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Table 3 Comparison table of the thermal performance parameters of typical buildings (self-reported)

From: Research on technology clusters and the energy efficiency of energy-saving retrofits of existing office buildings in different climatic regions

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)
  1. The heating and cooling in hot-summer cold-winter regions aim to meet the standards for thermal comfort, so the settings are in line with the comfortable temperatures in summer and winter prescribed by the specification