مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

تحلیل عملکرد و بهینه‌سازی سیستم سه‌هدفه با استفاده از مفاهیم ترمودینامیک زمان محدود

نویسندگان
امیر قاسم خانی 1
سعید فراهت 2
محمد مهدی ناصریان 3
1 دانشگاه سیستان و بلوچستان و استاد دانشگاه چمران کرمان
2 دانشگاه سیستان وبلوچستان
3 دانشگاه سیستان و بلوچستان
چکیده
در این مقاله، به تحلیل عملکرد و بهینه‌ سازی یک سیستم سه‌هدفه بر‌اساس معیارهای متفاوت ترمودینامیکی مانند بازده انرژی و اگزرژی، توان و توان بی‌بعد پرداخته شده است. سیستم سه‌هدفه از سه زیرسیستم تشکیل ‌شده است که شامل زیرسیستم خورشیدی، زیرسیستم کالینا و زیرسیستم چیلر جذبی لیتیم برمید - آب است. هدف این سیستم تولید توان، آب گرم خانگی و سرمایش با استفاده از انرژی خورشید است. توان بی‌بعد، به ‌عنوان یک ابزار برای درک مفاهیم ترمودینامیک زمان محدود معرفی ‌شده است. توان بی‌بعد به‌ صورت نسبت توان به حاصل‌ضرب هدایت حرارتی کل در دمای کمینه سیکل خورشیدی تعریف ‌شده است. تحلیل اگزرژی نشان داده است که بیشترین اگزرژی تخریب‌شده مربوط به بویلر است. نتایج نشان داده است که در طراحی اولیه بازده انرژی، بازده اگزرژی، نرخ هزینه سرمایه‌گذاری کل و توان بی‌بعد به ترتیب برابر است با%37/17، %82/18، 63/9 دلار بر ساعت و 01781/0. تحلیل حساسیت نشان داده است که افزایش پارامترهایی مانند دمای محیط، تابش خورشیدی، دمای ورودی کلکتور و نسبت فشار سیکل کالینا باعث افزایش بازده انرژی و اگزرژی شده است. همچنین افزایش نسبت فشار سیکل کالینا، کاهش دبی جرمی سیکل کالینا، دمای محیط و دمای ورودی کلکتور باعث افزایش توان بی‌بعد شده است. علاوه بر این به مقایسه معیارهای بهینه‌ سازی مانند بازده انرژی، بازده اگزرژی، توان و توان بی‌بعد پرداخته شده است. نتایج نشان داده است که توان و توان بی‌بعد بهترین معیار بهینه‌ سازی ترمودینامیکی هستند.
کلیدواژه‌ها
تحلیل اگزرژی
سیکل کالینا
ترمودینامیک زمان محدود

عنوان مقاله English

Performance analysis and optimization Tri-Generation system using Finite-Time Thermodynamics concepts

نویسندگان English

Amir Ghasemkhani 1
Said Farahat 2
Mohammad Mahdi Naserian 3
1 Department of Mechanical Engineering, Faculty of Engineering, University of Sistan and Bluchestan, Zahedan, Iran
2 Mechanical Engineering DepartmentUniversity of Sistan and Baluchestan987-98155, Zahedan, Iran.
3 Department of Mechanical Engineering, Faculty of Engineering, University of Sistan and Bluchestan, Zahedan, Iran
چکیده English

In this paper, performance analysis and optimization of a trigeneration system based on different thermodynamic criteria such as energy and exergy efficiency, power and dimensionless power have been investigated. The trigeneration system consists of three subsystems which including the solar subsystem, Kalina subsystem and lithium bromide-water absorption chiller subsystem. The proposed system uses solar energy generates power, cooling and domestic water heating. Power is introduced as a tool for understanding thermodynamic concepts of limited time. Dimensionless power is defined as the ratio of power to the product of total thermal conductivity and minimum temperature of the system. Dimensionless power can be used as a tool to understand the concepts of finite time thermodynamics. The exergy analysis has shown that the most exergy destruction is related to boiler. As a result, energy and exergy efficiencies, capital cost rates and dimensionless power are 17.77%, 18.82% and 9.63 dollars per hour, 0.01781 respectively. Sensitivity analysis has shown that increasing parameters such as ambient temperature, solar radiation, the dimensionless mass flow rate of the Kalina cycle, collector inlet temperature and pressure ratio of the Kalina cycle increase energy and exergy efficiencies. Also increasing pressure ratio the of Kalina Cycle, reducing the dimensionless mass flow rate of the Kalina cycle, the ambient temperature and collector inlet temperature has led to increased dimensional power. In addition, the optimization criteria such as energy efficiency, exergy efficiency, power and dimensional power have been compared. The results showed that power and dimensional power are the best thermodynamic optimization criteria.

کلیدواژه‌ها English

Exergy analysis
Kalina cycle
Finite-Time Thermodynamics
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مهندسی مکانیک مدرس
دوره 18، شماره 2
اردیبهشت 1397
صفحه 61-72