Experimental Study On Vertical Tube Type Indirect-target Type Nozzle Compound Evaporative Air Conditioning Unit

At present, the technology has mature lie tubular indirect evaporative cooler, with small flow resistance, in thermal efficiency is relatively stable, the advantages of the lower cost and simpler processing method, has been widely applied in the practical engineering. However, in the sand and the serious air dust concentration is higher in the region and places in the horizontal tube type indirect evaporative cooler is still easy to plug,difficult to clean, covering an area of large defects such as short life and level. In vertical arrangement of light textile workshop, this paper tube heater, in view of the horizontal tube type indirect evaporative cooling pig of some deficiencies, vertical tube type indirect evaporative cooler is put forward. Use its special port Settings to reduce the horizontal area,and blockage of the heat exchanger for relief. At the same time, in view of the textile workshop now open source throttling, the air conditioning system to save money and improve the dilemma of the workers work environment, put forward riser-target type nozzle compound indirect evaporative cooling air conditioning unit.First of all, the use of indirect evaporative cooling equipment already set the vertical tube type indirect evaporative cooler test bench, using testo480 multi-function meter, testo instruments such as temperature and humidity recording instrument, opposite of the tubular indirect evaporative cooler cooling performance in the experiment, and summing up experience for future design. After the test, under the dry areas of meteorological parameters, the simulation of the vertical tube type indirect evaporative cooler has good cooling performance, maximum temperature 9.2℃, the highest in thermal efficiency is62.4%; Optimal quadratic/an air volume ratio 0.7, the best water spray density of 419kg/(m·h). At the same time, summed up the vertical tube type indirect evaporative cooler should use of large diameter circular tube, heat exchange tube and a tube water distribution mode of water directly.Rated design air volume of 10000m3/h of riser- target type nozzle compound indirect evaporative cooling air conditioning unit of experimental prototype, using the logarithmic mean temperature difference method opposite tubular indirect evaporative cooler design calculation, using the mature performance parameters for design and calculation of the fluid power type water spray chamber, and the construction of the prototype production.Xianyang in shaanxi province in June to August summer actual conditions, adopt testo480 multi-function meter, testo instruments such as temperature and humidity recording instrument of experimental prototype for testing.(1) for the vertical tube type indirect evaporative cooler, along with the increase of an air, wet bulb efficiency graduallyreduce, the climate condition in middle humidity, when dealing with air volume of 7000m3/h, with the increase of secondary/an air volume ratio, the wet bulb efficiency from61.9% to 70.5% rise gradually, experiment condition 9.9℃ to 12.4℃ temperature drop, the best secondary air volume ratio 1.4 / time; When dealing with air volume of 11000 m3 / h,with the increase of secondary/an air volume ratio, and the wet bulb from 54.0% to 54.0%increased efficiency and experiment condition 9.2℃ to 10.8℃ temperature drop, the best secondary air volume ratio 1.0/ time; When dealing with air volume of 20000m3/h, the wet bulb efficiency range of 54.0%~56.4%, the experimental condition 6.0℃ to 6.8℃temperature drop, the best secondary air volume ratio 1.0/time; At the same time, along with the increase of dry wet bulb temperature, vertical tubular indirect evaporative cooler air temperature drop gradually increases, wet bulb efficiency increased.(2) separate open hydrodynamic type water spray chamber test, when dealing with air volume of 7200m3/h,11000m3/h, 15000m3/h, the wet bulb efficiency achieves 96%~97%, the air relative humidity is 95%~95%, air treatment temperature drop concentration between 11.9℃ to12.1℃.(3) testing machine unit, under the experimental condition, the unit average13.6 ℃ temperature drop, wet bulb efficiency is 113%.According to the actual test data, and based on year-round outdoor meteorological parameters including statistics, a textile spinning workshop in shandong zibo area and economic applicability of the unit in a shopping mall in xi ’an region of shaanxi province were analyzed.(1) in the textile spinning workshop, when the vertical tube type indirect evaporative cooler used for cooling, return air and exhaust air as a secondary air, the air conditioning system for the whole year, the best energy saving effects of 160000m3/h, for example, spinning workshop air conditioning system can save operating cost 38000 yuan,the unit investment payback period is half a year.(2) in the shopping malls and other public buildings, 200m2, for example, compared with the traditional mechanical refrigeration and air conditioning system, riser- target type nozzle compound indirect evaporative cooling air conditioning unit can save operating cost 60000 yuan, the unit adopts full fresh air at the same time, to PM2.5, VOCS, nitrogen oxide has good washing purification effect. Unit is suitable for the market, the textile and so on personnel intensive and high dust concentration in public places and industrial workshop.