The Influence Analysis Of Evaporative Cooling Air Conditioner Refrigeration Capicity By Outdoor Climatic Conditions

The “Eleventh five-year plan”of our country provides a good oportunity makingthe old-style evaporative cooling air conditioning technology develop rapidly,andradiate new vitality. The evaporative cooling team of Xi’an Polytechnic universitydoes a lot work and has achieved gratifying results on it. This topic tries to makefurther research on the basis of previous studies. As we all know, evaporative coolingair conditioning gets widely recognized by its energy-saving, environmentalprotection, high efficiency and so on. However, nothing is perfect includingevaporative cooling air conditioning technology, such as its application is influencedgreatly by outdoor climatic conditions. Then how the weather conditions affectevaporative cooling air conditioning is still to be studied further at present. Thisarticle outputs refrigerating parameters of evaporative cooling air conditioning as abreakthrough point,and analysis the aspects to evaporative cooling air conditioningwith the changing outdoor air condintions. Some work has been done by thefollowings.In the first, on the base of evaporative cooling air conditioning characteristics andselection and its refrigeration principle and evaporative cooling air conditioningrefrigerating capacity formula we know, the change of refrigerating capacity withoutdoor air dry bulb temperature and wet bulb temperature, relative humidity,moisture content, atmospheric pressure, and the variation of the parameters areanalized qualitatively. The results show that with the higher dry bulb temperature,the lower wet bulb temperature and relative humidity, and the smaller outdoor airatmosphere pressure, and the evaporative cooling air conditioning refrigeration ismuch better.and then the refrigerating capacity of evaporative cooling airconditioning equipment is more abundant.In the second, with the data source of Chinese building thermal environmentspecial data and on behaf of the city of Urumqi (dry area), Xi’an City(moderatehumidity area), Fuzhou (high humidity area), and analysis the effects quantitativelyof evaporative cooling air-conditioning refrigeration in defferent climatic regions and three consecutive month(June, July, August) of outdoor climatic conditions onthe same station for50000m3/h equipment. The result shows that average dry bulbtemperature changes1℃, Urumqi, Fuzhou, Xi’an sensible heat cooling capacitychange of17.9kW,10.2kW,12.9kW respectively, and the extent of change is15.5%,19.1%,37%; Average daily wet-bulb temperature change for every1℃, the coldload changes in15.6kW,15.6kW,15.7kW respectively, and the magnitude ofchange is13.4%,31.3%,52.6%; Each of1%relative humidity change, sensible heatcooling capacity changes of9.9kW,3.1kW,2.7kW respectively, and the magnitudeof change is6.3%,10%,8.2%; Moisture content change for every1g/kg, sensibleheat cooling capacity change is29.2kW,19.3kW,14.2kW, and the change rate is25.7%,33.3%,43.8%; The last one, vapor pressure change for every10Pa, sensibleheat cooling load changes in12.3kW,3.9kW,18.9kW respectively, and themagnitude of change is1.1%,1.2%,5.2%.Then, the different climate regions of the city on behalf of the direct evaporativecooling heat cold volumes are compared. The results show that the direct evaporativecooling in the dry areas， medium humidity areas and in high humidity areas of theapplication process, and the same equipment has a lot of attenuation about the coldload quantity. Urumqi the dry area is as a reference, Fuzhou, Xi’an calculateattenuation quantity is47%and72%in June,54%and60%in July, and53%and66%in August. Once again, the different climate regions representing each city witha proposed protocol for50000m3/h air of the indirect evaporative coolingair-conditioning refrigeration volume change are compared, and the results show that,when the second/first air ratio from0.5to1change process, the second side airevery increase10%volume, Urumqi Fuzhou, Xi’an, indirect evaporative cooling isto increase the percentages about15%,11.5%,9.8%. What`s more, on the dry areaof Urumqi, usually dry bulb temperature changes on the equipment cold quantityinfluence played a leading role in the area of Xi’an; Humidity and high humidityregion such as Xi`an and Fuzhou, wet and dry bulb temperature common effects onevaporation cooling equipment refrigeration volume changes, and the wet bulbtemperature effect more.In the last, a combined evaporative cooling air conditioning unit on directevaporative cooling and indirect evaporative cooling section are tested with theexisting experimental study on resource, at a company of Xi’an city. The test resultsshow that, the refrigerating capacity of direct evaporative cooling segment has a large diversification with dry and wet bulb temperature changes.Outdoor air dry andwet bulb temperature change of1degrees and the refrigeration quantity change inthe amplitude is5.7%,15.2%. The indirect evaporative cooling section is processedair inlet dry, wet bulb temperature change for every1℃, and the cooling capacity ofaltering the amplitude is24.6%,34.3%.