Elta Fans announced product launches at Ecobuild
MODE RECOVERY
Several manufacturers highlighted their latest ventilation technologies at this year’s Ecobuild event. Andy Pearson selects some examples, beginning with a focus on mechanical ventilation with heat recovery
T 48 CIBSE Journal May 2012
he transition towards airtight, energy efficient homes in the UK means that purpose-provided ventilation to help eliminate condensation and pollutants
is now more necessary than ever. Mechanical ventilation with heat recovery (MVHR), in particular, has started to gain a significant foothold in new housing developments. In 2010-11, more than 18,000 MVHR units were sold, with growth predicted to continue, according to the Zero Carbon Hub Ventilation and Indoor Air Quality Task Group interim report. This statistic may explain why there were so many MVHR systems featured at this year’s Ecobuild show. MVHR units generally comprise a small
box, usually hidden in a cupboard or in the loft, which contains two electric-powered fans, one to supply air and one to remove air from the home. Warm moist air is extracted
from kitchens and bathrooms and ducted back to the unit, while fresh outside air is ducted from the unit to other habitable rooms. The inclusion of a heat recovery unit to transfer energy between the supply and extract ducts can help reduce the heating load.
One of a new generation of MVHR units
is Xpelair’s Carbonlite Xcell 150QV, which was showcased at Ecobuild. These units have been developed for airtight two-bed apartments or smaller houses. Two models are available: a two speed unit, the QV, and a three speed unit with winter defrost, the QVW. The QV unit is controlled by a two speed day/boost controller and the QVW unit is controlled by a combination of controllers and sensors. Both Xpelair units are manufactured with
an insulated, lightweight structural foam body, complete with four 125 mm top entry spigot connections. The range features a heat exchanger, which claims to be 90% energy efficient, low-energy multi-speed motors and long-life filters. Xpelair claims the units can save up to 278 kg of carbon per year compared to a traditional air conditioning
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