datalist:10数据库“tempdb”的事务日志已满，原因为“ACTIVE_TRANSACTION”。   在 System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   在 System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
   在 System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
   在 System.Data.SqlClient.SqlDataReader.TryConsumeMetaData()
   在 System.Data.SqlClient.SqlDataReader.get_MetaData()
   在 System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString, Boolean isInternal, Boolean forDescribeParameterEncryption, Boolean shouldCacheForAlwaysEncrypted)
   在 System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, Boolean inRetry, SqlDataReader ds, Boolean describeParameterEncryptionRequest)
   在 System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry)
   在 System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
   在 System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)
   在 System.Data.SqlClient.SqlCommand.ExecuteReader()
   在 B2b.Shop.ShopBase.GetDataList(Int32 iValue, Int32 iSize, List`1& loValues) 位置 f:\mywork\b2b168\b2bweb\B2bBase\ShopBase.cs:行号 4543datalist:8数据库“tempdb”的事务日志已满，原因为“ACTIVE_TRANSACTION”。   在 System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   在 System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
   在 System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
   在 System.Data.SqlClient.SqlDataReader.TryConsumeMetaData()
   在 System.Data.SqlClient.SqlDataReader.get_MetaData()
   在 System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString, Boolean isInternal, Boolean forDescribeParameterEncryption, Boolean shouldCacheForAlwaysEncrypted)
   在 System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, Boolean inRetry, SqlDataReader ds, Boolean describeParameterEncryptionRequest)
   在 System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry)
   在 System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
   在 System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)
   在 System.Data.SqlClient.SqlCommand.ExecuteReader()
   在 B2b.Shop.ShopBase.GetDataList(Int32 iValue, Int32 iSize, List`1& loValues) 位置 f:\mywork\b2b168\b2bweb\B2bBase\ShopBase.cs:行号 4543datalist:5数据库“tempdb”的事务日志已满，原因为“ACTIVE_TRANSACTION”。   在 System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   在 System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
   在 System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
   在 System.Data.SqlClient.SqlDataReader.TryConsumeMetaData()
   在 System.Data.SqlClient.SqlDataReader.get_MetaData()
   在 System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString, Boolean isInternal, Boolean forDescribeParameterEncryption, Boolean shouldCacheForAlwaysEncrypted)
   在 System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, Boolean inRetry, SqlDataReader ds, Boolean describeParameterEncryptionRequest)
   在 System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry)
   在 System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
   在 System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)
   在 System.Data.SqlClient.SqlCommand.ExecuteReader()
   在 B2b.Shop.ShopBase.GetDataList(Int32 iValue, Int32 iSize, List`1& loValues) 位置 f:\mywork\b2b168\b2bweb\B2bBase\ShopBase.cs:行号 4543<!DOCTYPE html>
<html lang="zh-cn">
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<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
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<meta name="description" content="LC1-3.5L/L液压站冷却器, 在化工和石油化工厂中，传热既是较重要也是应用较多的过程。工厂运转是否经济常常取决于热或冷的利用和回收的效率。供气、供电和供冷等公用工程在生产过程中的应用，关键在于使热的转化和回收效率较高。换热器是在..。获取更多LC1-3.5L/L液压站冷却器相关供求信息，请查阅无锡乾锐锋液压科技有限公司网站供应商机栏目" />
