ENERGY
ORKNEY HOUSING ASSOCIATION – A Haven for Heat Pumps
Orkney Housing Association (OHAL) has installed NIBE Exhaust Air Heat Pumps across 264 of its affordable homes, designed to provide its residents with comfortable, energy-efficient living environments matched with significantly reduced energy bills and carbon emissions.
T
he homes incorporate a whole host of sustainability features, from timber cladding exteriors to structural insulated panels (SIPs), which deliver superior levels of insulation, prevent draughts and reduce heating costs. The introduction of NIBE Exhaust Air Heat Pumps to the housing stock was particularly important, helping meet building regulations, whilst providing an environmentally friendly, cost- effective heating and hot water solution for occupants.
Comments OHAL Technical Services Manager Richard Flett: “We opted for NIBE Exhaust Air Heat Pumps for our homes, as they cut electricity consumption by as much as 50 percent compared to traditional electric boilers. What’s more,
because of the buildings’ airtight insulation, they provide necessary ventilation so people can avoid issues such as damp or mould, whilst enjoying an improved air quality in their homes.” The unique Exhaust Air Heat Pump system from NIBE recovers warm stale air from inside the property in ‘wet rooms,’ such as kitchens and bathrooms, and feeds this back to the heat pump through a ducting system. The energy from this air is then reused to heat the property and hot water. Once the heat pump has extracted the energy it needs from the recovered warm stale air, the used cold air is released outside and fresh air is drawn back into the building via a system of external wall vents. The vents deliver the required air changes to provide the
Baxi space and water heating for Bryn Alyn School
B
axi Commercial Division has supplied a pre-fabricated packaged boiler plant, solar thermal hot water system and a wall-hung direct fired continuous flow water heater for the new two-storey Science and IT block at Bryn Alyn School in Wrexham, Wales. Designed to minimise environmental impact, the new building employs a number of sustainable technologies and has a BREEAM rating of ‘Excellent’.
The heating equipment was installed in the boiler room and provides space and water heating for the new building. Space heating, via underfloor and perimeter systems, is provided by a Sirius MB packaged boiler plant, with two Sirius 110kW wall-hung boilers. Baxi’s Potterton Commercial Sirius MB package is a complete heating system, including boilers, pumps, pressurisation system and heating controls. Factory built and tested, with only on-site assembly of the modules and connection to services required, the package enabled fast installation. This is a well-proven packaged solution with freely
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available design assistance and ‘plug and play’ capability simplifying site works for the contractor. Modules may be connected in a number of configurations, making them suitable for most boiler rooms – even those with restricted access and problematic layouts. Each compact module can fit through a standard doorway, simplifying transportation, manual handling and installation. With the advantages of off-site construction and availability of a 5-year warranty, these units offer both clients and installers the ultimate in fast, efficient installation. Benefits of this approach include reduction in the potential for onsite security issues, minimum disruption and reduction in system downtime.
Also installed in the boiler room are an Andrews Water Heaters SOLARflo cylinder and associated equipment which are connected to the system’s solar panels mounted on the building’s flat roof. Domestic hot water is preheated by the solar collectors and the heat transferred to a non-corrosive, stainless steel, unvented
PUBLIC SECTOR SUSTAINABILITY • VOLUME 2 ISSUE 6
property with sufficient ventilation – a particular must with well- insulated homes. Mr & Mrs Young were among the first tenants of OHAL’s sustainable housing stock, and live in a two-bedroom mid-terrace bungalow close to the seafront in Stromness on the mainland: “In our previous house, we used to get our heating and hot water from a combination of electricity and oil, which cost us hundreds and hundreds of pounds a year,” says Mrs Young. “Now we’re using around £3 a day of electricity and that includes everything from heating and hot water to all the electrical appliances we use – we’re delighted!” Occupying a three-bedroom mid- terrace house in Kirkwall, Mrs Sinclair adds: “Our NIBE heat pump provides all our heating, hot water and ventilation. It works perfectly with our underfloor heating system, the controls are really easy to use and our home is always comfortably warm.”
www.nibe.co.uk
cylinder. This, in turn, supplies a FASTflo wall-hung, balanced flue, continuous flow water heater which measures the incoming water flow and temperature, then modulates the burner up or down to meet the desired hot water demand, with plus or minus one degree accuracy and no stand-by heat losses.
www.baxicommercial.co.uk
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