The flammable chemical ammonia is often used in refrigeration systems.
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The aptly named KryoTech firm uses refrigeration to supercool its systems' processors so that they outpace their rated clock speeds.
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Then there is the London-based TI Group, the global leader in making the tiny copper tubes found in brake systems and refrigeration components.
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The report by AEA technology said emissions of the gases, used in refrigeration, air-conditioning and heat pump systems, were "relatively small" at 3.9% of the total but were increasing.
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