Heating, fresh air and heat recovery for schools from Dunham-Bush
The events of 2020 have focused even more attention on indoor air quality, and while some new technologies have emerged, the fundamental approach of bringing more fresh air into buildings is still the most effective way to improve indoor air quality.
As awareness of indoor air quality in classrooms and other buildings grows, both new and established products from Dunham-Bush are making a difference. The fast warm up and quick response of fan convectors have made them a popular choice in schools. Dunham-Bush have been manufacturing fan convectors with fresh air introduction for many years, allowing CO2 levels in a space to be monitored and controlled. These products have been improving the environment in classrooms quietly and often unnoticed. The success of these products has prompted the development of new and improved products to suit today’s requirements.
Good air quality in classrooms is good for academic performance as well as the safety of occupants. With air pollution levels continuing to rise in the UK, it has become increasingly important that these issues are addressed. Released by the government in 2018, BB101: ‘Ventilation, thermal comfort and indoor air quality 2018’ has been instrumental in the most significant changes in ventilation design, since 2006. Working in parallel with BB93: ‘Acoustic designs for schools, performance standards (2015)’, it gives a detailed approach to the internal environment in schools with the emphasis very much on energy efficiency.
The events of 2020 have focused even more attention on indoor air quality and while some new technologies have emerged, the fundamental approach of bringing more fresh air into buildings is still the most effective way to improve indoor air quality. Improved monitoring and better controls have provided more opportunities to optimise energy efficiency while providing better indoor air quality.
Fan convectors with fresh air introduction
Dunham-Bush offer a range of products from Series AM fan convectorsequipped with fresh air dampers and CO2 controls to networks of fan convectors with additional features.
The Smart-Vector range of fresh air fan convectors offer further innovative options to the client, ensuring recommended indoor air qualities (IAQ) are achieved. Smart-Vector’s provide demand-led tempered fresh air and heating using a stand-alone controller with local setpoint adjustment. Multiple heaters can be operated in master/slave configuration to ensure effective control in larger spaces.
There are five models in the Smart-Vector range: floor standing front outlet models SV19 and SV22; top outlet model SV88; high wall model SV53; and ceiling mounted SV80.
With nominal outputs ranging from 1.4kW to 14.6kW, comfortable conditions in the space can be maintained. All units incorporate variable air volume (VAV) control function, to maintain design conditions.
The Smart-Vector digital controller incorporates an integral CO2 and air temperature sensors. The controller provides modulating outputs to the fan, fresh air damper and control valve, ensuring optimum use of energy, low noise level and low CO2 levels, whilst achieving comfort in the space. The controller is compatible with Modbus or BACnet BMS.
Each unit is complete with a frost protection thermostat and spring return actuator, two or four-port valve and actuator, and energy efficient EC motors. Fan speed is infinitely adjustable to attain the necessary air flow without low noise. Stand-alone and master units also have low temperature cut-out (LTC) thermostats.
The Smart-Vent controller is used to provide additional features to a network of Smart-Vectors and utilises a central clock function to imitate pre-occupancy purging as well as day and night time free cooling. Smart-Vent can manage 32 zones and is particularly suited to buildings not equipped with a full BMS, such as refurbishment projects but where a level of central control is desirable.
Good air quality in classrooms is good for academic performance as well as the safety of occupants. With air pollution levels continuing to rise in the UK, it has become increasingly important that these issues are addressed.
The Smart Vent controller is configured with on/off switches and the central time clock, to simplify set up and operation.
Improved indoor air quality with heat recovery
The next step in the improvement of indoor air quality for schools can include heat recovery, not heat recovery by mixing fresh air with room air and exhausting a mixture of both but the use of a high efficiency metal heat exchanger, a design which ensures excellent specific fan power and very low noise in a compact unit.
The Classmasterheat recovery ventilation unit has been developed specifically for classrooms and along with all the VHR range of units now available from Dunham-Bush, fully complies with the latest BB101 and BB93 guidelines. With airflows ranging from 50 to 600l/s, Classmaster delivers the very highest standards of air quality.
Key features include a patented variable air mass flow heat exchanger, which maintains thermal efficiency at both 100 per cent and 50 per cent airflow. The unique configuration of low resistance heat exchangers, used in conjunction with EC fans, delivers minimal sound levels and excellent heat reclaim efficiency while monitoring and controlling levels of CO2 in the space.
Classmaster units have the option of ePM2.5 (F7) filters for inner city installations.
With a height of only 300mm, Classmaster 260 can be installed within a ceiling void or surface mounted. Space heating coils and frost coils are also available for the Classmaster range.
Versatile control options
The factory fitted Eco-Pro 3 controller offers stand-alone control for Classmaster products, with simple BMS interface connections when required. Individually adjustable fan speeds on trickle and boost settings with frost protection, automatic summer by-pass and night time free cooling options are included as standard. Fans that respond automatically to increasing levels of CO2. Where full BMS integration is required almost any industry standard controller can be incorporated into the Classmaster.