iv) The annual space-heating energy requirements for occupied and unoccupied hours. (b) Discuss your result.

Table 1: Building operation and heat pump performance data. 240,000 73 70 Winter design heat loss, In,d (Btu/hr) Winter design temperature difference, ATA (F) Indoor set point temperature, T: (F) occupied unoccupied Occupancy Internal gains, 9g Btu/hr) occupied unoccupied 65 Monday-Friday from 7:00 am to 6:00 pm Unoccupied other hours and days of the week 50,000 4000 Acond = 17,200 + 3857, + 2.5472 Wcomp = 1.28 + 0.00931, -0.0000857,2 Air-to-Air heat pump performance characteristics Where To = the outdoor temperature (F) cond = the heat output from the condenser (Btu/hr) Wcomp = power input to the compressor (kW) Table 2: Annual bin data by observation hour group for select temperatures. Avg. Bin Temp (F) 62 57 52 47 42 37 32 27 22 17 12 7 2 -3 -8 -13 -18 -23 Group I (1am-8am) 276 295 264 253 291 304 299 245 187 119 72 41 25 11 7 3 1 1 Group II (9am-4pm) 245 237 244 228 193 166 158 120 73 40 24 17 10 5 1 0 1 0 Group III (5pm-12pm) 273 244 231 248 268 254 247 190 134 84 41 26 19 6 5 2 1 0 Table 1: Building operation and heat pump performance data. 240,000 73 70 Winter design heat loss, In,d (Btu/hr) Winter design temperature difference, ATA (F) Indoor set point temperature, T: (F) occupied unoccupied Occupancy Internal gains, 9g Btu/hr) occupied unoccupied 65 Monday-Friday from 7:00 am to 6:00 pm Unoccupied other hours and days of the week 50,000 4000 Acond = 17,200 + 3857, + 2.5472 Wcomp = 1.28 + 0.00931, -0.0000857,2 Air-to-Air heat pump performance characteristics Where To = the outdoor temperature (F) cond = the heat output from the condenser (Btu/hr) Wcomp = power input to the compressor (kW) Table 2: Annual bin data by observation hour group for select temperatures. Avg. Bin Temp (F) 62 57 52 47 42 37 32 27 22 17 12 7 2 -3 -8 -13 -18 -23 Group I (1am-8am) 276 295 264 253 291 304 299 245 187 119 72 41 25 11 7 3 1 1 Group II (9am-4pm) 245 237 244 228 193 166 158 120 73 40 24 17 10 5 1 0 1 0 Group III (5pm-12pm) 273 244 231 248 268 254 247 190 134 84 41 26 19 6 5 2 1 0