大空间分层空调与上部通风即时耦合方法研究

VIP免费

3.0 牛悦 2024-11-19 4 4 6.78MB 99 页 15积分

侵权投诉

摘要

随着全球能源消耗的日趋紧张，以及人民生活水平的不断提高，空调室内热

环境的舒适性、健康性以及空调运行的节能性等问题已经成为人们关注的焦点。

分层空调作为节能技术之一，早已在大空间建筑中得到了应用和推广。在此基础

上，为进一步降低空调能耗，改善室内热环境，研究最大限度地利用室外自然冷

源便是本文的研究重点。本文提出的分层空调与上部通风即时耦合的思想是基于

下部分层空调与上部通风同时运行的思想，利用室外自然冷源通过上部通风带走

或部分带走非空调区域滞留的热量，以减少空调能耗，这一课题的提出及其论文

研究成果，将为大空间建筑分层空调的节能运行提供参考。

建筑空调能耗与室内负荷密切相关，为更好地研究大空间建筑空调降耗的方

法，本文首先以世博大空间实验基地建筑为研究对象，围绕大空间建筑分层空调

负荷以及热转移量随各种影响因素的变化特性进行了一系列的理论计算与分析，

并对采用的计算方法进行了讨论。

为全面反映分层空调与上部通风即时耦合对大空间建筑室内热环境的影响规

律，结合生态楼建筑室内空气温度分布、围护结构内壁面温度、自然通风量等热

环境参数的测定结果，分析了在分层空调时上部通风与否的两种工况下室内热环

境，验证了上部通风与分层空调结合改善室内热环境的有效性，为上部通风有效

利用的理论研究提供了实验依据。

本文采用数学建模的方法，建立大空间简易分区模型来分析上部通风对室内

热环境的影响。该模型基于多区热质平衡原理，建立室内空气热质平衡方程，并

考虑建筑上部开口和室内热源等因素的影响，对方程进行相应修正，同时联立非

空调区壁面导热、对流、辐射耦合换热方程，计算得到非空调区的室内空气平均

温度和围护结构内壁面温度。利用其解作为分层空调负荷的计算条件，从而获得

上部通风对空调负荷的影响，为分层空调与上部通风即时耦合方法的应用研究提

供基础。文章以生态楼建筑测试工况为依据，采用该模型计算了测试工况下非空

调区的室内空气平均温度和壁面温度，结果表明，计算值与实测值误差低于 5%。

因此大空间建筑在分层空调与上部通风即时耦合时，大空间简易分区模型用于预

测其室内热环境是有效可行的。

根据夏季分层空调与上部通风即时耦合运行方案的设计思想，本文提出并确

定了切换温度的概念和计算方法，并对生态楼建筑进行应用分析，确定其夏季设

计工况下即时耦合运行的温度切换点：下切换点温度为 tw=22.8℃，上切换点

tw=34.8℃。同时，对切换状态点的影响因素和系统运行的节能性进行分析，由计

算结果得出，分层空调+上部通风的耦合运行方案节能效果显著，对于本文的生

态楼建筑而言，其能量节约率平均约 21%，最大可达 48%，且随着室外温度的降

低而增加。夏季上部通风利用后，空调总节能量为 1.32 万kWh，如系统能效比平

均按 COP＝2.5 计算，节电约 0.53 万度。综合表明，上部通风的利用有着很大的

应用潜力，不仅有利于降低建筑能耗，实现较好的节能效果，同时也有助于提高

室内空气品质。

本文主要围绕大空间上部通风与分层空调系统耦合运行的应用展开研究，通

过现场实测分析、理论模型建立与即时耦合应用研究相结合的方法得出了耦合运

行切换点，验证了大空间建筑上部通风应用具有较大的节能潜力，这将为大空间

建筑分层空调的节能运行提供理论基础和研究方法，具有实际工程指导意义。

关键词：大空间建筑分层空调+上部通风简易分区模型即时耦合

节能运行

ABSTRACT

With the growing tension of global energy consumption, as well as the continuous

improvement of people's living standards, whether the indoor air-conditioning thermal

environment is comfortable and healthful and air-conditioning operation is

energy-saving have become the focus of attention. Stratified air-conditioning as one of

energy-saving technology has been applied and promoted in the large space building.

On this basis, in order to further reduce air-conditioning energy consumption and

improve indoor thermal environment, the research on utilization of outdoor natural

cold resources to the maximum is the focus of this paper. In this paper, based on taking

both the lower ventilation and the upper stratified air-conditioning running into

consideration at the same time, the idea of bringing in hybrid of both the stratified

air-conditioning and the upper ventilation comes into being , and it can make use of

natural cold resources to take away some part of heat retention of non-air-conditioning

area through the upper ventilation to reduce the air-conditioning energy

consumption .The subject raised and research results will give a reference to

energy-saving running of large space building air-conditioning.

