AIRCON, AIR MOVEMENT & VENTILATION 2 ECOBUILD REVIEW
heat recovery system and can achieve a Specifi c Fan Power as low as 0.66 W/l/s. Xpelair was also promoting the Xcell 300
MVHR range of units for larger, three to fi ve bedroom houses. The QV model features a manual two-speed controller, the QVW model features a three-speed controller, winter defrost cycle, fi lter inspection and motor failure indicators and the facility for automatic control of the unit through a combination of humidstats, CO2 or smoke sensors. Steve Mongan, head of marketing at Xpelair, says the unit can save ‘up to 480 kg of carbon dioxide each year compared to a traditional AC heat recovery system’. Ventilation product manufacturer Titon
used Ecobuild to promote its range of six whole-house ventilation units with heat recovery. All but the smallest of the units feature a summer boost option (with an override timer to prevent the units being accidently left in boost mode) to help reduce overheating in dwellings. Other extras include a 100% summer bypass and an option to automatically turn off – or reduce – the air supply when windows or trickle vents are opened. Each model can be fi tted with either 125 mm or 150 mm round ducts, without the need for adaptors. The HRV1 Q Plus is the smallest unit, which has been developed for use in dwellings with three wet rooms or fewer. The largest unit is the HRV3 Q Plus, which has been designed for larger properties with three to seven wet rooms.
Total Home Environment’s range of
MVHR units was one of the more innovative products at the show. These MVHR units are unusual in that they incorporate a mini air-source heat pump in addition to a conventional counter-fl ow heat exchanger. This enables the units to deliver fresh, fi ltered air while reducing the total heating load of a property. The combination of passive and active heat recovery is claimed to make the units up to 250% effi cient, which the manufacturer says can completely negate the need to heat ventilation air, saving approximately 50% of the total heating load of a home. There are also Combi versions of the unit using the same technology to produce up to 380 litres of hot water per day,
which is stored within an integral 185 litre tank.
Alongside these whole-house solutions
was Johnson & Starley’s Q-Vent HRC 8x3 continuous mechanical extract ventilation solution for en-suite bathrooms. A heat exchanger recovers energy from the stale contaminated air drawn from the bathroom and uses it to temper the incoming fresh air supplied to the bedroom. The extracted air is then discharged to the outside via a single duct and grille. The unit will increase the rate of ventilation when the bathroom is being used for periods in excess of two minutes by switching to boost mode. For larger commercial ventilation applications for schools, offi ces, retail and leisure outlets, Airfl ow’s DV3600 Duplexvent Flexi Heat Recovery unit has an extract rate of up to 3,600 cu m/hr. It features a counter fl ow heat exchanger, which claims to be more than 90% effi cient in its operation. The unit is also building management system (BMS) compatible and incorporates a motorised winter/summer bypass to isolate the heat recovery function during the hotter months. Designers looking for a reliable contractor
Monodraught has launched a ‘performance component’ for its Windcatcher system
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to fi t an MVHR system should check out the BEAMA scheme. The association, which was speaking at the renewable heat focus area of the show, has launched an MVHR approved contractor scheme targeted at specifi ers and installers. The scheme explains how to design, install and commission a domestic ventilation system. Once the course has been passed, an operative can sign up to an approved contractor scheme. Under the scheme, the approved contractor is responsible for completing a checklist to ensure an installation meets the performance laid out in the original design. Once the installation is signed-off, the
May 2012 CIBSE Journal 49
A previous generation of one of Xpelair’s MVHR units
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