ZEMCH 2019 International Conference Proceedings April.2020 | Page 142
A validated conjugate heat transfer model employing enthalpy‐based formulation using ANSYS
have been developed. Different levels of supplied air velocity are numerically tested at range of 4m/s
to 1 m/s. PCM achieved the peak‐temperature drop of 3°C in case of single column of PCM containers
supplying the air with the rate of 4m/s, while supplying the air with lower velocity of 1m/s achieves a
peak‐temperature drop of 5.5°C concluding that lower air velocity increased the pre‐cooling
performance of the air conditioning duct system. Applying series PCM columns located in the AC duct
system enhanced the pre‐cooling performance and reduced the outlet air temperature to 35°C yielding
a temperature drop up to 11°C due to increased latent heat storage. Integrating PCM‐based pre‐cooling
system cools the inlet air temperature offering a daily heat reduction of 25% for design#1 and 56.6% for
design#2 at velocity 1m/s respectively. Consequently, the cooling capacity applying PCM‐based pre‐
cooling unit reduced by almost 8% for design 1 and 22.5% for design 2 at velocity 1 m/s.
Further investigation in the optimum amount for the PCM to solidify over the nighttime, testing
different PCMs materials performance are under investigation. In addition, analysis of the properties
and the state of PCM including the number of melting/solidification cycles that they can undergo
without degrading and a good definition of fusion/liquefaction range and potential harmfulness
studies need to be further studied.
Author Contributions: M. Haggag and A. Hassan envisioned the idea and drew the methodology; A. Hassan, M.
Haggag, and S. Abdelbaqi conducted the experiments; A. Hassan and S. Abdelbaqi analyzed the data and
contributed numerical/materials/analysis. The paper was written and reviewed as a joint effort.
Funding: The UAE University funded this research, grant number G00001602
Acknowledgments: The authors would like to express their appreciations to the College of Engineering at the UAE
University for funding this research project.
References
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
131
M. Khoukhi ,S. Abdelbaqi and A. Hassan: Yearly Energy Performance Assessment of Employing Expanded
Polystyrene with Variable Temperature and Moisture–Thermal Conductivity Relationship.
Materials 2019, 12(18), 3000
M. Khoukhi, A. Hassan, S. Al‐Saadi and S. Abdelbaqi. A dynamic thermal response on thermal conductivity
at different temperature and moisture levels of EPS insulation. Case Studies in Thermal Engineering. Volume
14, September 2019, 100481
A. Hasan, K. A. Al‐Sallal, H. Alnoman, Y. Rashid and S. Abdelbaqi. Effect of Phase Change Materials (PCMs)
Integrated into a Concrete Block on Heat Gain Prevention in a Hot Climate. Sustainability 2016, 8(10), 1009
M. Haggag , A. Hassan, S. Abdelbaqi. Phase Change Material to Reduce Cooling Load of Buildings in Hot
Climate. Key Engineering Materials 801, 416‐423
A. Hasan, J. Sarwar, H. Alnoman, S. Abdelbaqi. Yearly energy performance of a photovoltaic‐phase change
material (PV‐PCM) system in hot climate. Solar Energy 146, 417‐429
R.L. Zeng, X. Wang, H.F. Di, F. Jiang, Y.P. Zhang, New concepts and approach for developing energy efficient
buildings: ideal specific heat for building internal thermal mass, Energy Build. Vol. 43 (2011), p. 1081–1090.
Mao, D.M. Pani, M.J. Song, Z. Li, S.M. Deng, Operating optimization form proved energy consumption of a
TAC system affected by night time thermal loads of building envelopes, Energy, 133 (2017), p. 491–501.
A. Hasan, H. Hejase, S. Abdelbaqi, A. Assi, M. Hamdan. Comparative effectiveness of different phase change
materials to improve cooling performance of heat sinks for electronic devices. 2016 Applied Sciences 6 (9),
226.
A. Fallahi , G. Guldentops , M. Tao, S. Granados‐Focil and S. V. Dessel. Review on solid‐solid phase change
materials for thermal energy storage: Molecular structure and thermal properties. Applied Thermal
Engineering 127 (2017) 1427–1441.
Y. Ma, X. Chu, W. Li, G. Tang, Preparation and characterization of poly(methyl methacrylate‐co‐
divinylbenzene) microcapsules containing phase change temperature adjustable binary core materials, Sol.
Energy Vol. 86 (2012), p. 2056‐2066.
ZEMCH 2019 International Conference l Seoul, Korea