Temperature-heat diagram analysis method for heat recovery physical adsorption refrigeration cycle - Taking multi-stage cycle as an example

The method of temperature-heat (T-Q) diagram analysis was proposed in this article. In T-Q diagram, the area between two process curves along the temperature axis represents the irreversibility degree of heat transfer, which has the same dimension with entransy dissipation. T-Q diagram can be used to optimize the heat exchange configuration and the heat exchanger network of adsorption refrigeration systems. The proposed T-Q diagram and traditional energy, exergy and entropy analyses were adopted to a multi-stage heat recovery adsorption refrigeration system. Results show that the optimal heat recovery schemes determined through T-Q diagram and cycle entropy production analyses are identical, while T-Q diagram is more intuitional since the analysis procedure is done graphically. T-Q diagram can also be applied to analyze experiment related results of process temperatures, and is capable of giving an estimation of the performance improvement for heat recovery cycle.