Building energy consumption is closely relevant to indoor air-conditioning load,

and in order to work out a better way of reducing energy consumption in

air-conditioning large space building, firstly the Expo building experimental base is

taken as an study object in this paper, and then a series of theoretical calculations and

analysis enclosing large space building air-conditioning load and variety characteristics

of the thermal transfer volume along with various factors are made, and lastly

discussions on calculation methods adopted are made.

To fully reflect the law of the impact of the stratified air-conditioning coupled

with the upper ventilation on thermal environment in the large space building ,

according to test results of indoor air temperature distribution of eco-building, in the

first place wall surface temperature of building envelope, natural ventilation volume,

and indoor thermal environment are analyzed under two conditions of the upper

ventilation or not at stratified air-conditioning ,and secondly the validity of the upper

ventilation and the stratified air-conditioning was proved, both of which provide a

experimental basis for theory research of upper ventilation validity .

In this paper, numerical simulation methods are adopted to establish a simple

zoning model of large space to analyze the influence of the upper ventilation to the

indoor thermal environment. The model is based on the multi-zone heat and mass

balance principle, and indoor air heat and mass balance equation is established and

made corresponding amendment according to such factors of the upper opening and

interior heat source,, simultaneously coupled with equations of wall heat conductivity,

convection, heat transfer, radiation of non-air-conditioning area, thereby the indoor air

average temperature and the envelope wall surface temperature of non-air-conditioning

area were gained through calculation. Then the effect of the upper ventilation to

air-conditioning load is got by taking above solution as the calculation conditions of

stratified air conditioning load of eco-building, which provides a basis for application

research of stratified air-conditioning and the upper ventilation. Average indoor air

temperature and wall temperature of the non-air-conditioned area under test conditions

by Eco-building model are calculated, the results show that the deviation between the

calculated values and measured is less than 5%. Therefore the simple zoning model in

large space is feasible and effective to predict the indoor thermal environment, when

adopting the stratified air-conditioning coupled with the upper ventilation in the large

space building.

According to the idea of stratified air-conditioning coupled with the upper

ventilation in summer, the concept of switch temperature is raised and its calculation

method is worked out in this paper , and an application analysis for eco-building is

made, then the temperature switch points of the coupling runing in summer design

conditions are determined: the lower switch point temperature tw=22.8℃, the

switching point tw=34.8℃. At the same time, analysis for the influence factors and

energy-saving effect of switch state point are carried out , results shows that the

energy-saving effect of stratified air-conditioning + upper ventilation is significant, its

average energy savings rate for the eco-building is about 21%, up to 48% to the

maximum, and it will rise when the outdoor temperature decreases.When upper

ventilation is used in summer, the total energy-saving volume of air conditioning is

13,200 kWh, if the average system energy efficiency ratio is calculated by COP = 2.5,

power-saving is about 5,300 kWh degrees. Comprehensive results show that the use of

the upper ventilation has a great application potential, and it not only reduces building

energy consumption but also realizes better energy efficiency, what`s more helps to

improve the indoor air quality.

In this paper, research on the application of the upper ventilation coupled with the

stratified air-conditioning system in large space is carried out, through analysis of the

field test and, the establishment of the theoretical model, and application of coupling

immediately method, the running switch point of coupling is obtained, and substantial

energy-saving potential of the upper ventilation in the large space building is verified,

it will provide a theoretical basis and research method for the stratified air-conditioning

in large space building ,therefore, it will have practical engineering significance.

Keywords: large space building, stratified air-conditioning+upper

ventilation, simple zoning model, coupling immediately,

energy-saving operation

中文摘要

ABSTRACT

第一章绪论 ····················································································· 1

§1.1 课题的来源及意义 ······································································ 1

§1.2 国内外研究现状 ········································································· 2

§1.2.1 大空间分层空调的研究 ··························································· 2

§1.2.2 大空间温度场的研究 ······························································ 3

§1.2.3 大空间自然通风的研究 ··························································· 5

§1.2.4 空调与通风耦合的研究 ··························································· 7

§1.2.5 空调系统节能运行的研究 ························································8

§1.2.6 大空间建筑现场实测的研究 ·····················································9

§1.3 本课题研究内容 ······································································· 10

§1.3.1 研究内容 ············································································11

§1.3.2 主要关键技术 ······································································11

