شبیه‌سازی سیکل جذبی پخشی با منبع حرارتی اگزوز خودرو و بهبود عملکرد در دورهای پایین موتور

نوع مقاله : مقاله پژوهشی

نویسندگان

1 صنعتی خواجه نصیرالدین طوسی

2 دانشگاه صنعتی خواجه نصیر الدین طوسی

چکیده

در این پژوهش یک سیکل تبرید جذبی پخشی برای استفاده در خودرو شبیه‌سازی شده است که از انرژی حرارتی اتلافی اگزوز به عنوان منبع انرژی حرارتی سیکل استفاده گردیده است. موتور احتراق داخلی با حجم 1/3 لیتر در دورهای موتور و میزان بازشدگی‌های مختلف دریچه گاز مورد تست تجربی قرار گرفت و از شرایط دود اگزوز نظیر دبی و دما به عنوان ورودی منبع حرارتی سیکل تبرید استفاده شد. در نهایت، برای دورهای موتور بالاتر از 2000 rpm مشکل خاصی وجود نداشت و دمای اواپراتور بین -0/4 oC الی -7/1 oC قرار گرفت ولی برای دورهای 1500 rpm و 1000 rpm ، دمای اواپراتور در محدوده مناسبی قرار نگرفت که این مشکل در پژوهش های پیشین نیز گزارش شده است. تا کنون راه کاری برای دورهای پایین یا شرایط بیکار موتور مثلا در ترافیک ارایه نشده است. در این مطالعه، ژنراتور جدیدی طراحی و مورد شبیه­سازی قرار گرفت. استفاده از ژنراتور جایگزین به طور میانگین16/8 % انتقال حرارت به ژنراتور را بهبود بخشید که بر اثر آن ظرفیت سرمایشی به طور میانگین4/7% افزایش پیدا کرد. سیکل جذبی پخشی کنونی قادر است در دورهای پایین موتور نیز عملکرد مناسبی ارائه دهد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Simulation of diffusion absorption refrigeration cycle with car exhaust heat source and improving cycle performance at low engine speeds

نویسندگان [English]

  • Majid Bazargan 1
  • ramin farzadi 2
2 K.N.Toosi university of technology
چکیده [English]

A diffusion absorption refrigeration cycle as a car refrigerator, which uses the car exhaust waste heat as a heat source of the cycle has been simulated in this study. An internal combustion engine with a volume of 1.3 liters at different engine speeds and throttle openings was examined experimentally and exhaust conditions such as flow rate and temperature were used as the input of the cycle. For engine speeds above 2000 rpm, there was no trouble and the evaporator temperature ranged from -0.4oC to -7.1oC. For 1500 rpm and 1000 rpm, the evaporator temperature did not reach the desired range of variations, which is the case in other reported researches. There is no available solution for the situations where the engine is running at low speed such as in traffic jam or idle condition. Therefore, a new generator was designed and simulated to solve this problem. The simulation results show that by using the modified generator, the heat transfer to the generator improves by 16.8% on average. Consequently, the cooling capacity increases by 4.7%. Therefore, the current diffusion absorption cycle is capable of performing well at the low engine speeds.

کلیدواژه‌ها [English]

  • Diffusion Absorption Refrigeration cycle
  • Internal combustion engine
  • Exhaust wasted heat
  • Cooling Capacity
  • Car refrigerator
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