Design Solution · HVAC & Energy
Design Solution · Dream about it
Window-integrated NVHR unit tempers fresh air at low energy.
A simple unit of fans and dampers delivers tempered fresh air (8 l/s/person to classrooms) through a special window-integrated louvre that discharges exhaust upward and draws fresh air from below to avoid short-circuiting. It gives compliant ventilation and supply temperatures with far less energy than full mechanical systems.
A window-integrated unit combining fans, dampers and a heat-exchange element delivers tempered fresh air into classrooms at the claimed rate of 8 l/s per person, discharging exhaust upward through a dedicated louvre and drawing supply from below to prevent short-circuiting. The energy argument versus full mechanical ventilation is credible — eliminating or substantially reducing central ductwork and AHU fan power is a significant operational saving in an education building — and the integration with the window rather than the ceiling simplifies the services coordination in a refurbishment or new build with limited void. No provided evidence is on record and the delivery temperature and compliance claims are asserted, not demonstrated. What a specifier needs to establish before committing is acoustic performance — window-integrated units are in proximity to the occupied space and the fan noise must be within classroom acoustic criteria — and whether the control strategy, including night purge and frost protection, works for the building's specific occupancy pattern and orientation, since the passive driving forces (wind, stack) vary significantly with building form.
#NVHR #natural ventilation #heat recovery