Article
Energy & Fuels
Ying Xu, Bin Bo Sun, Li Jun Liu, Xiao Yan Liu
Summary: This study focused on the combination of phase change energy storage materials with floor radiant cooling and heating system to establish a new heat transfer model, solving issues related to the heat transfer characteristics, optimal water supply temperature, and surface temperature changes of the floor under different working conditions in winter and summer.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Construction & Building Technology
Haruka Kitagawa, Takashi Asawa, Tetsu Kubota, Andhang Rakhmat Trihamdani
Summary: This study established a coupled simulation model of heat balance analysis and CFD for naturally ventilated buildings with PCMs, and conducted a sensitivity analysis for a radiant floor cooling system using PCMs. The results showed high accuracy in evaluating PCM temperature and heat balance, with improved precision through coupling with radiative heat transfer calculation. Optimum settings for the radiant floor cooling system under hot and humid conditions were identified as a 6 mm PCM thickness and nighttime ventilation.
BUILDING AND ENVIRONMENT
(2022)
Article
Thermodynamics
Zhongbao Liu, Ziyan Wei, Ruonan Teng, Han Sun, Zhipeng Qie
Summary: With the development of the economy, improving energy efficiency and saving energy have become important issues. Combining phase change heat storage material with floor radiation heating is an effective way to improve energy utilization efficiency. This paper introduces a composite phase change heat storage material used in radiant floor heating and conducts experiments on a floor radiation heating system based on heat storage in different environments. The results showed significant improvements in thermal conductivity and heat release time, making this system a promising solution for achieving heating comfort and economy.
APPLIED THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Henghua Zhang, Qianbin Dong, Juetian Lu, Yaping Tang, Wenjian Bi, Yue Gao, Hui Yang, Jiabang Wang
Summary: In this study, sodium acetate trihydrate was modified with urea, ethylene glycol, and disodium hydrogen phosphate dodecahydrate. The modified phase change material was impregnated into expanded perlite to obtain a composite phase change material, which was encapsulated with epoxy resin as the coating to obtain a coated composite phase change material with excellent thermal stability and minimal leakage. Lab tests showed delayed temperature reduction and prolonged thermal performance in insulated boxes.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Construction & Building Technology
Won Duk Suh, Jihee Nam, Young Uk Kim, Ji Yong Choi, Sumin Kim
Summary: In this study, wood thermal performance was improved by utilizing phase change materials (PCMs) with latent heat. The appropriateness of PCM impregnation and the compatibility as flooring material were evaluated through analyzing the morphological, structural, and chemical properties of composites. The thermal performances of the composites were verified by measuring latent heat, surface temperature, thermal conductivity, and dynamic heat transfer test. The composites exhibited high latent heat and have prospective applications in floor radiant heating systems.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Thermodynamics
Barbara Larwa, Silvia Cesari, Michele Bottarelli
Summary: The study aimed to investigate a hydronic radiant floor heating system integrated with macroencapsulated PCM through experimental and numerical analysis of system performance under various conditions. Results showed that high thermal conduction in mortar enhances overall system performance, while coupling technology with PCM containers significantly enhances the effect of wet sand.
Article
Thermodynamics
Tingting Jiang, Chenxiao Zheng, Shijun You, Huan Zhang, Zhenjing Wu, Yaran Wang, Shen Wei
Summary: A novel ASHP system integrated with radiant floor heating condenser and composite phase change material is proposed to overcome the low energy efficiency and indoor air temperature fluctuation issues of traditional ASHP systems.
