Searle GF gas coolers for CO 2 refrigeration systems – smaller heat exchanger tubes for increased heat transfer
14. 10. 2016 Less refrigerant content, a smaller footprint, and significantly reduced weight – Kelvion has enabled all this with its redesigned Searle GF gas coolers for transcritical CO 2 refrigeration systems. These gas coolers, equipped with AC or EC motors, profit from the new heat exchangers with tube diameters of only 5 mm. The reduced diameter tubes – which are ideal for CO 2 as refrigerant, with its favorable thermal properties – allow cost-efficient solutions for applications with high pressures.
Kelvion developed its Micro Tubes with the aid of numerical flow simulation and optimized them in prototype tests in a wind tunnel. These tests revealed that a non-equilateral tube configuration represents an optimal solution. The result is heat transfer that is 18 % greater than the most efficient Kelvion heat exchangers until now. As a result, smaller heat exchanger surface area is required for the same cooling duty – which means in turn a reduction in cost, size, and weight. The use of Micro Tubes and CO 2, in addition, reduces the refrigerant charge to approx. half of that in standard coolers. GF gas coolers are available with stainless steel or copper tubes, or with tubes made of copper alloy. Before delivery and installation, the tubes are tested for pressure strength at over 170 bar.
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