ropa ed hardy Ternary mixture R407C thermal parame

Ternary mixture R407C thermal parameters model

Source heat pump failure Ma Zhen Yang Yao Jiang Yiqiang off the most good (Harbin Institute of Technology, Harbin Institute of Municipal and Environmental Engineering] 50090) Abstract A model based on BP neural network fault diagnosis method,[link widoczny dla zalogowanych], which only comes from a large number of the actual production model instance or the knowledge of domain experts to train the neural network. Because of its fault tolerance,[link widoczny dla zalogowanych], neural network training can not only better diagnose the fault has occurred,[link widoczny dla zalogowanych], but also within a certain range has never been diagnosed with failure; simulation results show that artificial neural network based air source heat pump water unit fault diagnosis is effective. Rlultdiagnosisforair-sourceheatpumpwaterheater/chiUersAbstractThemethodoffaultdiagnosiasedonBPmodelneuralnetworkisstudied, inwhichenoughtypicalfaultsam-piesorexpertkno ~ edgeareneededtotraintheneuralnet-work. Oncetheneuralnetworktraininghasfinished,[link widoczny dla zalogowanych], itcandi-agnosenotonIYtheshownfaultutalsosomefaultsnevershownjnsomeextentbecauseofitsfaulttolerance. Thesim-ulationresultsshowthatthefaultdiagnosisforairsourceheatpumpwaterchiller/heaterbasedoRneuralnetworkisveryef-fective. Performance Analysis of screw chillers Suzu Jian Zhang Fulong Road, Ding Guoliang (Shanghai Jiaotong University, Shanghai Institute of Refrigeration and Cryogenics, 200030J Abstract screw chillers to predict the structural parameters under different conditions varying characteristics, puts forward the basic screw chiller (I type), level with economizer throttle screw chiller (Ⅱ) and the second with economizer throttle screw chiller (Ⅲ) steady-state simulation model of variable conditions, the main component models including the economy is running without the compressor, with the economy runs the compressor, condenser, electronic expansion valve and evaporator. Simulation results show that: I type chiller performance by adjusting the expansion valve can be significantly improved degree of ; Ⅱ and Ⅲ of the COP I-have significantly improved over; and optimal performance of type Ⅲ,[link widoczny dla zalogowanych], the nominal operating conditions of the COP of about 8% higher than the I-type, more stable performance under variable conditions. withconfigurationsandworkingconditions, steadystatemod. elforthreetypesofscrewchillersissetup, includingbasictypeofscchiller (TypeI), onestagecompressionchillervvitheconomizer (TypeII) andtwostagecompressionwitheconomizer (TypeIII). Simulationresultsshowthatthepe BU formanceofTypeIchillercanbeimprovedbyadjustingexpan-sionvalve.TheCOPsofbothTypeIIandTypeUlarehigherthantypeI.111etypeIIIchillerhasthebestperformanceofallthethreetypesvvi small 8% higherCOPthanthatofTypeI.Performanceanalysisofscrewchillers National Key Basic Research Development Program (6309) AbstractInordertopredi ~ performancevariationofchillers a 57 -

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