Abstract
Absorption heat transformers are effective systems for a wide variety of applications; however, their main purpose is to upgrade thermal energy from several sources at low-temperature up to a higher temperature level. In the literature, several advanced configurations for absorption heat transformers have been reported which are mainly focused on the improvement of the gross temperature lift by the use of a double absorption process; however, these systems usually offer a reduced coefficient of performance. The present study proposes a new advanced configuration of an absorption heat transformer that improves the coefficient of performance utilizing a double generation process. The operation of the new configuration was numerically modeled, and the main findings were discussed and presented emphasizing the effect of several parameters on the system performance. The highest coefficient of performance and gross temperature lift were 0.63 and 48 °C, respectively. From its comparison with a single-stage heat transformer, it is concluded that the proposed system may achieve coefficient of performance values up to 25.8% higher than those obtained with the single-stage system, although achieving lower gross temperature lifts.
Highlights
In the last decades, the utilization of absorption heat transformers (AHT) has been the focus of attention of engineers and scientists, mainly due to the high potential that this kind of systems offer to upgrade thermal energy from a low-temperature source up to a higher temperature level for several practical purposes, at a relatively low cost
From the comparison presented for both systems, it is possible to observe that the single-stage heat transformers (SSHT) can operate at generation temperatures from 70 °C, can achieve gross temperature lifts (GTL) values up to 63 °C and can deliver useful heat at absorber temperatures of 148 °C, obtaining a maximum coefficient of performance (COP) value of 0.48
A new configuration system called double-effect heat transformer operating with water/LiBr has
Summary
The utilization of absorption heat transformers (AHT) has been the focus of attention of engineers and scientists, mainly due to the high potential that this kind of systems offer to upgrade thermal energy from a low-temperature source up to a higher temperature level for several practical purposes, at a relatively low cost. Three review papers have been published on the research of AHT, which were realized by Parham et al [1], Donnellan et al [2] and Rivera et al [3]. These three papers summarized some of the applications of theoretical and experimental systems working with different mixtures. The papers cited below are some of the most outstanding investigations about advanced configurations found in the literature
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