Chillers 35
achieve more than 95% of the year in full or partial free-cooling mode (cumulative hours, London, UK).
Under these conditions, a free-cooling chiller such as the TurboChill or DeltaChill could generate energy savings of up to 50% compared with a conventional chiller.
Refrigerants
In line with the EU phase-down in the use of hydrofluorocarbons (HFCs) which is expected to lead to restrictions in the supply of traditional commercial cooling refrigerants by 2030, Airedale has now adopted R1234ze as the most suitable replacement for R134a.
R1234ze is a hydro-fluoro olefin (HFO)-based isomer which breaks down in the atmosphere within just 16.4 days, compared with 14 years for R134a, and is rated by the International Panel for Climate Change (IPCC) with a 100-year
GWP lower than 1, better than CO2. In contrast, R410A and R134a have GWPs of 2088 and 1430 respectively. With the addition of R1234ze, the Airedale TurboChill automatically receives two BREEAM points in recognition of its low global warming impact. In contrast, R134a TurboChill and TurboChill Free Cooling TCF variants receive one point for their Direct Effect
Life Cycle (DELC) CO2 equivalent emissions of 1000 kgCO2e/kW cooling capacity and a further point for leak
detection and automatic shutdown and pump-down of refrigerant. Selecting the most efficient components is relatively straightforward and each can be applied in an inefficient way.
Airedale’s expertise lies in combining the best technologies and optimising them, via our patented head pressure control system so that we achieve the most efficient operating point at all times. Through extensive mathematical modelling we are able to build control
algorithms to optimise all the components for maximum performance and minimum power draw.
Not forgetting the refrigerant itself – R1234ze – which has been proven to have a 3% improvement in coefficient of performance over its R134a alternative.
www.airedale.com
Andrews Sykes
Visit ACR News online at
www.acr-news.com
ACR News August 2015
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