Cooling and heating with air handling units in office buildings with Air Handling Unit (AHU)SAV’s AirMaster is a direct, zone-specific air handling unit that is ideal for use in classrooms, lecture theatres and other educational spaces.AirMaster units are installed in the space that is being ventilated, with short connections to the outside through a wall or roof, so that they respond directly to local ventilation requirements. Their key features include:By avoiding the constraints imposed by inflexible, centrally ducted AHU systems, AirMaster helps further by:AirMaster AHUs have been delivering effective, energy-efficient ventilation to classrooms in Northern Europe for many years, complying with the rigorous standards that are becoming the norm in the UK. SAV Systems has therefore teamed up with leading Danish ventilation specialist AirMaster AS to bring these innovative units to the UK education sector.As building tightness improves and there is less natural air leakage, there is growing concern about indoor air quality (IAQ), and the need to ventilate in the most energy efficient way possible.

There is also growing acceptance that Demand Controlled Ventilation is the most efficient way to address this issue.Natural ventilation as used in classrooms is often unable to respond to changing ventilation requirements caused by variable occupancy, other than by manually opening windows.Windows are likely to be opened in response to a rise in temperature, rather than to changes in air quality, (such as CO2 levels). Opening windows wastes heat during the colder months.As AirMaster units are mounted within the space they ventilate, they are ideally positioned to respond quickly to any changes in key IAQ parameters as detected by CO2 or relative humidity sensors. As a result, they are highly responsive to variable occupancy and other factors that may influence Indoor Air Quality.CO2 sensors can be wall-mounted or fitted integrally to the air handling units, providing a signal which is linked to fan speed. As CO2 level rises with occupancy, fan speed accelerates accordingly and thus maintains excellent Indoor Air Quality.AirMaster units are fitted with Class M5 filters as standard (as recommended in EN 13779) on both supply and extract airflows.

As well as maintaining Indoor Air Quality, these filters protect the heat exchanger from fouling, ensuring that heat exchange efficiency is maintained. Where external air quality is expected to be poor, AirMaster units can be supplied with filters up to Class F7.Furthermore, extending or re-configuring centralised ventilation systems is complex, expensive and disruptive to the building’s occupants.SOLUTION: AirMaster air handling units can be located just where they are needed and the system can easily be extended at a later stage by the addition of further units. On most models, ‘plug and play’ cooling units can be provided initially or retrospectively.SOLUTION: AirMaster mechanical ventilation with heat recovery (MVHR)units have been specifically engineered with low noise levels so that occupants are not disturbed. Typical noise levels at just 1m distance are only 35dB(A) at 100% power and 30dB(A) at 80% power. This complies with the recommended indoor ambient noise levels for classrooms and general teaching areas.

AirMaster AHUs can easily be installed during refurbishment programmes, one room at a time. my ac unit frozeThere is no requirement for additional ductwork to a centralised air handling unit. outside ac unit running hotGiven a flat surfaced ceiling, AirMaster MVHR units can supply air effectively using the Coanda effect, without further need for in-room distribution ducting.outside ac unit won't startStudies carried out by the University of Exeter have shown that CO2 levels exceeding 1,500 ppm can lead to a 5% reduction in Power of Attention measures. CO2 levels in naturally ventilated classrooms are often above 1,000 ppm and frequently exceed 2,000 ppm.Reducing CO2 levels by adequate ventilation improves the performance of students and reduces the risk of accidents in practical subjects.

Studies in Denmark have shown that an increase in fresh air rates from 5 l/s to 10 l/s per person results in a 29% improvement in cognitive performance.Field trials by the International Centre for Indoor Environment and Energy, found that deterioration in Indoo Air Quality – and increased CO2 concentrations in particular – have a more profoundly negative affect on cognitive performance than rising indoor temperature.AirMaster units are versatile and are available in a range of sizes, from ceiling mounted units for single offices to floor mounted units for larger spaces.Some examples of school projects where AirMaster ventilation has made a difference:SAV Systems provides a full design support service to ensure that each AirMaster unit provides maximum benefit in terms of performance, ease of installation and energy saving. Air Handlers and coils Installing the correct air handler and evaporator coil is essential for getting the highest level of comfort from your central air conditioning or heat pump system.

Make sure that your system is performing to its optimum level with our air handlers and evaporator coils. Factory-Installed Electronic Expansion ValveVariable-Speed ECM Blower MotorComfortNet™ Compatible Factory-Installed Thermostatic Expansion ValveVariable-Speed ECM Blower MotorComfortNet™ Compatible All-Aluminum Evaporator CoilThermal Expansion ValveComfortNet™ Compatible All-Aluminum Evaporator CoilTransformer and Blower Time-DelayFactory-mounted TXVs All-Aluminum Evaporator CoilTransformer and Blower Time-Delay ComfortNet™ CompatibleBuilt-in dehumidifying featureUsable as an Electric Furnace Usable as an Electric FurnaceMulti-Position Installation All-Aluminum Evaporator CoilSequence-controlled, rust-resistant nickel chromium heating elements All-Aluminum Evaporator CoilQuiet OperationAvailable with or without Heat Rust-Resistant, High-Temperature Thermoplastic Drain PanFactory-Mounted TXV Rust-Resistant, High-Temperature Thermoplastic Drain Pan