heat exchangers in a c3mr lng plant, cooling curves and their effects on efficiency
نویسندگان
چکیده
in this paper, we are going to improve the energy efficiency of an industrial c 3 mr base load lng plant by changing its refrigerant components and its mole fractions in liquefaction and subcooling cycles based on the cooling curves generated in the main liquefaction and subcooling heat exchangers. later on, selection features of the elements will be discussed. first, non-optimized c 3 mr plant models and the obtained cooling curves reveals. the process is modeled by using the hysys ® software. the prsv equation of state is used for thermodynamics properties calculations both for the natural gas and the refrigerants. two methods for modeling and optimization are explained and the results are compared. the first optimization method is done by a try and error method, which uses temperature vs. enthalpy diagrams or thermodynamics second law (exergy loss). this method is based on decreasing the temperature difference between hot and cold streams. in the second method, optimizer of hysys ® is used. in this method, a random mole fraction suggests by optimizer at each step and the plant’s consumption work calculates. by comparing the obtained consumption’works and choosing the least one, the relative mole fractions determines as the optimized refrigerants. the convergence of results of method 1 and 2 (the mole fractions of liquefaction and subcooling refrigerants) proves the accuracy of these methods and the models and primary predictions. the results show that by optimization of mixed refrigerants, it is possible to decrease the energy demand about 10.4 mw (5.36 %).
منابع مشابه
on translation of politeness strategies in dialogues involving female characters in translations and retranslations of novels translated before and after the islamic revolution of iran and their effects on the image of women: a polysystem theory approach
abstract reception environment has considerable effects on accepting a translation. as the expectations of a target culture and its values and needs change throughout history, its criteria for accepting a translation or rejecting it will change accordingly (gentzler, 2001). the expectations of iran, as the reception environment in the present study, have changed after the islamic revolution. i...
in translation: translators on their work and what it means
کتاب در باب ترجمه، اثر استر آلن و سوزان برنوفسکی منتشر شده در ماه می 2013 توسط نشریه کلمبیا است. نویسندگان در این کتاب به بررسی 18 مترجم با در نظر گرفتن نقش آثاری که این مترجمان ترجمه کرده اند میپردازند. کتاب به دو بخش تقسیم میشود: " مترجم در جهان" و " کار مترجم" این دو بخش مقالات همیشگی ترجمه و موقعیت خاص ادبیات بیگانه در جهان وسیع امروزی را مورد خطاب قرار میدهد. در این کتاب مقالات متعددی از ن...
Experimental study of nanofluid effects on heat transfer in closed cycle system in shell and tube heat exchangers at Isfahan power plant
The present study investigated the effect of distilled-water/ silver nanofluid on heat transfer in a closed cooling system of one of the electrical energy generation units at Isfahan power plant. The difference between this study and previous researches refers to silver properties which have a high thermal conductivity and is non-toxic, hydrophilic and eco-friendly. Distilled water/ silver ...
متن کاملExperimental study of nanofluid effects on heat transfer in closed cycle system in shell and tube heat exchangers at Isfahan power plant
The present study investigated the effect of distilled-water/ silver nanofluid on heat transfer in a closed cooling system of one of the electrical energy generation units at Isfahan power plant. The difference between this study and previous researches refers to silver properties which have a high thermal conductivity and is non-toxic, hydrophilic and eco-friendly. Distilled water/ silver ...
متن کاملEfficiency of airway heat and moisture exchangers in anesthetized humans.
The efficiencies of airway heat and moisture exchanging filters in reducing respiratory water losses and increasing airway temperatures during general anesthesia were studied in five tracheally intubated patients given isoflurane, nitrous oxide, and oxygen anesthesia during controlled ventilation. Filters (Humid-Vent Filter, Humid-Vent 1, Pall Conserve, Siemens 150, and ThermoVent 600) were pla...
متن کاملمنابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
international journal of advanced design and manufacturing technologyجلد ۳، شماره ۳، صفحات ۱-۶
میزبانی شده توسط پلتفرم ابری doprax.com
copyright © 2015-2023