Article
Thermodynamics
Yuzhu Chen, Huilian Hua, Jun Wang, Peter D. Lund
Summary: This study investigates the implementation of an integrated hybrid system in district heating, utilizing concentrating photovoltaic/thermal collectors, geothermal, and absorption heat pumps. The modified thermo-ecological cost method is used for system optimization, highlighting the positive effects of higher solar irradiance levels and PV coverage ratios on thermal performance.
Article
Thermodynamics
Xiong Zhang
Summary: This study establishes heat transfer and energy conversion models for MDGHP systems, investigates the influence of key design and control parameters on the system's performance, and proposes optimization strategies for system efficiency.
APPLIED THERMAL ENGINEERING
(2021)
Review
Energy & Fuels
Kutbay Sezen, Afsin Gungor
Summary: Solar assisted heat pump (SAHP) systems have gained popularity due to their improved performance by utilizing solar energy. This study reviews 77 recent studies to compare SAHP systems in terms of performance, structure, and cost, and recommends direct expansion systems for optimal utilization of solar and air as heat sources under solar irradiation below 400 W/m2.
Article
Green & Sustainable Science & Technology
Marco Noro
Summary: This paper evaluates the possibility of using evacuated tube collectors to drive an absorption heat pump as a chiller, considering both energy and economic aspects. The results show that the best plant configuration achieves a primary energy ratio of 4.75 in a cold and cloudy climate, and 5.9 in a warmer and clearer sky climate. An economic analysis on the actual investment costs is also presented, taking into account cost reduction based on recent price lists.
Article
Construction & Building Technology
Oguz Arslan, Asli Ergenekon Arslan, Taqiy Eddine Boukelia
Summary: A new residential heat pump system was designed for domestic use in the geothermal district heating system. The system integrated a heat pump into the substations of the residences, using a thermal energy storage unit instead of a conventional evaporator. Various systems were analyzed thermodynamically, and the most suitable system was determined through a multi-criteria decision-making analysis. The results showed that the designed system had a favorable NPV value, exergy efficiency, and CO2 reduction.
ENERGY AND BUILDINGS
(2023)
Article
Chemistry, Physical
Chuanhui Zhu, Shubin Yan, Xiaodong Dong, Wei Zhang, Biyi Huang, Yang Cui
Summary: With the rapid development of industrialization, the excessive use of fossil fuels has caused issues like increased greenhouse gas emissions and energy shortages, leading to a shift towards the development and utilization of renewable energy. Solar heat pump heating technology has become the development direction for clean heating in northern regions in winter, but faces challenges due to the intermittent nature of solar energy and the impact of low-valley electricity policies.
Article
Thermodynamics
Hauke Hirsch, Andreas Nicolai
Summary: This paper presents a novel thermo-hydraulic network model for large 5th generation district heating and cooling networks. The model takes into account the current flow regime and temperature dependency of viscosity, improving accuracy and performance compared to existing models. The model is implemented using an error-controlled, adaptive time step solver and made available as open-source.
Article
Thermodynamics
Fabrizio Leonforte, Alessandro Miglioli, Niccolo Aste, Nicolo Cristiani, Lorenzo Croci, Giorgio Besagni, Claudio Del Pero
Summary: This study proposes a novel solar-assisted multifunctional heat pump that can meet the heating, cooling, and hot water needs of residential buildings, improving energy efficiency and reducing reliance on the grid. It provides a practical solution for decarbonizing the residential sector.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
S. Bordignon, D. Quaggiotto, J. Vivian, G. Emmi, M. De Carli, A. Zarrella
Summary: This study proposes a new technical solution for providing air conditioning, domestic hot water, and electricity to a small residential district in heating-dominant regions. The solution includes the use of high-efficiency ground source heat pump, booster heat pumps, and rooftop photovoltaic thermal panels. The proposed system achieves high performance and utilizes multiple energy sources effectively.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Thermodynamics
Sameh Agrebi, Ridha Chargui, Bourhan Tashtoush, AmenAllah Guizani
Summary: This study presents a comparative investigation of a solar-assisted heat pump and a conventional heat pump heating system, utilizing numerical and experimental studies. Results show that the solar collector significantly affects the performance of the water-water heat pump, providing sufficient heating for greenhouse in winter.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2021)
Article
Construction & Building Technology
Chandan Swaroop Meena, Amit Nandan Prajapati, Ashwani Kumar, Manoj Kumar
Summary: This manuscript presents a study on flow escalation for a Solar Assisted Heat Pump Water Heater (SAHPWH) based on experimental data, aiming to increase building energy efficiency. The experiments showed that using single glazing can achieve the same heat gains, and a specific solar assisted heat pump system was tested to supply a large amount of hot water in a short time. The study also found a relationship between the collector efficiency factor, absorber, and tube spacing.
