4260

4031

كارشناسي ارشد

تبديل انرژي

اصفهان : دانشگاه صنعتي اصفهان، دانشكده مكانيك

1387

سيزده، 151،[II] ص. : مصور، جدول، نمودار

ص. ع. به: فارسي و انگليسي

احمد رضا عظيميان،احمد صداقت

علي اكبر عالم رجبي

23/7/1387

احمد صابونچي، محمد رضا سليم پور

مهندسي مكانيك

ID4031

به فارسي و انگليسي: قابل رويت در نسخه ديجيتال

AbstractTo study plate heat exchangers the configuration is one of the most important parameter on theheat exchanger efficiency One of the advantages of the plate heat exchangers are ability to fitproperly with any process types There are variety of configurations that can satisfy therequirements of precise heat transfer and desired outlet temperature Since the gaps between platesin the plate heat exchanger are very small The flow is turbulent even at very low Reynoldsnumbers The parameters that define the configuration of the plate heat exchangers include numberof channels number of passes at each side fluid location feed connection relative location andtype of flow in the channels By changing these parameters one may create differentconfigurations such as series and parallel current and countercurrent flows and etc In this project three types of corrugated plate heat exchangers and various configurations with 24channels were investigated computationally using Fluent Different parameters and modeling wereexamined on performance of the heat exchanger The RANs equations together with the standard k turbulence equations were solved using a Finite Volume technique that employed inFluent Results of simulations show that the heat exchanger performances are improved by increasing thenumber of passes and number of channels for the countercurrent flow However in this case allconfigurations have not enhanced equally the performance of the heat exchanger This means thatboth the parameters need to be increased Simultaneity to increase performance For similarconfiguration a countercurrent flow in entrance performs better heat transfer than a current flowconfiguration Moreover the effect of the second fluid is more important than the number ofpassage in same cases The number of passage may increase heat transfer and flow rate howeverpressure loss will also increase Furthermore the flow rate cannot be distributed equally in thesepassages Finally it is also observed that the heat exchangers with vertical flows perform less thensimilar configurations with cross flows

احمد رضا عظيميان،احمد صداقت

علي اكبر عالم رجبي

احمد صابونچي، محمد رضا سليم پور