کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6680232 1428068 2018 20 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Thermodynamic analysis of hybrid Rankine cycles using multiple heat sources of different temperatures
ترجمه فارسی عنوان
تجزیه و تحلیل ترمودینامیکی چرخه های رنکین هیبریدی با استفاده از منابع حرارت چندگانه با دمای های مختلف
کلمات کلیدی
چرخه قدرت حرارتی ترکیبی، منابع گرمای چندگانه با دمای متفاوت، تجزیه و تحلیل ترمودینامیکی، شبیه سازی سیستم های قدرت، رکین قدرت چرخه،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی مهندسی انرژی و فناوری های برق
چکیده انگلیسی
Past studies of hybrid power cycles using multiple heat sources of different temperatures focused mainly on case studies and almost no general theory about this type of systems was developed. This paper is a first comprehensive study of their general thermodynamic performance, with their comparison to their corresponding single temperature heat source reference system, focusing on three types of power cycles: simple Rankine cycle, Rankine cycle with reheat and Rankine cycle with heat regeneration. The generalized expressions for the energy and exergy efficiency differences between the hybrid and the corresponding single heat source system were developed. A number of simulation case studies were performed to help the understanding and confirm the thermodynamic generalization of the results. The results show that the energy and exergy efficiencies of the hybrid systems are higher than those of their corresponding single heat source reference systems if and only if the energy andexergy conversion efficiency (defined in the paper) of the additional heat source (AHS) is larger than that of the original heat source. The conditions that defined the effects of the AHS temperature and heat addition rate on the energy and exergy efficiencies of the hybrid systems as convex or concave curves were described. Comparisons across the first two types of hybrid power cycles were made, showing that the energy and exergy efficiencies of the reheat Rankine cycle is generally higher than that of the simple Rankine cycle as AHS is changed. Recommendations were made for obtaining the maximal energy and exergy efficiency as a function of the AHS temperature, of the heat addition rate by the AHS, and of the AHS position in the power cycle flow sheet. For the hybrid power generation systems with heat regeneration it was found that when using an AHS to raise the net system power by a given amount, using it to replace the higher-pressure extracted steam will result in a higher system energy efficiency than when using it to replace lower-pressure extracted steam. Hybrid cycles can have significantly lower emissions, cost, and fuel depletion.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Energy - Volume 222, 15 July 2018, Pages 564-583
نویسندگان
, ,