Research Article
Research on the Efficiency and Economic Impact of Energy-Saving Transformation of Residential Buildings in Different Climatic Regions of China
Table 4
Comparisons between heating expenses before and after transformation of existing residential buildings in Harbin (self-drawing).
| | Harbin | Benchmark building (1980) | Roof transformation | Wall transformation | Window transformation | Reference building (meeting energy efficiency standard) |
| | Heating: natural gas (kWh/m2) | 184.83 | 181.47 | 166.81 | 106.55 | 84.17 |
| | Heating expense (Yuan/m2) Note: with heat metering | 45.25 | 44.78 | 42.72 | 34.29 | 31.15 |
| | Actual charge | 40.35 | 40.35 | 40.35 | 34.29 | 31.15 |
| | Technical information | | | | | | | | | | | | | | | | | Air change rate: 1.5 times/hour | | | Air change rate: 0.5 times/hour | Air change rate: 0.5 times/hour |
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