化学工程
化學工程
화학공정
CHEMICAL ENGINEERING
2014年
7期
37-41
,共5页
朱康玲%于飞%戴建军%赵福臣%秦国民%范敦贵
硃康玲%于飛%戴建軍%趙福臣%秦國民%範敦貴
주강령%우비%대건군%조복신%진국민%범돈귀
蒸发式空冷器%传质%强化传热%传热系数
蒸髮式空冷器%傳質%彊化傳熱%傳熱繫數
증발식공랭기%전질%강화전열%전열계수
evaporative air coolers%mass transfer%enhanced heat transfer%heat transfer coefficient
蒸发式空冷器是由换热盘管、循环水泵和风机等组成的一个复杂系统，系统内部各部件相互影响，优化组合对强化传热至关重要。实验研究了循环水泵频率、风机频率、管内流体进口温度和热水泵频率等因素对蒸发式空冷器传热性能的影响。结果表明：管内流体进口温度增加时，传热速率和管外联合传热系数均呈现持续增加的趋势；热水泵频率增加时，管外联合传热系数基本没有变化，但传热速率随之增加，增加到一定程度后趋于稳定不变；循环水泵和风机频率的变化对传热性能的影响并非简单的正相关关系，二者存在一个最佳的耦合；当管内流体进口温度为50℃时，实验确定在循环水泵频率为30 Hz，风机频率为45 Hz，热水泵频率为42 Hz时，系统的传热性能达到最优。对管外联合传热系数的研究，简化了工艺计算过程。研究结果为蒸发式空冷器的优化设计，以及节能优化操作提供了一定的依据。
蒸髮式空冷器是由換熱盤管、循環水泵和風機等組成的一箇複雜繫統，繫統內部各部件相互影響，優化組閤對彊化傳熱至關重要。實驗研究瞭循環水泵頻率、風機頻率、管內流體進口溫度和熱水泵頻率等因素對蒸髮式空冷器傳熱性能的影響。結果錶明：管內流體進口溫度增加時，傳熱速率和管外聯閤傳熱繫數均呈現持續增加的趨勢；熱水泵頻率增加時，管外聯閤傳熱繫數基本沒有變化，但傳熱速率隨之增加，增加到一定程度後趨于穩定不變；循環水泵和風機頻率的變化對傳熱性能的影響併非簡單的正相關關繫，二者存在一箇最佳的耦閤；噹管內流體進口溫度為50℃時，實驗確定在循環水泵頻率為30 Hz，風機頻率為45 Hz，熱水泵頻率為42 Hz時，繫統的傳熱性能達到最優。對管外聯閤傳熱繫數的研究，簡化瞭工藝計算過程。研究結果為蒸髮式空冷器的優化設計，以及節能優化操作提供瞭一定的依據。
증발식공랭기시유환열반관、순배수빙화풍궤등조성적일개복잡계통，계통내부각부건상호영향，우화조합대강화전열지관중요。실험연구료순배수빙빈솔、풍궤빈솔、관내류체진구온도화열수빙빈솔등인소대증발식공랭기전열성능적영향。결과표명：관내류체진구온도증가시，전열속솔화관외연합전열계수균정현지속증가적추세；열수빙빈솔증가시，관외연합전열계수기본몰유변화，단전열속솔수지증가，증가도일정정도후추우은정불변；순배수빙화풍궤빈솔적변화대전열성능적영향병비간단적정상관관계，이자존재일개최가적우합；당관내류체진구온도위50℃시，실험학정재순배수빙빈솔위30 Hz，풍궤빈솔위45 Hz，열수빙빈솔위42 Hz시，계통적전열성능체도최우。대관외연합전열계수적연구，간화료공예계산과정。연구결과위증발식공랭기적우화설계，이급절능우화조작제공료일정적의거。
The evaporative air cooler is a complex system whose essential components comprise heat exchanger pipe coil,circulation water pump and fan.As these essential components interact within the system,the optimal combination of which is significant for heat transfer enhancement.The effects of circulation water pump frequency, fan frequency,inlet temperature and fluid rate of the process fluid on the heat transfer performance of evaporative air coolers were experimentally studied.The results show that the heat transfer rate and united heat transfer coefficient outside the tubes all increase continuously with the inlet temperature of the process fluid rising.When the hot water pump frequency increases,the united heat transfer coefficient outside the tubes is unchanged,but the heat transfer rate accordingly increases to a certain extent,then remains stable.The effects of circulation water pump and fan frequencies on the heat transfer performance are not a simple positive correlation,and there exists an optimal coupling.When the inlet temperature of the process fluid is 50 ℃,the optimum heat transfer performance can be obtained as the circulation water pump frequency,the fan frequency and the hot water pump frequency are 30,45,42 Hz respectively.The concept of united heat transfer coefficient outside the tubes was presented and researched,which simplified the process calculation.The results provide the basis for the optimal design and operation of evaporative air coolers.
