Article
Thermodynamics
Zhangxiang Wu, Shijun You, Huan Zhang, Yaran Wang, Yan Jiang, Zhikai Liu, Li Sha, Shen Wei
Summary: The novel air-source absorption heat pump (ASAHP) for district heating proposed in this paper can operate efficiently at low ambient temperatures and recover waste heat effectively. With the falling film form in the generator and absorber, the system reduces mass flow rate and electricity consumption, making it suitable for cold regions and providing efficient heating capacity. Multiple-objective optimization is conducted using the TOPSIS decision-making method and NSGA-II technology to achieve optimal operating conditions.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Energy & Fuels
Xusheng Wang, Xiaonan Wu, Xingchen Yu
Summary: This study developed a SAGSHP system model using TRNSYS software and investigated the impact of parameters such as the start-stop temperature difference on the system performance. The study revealed that the variation in temperature between the start and stop of the collection cycle has a significant impact on the system's performance. The optimization parameters have different degrees of influence on the optimization results, ranked as V(i)>A(i)>T(s)>T(e).
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2023)
Article
Construction & Building Technology
Jiazheng Wang, Shuxue Xu, Guoyuan Ma, Qianqian Gou, Pu Zhao, Xiaoya Jia
Summary: This paper presents the design and application of a solar-driven heating and cooling system integrated with an air source heat pump for an ultra-low energy building. An emergy-based optimization method is used to obtain the optimal configuration of the compound parabolic concentrated-photovoltaic thermal collector, taking into account energy, social, environmental, and economic factors. The results show that the designed system consumes the lowest emergy when the photovoltaic coverage ratio is 1.0, leading to a 9.96% emergy savings compared to the reference system. The study also analyzes the emergy performance, monthly emergy performance, and the influence of investment cost and solar irradiation on the emergy performance of the system.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Anjan Rao Puttige, Staffan Andersson, Ronny oestin, Thomas Olofsson
Summary: This paper introduces a hybrid model that accurately represents the long-term behavior of a GSHP system using analytical and artificial neural network models, as well as a method to improve the operation of a hybrid GSHP. The study on hospital buildings in northern Sweden shows that in the improved scenario, heating costs can be reduced, CO2 emissions can be decreased, while maintaining stable ground temperature.
ENERGY AND BUILDINGS
(2022)
Article
Energy & Fuels
Yusheng Chen, Tong Guo, Josef Kainz, Martin Kriegel, Matthias Gaderer
Summary: The article introduces a multi-objective simulation-optimization framework based on genetic algorithm for designing integrated compression heat pump and gasifier cogeneration systems. Through appropriate optimization design, effective utilization of biomass resources can be achieved while ensuring the economic and environmental compatibility of the system.
Article
Thermodynamics
Jiangjiang Wang, Yuan Zhou, Xutao Zhang, Zherui Ma, Yuefen Gao, Boxiang Liu, Yanbo Qin
Summary: This study proposes a life cycle assessment-based optimization model for hybrid solar-assisted CCHP system, aiming to reduce environmental impacts through multi-objective optimization with robustness considerations. Partially covered collectors can lower environmental impact by optimizing system configurations and energy compositions, making them more cost-effective and feasible.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Green & Sustainable Science & Technology
Zhangxiang Wu, Li Sha, Yufeng Zhang
Summary: This study proposes a novel RCC and ORC double function system for district heating and power output. The system's thermal performance is analyzed using an energy model and verified with a test rig. Economic and environmental analysis is conducted, and multi-objective optimization is used to solve conflicting problems. Results show that the system has good feasibility and stability, providing efficient power output and heating capacity.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Construction & Building Technology
Wenzhe Wei, Chunsheng Wu, Long Ni, Wei Wang, Zongxi Han, Wenjun Zou, Yang Yao
Summary: In recent years, the application of air source heat pumps in centralized heating in North China has rapidly increased. However, there is a lack of theoretical investigation on the control methods of water pumps. This study established a mathematical model of variable-frequency air source heat pumps for heating and proposed three control methods for water pumps. The heating performance of the system and appropriate control methods for heating terminals were analyzed. The results showed that the power input of the water pump was the minimum in the pressure differential control method, and the power input of the ASHP system decreased by an average of 13.40% compared to the constant flow control method.
