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Thermal testing of vehicle heat exchangers used to be (and in some cases still is) a matter of manually adjusting fluid conditions to the device under test, waiting for stability and writing to a clip board measured physical values. Heat rejection figures were then calculated based on the temperature change of one fluid and results were often plotted on squared paper as they were derived. The validity of each test point was assessed by the Test Engineer on the basis of his/her experience, expectation and fit on the curve, bad points being repeated at once. The contemporary need to value-engineer products together with the advent of low cost computing power has influenced these practices.