Construction And Experimental Verification Of RC Network Model For Heat Transfer Process Of Floor Radiant Cooling Space

Capillary floor radiant air conditioning system is a new type of energy-saving technology,with the advantages of comfort,high temperature and high pressure,corrosion resistance and so on.Unlike traditional air conditioners,it is directly combined as a building component and building space,with radiation heat transfer between the interior surfaces of the building.Building space height parameters have an important impact on the calculation of radiative heat transfer load.The influence of building space height parameters on radiation heat transfer:(1)The change of building space height affects the angular coefficient and radiation amount.(2)Due to the natural circulation of air,temperature differences are formed at different building space heights.(3)There is a high degree of correction in the relevant specifications.In this paper,the RC network model and its mathematical model of floor radiant cooling space heat transfer process are firstly established.Secondly,the accuracy of the model is verified by experiments to analyze the influence of building space height on indoor thermal environment.Finally,the building space height to floor radiant air conditioning system is discussed.The effect of the heat transfer mechanism.The main conclusions and results of the research are as follows:(1)Establish the RC network model for the heat transfer process of the floor radiant cooling space,according to the Kirchhoff column mathematical model and calculate with MATLAB software.(2)Using the variable space laboratory of Tianjin University to carry out experimental tests to analyze the changes of indoor thermal environment under different building space heights.The study found that indoor air temperature,wall temperature and heat flux density change with the increase of building space height.(3)Verify the RC model proposed in 1 using experimental data.The error between the calculated value and the measured value at different time and different building space heights is analyzed within 15%,indicating the accuracy of the RC model.(4)Discuss the influence of the height of the building space on the heat transfer mechanism of the floor radiant air conditioning system,including the diagonal coefficient of the building space,the thermal resistance of the radiated space,the variation of the radiative heat transfer and the convective heat transfer,and the radiation heat transfer and The influence of the proportional relationship of convective heat transfer.Studies have shown that when the ground surface or ceiling is perpendicular to the side wall,the side wall is perpendicular to the side wall,and the side wall is parallel to the side wall,as the height of the building space increases,the angular coefficient increases,and the thermal resistance of the radiation space decreases;the local surface is parallel to When the ceiling is raised,the angular coefficient decreases and the thermal resistance of the radiation space increases as the height of the building space increases.As the height of the building space decreases,the amount of radiation of each wall decreases,the flow rate decreases,and the amount of radiation and the flow rate The proportion is gradually decreasing.The paper has 62 pictures,20 tables and 66 references.