Oventrop helps to prevent legionella in new hospital

Published:  05 November, 2008

Oventrop valves are used extensively in this new hospital to help prevent legionella.

Selected for their ability to pasteurise hot-water systems and control legionella risks, Oventop Aquastrom T Plus valves have been specified by MLM Consulting Engineers for the DHW system of the new Newton Abbot Hospital, due to open at the beginning of next year.

Facilities at the hospital include a maternity suite, minor-injury unit, stroke rehabilitation services and outpatient amenities for a wide range of disciplines. The hospital replaces a 120-year-old building.

In addition to the 13 Aquastrom T Plus valves, Oventrop has supplied all mechanical services valves for LPHW systems and gas.

LPHW serves 300 radiant panels, underfloor heating and air-handling units. Each radiant panel has an Oventrop AV6 TRV/Combi 4 lockshield set and remote controls. Half of them have 10 m capillaries and user-friendly dials for temperature setting. The rest are remote sensors that are only accessible for service purposes.

The factory-preset Aquastrom valves operates as a temperature-control valve on the DHW return. Once the system is up to temperature, the valve throttles down to a residual minimum flow to limit heat loss and reduce the energy and cost required to raise the return water back up to flow temperatures. As soon as the hot water in the return pipe cools to the preset temperature, usually 57°C, the valves allows more flow to eliminate dead legs and the risk of legionella bacteria growing.

The valve also provides a hydronic balance of the DHW system and enables automatic system pasteurisation by raising the HWS generator or stored-water temperature above 70°C.

For more information on this story, click here: Nov08, 131

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