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Determination criterion of defrosting condition for variable refrigerant flow air conditioning system
Tu, Qiu1,3; Xu, Jingqiang1,3; Feng, Yuhai2; Mao, Shoubo2; Guo, Defang2; He, Jianqi2
2012-05-01
Source PublicationENERGY AND BUILDINGS
Volume48Pages:61-70
Abstract

The disadvantage of the defrosting determination criterion of time-coil temperature was theoretically analyzed and experimentally verified. Considering the different characteristics of variable refrigerant flow air conditioning system (VRF AC) from the common air conditioners, the defrosting criterion model of time-coil temperature-condensation temperature has been built. In this model, there exist four temperature regions based on different frosting characteristics at different ambient temperatures, i.e., T-ao(degrees C) is an element of (-infinity, -9], (-9, 0], (0, 4], (4, 21]. The relations between the defrosting judgment temperatures and ambient temperatures have been determined by experiments. And the minimum defrosting cycle when T-ao(degrees C) is an element of (-9, 21] and T-ao(degrees C) is an element of (-infinity, -9] were respectively determined to be 60 min and 90 min by experiments. Moreover, the defrosting accumulative coefficient, the defrosting judgment time constant and the restriction of the condensation temperature have been introduced into the model. Thus the complete criterion model can avoid delayed and premature defrosting, even false defrosting and inaccessible defrosting. A large number of experiments have verified the feasibility of the model. (C) 2012 Elsevier B.V. All rights reserved.

SubtypeArticle
KeywordDefrosting Defrosting Condition Condensation Temperature Defrosting Cycle Coil Temperature
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.enbuild.2012.01.012
WOS Subject ExtendedConstruction & Building Technology ; Energy & Fuels ; Engineering
WOS KeywordSOURCE HEAT-PUMP ; REVERSE-CYCLE DEFROST ; PERFORMANCE
Indexed BySCI
Language英语
WOS SubjectConstruction & Building Technology ; Energy & Fuels ; Engineering, Civil
WOS IDWOS:000302669300007
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.giec.ac.cn/handle/344007/10189
Collection中国科学院广州能源研究所
Affiliation1.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou 510640, Guangdong, Peoples R China
2.Haier Air Conditioning Elect Co LTD, Qingdao 266510, Peoples R China
3.Chinese Acad Sci, Key Lab Renewable Energy & Gas Hydrate, Guangzhou 510640, Guangdong, Peoples R China
First Author AffilicationGuangZhou Institute of Energy Conversion,Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Tu, Qiu,Xu, Jingqiang,Feng, Yuhai,et al. Determination criterion of defrosting condition for variable refrigerant flow air conditioning system[J]. ENERGY AND BUILDINGS,2012,48:61-70.
APA Tu, Qiu,Xu, Jingqiang,Feng, Yuhai,Mao, Shoubo,Guo, Defang,&He, Jianqi.(2012).Determination criterion of defrosting condition for variable refrigerant flow air conditioning system.ENERGY AND BUILDINGS,48,61-70.
MLA Tu, Qiu,et al."Determination criterion of defrosting condition for variable refrigerant flow air conditioning system".ENERGY AND BUILDINGS 48(2012):61-70.
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