Heating performance of a solar chimney combined PCM: a numerical case study

Shuli Liu; Y. Li

doi:10.1016/j.enbuild.2015.04.020

Heating performance of a solar chimney combined PCM: a numerical case study

Shuli Liu, Y. Li

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Abstract

An experimentally validated numerical model is developed to study the effects of seven design and operational parameters on the heating performance of a solar chimney incorporated with phase change material (PCM) in this paper. It is found that when the latent heat increases from 70 to 170 kJ/kg, the melting time is increased by 103% and freezing time is prolonged by 60%. If heat flux is increased by 33%, the melting time is reduced by 36.4%. Increasing thermal conductivity of the insulation material from 0.02 to 0.06 W/m K, the melting time is prolonged by 47.2%. When absorptivity of the absorber is increased from 0.8 to 1.0, the melting time is decreased by 26.3%. When transmissivity of the glass cover is increased by 25%, the melting time is reduced by 26.7%. For the inlet air temperature, when it decreases from 25 to 15 °C, the freezing time is shortened by 39%. The melting time is only reduced by 8% when thermal conductivity of the absorber is increased by 25 times. Therefore, it can be concluded that the first six parameters have more impact on the system's performance. While the thermal conductivity of absorber slightly impacts it.

Original language	English
Pages (from-to)	117-130
Journal	Energy and Buildings
Volume	99
Early online date	20 Apr 2015
DOIs	https://doi.org/10.1016/j.enbuild.2015.04.020
Publication status	Published - 15 Jul 2015

Bibliographical note

NOTICE: This is the author’s version of a work that was accepted for publication in Energy and Buildings. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Energy and Buildings, [99, 2015] DOI: 10.1016/j.enbuild.2015.04.020

© 2015, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

Keywords

solar chimney
phase change material
heating performance
numerical study

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10.1016/j.enbuild.2015.04.020

1-s2Accepted author manuscript, 1.59 MBLicence: CC BY-NC-ND

Cite this

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title = "Heating performance of a solar chimney combined PCM: a numerical case study",

abstract = "An experimentally validated numerical model is developed to study the effects of seven design and operational parameters on the heating performance of a solar chimney incorporated with phase change material (PCM) in this paper. It is found that when the latent heat increases from 70 to 170 kJ/kg, the melting time is increased by 103% and freezing time is prolonged by 60%. If heat flux is increased by 33%, the melting time is reduced by 36.4%. Increasing thermal conductivity of the insulation material from 0.02 to 0.06 W/m K, the melting time is prolonged by 47.2%. When absorptivity of the absorber is increased from 0.8 to 1.0, the melting time is decreased by 26.3%. When transmissivity of the glass cover is increased by 25%, the melting time is reduced by 26.7%. For the inlet air temperature, when it decreases from 25 to 15 °C, the freezing time is shortened by 39%. The melting time is only reduced by 8% when thermal conductivity of the absorber is increased by 25 times. Therefore, it can be concluded that the first six parameters have more impact on the system's performance. While the thermal conductivity of absorber slightly impacts it. ",

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author = "Shuli Liu and Y. Li",

note = "NOTICE: This is the author{\textquoteright}s version of a work that was accepted for publication in Energy and Buildings. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Energy and Buildings, [99, 2015] DOI: 10.1016/j.enbuild.2015.04.020 {\textcopyright} 2015, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/",

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N1 - NOTICE: This is the author’s version of a work that was accepted for publication in Energy and Buildings. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Energy and Buildings, [99, 2015] DOI: 10.1016/j.enbuild.2015.04.020 © 2015, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

PY - 2015/7/15

Y1 - 2015/7/15

N2 - An experimentally validated numerical model is developed to study the effects of seven design and operational parameters on the heating performance of a solar chimney incorporated with phase change material (PCM) in this paper. It is found that when the latent heat increases from 70 to 170 kJ/kg, the melting time is increased by 103% and freezing time is prolonged by 60%. If heat flux is increased by 33%, the melting time is reduced by 36.4%. Increasing thermal conductivity of the insulation material from 0.02 to 0.06 W/m K, the melting time is prolonged by 47.2%. When absorptivity of the absorber is increased from 0.8 to 1.0, the melting time is decreased by 26.3%. When transmissivity of the glass cover is increased by 25%, the melting time is reduced by 26.7%. For the inlet air temperature, when it decreases from 25 to 15 °C, the freezing time is shortened by 39%. The melting time is only reduced by 8% when thermal conductivity of the absorber is increased by 25 times. Therefore, it can be concluded that the first six parameters have more impact on the system's performance. While the thermal conductivity of absorber slightly impacts it.

AB - An experimentally validated numerical model is developed to study the effects of seven design and operational parameters on the heating performance of a solar chimney incorporated with phase change material (PCM) in this paper. It is found that when the latent heat increases from 70 to 170 kJ/kg, the melting time is increased by 103% and freezing time is prolonged by 60%. If heat flux is increased by 33%, the melting time is reduced by 36.4%. Increasing thermal conductivity of the insulation material from 0.02 to 0.06 W/m K, the melting time is prolonged by 47.2%. When absorptivity of the absorber is increased from 0.8 to 1.0, the melting time is decreased by 26.3%. When transmissivity of the glass cover is increased by 25%, the melting time is reduced by 26.7%. For the inlet air temperature, when it decreases from 25 to 15 °C, the freezing time is shortened by 39%. The melting time is only reduced by 8% when thermal conductivity of the absorber is increased by 25 times. Therefore, it can be concluded that the first six parameters have more impact on the system's performance. While the thermal conductivity of absorber slightly impacts it.

KW - solar chimney

KW - phase change material

KW - heating performance

KW - numerical study

U2 - 10.1016/j.enbuild.2015.04.020

DO - 10.1016/j.enbuild.2015.04.020

M3 - Article

SN - 0378-7788

SN - 1872-6178

VL - 99

SP - 117

EP - 130

JO - Energy and Buildings

JF - Energy and Buildings

ER -

Heating performance of a solar chimney combined PCM: a numerical case study

Abstract

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Keywords

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