Article
Energy & Fuels
Nelson Sommerfeldt, Joshua M. Pearce
Summary: This study quantifies the techno-economic potential of using solar photovoltaics (PV) to support heat pumps (HP) for replacing natural gas heating in North American residences. Simulations compare different heating systems, including PV with grid electricity and HP with grid electricity, to identify conditions for lower life cycle cost. The results show that PV becomes a hedge against rising prices when inflation rates are high or PV capital costs are low, increasing the adoption of HPs and reducing carbon emissions. The study also discusses the impact on energy policy, such as rebates and utility business models.
Article
Thermodynamics
Fangtian Sun, Baoru Hao, Lin Fu, Hongwei Wu, Yonghua Xie, Haifeng Wu
Summary: The development of geothermal heat for district heating in China has attracted significant attention, with a new system proposed to address long-distance transportation issues. The system has a cost-effective main line length of about 10 km and shows improvements in annual coefficient of performance and annual product exergy efficiency. The centralized absorption heat transformer plays a key role in reducing irreversible loss and enhancing performance.
Article
Thermodynamics
Hua Yang, Xiaoyun Wang, Sheng Yao
Summary: This study introduces a new method of combining solar photovoltaic thermal collector with switchable air source heat pump system to improve the power generation efficiency of photovoltaic panels and effectively utilize solar thermal energy. It is found that R717 is the optimal working fluid, and the system has a high annual energy utilization coefficient and exergy efficiency.
APPLIED THERMAL ENGINEERING
(2023)
Article
Construction & Building Technology
Filippo Padovani, Nelson Sommerfeldt, Francesca Longobardi, Joshua M. Pearce
Summary: This study quantifies the techno-economic characteristics of sustainable heating electrification in isolated rural, residential buildings in cold climates without natural gas supply, showing that combining solar PV with heat pumps can reduce residential building GHG emissions and potentially achieve significant reductions in building emissions over time.
ENERGY AND BUILDINGS
(2021)
Article
Chemistry, Physical
M. A. K. Yousaf Shah, Yuzheng Lu, Naveed Mushtaq, Muhammad Yousaf, Peter D. Lund, Muhammad Imran Asghar, Bin Zhu
Summary: Reducing the operational temperature of solid oxide fuel cells (SOFC) is important for enhancing their durability and lifetime. A new electrolyte layer made of gadolinium-doped ceria (GDC) was synthesized using a wet chemical co-precipitation technique, demonstrating impressive fuel cell performance, high ionic conductivity, and better stability at a low temperature of 450 degrees C. This study suggests the possibility of designing new electrolytes for advanced low-temperature fuel cell technology.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Engineering, Chemical
M. A. K. Yousaf Shah, Yuzheng Lu, Naveed Mushtaq, Muhammad Yousaf, Muhammad Akbar, Sajid Rauf, Yiwang Dong, Peter D. Lund, Bin Zhu, Muhammad Imran Asghar
Summary: This study focuses on designing a Co/Fe-SrTiO3 semiconductor perovskite as an electrolyte membrane to enhance its ionic conduction. Through surface-enriched O-vacancies, the doped Co/Fe lowers the Fermi level, leading to improved ionic conductivity. The designed electrolyte exhibits high ionic conductivity (0.19 S/cm) and enables a fuel cell to achieve a maximum power density of 1016 mW/cm2 at 520 degrees C. The surface doping of Co/Fe facilitates enriched surface channels for quick ion transportation with lower activation energy, making it a suitable approach for developing advanced materials for wide bandgap semiconductors with high ionic conductivity for next-generation CFCs.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Thermodynamics
Gong Jing-hu, Li Yong, Wang Jun, Peter Lund
Summary: A multi-stage heating technology is proposed to improve the efficiency and outlet temperature by using multiple absorber tubes that increase the temperature from 300 degrees C to 580 degrees C. The large-aperture multi-stage PTC solar power in Dunhuang, China, has an annual average solar-to-electric efficiency of 24.50%, higher than the current 20%. Homogenizing the solar radiation flux at the high-temperature section can reduce the length of the high-temperature region and increase the thermal efficiency.
