Thermodynamic performance assessments of a district heating system with geothermal by using advanced exergy analysis

Abstract

a b s t r a c tThis paper relates to thermodynamic performance assessment of a geothermal district heating system (GDHS) using advanced exergetic analysis to identify the interactions among system components and the potential for improvement. It is introduced four new exergetic parameters, namely the exergetic fuel depletion ratio, the exergetic productivity lack ratio, the exergetic rehabilitation ratio, and the exergetic improvement potential for a GDHS. This analysis and new exergetic parameters are applied to the Bursa GDHS in Turkey. The results show that the advanced exergetic analysis is a more meaningful and effective tool than the conventional one for the system performance evaluation. The exergetic efficiencies for the conventional and advanced ones are 25.24% and 26.34%, respectively. The highest priorities for improvement of system components are in descending order of importance: the heat exchangers and the pumps for the conventional analysis, and only the heat exchangers for the advanced analysis. New exergetic parameters appear to be key indicators to show how much the system is improvable and apparently sustainable. The ratios of these parameters in the order given above are respectively 4.19%, 16.60%, 33.23% and 4.19%, for the Bursa GDHS. The heat exchangers have the highest values of exergetic rehabilitation ratio. Thus, there are improvement priorities of the heat exchangers.

Energy and exergy based evaluation of the renovated Afyon geothermal district heating system

“…The results showed that the advanced exergetic analysis was a more meaningful and effective tool than the conventional one for the system performance evaluation. The exergetic efficiencies for the conventional and advanced ones were 25.24% and 26.34%, respectively [30].…”

Centralized control of district heating networks during failure events using discrete adjoint sensitivities

“…The large scale utilization of locally available heat sources makes District Heating (DH) a rational and efficient domestic heating option. To date, this technology has been coupled successfully to high efficiency Combined Heat and Power (CHP) plants [1,2], energy-intensive industries [3,4] and renewable gen-5 eration plants such as solar [5,6], biomass [7,8] and geothermal systems [9,10].…”

Energy and exergy optimization of food waste pretreatment and incineration

“…Therefore, exergy analysis is also conducted to incorporate energy quantity and quality at the same time. Exergy is defined as the maximum potential of work obtainable from a substance or a system while it approaches to the reference environment reversibly (Yamankaradeniz 2016). By conducting exergy analysis, the thermodynamic performance of the novel FW treatment system can be identified from an energy quality perspective.…”