Hoval boilers fire up Arsenal Football Club

A total of 19 Hoval gas-fired condensing boilers have been installed at the Emirates Stadium of Arsenal Club to serve heating and hot-water systems. Key factors in the specification of the Ultragas AM-c 500 boilers by consulting engineers Buro Happold were their high efficiency and compact design, optimising the use of plant-room space. Included in the extensive facilities of the stadium are 150 executive boxes for corporate hospitality, both on match days and at other times. The heating and hot-water systems are designed to provide the flexibility to meet these variable occupancy patterns quickly and efficiently. Peter Naylor of Buro Happold explains, ‘The boilers are located in eight rooftop plant rooms and are energised 24 hours a day, using a primary loop that is always charged with hot water at the flow temperature of 80°C. Each boiler uses a common header with constant-volume and variable-temperature pumps and another set of constant-volume pumps serving a plate heat exchanger. ‘This arrangement, combined with the zoned control, provides a very responsive and efficient system. To optimise condensing, the return-water temperature is set to 50°C.’ Hoval also supplied condensate-collection reservoirs for each boiler, with built-in pumps to discharge condensate to the drains. The built-in controllers on the boilers are interfaced to a building-management system. The boilers have an output of 500 kW and can modulate down to 97 kW. Ultragas boilers achieve net efficiencies of up to 109.5%, NOx emissions of 20 mg/kWh and carbon monoxide of 10 mg/kWh are achieved. The boilers will be serviced by Hoval’s dedicated maintenance team, which is accredited under the Safe Contractor Scheme. Building services were designed by Buro Happold and installed by MJN Colston.

Related links:

• www.hoval.co.uk