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Variable Refrigerant Volume (VRV) system and the indoor fan coil unit (FCU) control comparison

6071. China; 2. HisenseHitachiAir-conditioningsysternCo. , Ltd, Qingdao266071, China) Abstract: BasedoncontrolcomparisonofVRVsystemindoorunitandfancoilunit, analysedtheirdifferences. IntronducedcontrolprincipleoftheVRVsystemandpointedoutsomeproblemsforthebetterdesignanduseoftheVRVsystem. Keywords: VRVsystem; FCUsystem; terminalequipment; control Author: everywhere (1972 a), female, Shandong Yantai, Master of Engineering, engineers, product managers, mainly in a 1:7 air-conditioning products, technical support work. (Continued from page 7) 3 Conclusion (1) at low evaporation temperatures,[link widoczny dla zalogowanych], 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, 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, especially low temperature,[link widoczny dla zalogowanych], reciprocating compressor used as an alternative refrigerant R404A, 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,[link widoczny dla zalogowanych], 2001,[link widoczny dla zalogowanych],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 ,[link widoczny dla zalogowanych], 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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