16. What is the conduction heat loss from the doors? 350 BTU/HR 720 BTU/HR (3) 980 BTU/HR (4) 280 BTU/HR 17. What is the conduction heat loss from the windows? (1) 3,240 BTU/HR (2) 2,940 BTU/HR (3) 2,400 BTU/HR (4) 4,200 BTU/HR 18. What is the total heat loss? (1) 21,252 BTU/HR (2) 22,440 BTU/HE (3) 24,816 BTU/HR (4) 24,492 BTU/HR 19. Given that the furnace is not 100% efficient, what output is necessary to meet the heat loss from the house? (1) 20,352 BTU/HR (2) 30,615 BTU/HR (3) 25,440 BTU/HR (4) The efficiency of the furnace is not relevant in determining the necessary output. 20. What is the cost of natural gas for the two months (61 days)? (1) $186.22 (2) $195.22 (3) $179.28 (4) $176.34