Installation News Every little helps
A Dimplex ground source heat pump is being used to supply domestic hot water to the first supermarket built to PassivHaus standards in the UK and Ireland, a Tesco store in Tramore, County Waterford. PassivHaus buildings are designed to
be extremely energy efficient - usually this means the annual energy consumption is under 15kWh/sq m. The building fabric features high levels of air tightness and insulation to keep heat in, meaning only minimal space heating is required – and making the water heating an even more important consideration in the performance of the building. The building’s hot water is provided by a heat pump system jointly designed by Dimplex and Dynamic Energy Solutions and installed by County Kildare-based Geothermal Solar. The system takes an unusual approach to meeting the store’s requirements; it uses a Dimplex SI 11 MEH ground source heat pump to draw heat directly from the water used in the building’s cooling system, efficiently recycling the waste heat from the chiller cabinets on the shop floor. The heat pump easily meets the total hot water requirement for the store, including the staff canteen and washrooms, and the customer washrooms.
Fergal McEntee of Dynamic explains:
“We could have used a water source heat pump instead. However, a water source installation can be technically more complex, while the closed loop Dimplex ground source unit allows us great flexibility in the system design. Plus, we
wanted to take advantage of the higher flow temperature that this unit gives – it’s ideal for meeting the supermarket’s hot water requirements.”
The Dimplex high temperature ground
source heat pump can deliver flow temperatures of up to 70ºC. At Tramore, where typical intake temperatures from the cooling system are around 25 - 28ºC, the heat pump easily produces flow temperatures of 60 - 65ºC – and a CoP of around 4.0 is typical under these quite unique conditions. More fresh thinking was demonstrated in the delivery of the heat pump system. In an approach that ticks all the boxes for modern methods of construction, minimising time spent on site and associated costs, a complete plantroom containing the heat pump was pre- assembled in the UK and shipped to Ireland, to be attached to the side of the supermarket building. However, this method also presented the designers with an additional challenge to work around when it came to the sizing
The ultimate protection
A large kennels and cattery has installed the ultimate fire survival cable from AEI Cables to ensure performance of its fire alarm system. New buildings at the RSPCA Felledge
Animal Centre at Chester-le-Street, Durham, have been fitted with Mineral Insulated Cabling (MIC) because of its fire protection qualities in ensuring that the alarm system will continue to operate in the event of a fire. The cabling provides a networked fire
alarm system for the main animal centre reception, three kennels for overnight
10 Electrical Wholesaler July 2010
holding and for the long stay isolation kennels. RSPCA Manager Maggie Eden said:
“This is an important new centre for the RSPCA. Sadly, there is a real and significant problem in the North East with animals being abandoned and abused, so our objective in opening the Animal Centre was to contribute towards preventing cruelty and promoting kindness to animals. These new buildings really help us in our work.” Ossie Lawrence, Sales Manager for AEI Cables, said: “Mineral Insulated Cabling
offers the ultimate protection for buildings of this kind and it gives the emergency services time to effect a safe evacuation in the event of a real fire because the fire alarm will continue to operate and provide the information they need. In essence, this cable does not burn.” At Felledge all of the animals have been
rescued from abandonment, neglect and bad treatment by their previous owners. Most of them are found new homes by members of the public who also donate money to the RSPCA.
www.aeicables.co.uk
www.ewnews.co.uk
of the pipework, as it had to be able to accommodate all the adjustments to the system which may have been required to adjust performance once the heat pump was installed.
Fergal McEntee continues: “This application looks at the energy requirements for supermarkets and has opened the business community’s eyes to the possibilities for heat pumps, particularly with regard to using them to provide hot water. As a result of this installation, we are now talking to commercial clients in a wide variety of sectors.”
The supermarket incorporates a wide variety of other environmentally-friendly initiatives, including PV panels, a wind turbine, rainwater harvesting and infiltration permeable paving in the car park, the use of natural refrigerant gases in cooling systems, triple glazing throughout for insulation and roof-lights to allow use of natural daylight where possible.
www.dimplex.co.uk
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