Enhanced version of the Thorp method of verifying surveys of performance of conventional water chilling machines

This report presents a step-by-step guide on how to draw the acceptability plot, and how, once this plot is drawn, to interpret the position of the load error lines in relation to the acceptability window. As emphasized, the acceptability plot can only be used with machines where all confirming measurements in the refrigerant circuit necessary to obtain an accurate estimates of the true COP are obtainable, such as with conventional machines. Moreover, such machines must be operating normally, and their refrigerant circuits must be in good order.