68 HEATING, VENTILATION & SERVICES


DECENTRALISED VENTILATION SYSTEMS ARE A FLEXIBLE SOLUTION IN WHICH COMPACT INDIVIDUAL DEVICES ARE INSERTED INTO THE OUTER WALL, WHICH WHEN CONFIGURED IN PAIRS GUIDE THE AIRFLOW THROUGH THE LIVING SPACE


damp and stale air to prevent condensa- tion and mould.


These units run continuously and automatically switch between air etract and supply in approimately  minute intervals. hen running in etract warmed stale air from the room is etracted and heat is collected in the heat echanger. The cycle then changes and the unit switches to air supply drawing in fresh air from outside and transferring the captured heat to the incoming clean air supply to raise the fresh air temperature before entering the room.


Using heat recovery units as opposed to conventional fans therefore reduces heat losses signifi cantly with some units able to recover as much as 90% of the heat. ingle-room ventilation units also provide a constant supply of fresh air to help maintain a healthy home environment.


INSTALLER BENEFITS


Decentralised ventilation systems are a fl eible solution in which compact individual devices are inserted into the outer wall which when confi gured


in pairs guide the airfl ow through the living space. By installing units on a room-by-room basis the designer can create a highly effi cient decentralised whole-house  system with airfl ow rates tailored much more precisely to suit the occupant’s needs.


In addition as each unit is self-con- tained, there is no need to specify a loft-mounted centrally managed ventila- tion device – and the associated costly and time-consuming ducting  presenting a further benefi t both for renovation wor and new build projects. Once the wall opening is prepared, the installation of each ventilation unit is completed in less than one hour.


END USER BENEFITS


In a world of rising fuel and energy costs, the focus on energy conservation has never been greater. A study carried out by the open university in 2018 concluded that 30% of the heat lost in our homes is through conventional ventilation. To put that into contet p in every pound we spend on heating is being wasted.


Decentralised units have an integrated heat recovery unit manufactured from ceramic to limit moisture build-up and to provide heat recovery effi ciency of up to 90%, thereby dramatically reducing these heat losses to as low as just 3p per pound. Heat recovery ventilators can also be very economical to run, with the most energy effi cient units consuming less than 4 Watts of electricity on the maimum setting and costing around  to run continuously for 365 days (based on typical energy costs as of June 22). urthermore unlie centralised systems, maintenance contracts are not necessary with decentralised ventilation; any cleaning reuirements can simply be carried out by the homeowner. ith so many cost and effi ciency


benefi ts for installers and end users alie it is sensible for developers to consider decentralised HRV systems as a credible alternative to both centralised systems and tricle vents.


Richard Poole is head of ventilation sales at Siegenia


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