Current Energy Recovery Ventilator (ERV) exchangers are limited in their energy recovery efficiency by the exchanger design and the water vapour permeability of membrane materials. This presents a need for exchangers with higher total energy recovery. In North America, cross-flow ERV cores are typical, but their transfer mechanism limits the heat transfer rate relative to flow rate. To obtain higher sensible heat transfer, which is important for reducing heating loads in the winter, a counter-flow core is a more efficient design.
Furthermore, current ventilation and energy recovery systems lack the ability to operate optimally from an energy efficiency standpoint while ensuring adequate indoor air quality (IAQ). Ventilation control strategies should be based on inputs such as indoor and outdoor climate conditions, IAQ, the cost of electricity, and the comfort of the building occupant. To evaluate ventilation control strategies which minimize energy utilization while maintaining acceptable levels of comfort and air quality within buildings, an integrated approach is required.
The energy recovery exchanger (core), the energy recovery ventilator system, the heating, ventilation and air conditioning system (HVAC) controller, and the building HVAC system should all function optimally together. Recognizing the need to improve energy consumption and indoor air quality in buildings using an integrated approach, dPoint Technologies proposed the project “Integrated Approach to Development of a High Efficiency Energy Recovery and Intelligent Ventilation System” for ecoEII funding. The project was awarded $704K.
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