APPLIED THERMAL ENGINEERING
(2022)
Article
Chemistry, Physical
Tao Xu, Fengping Wu, Ting Zou, Jintian Li, Jing Yang, Xiaoqing Zhou, Detao Liu, Yu Bie
Summary: This study investigates the use of diatomite-based shape-stabilized phase change material (SSCPCM) in floor radiant heating systems. By adding heat-treated diatomite as a supporting material, the stability and thermal performance of the phase change material are improved, making it potentially promising for applications.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Energy & Fuels
Zhenpeng Deng, Yongle Nian, Qun Liu, Wen -long Cheng
Summary: A novel PCM-grouted borehole heat exchanger (BHE) is proposed for all-season operation using a single shape-stabilized PCM (SSPCM) with phase change hysteresis (PCH). A heat transfer model considering PCH is established to evaluate the thermal performance of the BHE. Results show that octadecane SSPCM with PCH exhibits the best comprehensive performance, with energy storage rates of 68.9 W/m in heating and 75.9 W/m in cooling, higher than conventional BHE with backfill material.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
B. Gonzalez, M. M. Prieto
Summary: Radiant heating floors with PCMs offer a promising approach to improve energy efficiency in buildings by increasing thermal energy storage and reducing heat flux. The results of the study demonstrate the potential for PCM radiant floors to enhance comfort levels and save energy in practical applications.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Wanwan Fu, Wei Zhou, Geyun Lv, Rongtang Zhang, Hao Peng, Tao Fang, Jiesheng Liu, Weicheng Chen, Yutang Fang
Summary: A novel composite PCM for floor radiant heating was developed by adjusting the phase change temperature through the formation of noneutectic mixture. Sodium acetate trihydrate (SAT) was used as the main PCM, glycine as the temperature modifier, and Na2HPO4.12H2O as the nucleating agent. The addition of glycine and Na2HPO4.12H2O allowed for the regulation of the melting and crystallization behavior of the composite PCM, making it suitable for floor radiant heating.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Bin Wang, Wenhe Zhou, Jianyun Wu, Lei Sun, Meng Wang, Wenxiang Zhang
Summary: The heat storage and release characteristics of electric heating floors can be improved by introducing phase change material (PCM) to help utilize solar photovoltaic systems (PV), adjust electric power peaks and valleys, and enhance indoor thermal comfort.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Construction & Building Technology
Qunli Zhang, Zhaosheng Yang, Gang Wang
Summary: The floor heating system with PCM can increase floor thermal capacity and reduce indoor temperature fluctuation range. The phase change temperature and thermal conductivity of PCM have a significant influence on thermal comfort, while the latent heat has no obvious effect on the system's thermal performance.
INDOOR AND BUILT ENVIRONMENT
(2021)
Article
Construction & Building Technology
Oumayma Babaharra, Khadija Choukairy, Said Hamdaoui, Kaoutar Khallaki, Sanaa Hayani Mounir
Summary: The rapid growth of urbanization and the increase of internal comfort requirements negatively impact the environment and energy consumption in the building sector. Providing internal thermal comfort with environmentally friendly techniques is crucial. This study numerically investigates and evaluates the thermal performance of a heated floor incorporating a microencapsulated phase change material. The integration of a PCM in the floor aims to reduce energy consumption and stabilize internal temperature. Parameters such as microcapsules integration, mass fraction, tubes inter-distance, and PCM type are evaluated and discussed.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Ning Xie, Xuenong Gao, Yi Zhong, Rongda Ye, Shu Chen, Lixing Ding, Tianming Zhong
Summary: A novel composite PCM composed of modified Na2HPO4.12H2O and sepiolite fiber has been developed in this study, showing good thermal reliability and suitable phase change temperature for building energy conservation. The CPCM has high latent heat and can be used in floor systems for energy reduction purposes.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Thermodynamics
Hai Zhao, Puzhen Gao, Xiaochang Li, Ruifeng Tian, Hongyang Wei, Sichao Tan
Summary: This study numerically investigates the interaction between flow-induced vibration and forced convection heat transfer in a tube bundle. The results show that the impact of flow-induced vibration on heat transfer varies in different flow velocity regions.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Rohit Chintala, Jon Winkler, Sugirdhalakshmi Ramaraj, Xin Jin
Summary: The current state of fault detection and diagnosis for residential air-conditioning systems is expensive and not suitable for widespread implementation. This paper proposes a cost-effective solution by introducing an automated fault detection algorithm as a screening step before more expensive tests can be conducted. The algorithm uses home thermostats and local weather information to identify thermodynamic parameters and detect high-impact air-conditioning faults.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
A. Azimi, N. Basiri, M. Eslami
Summary: This paper presents a novel optimization algorithm for improving the water-film cooling system of photovoltaic panels, resulting in a significant increase in net energy generation.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Duc-Thuan Phung, Chin-Hsiang Cheng
Summary: In this study, a novel CFDMD model is used to analyze and investigate the behavior of thermal-lag engines (TLE). The study shows that the CFDMD model effectively captures the thermodynamic behavior of the working gas and the dynamic behavior of the engine mechanism. Additionally, the study explores the temporal evolution of engine speed and the influence of various parameters on shaft power and brake thermal efficiency. The research also reveals the existence of a thermal-lag phenomenon in TLE.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Haiying Yang, Yinjie Shen, Lin Li, Yichen Pan, Ping Yang
Summary: The purpose of this article is to find a measure to improve the interfacial thermal transfer of graphene/silicon heterojunction. Through molecular dynamics simulation, it is found that surface modification can significantly reduce the thermal resistance, thereby improving the thermal conductivity of the graphene/silicon interface.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Qiong Wu, Yancheng Wang, Haonan Zhou, Xingye Qiu, Deqing Mei
Summary: This article introduces a visible methanol steam reforming microreactor, which uses an optical crystal as an observation window and measures the reaction temperature in real-time using infrared thermography. The results show that under lower oxygen to carbon ratio conditions, the microreactor has a higher heating rate and a stable gradient in temperature distribution.
