Products

Heat Recovery

Overview

• 10 standard sizes
• airflow up to 4.3 m3/sec
• double skinned construction
• side access as standard; bottom access, stacked arrangement and external options possible
• high density infill for low breakout levels
• 20mm Mez frames to all spigots
• fitted hangers for drop-rod installation (channel base on models 650, 800, 950 & 1100)
• filter access panels fitted with quick release fasteners
• backward curved impellor direct driven by low energy EC motor
• fan blades statically and dynamically balanced in accordance with ISO 1940/1 and balancing quality G6.3
• single phase 230V fan motors are pre-wired to speed controllers and isolator
• high efficiency counter-flow heat exchanger typically >80%
• face and by-pass damper with fitted open/close motor
• electric heater battery or LPHW heating coil
• selection of fitted controls available
• panel filters to G4 grade, mounted in slide-in channels
• supply panel filters to F7 grade
• extract panel filters to M5 grade
• maximum air temperature 40ºC
• manufactured in UK to ISO 9001
energy efficient, environmentally friendly, economical EC motors

Consider the example;
• Supply air volume 0.1m3/s @ 125Pa
• Supply air volume 0.1m3/s @ 125Pa
• SFP<1.4W/l/s
• LPHW heating coil
• 50mm airway supply attenuator
Would result in;
• Additional 17Pa supply pressure for LPHW coil
• Additional 11Pa supply pressure for attenuator • Additional 11Pa supply pressure for attenuator • Additional 11Pa supply pressure for attenuator
• Exact heat exchanger efficiencies will have to be checked with the Sales Office
• Supply side
o 153Pa pressure
o SFP < 0.7W/l/s
o Fan speed < 8V ~ 80%
• Extract side
o SFP < 0.7W/l/s
o Fan speed < 8V ~ 80%
For the uneven fan duty points the SFP for the unit has to be recalculated;
• Calculate the motor absorbed power for supply and extract fans
o SFP * Airflow = Absorbed Power
o Supply = 0.7 * 0.1 = 0.07kW
o Extract = 0.7 * 0.12 = 0.084kW
• Combine the motor absorbed powers to give total unit absorbed power
o 0.07kW + 0.084kW = 0.154kW
• Divide by the supply or extract airflow whichever is greater to give unit SFP
o 0.154kW / 0.12m3/s = 1.28W/l/s o 0.154kW / 0.12m3/s = 1.28W/l/s

AVT (SES) offers a full refurbishment, maintenance, repair and installation service. PHONE or EMAIL TO SEE WHAT WE CAN DO FOR YOU! Tel: 01264 356415: Email: ses@airventtechnology.co.uk.