Article
Engineering, Industrial
Justinas Jasiunas, Tatu Heikkinen, Peter D. Lund, Ilona Lang-Ritter
Summary: A small number of strong windstorms can cause major power interruptions and potentially shift the strategic direction of energy system development. Existing analysis tools do not effectively capture the effects on distribution grids over large areas with diverse environments. This paper presents a national-scale power disruption model that integrates synthetically generated power grids, consumption profiles, fragility functions, and windstorm severity dependent fixing times to accurately reproduce historical outage data.
RELIABILITY ENGINEERING & SYSTEM SAFETY
(2023)
Article
Green & Sustainable Science & Technology
Yuekuan Zhou, Peter D. Lund
Summary: P2P energy sharing can complement other energy management strategies in the transition to clean energy. Advances in AI, machine learning, and IoT provide solutions for efficient P2P energy sharing and trading. This review covers system configurations, pricing mechanisms, and decision-making in dynamic P2P energy trading along with collaboration and operations among stakeholders.
Article
Energy & Fuels
Jing-hu Gong, Zhi-hao Sun, Jun Wang, Peter D. Lund
Summary: In this study, a metal heat pipe is replaced with a glass heat pipe to address the sealing problem in the joint between the glass outer layer and the metal. A reflective film is added to the lower part of the outer tube to improve energy efficiency. The results show that the all-glass structure can cope with transient local heating changes and adding a reflective film increases optical efficiency and energy output.
Article
Energy & Fuels
Justinas Jasiunas, Ilona Lang-Ritter, Tatu Heikkinen, Peter D. D. Lund
Summary: Most existing models for estimating electric system impacts from windstorms tend to have a detailed representation of only the electric or meteorological system. This study explores the evidence of a fragility-based model's ability to generate realistic spatiotemporal lost load profiles for impactful windstorm cases in Finland. The analysis of interruption data for thirteen years shows that most faults fall within the 20% uncertainty bounds of severity-dependent distribution trendlines. The generated profiles recreate historic profiles within an error margin of approximately 20%.
Article
Thermodynamics
Jing-hu Gong, Zhi-peng Zhang, Zhi-hao Sun, Yu-guang Wang, Jun Wang, Peter D. Lund
Summary: This article introduces a completely unique pass-through all-glass evacuated collector tube, which has a simple structure and can improve heat transfer efficiency and thermal energy utilization.
Article
Electrochemistry
Buse Bilbey, M. Imran Asghar, Leyla Colakerol Arslan, Peter D. D. Lund, Aligul Buyukaksoy
Summary: The perovskite-structured mixed ionic and electronic conducting material lanthanum strontium ferrite (LSF) has shown potential for an anode in solid oxide fuel cell (SOFC). The study found that the 6LSF composition exhibited lower polarization resistance and higher porosity compared to 8LSF, indicating better anode performance.
Article
Chemistry, Physical
Xuelan Hou, Hang Zhang, Ramesh Raju, Yongdan Li, Peter D. Lund
Summary: Improving light absorption and conversion ability is crucial for enhancing the performance of photoelectrochemical (PEC) cells in converting solar radiation into chemical energy. This study demonstrates a simple and low-cost method to prepare a nanostructured TiOx film with tunable absorption range from 250 to 2500 nm, surpassing the absorption edge of TiO2. The film shows superior light capture ability and a 10-fold increase in charge carrier transfer rate under AM 1.5 G light. It has potential for large-area PEC cells with promoted charge carriers' transfer.
JOURNAL OF POWER SOURCES
(2023)
Article
Environmental Studies
Zhicheng Xu, Jun Wang, Peter D. Lund, Yaoming Zhang
Summary: This paper implements data-driven modeling and analysis of energy consumption based on low-frequency real-world electric bus data. The study identifies and calculates two quantitative metrics of energy consumption and establishes supervised learning models to predict energy consumption. The relationship between factors such as temperature, driver/vehicle-related, and road-related factors and energy consumption is explained through quantitative and qualitative analysis.
