This paper briefly analyzes the present situation of textile mill＇s air-conditioning system. Since it is difficult to establish detailed math model to control a textile mill＇s airconditioning system because of the i...This paper briefly analyzes the present situation of textile mill＇s air-conditioning system. Since it is difficult to establish detailed math model to control a textile mill＇s airconditioning system because of the influence of various factors such as the differences in seasons, regions, etc., most air-conditioning equipment can not be controlled automatically. This paper suggests utilizing multi-function data acquisRion card to collect the data about the temperature and humidity of a workshop, processing the data on a PC, comparing them with the expert database, and then using the 485 serial port expanding module to output the parameters, which are used to control the inverter, so that the purpose of adjusting the temperature and humidity of the workshop is achieved.展开更多
The indoor air quality is directly affected by particulate matters(PM).In this study the concentration of indoor and outdoor particles of an apartment and an office were measured.The effect of the concentration of out...The indoor air quality is directly affected by particulate matters(PM).In this study the concentration of indoor and outdoor particles of an apartment and an office were measured.The effect of the concentration of outdoor particles on the concentration of indoor particles was analyzed.The results demonstrate that concentration of indoor and outdoor particles has 2-3 peak points during one day.The indoor to outdoor ratio increases as the size of particles decreases,which indicates that the fine particles penetrate through the building envelopes more easily.The concentration of indoor particles is closely correlated with the concentration of outdoor particles,and the correlation increases as the size of particles decreases.展开更多
An adjustable ejector expansion device for a CO2 heat pump water heater (HPWP) is proposed to improve the system performance. It has been designed to investigate experimentally the effects of the motive nozzle throat ...An adjustable ejector expansion device for a CO2 heat pump water heater (HPWP) is proposed to improve the system performance. It has been designed to investigate experimentally the effects of the motive nozzle throat area of the ejector, entrained flow pressure, back pressure and primary flow pressure on the entrainment ratio. Experiments based on different motive nozzle throat areas were conducted and the results of the prototype ejector using CO2 as working fluid are presented. The results show that an adjustable ejector can achieve high performance and work well in a wide range of working conditions.展开更多
文摘This paper briefly analyzes the present situation of textile mill＇s air-conditioning system. Since it is difficult to establish detailed math model to control a textile mill＇s airconditioning system because of the influence of various factors such as the differences in seasons, regions, etc., most air-conditioning equipment can not be controlled automatically. This paper suggests utilizing multi-function data acquisRion card to collect the data about the temperature and humidity of a workshop, processing the data on a PC, comparing them with the expert database, and then using the 485 serial port expanding module to output the parameters, which are used to control the inverter, so that the purpose of adjusting the temperature and humidity of the workshop is achieved.
基金The Specialized Research Fund for the Doctoral Program of Higher Education of China(No.20050248017)
文摘The indoor air quality is directly affected by particulate matters(PM).In this study the concentration of indoor and outdoor particles of an apartment and an office were measured.The effect of the concentration of outdoor particles on the concentration of indoor particles was analyzed.The results demonstrate that concentration of indoor and outdoor particles has 2-3 peak points during one day.The indoor to outdoor ratio increases as the size of particles decreases,which indicates that the fine particles penetrate through the building envelopes more easily.The concentration of indoor particles is closely correlated with the concentration of outdoor particles,and the correlation increases as the size of particles decreases.
基金supported by the National Key Technologies R&D Program of China (No. 2006BAJ01A10)the Science and Technology Plan of Zhejiang Province (No. 2007C01002), China
文摘An adjustable ejector expansion device for a CO2 heat pump water heater (HPWP) is proposed to improve the system performance. It has been designed to investigate experimentally the effects of the motive nozzle throat area of the ejector, entrained flow pressure, back pressure and primary flow pressure on the entrainment ratio. Experiments based on different motive nozzle throat areas were conducted and the results of the prototype ejector using CO2 as working fluid are presented. The results show that an adjustable ejector can achieve high performance and work well in a wide range of working conditions.
