Temperature-heat diagram analysis method for multi-stage heat regeneration physical adsorption refrigeration cycle.

The method of temperature–heat (T–Q )diagram analysis was proposed in this paper. In T–Q diagram, the area between two process curves along the temperature axis represents the irreversibility degree in the heat transfer process, which has the same dimension with entransy dissipation. The diagram can be used to optimize the heat exchange configuration and the heat exchanger network of an adsorption refrigeration system. The proposed T–Q diagram and the traditional COP, exergy and entropy analysis were adopted to a multi-stage heat regenerative adsorption chiller under different heat regeneration schemes. The results show that the optimal scheme determined through T–Q diagram and cycle entropy production analysis are identical, while T–Q diagram is more intuitional since the analysis is done graphically. If consider a complete heat regeneration between two adsorption beds, the performance of the multi-stage chiller with different heat regeneration schemes should be almost the same.