第二章分层空调理论与热转移量特性研究 ··············································· 12

§2.1 分层空调冷负荷计算理论 ··························································· 12

§2.1.1 分层空调冷负荷计算特点 ······················································ 12

§2.1.2 分层空调冷负荷组成 ···························································· 13

§2.1.3 分层空调冷负荷计算方法 ······················································ 13

§2.2 分层空调冷负荷实例计算 ··························································· 15

§2.2.1 建筑概况 ············································································15

§2.2.2 空调设计参数 ······································································16

§2.2.3 分层空调夏季冷负荷计算 ······················································ 17

§2.2.4 夏季分层空调能量节约率 ······················································ 23

§2.3 分层空调热转移量特性分析 ························································ 24

§2.3.1 太阳辐射强度对热转移量的影响 ············································· 25

§2.3.2 室外温度对热转移量的影响 ··················································· 26

§2.3.3 通风量对热转移量的影响 ······················································ 27

§2.3.4 分层高度对热转移量的影响 ··················································· 28

§2.4 本章小结 ·················································································29

第三章分层空调与上部通风即时耦合室内热环境实测与分析 ······················· 30

§3.1 生态楼建筑及空调概况 ······························································ 30

§3.1.1 建筑概况 ············································································30

§3.1.2 空调概况 ············································································31

§3.2 生态楼现场测试与分析 ······························································ 31

§3.2.1 测定对象与测试工况 ···························································· 31

§3.2.2 室外环境测试方案与结果分析 ················································ 34

§3.2.3 中庭垂直方向温度测试方案与结果分析 ···································· 35

§3.2.4 围护结构内壁面温度测试方案与结果分析 ································· 39

§3.2.5 自然通风量测试方案与结果分析 ············································· 40

§3.2.6 工作区域水平温度测试方案与结果分析 ···································· 41

§3.3 本章小结 ·················································································43

第四章分层空调与上部通风即时耦合模型的建立与验证 ····························· 45

§4.1 大空间简易分区热质平衡模型 ····················································· 45

§4.1.1 大空间简易分区质平衡 ························································· 46

§4.1.2 大空间简易分区热平衡 ························································· 47

§4.1.3 大空间简易分区热质平衡模型的扩展 ······································· 48

§4.2 大空间简易分区热质交换模型 ····················································· 52

§4.2.1 非等温射流模型 ·································································· 52

§4.2.2 区域间热质交换模型 ···························································· 54

§4.3 自然通风模型 ·········································································· 55

§4.4 大空间简易分区壁面热平衡 ························································ 58

§4.4.1 壁面热平衡方程 ·································································· 59

§4.4.2 互辐射换热量的线性化计算 ··················································· 60

§4.4.3 导热传热外围护结构传热系数的计算 ······································· 60

§4.5 大空间简易分区热质平衡模型的求解 ············································ 62

§4.5.1 边界条件及各参数的确定 ······················································ 62

§4.5.2 热质平衡模型的求解方法 ······················································ 65

§4.6 应用生态楼实例模型计算 ··························································· 68

§4.6.1 计算用建筑物理模型 ···························································· 68

§4.6.2 计算用参数确定 ·································································· 68

§4.6.3 计算结果及分析 ·································································· 70

§4.7 本章小结 ·················································································71

第五章分层空调与上部通风即时耦合运行方法的研究与应用 ······················· 73

§5.1 方案基本设计思想 ···································································· 73

文档加载中……请稍候！
如果长时间未打开，您也可以点击刷新试试。

下载文档到电脑，查找使用更方便

15 积分 4人已下载

立即下载 VIP免费下载

摘要：

摘要随着全球能源消耗的日趋紧张，以及人民生活水平的不断提高，空调室内热环境的舒适性、健康性以及空调运行的节能性等问题已经成为人们关注的焦点。分层空调作为节能技术之一，早已在大空间建筑中得到了应用和推广。在此基础上，为进一步降低空调能耗，改善室内热环境，研究最大限度地利用室外自然冷源便是本文的研究重点。本文提出的分层空调与上部通风即时耦合的思想是基于下部分层空调与上部通风同时运行的思想，利用室外自然冷源通过上部通风带走或部分带走非空调区域滞留的热量，以减少空调能耗，这一课题的提出及其论文研究成果，将为大空间建筑分层空调的节能运行提供参考。建筑空调能耗与室内负荷密切相关，为更好地研究大空间建筑空调...

展开>> 收起<<

大空间分层空调与上部通风即时耦合方法研究.pdf

共99页,预览10页

还剩页未读，继续阅读

大空间分层空调与上部通风即时耦合方法研究

相关推荐

开通VIP享超值会员特权

作者详情

相关内容

推荐作者

热门标签

举报选择: