Details
| Original language | English |
|---|---|
| Article number | 106638 |
| Journal | International Communications in Heat and Mass Transfer |
| Volume | 142 |
| Early online date | 21 Jan 2023 |
| Publication status | Published - Mar 2023 |
Abstract
Micro-fin tube, 3-D enhanced tube and smooth tube with an inner diameter of 9.52 mm were used as test tubes to study the condensation heat transfer performance with R410A and R32 as the working fluids at different mass flow rates (150–400 kg/m2s) and vapor qualities (0.2–0.8). For R410A and R32, the heat transfer coefficient of the micro-fin tube is 2.0–2.2 times and 1.5–2.0 times that of the smooth tube, and the heat transfer coefficient of the 3-D enhanced tube is 1.4–1.5 times and 1.5–1.6 times that of the smooth tube, respectively. The micro-fin tube is effective in thinning the condensate thickness and reducing the thermal resistance. The 3-D enhanced tube promotes the generation of turbulence and droplet entrainment, which improves heat transfer of enhanced tubes. The heat transfer coefficient of R32 is greater than that of R410A due to its higher thermal conductivity, latent heat and specific heat capacity. The frictional pressure drop increases monotonically with the mass flow rate. Considering the increment in surface area and the additional pressure drop penalty, the performance evaluation factor of the enhanced tubes ranges from 0.9 to 1.4. The study presents flow pattern maps for smooth and enhanced tubes. Enhanced tubes promote the appearance of intermittent and annular flow.
Keywords
- Condensation, Enhanced heat transfer, Flow pattern, Performance evaluation, Pressure drop
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
- Chemical Engineering(all)
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: International Communications in Heat and Mass Transfer, Vol. 142, 106638, 03.2023.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - R410A and R32 condensation heat transfer and flow patterns inside horizontal micro-fin and 3-D enhanced tubes
AU - Ma, Lianxiang
AU - Liu, Xiangzeng
AU - Gao, Yu
AU - Li, Wei
AU - Wu, Zan
AU - Luo, Xing
AU - Tao, Zhi
AU - Kabelac, Stephan
N1 - Funding Information: This work was supported by the National Natural Science Foundation of China (No. 52176077 , No. 52176076 and No. 52076187 ), Taishan Scholar Project of Shandong Province (No. ts20190937 ), and Natural Science Foundation of Shandong Province (No. ZR2019QEE010 and No. ZR2020MB045 ). Zan Wu gratefully acknowledges the support of Zhejiang University Education Foundation Qizhen Scholar Foundation .
PY - 2023/3
Y1 - 2023/3
N2 - Micro-fin tube, 3-D enhanced tube and smooth tube with an inner diameter of 9.52 mm were used as test tubes to study the condensation heat transfer performance with R410A and R32 as the working fluids at different mass flow rates (150–400 kg/m2s) and vapor qualities (0.2–0.8). For R410A and R32, the heat transfer coefficient of the micro-fin tube is 2.0–2.2 times and 1.5–2.0 times that of the smooth tube, and the heat transfer coefficient of the 3-D enhanced tube is 1.4–1.5 times and 1.5–1.6 times that of the smooth tube, respectively. The micro-fin tube is effective in thinning the condensate thickness and reducing the thermal resistance. The 3-D enhanced tube promotes the generation of turbulence and droplet entrainment, which improves heat transfer of enhanced tubes. The heat transfer coefficient of R32 is greater than that of R410A due to its higher thermal conductivity, latent heat and specific heat capacity. The frictional pressure drop increases monotonically with the mass flow rate. Considering the increment in surface area and the additional pressure drop penalty, the performance evaluation factor of the enhanced tubes ranges from 0.9 to 1.4. The study presents flow pattern maps for smooth and enhanced tubes. Enhanced tubes promote the appearance of intermittent and annular flow.
AB - Micro-fin tube, 3-D enhanced tube and smooth tube with an inner diameter of 9.52 mm were used as test tubes to study the condensation heat transfer performance with R410A and R32 as the working fluids at different mass flow rates (150–400 kg/m2s) and vapor qualities (0.2–0.8). For R410A and R32, the heat transfer coefficient of the micro-fin tube is 2.0–2.2 times and 1.5–2.0 times that of the smooth tube, and the heat transfer coefficient of the 3-D enhanced tube is 1.4–1.5 times and 1.5–1.6 times that of the smooth tube, respectively. The micro-fin tube is effective in thinning the condensate thickness and reducing the thermal resistance. The 3-D enhanced tube promotes the generation of turbulence and droplet entrainment, which improves heat transfer of enhanced tubes. The heat transfer coefficient of R32 is greater than that of R410A due to its higher thermal conductivity, latent heat and specific heat capacity. The frictional pressure drop increases monotonically with the mass flow rate. Considering the increment in surface area and the additional pressure drop penalty, the performance evaluation factor of the enhanced tubes ranges from 0.9 to 1.4. The study presents flow pattern maps for smooth and enhanced tubes. Enhanced tubes promote the appearance of intermittent and annular flow.
KW - Condensation
KW - Enhanced heat transfer
KW - Flow pattern
KW - Performance evaluation
KW - Pressure drop
UR - http://www.scopus.com/inward/record.url?scp=85149732735&partnerID=8YFLogxK
U2 - 10.1016/j.icheatmasstransfer.2023.106638
DO - 10.1016/j.icheatmasstransfer.2023.106638
M3 - Article
AN - SCOPUS:85149732735
VL - 142
JO - International Communications in Heat and Mass Transfer
JF - International Communications in Heat and Mass Transfer
SN - 0735-1933
M1 - 106638
ER -