تحلیل اگزرژی-اقتصادی و مقایسه سیکل‌های سرمایشی جذبی خورشیدی با سیال عامل‌های آب-آمونیاک و آمونیاک-نمک
محورهای موضوعی : Mechanical Engineeringریحانه ربیعی 1 , مهدی برجی 2 , آدمین کاظمی 3
1 - گروه مهندسی مکانیک، واحد بندرانزلی، دانشگاه آزاد اسلامی، بندرانزلی، ایران
2 - گروه مهندسی مکانیک، واحد لاهیجان، دانشگاه آزاد اسلامی، لاهیجان، ایران
3 - گروه مهندسی مکانیک، واحد بندرانزلی، دانشگاه آزاد اسلامی، بندرانزلی، ایران
کلید واژه: تحلیل اگزرژی-اقتصادی, سیکل جذبی, کلکتور خورشیدی, آب-آمونیاک, آمونیاک-نمک,
چکیده مقاله :
این پژوهش، عملکرداگزرژی و اگزرژی-اقتصادی شش پیکره بندی چیلر را برای تولید 300 کیلوات سرمایش مورد تحلیل و مقایسه قرار می‌دهد. پیکره‌بندی‌های مورد بررسی شامل سیکل سرمایشی جذبی ساده و سیکل سرمایشی ترکیبی جذبی-اجکتوری با استفاده از سیال عامل های آب-آمونیاک، آمونیاک-لیتیم نیترات و آمونیاک-سدیم تیوسیانات با محرک کلکتور خورشیدی صفحه تخت و تانک ذخیره است. هدف پژوهش حاضر این است که تعیین کند کدام یک از سیالات عامل بر مبنای آمونیاک عملکرد بهتری در این سیکل‌های سرمایشی دارند. نتایج نشان داد که با افزایش دمای ژنراتور در سیکل های جذبی و همچنین با افزایش نسبت فشار اجکتور در سیکل ترکیبی جذبی-اجکتوری با سیال عامل آمونیاک-سدیم تیوسیانات، فاکتورهای خورشیدی و اقتصادی در سیکل های مذکور بهبود پیدا می کند در مقایسه با این دو سیکل با سیال عامل های آب-آمونیاک و آمونیاک-لیتیم نیترات به خصوص در دماهای بالای ژنراتور. در ارتباط با هزینه واحد تولید برودت، سیکل های مورد مطالعه با سیال عامل آمونیاک-لیتیم نیترات عملکرد بهتری را نشان می دهند.
This research analyzes and compares the exergy and exergoeconomic performance of six chiller configurations to produce 300 Kw of cooling. The configurations are the simple absorption and the combined ejector-absorption refrigeration cycles using ammonia-water (NH3-H2O), ammonia-lithium nitrate (NH3-LiNO3) and ammonia-sodium thiocyanate (NH3-NaSCN) driven by flat plate solar collector and storage tank. The objective of this research is to determine which ammonia-based working fluids provide superior performance in solar absorption cooling systems. The results show that with an increase of the generator temperature in the absorption cycles, as well as with an increase of the ejector pressure ratio in the combined ejector-absorption cycle with NH3-NaSCN as working fluid, the solar and economic factors improve, especially at higher generator temperatures compared to these cycles with NH3-LiNO3 and NH3-H2O as working fluids. Regarding the unit cost of cooling production, the studied cycles with NH3-LiNO3 show a better performance.
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