Research On Heat Transfer And Dehumidification Efficiency Evaluation Of Capillary Radiation Air-condition Terminal

Capillary network is the main heat exchange equipment of capillary radiation air-condition system.Its efficiency affects the thermal efficiency of air-condition system directly.Therefore make a evaluation on efficiency for capillary radiation air-condition terminal,reduce the irreversible dissipation in the heat exchange process, to improve the heat transfer performance,is an important mean of energy conservation.This paper take a series research based on capillary radiation air-condition and gravity tank of energy conservation and emissions reduction laboratory in China University of Mining and Technology.And obtain the temperature and humidity distribution for air-condition system stable operation,the variation of temperature in the middle of laboratory and entransy dissipation rate with different supply water temperature in summer and winter,the change of fluids temperature and entransy dissipation rate along the capillary pipe in gravity tank,and the influence of supply water temperature on entransy dissipation rate and dehumidification in gravity tank. And making a comprehensive evaluation on heat transfer and dehumidification efficiency of capillary radiation air-condition terminal through comfort,energy consumption and entransy dissipation rate.Experimental study and theoretical analysis show that temperature of O(0,0,2.08)increase with supply water temperature rise in comfort range and entransy dissipation rate has the opposite trend in summer;temperature of O(0,0,2.08)increase with supply water temperature rise and the rate gradually slowed in winter.When supply water temperature is 20~25℃,the temperature from 16.7℃to 20.0℃;When supply water temperature between 25~30 ℃,the temperature from 20 ℃ to 20.6℃.And the entransy dissipation rate increase with supply water temperature rise because of large temperature difference in winter.Comfort,energy consumption and entransy dissipation rate have different variation in different supply water temperature range.When supply water temperature of ceiling capillary in air-condition system is 20~25℃,the three indicators have a high level,better comfort reaction, less energy consumption,entransy dissipation rate in a low level.The water temperature increased modestly along the capillary length,air temperature decreases the reduce speed gradually slow down.Entransy dissipation rate constant decreases along water flow direction of gravity tank condensation area,and the decrease speed gradually slow down.Dehumidification capacity reduce with supply water temperature rise when gravity tank at the constant flow 600L/h.Entransy dissipation rate decreases with supply water temperature rise,and the speed gradually slow down.The influence of capillary water supply temperature on entransy dissipation rate 14℃for turning point, entransy dissipation rate decreases with the increase of the temperature of the water supply in 10~14 ℃.When the water temperature is larger than 14 ℃ entransy dissipation rate has a little change.When the gravity tank capillary water supply temperature within 14~15 ℃ and with constant flow 600L/h,its heat exchange performance is better,and entransy dissipation rate is low of the heat exchange process.