An analysis of freezing/thawing process in building wall

建筑墙体冻融过程分析

• 批准号: 09650658
• 负责人: MATSUMOTO Mamoru
• 金额: $ 1.86万
• 依托单位: Osaka-sangyo University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650658/
• 关键词: Freezing and thawing; Transient heat and moisture transfer; Porous media; Prevention to freeze damage; Numerical analysis; Effect of hysteresis; Mathematical model; Simulation

(1) Governing equations are derived for simultaneoous heat and moisture transfer which can be applied to freezing and thawing processes. Closing of the equations is discusse.(2) For closing the governing equations, equilibrium relations of the liquid water content and moisture (chemical) potential under freezing regime are presented and discussed how to measure or how to estimate. Along with, the freezing point depression is shown as a function of moisture (chemical) potential.(3) A quasi-linearized equation are derived, based on simautaneous heat and moisture transfer equations. The equations derived are Linear but time variant and coefficients of the equations are obtained by solving original nonlinaer equations on the paticular but arbitrary boundary conditions.(4) As an example of simulation, freezing and thawing process in the building wall, thermally insulated by glass wool on inner side of the wall and layered by moisture barrier at outer surface, is numerically analyzed.(5) A numerical method to analyze transient beat and moisture transfer considering hysteresis effects are presented.

(1)导出了适用于冻结和解冻过程的非稳态热湿迁移控制方程。讨论了方程的闭合问题。(2)为了封闭控制方程，给出了冻结状态下液态水含量和水分（化学）势的平衡关系，并讨论了如何测量或如何估计。沿着，凝固点降低被示出为水分（化学）势的函数。(3)本文从热湿同时传递方程出发，导出了准线性化方程。所导出的方程是线性时变的，方程的系数是在特定的任意边界条件下通过求解原非线性方程得到的。(4)作为数值模拟的实例，对墙体内侧采用玻璃棉保温，外侧采用防潮层的建筑墙体的冻融过程进行了数值分析。(5)提出了一种考虑迟滞效应的瞬态热湿传递数值分析方法。

项目成果

畑野、鉾井、松本: "建築壁体における凍結、融解過程に関する研究" 日本建築学会大会梗概集 環境工学2. 269-270 (1997)

Hatano、Hokoi、Matsumoto：“建筑墙体冻结和解冻过程的研究”日本建筑学院学报，环境工程 2. 269-270 (1997)

川田、松下、小椋、松本: "吸湿履歴を考慮した建築壁体の水分挙動解析" 日本建築学会大会梗概集 環境工学2. 325-326 (1997)

Kawada、Matsushita、Ogura、Matsumoto：“考虑吸湿历史的建筑墙体吸湿行为分析”日本建筑学院学报，环境工程 2. 325-326 (1997)

Kawata, H.Matsushita, T.Ogura, D.Matsumoto, M.: "An analysis of moisture transfer in building wall considering Hysteresis effect (in Japanese)" Proc.annual meeting Env.Div.(2) AIJ. 325-326 (1997)

Kawata, H.Matsushita, T.Ogura, D.Matsumoto, M.：“考虑滞后效应的建筑墙体水分传递分析（日语）”Proc.annual Meeting Env.Div.(2) AIJ。

Matsushita, T.Kawata, H.Ogura, D.Matsumoto, M.: "An analysis of hysteresis effect of ad/de sorption isotherm curve of micro porous building material under thermal and humidity condition in Osaka" Trans of AIJ Planning and Envir.Eng.No.521(To be published)

Matsushita，T.Kawata，H.Ogura，D.Matsumoto，M.：“大阪热湿条件下微孔建筑材料吸附/脱附等温线的滞后效应分析”，AIJ Planning 和 Envir 翻译。

Hatano M.Hokoi S.Matsumoto M.: "An analysis of freezing-thawing processes in building walls" CIB Proc.Pub.213. 141-158 (1998)

Hatano M.Hokoi S.Matsumoto M.：“建筑墙壁冻融过程的分析”CIB Proc.Pub.213。