ºÃÉ«ÏÈÉúTV

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Table 1: Relative efficiency of chiller installations relative efficiency (CoP)
ºÃÉ«ÏÈÉúTV size (m²) 30007700 11500
Chiller size (kW) 400 1000 1500
Air-cooled screw2.2–4.0 2.2–4.0 2.2–4.0
Water-cooled scroll 3.5 3.5 3.5
Water-cooled screw 4–5, 5-6 part load 4–5, 5–6 part load 4–5, 5–6 part load
Water-cooled centrifugal:ÌýÌýÌý
Single compressor6–7, 8–9 part load6–7, 8–9 part load6–7, 8–9 part load
Dual compressor 6–7, 10–11 part load6–7, 10–11 part load6–7, 10–11 part load
Table 2: Indicative costs of alternative chiller installations capital cost (£)
ºÃÉ«ÏÈÉúTV size (m²) 3000 7700 11,500 30,000
Chiller size (kW) 400 1000 1500 3900
Air-cooled screw56,000 120,000 160,000 468,000
Water-cooled centrifugal ÌýÌýÌýÌý
Chiller n/a 93,000 117,000 255,000
Condensing system n/a 94,000 121,000 225,000
Total (£) n/a 187,000 238,000 480,000
Water-cooled screw ÌýÌýÌýÌý
Chiller 50,000 88,000 119,000 270,000
Condensing system 46,000 94,000 121,000 225,000
Total (£) 96,000 182,000 240,000 495,000
Costs are current in first quarter 2006 and based on a central London office development.The rates are for the supply and installation of the chiller plant and include allowances for builders’ work. Allowances for trade discounts, preliminaries and testing and commissioning are excluded. No allowance is made for professional fees or VAT. Operating costs are not included.