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A Simulation Study on Radiant Cooling and Heating Systems Utilizing Thermal Storage in Building Structure

建筑结构蓄热辐射供冷供暖系统的模拟研究

基本信息

批准号：
11650611
负责人：
ISHINO Hisaya
金额：
$ 2.3万
依托单位：
TOKYO METROPOLITAN UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650611/
关键词：
thermal storage in building structure radiant cooling system finite element method unsteady state heat flow thermal comfort midnight service of electricity simple calculation method prevention of condensation 放射冷暖房電力平準化夜間移行率

项目摘要

Thermal storage in building structure is one of the most useful means to average energy demand and realize high efficiency of energy use. The effects of thermal storage in building structure can be expected in decrease of initial costs leaded by less capacity of air-conditioning and electrical equipment and also in decrease of running costs leaded by use of midnight service of electricity and less energy use of distribution systems. In addition to these effects, thermal comfort given by radiant cooling and the effect of radiation delay during unconditioning hours can be obtained.At first in this study, field studies were undertaken on the library of O University in Okinawa to clear the characteristics of thermal storage in the floor for cooling, space thermal environment and thermal sensation of occupants. Surface temperature distributions of the floor cooled by chilled water were analyzed and the thermal performance of storage and radiation of the floor panel was shown. And heat extraction rates of the air-conditioning unit and the radiant floor cooling panel were quantified and the economical effects obtained by midnight service of electricity were discussed.Precise simulation was done for furthermore analysis of storage characteristics of the radiant floor panel. The detail of 2-dimensional temperature distributions in the concrete floor slab with buried chilled water pipes were simulated by FEM model. For practical use in floor cooling and heating system analysis and design, a simplified simulation method of the step response of heat flux from the floor were developed. In this method, the response of the floor heating were obtained through the calculation of 1-dimensional thermal conduction in the floor.

建筑结构蓄热是实现能源高效利用和平均能源需求的重要手段之一。建筑结构中的蓄热效果可以预期，在减少空调和电气设备的容量导致的初始成本的降低，以及在减少运行成本导致的使用电力的午夜服务和配电系统的能量消耗的减少。本研究首先以日本冲绳O大学图书馆为研究对象，通过实地调查，了解了地板蓄热的特点、空间热环境和人体热感觉。分析了冷水冷却地板的表面温度分布，揭示了地板的蓄冷和散热性能。对空调机组和地板辐射供冷板的取热率进行了量化，并对夜间供电的经济性进行了讨论，对地板辐射供冷板的蓄冷特性进行了精确的模拟分析。利用有限元模型对埋置冷水管的混凝土楼板的二维温度分布进行了详细的数值模拟。为便于地板供冷供热系统的分析和设计，提出了地板热流阶跃响应的简化模拟方法。在该方法中，地板采暖的响应是通过计算地板中的一维热传导来获得的。