| 摘要 |
A heat transfer system comprises a heat source 19; a heat load 8, 9; a heat exchanger 12 for transferring heat from said heat source to said heat load, the heat exchanger comprising: a hot side having an input 123 and an output 124 and a cold side having an input 121 and an output 122; temperature sensors 321, 322, 323, 324; 401, 402, 403, 404 placed to measure the temperatures of input and outputs of the heat exchanger 12; and a means for monitoring the thermal efficiency of the heat exchanger 12 that is arranged to calculate the thermal efficiency based on the measured temperatures; wherein a change in thermal efficiency of the heat exchanger 12 is determined by measuring the thermal efficiency at a first time and a second time; wherein the heat transfer system is arranged to predict when the heat exchanger 12 will reach a pre-determined thermal efficiency using the measured thermal efficiency values; and wherein the pre-determined thermal efficiency is determined based on the current heat exchanger 12 thermal efficiency and the temperature in a return to the heat exchanger 12. |
