Experimental Study Of Air Conditioning System Coupled With Radiation Air Conditioning And Attached Jet

In recent years,the living standard of our residents has been improving,and people’s demand for material life and environmental comfort is getting higher and higher,especially in recent years by the impact of the new crown epidemic,people are in long-term isolation,air conditioning has become an essential tool to regulate the comfort of the indoor environment,and the radiant cooling air conditioning system has received unprecedented attention and many scholars’ research because of its high comfort,low energy consumption,and the advantages of environmental health.Radiation air conditioning and attached jet coupled air conditioning system belongs to the temperature and humidity independent control system,the radiation cold plate mainly bears the apparent heat load of the room,the fresh air mainly bears the indoor wet load,radiation air conditioning system commonly has three system forms: radiation cold plate installed in the indoor single side wall,symmetrical wall and top plate position,this thesis built a test bench of three system forms of radiation air conditioning,experimental research in different water supply temperature,the The difference of indoor heat and humidity environment under three different radiation air-conditioning systems.The thesis mainly analyzes the thermal comfort indexes such as radiant heat exchange ratio,indoor temperature,indoor humidity,local dissatisfaction rate caused by the sense of blowing air and indoor vertical temperature difference of the air conditioning systems under different temperatures,and compares the differences in heat exchange,cooling and dehumidification efficiency,radiant end energy consumption and comfort attainment rate of different air conditioning system forms under different water supply temperatures.The research results show that under the water supply temperature of 12℃～22℃,the best water supply temperature of single-side wall radiation + attached jet air conditioning system is about 18℃,the best water supply temperature of symmetrical wall radiation +attached jet air conditioning system is about 22℃,the best water supply temperature of top plate radiation + attached jet air conditioning system is about 16℃,and all three air conditioning systems are in Condensation occurred on the surface of the radiating cold plate at a water supply temperature of about 12℃,and the condensation phenomenon was most serious for the top plate radiation + attached jet air conditioning system,and the condensation phenomenon was the least for the symmetrical wall radiation + attached jet air conditioning system.The temperature of the human working area created by the three air conditioning system forms of single-side wall,symmetrical wall and top plate at the respective optimal water supply temperature is about 26℃,26.3℃ and 26.4℃,and the humidity is about 58%,53% and 57%,while the cooling and dehumidification efficiency of the symmetrical radiant cold plate is the highest;the comfort level of the three air conditioning systems all meet the requirements of China’s level II comfort level,while in a certain period of time they can At the same time,the indoor comfort environment created by the top plate and the symmetrical wall radiation + attached jet air conditioning system is the highest in different horizontal positions and vertical surfaces are relatively evenly distributed,while the comfort level of single-side wall radiation + attached jet air conditioning system in the horizontal position does not differ much,and in the vertical direction,the closer to the radiation cold plate,the higher the comfort level of human body.In this experimental system,under the same water supply temperature and certain air supply volume,the heat exchange per unit radiating cold plate area of the symmetric wall radiation + attached jet air conditioning system is the smallest,and the heat exchange per unit radiating cold plate area of the top radiation + attached jet air conditioning system is the largest.The heat exchange per unit radiant cold plate area is the largest for the top-plate radiant + attached jet air conditioning system.After 10 hours of operation of the three air conditioning systems at their respective optimal water supply temperatures,when the indoor temperature and humidity reach the design parameters,the radiation end energy consumption of the top plate radiation + attached jet air conditioning system is the largest,14.24 k W·h,the radiation end energy consumption of the single side wall radiation air conditioning is the second largest,5.71 k W·h,and the energy consumption of the symmetric wall radiation + attached jet air conditioning system is the smallest,3.99 k W·h.h,so it is recommended that when choosing radiation air conditioning system,priority should be given to symmetric wall radiation + attached jet air conditioning system,followed by single-side wall radiation + attached jet air conditioning system,when the wall is not suitable for installing radiation cold plate,then consider the top plate radiation + attached jet air conditioning system,but pay attention to the distance between the radiation top plate and the working area.