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Experimental studies on performance augmentation of single hole cored brick sensible heat storage system using turbulence inducers

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Abstract

This article presents experimental analysis on performance augmentation of a single hole cored brick regenerator using turbulence inducers. Experiments were carried out for different velocities with air as the working fluid for both charging and discharging processes of a 455 mm long aluminum regenerator with inner and outer diameters of 26 mm and 40 mm, respectively. Two numbers of turbulence inducers of 1.5 mm diameter and 13 mm long were placed in ten different combinations and the results were compared with the trials wherein no inducers were used. The mean temperature of the cored brick, exit temperature during discharge, ratio of heat transfer rate to pressure drop, and exergetic efficiencies are the characteristics that were used to study the performance of the regenerator. Placement of inducers increased the mean temperature of the regenerator and the ratio of heat transfer rate to pressure drop by about 15% and a maximum of 40%, respectively, during charging. The exit air temperature during discharge exhibited maximum improvement of 18%. Increased exergetic efficiencies of more than 10% and 5% were estimated for charging and discharging, respectively. It was also observed that the addition of inducers does not necessarily result in an increased performance, and some of the combinations in fact deteriorated the performance of the regenerator.

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Abbreviations

C p :

Specific heat (J kg−1 K−1)

t ch :

Charging/effective charging time (s)

t dis :

Discharging/effective discharging time (s)

ΔP :

Pressure drop (Pa)

Q str :

Energy stored by HTF during charging cycle (J)

Q rec :

Energy recovered during discharge cycle (J)

g :

Acceleration due to gravity (9.8 m s−2)

h a :

Height of a manometer column with(water)fluid (m)

v :

HTF velocity (m s−1)

T ini :

Initial temperature before manometer (K)

\(T_{\text{si}}\) :

Initial temperature of solid during charging (K)

T in :

Inlet temperature of the HTF (K)

L :

Length of the storage prototype (cored brick) (m)

T smax :

Maximum temperature of solid (K)

\(T_{\text{sm}}\) :

Mean temperature of solid during charging (K)

T RC :

Mean temperature ratio of regenerator \(\frac{{T_{{{\text{sm}}\; {\text{with}}\; {\text{inducer}}}} }}{{T_{{{\text{sm}}\; {\text{without}}\; {\text{inducer}}}} }}\)

T RD :

Mean temperature ratio of regenerator \(\frac{{T_{{{\text{out}}\;{\text{with}}\; {\text{inducer}}}} }}{{T_{{{\text{out}}\;{\text{without}}\;{\text{inducer}}}} }}\)

t :

Time (s)

T out :

Outlet temperature of the HTF (K)

ϕ :

Performance factor, Q/ΔP (W Pa−1)

ρ :

Density (kg m−3)

χ :

Exergy efficiency (%)

c:

Charging

d:

Discharging

o:

Overall

f:

Fluid

s:

Solid

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Acknowledgements

The authors sincerely express their gratitude to Coimbatore Institute of Technology (CIT), Coimbatore, India for providing necessary laboratory facilities and encouragement for this project. The authors especially thank undergraduate students Mr. R. S. Shriram, Mr. A Manikandan, Mr J Rajkumar, and Mr P J Kummareashvar, who extended their valuable support for experimentation. The authors also thank Mr. D. Ravi and Mr. P. T. Sureshkumar, Technical Staffs, Heat Power Lab, CIT for their techno-administrative support during experimentations.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Coimbatore Institute of Technology, Coimbatore, 641014, India

    P. Ramakrishnan, A. S. Krishnan & S. Gowtham

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  1. P. Ramakrishnan
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  3. S. Gowtham
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Correspondence to A. S. Krishnan.

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Ramakrishnan, P., Krishnan, A.S. & Gowtham, S. Experimental studies on performance augmentation of single hole cored brick sensible heat storage system using turbulence inducers. J Therm Anal Calorim 136, 345–354 (2019). https://doi.org/10.1007/s10973-018-7878-3

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