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HVAC Pumping up low carbon performance

ENER-G Sustainable Technologies has helped to install a Vaillant geoTHERM ground source heat pump system at Vaillant Group’s new Northern Region headquarters. The Vaillant ground source heat pump system supplies the majority of the building’s heating needs, contributing to its outstanding sustainability performance.

The 30kW pump system draws energy from the ground using 11 70m boreholes, drilled by ENER-G. By exploiting the relatively stable temperatures found under the earth’s surface, the ground source heat pump is able to deliver highly efficient heating and cooling.

As a renowned champion of energy efficient heating products, Vaillant Group created a cost neutral and low carbon building, which incorporated the group’s portfolio of renewable energy products, including a ground

source heat pump, air-to-water heat pumps, air-to- air heat pumps, mechanical ventilation and heat recovery, solar thermal and photovoltaic systems.

The £3.5million redevelopment is believed to be unique in Europe for its incorporation of many different sources of renewable energy, which are used to power the heating and hot water in the building. A particularly innovative feature of the building is the use of heat from the Ground Source Heat pump -and other sources from the building, which is distributed throughout the building through mechanical

ventilation and heat recovery. In addition, the building is light switch- free as all areas are controlled by motion sensors.

Cool-therm contract for Colt

Colt’s data centre in Wapping, London, has been equipped with ultra efficient Turbomiser chillers as part of an upgrade, delivering a total of 3.3MW of high efficiency cooling. The facility will be cooled by six of the Turbomiser machines, each rated at 550kW.

The contract was won by Bristol- based specialist Cool-Therm Ltd against stiff competition, following successful performance tests at Colt’s Powergate data centre. Monitoring by the client showed that energy consumption fell by 55%

following the replacement of existing chillers with Turbomisers.

In addition to more than halving energy costs, Colt said it has benefited from significant reductions in service and maintenance costs.

Following the installation of the Turbomisers, the site’s power usage effectiveness (PUE) has been reduced by 24%. Over the lifespan of the equipment, it is estimated that Colt will have helped to reduce UK carbon emissions by at least 20,000 tons of CO2.

Rob Young, who led the project for Cool-Therm, said: “Taking into account ambient fluctuations, this equates to an annual saving of well over £100,000 a year. This is with fan speed limited to 60% of capacity due to site noise restrictions. If the fans were allowed to run faster using the new adaptive fan speed control, the savings would be even greater.”

Based on oil-less Turbocor compressors which use virtually friction-free magnetic bearings, Turbomiser can achieve Energy Efficiency Ratios (EERs) of 10 and above without the need for additional free-cooling circuits with expensive glycol, saving both on initial cost and ongoing pump energy.


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