Research On BIPVT Air Conditioning System And Characteristics Based On Gravity Heat Pipe Technology

In China,the current energy consumption of buildings accounts for about 1/3 of the total energy consumption of the whole society,and the largest proportion of building energy consumption is HVAC energy consumption,which accounts for 65% of building energy consumption.With the improvement of the people’s material living standards in our country,the demand for HVAC is getting higher and higher,which has brought greater challenges to China’s building energy efficiency.With the increasing severity of environmental problems and the depletion of conventional energy sources,solar energy has attracted widespread attention because it is a renewable green energy source.BIPVT technology has emerged at the historic moment and has been rapidly developed in recent years.There are two main ways to use solar energy: photo-thermal technology and photovoltaic technology.At present,the most popular and mature solar technology is solar thermal technology.BIPVT technology is an organic combination of photo-thermal technology and solar tender photovoltaic technology to the building.This advantage is that it can not only obtain heat and electricity at the same time,improve the comprehensive utilization of solar energy,but also use the building to solve the shortcomings of large area.Gravity heat pipe is a kind of element with good heat transfer performance.Combining gravity heat pipe with solar BIPVT technology,using the phase change of the working liquid inside the gravity heat pipe to achieve heat transfer to reduce the operating temperature of the solar photovoltaic panel and improve the photoelectric conversion efficiency.In this paper,the BIPVT air-conditioning system of gravity heat pipe is designed for the call of green building in the corresponding country.First,select the appropriate gravity heat pipe,and then set up an experimental bench to monitor the photovoltaic light and heat part of the gravity heat pipe BIPVT air-conditioning system by using experimental instruments.The comparison experiment was performed by comparing the presence or absence of heat pipes,changing the ventilation speed,and whether or not a baffle was installed.The experimental results show that the greater the ventilation speed and the longer the flow path,the higher thephotoelectric conversion efficiency of the air conditioning system with gravity heat pipes.The experimental bench structure was used to collect experimental data in summer and winter,and the photoelectric conversion efficiency in summer and winter were obtained.The numerical simulation method was used to study the effects of gravity heat pipes and ventilation on the photovoltaic conversion of solar photovoltaic panels,and a numerical simulation model of solar photovoltaic panels was established.According to the design conditions,the surface temperature of the solar photovoltaic panel and the temperature of the air interlayer were dynamically simulated,and it was concluded that the gravity heat pipe can reduce the temperature of the solar photovoltaic panel surface;ventilation can reduce the temperature of the solar photovoltaic panel surface;increasing the ventilation path can Reduce the temperature of the surface of the solar photovoltaic panel.In addition,the accuracy of the calculation model was also verified by experiments.Through experimental and theoretical analysis,this paper studies the characteristics,optimization,and application design of the photoelectric conversion efficiency of the photovoltaic and photo-thermal part of the gravity heat pipe BIPVT air conditioning system.By combining the air source heat pump system or the water source heat pump system,the problem that the system cannot be used alone can be solved.Finally,the economic,energy saving and environmental protection of the gravity heat pipe BIPVT air conditioning system is analyzed.Overall performance and economic benefits,this technology can develop in the direction of more energy saving.