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Air conditioning & ventilation
Design qualities
the door to energy wastage from fan operation and air conditioning for both heating and cooling modes. This is where demand-controlled ventilation
(DCV) could have a signifi cant part to play across school building stock. With MVHR (Mechanical Ventilation with Heat Recovery) solutions such as Elta Fans’ PREMA range, the amount of airfl ow can instead be managed to suit occupancy levels. Through this approach, a building can be ventilated cost-eff ectively without losing sight of good indoor air quality. In MVHR systems, closed loop speed control for
both EC and AC motor options means the fan power is proportional to the speed cubed – resulting in greater energy effi ciency. Ambient conditions in the space are continuously monitored and measured by CO2 or temperature sensors to input live feedback to the zone controller. This information relay allows fan speed to be adjusted in order for the ventilation rate to be modulated in line with the specifi c use and occupancy of a building. By ensuring the ventilation rate continuously matches current occupancy rate and varying ambient conditions, eff ective DCV leads to considerable energy savings.
It must be acknowledged that design properties are important to consider during the decision process for ventilation solutions. Through these deliberations, further long-term energy gains and cost savings can be achieved. For example, a free running, backward curved
impeller and special three-dimensional blade geometry are implemented in PREMA’s units. Such facets of design reduce rotational tone within the system for higher performance and subsequently give greater energy savings. Thermal energy recuperation is another design element to keep in mind. Here, the units enhance thermal energy exchange through the large surface area of the heat exchanger to ensure as much as 92% of thermal energy is recovered.
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