Experiment On Heating Performance Of New Small Channel Convection-radiant Wall Panel

At present,the traditional air conditioner reduces the indoor cold and heat load through the convection heat exchange method,and has noise problems and blowing feeling problems.In order to improve the indoor thermal environment,radiation heat transfer mode has appeared,which has certain advantages in the indoor thermal environment of the building.But its indoor temperature response is slow.In this paper,a new type of small-channel wall panel structure is proposed based on the convection and radiation heat transfer methods.The small channel straight tube effectively solves the problem that the heat medium flows through the coil and has a large thermal resistance.By testing its heating performance parameters and studying the indoor thermal environment,under the pure radiation and radiation convection conditions,the operation effect is explored.The small channel wall panel and the system test bench for designing hot water as the heat medium are completed,and the arrangement of the experimental measuring points is completed.Error analysis is performed,and the measurement data meets the experimental accuracy requirements.Based on the artificial microclimate experimental platform,the heating experiment of the small channel wall panel under pure radiation and radiation-forced convection conditions was carried out.The variation law of surface temperature,inlet and outlet air temperature,radiation convection heat transfer and other parameters of wall panel is studied.The effects of water supply temperature and flow rate,air supply volume and outdoor temperature on the heating performance were analyzed.Study the indoor thermal environment changes including indoor vertical temperature and inner wall surface temperature and other parameters.Analyze the influence of water supply temperature and flow rate,fan air supply volume and outdoor temperature on indoor thermal environment.The effects of fan opening time on the heating performance of the wall panel and the indoor thermal environment in the intermittent heating mode were studied.The experimental results show that the water supply temperature is the main factor affecting the stable temperature of the wall surface of the wall panel under the heating condition of-11.0 degrees Celsius outdoor temperature.Changing the fan volume can control the ratio of radiated heat transfer and forced convection heat transfer.The higher the water supply temperature,the greater the vertical temperature difference.The later the fan is turned on,the faster the convective radiation raises the room temperature,the smaller the average temperature of the plate surface is,the larger the temperature rise of the inner wall surface is,and the faster the temperature difference between the inlet and outlet is.The water supply temperature is 40 degrees Celsius,the water supply flow rate is 0.73 m~3/h,and the air supply volume is 660 m~3/h.The wall panel surface stability temperature is 34.3 degrees Celsius,the indoor vertical temperature difference is 3degrees Celsius,and the inlet and outlet air temperature difference is 4.3 degrees Celsius.The research work in this paper allows us to better study the heating performance of small-channel wall panels and find the best way to improve the indoor thermal environment under the end heating.