Heating Performance Analysis Of Solar Cogeneration System With Heat Pipe For Enhanced Heat Transfer

This paper studies the heating performance of solar cogeneration system based on heat pipe heat transfer.First,we build solar cogeneration system,which produces heat while generating electricity,and then carry out heating performance analysis on this part of heat.The solar cogener-ation system mainly include:solar photovoltaic modules,insulation layer,insulation shell,gravity heat pipe,insulation baffle,axial fan,etc.Among which,the heat pipe is the key component of cogeneration,part of the heat of the solar photovoltaic backplane is brought into the air flow pas-sage by strengthening the heat transfer,and the air in the channel is heated,then the hot air is sent to the outside of the system by hot pressing and axial fans.Starting with the solar cogeneration system,firstly,the solar heat and power cogeneration system with heat pipe intensification is analyzed theoretically,and then the experimental platform is built to do the experiment.Experimental results show that the heat pipe has a significant effect on the temperature rise of the outlet air.In the case of an axial fan,the outlet air temperature is 1.51℃～2.02℃ higher to the heat pipe.Through the heat generation analysis for the solar cogen-eration system,it is found that the maximum thermal efficiency and the average thermal efficiency increase with the increase of the fan control voltage.The main reason is the different wind speed.When the fan control voltage is 225V,the maximum heat efficiency of the hot heat exchange sys-tem is 46.1%and the average thermal efficiency is 25.4%.The temperature of the outlet air range above 18℃ is 5.5～8 hours.As it takes about 10 hours for the experimental area in winter from rising to falling,that is,in the time of solar radiation,55%～80%of the time can be used for winter heating.On the contrary,without the use of solar cogeneration units,the temperature range above 18℃ is 0～2 hours.It is visible that solar cogeneration plants can improve the export air temper-ature significantly,so that the export air can meet the requirements of winter heating to a large extent.The outlet air flow rate is less affected by the hot pressure,and the axial flow fan plays a decisive role in the outlet air flow rate.At the same time,the computational fluid software Fluent is used to simulate the correspond-ing experimental conditions,the data obtained are in good agreement with the measured data,which proves that the solar cogeneration plants can effectively improve the outlet air temperature and make the export air meet the requirements of winter heating to a great extent,the outlet air flow rate also depends on the axial fan.