Prijenos topline i mase u izmjenjivaču topline

Zadravec, Danijel (2017) Prijenos topline i mase u izmjenjivaču topline. = Heat and mass transfer in heat exchanger. Undergraduate thesis , Sveučilište u Zagrebu, Fakultet strojarstva i brodogradnje, UNSPECIFIED. Mentor: Ferdelji, Nenad.

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Abstract (Croatian)

U radu je proveden termodinamički proračun odvlaživanja vlažnog zraka – rashladnom vodom u „Shell & Tube“ izmjenjivaču zadane geometrije. Proračun se temelji na istovremenom konvektivnom prijenosu topline i mase uslijed rošenja vlage iz zraka. Matematički model proračuna postavljen je na diskretizirane kontrolne volumene koji čine pojednostavljeni geometrijski model izmjenjivača. Rješavanjem modela dobivena su izlazna stanja obiju struja na svakom kontrolnom volumenu, čime je, osim učina izmjenjivača, određen tijek promjene stanja vlažnog zraka u Mollierovom h,x dijagramu u procesu odvlaživanja. Uspoređeni su rezultati za istosmjernu i protusmjernu izvedbu izmjenjivača te je analiziran utjecaj vlažnosti i temperature ulaznog zraka na učin izmjenjivača i količinu izlučenog kondenzata. Na kraju su kvantificirana odstupanja rezultata zbog uvedene pretpostavke o malim brzinama prijenosa mase čime su dane smjernice za širu primjenu danog modela.

Abstract

This paper describes a thermodynamic analysis of humid air dehumidification with cooling water in shell and tube heat exchanger of given geometry. The analysis is based on a simultaneous convective heat transfer and mass transfer due to the moisture condensing from the air. Mathematical calculation model is applied to the discretized control volumes which form a simplified geometrical model of the heat exchanger. By solving the model, thermodynamic states of both the fluids at the exit of every control volume are obtained, which, beside the overall heat transfer rate, determines the humid air process path in the Mollier h,x diagram. Results for parallel and counter flow heat exchanger are compared and the effect of inlet air temperature and humidity on the overall heat transfer rate and mass flow rate of condensed moisture is examined. Finally, deviation of results due to the low mass flux assumption are quantified which provides guidelines for broader application of given model.

Item Type:	Thesis (Undergraduate thesis)
Uncontrolled Keywords:	odvlaživanje zraka; prijenos topline i mase; rošenje
Keywords (Croatian):	air dehumidification; heat and mass transfer; condensation
Subjects:	TECHNICAL SCIENCE > Mechanical Engineering
Divisions:	300 Department of Thermodynamics, Thermal and Process Engineering > 310 Chair of Technical Thermodynamics
Date Deposited:	01 Mar 2017 10:27
Last Modified:	14 Mar 2017 16:03
URI:	http://repozitorij.fsb.hr/id/eprint/7493

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