Item | Benchmark building (1980) | Reference building (meeting the energy efficiency standard) |
---|---|---|
Wall | U value of exterior wall—1.7 W/m2 K | U value of exterior wall—0.5 W/m2 K (cold region) U value of exterior wall—0.6 W/m2 K (hot-summer cold-winter region) |
Roof | U value of roof—1.26 W/m2 K | U value of roof—0.45 W/m2 K (cold region) U value of roof—0.40 W/m2 K (hot-summer cold-winter region) |
Window | U value of window—6.4 W/m2 K | U value of window—2.7 W/m2 K (cold region) U value of window—3.0 W/m2K (hot-summer cold-winter region) |
Air change rate | 1.5 times/h | 0.5 times/h (cold region) 1.0 times/h (hot-summer cold-winter region) |
Running time | 8/6 | 8/6 |
Cooling system | Central air conditioning, EER: COP3.1/EER2.2 | Central air conditioning, EER: COP5.2/EER3.2 |
Heat source (central heating) | Natural gas boiler, efficiency—0.8 | Natural gas boiler, efficiency—0.9 |
Pump | Constant volume | Constant volume |
Heating period | November 15 to March 15 (next year) (cold region) | November 15 to March 15 (next year) (cold region) |
Cooling period | June 15 to August 31 (cold region) | June 15 to August 31 (cold region) |