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Study on heat transfer and fluidity of three-dimensional invisible finned-tube

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Abstract

Three-dimensional invisible finned-tube is a kind of high-efficiency enhanced tube which is widely used at present. In order to study and analyze advantages and disadvantages of heat transfer and flow performance of the three-dimensional invisible finned-tube, other enhanced tube heat exchangers are introduced and compared through experiments. After analysis and research, it is found that the total heat transfer coefficient K is not the only indexes for evaluating the performance of the heat exchanger, and the resistance is also one of the indexes. According to the evaluation standard of the comprehensive performance of the heat exchanger, the comprehensive performance factor η of the tube side and shell side of the three-dimensional invisible finned-tube heat exchanger is better than that of the other enhanced tube heat exchanger, and the enhanced tube standard is reached under certain conditions, which shows that the three-dimensional invisible finned-tube heat exchanger has excellent performance. The analysis results in this paper have certain guiding significance for engineering design and application of three-dimensional invisible finned-tube heat exchanger.

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Abbreviations

P :

Pitch of heat exchange element (mm)

A :

Long axis of the three-dimensional tube (mm)

B :

Short axis of the three-dimensional tube (mm)

h :

Arc line tube groove width (mm)

d :

Diameter of the heat exchange element (mm)

L :

Length of heat exchange element (mm)

D :

Shell diameter of heat exchanger (mm)

m :

Number of heat exchange tubes (piece)

K :

Total heat transfer coefficient (W m−2 K−1)

Q :

Heat exchange power (W)

Nu:

Nusselt number of the heat exchanger (–)

Re:

Reynolds number of the heat exchanger (–)

ΔP :

Resistance loss of the heat exchanger (Pa)

f :

Resistance coefficient of the heat exchanger (–)

C :

Correction constant of convective heat transfer coefficient

Pr:

Prandtl number (–)

de:

Equivalent diameter of heat exchange element (m)

c p :

Specific heat of working fluid at constant pressure (J kg−1 K−1)

t :

Cold side temperature (K)

T :

Hot side temperature (K)

ΔT m :

Average temperature difference (K)

ΔT 1 :

Large temperature difference between hot and cold (K)

ΔT 2 :

Small temperature difference between hot and cold (K)

F :

Heat exchanger area (m2)

V :

Volume flow of working fluid (m3 s−1)

B :

Thermal resistance of tube wall (m2 K W−1)

le:

Equivalent length (m)

v :

Working fluid velocity (m s−1)

S:

Cross section of working fluid flow (m2)

f s :

Resistance coefficient of smooth tube (–)

f′ :

Resistance coefficient of enhanced element (–)

Nus :

Nusselt number of smooth tube (–)

Nu′ :

Nusselt number of enhanced element (–)

1:

Inlet

2:

Outlet

o:

Shell side of heat exchanger

i:

Tube side of heat exchanger

ALT:

Arc line tube

CDT:

Converging–diverging tube

3D:

Three-dimensional invisible finned-tube

ST:

Smooth tube

δ :

Heat exchange element thickness (mm)

η :

Comprehensive performance evaluation factor

α :

Convective heat transfer coefficient (W m−2 K−1)

λ :

Thermal conductivity of working fluid (W m−1 K−1)

ρ :

Density of working fluid (kg m−3)

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Acknowledgements

This research was supported by “Industrial Technology Major Program for Tackling Key Problems of Science and Technology Planning Projects of Guangzhou (Grant No. 201802010022)” and “Special Project of Scientific and Technological Cooperation of Chinese Academy of Sciences and Hubei Province (Grant No. 2018-916-000-009) and Opening Foundation of Key Laboratory of Renewable Energy, Chinese Academy of Sciences” and “Natural Science Foundation of Guangdong Province, No.2020A1515011318.”

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Authors and Affiliations

  1. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640, China

    X. Mo, D. S. Zhu, F. Y. Wang & Y. D. Yin

  2. Key Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou, 510640, China

    X. Mo, D. S. Zhu, F. Y. Wang & Y. D. Yin

  3. Guangdong Key Laboratory of New and Renewable Energy Research and Development, Guangzhou, 510640, China

    X. Mo, D. S. Zhu, F. Y. Wang & Y. D. Yin

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Mo, X., Zhu, D.S., Wang, F.Y. et al. Study on heat transfer and fluidity of three-dimensional invisible finned-tube. J Therm Anal Calorim 146, 449–460 (2021). https://doi.org/10.1007/s10973-020-09905-3

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