Thermodynamic analysis on the part-load performance of a microturbine system for micro/mini-CHP applications

Thu Kyaw, Bidyut Baran Saha, Kian Jon Chua, Thuan Duc Bui

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

A gas turbine system is extensively investigated for micro/mini-Combine Heat and Power (CHP) applications. The prime mover in the system, i.e., the microturbine, has a nameplate electrical capacity of 65 kW while the coupled Waste Heat Recovery System (WHRS) produces 112 kW. Experiments were conducted for assorted power demands spanning from part-load to full-load operations. A simple thermodynamic model together with a nonlinear optimization scheme is applied to determine the properties at various state points that are not provided by the manufacturer. The second law analysis and the Energy Utilization Factor (EUF) technique are employed to assess the efficacy of the system. The actual chemical compositions of the CNG, the exhaust gas, the moist air and subsequently the amount of water condensation at the dead state are accounted for in the analysis. Here, the excess air usage in the combustion process at various loads is quantitatively reported for the first time. The results show that the combustor is responsible for almost 70% of the total exergy destruction followed by the recuperator, the compressor, and the turbine in the descending order. The first law efficiency of the system varies from 15.7% at 25% load to 28.95% for full load operation. The itemized exergetic efficiency for all the processes is evaluated while the second law efficiency of the overall system is found to be around 30.4% at full load condition. The presented results pinpoint the bottleneck of the microturbine operation, particularly at part-load conditions and are crucial in designing and performance mapping of an optimized cogeneration system.

Original languageEnglish
Pages (from-to)600-608
Number of pages9
JournalApplied Energy
Volume178
DOIs
Publication statusPublished - Sep 15 2016

Fingerprint

turbine
thermodynamics
Thermodynamics
exergy
cogeneration
air
Nameplates
Recuperators
condensation
combustion
Exergy
chemical composition
Waste heat utilization
Exhaust gases
Air
Combustors
Gas turbines
Compressors
Condensation
Turbines

All Science Journal Classification (ASJC) codes

  • Building and Construction
  • Energy(all)
  • Mechanical Engineering
  • Management, Monitoring, Policy and Law

Cite this

Thermodynamic analysis on the part-load performance of a microturbine system for micro/mini-CHP applications. / Kyaw, Thu; Saha, Bidyut Baran; Chua, Kian Jon; Bui, Thuan Duc.

In: Applied Energy, Vol. 178, 15.09.2016, p. 600-608.

Research output: Contribution to journalArticle

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