کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
646220 1457161 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Thermodynamic analysis of ammonia-water power/chilling cogeneration cycle with low-grade waste heat
ترجمه فارسی عنوان
تجزیه و تحلیل ترمودینامیکی چرخه تولید کربن با قدرت آمونیاک / آب خنک با حرارت ضعیف کم
کلمات کلیدی
آمونیاک، آب، چرخه تولید انرژی، گردش چندگانه، غلظت محلول، عملکرد حرارتی،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
An ammonia-water absorption cycle for power and chilling output cogeneration from mid/low-grade waste heat was analyzed and optimized, which is a modified Kalina cycle adding an evaporator and a subcooler to realize the chilling effect. The cycle achieves higher efficiency by generating chilling output from proper internal recuperation process without consumption of additional heat resource and by realizing heat transfer with suitable ammonia concentrations for variable phase change processes to match both heat source and cooling water. Analysis of the impact of key parameters for the system on the thermal and exergy efficiencies was carried out. The results show that there are matching basic and work concentration pairs for a higher efficiency. The smaller circulation multiple and greater chilling fraction are favorable to the efficiencies but restricted respectively by heat transfer constraint of recuperator and the demand. The calculation example with the turbine inlet parameters set at 195 °C/2.736 MPa and the cooling water inlet temperature set at 25 °C with chilling fraction of 0.5 shows that the thermal efficiency and exergy efficiency reach up to 16.4% and 48.3%, about 24.24% and 8.16% higher than those of an ammonia-water power cycle under identical condition.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Thermal Engineering - Volume 64, Issues 1–2, March 2014, Pages 483-490
نویسندگان
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