Discussion Regarding the Principles of Exergy Analysis Applied to HVAC Systems

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Exergy is another name for available energy that measures the ability of the energy source to produce useful work. This article provides an analytical review of some pertinent works in HVAC application. Some general conclusions can be obtained. Exergy efficiency is more rational than energy efficiency; exergy analysis is more helpful than energy analysis for locating and evaluating available energy saving potentials, identifying opportunities for improvements in system design and establishing cost effective system maintenance programs. In addition, an unusual selection of dead-states novel to HVAC applications is suggested, which simplifies the exergy analysis by eliminating the necessity of calculating the exergy of water at ambient temperature (T_0). Such a selection will also make it easier to evaluate the precooling capacity of moist air. In this paper, the authors also suggest a functional classification to break down the HVAC project in a hierarchical structure for exergy analysis. The HVAC system is considered as an exergy service system that provides exergy for pure consumption in exergy consumer systems such as conditioning space. The exergy service system can be further broken down into different components. The exergy flows are also classified according to their functions as source exergy flow and service exergy flow to assist the evaluation of the performance of the systems or components. Relevant principles of exergy analysis are discussed. Finally, examples are calculated to demonstrate the application and the reasonability of the above propositions.
社団法人日本建築学会の論文
2002-03-20

Discussion Regarding the Principles of Exergy Analysis Applied to HVAC Systems

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