30 air conditioning & ventilation
becoming increasingly specified for upmarket developments. They can also be used with smart home automation systems as part of a completely integrated living environment. With whole house heat recovery, stale air is
extracted from wet rooms – even through cooker hoods in kitchens - and passed across a heat exchanger to remove the heat and the residue is exhausted to atmosphere. Fresh, filtered air is drawn across the heat exchanger to be
warmed by the retained heat. This warmed air is then distributed back into the property. The streams are kept separate to avoid any cross con- tamination and the result is a cleaner and healthier living environment. MVHR may be the optimum approach in
terms of sophistication and energy efficiency, but extract systems alone still provide a viable approach. Central extract systems may be the next level down in terms of efficiency, but the better specified systems will nevertheless incor- porate highly energy efficient EC fans. These systems also extract stale air from “wet” rooms and exhaust it to the outside atmosphere with fresh air replenishment through trickle vents. Different sizes of systems are available for large dwellings, smaller houses and apartments. They can be conveniently located out of the way in a roof space or cupboard with ducts fed into the individual rooms as required. With both these types of ventilation system,
an often overlooked fact is that close con- trol of their operation is absolutely essential for optimum performance. Heat recovery and central extract systems can be specified with a balancing panel that is set by the installer during commissioning and provides infinitely variable control – not just stepped control – of fan speeds. This results in exactly the required amount of air being extracted. Over or under ventilated properties are simply not energy effi- cient. Once the balancing panel is set, additional wall mounted controls for the occupiers can also be specified.
respond online at
www.hbdonline.co.uk
Positive pressure ventilation systems are also
available as whole house systems for wall or roof mounting. They introduce a constant flow of fil- tered, tempered air into the home with the system creating positive pressure that forces stale air to escape through the fabric of the building.
“The choice of ventilation strategies is very wide but today’s housebuilders are in position to provide solutions that take all legislative, environmental, budgetary and lifestyle considerations into account”
An overlooked fact about open flued heating
appliances is that they encourage ventilation of a property. The air required for the combus- tion process is drawn in from the occupied space and the moisture laden gases vent to the atmos- phere. Not only that, but today’s warm air heating systems also frequently offer optional electronic air filtration that can remove airborne particulate down to one micron circulating around the house. The choice of ventilation strategies is very
wide but today’s housebuilders are in position to provide solutions that take all legislative, environ- mental, budgetary and lifestyle considerations into account. Discussing requirements at an early stage with the many organisations and consult- ants with long standing expertise in this field is the way forward.
Enq. 117
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