This research presents a new method to boost the efficiency of evaporative coolers by integrating magnetized water and a heat exchanger.Magnetized water,known for its high evaporation rate and reduced surface tension,...This research presents a new method to boost the efficiency of evaporative coolers by integrating magnetized water and a heat exchanger.Magnetized water,known for its high evaporation rate and reduced surface tension,offers a promising way to enhance air cooler performance.Additionally,the advanced heat exchanger both improves air cooling capacity and controls humidity levels.Aloni 100 L,a locally manufactured evaporative cooling system,and tap water were used in experiments.Tap water was magnetized using recycled magnets extracted from computer hard drives.Twenty-six magnets meticulously arranged within rectangular grooves,each with a minimum strength of 0.5 to 1T,were used tomagnetize tapwater.Our experiments showa significant rise in cooling efficiency,with magnetized water increasing from 70.62%to 91.43%.In a similar vein,adding the heat exchanger leads to a significant improvement,raising the cooling efficiency from 69.44%to 93.96%.Furthermore,the combined use of magnetized water and a heat exchanger results in exceptional performance,increasing cooling efficiencies by 29.5%and 35.3%compared to using only magnetized water or only a heat exchanger,respectively.This study also explores the largely untapped potential of magnetized water,providing valuable insights into its effects on water properties and its broader applications in various fields.These findings represent a significant advancement in air cooling technology and pave the way for more energy-efficient and sustainable solutions.展开更多
Helium sorption cooler technology is a key means to realize highly reliable low-vibration very lowtemperature environments,which have important applications in fields such as quantum computing and space exploration.Th...Helium sorption cooler technology is a key means to realize highly reliable low-vibration very lowtemperature environments,which have important applications in fields such as quantum computing and space exploration.The laboratory designed a superfluid suppression small hole and a multi-ribbed condenser,developed a reliable-performance helium sorption cooler(HSC),and conducted experimental studies.Experimental results show that the prototype can achieve the lowest cooling temperature of 873 mK without load by filling 6MPa helium at room temperature.The low-temperature hold time is 26 h,and the temperature fluctuation is within 0.8 mK.The cooling power of the helium sorption cooler is 1 mW@0.98 K@3.5 h.Experimental results indicate that when the charging pressure is reduced to 4MPa,theminimum temperature decreases to 836mK,and the hold time shortens to 16 h.When the pre-cooling temperature increases from 3.9 to 4.9 K,the hold time is reduced to 3 h.展开更多
To improve the wall surface hydrophilicity of a tube type indirect evaporative cooler,a new method adopting porous ceramics is proposed.This method realizes the combination of porous ceramics and the evaporative cooli...To improve the wall surface hydrophilicity of a tube type indirect evaporative cooler,a new method adopting porous ceramics is proposed.This method realizes the combination of porous ceramics and the evaporative cooling technique.The design calculation of the porous ceramics tube type dew point indirect evaporative cooler are carried out from such aspects as the volumes and status parameters of the primary and secondary air,the cooler structure,the heat transfer of the solid porous ceramic tubes and the resistance of the cooler.The calculation results show that the design is reasonable.Finally,based on the design calculation,the porous ceramics tube type dew point indirect evaporative cooler is successfully manufactured.展开更多
Based on the fluid network theory,the possibility of utilizing regenerator flow resistance to suppress the direct current （DC） flow induced by the introduction of a double-inlet in a pulse tube cooler is investigate...Based on the fluid network theory,the possibility of utilizing regenerator flow resistance to suppress the direct current （DC） flow induced by the introduction of a double-inlet in a pulse tube cooler is investigated theoretically. The calculation results show that increasing regenerator flow resistance can lead to a smaller extent of DC flow.Therefore,a better stability performance of the cooler can be realized.On this basis,the stability characteristics of the cooler with various regenerator matrix arrangements are studied by experiments.By replacing 30% space of 247 screens of stainless steel mesh at the cold part of the regenerator by lead balls of 0.25 mm diameter,a long-time stable temperature output at 80 K region is achieved. This achievement provides a new way to obtain stable performance for pulse tube coolers at high temperature and is helpful for its application.展开更多
