Abstract
Air-conditioners use a spirally coiled capillary tube as an expansion device to enhance compactness of the unit. However, most empirical correlations in open literature were developed for straight capillary tubes without considering coiled effects on the mass flow rate. The objectives of this study are to investigate the flow characteristics of coiled capillary tubes and to develop a generalized correlation for mass flow rate through coiled capillary tubes. The mass flow rates through the coiled capillary tubes and straight capillary tubes were measured by varying operating conditions and tube geometry. The condensing temperatures varied at 40.5, 47.5 and 54.5°C, and subcoolings altered at 3.5, 6.5 and 11.5°C. The mass flow rates of the coiled capillary tubes decreased by 5 to 16% compared with those of the straight capillary tubes at the same operating conditions. An empirical correlation was developed by introducing equivalent length of capillary tube with non-dimensional parameters for coiled shape. The present correlation predicts the data with average and standard deviations of 0.33% and 3.24%, respectively.
| Original language | English |
|---|---|
| Pages (from-to) | 91-98 |
| Number of pages | 8 |
| Journal | Transactions of the Korean Society of Mechanical Engineers, B |
| Volume | 31 |
| Issue number | 1 |
| Publication status | Published - 2007 Jan 1 |
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Keywords
- Coiled capillary tube
- Empirical correlation
- Expansion device
- Mass flow rate
ASJC Scopus subject areas
- Mechanical Engineering
Cite this
An empirical correlation of refrigerant flow rate through coiled capillary tubes. / Park, Chasik; Jang, Yonghee; Kim, Yong Chan; Lee, YoungSoo.
In: Transactions of the Korean Society of Mechanical Engineers, B, Vol. 31, No. 1, 01.01.2007, p. 91-98.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - An empirical correlation of refrigerant flow rate through coiled capillary tubes
AU - Park, Chasik
AU - Jang, Yonghee
AU - Kim, Yong Chan
AU - Lee, YoungSoo
PY - 2007/1/1
Y1 - 2007/1/1
N2 - Air-conditioners use a spirally coiled capillary tube as an expansion device to enhance compactness of the unit. However, most empirical correlations in open literature were developed for straight capillary tubes without considering coiled effects on the mass flow rate. The objectives of this study are to investigate the flow characteristics of coiled capillary tubes and to develop a generalized correlation for mass flow rate through coiled capillary tubes. The mass flow rates through the coiled capillary tubes and straight capillary tubes were measured by varying operating conditions and tube geometry. The condensing temperatures varied at 40.5, 47.5 and 54.5°C, and subcoolings altered at 3.5, 6.5 and 11.5°C. The mass flow rates of the coiled capillary tubes decreased by 5 to 16% compared with those of the straight capillary tubes at the same operating conditions. An empirical correlation was developed by introducing equivalent length of capillary tube with non-dimensional parameters for coiled shape. The present correlation predicts the data with average and standard deviations of 0.33% and 3.24%, respectively.
AB - Air-conditioners use a spirally coiled capillary tube as an expansion device to enhance compactness of the unit. However, most empirical correlations in open literature were developed for straight capillary tubes without considering coiled effects on the mass flow rate. The objectives of this study are to investigate the flow characteristics of coiled capillary tubes and to develop a generalized correlation for mass flow rate through coiled capillary tubes. The mass flow rates through the coiled capillary tubes and straight capillary tubes were measured by varying operating conditions and tube geometry. The condensing temperatures varied at 40.5, 47.5 and 54.5°C, and subcoolings altered at 3.5, 6.5 and 11.5°C. The mass flow rates of the coiled capillary tubes decreased by 5 to 16% compared with those of the straight capillary tubes at the same operating conditions. An empirical correlation was developed by introducing equivalent length of capillary tube with non-dimensional parameters for coiled shape. The present correlation predicts the data with average and standard deviations of 0.33% and 3.24%, respectively.
KW - Coiled capillary tube
KW - Empirical correlation
KW - Expansion device
KW - Mass flow rate
UR - http://www.scopus.com/inward/record.url?scp=34250756991&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=34250756991&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:34250756991
VL - 31
SP - 91
EP - 98
JO - Transactions of the Korean Society of Mechanical Engineers, B
JF - Transactions of the Korean Society of Mechanical Engineers, B
SN - 1226-4881
IS - 1
ER -