Article
Thermodynamics
Minwoo Lee, Jinyoung Kim, Hyun Ho Shin, Wonhee Cho, Yongchan Kim
Summary: The adoption of appropriate alternative refrigerants can effectively reduce the energy consumption and CO2 emissions of heat pump systems. However, there is limited investigation on alternative refrigerants for ground-source heat pump (GSHP) and solar-assisted ground-source heat pump (SGSHP) systems, which still use conventional refrigerants. This study compares the life cycle climate performance (LCCP) and primary energy consumption (PEC) of GSHP and SGSHP systems using conventional and alternative refrigerants, and suggests different optimal choices based on regional factors.
Review
Green & Sustainable Science & Technology
Tian You, Wei Wu, Hongxing Yang, Jiankun Liu, Xianting Li
Summary: The study reviews the hybrid PVT-GSHP technology, discussing the principles, configurations, and functions of different system categories. It also suggests future directions for improvement, including advanced ground heat exchangers, PVT types, hybrid systems, and optimal design for better performance.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Green & Sustainable Science & Technology
Anna Carmela Violante, Filippo Donato, Giambattista Guidi, Marco Proposito
Summary: This study evaluates the lifecycle environmental impacts of a ground source heat pump (GSHP) system compared to a traditional air-source heat pump (ASHP) system. The results show that the GSHP system has larger impacts during the manufacturing and installation phases, while the ASHP system has slightly higher impacts during the operational phase. Overall, the GSHP system is more energy-efficient and has a lower long-term environmental impact compared to a traditional air conditioning system.
Article
Geochemistry & Geophysics
Qing Zhang, Yunfeng Li, Jian Hua, Xiaonan Niu, Lili Hou, Zongfang Chen, Weiya Ge
Summary: Ground source heat pump is an efficient, clean, and environmentally friendly way to utilize shallow geothermal energy, providing a feasible basis for urban planning and development, and bringing significant economic and environmental benefits.
Article
Thermodynamics
Zhihang Zheng, Jin Zhou, Feng Xu, Rongpeng Zhang, Guang Deng
Summary: This study investigates the performance and feasibility of a PV-assisted ground source heat pump and air source heat pump system in hot summer and cold winter regions of China. The results show that the PVGSHP-ASHP system can effectively address load imbalance issues and achieve higher system efficiency, while also reducing costs.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Information Science & Library Science
Fabrizio Errico, Antonio Messeni Petruzzelli, Umberto Panniello, Angelo Scialpi
Summary: This study aims to explore the effects of received fundings and specialized competences on the R&D activities of start-ups. The results show that both the number and total amount of grants received by start-ups positively impact their innovative performance. The integration of grants with the presence of a high qualified team in the management board also contributes to the innovative performance.
JOURNAL OF KNOWLEDGE MANAGEMENT
(2023)
Article
Engineering, Electrical & Electronic
Dario Peralta, Claudio A. Canizares, Kankar Bhattacharya
Summary: This paper presents a mathematical model for a GSHP system with a vertical U-pipe GHX configuration to provide residential space heating/cooling and integrate multiple GSHPs into a load aggregator model. It proposes a two-stage operational strategy for the GSHP aggregator to participate in electricity markets and optimize the annual load dispatch, and demonstrates the feasibility and benefits of aggregated operation of GSHPs through numerical studies and comparisons with HVAC systems.
IEEE TRANSACTIONS ON SMART GRID
(2022)
Article
Green & Sustainable Science & Technology
Andrey Nikitin, Mahdi Deymi-Dashtebayaz, Sergei Muraveinikov, Veronika Nikitina, Reza Nazeri, Mehdi Farahnak
Summary: This paper compares the performance of air source and ground source cascade heat pumps using refrigerants with low global warming potential and zero ozone depletion potential in the top 10 coldest cities of Russia. The study investigates the effects of variations in temperature of the evaporator and cascade heat exchanger on the optimal operational conditions, through energy, exergy, economic, and environmental analysis using Pareto front curve. Findings indicate that Saint Petersburg is the best city for air source heat pump system, while ground source heat pump system is recommended for Khabarovsk city.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Construction & Building Technology
Chika Kaneko, Mika Yoshinaga
Summary: This study analyzed the long-term operational performance of a modular-type ground source heat pump (ASHP) combined with a ground source heat pump (GSHP) system installed at a university in a warmer region of Japan. The results showed that in warmer regions, the imbalance of ground heat balance is more likely due to the cooling load being greater than the heating load and the addition of electrical consumption heat from the GSHP to the rejection heat to the ground. The increase in ground temperature and decrease in the seasonal performance coefficient (SCOP) of the GSHP during cooling periods are caused by the predominant rejection into the ground for extraction from the ground. However, a decrease in the cooling load in one season significantly reduces the ground temperature during cooling in the following season. The module-type ASHP can quickly control its thermal output and react to HVAC load fluctuations before GSHP output control, which lowers the load factor of the GSHP and causes the ASHP to start and stop repeatedly at extremely low loads.
ENERGY AND BUILDINGS
(2023)
Article
Engineering, Aerospace
Sergey Dolgopolov, Olexiy D. Nikolayev, Nataliia Khoriak
Summary: The study found that asynchronous engine start-ups during rocket lift-off may cause severe nonlinear engine transients and clustered engine thrust misbalance, thus affecting the transient characteristics of the clustered feed system. Significant pressure dips at the pump inlet may lead to cavitation breakdowns of the pumps, disrupting the operation of the entire propulsion system.
PROPULSION AND POWER RESEARCH
(2021)
Article
Green & Sustainable Science & Technology
Abdullah Kapicioglu, Hikmet Esen
Summary: The use of renewable energy sources is increasing, but high setup costs limit the widespread use of ground source heat pump systems. This study examines the economic and environmental aspects of these systems in Turkey and proposes incentives to make them more attractive. The results show that ground source heat pump systems can reduce carbon emissions and their lifespan can be shortened with the implementation of incentives.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Green & Sustainable Science & Technology
Kun Zhou, Jinfeng Mao, Hua Zhang, Yong Li, Xiaojun Yu, Fei Chen, Min Li
Summary: This study focuses on the thermal and economic performance of a hybrid ground heat exchanger (HyGHE) for ground source heat pump systems. Through numerical modeling and techno-economic analysis, the optimal size and design strategy of HyGHE are determined. The results show that the costs and performance of the HyGHE system are influenced by different conditions and unit prices.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Thermodynamics
Yongbao Chen, Zhisen Chen, Zhe Chen, Xiaolei Yuan
Summary: This paper proposes an integrated energy system based on a solar-assisted ground source heat pump for heating rural houses, optimizing operational modes to improve energy efficiency and reduce electricity demand.
APPLIED THERMAL ENGINEERING
(2021)
Article
Energy & Fuels
Evangelos Bellos, Christos Tzivanidis
Summary: The study investigates a ground source heat pump system for space heating purposes with boreholes, examining ten parameters related to the heat pump cycle and the geothermal unit. The study highlights the system's performance under nominal design conditions and demonstrates the influence of the parameters on the overall system performance and geothermal characteristics.
Article
Thermodynamics
Saeid Mohammadzadeh Bina, Hikari Fujii, Shunsuke Tsuya, Hiroyuki Kosukegawa
Summary: The hybrid GSHP system utilizes supplemental energy sources to balance the load on the ground heat exchanger, improving system performance, especially in regions with imbalanced heating and cooling loads.
ENERGY CONVERSION AND MANAGEMENT
(2022)
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)