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Mitsubishi Electric
Case Studies 1

WR2 helps Logistics Centre realise green ambitions

A pioneering British company has been showing just how sustainable buildings can be with its new International Logistics Centre in Southend.

Olympus KeyMed’s 3,400m² centre is unique for its type in the UK because it combines high finish levels with a sustainable approach that uses a combination of green systems for significantly better energy efficiency than an equivalent conventional facility.

At the heart of the eco-friendly, energy-efficient system is a vertical closed loop bore hole system (with 50 bore holes sinking 98m into the ground strata) linked to Mitsubishi Electric’s unique WR2 ground source heat pump which allows the building to use the geothermal energy of the earth as a heating or cooling energy store.

Ground source water systems are one of the recognised renewable energy sources listed as part of the Government’s push for 10% renewable energy usage, and Mitsubishi Electric’s WR2 and WY City Multi condensers are the only air conditioning products currently on the list.

The inverter-driven WR2 units use the geothermal energy from the earth to either cool or heat their refrigerant circuit, reducing the energy needed to keep the building at the right temperature. WR2 systems also transfer heat between any of the 24 indoor units available on each circuit to offer double heat recovery potential and COPs of up to 7.0.

In addition to the WR2 ground source heat pump system, the roof of the logistics centre is covered with solar panel water heating which will provide an average of up to 50% of the domestic hot water all year.

The low energy, highly insulated building also collects rain water from the roof for flushing the toilets and elsewhere.

By combining the most environmentally friendly systems suitable for this locality and looking at all aspects of the building’s services, Olympus KeyMed has created a building that will consume at least 30% less energy and 25% less water compared to that of an equivalent ‘traditional’ building, whilst delivering a high quality internal working environment for staff

Mitsubishi Electric gets fresh with its own Headquarters

Mitsubishi Electric has completely refurbished its Hatfield headquarters installing a range of
systems as a test bed for its advanced technology.

This includes the revolutionary ‘Mixed Mode’ system fitted in a ground floor, 500m² open-plan office. The unique system, developed in conjunction with industry expert, Passivent, combines the best of natural ventilation with totally flexible air conditioning to offer environmental control that uses fresh air as much as possible and switches on the air conditioning only when necessary.

Heat recovery air-conditioning provides up to 67kW cooling when the ambient temperature of the office rises above 21°C in addition to delivering up to 72kW of heating in the colder months of the year.

“The Passivent system gives us free cooling when ambient conditions allow and both the air conditioning and the natural ventilation are controlled by a Mitsubishi Electric PLC (programmable logic controller) that allows us to ensure that the whole system uses as little energy as possible,” explained Philip Ord, VRF product manager.

The new Part L2 of the Building Regulations demands cuts in the energy used by buildings at the same time as placing a requirement that buildings do not overheat, so the Mixed Mode system answers both of these criteria, by using natural ventilation as much as possible and switching to the air conditioning only when the Passivent system cannot cope alone.

The natural ventilation system took only a couple of days to install and uses the ceiling voids as a natural plenum to deliver air to grilles in the ceiling. On the outside of the building, six units of the glazing have been modified to incorporate the external Passivent vents.

These are opened and closed automatically according to carbon-dioxide concentration, indoor and outdoor temperatures, and rain and wind.

Overall energy consumption is reduced because fresh air is supplied to the indoor environment via the natural ventilation system without the need for mechanical power consumption and this provides the building with free cooling from outdoors when required. The overall effect for the occupant is a vastly improved air quality and comfort level, with minimum energy consumption.

Technical information associated with: Mitsubishi Electric - VRF Air Conditioning, City Multi Super Y R2 WR2 Series

 

Sustainable buildings air conditioning
Logistics Centre, Southend

WR2 ground source heat pump
Mitsubishi HQ

Heat recovery air-conditioning
Mitsubishi HQ

Air conditioning and natural ventilation

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Mitsubishi Electric Europe
Air Conditioning Systems Division
Travellers Lane
Hatfield
Herts
AL10 8XB

Tel (General) : 01707 282880
Tel (Sales) : 01707 282800
Fax : 01707 278674

 

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