| The unit evaporative air conditioning has been widely used in industrial construction,agricultural construction,civil construction and public buildings due to its simple structure,diverse forms and effective use.It has become one of the most widely used forms of evaporative cooling technology.One,but lacks a more systematic classification.Through investigation,it is found that due to the impact of climate,there are still many temperature drop problems in high and large space places that need to be solved urgently,such as subway elevated stations,large-scale comprehensive shopping malls and public leisure areas,etc.,the use of unitized evaporative cooling air conditioning to achieve local cooling is still less At the same time,an investigation on the unit evaporative air conditioning used in the Guangdong industrial workshop found that there were still many design and application problems.Based on the above background,a unit type evaporative air conditioning for high and large space places is designed from the technical principles,optimization theory,field investigation,experimental research,performance testing and other aspects,and related research is conducted.（1）Analysis of technical principles and optimization theory.By summarizing the existing forms,the unitary evaporative air conditioners are classified from the aspects of heat exchanger form,cooling method,and structural design,and their characteristics and applicable places are compared.Combined with the characteristics of high and large space buildings,theories of adiabatic mixing are used to carry out The analysis provides a theoretical basis for the optimization design of each functional section and structure of the unit evaporative cooling air conditioner.（2）Site investigation.Surveyed a number of industrial production workshops in Guangdong and summarized the ventilation and cooling measures commonly used in industrial workshops.Investigate and test the industrial workshops that use unitized evaporative air conditioning for ventilation and cooling,and analyze their application effects.Combined with the investigation,the problems of high humidity and accelerated oxidation of electronic equipment,and poor cooling effect of overhead evaporative cooling air conditioning units are analyzed and discussed in detail,and corresponding optimization and improvement measures are proposed,As the workshop is a place with more dense and diverse pollutants,the feasibility and optimization of the air supply and exhaust system in the workshop is proposed in combination with the principle of air flow organization.（3）Design calculation.Based on the design of the subway elevated station,combined with the meteorological parameters of Xi’an,Chongqing,and Tianjin,and the above-mentioned optimization design theory,the optimal design and calculation of the floor-standing unit evaporative air conditioning was carried out,and the equipment was determined to be in and out of the wind.It is set on all four sides.The air outlet adopts spherical air outlet to realize long-distance air supply.The size of the equipment is 1m * 1m * 1.8m,the air volume is9000m3 / h,and the fan power is 1.2k W.（4）Experimental research and performance testing.Co-designed and manufactured experimental prototypes with the "industry-industry-research" cooperation unit.First,the experimental research in the second half of the transition period was conducted in the canteen of a university in Xi’an.It can still achieve 4～5℃ temperature drop under the conditions of small wet and dry bulb temperature differences and high relative humidity The best inlet air speed is 1.4 ～ 1.7m/s,the measured air volume is 5000m3/h <9000m3/h,the first generation prototype is optimized and improved.In the hot summer season,the Tianjin Metro experimental study of the second-generation unit-type evaporative cooling air conditioner has been improved in terms of equipment air volume and range after optimization.After the optimization,the equipment can meet the air volume of 9000 m3 / h and the range of 4～9m,and can meet the temperature drop of 8 ～ 9℃ under the extreme conditions close to 40 ℃.In the transition season,.it Can achieve 4～5 ℃ temperature drop.There are 60 figures,18 tables and 65 references in this paper. |