TRANSPORTATION RESEARCH PART D-TRANSPORT AND ENVIRONMENT
(2023)
Article
Energy & Fuels
Bingkun Huang, Shimi Yang, Xiuxiu Li, Jun Wang, Peter D. Lund
Summary: Phase change materials (PCMs) are effective for thermal energy storage and supply-demand balance. Numerical analyses were performed to improve the melting-solidification process in PCMs using a 2-D cavity with two heat sources and wavy sinusoidal fins. The influence of different fin arrangements was analyzed.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Chemistry, Physical
M. A. K. Yousaf Shah, Yuzheng Lu, Naveed Mushtaq, Muhammad Yousaf, Peter D. Lund, Muhammad Imran Asghar, Bin Zhu
Summary: Reducing the operational temperature of solid oxide fuel cells (SOFC) is crucial for improving their durability and lifetime. Gadolinium-doped ceria (GDC) synthesized through a wet chemical co-precipitation technique shows impressive fuel cell performance and high ionic conductivity at a shallow temperature of 450 degrees C. The utilization of GDC as an electrolyte in low-temperature solid oxide fuel cells (LTSOFCs) demonstrates potential for developing advanced low-temperature fuel cell technology.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Green & Sustainable Science & Technology
Zhen Li, Jianke Hu, Yifeng Han, Hefeng Li, Jun Wang, Peter D. Lund
Summary: The aim of this study is to propose a high-accuracy simulation model for photovoltaic modules by combining analytical and metaheuristic algorithms. The artificial hummingbird algorithm is found to have higher accuracy in extracting parameters compared to other algorithms. The proposed model corrects the parameters using the analytical method and adds an ideal factor correction to address nonlinear deviations. The model achieves a low root mean squared error between simulated and measured current data.
Article
Materials Science, Multidisciplinary
Sanaz Zarabi Golkhatmi, Peter D. Lund, Muhammad Imran Asghar
Summary: Inkjet printing is a fabrication technique that can tailor the electrode microstructure of solid oxide fuel cells. By optimizing ink composition and characteristics, and comparing with drop-casting, it was found that inkjet printing can provide hierarchical porous microstructure, increase reaction sites, and significantly improve fuel cell performance.
MATERIALS ADVANCES
(2024)
Article
Thermodynamics
Pengcheng Zhao, Jingang Wang, Liming Sun, Yun Li, Haiting Xia, Wei He
Summary: The production of green hydrogen through water electrolysis is crucial for renewable energy utilization and decarbonization. This research explores the optimal electrode configuration and system design of compactly-assembled industrial electrolyzer. The findings provide valuable insights for industrial application of water electrolysis equipment.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
V. Baiju, P. Abhishek, S. Harikrishnan
Summary: Thermally driven adsorption desalination systems (ADS) have gained attention as an eco-friendly solution for water scarcity. However, they face challenges related to low water productivity and scalability. To overcome these challenges, integrating ADS with other desalination technologies can create a small-scale hybrid system. This study proposes integrating ADS with a Thermo Electric Dehumidification (TED) unit to enhance its performance.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
C. X. He, Y. H. Liu, X. Y. Huang, S. B. Wan, Q. Chen, J. Sun, T. S. Zhao
Summary: A decentralized centroid multi-path RC network model is constructed to improve the temperature prediction accuracy compared to traditional RC models. By incorporating multiple heat flow paths and decentralizing thermal capacity, a more accurate prediction is achieved.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Chaoying Li, Meng Wang, Nana Li, Di Gu, Chao Yan, Dandan Yuan, Hong Jiang, Baohui Wang, Xirui Wang
Summary: There is an urgent need to shift away from heavy dependence on fossil fuels and embrace renewable energy sources, particularly in the energy-intensive oil refining process. This study presents an innovative concept called the Solar Oil Refinery, which applies solar energy in oil refining. A solar multi-energies-driven hybrid chemical oil refining system that utilizes solar pyrolysis and electrolysis has been developed, significantly improving solar utilization efficiency, cracking rate, and hydrogen yield.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Chao Ma, Guanghui Wang, Dingbiao Wang, Xu Peng, Yushen Yang, Xinxin Liu, Chongrui Yang, Jiaheng Chen
Summary: This study proposes a bio-inspired fish-tail wind rotor to improve the wind power efficiency of the traditional Savonius rotor. Through transient simulations and orthogonal experiments, the key factors affecting the performance are identified. A response surface model is constructed to optimize the power coefficient, resulting in an improvement of 9.4% and 6.6% compared to the Savonius rotor.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Sina Bahmanziari, Abbas-Ali Zamani
