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Three-Dimensional Numerical Simulation and Performance Analysis of Plate-Type Indirect Evaporative C

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Tutor: YuQingBo
School: Northeastern University
Course: Refrigeration and Cryogenic Engineering
Keywords: condensation dehumidification,indirect evaporative cooling,mathematicalmodel,Cou
CLC: TU831.4
Type: Master's thesis
Year:  2011
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Abstract:
Indirect evaporative cooler in plate heat exchanger is a evaporative cooling method, in which a secondary air cooling and the primary air condensation caused by evaporation of wa-ter are controlled in the two channels.This paper simplified the model of indirect evaporative cooler through the study on the heat and mass transfer features in the process of condensation dehumidification. Three-dimensional mathematical model is established through the CFD method. The three-dimensional mathematical model is divided into discrete grids by the pre-processor software Gambit. Through the first indirect evaporative cooler for cooling dehumidification air channel situation, this paper defines the boundaries of heat and mass transfer coupling, and compiled a user-defined procedures. The process of coupled heat and mass transfer is solved by Fluent in the state of parameters given. The results of numerical simulation are disposed by post-processing software origin in this paper. The first and second air channel pressure, veloc-ity, temperature and water vapor concentration distribution are acquired too in this paper. This paper also analyses the impact of external parameters on condensation dehumidification in indirect evaporative cooler.This paper analyses energy and useful energy conversion and losses in the process of condensation dehumidification in the indirect evaporative cooler. Through the features of benefit exergy and cost exergy, this paper defines the calculation expression of exergy effi-ciency. On the basic of the expression, through some basic thermodynamic indicators, such as heat transfer efficiency, exergy efficiency, improve the degree of thermodynamics, exergy loss rate, exergy loss coefficient of indirect evaporative cooling and dehumidification process en-ergy to useful energy use, losses are analyzed and studied. The results of simulation and the thermal performance analysis indicate that the structural parameters of the indirect evapora-tive cooler and inlet air cooling dehumidification parameters are caused when the effect of heat transfer, and that utilization of useful energy can be also changed. The analysis results can provide a theoretical basis for optimal design.
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