Performance Enhancement of Compact Thermal Battery System for Refrigeration Applications
Student · Middle Technical University
Author · Middle Technical University, Polytechnic College of Engineering Specializations – Baghdad,
Supervisor · Middle Technical University, Engineering Technical College-Baghdad
Supervisor · Middle Technical University, Engineering Technical College-Baghdad
Abstract
The Adsorption Thermophysical Battery (ATB) is emerging as a sustainable alternative to electrical-powered vapor-compression systems in the field of cooling technology. The primary purpose of this study was to examine and evaluate the performance of the developed two-bed ATB under different operating conditions. The present study was divided into theoretical, experimental, and numerical analysis.
The theoretical study dealt with solving the Lumped Parameter Predicting Model (LPM), modified Freundlich adsorption, and kinetic equilibrium equations to evaluate the performance of Metal-Organic Frameworks adsorbent (MOF-801) and RD-silica gel. MATLAB-19 software and engineering equation solver (EES) were used to solve and analyze the theoretical study. Conversely, in the experimental part, a test rig of a two-bed ATB system with mass recovery was fabricated and examined. The ATB unit has two Adsorber Bed Units (ABU), each 24 cm in diameter and 30 cm in height, manufactured for semi-continuous operation and refrigeration. Each ABU can function as either an adsorption or desorption medium.
In addition, the design integrates the evaporator and condenser into a single heat exchanger called the Evaporator-Condenser Unit (ECU), which has dimensions of 22 cm in length, 14 cm in width, and 12 cm in height. This unit reduces the overall size and costs of the ATB. Furthermore, the ATB utilized Mobil Composition of Matter (MCM-41) and Regular Density (RD) silica gel as adsorbent materials. At the same time, the numerical part dealt with solving the transient three-dimensional local thermal non-equilibrium model using COMSOL-6 software to analyze Heat and Mass Transfer (HMTM) inside the adsorbent-packed bed.
The theoretical results concluded that the coefficient of performance (COP) of the ATB when using MOF 801 outperforms silica gel RD and enhancement by 20 % when the cycle time is set at 1000 s. Also, the COP and the specific cooling power (SCP) of the ATB were improved by about 25 % and 39 % for Metal-Organic Frameworks (MOF 801) compared with silica gel at the entire mass of the adsorbent 10 kg, respectively. The COP of the ATB was reduced by 31.6 % when the hot water temperature increased from 343 to 363 K. It increased by 5% when the cooled coolant temperature dropped from 313 to 303 K for MOF-801. Also, it can be concluded that the COP was directly proportional to the chilled and cooled water flow rate and inversely to the hot water flow rate. Next, the experimental results showed that the COP and refrigeration capacity (RC) of the two-bed ATB were improved by 14 and 8% when using mass recovery, respectively, compared with the system without mass recovery. Also, the investigation revealed an enhancement in RC and COP using MCM-41 by 11.1% for RC and 10.5 % for COP compared with silica gel-RD for the same operation conditions. The COP of the two-bed mass recovery ATB was improved by 14% and 8.6 % for RD-silica gel and MCM-41, respectively, compared with single-bed ATB. Finally, the numerical results summarized that the temperature of the solid adsorbent increased gradually during the discharge process and decreased gradually during the charge process over time. Also, the thinner layer can be cooled faster than the thicker layers. As predicted, the temperature and uptake distribution for the smaller layer thickness of 2 mm were better than those of the 4 mm and 6 mm.
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Student
Fadhil Abdulrazzaq Kareem
Middle Technical University
Author
Fadhil Abdulrazzaq Kareem
Middle Technical University, Polytechnic College of Engineering Specializations – Baghdad,
Supervisor
Dr. Abdul Hadi N. Khalifa
Middle Technical University, Engineering Technical College-Baghdad
Supervisor
Dr. Ahmed J. Hamad
Middle Technical University, Engineering Technical College-Baghdad
Associated Publications
Published or accepted papers derived from this work
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Numerical analysis of two-bed adsorption thermophysical battery
Applied Thermal Engineering, 2024 · Published
Authors: Fadhil Abdulrazaq Kareem iD (Middle Technical University, Technical Engineering College, Baghdad, Iraq)، Abdul Hadi N. Khalifa iD (Middle Technical University, Institute of Technology, Baghdad, Iraq)، Ahmed J. Hamad a iD (Middle Technical University, Institute of Technology, Baghdad, Iraq)
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Experimental investigation of two-bed adsorption thermophysical battery with mass recovery technology
Energy Conversion and Management, 2024 · Published
Authors: Fadhil Abdulrazaq Kareem iD (Middle Technical University, Technical Engineering College – Baghdad, Iraq)، Ahmed J. Hamad iD (Middle Technical University, Institute of Technology - Baghdad, Iraq)، Abdul Hadi N. Khalifa iD (Middle Technical University, Institute of Technology - Baghdad, Iraq)
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Intermittent and continuous adsorption refrigeration systems techniques: A review
AIP Conference Proceedings, 2024 · Published
Authors: Fadhil Abdulrazaq Kareem iD (Middle Technical University, Institute of Technology, Baghdad, Iraq)، Abdul Hadi N. Khalifa iD (Middle Technical University, Technical Engineering College, Baghdad, Iraq)، Ahmed J. Hamad a iD (Middle Technical University, Technical Engineering College, Baghdad, Iraq)
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