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  • Open Access

    ARTICLE

    Thermal Performance and Economic Efficiency Comparison of Typical Shallow and Medium-Deep Borehole Heat Exchanger Heating Systems in Xi’an, China

    Yuze Xue1, Li Kou2,3, Guosheng Jia4,*, Liwen Jin4, Zhibin Zhang4, Jianke Hao4, Lip Huat Saw5,*

    Energy Engineering, Vol.122, No.3, pp. 1005-1024, 2025, DOI:10.32604/ee.2025.059198 - 07 March 2025

    Abstract Geothermal energy, a form of renewable energy, has been extensively utilized for building heating. However, there is a lack of detailed comparative studies on the use of shallow and medium-deep geothermal energy in building energy systems, which are essential for decision-making. Therefore, this paper presents a comparative study of the performance and economic analysis of shallow and medium-deep borehole heat exchanger heating systems. Based on the geological parameters of Xi’an, China and commonly used borehole heat exchanger structures, numerical simulation methods are employed to analyze performance and economic efficiency. The results indicate that increasing the… More > Graphic Abstract

    Thermal Performance and Economic Efficiency Comparison of Typical Shallow and Medium-Deep Borehole Heat Exchanger Heating Systems in Xi’an, China

  • Open Access

    ARTICLE

    Thermal Performance of Entropy-Optimized Tri-Hybrid Nanofluid Flow within the Context of Two Distinct Non-Newtonian Models: Application of Solar-Powered Residential Buildings

    Ahmed Mohamed Galal1,2, Adebowale Martins Obalalu3, Akintayo Oladimeji Akindele4, Umair Khan5,6, Abdulazeez Adebayo Usman7, Olalekan Adebayo Olayemi8, Najiyah Safwa Khashi’ie9,*

    CMES-Computer Modeling in Engineering & Sciences, Vol.142, No.3, pp. 3089-3113, 2025, DOI:10.32604/cmes.2025.061296 - 03 March 2025

    Abstract The need for efficient thermal energy systems has gained significant attention due to the growing global concern about renewable energy resources, particularly in residential buildings. One of the biggest challenges in this area is capturing and converting solar energy at maximum efficiency. This requires the use of strong materials and advanced fluids to enhance conversion efficiency while minimizing energy losses. Despite extensive research on thermal energy systems, there remains a limited understanding of how the combined effects of thermal radiation, irreversibility processes, and advanced heat flux models contribute to optimizing solar power performance in residential… More > Graphic Abstract

    Thermal Performance of Entropy-Optimized Tri-Hybrid Nanofluid Flow within the Context of Two Distinct Non-Newtonian Models: Application of Solar-Powered Residential Buildings

  • Open Access

    ARTICLE

    Numerical Investigation on Thermal Performance of Single-Phase Immersion Cooling Systems Using Oil Coolant

    Yiming Rongyang1, Zhenyue Yu1, Ruisheng Liang2,*, Wei Su1, Jianjian Wei2,3

    Frontiers in Heat and Mass Transfer, Vol.23, No.1, pp. 279-298, 2025, DOI:10.32604/fhmt.2025.059637 - 26 February 2025

    Abstract Data center cooling systems are substantial energy consumers, and managing the heat generated by electronic devices is becoming more complex as chip power levels continue to rise. The single-phase immersion cooling (SPIC) server with oil coolant is numerically investigated using the validated Re-Normalization Group (RNG) k-ε model. For the investigated scenarios where coolant velocity at the tank inlet is 0.004 m/s and the total power is 740 W, the heat transfer between the heat sinks and the coolant is dominated by natural convection, although forced convection mediates the overall heat transfer inside the tank. The maximum… More >

  • Open Access

    ARTICLE

    Thermo-Hydraulic Performances of Microchannel Heat Sinks with Different Types of Perforated Rectangular Blocks

    Heng Zhao1, Honghua Ma2, Hui Liu1, Xiang Yan1, Huaqing Yu1, Yongjun Xiao1, Xiao Xiao3,*

    FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.1, pp. 87-105, 2025, DOI:10.32604/fdmp.2024.056577 - 24 January 2025

    Abstract The behavior of single-phase flow and conjugate heat transfer in micro-channel heat sinks (MCHS) subjected to a uniform heat flux is investigated by means of numerical simulations. Various geometrical configurations are examined, particularly, the combinations of rectangular solid and perforated blocks, used to create a disturbance in the flow. The analysis focuses on several key aspects and related metrics, including the temperature distribution, the mean Fanning friction factor, the pressure drop, the Nusselt number, and the overall heat transfer coefficient across a range of Reynolds numbers (80–870). It is shown that the introduction of such More >

  • Open Access

    ARTICLE

    Enhancing Thermal Performance of Building Envelopes Using Hemp Wool and Wood Wool with Phase Change Materials

    Salma Kouzzi1,*, Mouniba Redah1, Souad Morsli2, Mohammed El Ganaoui3, Mohammed Lhassane Lahlaouti1

    FDMP-Fluid Dynamics & Materials Processing, Vol.20, No.12, pp. 2741-2755, 2024, DOI:10.32604/fdmp.2024.055890 - 23 December 2024

    Abstract This study investigates the potential for enhancing the thermal performance of external walls insulation in warmer climates through the combination of phase change materials (PCMs) and bio-based materials, specifically hemp wool and wood wool. Experimental tests using the heat flow method (HFM), and numerical simulations with ANSYS Fluent software were conducted to assess the dynamic thermal distribution and fluid-mechanical aspects of phase change materials (PCMs) within composite walls. The results demonstrate a notable reduction in peak indoor temperatures, achieving a 58% reduction with hemp wool with a close 40% reduction with wood wool when combined More >

