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Keep up to dateTable 1: U-values for a typical three bedroom apartment | ||
Typical 3-bed flat, mid terrace, mid-floor | U-value (W/m2K) | |
Total floor area | 70 m2 | |
Window area(aluminum frame, double glazed, low e) | 7 m2 | 2·6 |
External walls | 28 m2 | 0·35 |
Room height | : 2·3 m | |
41% of flat is living area (combined kitchen/dining/living area) |
Table 2: Comaprison of glazing to floor ratio and window u-values | |
U-value (W/m2K) | % glazing to floor area |
2·2 (elemental minimum U-value) | 16·5 |
2·4 (double glazing, low e, argon filled) | 15·1 |
2·6 (double glazing, low e) | 13·8 |
3·3 (double glazing, argon filled) | 10·7 |
3·4 (double glazing) | 10·4 |
1·8 (triple glazing, low e, argon filled) | 20·6 |
Assumes wall U-value of 0·35 W/m2K and electric heating. |
Table 3: Comparison of the emissions of electric heating to gas based systems | |||
Option 1 | Option 2 | Option 3 | |
Gas-fired condensing combi boiler | Electric storage heaters, electric water heaters 140 litre storage, 2002 CO2 emissions | Community heating – gas-fired boiler | |
SAP | 120 | 98 | 120 |
Running cost (£) | 93.72 | 135.94 | 93.31 |
Carbon index | 9·6 | 7·4 | 9·1 |
CO2 kg/year | 869 | 1565 | 1033 |