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New food chilling method offers energy and cost savings
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Researchers on a pioneering two-year project claim they have adapted the combined heat and power technique, which allows companies to produce electricity and heat on-site from small gas-turbine generators, to include refrigeration.
Using the new combined heat, power and refrigeration system (CHRP), food companies would be able to feed waste heat produced by the generators into an absorption chiller, which could then provide the necessary temperatures for frozen and chilled foods.
Researchers described initial feasibility tests as “very encouraging”, and said they expected the project, which is still in its early stages at Britain’s Brunel University in Middlesex, to achieve a 50 per cent reduction in energy usage within two years.
The project team said this provided companies with considerable scope to drive down costs and added that CHRP also had the potential to compete on price with carbon, the raw material commonly used in energy production.
This, said the team, was mainly because the new technology’s environmental sustainability should make it exempt from the Climate Change Levy introduced on UK-based companies’ coal, electricity and gas bills in 2001. The levy alone increased average electricity costs by 10 per cent between 2003 and 2004, according to government figures.
The ‘green’ nature of CHRP could also be crucial for food processors and retailers who together consume 15 per cent of the national energy supply in Britain and now face stern governmental and international pressure to reduce greenhouse gas emissions.
EU member states and the Commission have agreed to introduce regulations to reduce emissions of fluorinated gases, used widely in industrial refrigeration, as part of their implementation of the Kyoto treaty on climate change.
These gases, including hydrofluorocarbons (HFCs), perfluorocarbons (PFCs) and sulphur hexafluoride (SF6), only account for two per cent of EU carbon emissions yet are thought to have a global warming potential almost 24,000 times stronger than carbon dioxide.
Meanwhile, the UK government is already pressuring food firms to consider sustainable energy alternatives, such as combined heat and power system, to help the country achieve a 60 per cent reduction in carbon emissions by 2050.
The researchers at Brunel, jointly funded by the government and a food industry consortium including supermarket Safeway, believe three to five micro-turbines could use CHRP to deliver all the refrigeration needed at a typical large supermarket. And the technology could be applied across the whole food industry such as in cold stores, food-freezing factories and freeze-drying plants.
Some in the industry have already taken notice of the potential benefits offered by such as system. Dairy and confectionery producer Kraft Foods last year announced it would spend $960,000 to install a $3 million combined heat and power system at its New York cheese plant.
CHRP is still some way behind, yet a report on the current UK project says a system could launched commercially by 2007 once the technology has been properly developed and patented.
A special type of absorption chiller is currently under development at Brunel and the project team, led by former supermarket worker Doug Marriott and Brunel-based Professor Savvas Tassou, will spend the next few months focusing on the design of this and also associated heat exchangers.
They will then transform part of the university into a mini-supermarket to test the complete system using micro-turbines produced by UK company Bowman Power Systems.
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| Company Name: |
The English Lab |
| Contact Person: |
Niquesha Pamphile |
| Country |
, gb  |
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