Article
Thermodynamics
Ying Lin, Yubin Fan, Meng Yu, Long Jiang, Xuejun Zhang
Summary: This study proposes a new air source heat pump system integrated with a latent heat thermal energy storage unit to enhance system performance in cold regions. Experimental and simulation results demonstrate the significant potential of this system for applications in extremely low temperatures.
Article
Construction & Building Technology
Haifei Chen, Wenying Fan, Baorui Cai, Guiqiang Li, Yunjie Wang, Yousef Golizadeh Akhlaghi, Yanlong Wang, Yutong Sun, Lvlin Jiang
Summary: This paper proposes a solar-air source energy storage heating system that can solve the problems of high energy consumption and difficult defrosting in low ambient temperatures. Experimental results show that the system can provide high-temperature hot water for buildings in severe cold environments and has lower operating costs and CO2 emissions than conventional heating systems.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Jielin Luo, Qin Wang, Kaiyin Yang, Zhen Zhao, Guangming Chen, Shaozhi Zhang
Summary: A novel heat pump using eco-friendly CO2/HC is proposed in this paper, which features independent regulation of operating parameters and reduces irreversible losses. The experimental results show that the novel heat pump has better heating performance and higher heating capacity, indicating its potential in reducing energy consumption and pollutant emission.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Thermodynamics
Jielin Luo, Kaiyin Yang, Zhen Zhao, Guangming Chen, Qin Wang
Summary: This research innovatively built a single-stage compound air-source heat pump and experimentally investigated its performance using CO2/R600a. The key factor affecting performance was found to be irreversible loss in the recuperator, and the compound heat pump showed higher energy efficiency and volumetric heating capacity under supply/return water temperatures of 75 degrees C/50 degrees C.
APPLIED THERMAL ENGINEERING
(2022)
Article
Construction & Building Technology
Wenlei Heng, Ziyun Wang, Yuling Wu
Summary: The experimental platform investigated the thermal storage capacity of phase change floor through different operation schemes and circulating water flow rates. The results demonstrated that the night operation scheme with appropriate water flow rate can achieve energy saving and peak regulation.
ENERGY AND BUILDINGS
(2021)
Article
Construction & Building Technology
Jiayu Ye, Long Ni
Summary: In order to ensure indoor air quality in severe cold regions, this study proposes an air source heat pump fresh air unit that mixes fresh air and return air. The mixing process is carried out in a mixing box, increasing the inlet air temperature of the condenser and ensuring energy-saving and stable operation. Experimental results show that the unit can operate continuously and stably with a fresh air volume of 700 m3/h and a supply air temperature of 24.0 degrees C. The heat pump COP reaches 4.29 at an outdoor temperature of 4.9 degrees C and 2.46 at -20.9 degrees C.
ENERGY AND BUILDINGS
(2023)
Article
Green & Sustainable Science & Technology
Panxue Liu, Jianhui Zhao, Jiamei Chen
Summary: By introducing phase-change thermal storage technology, the improved solar air-source heat pump heating system can effectively utilize solar energy, increase the efficiency of the solar collector, and save a significant amount of operating energy.
Article
Energy & Fuels
Johann Emhofer, Klemens Marx, Andreas Sporr, Tilman Barz, Birgo Nitsch, Michael Wiesflecker, Werner Pink
Summary: The study demonstrated the operation of a heat pump system with RPW-HEX in a laboratory setting, which stores heat energy in sensible energy for heating, cooling, and hot water generation. Testing showed high efficiency and the ability to provide higher average feed water temperatures compared to traditional systems.
Article
Computer Science, Information Systems
Jianhong Guo, Jinxiang Yu, Yibo Wang, Xiaoyu Zhang
Summary: This study proposes a distributed air source heat pump heating system based on phase change heat storage, which reduces operating costs by transferring heat load and utilizes peak-valley electricity pricing for control. Test results demonstrate that the system achieves decoupling between heating and power and reduces operating costs.
Review
Energy & Fuels
Zhaozhong Ning, Xuelai Zhang, Jun Ji, Yao Shi, Fulin Du
Summary: Combining phase change thermal storage technology with air-source heat pumps can enhance their performance and stability in low-temperature environment. This paper reviews the progress of phase change thermal storage technology in air-source heat pump systems, introduces its application in heating, defrosting, and electric peak-shaving, identifies the remaining challenges, and suggests the future research directions including selection of phase change materials, optimal design of heat accumulator structure, and multi-energy coupled thermal storage air-source heat pumps.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Green & Sustainable Science & Technology
Yubo Wang, Zhenhua Quan, Yaohua Zhao, Lincheng Wang, Heran Jing
Summary: This paper studies the feasibility of a coupled air and ground source heat pump system with energy storage for building energy supply. The system utilizes auxiliary heat sources to achieve high-performance heating and energy storage, while optimizing defrosting control and soil heat balance. It has economic and environmental advantages.
Article
Construction & Building Technology
Fuchun Yan, Penghui Gao, Xiangkui Gao, Haoyang Yan, Jianbo Teng, Zhiyong Li
Summary: In this study, the changes of near-surface soil phase transition and performance of GSHP system under extremely cold conditions were studied in a residential building in Harbin, China. The results showed that the change of soil temperature has an impact on the underground circulating water and the indoor supply and return water of the heat pump system. The coefficient of heating performance (COPh) of GSHP system decreased after a whole heating season. This study is important for the practical application of GSHP system in engineering.
ENERGY AND BUILDINGS
(2023)
Article
Thermodynamics
Qiang Ji, Zongwei Han, Xueping Zhang, Xiaoqing Sun, Gui Li, Xiuming Li, Lingyan Yang
Summary: ASACHHP is a novel heating technology that combines components from absorption and compression heat pumps to provide efficient heating performance, especially in low temperatures. It offers a better solution for heating systems in severe cold regions, with improved COP and applicability.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Hongwei Zhang, Xudong Geng, Shuangquan Shao, Chunqiang Si, Zhichao Wang
Summary: This paper investigates a R134a/CO2 cascade air source heat pump system for efficient and reliable heating in severe cold regions. The simulation model and experimental results demonstrate its excellent energy performance and ability to supply hot water with high COP under different working conditions.
Article
Green & Sustainable Science & Technology
Qiang Ji, Zongwei Han, Xiuming Li, Lingyan Yang
Summary: This study proposes a novel air source hybrid heating system driven by off-peak electric thermal storage, which can overcome the pollution and inefficiency issues of traditional heating systems and achieve efficient heating in cold regions. The research shows that the system has significant energy and economic advantages in the studied cities.
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)