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  "description":"LC1-3.5L/L液压站冷却器, 在化工和石油化工厂中，传热既是较重要也是应用较多的过程。工厂运转是否经济常常取决于热或冷的利用和回收的效率。供气、供电和供冷等公用工程在生产过程中的应用，关键在于使热的转化和回收效率较高。换热器是在..。获取更多LC1-3.5L/L液压站冷却器相关供求信息，请查阅无锡乾锐锋液压科技有限公司网站供应商机栏目",
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<h1 title="LC1-3.5L/L液压站冷却器">LC1-3.5L/L液压站冷却器</h1>
<div class="time"><span>更新时间：2024-06-22 &nbsp; 浏览数：56</span><br />
所属行业：<a href="http://info.b2b168.com/nuantongkongtiao/" target="_blank">暖通空调</a> <a href="http://info.b2b168.com/nuantongkongtiao/lengdonglengcang/" target="_blank">冷藏/冷冻设备</a> <a href="http://info.b2b168.com/nuantongkongtiao/lengdonglengcang/huanrelengque/" target="_blank">换热器/冷却器</a> </div>
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发货地址：江苏省无锡   &nbsp;<br />
产品规格：LC1-3.5L/L液压站冷却器<br />产品数量：134.00台<br />
包装说明：纸箱<br /><span class="">    价格：￥<i>1.00</i> 元/台 起</span><br />
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<span class="ssx01">产品规格</span><span class="ssx02">LC1-3.5L/L液压站冷却器</span><span class="ssx01">包装说明</span><span class="ssx02">纸箱</span><span class="ssx01">驱动方式</span><span class="ssx02">电机</span>
<span class="ssx01">结构原理</span><span class="ssx02">冷却器</span>
<span class="ssx01">级数</span><span class="ssx02">4级/6级</span>
<span class="ssx01"></span><span class="ssx02">乾锐锋</span>
<span class="ssx01">压力</span><span class="ssx02">2.5</span>
<span class="ssx01">高压力</span><span class="ssx02">3</span>
<span class="ssx01">流量</span><span class="ssx02">800L/min</span>
<span class="ssx01">螺纹</span><span class="ssx02">英制</span>
</div>
<span>在化工和石油化工厂中，传热既是较重要也是应用较多的过程。工厂运转是否经济常常取决于热或冷的利用和回收的效率。供气、供电和供冷等公用工程在生产过程中的应用，关键在于使热的转化和回收效率较高。</span><br><span><br></span><br><span>换热器是在具有不同温度的两种和两种以**体之间传递热量的设备。在工业生产中，换热器的主要作用是使热量由温度较高的流体传递给温度较低的流体，使流体温度达到工艺流程规定的指标，以满足过程工艺条件的需要。换热器是化工、炼油、动力、食品、轻工、原子能、制药，航空及其他许多工业部门广泛使用的通用设备。在化工厂中，换热器的投资约占总投资的10%~20%；在炼油厂中，该项的投资约占总投资的35%~40%。</span><br><span><br></span><br><span>换热器的种类很多，有多种多样的结构每种结构形式的换热器都有其自身的结构特征及其相应的工作特性。在对换热器的选型时，有诸多因素需要考虑，主要包括流体的性质、压力、温度、压降及其可调范围；对清洗、维修的要求；材料价格及制造成本；动力消耗费；现场安装和检修的方便程度；使用寿命和可靠性等。对于所选择的换热器，应尽量满足以下要求：具有较高的传热效率，较低的压力降；重量轻且能承受操作压力；有可靠的使用寿命；产品质量高，操作安全可靠；所使用的材料与过程流体相容；设计计算方便，制造简单，安装容易，易于维护和维修。</span><br><span><br></span><br><span>在换热器中，应用较多的是管壳式（列管式）换热器，它是工业过程热量传递中应用较广泛的一种换热器。虽然列管式换热器在结构紧凑型、传热强度和单位传热面积的金属消耗量方面无法与板式或板翅式等紧凑式换热器相比，但列管式换热器适用的操作温度与压力范围较大，制造成本低，清洗方便，处理量大，工作可靠，长期以来，人们已在其设计和加工制造方面积累了许多的经验。</span><br><span><br></span><br><span>本次课程设计是根据生产任务要求确定选用换热器的传热面积，管子规格和排列方式，管程数和管壳数以及折流挡板，进而确定换热器的其他尺寸或选择换热器的型号。</span><br><span>列管式换热器类型的选择</span><br><span><img src="//l.b2b168.com/2021/07/03/10/202107031050486423274.jpg"><br></span><br><span></span><br><span><br></span><br><span>根据列管式换热器的结构特点，常将其分为固定管板式、浮头式、U形管式</span><br><span><br></span><br><span>填料函式、滑动管板式、双管板式、薄管板式等类型。</span><br><span><br></span><br><span>2.1.1 固定管板式换热器(代号G)</span><br><span><br></span><br><span>优点：结构简单、紧凑、能承受较高的压力，造价低，管程清洗方便，管子损坏时易于堵塞或换；</span><br><span><br></span><br><span>缺点：管束与壳体的壁温或材料的线膨胀系数相差较大时，壳体和管束中将产生较大的热应力</span><br><span><br></span><br><span>这种换热器适用于壳层介质清洁且不易结垢、并能进行清洗、管程与壳程两侧温差不大或者温差较大但壳层压力不高的场合。</span><br><span><img src="//l.b2b168.com/2021/07/03/10/202107031050486995094.jpg"><br></span><br><span>2.1.2 浮头式换热器(代号P)</span><br><span><br></span><br><span>优点：管内和管间易于清洗，不会产生热应力；</span><br><span><br></span><br><span>缺点：结构复杂，造价比固定管板式换热器高，设备笨重，材耗量大，且浮头端小盖在操作中无法检查，制造时对密封要求高。</span><br><span><br></span><br><span>这种换热器适用于壳体和管束之间壁温差较大或壳程介质易结垢的场合。</span><br><p><img src="//l.b2b168.com/2021/07/07/10/202107071014448916774.jpg"></p><p><img src="//l.b2b168.com/2021/07/07/10/202107071014449572244.jpg"></p><p>。</p><br /><a href="http://galon.b2b168.com/">http://galon.b2b168.com</a>
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