Summary: This paper proposes a new framework for improving electrical energy harvesting from piezoelectric smart tiles through a combination of magnetic plucking, mechanical impact, and mechanical vibration force mechanisms. Experimental results demonstrate a significant increase in energy yield and average energy harvesting time compared to other mechanisms.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Nanjiang Dong, Tao Zhang, Rui Wang
Summary: This study establishes a multiobjective mixed-variable configuration optimization model for a comprehensive combined cooling, heating, and power energy system, and proposes an efficient generating operator to optimize this model. The experimental results show that the proposed algorithm performs better than other state-of-the-art algorithms.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Ahmed E. Mansy, Eman A. El Desouky, Tarek H. Taha, M. A. Abu-Saied, Hamada El-Gendi, Ranya A. Amer, Zhen-Yu Tian
Summary: This study aims to convert office paper waste into bioethanol through a sustainable pathway. The results show that physiochemical and enzymatic hydrolysis of the waste can yield a high glucose concentration. The optimal conditions were determined using the Box-Behnken design, and a blended membrane was used for ethanol purification.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Sven Klute, Marcus Budt, Mathias van Beek, Christian Doetsch
Summary: Heat pumps are crucial for decarbonizing heat supply, and steam generating heat pumps have the potential to decarbonize the industrial sector. This paper presents the current state, technical and economic data, and modeling principles of steam generating heat pumps.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Le Zhang, To-Hung Tsui, Yen Wah Tong, Pruk Aggarangsi, Ronghou Liu
Summary: This study investigates the effectiveness of a current-carrying-coil-based magnetic field in promoting anaerobic digestion of chicken manure. The results show that the applied magnetic field increases methane yield, decreases carbon dioxide production, and reduces the concentration of ammonia nitrogen. Microbial community analysis reveals the enrichment of certain methanogenic genera and enhanced metabolic pathways. Pilot-scale experiments confirm the technical effectiveness of the magnetic field assistance in enhancing anaerobic digestion of chicken manure.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Bo Chen, Ruiqing Ma, Yang Zhou, Rui Ma, Wentao Jiang, Fan Yang
Summary: This paper presents an advanced energy management strategy for fuel cell hybrid electric heavy-duty vehicles, focusing on speed planning and energy allocation. By utilizing predictive co-optimization control, this strategy ensures safe inter-vehicle distance and minimizes energy demand. Simulation results demonstrate the effectiveness of the proposed method in reducing fuel cell degradation cost and overall operation cost.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Fabio Fatigati, Roberto Cipollone
Summary: Organic Rankine Cycle-based microcogeneration systems that use solar sources to generate electricity and hot water can help reduce CO2 emissions in residential energy-intensive sectors. The adoption of a recuperative heat exchanger in these systems improves efficiency, reduces thermal power requirements, and saves on electricity costs.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Lipeng He, Renwen Liu, Xuejin Liu, Xiaotian Zheng, Limin Zhang, Jieqiong Lin
Summary: This research proposes a piezoelectric-electromagnetic hybrid energy harvester (PEHEH) for low-frequency wave motion and self-sensing wave environment monitoring. The PEHEH shows promising power output and the ability to self-power and self-sense the wave environment.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Shangling Chu, Yang Liu, Zipeng Xu, Heng Zhang, Haiping Chen, Dan Gao
Summary: This paper studies a distributed energy system integrated with solar and natural gas, analyzes the impact of different parameters on its energy utilization and emissions reduction, and obtains the optimal solution through an optimization algorithm. The results show that compared to traditional separation production systems, this integrated system achieves higher energy utilization and greater reduction in carbon emissions.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Qingpu Li, Yaqi Ding, Guangming Chen, Yongmei Xuan, Neng Gao, Nian Li, Xinyue Hao
Summary: This paper proposes and studies a piston-type thermally-driven pump with a structure similar to a linear compressor, aiming to eliminate the high-quality energy consumption of existing pumps and replace mechanical pumps. The coupling mechanism of working fluid flow and element dimension is analyzed based on force analysis, and experimental data analysis is used to determine the pump operation stroke. Theoretical simulation is conducted to analyze the correlation mechanism of the piston assembly. The research shows that the thermally-driven pump can greatly reduce power consumption and has potential for industrial applications.
ENERGY CONVERSION AND MANAGEMENT
(2024)
