Determination method of defrosting start-time based on temperature measurements

Title
Determination method of defrosting start-time based on temperature measurements
Author
이관수
Keywords
Defrosting control; Frosting condition; Air-source heat pump; Refrigeration system; Microchannel
Issue Date
2015-05
Publisher
ELSEVIER SCI LTD
Citation
APPLIED ENERGY, v. 146, Page. 263-269
Abstract
We report a novel defrosting control method for refrigeration systems including refrigerators and heat pumps that commonly use time control or time-temperature control to determine the defrosting start-time. However, these methods do not provide accurate defrosting start-times due to variations in the operating conditions. Here, we describe the use of the effective mass-flow fraction (EMF) to determine the defrosting start-time; this method qualitatively detects variation trend of heat transfer rate based on only temperature measurements. The performance of the EMF control was compared with that of time control under varied frosting conditions of an experimental system. The time control method determined the defrosting start-time with an error of 50%, whereas the EMF control precisely determined the defrosting start-time with an error of 10%. (c) 2015 Elsevier Ltd. All rights reserved.
URI
http://www.sciencedirect.com/science/article/pii/S0306261915002561http://hdl.handle.net/20.500.11754/24669
ISSN
0306-2619; 1872-9118
DOI
10.1016/j.apenergy.2015.02.071
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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