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31. Parametric analysis of chiller plant energy consumption in a tropical climate

Author

Esther Benedicta Kyere, Jen Tien-Chien, and Lagouge Tartibu

Subjects
Chilled water temperature setpoint, Fan coil system, Energy saving, PMV-PPD, DOE, TRNSYS simulation, Low temperature engineering. Cryogenic engineering. Refrigeration, TP480-498
Abstract

Abstract The approach that could reduce the energy consumption of water-cooled chillers in office buildings was investigated through experimental and simulation methods. The chiller was modelled in TRNSYS and validated using physical measurements from an operational water-cooled water chiller and fan coil system. The validated model was used to analyse the energy consumption of the water chiller-fan coil system under a high chilled water temperature setpoint (CWTS) in a representative commercial office building. Subsequently, indoor thermal comfort was evaluated using the PMV-PPD model. Finally, the design of experiment (DOE) was employed using a statistical two-level non-randomized factorial design in Minitab to study the effects of high CWTS, number of rows, and tube diameter on the heat and mass transfer performance of the fan coil unit. The results showed that the CWTS can be increased by various degrees from 10 up to 18 °C for energy efficiency for a commercial office building in the tropics. This increase in CWTS would result in a daily energy saving potential of about 5% of the chiller as compared to the existing operational settings without any extra cost. Conversely, the daily energy consumption by the fan coil would increase by about 5.5% by this increment in the CWTS. It was determined that the chiller system can provide comfort even when the CWTS is increased to 14 °C. The DOE analysis showed that under the condition of high CWTS (14 °C), energy consumption that is less than the current energy consumption may be expected from the fan coil system when the number of rows increased from 3 to 6 and the tube diameter increased from 7 to 9 mm.

Published
2023
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32. A mini-review on MoS2 membrane for water desalination: Recent development and challenges

Author

Opetubo Oriyomi Rasak, Kitalu Ricin, Oviroh Peter Ozaveshe, Oyinbo Sunday Temitope, Imoisili Patrick Ehi, and Jen Tien-Chien

Subjects
water desalination, mos2 membranes, water flux, ion rejection, nanosheets, Technology, Chemical technology, TP1-1185, Physical and theoretical chemistry, QD450-801
Abstract

This review provides comprehensive studies of molybdenum disulfide (MoS2) for water desalination. The most recent molecular dynamics simulation and experimental work on the design, fabrication, ion rejection, and water flux of MoS2 were summarized. Since MoS2 has excellent properties such as physicochemical, mechanical, and biological properties compared to other 2D materials such as graphene-based nanomaterial, it is necessary to have a critical study on MoS2-based membranes. Hence, a critical review of MoS2-based membranes has been found essential for us to investigate and evaluate the findings in this field and objectively assess the current state-of-the-art in water desalination. The advantages of desalination technology and the primary approaches that have been used up until now are first outlined in this study, deeply emphasizing membrane technology. The primary mechanism of salt rejection in membrane technology is explained. Then, the types of MoS2-based membranes for water desalination are reviewed based on the different published works while critically reviewing the performance of each type of MoS2-based membranes.

Published
2023
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37. Impact of Milling on Hardness and Optical Transmission of PMMA Lenses : An Experimental and Mathematical Approach

Author

Wambua, Job Maveke, Mwema, Fredrick M., Tanya, Buddi, Jen, Tien-Chien, Akinlabi, Esther T., Cavas-Martínez, Francisco, Editorial Board Member, Chaari, Fakher, Series Editor, di Mare, Francesca, Editorial Board Member, Gherardini, Francesco, Series Editor, Haddar, Mohamed, Editorial Board Member, Ivanov, Vitalii, Series Editor, Kwon, Young W., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Emamian, Seyed Sattar, editor, Awang, Mokhtar, editor, Razak, Jeeferie Abd, editor, and Masset, Patrick J., editor

Published
2023
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