The enhancement and optimization of heat transfer are essential for energy conservation and environment protection, because heat transfer is related to almost % of total energy consumption in industry. Convective heat transfer is one of the common transport processes in industry. It is highly important to develop a theory and corresponding technology for enhancing convective heat transfer. Through numerical simulation and experimental analysis, researchers have developed many technologies to enhance the heat transfer in tube flow. Correspondingly, certain heat-transfer-enhanced tubes are exploited, such as inner-finned tubes [], spiral corrugated tubes [], and micro-finned tubes []. Bejan et al. [] divided the tube flow into two parts: boundary flow and core flow. The flow near the wall of tube is defined as boundary flow and the remaining is core flow. In the aforementioned heat-transfer-enhanced tubes, the surfaces in the boundary, which dominate the convective heat transfer between fluid and tube wall, are designed or improved to enhance heat transfer. The mechanism for heat transfer enhancement includes []: disturbing the boundary layer, extending the heat transfer surface, and changing the physical properties of the heat transfer surface. Therefore, this kind of method can be designated as surface-based heat transfer enhancement (abbreviated as the surface-based method). This method effectively enhances the convective heat transfer coefficient, but the increase in flow resistance may become significant and the comprehensive performance can be weakened.

این نشریه ی دارای دسترسی باز، تحت قوانین گواهینامه بین‌المللی Creative Commons Attribution . International License منتشر می‌شود که اجازه اشتراک (تکثیر و بازآرایی محتوا به هر شکل) و انطباق (بازترکیب، تغییر شکل و بازسازی بر اساس محتوا) را می‌دهد.

تبصره: در صورتیکه امکان اشغال فضای سبز به میزان درصد وجود نداشت، می‌توان حدأکثر درصد از فضای سبز را در خارج از قطعه زمین تخصیصی احداث کرد. البته کار باید با هماهنگی شرکت است..انی در مشاعات شهرک / ناحیه صنعتی و منطقه ویژه اقتصادی مربوطه انجام شود.

In this study, the equilibrium equation of available potential, which reveals the relation of available potential and local exergy destruction rate, is determined, and the expressions of available potential and local exergy destruction rate are given. To improve heat transfer enhancement and reduce increase amplitude of flow resistance, a method termed as fluid-based heat transfer enhancement is proposed relative to surface-based heat transfer enhancement. An optimal mathematical model by constructing Lagrange function with exergy destruction corresponding to irreversibility loss of heat transfer process and fluid power consumption to flow loss of fluid is adopted to validate this method. To obtain the optimal flow structure in a tube, the tube flow is divided into two parts: core flow and boundary flow. For reducing the irreversibility loss in the core flow, we take fluid exergy destruction as optimization objective with prescribed fluid power consumption. For reducing the flow resistance in the boundary flow, we take fluid power consumption as optimization objective with prescribed fluid exergy destruction. The optimization equations for the convective heat transfer in laminar flow are derived, which are solved numerically. The longitudinal swirling flows in the tube are found at different parameters. In the optimized flow, heat transfer is enhanced greatly while accompanied with a little increase of flow resistance. Comprehensive performance, the ratio of increases in heat transfer and flow resistance, reaches at . after optimization.

در صورتیکه که جایی برای طراحی و اجرای مسیرهای پیاده روی عمومی در نظر گرفته می شود و این مسیر پیاده روی عمومی بخشی از مسیر خیابان های عمومی نیست، توسعه صنعتی مجاور نباید به گونه‌ای باشد که زیبایی و ایمنی مسیرهای پیاده‌روی را کاهش دهد.