APPLIED THERMAL ENGINEERING
(2024)
Review
Thermodynamics
Giulia Manco, Umberto Tesio, Elisa Guelpa, Vittorio Verda
Summary: In the past decade, there has been a growing interest in studying energy systems for the combined management of power vectors. Most of the published works focus on finding the optimal design and operations of Multi Energy Systems (MES). However, for newcomers to this field, understanding how to achieve the desired optimization details while controlling computational expenses can be challenging and time-consuming. This paper presents a novel approach to analyzing the existing literature on MES, with the aim of guiding practical development of MES optimization. Through the discussion of six case studies, the authors provide a mathematical formulation as a reference for building the model and emphasize the impact of different aspects on the problem nature and solver selection. In addition, the paper also discusses the different approaches used in the literature for incorporating thermal networks and storage in the optimization of multi-energy systems.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xuepeng Yuan, Caiman Yan, Yunxian Huang, Yong Tang, Shiwei Zhang, Gong Chen
Summary: In this study, a multi-scale microgroove wick (MSMGW) was developed by laser irradiation, which demonstrated superior capillary performance. The surface morphology and performance of the wick were affected by laser scan pitch, laser power, repetition frequency, and scanning speed. The MSMGW showed optimal capillary performance in alumina material and DI water as the working fluid.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Maofei Mei, Feng Hu, Chong Han
Summary: This paper proposes an effective local search method based on detection of droplet boundaries for understanding the dynamic process of droplet growth during dropwise condensation. The method is validated by comparing with experimental data. The present simulation provides an effective approach to more accurately predict the nucleation site density in future studies.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Rahul Kumar Sharma, Ashish Kumar, Dibakar Rakshit
Summary: The study explores the use of phase change materials (PCM) as a retrofit with Heating Ventilation and Air-conditioning systems (HVAC) to reduce energy consumption and improve air quality. By incorporating PCM with specific thickness and fin configurations, significant energy savings can be achieved in comparison to standard HVAC systems utilizing R134a. This research provides policymakers with energy-efficient and sustainable solutions for HVAC systems to combat climate change.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Zhenhua Ren, Xiangjin Meng, Xingang Qi, Hui Jin, Yunan Chen, Bin Chen, Liejin Guo
Summary: This paper investigates the heat transfer mechanism and factors influencing thermal radiation in the process of supercritical water gasification (SCWG) of coal, and proposes a comprehensive numerical model to simulate the process. Experimental validation results show that thermal radiation accounts for a significant proportion of the total heat exchange in the reactor and a large amount of radiant energy exists in the important spectral range of supercritical water. Enhancing radiative heat transfer can effectively increase the temperature of the reaction medium and the gasification rate.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Mauro Abela, Mauro Mameli, Sauro Filippeschi, Brent S. Taft
Summary: Pulsating Heat Pipes (PHP) are passive two-phase heat transfer devices with a simple structure and high heat transfer capabilities. The actual unpredictability of their dynamic behavior during startup and thermal crisis hinders their large-scale application. An experimental apparatus is designed to investigate these phenomena systematically. The results show that increasing the number of evaporator sections and condenser temperature improves the performance of PHP. The condenser temperature also affects the initial liquid phase distribution and startup time.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Ke Gan, Ruilian Li, Yi Zheng, Hui Xu, Ying Gao, Jiajie Qian, Ziming Wei, Bin Kong, Hong Zhang
Summary: A 3-dimensional enhanced heat pipe radiator has been developed to improve heat dissipation and temperature uniformity in cooling high-power electronic components. Experimental results show that the radiator has superior heat transfer performance compared to a conventional aluminum fin radiator under different heating powers and wind speed conditions.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xinyi Zhang, Shuzhong Wang, Daihui Jiang, Zhiqiang Wu
Summary: This study focuses on recovering waste heat from blast furnace slag using dry centrifugal pelletizing technology. A comprehensive two-dimensional model was developed to analyze heat transfer dynamics and investigate factors influencing heat exchange efficiency. The findings have important implications for optimizing waste heat recovery and ensuring safe operations.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xincheng Wu, An Zou, Qiang Zhang, Zhaoguang Wang
Summary: The boosting heat generation rate of high-performance processors is challenging traditional cooling techniques. This study proposes a combined design of active jet intermittency and passive surface modification to enhance heat transfer.
APPLIED THERMAL ENGINEERING
(2024)