Table 1.
The design parameters of the building towers in the case study.
| Unit | Tower A | Tower B | Tower C | |
|---|---|---|---|---|
| Location | – | City district in Hong Kong | ||
| Total gross floor area (GFA)a | m2 | 77,000 | 77,000 | 84,000 |
| Total air-conditioned area | m2 | 50,000 | 50,000 | 54,500 |
| Number of stories | – | 30 | 30 | 30 |
| (SA:14; office:16) | (SA:14; office:16) | (All office premises) | ||
| Aspect ratio | Length/depth | 1.91 | 1.91 | 1.91 |
| Orientation | Degrees | 335 | 335 | 335 |
| Window U-value (N,S,E,W) | W/m2 K | 2.67 | 2.67 | 2.67 |
| Window SHGCb(N,S,E,W) | – | 0.635 | 0.635 | 0.635 |
| Wall U-value (N,S,E,W) | W/m2 K | 3.3 | 3.3 | 3.3 |
| Window-to-wall ratio (N,S,E,W) | – | 0.79 | 0.79 | 0.79 |
a
Gross floor area is a statutory building parameter measured to the external walls of building without deductions for lift, stair voids and other openings.
b
SHGC = Solar heat gain coefficient.