A comprehensive and imaginative refurbishment programme has recently been completed by managing agents, LaSalle Investment Management on behalf of owners, Coal Pension Properties Ltd, to No 25 Victoria Street, London SW1. Property Consultants were Drivers Jonas. The ‘revitalised’ building, which includes over 47,000 ft² of grade ‘A’ office accommodation, has a good BREEAM rating and offers top of the range Daikin VRV heat recovery air conditioning as well as high quality finishes, new raised floors, suspended ceilings and reception area etc.
The complex comprises 8 open plan office plus 2 basement floors, which house services plant, storage rooms and car parking. A total of 15 VRV systems were installed by specialist air conditioning company RS Air Conditioning and Refrigeration Ltd, Cambridge, on behalf of mechanical and electrical services contractors, EMCOR Engineering Services Ltd, Hatfield, Herts.
The VRV systems have capacities from 40 to 101kW (cooling) and 45 to 113kW (heating) and supply both open plan and reception areas with conditioned air via 218 Daikin FXSQ ceiling concealed indoor fan coil units connected by low pressure ductwork to a combination of linear perimeter grille and multi cone ceiling diffusers. Each fan coil unit is able to operate independently, controlling local room temperature by means of a return air sensor located in the ceiling void. Fan coil unit installation layouts are configured such that each floor with the exception of the ground can be divided into 2 separate self contained tenant wings. All VRV outdoor condensing units are mounted on the roof of the building.
Fresh air for the fan coil units, tempered to 160 C (where necessary), is supplied from air handling plant fitted with run around cooling coils and heater batteries. Each floor is supplied at the rate of12lit/sec/person based on an occupancy level of 1 person/10m2 plus an allowance of 25% to cater for increased future tenant demand.
Internal temperature conditions are:
Summer 230 C +/- 2 deg C db
Winter 200 C +/- 2 deg C db
at an external ambient of:
Summer (max) 300 Cdb, 200 Cdb
Winter (min) -40 C, 100% RH
Five Daikin I-controllers, each allocated to the control of 3 floors, are linked to wall mounted remote room temperature controllers throughout the conditioned areas, the overall VRV installation being monitored and controlled by a Daikin I-manager located in the BMS office in the basement.
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