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A comprehensive thermal analysis of icemaking process inside a domestic freezer: Theoretical, numerical and experimental analyses

Akbar Ahmadi, Ali (author), Hooman, K. (author), Rahbari, Alireza (author)

Automatic icemakers are integrated into refrigerators to ensure a consistent ice supply and improve energy efficiency. Despite these advantages, a thorough investigation of the automatic icemaking process in domestic refrigerator-freezers is lacking in the literature. This study aims at assessing the performance of automatic icemaking process...

journal article 2024

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Experimental comparative study on thermal performance of latent heat storage tanks with pin, perforated, and rectangular fins at different orientations

Safari, Vahid (author), Kamkari, Babak (author), Hewitt, Neil (author), Hooman, K. (author)

The low thermal conductivity of phase change materials (PCMs) has limited their widespread use in practical applications. In the present study, different fin structures, namely, rectangular, perforated, and pin were examined to analyze the thermal performance of the melting process in rectangular latent heat storage tanks. Experiments were...

journal article 2024

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Market-orientated solutions to increase thermal conductivity in latent thermal energy storage systems

Righetti, Giulia (author), Zilio, Claudio (author), Hooman, K. (author), Mancin, Simone (author)

Among experts, it is well-known that the thermal conductivity of PCMs (phase change materials) is low hence a major limitation for their commercial application. This work proposes alternative, inexpensive, but nevertheless effective solutions to increase the average thermal conductivity of a PCM system (a commercial paraffin wax, having a...

journal article 2024

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Optimization of adaptive metal foam arrangement in a heat storage tank

Guo, Junfei (author), Li, Ze (author), Wei, Pan (author), Li, Ling (author), Yang, Xiaohu (author), He, Ya Ling (author), Hooman, K. (author)

The integration of phase change materials (PCMs) and metal foam has been widely concerned recently. To decrease non-uniformity of uniform metal foam-PCMs, adaptive metal foam arrangement strategy with increasing porosity from inside to outside has attracted widespread attention. This work conducted a symmetric simulation model of vertical...

journal article 2023

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Effect of CO₂-based binary mixtures on the performance of radial-inflow turbines for the supercritical CO₂ cycles

Yang, Yueming (author), Wang, Xurong (author), Hooman, K. (author), Han, Kuihua (author), Xu, Jinliang (author), He, Suoying (author), Qi, Jianhui (author)

Recently, the supercritical carbon dioxide (SCO₂) power cycle has become a hotspot in the field of energy-efficient utilization. The utilization of additives in the power cycle has been proven to be an effective way to improve the SCO₂ power cycle efficiency. As one of the core components of the system, the influence of...

journal article 2023

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Extensive analysis of PCM-based heat sink with different fin arrangements under varying load conditions and variable aspect ratio

Nedumaran, Muthamil Selvan (author), Gnanasekaran, Nagarajan (author), Hooman, K. (author)

The present study compares a modified variable height fin heat sink with the conventional constant height fin heat sink. The two heat sinks are filled with an equal volume of PCM (n-eicosane) and a fin volume fraction of 8 %. The experiments are performed for constant loads and also different power surge conditions. The pulsed heat loads are...

journal article 2023

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Multi-Objective Optimization of Hybrid Heat Sinks with Phase Change Materials

Nedumaran, Muthamil Selvan (author), Trilok, Govindappa (author), Gnanasekaran, Nagarajan (author), Hooman, K. (author)

A passive method with phase change material (PCM) is an appropriate technique in electronic cooling. But, due to its poor thermal conductivity, many enhancers are employed to reduce the thermal resistance offered by the PCM. A partial filling strategy to reduce the cost and weight of foams with fins is used in this study. A hybrid heat sink...

journal article 2023

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Performance Comparison between Data Centers with Different Airflow Management Technologies

Li, Xueqiang (author), Zhang, Zhongyao (author), Wang, Qihui (author), Yang, Xiaohu (author), Hooman, K. (author), Liu, Shengchun (author)

Air cooling systems are widely used in current data centers owing to their low capital costs and high reliability. To satisfy the increasing rack power density, the optimal air-cooling technology and an economic analysis should be carefully discussed. Therefore, this study discusses four airflow management technologies: Case 1: raised floor...

journal article 2023

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Discharge performance of a high temperature phase change material with low-cost wire mesh

Opolot, Michael (author), Zhao, Chunrong (author), Keane, Partrick F. (author), Liu, Ming (author), Mancin, Simone (author), Bruno, Frank (author), Hooman, K. (author)

Thermal energy storage is increasingly needed in a sustainable world because of its potential of capturing waste heat and being incorporated in solar power plants. For power generation, in particular, as turbine technology advances, a demand for higher temperature thermal energy storage materials also grows. For this purpose, latent thermal...

journal article 2023

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Combustion Air Humidification for NOx Emissions Reduction in Gas Boiler: An Experimental Study

Zhang, Qunli (author), Zhao, Wenqiang (author), Sun, Donghan (author), Meng, Xiangzhao (author), Hooman, K. (author), Yang, Xiaohu (author)

NO_x emission reduction from gas boilers has become a key issue in improving air quality. Combustion air humidification technology is gradually being used to reduce NO_x emissions. However, the NO_x emission reduction effect of gas boilers at a higher combustion air humidity has been studied less. A flue gas with...

journal article 2023

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A biomimetic red blood cell inspired encapsulation design for advanced hydrate-based carbon capture

