Ventilation And Cooling System Based On The Composition Of Solar Chimney And Passive Evaporative Cooling

As one of the main ways of energy consumption,building energy consumption greatly affects the total energy consumption in the world.As far as China is concerned,in terms of building energy consumption,the energy consumption generated by traditional air conditioning systems should not be underestimated in view of the current development.However,behind this massive consumption of energy,there are a lot of energy waste,not rationalized use and other phenomena and problems.Therefore,people began to seek ways to save energy in air conditioning,and strive to ensure indoor air quality and comfort requirements at the same time,the use of effective means to reduce the energy consumption of air conditioning.In fact,the use of passive technology to improve the indoor thermal environment is reflected in many traditional buildings,but now the use of mechanical equipment to improve the quality of the building environment has gradually become the mainstream of people’s design,so the passive way is often overlooked.However,in the face of the impact of the energy crisis,people began to become more interested in the passive way,and re-study and explore the problem of its ventilation and cooling in buildings.Based on the current research situation of architecture and related technology at home and abroad,this paper proposes a composite passive evaporative cooling ventilation system for solar chimney combined with passive evaporative cooling wind tower,which is mainly studied and analyzed from the following 4 aspects:(1)This paper introduces the research and application status of passive evaporation cooling technology,solar chimney technology at home and abroad,and collates and summarizes it.(2)This paper presents a ventilation and cooling system based on the composition of solar chimney and passive evaporative cooling.Based on the relevant empirical formulas,the relevant design parameters of the ventilation and cooling system based on the composition of solar chimney and passive evaporative cooling and the construction scheme of the experimental platform of the system are determined.(3)Set up the experimental platform of solar chimney composite passive evaporative cooling ventilation cooling system.The temperature and humidity,windspeed,external surface temperature and indoor and outdoor particulate matter of each point in the system were tested respectively.And the test data is analyzed and collated.Through the test: the average temperature of the wind tower cavity decreased by12.1 ℃,the relative humidity increased by 58.5%,and the average direct evaporation cooling efficiency of the passive evaporative cooling wind tower was 81.5% in the test time period.The average temperature of the chimney cavity increased by 9.4 ℃and the relative humidity decreased by 37% on average during the test period,and the average temperature of the outdoor dry ball temperature and the indoor dry ball temperature dropped to 6.9 ℃,and the average relative humidity in the room was58.1%.(4)The applicability of this system in countries and regions along the "Belt and Road" where can use the active evaporative cooling air conditioning system to cool down alone is prospected.The solar energy resources in these areas and the possibility of using passive evaporative cooling technology are discussed and analyzed.It is proved that if the active direct evaporation cooling air conditioning system is used,the wind feeding state point dry ball temperature reaches 20.31℃can meet the requirements of indoor comfort,while the average dry ball temperature of the air outlet in the actual test is 19.85℃,which fully meets the requirements.The results of this paper show,it is feasible to the ventilation and cooling system proposed at this paper in the areas along of the "Belt and Road",such as abundant dry Air energy and solar energy.The system has the following advantages:(1)can solve the problem of indoor ventilation cooling in buildings,(2)improve indoor air quality,filter the particulate matter in outdoor air,(3)save initial investment and operation management costs.If the system is used in buildings,especially in ultra-low energy consumption or 0 energy consumption and other green buildings,can effectively improve the overall economy,energy conservation and environmental protection,to promote the use of new energy and green building development and other aspects have a positive significance.Figures add up to 58,tables total 16,references amount to 69.