IJE TRANSACTIONS A: Basics Vol. 28, No. 4 (April 2015) 608-617   

PDF URL: http://www.ije.ir/Vol28/No4/A/16-1932.pdf  
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M. H. Seyyedvalilu, F. Mohammadkhani and S. Khalilarya
( Received: October 11, 2014 – Accepted: January 29, 2015 )

Abstract    This paper presents exergy and exergoeconomic analysis and parametric study of a Diesel engine based Combined Heat and Power (CHP) system that produces 277 kW of electricity and 282 kW of heat. For this purpose, the CHP system is first thermodynamically analyzed through energy and exergy. Then cost balances and auxiliary equations are applied to subsystems. The exergoeconomic analysis is based on specific exergy costing (SPECO) method. Finally a parametric study is used to show effect of ambient temperature on important energy, exergy and exergoeconomic parameters of the CHP system. Also effects of change in compressor pressure ratio and turbine inlet temperature on these parameters are investigated in different environment temperatures. The results show that increasing ambient temperature increases the work output, heating power and exergoeconomic factor and decreases the exergetic efficiency and cost of exergy destruction. Increasing compressor pressure ratio leads to increase in the work output, heating power, exergetic efficiency, and exergy destruction cost and exergoeconomic factor of the CHP system in all environment temperatures. Also increasing turbine inlet temperature decreases the work output, exergetic efficiency and exergoeconomic factor while increases the heating power as well as exergy destruction cost in all environment temperatures.


Keywords    Energy, exergy, exergoeconomics, SPECO, Diesel engine, CHP


چکیده    این مقاله تحلیل اگزرژی، اگزرژواکونومیک و بررسی پارامتری یک سیستم تولید همزمان برق و حرارت بر پایه موتور دیزل را که kW 277 برق و kW 282 گرما تولید می­کند ارائه می­نماید. بدین منظور ابتدا تحلیل ترمودینامیکی سیستم تولید همزمان بر پایه انرژی و اگزرژی انجام شده است. سپس تعادل هزینه و معادلات کمکی برای هر یک از اجزا نوشته شده­اند. تحلیل اگزرژواکونومیک بر پایه روش هزینه­دهی به اگزرژی ویژه انجام شده است. در نهایت یک مطالعه پارامتری به منظور نشان دادن اثر تغییر دمای محیط بر پارامترهای مهم انرژی، اگزرژی و اگزرژواکونومیک سیستم انجام شده است. همچنین تاثیر تغییرات نسبت فشار کمپرسور و دمای ورودی توربین در دماهای مختلف محیط بر این پارامترها بررسی شده است. نتایج مطالعه نشان می­دهد که افزایش دمای محیط باعث افزایش کار و گرمای خروجی و ضریب اگزرژواکونومیک شده و بازده اگزرژی و هزینه تخریب اگزرژی را کاهش می­دهد. افزایش نسبت فشار کمپرسور منجر به افزایش کار و گرمای خروجی، بازده اگزرژی، هزینه تخریب اگزرژی و ضریب اگزرژواکونومیک سیستم تولید همزمان در همه دماهای محیط می­شود. همچنین افزایش دمای ورودی توربین باعث کاهش کار خروجی، بازده اگزرژی و ضریب اگزرژواکونومیک می­شود در حالیکه گرمای خروجی و هزینه تخریب اگزرژی را در همه دماها افزایش می­دهد.


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