Classvent
High levels of CO2 in any classroom impair children’s learning ability, so Natural Ventilation systems are an option. This is providing that they are designed to keep within the specified maximum classroom noise levels whilst keeping the CO2 levels below the stipulated 1,500ppm. Noisy inner city areas create particularly challenging environments for schools.
Classvent maintains comfortable ambient temperature and low levels of CO2 with variable control of both air volume and heating.
HOW IT WORKS
Classvent takes heat recovered from the exhaust air and uses it to heat the fresh air intake, to reduce the LPHW heating load.
The system also responds quickly to occupancy changes. When the room is unoccupied, the system immediately reverts to energy-saving, temperature set back mode with full recirculation of air flow. When the room is occupied, the system provides uniform distribution of temperature and fresh air.
Classvent provides an energy efficient solution to providing a good environment for teaching and learning.
EQUIPMENT
Constructed using 50mm double-skinned acoustically insulated panels.
Complete with:
- Filters
- Fresh air/recirculation dampers
- Plate heat exchanger
- LPHW heating coil
- Variable speed supply and extract fan
- Water pipework
- 3-port valve
- Control panel
- CO2 sensors
- Damper actuators
- Internal wiring
OPERATION
Heating
The unit starts up in full recirculation mode and with the valve to the heating coil fully open to preheat the classroom. On occupancy, the system reverts to 100% fresh and exhaust air with room temperature control via the 3-port valve.
CO2 control
The fan speed is controlled to regulate CO2 to below the stipulated 1,500ppm level. In low occupancy, when the concentration is below 900ppm the fan speed slows to save energy.
Free cooling of ambient air
Even in winter high occupancy gains can generate a need for cooling, so the unit will automatically control the room air temperature and lower the supply air, off-coil temperature. A supply-air temperature limit of 16 degrees C is set to prevent cold draughts.
Ventilation Boost Mode
When there is a demand for cooling and no cooling is available from the outside air, the supply fan shuts down and the extract run in Boost Mode to increase the air change rate within the room.
Boost Mode is activated on a predetermined, return air set-point temperature or a manual teacher-operated push button.
Night ambient air cooling
Heat stored in the fabric of the building during the daytime can be removed simply by operating the unit using the lower-temperature night air.
MOUNTING OPTIONS
- Within the ceiling void (550mm ceiling depth required)
- Floor-standing vertical unit
- Through the wall vertical unit (reduced footprint)
BENEFITS
- Low noise level due to integrated IAC inlet and outlet attenuators
- Energy-saving heat recovery
- BMS compatible
- Quick response to timetable occupancy changes
- Uniform air distribution
- Increased ventilation rates in summer
- Unoccupied, reduced-temperature set point
- Recirculation air on start-up
- Energy-saving, variable-speed fans
- Energy-saving, fast start-up just prior to occupancy. No need for pre-heat time compensation.
Case History
Education
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