文摘This research presents a new method to boost the efficiency of evaporative coolers by integrating magnetized water and a heat exchanger.Magnetized water,known for its high evaporation rate and reduced surface tension,offers a promising way to enhance air cooler performance.Additionally,the advanced heat exchanger both improves air cooling capacity and controls humidity levels.Aloni 100 L,a locally manufactured evaporative cooling system,and tap water were used in experiments.Tap water was magnetized using recycled magnets extracted from computer hard drives.Twenty-six magnets meticulously arranged within rectangular grooves,each with a minimum strength of 0.5 to 1T,were used tomagnetize tapwater.Our experiments showa significant rise in cooling efficiency,with magnetized water increasing from 70.62%to 91.43%.In a similar vein,adding the heat exchanger leads to a significant improvement,raising the cooling efficiency from 69.44%to 93.96%.Furthermore,the combined use of magnetized water and a heat exchanger results in exceptional performance,increasing cooling efficiencies by 29.5%and 35.3%compared to using only magnetized water or only a heat exchanger,respectively.This study also explores the largely untapped potential of magnetized water,providing valuable insights into its effects on water properties and its broader applications in various fields.These findings represent a significant advancement in air cooling technology and pave the way for more energy-efficient and sustainable solutions.
基金supported by the Hundred Talents Programof the Chinese Academy of Sciences,the Pre-Research Project JZX7Y20220414101801the Strategic Priority Research Program of Chinese Academy of Sciences(No.XDB35000000)the National Natural Science Foundation Projects(No.51806231).
文摘Helium sorption cooler technology is a key means to realize highly reliable low-vibration very lowtemperature environments,which have important applications in fields such as quantum computing and space exploration.The laboratory designed a superfluid suppression small hole and a multi-ribbed condenser,developed a reliable-performance helium sorption cooler(HSC),and conducted experimental studies.Experimental results show that the prototype can achieve the lowest cooling temperature of 873 mK without load by filling 6MPa helium at room temperature.The low-temperature hold time is 26 h,and the temperature fluctuation is within 0.8 mK.The cooling power of the helium sorption cooler is 1 mW@0.98 K@3.5 h.Experimental results indicate that when the charging pressure is reduced to 4MPa,theminimum temperature decreases to 836mK,and the hold time shortens to 16 h.When the pre-cooling temperature increases from 3.9 to 4.9 K,the hold time is reduced to 3 h.
基金The National Natural Science Foundation of China(No.50846056)
文摘To improve the wall surface hydrophilicity of a tube type indirect evaporative cooler,a new method adopting porous ceramics is proposed.This method realizes the combination of porous ceramics and the evaporative cooling technique.The design calculation of the porous ceramics tube type dew point indirect evaporative cooler are carried out from such aspects as the volumes and status parameters of the primary and secondary air,the cooler structure,the heat transfer of the solid porous ceramic tubes and the resistance of the cooler.The calculation results show that the design is reasonable.Finally,based on the design calculation,the porous ceramics tube type dew point indirect evaporative cooler is successfully manufactured.
基金The National Natural Science Foundation of China(No.50406009).
文摘Based on the fluid network theory,the possibility of utilizing regenerator flow resistance to suppress the direct current （DC） flow induced by the introduction of a double-inlet in a pulse tube cooler is investigated theoretically. The calculation results show that increasing regenerator flow resistance can lead to a smaller extent of DC flow.Therefore,a better stability performance of the cooler can be realized.On this basis,the stability characteristics of the cooler with various regenerator matrix arrangements are studied by experiments.By replacing 30% space of 247 screens of stainless steel mesh at the cold part of the regenerator by lead balls of 0.25 mm diameter,a long-time stable temperature output at 80 K region is achieved. This achievement provides a new way to obtain stable performance for pulse tube coolers at high temperature and is helpful for its application.
