Nibe Exhaust Air Heat Pumps Help Meet New Ecotargets

Windmill View in 11 li ng worth. West Yorkshire is a development of 82 two, three and four bedroom properties completed by Bramall Construction in partnership with Synergy, Pennine Housing 2000 and the Housing Corporation. Two of those properties are rather special - indeed a landmark in the quest for energy saving - for they are the first houses in the country to be designed and built to the Sustainable Code Level 4 recently established by the Government as a eco-target for new homes.

The stringent requirements of Level 4 have been met by utilising a number of different systems including solar panels, 300mm fully filled cavity walls, and improved U values on glazing, doors and loft space. The piece de resistance, however, is the installation of NIBE Heat Pumps designed to convert air that would otherwise be expelled in the normal ventilation process into energy for domestic hot water and central heating.

The NIBE Fighter 360P units take air at ceiling level that has been warmed by the heating system, appliances within the home and residents' body heat, extracts the energy via a heat exchanger located in the heat pump circuit and expels it into the outside atmosphere at very close to zero degrees

Centigrade. The recovered heat is passed by way of an indirect heating surface to a hot water tank, double-jacketed so that domestic hot water and radiators can be heated at the same time.

If the system sounds complicated, the result is not. Ventilation is a necessity for both health and comfort but by definition it normally released a great deal of carefully generated heat. Using an exhaust air heat pump virtually all that heat is recovered and reused.

The householder saves money on fuel bills and the environment benefits through energy saving and sharply reduced carbon emissions. In the two houses in Windmill View the heat pumps are used in parallel with solar generated heat and, linked with superior insulation methods, they promise to provide an exceedingly effective, energy efficient heating system.

Constantly rising energy prices and increasingly stringent statutory requirements are sharpening the awareness of building contractors, specifiers, building owners and building occupants about the energy efficiency of buildings. The European Commission's EU Action Plan states the greatest potential savings (27 - 30°/o by the year 2020) are in existing buildings. Numerous factors contribute to energy efficiency, including:

• Thermal insulation

• Production of heating and cooling energy appropriate to needs

• Efficient use of "free" heating [solar and ground source, for example) and cooling (such as ventilation and nighttime cooling)

• Efficient energy distribution through the building with minimum loss

• Using regenerative energies and attaining the highest possible efficiency in use of fossil fuels

• Optimal adjustment of existent heating, ventilating and air conditioning (HVAC) Installations

• Reducing the electricity consumed by HVAC system components [pumps, fans etc.)

Control technology is essential, directly or indirectly, in meeting all these aims. The goal is to achieve optimum comfort from minimum energy. Obviously, building users can use a Building Management System (BMS) with a user interface such as ARENA from Centra Line (from Honeywell) to prepare daily and weekly schedules of rooms and building areas in use, to avoid energy wastage. But the BMS can do much more to address the other factors listed above.

Potential savings can be assessed by Data on consumption and other parameters can be collected and analysed to make decisions based on facts. Assessors can be locally or remotely based. The BMS can evaluate the data itself, or it can be analysed by a specialized energy management system. Optimization, if considered worthwhile, can be directly implemented in the BMS. The results of these actions can by checked by the BMS, which can collect and analyze data and compare it with previous values. Building managers should always consider allowing remote access to the BMS by a service contractor, such as a CentraLine Partner.

Central building management by specialized service partners enables constant remote optimization of a building systems and energy requirements. The potential savings are enormous.

Data can be viewed and analyzed from different sites, for comparison. A BMS such as ARENA not only allows remote data acquisition, but also access to the control of every plant component, from boilers to room controllers, provided corresponding authorization is given. Partners can adapt program settings or control parameters to changing circumstances while the system is in operation, without visiting the site. The Partner will also identify problems with the HVAC system, then take immediate remedial action (remotely or by visiting the site) so they are usually solved before building occupiers become aware of a problem.

▲ ENQUIRY CARD/ONLINE NO 21 www.ebpr.co.uk/card

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