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| Table 2: Cost comparison | ||
| Fan coil unit | Reverse cycle water based heat pump | |
| Shell and core: all figures in terms of gross internal floor area (gifa) | ||
| Disposal installation – condensate drainage | 1.50 | 1.50 |
| Heat source – gas fired boilers, gas supply, twin walled stainless steel flues | 7.00 | – |
| LTHW installation | ||
| Pipework distribution in plantrooms and risers, pumps, pressurisation unit, water treatment, insulation | 8.00 | - |
| Allowance for heating to ahu | – | 1.00 |
| CHW installation | ||
| Roof mounted, air cooled packaged chiller plant, pipework distribution in plantrooms and risers, pumps, pressurisation unit, water treatment, insulation | 25.00 | - |
| External heat pump units | – | 17.00 |
| Polyethylene pipework distribution in risers, pumps etc | – | 5.00 |
| Allowance for cooling to ahu | – | 2.50 |
| Air handling plant | ||
| Supply/extract air handling plant, ductwork to plantrooms/risers, insulation | 22.00 | 22.00 |
| Electrical installation – allowance for electrical supplies to mechanical plant | 3.00 | 2.00 |
| Controls installation | ||
| Head end supervisor, motor control centres, outstations, sensors, controls and all power and controls wiring | 13.00 | 10.00 |
| Total shell and core cost | 79.50 | 61.00 |
| £/m² (nia) | £/m² (nia) | |
| Category A fit out: all figures expressed in terms of net internal area (nia), based on a net:gross efficiency of 75% | ||
| Disposal installation – condensate drainage | 4.00 | 4.00 |
| LTHW Installation | ||
| LTHW distribution, pipework, insulation, connections to fan coil units | 20.00 | – |
| CHW installation | ||
| Chilled water distribution pipework, insulation, | ||
| connections to fan coil units | 30.00 | – |
| Ceiling mounted fan coil units | 23.00 | – |
| Internal heat pump units | – | 53.00 |
| Polyethylene pipework distribution, connection to heat pump units | – | 22.00 |
| Air handling installation | ||
| Supply and extract ductwork, insulation grilles and diffusers | 41.00 | 41.00 |
| Electrical installation - allowance for electrical supplies to mechanical plant | 4.00 | 9.00 |
| Controls installation | ||
| Sensors, control valves, power, control and network wiring | 15.00 | 15.00 |
| Total category A fit out cost | 137.00 | 144.00 |
| Total, in terms of gifa | £182.25/m2 | £169/m2 |
| The following exclusions apply to the costs shown in the table; inflation beyond second quarter 2001; general builders work, main contractor’s preliminaries, attendances, overheads and profit; professional fees and prescribed fees; contingency and design reserves; tax allowances; vat | ||