The impact of heat exchanger degradation on the performance of a humid air turbine system for power generation

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dc.contributor.authorOrts-Gonzalez, Pau Lluis
dc.contributor.authorZachos, Pavlos K.
dc.contributor.authorBrighenti, Giovanni D.
dc.date.accessioned2019-01-31T19:22:04Z
dc.date.available2019-01-31T19:22:04Z
dc.date.issued2018-12-13
dc.description.abstractThis paper aims to analyse the impact of air-water heat exchanger’s degradation on the performance of a reheated humid air turbine system for power generation applications. A number of thermal models to simulate the performance of the various sub-systems was put together and validated against experimental data. The performance degradation of the heat exchangers is characterised by means of a degradation coefficient, which is used to drive the cycle into off-design and part-load conditions when degradation is accounted for. Three heat exchanger design scenarioswere investigated, namely a low, a medium and a high effectiveness in order for the impact of the degradation penalties on cycle thermal efficiency to be determined. The performance deterioration of the heat exchangers is also analysed from an exergetic point of view in order to identify the key sources that penalise the thermal efficiency of the humid air turbine system. The degradation analysis shows that typical levels of intercooler deterioration cause notable penalties in the cycle performance, reducing its thermal efficiency and power output by 1.8 percentage points and 28% respectively compared to the un-degraded operation. The exergy analysis showed that the deterioration of the intercooler also penalises the efficiency of the low pressure compressor and reheater, which contribute to the performance penalty of the cycle too. It is also found that the degradation of the intercooler can also lead to operability penalties at the low pressure compressor by reducing its surge margin. The effects of the deterioration of the aftercooler and economiser were found to only have a weak effect on the system’s performance. The outcome of the work constitutes a step forward in understanding of the performance behaviour of an advanced cycle when heat exchanger degradation is present.en_UK
dc.identifier.citationOrts-Gonzalez PL, Zachos PK, Brighenti GD. (2019) The impact of heat exchanger degradation on the performance of a humid air turbine system for power generation. Applied Thermal Engineering, Volume 149, February 2019, pp. 1492-1502en_UK
dc.identifier.cris22264414
dc.identifier.issn1359-4311
dc.identifier.urihttps://doi.org/10.1016/j.applthermaleng.2018.12.061
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/13871
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectHumid air turbineen_UK
dc.subjectEvaporative gas turbineen_UK
dc.subjectHeat exchangeren_UK
dc.subjectDegradation analysisen_UK
dc.subjectExergy analysisen_UK
dc.titleThe impact of heat exchanger degradation on the performance of a humid air turbine system for power generationen_UK
dc.typeArticleen_UK

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