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ENERGY MANAGEMENT & SUSTAINABILITY


HYBRID APPROACH With 40% of UK greenhouse gas emissions accounted for by heating, cooling


and ventilation in the built environment, Bill Sinclair, Technical Director at Adveco, suggests ways of meeting reduction targets.


In light of the government’s commitment to attaining net-zero by 2050, organisations will increasingly have to demonstrate how they are actively addressing the challenge to reduce emissions. The clear agenda is to adhere to a course of action that curbs global greenhouse gas emissions so that temperature rise remains ideally below 1.5°C within the established timeframe.


Currently, around 40% of UK greenhouse gas emissions are accounted for by heating, cooling, ventilation, the provision of hot water and lighting the built environment. The impetus then is to reduce construction impacts with whole life carbon assessments, and critically, reduce operational energy use, prioritising reduction in energy demand and consumption over all other measures.


This means in-use energy consumption will be calculated and publicly disclosed on an annual basis, as laid out in the new, mandatory Streamline Energy & Carbon Reporting (SECR) regime. This is designed to raise awareness of energy efficiency, reduce bills, and save carbon by driving an increase in renewable energy supply and prioritising on-site renewable energy sources.


Under the tenth draft of the government’s Standard Assessment Procedure (SAP) for building projects, released in July 2018, emissions related to electricity have dropped by more than 50%, a significant change that takes emissions down to 0.233kg CO2


/kWh. Before this 46 | TOMORROW’S FM


substantial change, electricity was considered 2.4 times dirtier than gas, today that ratio has dropped to almost one to one. These developments are obviously having a considerable impact on the mindset towards electricity as an energy source for heating and hot water to serve the built environment.


When it comes to the refurbishing of existing building stock, which is where the greatest advances can be potentially made, installing solar thermal is going to be better from a renewables’ perspective. But we also recognise that this approach can be constrained by limitations of space, delivery timeframes and budget. ROI can also be much slower to achieve, despite the welcome new Smart Export Guarantee (SEG) legislation, under the which SMEs installing new solar photovoltaic panels, will from 2020, be able to profit from exporting excess generated electricity to the grid.


The more popular option is to use heat pumps where a site with a small requirement for a domestic hot water (DHW) load will benefit in a big way from quick and easy installation of the technology. But, as is so often the case in the commercial world, each project will have its own specific requirements, and simply opting for heat pumps, providing a lower grade of heat, will not always be the most practical alternative. For sites exhibiting a large DHW load - from leisure and education to healthcare – there still remains a solid argument for employing


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