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VENTILATION, DUCTWORK AND GRILLES


Making air


diffusion beautiful I


By Paul Russon, managing director at Ventmann UK.


remember my time at the nationwide wholesaler NRS in the 1980’s with affection. It was my first technical job


‘off the tools’ and in the office. It was a great team, we enjoyed working together and felt valued by the company. My role, having stepped into a suit for the first time was a technical one, resolving problems with equipment performance, also designing commercial sized systems and selecting equipment for customers. Having performed the heat loss calculations needed, I was matching Prestcold condensing units with Searle evaporators, selecting pipe sizes and expansion vales etc. Life (it seems now) was simple. R12 for fridge, R22 for air conditioning and R502 for freezers. Condensing unit selections always at that time assumed a maximum summer ambient temperature of 32°C. I think about that often now, 32°C maximum summer ambient. It may sound a little irresponsible to select for that ambient temperature now – but back then, it seemed inconceivable that the UK would exceed 32°C ambient in summer for


28 October 2022 • www.acr-news.com


more than a few days – a week at most. My wife is French, and we visit often to see family. In 2003 France experienced more than 40°C ambient temperatures for several weeks. Thousands of people died in Paris alone. It shocked the nation. In 2022 we reached over 41°C in the UK for the first time since records began. It’s clear then that demand for air conditioning in domestic and commercial premises is only going to grow over the coming years – and, for the foreseeable future with energy prices rising like an unrestrained helium balloon, better insulated building with lower energy costs for heating are also becoming significant factors for developers, retailers and home owners. Additionally – not forgetting the Covid effect – there is also a greater demand for improved building ventilation and air quality resulting in higher demand for MVHR system installations.


A different approach Throughout history, indoor temperature control was achieved through resourceful


architecture coupled with clever use of the local environment. We still need warmth in winter, not just cooling in summer. But it’s becoming painfully clear that our approach to indoor temperature control needs to adapt to increasingly frequent heatwaves whilst continuing to be suitable for the typically cold winters we already build for. Time- honoured methods used to passively cool buildings in hotter countries, such as higher ceilings in Southern Europe, or the central passageways in traditional machiya of Kyoto, aren’t suitable for a mild temperate oceanic climate that tends towards moist air and cool temperatures.


The highly efficient modern buildings to which we are now transitioning to are insulated primarily to keep the heat in, but the same insulation helps keep the heat out in the summer. A consistently overlooked element in the quest for better climate control and ventilation is: what will the end result look like? When all is said and done, designs finalised, heat pumps installed and


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