LAUSR

Abstract Heat transformers are very useful for upgrading thermal energy to a higher temperature level. Up until now, several heat transformer configurations have been proposed and studied. In general, these configurations have been designed to enhance the coefficient of performance or the gross temperature lift. However, the systems that enhance the gross temperature lift significantly reduce the coefficient of performance. In the present study, we propose a novel double-stage-double-effect heat transformer that makes it possible to achieve a high gross temperature lift without a significant reduction in the coefficient of performance. The proposed system was modeled. The main results are graphically represented and discussed in this paper. Moreover, a comparison of the performance of several heat transformer configurations is presented. The new configuration achieved a gross temperature lift as high as 82 °C and a maximum coefficient of performance of 0.46. Compared to a single-stage heat transformer, it is shown that for specific conditions, the proposed system achieves similar coefficients of performance but with considerably higher gross temperature lifts. Compared to a double-stage heat transformer, it is shown that with the proposed system, the coefficients of performance are always considerably higher and similar or even higher gross temperature lifts can be achieved.