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 Wysłany: Nie 0:28, 08 Maj 2011 Temat postu: mac cosmetics discount Variable Refrigerant Volume |
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Variable Refrigerant Volume (VRV) system and the indoor fan coil unit (FCU) control comparison
6071. China; 2. HisenseHitachiAir-conditioningsysternCo. , Ltd,[link widoczny dla zalogowanych], Qingdao266071, China) Abstract: BasedoncontrolcomparisonofVRVsystemindoorunitandfancoilunit, analysedtheirdifferences. IntronducedcontrolprincipleoftheVRVsystemandpointedoutsomeproblemsforthebetterdesignanduseoftheVRVsystem. Keywords: VRVsystem; FCUsystem; terminalequipment; control Author: everywhere (1972 a), female, Shandong Yantai, Master of Engineering, engineers,[link widoczny dla zalogowanych], product managers, mainly in a 1:7 air-conditioning products, technical support work. (Continued from page 7) 3 Conclusion (1) at low evaporation temperatures, the use of R404A refrigerant R22 can be greater than the use of cooling capacity; (2) reduced to very low evaporation temperature, the use of R404A refrigerant The coefficient of performance greater than the use of R22 refrigeration coefficient; (3) the condensation temperature of the R404A system of systems larger than the R22,[link widoczny dla zalogowanych], the evaporation temperature is constant, as the condensation temperature, R404A attenuated cooling capacity of the system, The relative change R22 to gentle lot. In summary, in the medium and low temperature conditions,[link widoczny dla zalogowanych], especially low temperature, reciprocating compressor used as an alternative refrigerant R404A,[link widoczny dla zalogowanych], in terms of the current level of technology is appropriate and feasible. References: [1] CALMJM, HOURAHANGC. Refrigeramdatasummary [J】. EngineeredSystems. 2001.18 (11): 74 ~ 88. [2] Xuan Yongmei. New alternative refrigerants theoretical and experimental study of [D]: [Ph.D. Thesis]. Zhejiang University. 2004.4 ~ 14. [3] Chen Zhiguang. Thermodynamic Properties of Refrigerant Chart [M]. 1990. 『4J-volt dry spring. R404A freezer in my company's use of [J1. Cryogenics, 2001,19 (5). [5] Qin Haijie. Semi-hermetic reciprocating refrigeration compressor applications at low temperature conditions of R404A fD】: 『MS Thesis]. Xi'an Jiaotong University ,2006-10. [6] Du Xigang. Piston temperature conditions in refrigeration compressor refrigerant replacement of [D]: 【Master Thesis 1. Xi'an Jiaotong University ,2006-10. Received date :2007-03-13StudyonRefrigerantAlternationforReciprocatingRefrigerationCompressorZHANGHua-jun, CHENXiao-kang, QINHai-jie, DUXi-gangz, WENYe (J. CollegeofEnergyandPowerEn ~ needng, Xi'anJiaotongUniversity, Xi , China) Abstract: Acontrastexperimentonreciprocatingcompressorcarriedout, usingbothR404AandR22. ThroughthestudyofthisexperimentanalyzedthefeasibilityofreplacingR22withR404A. Keywords: R404A; experimentalstudy; semi-hermeticreciprocatingrefrigerationcompressor Author: Zhang Huajun (1962 a), male, Hanzhong, professors, mainly in refrigeration and air conditioning technology research. 24l volume Bo
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