Zhang, Yuxuan (author), Zhai, Xiaoqiang (author), Zhang, Fengyuan (author), Zhang, Zhongbin (author), Hooman, K. (author), Zhang, Hai (author), Wang, Xiaolin (author)

Enhancing gas-liquid mass transfer is key to promote gas hydrate formation kinetics. Encapsulation of CO₂ hydrate is expected to dramatically increase gas-liquid contact to enhance mass transfer. However, gas hydrate encapsulation has never been proposed as the technical issues of gas permeation through capsule shells have never...

journal article 2023

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CFD analyses for the development of an innovative latent thermal energy storage for food transportation

Calati, Michele (author), Righetti, Giulia (author), Zilio, Claudio (author), Hooman, K. (author), Mancin, Simone (author)

The transportation of perishable products is a crucial activity that must be carefully managed along the cold chain. The refrigerated transport aims at ensuring the suitable transportation conditions by maintaining the desired temperature level in the refrigerated compartment. Moreover, the carriage of perishable fresh foodstuffs calls for...

journal article 2023

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Influence of solder condition on effective thermal conductivity of two-directional random fibres: Pore-scale simulation

Xiao, Tian (author), Zhang, Qiaoling (author), Yang, Xiaohu (author), Hooman, K. (author), Li, Guodong (author)

It is indicated that the solder joint of the metal fibrous materials is a critical factor impacting the heat conduction. To reveal the mechanism by which solder joint sizes, solder joint skips, solder flux materials, and filling media affect the thermal conductivity of fibres, pore-scale numerical simulation is employed to study the thermal...

journal article 2023

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Effect of soot particle deposition on porous fouling formation and thermal characteristics of an exhaust gas recirculation cooler

Khoshnood, Alireza (author), Maerefat, Mehdi (author), Imani, Gholamreza (author), Hooman, K. (author)

Exhaust gas recirculation (EGR) systems have been successfully employed to reduce the NOx emissions in diesel engines. However, the fouling problem in EGR coolers challenges their capability to comply with stringent environmental regulations. A few numerical simulations have considered the fouling growth in EGR coolers. Those studies modeled...

journal article 2023

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Microstructural properties and surface roughness of 3D printed open cell-foam

Shikh Anuar, Fadhilah (author), Mustapha, Khairul Azhar (author), Sa'at, Fatimah Al Zahrah Mohd (author), Zini, Nurul Hilwa Mohd (author), Tokit, Ernie Mat (author), Narasimmanaidu, Satishwara Rao (author), Hooman, K. (author)

In this study, the microstructure of open-cell metal foam was generated and reconstructed, to produce a new generation of open-cell foam, which is called 3D printed open-cell foam. At the current stage of research, nylon powder and plastic acid are utilized as the materials for two different 3D printing technologies: Selective Laser Sintering...

journal article 2023

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A designed wall roughness approach to improve turbulent heat transfer to supercritical CO₂ flowing in horizontal tubes

Wang, Jianyong (author), Yang, Jun (author), Gong, Jishuang (author), Zhao, Chunrong (author), Hooman, K. (author)

Supercritical flow through a horizontal pipe leads to a non-uniform peripheral wall temperature distribution even when the wall heat flux is kept constant and uniform. This is attributed to lower heat transfer coefficient at the top section where the denser fluid tends to sink. Hence, to obtain a uniform wall temperature, a designed wall...

journal article 2022

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Thermo-Economic Assessment on Insulation Conditions of the Buried Heating Pipeline for District Heating

Zhang, Lianying (author), Zhang, Qingzeng (author), Yang, Xiaohu (author), Hooman, K. (author)

Insulation performance and buried depth of heating pipelines are the vital factors affecting the energy loss of directly buried heating pipelines. This study considers the thermo-economic assessment of insulation of directly buried heating pipelines for district heating. The optimal insulation thickness, energy-saving effect, and payback...

journal article 2022

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The cooling efficiency of s-CO₂ microchannel heat sink compared with a water-based design

Dehdashti Akhavan, Navid (author), Abroug, Foued (author), Arnaud, Lionel (author), Hooman, K. (author)

High-pressure drops characteristic of microchannel heat sinks (MCHS) is an issue that needs to be addressed to reduce the size of heat-removing devices in compact electronic devices. Supercritical carbon dioxide (s-CO₂) is a suitable candidate being proposed as an alternative coolant to enhance the cooling of the microchannel heat sink (MCHS)...

journal article 2022

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CFD modeling of the building integrated with a novel design of a one-sided wind-catcher with water spray: Focus on thermal comfort

Foroozesh, Jamal (author), Hosseini, S. H. (author), Ahmadian Hosseini, A. J. (author), Parvaz, F. (author), Elsayed, K. (author), Uygur Babaoğlu, Nihan (author), Hooman, K. (author), Ahmadi, G. (author)

The rising energy demand for buildings has enhanced public awareness of sustainable energy sources and technologies. In particular, natural ventilation systems such as wind-catchers have attracted considerable new attention. A new wind-catcher design with single-stage direct-air evaporative cooling was proposed for indoor air conditioning. An...

journal article 2022

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Sensitivity analysis of design parameters for melting process of lauric acid in the vertically and horizontally oriented rectangular thermal storage units

Safari, Vahid (author), Kamkari, Babak (author), Hooman, K. (author), Khodadadi, J. M. (author)

Widespread commercialization of PCM-based latent heat storage systems is limited by the low melting and solidification rates during the phase transition process. In this study, fins are used to enhance the phase change process. A parametric study is conducted to understand the effect of fins on the thermal performance of vertically- and...

journal article 2022