طراحی و ارزیابی چرخه ترکیبی جدید توان و تبرید با دو تبخیرکننده، با استفاده از سیال کاری زئوتروپیک

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مکانیک دانشگاه محقق اردبیلی

2 محقق اردبیلی-فنی و مهندسی- مهندسی مکانیک

چکیده

در این مطالعه، یک چرخه ترکیبی جدید همراه با دو تبخیرکننده مبتنی بر چرخه رانکین دو مرحله‌ای و چرخه تبرید اجکتوری به منظور بازیابی گرمای اتلافی موتور دیزل دریایی و تولید همزمان توان و سرمایش در کشتی‌ها ارائه شده است. به جای استفاده از سیالات کاری معمولی، از مخلوط‌های زئوتروپیک به عنوان سیال کاری در این سیستم استفاده شده و نتایج از دیدگاه قانون‌های اول و دوم ترمودینامیک مورد بحث قرار گرفته است. نتایج نشان می‌دهد که با در دست داشتنkW  434 انرژی از طریق بازیافت گاز‌های خروجی و استفاده از مخلوط دو سیال R142b و پنتان با کسر جرمی 51 به 49 درصد منجر به دستیابی به حداکثر بازده انرژی % 28/43 و ظرفیت تبریدkW  36/166 می‌شود. همچنین در این حالت توان خالص تولیدی و بازده اگزرژی به ترتیب kW 83/21 و % 22/20 حاصل می‌شود؛ که با انتخاب مخلوط‌های مناسب دیگر، می‌توان به مقادیر بیشتری از توان تولیدی و بازده اگزرژی دست یافت. علاوه براین مشخص شده که ژنراتور بخار کمکی دارای بیشترین آهنگ تخریب اگزرژی بوده به طوری کهkW  3/62 از کل تخریب اگزرژی kW 15/122 را به خود اختصاص داده است. همچنین بازده انرژی و اگزرژی سیستم را می‌توان با افزایش دمای نقطه حباب تبخیرکننده 1 به طور همزمان افزایش داد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Design and evaluation of a novel bi-evaporator combined power and refrigeration cycle working with various zeotropic mixtures

نویسندگان [English]

  • Milad Fili 1
  • Hadi Ghaebi 2
  • Hadi Rostamzadeh 1
1 Mechanical Engineering Department
2 محقق اردبیلی-فنی و مهندسی- مهندسی مکانیک
چکیده [English]

 In the present research, a novel bi-evaporator combined cooling and power cycle based on the integration of a double-stage organic Rankine cycle and an ejector refrigeration cycle is devised to recycle heat from the exhaust gas of a marine diesel engine. Instead of using conventional pure organic fluids, various appropriate zeotropic mixtures are screened for the proposed system and the results are discussed in terms of the first and second laws of thermodynamics. The results indicated that by recycling 434kW energy from the exhaust gases and using R142/Pentane with 51/49 percent a maximum thermal efficiency of 43.28% and an overall cooling load of 166.36 kW can be achieved. In this case, the net produced electricity and exergy efficiency are obtained as 21.83 kW and 20.22% which can be increased by selecting other appropriate mixtures. Additionally, using R142/Pentane with 51/49 percent as the working mixture, it is figured out that the auxiliary vapor generator contributes to the highest exergy destruction by 62.3 kW out of overall exergy destruction of 122.15 kW. Also, the energy and exergy efficiencies of the system can be increased simultaneously by increasing the evaporator bubble point temperature.

کلیدواژه‌ها [English]

  • Waste heat
  • Marine diesel engine
  • Ejector
  • Bi-evaporator
  • Zeotropic mixture

مراجع

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نشریه مهندسی مکانیک امیرکبیر
دوره 53، شماره 5
مرداد 1400
صفحه 3003-3022

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