兼顾冬夏工况的热源塔换热性能研究

论文总字数：29167字

摘 要

在冬季，提高溶液流量、进口空气含湿量，有利于总换热量，但潜热百分比增加，会导致溶液浓度降低；在保证总换热量下，可适当提高风量以及进口空气温度，有利于热泵系统的安全运行；提高溶液温度，可降低潜热百分比，但换热量降低。在夏季，提高进口溶液温度、风量以及溶液流量，有利于系统的换热；在保证空气相对湿度为60%-70%，降低进口空气温度、空气含湿量，有利于系统换热。

关键词：数学模型；模拟仿真；传热性能的影响；优化方案

Study on heat transfer performance of the heat source tower in winter and summer’s operating conditions

03111630 Yingfa Fang

Supervised by Name:Caihua Liang

Abstract： In this paper, the heat and mass exchange processes of the opening source tower are analyzed in winter and summer. At the basis of that, the transferring heat and mass model of the heat source tower is established. In order to justify the established mathematical model, the opening source tower modular simulation of the hotel will be established via Visual Basic language to calculate the solution and air’s outlet situation, which will be compared with the experimental values. After justifying the mathematical model, the modular simulation which has been respectively set up in the winter and summer would help to explore the transferring heat influences of the differently operating condition and put forward to the optimal schemes.

In winter, improvement of the solution flow rate, increasing the humidity of inlet air is conducive to the total transferring heat, while the increasing of the latent heat percentage will lead to the decreasing of the density of the solution; Under the circumstance of ensuring the total transferring heat, the appropriately increasing air flow rate and the inlet air temperature will be conducive to safely operate for the heat pump system; Enhancing temperature of the solution will lead to reduce the percentage of latent heat, but decrease the total transferring heat. In the summer, improving the inlet solution temperature, air flow rate and the flow of the solution will be advisable to exchange heat for the system; Under the circumstance which ensures the air relative humidity is 60% - 70%, reducing the inlet air temperature and decreasing humidity of air will be conducive to exchange heat for the system.

Keywords: mathematical model; modular simulation; the transferring heat influences; the optimal schemes

目录

1、绪论 1

1.1研究背景 1

1.2热源塔国内研究状况 2

1.3研究意义及目的 3

1.4研究内容 3

2、热源塔工作原理及运行介质 4

2.1热源塔结构特点及工作原理 4

2.1.1开式热源塔结构特点 4

2.1.2工作原理 4

2.2开式热源塔工作介质 5

2.3本章总结 6

3、逆流开式热源塔内部热质交换过程分析 7

3.1热源塔内部液体与空气交换模型 7

3.2夏季逆流开式热源塔的热质交换分析 7

3.3冬季开式逆流热源塔热质交换过程分析 9

3.4本章总结 11

4、逆流开式热源塔模型建立及模型验证 12

4.1逆流开式热源塔物理模型建立 12

4.2逆流开式热源塔数学模型 12

4.3逆流开式热源塔数学模型运用 14

4.3.1 填料区微元 14

4.3.2建立微元段热质交换方程组 14

4.4数学模型验证 15

4.4.1模型中参数的确定 15

4.4.2对数学模型建立模拟 16

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