Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 749-762 |
| Number of pages | 14 |
| Journal | HVAC and R Research |
| Volume | 14 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2008 |
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Experimental study of the flow of R-134a through an adiabatic helically coiled capillary tube. / Khan, M.K.; Kumar, R.; Sahoo, P.K.
In: HVAC and R Research, Vol. 14, No. 5, 2008, p. 749-762.Research output: Contribution to journal › Article
TY - JOUR
T1 - Experimental study of the flow of R-134a through an adiabatic helically coiled capillary tube
AU - Khan, M.K.
AU - Kumar, R.
AU - Sahoo, P.K.
N1 - Cited By :8 Export Date: 19 June 2018
PY - 2008
Y1 - 2008
N2 - An experimental investigation was carried out to evaluate the flow characteristics of refrigerant R-134a through an adiabatic helically coiled capillary tube. The effect of various physical parameters like diameter and length of capillary tube, coil pitch, and inlet subcooling on the mass flow rate of R-134a was investigated. Moreover, the refrigerant mass flow rate through an instrumented capillary tube was also compared to that through a noninstrumented capillary tube. It was found that the provision of taps for pressure measurement on the capillary tube surface has a negligible effect on the mass flow rate of R-134a. Further, the coil pitch had a significant effect on the performance of the adiabatic helically coiled capillary tube. It was established that the coil pitch significantly influenced the mass flow rate through the adiabatic helically coiled capillary tube. It was concluded that the effect of coiling of the capillary tube reduces the mass flow rate by 5% to 15%, as compared to those of the straight capillary tube operating under similar conditions. The data obtained from the experiments were analyzed, and a semi-empirical correlation was developed. Almost 97% of the mass flow rate predicted by the proposed correlation lies in the error band of ±10%. © 2008 American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.
AB - An experimental investigation was carried out to evaluate the flow characteristics of refrigerant R-134a through an adiabatic helically coiled capillary tube. The effect of various physical parameters like diameter and length of capillary tube, coil pitch, and inlet subcooling on the mass flow rate of R-134a was investigated. Moreover, the refrigerant mass flow rate through an instrumented capillary tube was also compared to that through a noninstrumented capillary tube. It was found that the provision of taps for pressure measurement on the capillary tube surface has a negligible effect on the mass flow rate of R-134a. Further, the coil pitch had a significant effect on the performance of the adiabatic helically coiled capillary tube. It was established that the coil pitch significantly influenced the mass flow rate through the adiabatic helically coiled capillary tube. It was concluded that the effect of coiling of the capillary tube reduces the mass flow rate by 5% to 15%, as compared to those of the straight capillary tube operating under similar conditions. The data obtained from the experiments were analyzed, and a semi-empirical correlation was developed. Almost 97% of the mass flow rate predicted by the proposed correlation lies in the error band of ±10%. © 2008 American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.
U2 - 10.1080/10789669.2008.10391037
DO - 10.1080/10789669.2008.10391037
M3 - Article
VL - 14
SP - 749
EP - 762
JO - Science and Technology for the Built Environment
JF - Science and Technology for the Built Environment
SN - 2374-4731
IS - 5
ER -