ENERGY AND BUILDINGS
(2022)
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
Green & Sustainable Science & Technology
Jingyong Cai, Haihua Zhou, Lijie Xu, Zhengrong Shi, Tao Zhang
Summary: This paper proposes a solar-air composite source multi-functional heat pump capable of space heating, domestic water heating, space cooling, heat storage, and defrosting. Two different control schemes are developed for optimizing its performance under different working conditions. The results indicate that the choice of control scheme should vary depending on the solar irradiation and heating mode.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
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
Construction & Building Technology
Hongzhou Xia, Jie Chen, Jianxin Yuan, Yafei Wang
Summary: Integrating solar energy with direct heating and cooling (DHC) systems can improve efficiency and reduce emissions. An exergoeconomic analysis and optimization model combined with building loads and environmental parameters is proposed to assist in better selecting a DHC system for buildings.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Thermodynamics
Ling-Ling Li, Xin-Yu Ren, Ming-Lang Tseng, Ding-Shan Wu, Ming K. Lim
Summary: This study developed a mathematical model to optimize the configuration of a hybrid system combining solar thermal and photovoltaic technologies with combined cooling, heating, and power functions. The results showed that compared to other strategies, adopting the proposed strategy achieved better energy savings and carbon emission reductions.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Energy & Fuels
Zhiguo Wang, Haoyu Chen, Xiao Sun, Haibing Lu, Tianyi Wang
Summary: Dealing with the severe energy and climate change situation, reducing carbon emissions and developing new energy sources have become a global consensus. The design of clean energy heating systems, such as solar collectors and air source heat pumps, has received widespread attention. However, optimizing parameters in hybrid heating systems, like solar-air hybrid source heat pumps, that interact with each other remains challenging and requires further study. Using the TRNSYS simulation platform, performance parameters were modified to reduce annual costs with the particle swarm optimization and coordinate search method. The results show significant enhancements in system performance using both algorithms.
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
Yong Cheng, Fukai Song, Lei Fu, Saishuai Dai, Zhiming Yuan, Atilla Incecik
Summary: This paper investigates the accessibility of wave energy absorption by a dual-pontoon floating breakwater integrated with hybrid-type wave energy converters (WECs) and proposes a hydraulic-pneumatic complementary energy extraction method. The performance of the system is validated through experiments and comparative analysis.
Article
Thermodynamics
Jing Gao, Chao Wang, Zhanwu Wang, Jin Lin, Runkai Zhang, Xin Wu, Guangyin Xu, Zhenfeng Wang
Summary: This study aims to establish a new integrated method for biomass cogeneration project site selection, with a focus on the application of the model in Henan Province. By integrating Geographic Information System and Multiple Criterion Decision Making methods, the study conducts site selection in two stages, providing a theoretical reference for the construction of biomass cogeneration projects.
Article
Thermodynamics
Mert Temiz, Ibrahim Dincer
Summary: The current study presents a hybrid small modular nuclear reactor and solar-based system for sustainable communities, integrating floating and bifacial photovoltaic arrays with a small modular reactor. The system efficiently generates power, hydrogen, ammonia, freshwater, and heat for residential, agricultural, and aquaculture facilities. Thermodynamic analysis shows high energy and exergy efficiencies, as well as large-scale ammonia production meeting the needs of metropolitan areas. The hybridization of nuclear and solar technologies offers advantages of reliability, environmental friendliness, and cost efficiency compared to renewable-alone and fossil-based systems.
Editorial Material
Thermodynamics
Wojciech Stanek, Wojciech Adamczyk
Article
Thermodynamics
Desheng Xu, Yanfeng Li, Tianmei Du, Hua Zhong, Youbo Huang, Lei Li, Xiangling Duanmu
Summary: This study investigates the optimization of hybrid mechanical-natural ventilation for smoke control in complex metro stations. The results show that atrium fires are more significantly impacted by outdoor temperature variations compared to concourse/platform fires. The gathered high-temperature smoke inside the atrium can reach up to 900 K under a 5 MW train fire energy release. The findings provide crucial engineering insights into integrating weather data and adaptable ventilation protocols for smoke prevention/mitigation.
