Air handling units | Archive Titles

Table 1: Relative cost and efficiency of recuperator systems (based on 5 m³/s AHU)
Recuperator cost	Indicative cost (£)	Fan motor power supply/extract (kW)	Pump/motor power (kW)	Efficiency (%)
Run-around coil	14 000	7·5/6·3	2·1	46
Plate heat exchanger	17 900	7·6/6·0		50
Thermal wheel	18 000	7·0/8·9	0·15	71

Table 2: Comparative costs of air handling units
Type	Duty (m³/s)	Unit cost (£)	Run-around coil	Thermal wheel	Plate heat exchanger
Direct gas-fired	2	13 000	14 000	17 000	17 000
	5	28 600	31 000	36 000	36 000
	10	65 000	69 000	79 000	76 000
	15	91 000	98 000	104 000	105 000
lthw coil	2	11 500	13 000	15 000	16 000
(external)	5	25 300	28 000	32 000	32 000
	10	57 500	62 000	72 000	68 000
	15	80 500	87 000	93 000	94 000
LTHW coil	2	10 000	11 000	14 000	14 000
(internal)	5	22 000	25 000	28 000	28 000
	10	50 000	54 000	63 000	61 000
	15	70 000	76 000	82 000	93 000
Costs are based upon the fabrication and installation of air handling units for a commercial office building. They are current in December 1999, based on locations in Central London. The costs are based on air handling units containing the following components: supply fan, exhaust fan, heating and cooling coils, bag and panel filters and control panel.