从喷水室内空气与水进行热湿交换的机理入手,利用膜理论,推导热湿交 换基本方程式。在论述影响热湿交换的主要因素基础上,以热质交换系数为媒 介,引进喷水室热工计算方法—效率系数法,其中利用因次分析得到特性数的通用数学表达式。双喷系统热工计算同样采用效率系数法,进而在理论部分 引出双喷系统热工计算方程式,这实质上就得到了本课题的核心部分—组合方程组,无论是理论计算还是喷水室结构类型的采用以及试验公式的确定均以 此为核心,从而最终从理论计算、试验测定及节能性三方面论证了双喷水室热 回收方案的可行性。 双喷水室热回收系统可行性的衡量标准为一定质量风速及喷水系数下的 热回收率。理论计算中通过编制的Fortran程序求解组合方程组,并结合 HVAC一id图求得符合要求的热回收率,其间试验公式是在单喷水室的基础上采 用一次正交回归试验设计得到,试验结果是通过对运行的双喷系统中的室内外 空气进出口状态参数进行测定而得到。试验用喷水室设备使用自行设计加工的 一种流体撞击式喷水室。对理论计算及试验测定结果进行对比分析,一方面分 析共有变化规律,以说明组合方程组较能准确描述实际处理过程的条件,从而 验证组合方程组的合理性程度;另一方面分析误差产生原因,提出改进方法。 无论是理论计算还是试验测定均是在绘制热回收率叮一喷水系数产及热 回收率叮一质量风速vP的情况下做出方案是否可行的判断,并据此提出断面 质量风速及喷水系数优化设计的必要性观点。 关键词:双喷水室热回收率流体撞击式喷水室试验公式西南交通大学硕士研究生学位报告第II页 Abstr8Ct Fromtheheatandh切rnidity,5exchangePrineiPlebe七刀eentheairandtheWater intheSPrayehamber,utili滋ngthefilmtheo以inducingtheheatandhumidity,s exehangePrim田了equations.功加ducingthethermalpe而rmaneeealeulation methodealledeffieientfaCtormethodwiththemediumoftheexehangeeoeffieient onthebaseofthekeyfactorswhichidueneingtheheatandhumidity,5exehange, theeharactersordinaryMal上ematiesequatlonsstemfromtheanalysisThedouble spraveh剐mber’5thermal讲而rmanceealeu一ationidentie时lyutilizin宕’emeient factormethod,丘川由erTheeq娜ationsworkingastheeoreofthetheoryealeulation 阶dtheutiliZationofthesPrayehamber,5stluetUreandthedefinitionofthe experimentalequations,允dherIntroducingthedoublesPrayeh田的ber,5thermal performancecalculationequations.Demonstlatingthefeasibilityofthedouble sPrayehamber,5heatreeoveryinthefieldsofthetheoryealeulationandthe exPerimentaldeterminationandtheenergy一saving朋aiysis. 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The拼ojectfeasibilityjudging斤omboth小e粉一产and叮一vPgaPhs whethertheoryealculationorexperimentalte线aceo记ingtowhieh,Puttingfo户刀ard theideasoftheProceedingdesi娜ngquantityvelocityandsPrayfactor.西南交通大学硕士研究生学位报告第111页 Keywords:double.sP.LychaJ叮berheatrecoveryrate experimentalequatfons fluid一striking sP仆lych剐.忱r西南交通大学硕士研究生学位报告第Iv页 目录 第l章绪论.................................................................................................1 1.1概述............,.................................................................................1 1.2常见热回收系统................................................................................1 1.3已有全热交换器的应用限制.............................................................3 1.4双喷水室热回收系统的提出............................................................4 1,4.1单级双喷热回收系统..................................................................4 1.4.2热回收率计算................................................,5 1.4.3单级双喷系统热回收率变化的两种情况.....................,.....6 1.4.4双级双喷系统.…,.......................................................7 1.5本课题的目标和意义........................8 第2章理论研究.......,.....、.................................................11 2.1喷水室内空气一水热湿交换过程..................................................11 2.1.1传递模型................................................................,...........11 2.1.2动量、能量和质量传递的基本规律........................................n 2,1.3空气一水热湿交换原理.....,........,.................................13 2.2喷水室热工计算.......................,..........................14 2.2.1空气与水表面之间热质交换基本方程式...............................14 2,2.2影响空气与水表面之间热质交换的主要因素........................16 2.2.3热质交换系数与各影响因素的关系........................................21 2.2.4喷水室效率公式..........................................................22 2么5喷水室热工计算方程式............................................................27 2.3双喷水室热工计算.................,.........,....,...,....28 2.3.1组合方程组...............................................,..............28 2.3.2组合方程组在理论计算中的作用............................................29 第3章试验研究....................................................................................33 3.1流体撞击式喷水室..........................................................................33 3.1.1雾化机理....................................................................................33西南交通大学硕士研究生学位报告第v页 3.1.2结构特点....................................................................................33 3.2试验装置...........................................................................................34 3.2.1试验台主要设备简介................................................................35 3.2.2测量仪表....................................................................,.........35 3.3试验方法...........................................................................................36 3.4试验条件...........................................................................................36 3.5热交换效率系数及接触系数试验公式的确定...............................37 3.5.1试验方法简介.................................................................37 3.5.2试验装置....................................................................................38 3.5.3试验设计及试验公式的确定....................................................38 3.5.4试验条件....................................................................................41 第4章试验结果与理论计算的对比分析...........,.............................42 4 . 1喷水系数对热回收率的影响.,..................................................42 4.2断面风速对热回收率的影响...........................................................43 4.3理论计算与试验结果的误差分析...................................................43 第5章双喷水室热回收系统节能分析.............................................,..…45 结论................................................................................,........................47 致谢....................................................................,....................................49