  • Open Access

    ARTICLE

    Hybrid Epoxy Composites Reinforced with Coconut Sheath and Basalt Fibres: Enhancing Mechanical and Thermal Performance for Sustainable Applications

    Subburayan Manickavasagam Suresh Kumar1, Sundaravel Balachandran2, Seong Cheol Kim3, Balamurugan Rathinam4,*, Vanaraj Ramkumar3,5,*

    Journal of Polymer Materials, Vol.41, No.4, pp. 207-218, 2024, DOI:10.32604/jpm.2024.057901 - 16 December 2024

    Abstract The present study focuses on sustainable biopolymer composites created from coconut sheath and basalt fibres, which are biodegradable, environmentally benign, and have low carbon footprints. High specific strength, superior mechanical performance, reduced weight, and improved thermal stability are all displayed by these materials. Four hybrid epoxy composites (C1–C4) were produced utilizing five stacking sequences and compression moulding, demonstrating that hybridization considerably enhances mechanical characteristics. The hybrid and pure basalt fibre composites have larger storage moduli than untreated coconut sheath fibre-reinforced epoxy (2.1 GPa). The greatest glass transition temperature (Tg) for C4 has been determined to More > Graphic Abstract

    Hybrid Epoxy Composites Reinforced with Coconut Sheath and Basalt Fibres: Enhancing Mechanical and Thermal Performance for Sustainable Applications

  • Open Access

    ARTICLE

    Impact of Different Rooftop Coverings on Photovoltaic Panel Temperature

    Aws Al-Akam1,*, Ahmed A. Abduljabbar2, Ali Jaber Abdulhamed1

    Energy Engineering, Vol.121, No.12, pp. 3761-3777, 2024, DOI:10.32604/ee.2024.055198 - 22 November 2024

    Abstract Photovoltaic (PV) panels are essential to the global transition towards sustainable energy, offering a clean, renewable source that reduces reliance on fossil fuels and mitigates climate change. High temperatures can significantly affect the performance of photovoltaic (PV) panels by reducing their efficiency and power output. This paper explores the consequential effect of various rooftop coverings on the thermal performance of photovoltaic (PV) panels. It investigates the relationship between the type of rooftop covering materials and the efficiency of PV panels, considering the thermal performance and its implications for enhancing their overall performance and sustainability. The… More >

  • Open Access

    ARTICLE

    Study of Hygrothermal Behavior of Bio-Sourced Material Treated Ecologically for Improving Thermal Performance of Buildings

    Soumia Mounir1,2,*, Miloudia Slaoui2, Youssef Maaloufa1,2, Fatima Zohra El Wardi2,3, Yakubu Aminu Dodo4,5, Sara Ibn-Elhaj2, Abdelhamid Khabbazi2

    Journal of Renewable Materials, Vol.12, No.5, pp. 1007-1027, 2024, DOI:10.32604/jrm.2024.049392 - 17 July 2024

    Abstract Creating sustainable cities is the only way to live in a clean environment, and this problem can be solved by using bio-sourced and recycled materials. For this purpose, the authors contribute to the valuation of sheep wool waste as an eco-friendly material to be used in insulation. The paper investigates the thermal, hygrothermal, and biological aspects of sheep wool by testing a traditional treatment. The biological method of aerobic mesophilic flora has been applied. Fluorescence X was used to determine the chemical composition of the materials used. Also, thermal characterization has been conducted. The thermal… More >

  • Open Access

    ARTICLE

    Enhancing Hygrothermal Performance in Multi-Zone Constructions through Phase Change Material Integration

    Abir Abboud1, Zakaria Triki1, Rachid Djeffal2, Sidi Mohammed El Amine Bekkouche2, Hichem Tahraoui1,3,4, Abdeltif Amrane4, Aymen Amin Assadi5, Lotfi Khozami5, Jie Zhang6,*

    Frontiers in Heat and Mass Transfer, Vol.22, No.3, pp. 769-789, 2024, DOI:10.32604/fhmt.2024.050330 - 11 July 2024

    Abstract As buildings evolve to meet the challenges of energy efficiency and indoor comfort, phase change materials (PCM) emerge as a promising solution due to their ability to store and release latent heat. This paper explores the transformative impact of incorporating PCM on the hygrothermal dynamics of multi-zone constructions. The study focuses on analyzing heat transfer, particularly through thermal conduction, in a wall containing PCM. A novel approach was proposed, wherein the studied system (sensitive balance) interacts directly with a latent balance to realistically define the behavior of specific humidity and mass flow rates. In addition, More >

  • Open Access

    ARTICLE

    Investigate the Impact of Dimple Size and Distribution on the Hydrothermal Performance of Dimpled Heat Exchanger Tubes

    Abeer H. Falih*, Basima Salman Khalaf, Basim Freegah

    Frontiers in Heat and Mass Transfer, Vol.22, No.2, pp. 597-613, 2024, DOI:10.32604/fhmt.2024.049812 - 20 May 2024

    Abstract In this study, the primary objective was to enhance the hydrothermal performance of a dimpled tube by addressing areas with low heat transfer compared to other regions. To accomplish this, a comprehensive numerical investigation was conducted using ANSYS Fluent 2022 R1 software, focusing on different diameters of dimples along the pipe’s length and the distribution of dimples in both in-line and staggered arrangements. The simulations utilized the finite element method to address turbulent flow within the tube by solving partial differential equations, encompassing Re numbers spanning from 3000 to 8000. The study specifically examined single-phase… More > Graphic Abstract

    Investigate the Impact of Dimple Size and Distribution on the Hydrothermal Performance of Dimpled Heat Exchanger Tubes

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