半导体制冷技术培训资料.doc

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1、半导体制冷简介一、半导体致冷原理半导体致冷又称为温差电致冷或热电致冷。具有热电能量转换特性的材料，在通过直流电时有致冷功能，因此而得名热电致冷。总的热电效应由同时发生的五种不同的效应组成，它们是：赛贝克效应、珀尔帖效应、汤姆逊效应、焦耳效应和富里叶效应。1.赛贝克效应在两种不同导体构成的回路中，如果两个接头出的温度不同，回路中有电动势存在，这种电动势就称为赛贝克电动势或温差电动势（图一）。图一赛贝克效应示意图图中△U是温差电动势，它的大小与两结点间的温差成正比，比例常数为赛贝克系数（也称为温差电动势率），其值为αab=△U/△T式中△T为两结点间的温差每种材料都有固定的

2、赛贝克系数，若用αa和αb表示这两种材料的赛贝克系数，那么由这两种材料所制成的热电偶的赛贝克系数为：αab=

3、αa－αb

4、本专业培养掌握生物技术及其产业化的科学原理、工艺技术过程和工程设计等基础理论、基本技能，能在生物工程和生物技术领域从事设计、生产、管理和新技术研究、新产品开发的工程技术人才。IsignedwiththeBankoftheqiluBankloancontract(contract)conventions,andIusescheme,Iwouldrequesttheloans(inwords)untilIopenedpersonalsettlementa

5、ccountwithyourBank(account),usesloanfor。Loanoperation,businessunitname:accountnumber:loanfundsfromthesepersonalsettlementaccountintotheaccountofapayment.Loansinaccordancewiththefollowingpaymentmethodstopay.One,lendertrusteepayment.DelegateqiluBankloanfundsoftheborrowertomeetthestipulatio

6、nofthecontractthefollowingborrowers,counterparties,commitmentfunds,regulatorycompliance,legal,andwillingtotakethepaydisputes,lossandotherconsequencesofthedelegate.PayeeaccountnumberBanknameamountpurposeII,borrowersownpaymentmethods.QiluBankaccordingtotheborrower'swithdrawalrequesttoloanf

7、undsdisburseddirectlytotheborrower'saccount,andindependentlybytheborrowerpaymentstoborrowerswhomeetthestipulationofthecontracttransactions.Iguaranteetoyourbankcontractsandotherproveofmaterialsubmittedbyrealandeffective.Wheninaccordancewithonepayment,Iagreewiththeaboveaccountwithyourbankl

8、oanfundsthatarenotusedforstoppaymentmanagement,stoppaidconfirmedbookrecordstablesingle13:liftedcheckpaynoticerecordstablesingle14:personalloanaheadofrepaymentapplicationacceptedtableRecordstablesingle15:loanlinesopened/cancellationapplicationapprovaltablerecordstablesingle16:qilucardawar

9、dletterselfloanlinescancellationapplicationapprovaltablerecordstablesingle17:loanlinescancellationapplicationapprovaltablerecordstablesingle18:qiluBankloanurgedreceivednoticerecordstablesingle19:arrived(quality)betrealrightprovedoutlibrarylistingrecordstablesingle20:housi