The Application Of The Cooling Tower That Applies The Passive Downdraught Evaporative Cooling Technology In Dry Areas

With the rapid development of economy,people's life level is also gradually improving from mere pursuit for warmth and satiety to current pursuit for high-quality life.Such a pursuit is represented as people's higher and higher demands for their living environment in the architecture industry,from which the hot topic,architectural energy-saving and sustainable development,is aroused.The appropriate utilization of renewable energy and natural low-temperature sources to replace the consumption of conventional energy in the architecture industry and adherence to the design principle of“passive priority and initiative supplemented” are of great realistic significance in the process of continuing to make every effort to promote the green development of China during the “13th Five-year Plan”.Combined with the climate features of dry areas,after preparing cold air utilizing the abundant dry air,the cooling tower that ventilates and cools the architectural space based on the principle of hot press ventilation and applies passive evaporative cooling technology can be regarded as a natural “air conditioner” that is not only featured with energy-saving,environmental-friendly and renewable but also can improve the indoor environment quality and reduce the environment costs.Thus,based on the new orientation of research in HVAC area,namely the passive evaporative cooling technology,the application of the cooling tower that applies the passive evaporative cooling technology in dry areas is researched in this subject.The major research contents and methods of this paper are listed as below:(1)The theoretical research related to the downward ventilation cooling technology based on passive evaporative cooling.The theoretical foundation,such as the source,basic principles and type,of the technology is rearranged and its research status,achievements,application advantages and deficiencies,design methods and principles at home and abroad are rearranged and summarized.The practical engineering cases in foreign dry areas are explored and analyzed and its application potential in dry areas in China is predicted and prospected based on the climate analysis on dry areas in China.(2)Based on the theoretical calculation of the technology,the design parameters related to the cooling tower that applies the passive evaporative cooling technology are determined.Under the calculation conditions in this paper,according to the outdoor ventilation conditions in summers of Urumqi,Xinjiang,the temperature and relative humidity are calculated.With reference to experiential formulas testified by foreign scholars,design parameters,including the evaporation cooling efficiency of the cooling tower,the air supply temperature of the cooling tower and the effective height of the cooling tower,are determined and schemes where the experimental model of ventilation and cooling of the cooling tower that applies the passive evaporative cooling technology isconstructed are provided.(3)The experimental model of ventilation and cooling of the cooling tower that applies the passive evaporative cooling technology is constructed to test the outdoor natural ventilation,different outdoor wind speeds and the cooling effect of the cooling tower under the circumstance where the system is formed after combination with the air exhausting machine.Through collection of data related to the experimental model of the cooling tower,the changing principles of the cooling effects of the cooling tower are obtained.With this experimental model as the research subject,FLUENT software is applied to simulate the cooling situations of the area where it is located.The temperature field and the speed field after the ventilation and cooling inside the experimental model are obtained.The experimental and simulation results are compared and the generated errors are analyzed.(4)The aspects,such as economic benefits,environmental benefits,health benefits and social benefits,of the downward ventilation cooling technology based on passive evaporative cooling technology are evaluated and the application advantages and better prospects of the technology in dry areas are further proved.Meanwhile,the problems that emerge during the actual operation process of the cooling tower that applies the passive evaporative cooling technology are analyzed and improving measures are proposed.New combination forms are formed with combination of other technology,providing relevant materials for the improvement and promotion of such a new low-energy-consuming technology of ventilation and cooling in the future.The research results of this paper show: the application of the cooling tower that applies the passive evaporative cooling technology in dry areas is an energy-saving and environmental-friendly design with bright future.Through various research methods,like theoretical calculation,numerical value simulation and actual tests through constructing the experimental model,it is proved that the cooling effects of the cooling tower that applies the passive evaporative cooling technology in dry areas are apparent and it is simultaneously expected that it can expand the ideas and provide reference for future research of the downward ventilation technology based on passive evaporative cooling technology that can effective replaces air-conditioners in dry areas.