datalist: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:2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:2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>
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<ul class="jieshao"><h1>相变载冷剂 3M氢氟醚高低温差异大</h1>
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<li class="two linex"><font>关键词：</font><span>相变载冷剂</span></li>
<li class="two"><font>发布日期：</font><span>2024-06-22</span></li>
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<span class="ssx01">包装</span><span class="ssx02">铁桶/塑料桶/玻璃瓶</span>
<span class="ssx01">颜色</span><span class="ssx02">透明</span>
<span class="ssx01">比重</span><span class="ssx02">1.3-1.9</span>
<span class="ssx01">重量</span><span class="ssx02">5kg/10kg/15kg</span>
<span class="ssx01">VOC值</span><span class="ssx02">0</span>
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载冷剂的循环是先在蒸发器中被制冷剂冷却并送至冷却设备中吸收被冷却系统的热量，然后返回蒸发器将吸收的热量传递给制冷剂，同时载冷剂重新被制冷剂冷却。<br/>载冷剂的选择：<br/>1、腐蚀小，腐蚀性越低越有利于长期安全稳定运行；<br/>2、安全性高，减少生产安全事故；<br/>3、挥发性小或不挥发，节约补充量；<br/>4、粘度低，粘度越低，动力设备功率需求越低，载冷剂的液膜厚度越薄，传热效果越好；<br/>5、比热大，比热越大,输送冷量越多。动力设备功率需求越低，冷量输送距离越远；<br/>6、导热系数高换热效率高，换热器面积小，动力设备功率需求低；<br/>7、无毒或低毒。<br/><img style="margin: auto;clear: both;display: block" src="//l.b2b168.com/2021/11/29/10/202111291055146584144.jpg" alt="相变载冷剂"/><br/>在选择载冷剂3M时需注意的问题：<br/>1、冻结温度低，必须低于制冷的操作温度；<br/>2、传热分系数大，即热导率和热容要大，而粘度要小；<br/>3、性质稳定，腐蚀性小；<br/>4、安全无毒、价格低廉；<br/>5、价格便宜，便于获得。<br/><img style="margin: auto;clear: both;display: block" src="//l.b2b168.com/2021/11/29/10/202111291055393068584.jpg" alt="相变载冷剂"/><br/>3M氟化液的物理化学性质应尽量满足下列要求：<br/>1、在使用温度范围内，不凝固、不气化；<br/>2、无毒化学稳定性好，对金属不腐蚀；<br/>3、比热大，输送一定冷量所需流量小；<br/>4、密度小，黏度小，可减少流动阻力，降低循环泵消耗功率；<br/>5、导热系数大，可减少换热设备的传热面积；<br/><img style="margin: auto;clear: both;display: block" src="//l.b2b168.com/2021/10/20/11/202110201118274967014.jpg" alt="相变载冷剂"/><br/>3M&nbsp;NOVEC&nbsp;HFE是一种无色透明且粘度低，不易燃，安全性非常高的液体。和以前的乙烷氟化液的溶剂用途一样可作为清洗溶剂，冷媒使用。<br/>我们公司一直倡导“立足根本、展望未来、品质设计、顾客至上”的服务经营理念，以质量为根、以客户为本。我们始终为商家精心服务！欢迎新老客户前来咨询。<br /><a href="http://ry2008.cn.b2b168.com/">http://ry2008.cn.b2b168.com</a>

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