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Case study 1: Bolsover District Council – voltage optimisation systems Bolsover District Council is to reduce CO2


emissions by up to 51 tonnes and save an estimated £9,700 in


electricity costs per annum, following the installation of two Powerstar voltage optimisation systems. A 250 kVA unit has been installed at the Council’s main Sherwood Lodge offices and a smaller 90 kVA unit has been fitted at their Riverside Depot. Voltage optimisation is a cost efficient way to control a building’s incoming voltage in order to maximise


energy savings. Powerstar – designed and manufactured by Rotherham based EMSc (UK) – claims to save up to 26 per cent of total electricity consumption and related CO2


emissions, all without compromising the


supply to electrical equipment. A full onsite survey was carried out by EMSc at both locations to determine the correct size of unit and guaranteed level of CO2


savings and energy reductions that the Powerstar voltage optimisation systems will


achieve. Terry Shemwell, Powerstar consultant (Local Authorities and Public Services) UK said: ‘On the face of it, lowering the voltage sounds straightforward, but it’s actually much more complex and demands an engineering solution to what is an engineering problem. That’s why we carry out the onsite survey first and build a bespoke Powerstar unit for each client.’


carbon reductions, that shows clients the ways in which electrical contractors can help them bring down their energy bills and reduce CO2


emissions. It highlights key technologies, as well as renewables, such as:


Lighting n Optimal lighting configurations (eg reflectors, dimmer circuits);


n Energy efficient lamps and luminaires, for both internal and external lighting; and


n High-frequency luminaires (ballasts). Case study 2: Memera energy monitoring


The latest additions to the Memera range of consumer units from Eaton’s Electrical Sector have integral energy monitoring facilities, making them a convenient and cost-effective solution for local authorities seeking to improve their performance against National Indicator 186, which targets their CO2


emissions.


In properties where energy monitors with real-time displays have been installed, it


has been found that users are readily achieving sustained reductions in energy usage of between five per cent and 20 per cent, by simply changing the way they use electricity. The Local Government Performance Framework has reduced the central government burden on local authorities, but has increased direct accountability. Underpinning the framework is a series of National Indicators (NIs) against which the performance of local authorities is now measured. Among these is NI 186, which deals with the per-capita reduction in CO2


emissions in the local authority area, and effectively obliges local authorities to find ways of continually improving their emissions performance. While CO2


emissions relating to energy used in domestic properties account for a


significant proportion of the whole, reducing domestic energy use has, in the past, been difficult. Eaton’s new Memera consumer units with integrated efergy wireless energy monitors can now offer an effective and affordable way of addressing this crucial issue, by encouraging the behavioral changes required to effect these reductions. Designed primarily for use in new installations and for incorporation during major


refurbishment work when a new consumer unit is also being fitted, these new units feature a wireless energy-monitoring transmitter and sensor pre-installed by Eaton.


Heating and ventilation n Adjusting thermostats (cooling, heating and hot water); n Timers or programmable thermostats that turn off heating/cooling/hot water systems when the building is unoccupied; and


n IT centre cooling (optimising computer room air conditioning, indoor temperature control and air discharge temperature).


Control and monitoring n Improved local metering, to allow staff (and energy assessors) to see how much energy is being used and where;


n Lighting controls; n Building management control systems (BMS); n Wireless and network controls; and n The latest controllers for specific equipment such as boilers, pumps and fans.


As Rachel Cooper points out, monitoring is an essential first step towards identifying energy savings.


Sensors and timers n Sensors to allow lighting (interior and exterior) to respond to daylight;


n Allowing lights to operate via motion (presence) detectors in shared areas (eg conference suites or washrooms); and


n Out of hours timers on building support equipment, drinks machines, etc.


Clients’ buildings n Insulation (including advice on the safety of electrical services close to insulation); and


n Automatic shading or blinds to reduce solar gain.


Clients’ equipment n Variable speed and energy efficient motors; n An effective maintenance programme; n Optimising transformers;


46 ECA Today Winter 2010


For more on lighting, see the article Making light work in the Autumn 2010 edition of ECA Today (pages 18-21).


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