n inverter is used to vary the speed of the motor to match the required load. In most cases, fans are specified to match the

maximum ventilation requirements of the setting. Installing an inverter allows the user to control the speed of the fan motor to match the actual ventilation needs, rather than run the fan at full power constantly. An inverter can vary the motor speed with no loss of efficiency. Inverters can be used for simple speed control on a permanent

basis or linked to controls which can change between pre-set speeds, dictating the amount of time that the fan runs at full speed. When linked with a sensor system, inverters can prove to be even more effective by controlling the motor’s performance based on any number of pre-defined settings. These settings usually relate to factors like temperature, air flow or humidity and remove the need for manual adjustment.

HOW DO INVERTERS SAVE ENERGY? Reducing the speed of the motor will reduce the amount of energy needed to power it. The reduction in energy can be by as much as eight times the reduction in speed. The resulting energy savings usually pay for the inverter in a relatively short period of time. Due to recent ERP regulation changes, some motor sizes and

efficiencies can now only comply if used with an inverter. Whilst inverters play a key role in energy saving initiatives, there are

further benefits to speed control. Reducing the amount of time that the motor runs at full speed will reduce the strain on the motor and any related components. The motor only works as hard as it needs to, so helping to prolong the service life of the motor and the whole system. This results in lower maintenance requirements and, again, lowers costs. The improved control provided by an inverter also makes it easier to

stop the ventilation system; another factor which can impact on the wear and tear of the mechanical components. Other forms of fan control, such as dampers, simply change the

resistance of the system with the fan on full speed, so do not save energy. Inverters also make it easier to commission the fan with the equipment it is extracting from, as the system can be controlled in one place and there is no need to make alterations to ducting. Axair’s inverter models can run off a 230/1/50 electrical supply and

convert it to a 230/3/50 supply into the fan motor. Other models run off a 400/3/50 supply with a 400/3/50 to the fan motor. The inverter is simple to set up and easy to use. It has an on/off

switch and a potentiometer to control the speed on the front of the unit. There are two levels of ingress protection available; IP20 or IP66. The IP66 version is suitable for hose down but if installed outdoors may need additional protection. The inverter also has the option of being connected into the building management system.



viva has launched an integrated package of insurance, designed specifically to support large companies in the complex market of

renewable energy, including onshore windfarms, solar power and battery storage. Aviva Renewable Energy covers all the insurance needs of renewable

energy companies globally which have operations in their home and overseas markets. Insurance is a key requirement for lenders in the renewables market.

It provides Aviva’s commercial customers with a single package of insurance available through one underwriting team to cover the whole life cycle in the following areas: • Marine project cargo • Construction and operational • Third party liability • Terrorism cover

Designed for global renewable energy brokers and their commercial clients, Aviva Renewable Energy signals the insurer’s recognition of the specific needs of this growing market, and the important role renewable energy plays in the fight against climate change.

Aviva Axair Fans 32 WINTER 2019 | ENERGY MANAGEMENT 



ontrollis has developed a carbon neutral site power system to help support a net zero emissions economy, established by the Paris

Agreement. The new system, Controllis Zero will allow off-grid and poor-grid sites to produce cleaner energy overall by replacing their dependency on fossil fuels with an eco-friendly biofuel alternative. Based on Controllis’ Modular48 DC power system, (which already

reduces carbon emissions by up to 90 per cent by harnessing solar power and rechargeable lithium ion batteries), Controllis Zero will allow MNOs

and tower companies to overcome the final ten per cent of the CO2 emissions challenge. Controllis has been able to achieve this carbon neutral status by

considering the carbon cycle process in its entirety and adapting its unique DC generator technology to run on E100 bioethanol instead of diesel. All this is accomplished without compromising network uptime. According to the GSMA, there are more than one million

off-grid/poor-grid telecoms sites in use globally, which combined are generating a carbon footprint greater than countries such as Nepal, Cambodia and Cameroon. By leveraging the environmental benefits of biofuels and supporting ethically approved CO2

as tree planting or renewable energy sources for remote communities, Controllis Zero is poised to help large Telco’s meet their legal, shareholder and green obligations. “With global warming increasing and net zero targets looming,

companies are under increasing pressure to operate in a more sustainable way,” explained Simon Albury, managing director of Controllis. “Controllis Zero has been developed with efficiency initiatives such as OFGEM’s ECO in mind and any CO2

released during energy production is offset by a

carbon neutral biofuel manufacturing process.” Controllis Zero will be commercially available from Q1 2020.


offsetting processes such

Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36