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Advanced exergy analysis has gained great importance as a comprehensive evaluation tool for energy conversion systems in recent years. In this regard, splitting the exergy destruction into avoidable/unavoidable parts has enabled us to identify the improvement potential of component while endogenous/exogenous parts of the exergy destruction have been detailed studied to get more information about interactions among the components. An ice rink refrigeration system was investigated using both conventional and advanced exergoeconomic analyses in this paper. The ice rink refrigeration system has a cooling load of 300 kW and ammonia was chosen as refrigerant. Exergy destruction, investment cost rates and exergy destruction cost rates based on these two analyses were calculated first. Endogenous/exogenous and avoidable/unavoidable parts of the exergy destruction, investment cost rates and exergy destruction cost rate for each system component were then presented. Finally, possible solutions to reducing inefficiencies were discussed. It was determined that 47.15% of the total exergy destruction of the system was avoidable while 22.89% of the total exergy destruction of the system was exogenous. The evaporator with 18% endogenous available investment cost rate and the condenser with 64.3% endogenous available exergy destruction cost rate were the two most important components in the ice rink refrigeration system.

WOS: 000350706400001, Buildings are of great importance in terms of consumption of energy all over the world. Building sector has a significant influence over the total natural resource consumption and is significant contributors of greenhouse gases. Exergy-based methods in assessing the performance of buildings have become very popular in recent years. In this context, conventional exergoenvironmental methods include exergy and life cycle analysis and are considered to be very reliable to evaluate environmental impacts of any system. Advanced exergoenvironmental analysis is a combination of advanced exergy analysis and life cycle assessment. This study deals with determining the environmental effects of a building heating system at various stages. Advanced exergoenvironmental method is applied to the system from the primary energy transformation to the environment. Using advanced exergoenvironmental analysis relations, between the components and the stages (endogenous, exogenous parts), the improvement potentials (avoidable and unavoidable parts) and the advanced exergoenvironmental rates for the system stages are determined. A parametric study is undertaken to investigate effects of the environment temperature on exergy destruction rates and the environment temperature on efficiencies. Based on the environmental temperature, a sensitivity analysis is also performed for exergy destruction rates and efficiencies. Results show that the exogenous environmental impact of the system is 68.6% while the avoidable exergoenvironmental impact is only 7%

WOS: 000343363700027, The main objective of the present study is to model, analyze and assess a building heating system along with its main components through advanced low exergy method. This method is shortly called ADLOWEX and combines advanced exergy (AD) with low exergy (LOWEX) for the first time by the authors. In the ADLOWEX analysis method, a building heating system is investigated from the energy production to the building envelope by dividing exergy destructions into four basic parts, namely endogenous, exogenous, avoidable and unavoidable exergy destruction rates first. The mexogenous exergy destructions for all components are determined. The endogenous and exogenous exergy destructions of the system are 27% and 73% while the avoidable and unavoidable exergy destructions are 26.2% and 73.8%, respectively