کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
662530 | 1458177 | 2006 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Development of generalized (rate dependent) availability
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
We treat the irreversible extension of the classical problem of maximum mechanical work that may be obtained from a system composed of: a resource fluid at flow, a set of sequentially arranged engines, and an infinite bath. In the engine mode the fluid's temperature T decreases along the path, thus tending to the bath temperature Te, and the system delivers work. In a related classical problem the process rates vanish due to the reversibility; here, however, finite rates and consistent losses of the work potential are admitted. The variational calculus leads to a finite-rate generalization of the maximum-work potential called the finite-rate exergy. This finite-rate exergy is a function of the usual thermal coordinates and the overall number of transfer units Ï or a rate index h, which is, in fact the Hamiltonian of optimal, active (energy-generating) relaxation process to equilibrium. The resulting bounds on the work delivered or supplied are stronger than the classical reversible bounds.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 49, Issues 3â4, February 2006, Pages 789-795
Journal: International Journal of Heat and Mass Transfer - Volume 49, Issues 3â4, February 2006, Pages 789-795
نویسندگان
Stanislaw Sieniutycz,