Water-cooled VRV air conditioning helps new Manchester hotel meet Part L requirements
The key to the Daikin water-cooled VRV air-conditonign system in a new Manchester Hotel is a small condensing unit on each floor.
To help the 171 m-high Beetham Tower in Manchester meet the carbon-emissions requirements of Part L of the Building Regulations, a Daikin water-cooled VRV air-conditioning system has been installed to serve the hotel occupying floors 5 to 23 of this 43-storey building. Using a 4-pipe fan-coil system would have required a major redesign of the building. Air conditioning for this Hilton hotel with its 285 bedrooms, reception, restaurants, meeting rooms etc. is provided by 25 water-cooled heat-recovery VRV-WII condensing units serving 328 fan-coil units. Three more systems serve the landlord’s ground-floor reception for the apartment accommodation. Each bedroom floor is served by a heat-recovery condensing unit providing 27 kW of cooling and 32 kW of heat housed in a service cupboard and serving 15 fan-coil units in bulkheads above the bedroom doors. Condensing units for the public areas are in a podium plant room. Each condensing unit is connect by a 2-pipe water circuit to LPHW boiler plant and an air-cooled heat-rejection unit at roof level. During the heating cycle, the refrigerant circuits absorb heat from the water circuit via plate heat exchangers. When cooling is required, heat is rejected to the water circuit. The water circuit makes possible heat recovery between different floors, and the refrigerant circuits provide heat recovery within the floor they serve. These two modes of heat recovery make possible exceptional EERs. Simplified room controllers are interfaced through a LON gateway to the hotel’s Fidelio booking system. There are three operation modes. • Room free, with a wide band of control between 18 and 28°C. • Room booked, with a band width of 16 to 26°C. • Room occupied and operating at a room-controller set point of 22°C. The system qualified for Enhanced Capital Allowances and was installed by Booth Imperial of Bolton.
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