Research on design methods for heating and cooling systems using radiators with complex geometry

2023 Fiscal Year Final Research Report

• Project/Area Number: 19K04732
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 23020:Architectural environment and building equipment-related
• Research Institution: University of Niigata Prefecture
• Principal Investigator: SAKAGUCHI JUN 新潟県立大学, 国際経済学部, 教授 (90300079)
• Project Period (FY): 2019-04-01 – 2024-03-31
• Keywords: 放熱器 / 対流熱伝達 / 放射熱伝達

Outline of Final Research Achievements

In this study, airflow and temperature distributions around heat radiators of simple and complex shapes are analyzed by thermal fluid dynamics (CFD) to clarify the relations between the shape of the heat radiators and the natural convection field. A vector radiation thermometer is developed using CFD with reference to previous studies. The analysis with a heating source equivalent of a home-use oil heater installed in the center of the room revealed that the differences in airflow and temperature distribution between calculation cases were small. CFD of the vector radiation thermometer reveals that although good theoretical results were obtained for the analysis in two parallel plates, it is difficult to make a simple model for the radiation of the heat sink using the vector radiation thermometer due to radiation heat transfer from walls, floors and ceilings other than the heat sink in the real space analysis .

Free Research Field

建築環境学

Academic Significance and Societal Importance of the Research Achievements

本研究では複雑形状の放熱器で主に自然対流によって冷暖房を行う場合の室内気流分布と放熱器の形状について考察した。本研究では合計6ケースの放熱器周りの気流分布を解析しているが、放熱器の形状による気流・温度分布の違いは少ないことが明らかになった。本研究ではさらにベクトル放射温度計を用いて複雑形状の放熱器の放射熱伝達の簡易モデルについてCFDを用いて検討を行っている。ベクトル放射温度計は既往研究でも色々と試みられているが、屋外空間やビニールハウス、畜舎などの断熱気密性能の低い環境において行われているものであり、本研究のような住空間を対象にしていない。ベクトル放射温度計を用いたモデル化は困難であった。