www.heatingandventilating.net E


xamining the make-up of the system fl uid will point to the causes of issues such as erosion, corrosion and biological contamination, each


of which can aff ect the effi ciency and performance of the unit. “All schools, colleges and universities will be looking to operate an effi cient heating system, not only to ensure their students have a comfortable environment in which to study but also to reach environmental goals,” said Steve Simmonds, special projects engineer for Spirotech. “As the market moves increasingly towards


more sustainable, energy saving technologies and reducing carbon footprints, so the quality of the fl uid within systems becomes ever more important – in fact, it’s the single most important ‘component’ of the system,” he said. The focus on better heating has been highlighted


by the Government within its decade-long Schools Rebuilding Programme, under which it is seeking to transform 500 schools into ‘modern energy-effi cient buildings’.


This includes the replacement of ageing systems with upgraded ‘green’ models, contributing to schools operating to carbon Net Zero. Spirotech off ers two levels of testing; a basic


water sampling, and a full water analysis and in- depth report.


Mr Simmonds said: “Good water quality management within a properly set up system will combat corrosion and scaling and prevent


the build-up of potentially toxic micro-organisms, while also delivering greater effi ciency, reduced maintenance and, ultimately, a longer system life. “And, it is just as important to test the quality of the water when commissioning a new system as it


HVAC for schools


Test the school system water quality


Estate managers and M & E contractors advising schools struggling with an ailing heating system can fi nd the answer to their problems by testing the condition of the water within it, says solutions provider Spirotech


is with one that has been installed a long time, as that will help it run at optimal levels from day one.” Spirotech has extended its CPD portfolio to include a presentation on managing system water quality to achieve a high functioning heating or cooling system. The CPD, ‘Understanding Water Quality & Total Solutions’, identifi es common problems caused by poor water quality, from balancing issues and pump ineffi ciency to kettling and poor circulation. Other topics covered include hydronic stability, the latest regulations and guidelines, how water conductivity causes corrosion, along with other factors such as the impact of hard and soft water. Bacterial contamination in closed heating and chilled water systems is also examined and explained.


Air-to-water heat pumps to tackle school decarbonisation project “A key project challenge has been ensuring


More than 180 Carrier AquaSnap 61AF air-to-water heat pumps are being deployed in 60 schools in Southwark Diocese and Barnet in London, and Dudley in the West Midlands, reducing carbon emissions and cutting energy bills The multi-million-pound project is funded under


the UK’s Public Sector Decarbonisation Scheme (PSDS) to decarbonise heating in schools and other public buildings. Carrier AquaSnap 61AF air-to-water heat pumps


were selected for the project by Asset+, one of the UK’s leading independent Energy Performance Contractors. The project involved close collaboration between project partners Asset+, Carrier, and installer OMNI Heat and Power Ltd.


Above: Decarbonising London one school at a time


electrical loads at schools were not exceeded,” said Richard Hall, senior project manager, Asset+. “Heat pumps cut overall energy consumption and carbon emissions by displacing gas heating very effi ciently, however they do add an additional electrical load. Headroom in relation to school power supply is often a constraint on site, and we had to plan loads carefully to ensure limits were not exceeded.” He added: “Carrier heat pumps are highly effi cient, which is a major advantage in this area, while other low-energy and renewable technologies being installed, such as photovoltaic solar panels and LED lighting, contribute to reducing power loads.” Carrier AquaSnap 61AF air-to-water monobloc heat pumps are specifi cally designed for domestic hot water production and heating in new and refurbished buildings. Generating a water temperature of up to 65˚C, they are based on high- effi ciency, quiet-running scroll compressors and have a compact footprint and low profi le, saving valuable space on site. The unit has an extended range allowing it to continue operating when outside temperatures fall to as low as -20˚C. For contractors, the plug-and-play design enables quick and easy installation and commissioning on site. Simplifi ed electrical and pipework connections with side panels that can


Right: Carrier’s 61AF heat pumps are based on high-effi ciency, quiet-running scroll compressors, and have a compact footprint and low profi le, saving valuable space on site


quickly be removed for easy access are also features that aid in installation. “We are delighted to be part of this


decarbonisation project and playing our part in contributing to the UK’s national eff ort to achieve Net Zero carbon by 2050,” said Lynn Anderson, headteacher, Trinity St Mary’s CE Primary School, Wandsworth. “As a school, we have a particular responsibility to the next generation not only in educating about the importance of caring for our environment, but in taking active steps where possible to make a diff erence. Installation of the heat pumps is a great example to be able to use in our teaching. The installation team have done a brilliant job on site, and on behalf of the school I would like to thank them for their professionalism and helpfulness throughout the project.”


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