Article
Thermodynamics
Da Guo, Heping Xie, Mingzhong Gao, Jianan Li, Zhiqiang He, Ling Chen, Cong Li, Le Zhao, Dingming Wang, Yiwei Zhang, Xin Fang, Guikang Liu, Zhongya Zhou, Lin Dai
Summary: This study proposes a new in-situ pressure-preserved coring tool and elaborates its pressure-preserving mechanism. The experimental and field test results demonstrate that this tool has a high pressure-preservation capability and can maintain a stable pressure in deep wells. This study provides a theoretical framework and design standards for the development of similar technologies.
Article
Thermodynamics
Aolin Lai, Qunwei Wang
Summary: This study assesses the impact of China's de-capacity policy on renewable energy development efficiency (REDE) using the Global-MSBM model and the difference-in-differences method. The findings indicate that the policy significantly enhances REDE, promoting technological advancements and marketization. Moreover, regions with stricter environmental regulations experience a higher impact.
Article
Thermodynamics
Mostafa Ghasemi, Hegazy Rezk
Summary: This study utilizes fuzzy modeling and optimization to enhance the performance of microbial fuel cells (MFCs). By simulating and analyzing experimental data sets, the ideal parameter values for increasing power density, COD elimination, and coulombic efficiency were determined. The results demonstrate that the fuzzy model and optimization methods can significantly improve the performance of MFCs.
Article
Thermodynamics
Zhang Ruan, Lianzhong Huang, Kai Wang, Ranqi Ma, Zhongyi Wang, Rui Zhang, Haoyang Zhao, Cong Wang
Summary: This paper proposes a grey box model for fuel consumption prediction of wing-diesel hybrid vessels based on feature construction. By using both parallel and series grey box modeling methods and six machine learning algorithms, twelve combinations of prediction models are established. A feature construction method based on the aerodynamic performance of the wing and the energy relationship of the hybrid system is introduced. The best combination is obtained by considering the root mean square error, and it shows improved accuracy compared to the white box model. The proposed grey box model can accurately predict the daily fuel consumption of wing-diesel hybrid vessels, contributing to operational optimization and the greenization and decarbonization of the shipping industry.
Article
Thermodynamics
Huayi Chang, Nico Heerink, Junbiao Zhang, Ke He
Summary: This study examines the interaction between off-farm employment decisions between couples and household clean energy consumption in rural China, and finds that two-paycheck households are more likely to consume clean energy. The off-farm employment of women is a key factor driving household clean energy consumption to a higher level, with wage-employed wives having a stronger influence on these decisions than self-employed ones.
Article
Thermodynamics
Hanguan Wen, Xiufeng Liu, Ming Yang, Bo Lei, Xu Cheng, Zhe Chen
Summary: Demand-side management is crucial to smart energy systems. This paper proposes a data-driven approach to understand the relationship between energy consumption patterns and household characteristics for better DSM services. The proposed method uses a clustering algorithm to generate optimal customer groups for DSM and a deep learning model for training. The model can predict the possibility of DSM membership for a given household. The results demonstrate the usefulness of weekly energy consumption data and household socio-demographic information for distinguishing consumer groups and the potential for targeted DSM strategies.
Article
Thermodynamics
Xinglan Hou, Xiuping Zhong, Shuaishuai Nie, Yafei Wang, Guigang Tu, Yingrui Ma, Kunyan Liu, Chen Chen
Summary: This study explores the feasibility of utilizing a multi-level horizontal branch well heat recovery system in the Qiabuqia geothermal field. The research systematically investigates the effects of various engineering parameters on production temperature, establishes mathematical models to describe their relationships, and evaluates the economic viability of the system. The findings demonstrate the significant economic feasibility of the multi-level branch well system.
Article
Thermodynamics
Longxin Zhang, Songtao Wang, Site Hu
Summary: This investigation reveals the influence of tip leakage flow on the modern transonic rotor and finds that the increase of tip clearance size leads to a decline in rotor performance. However, an optimal tip clearance size can extend the rotor's stall margin.
Article
Thermodynamics
Kristian Gjoka, Behzad Rismanchi, Robert H. Crawford
Summary: This paper proposes a framework for assessing the performance of 5GDHC systems and demonstrates it through a case study in a university campus in Melbourne, Australia. The results show that 5GDHC systems are a cost-effective and environmentally viable solution in mild climates, and their successful implementation in Australia can create new market opportunities and potential adoption in other countries with similar climatic conditions.
Article
Thermodynamics
Jianwei Li, Guotai Wang, Panpan Yang, Yongshuang Wen, Leian Zhang, Rujun Song, Chengwei Hou
Summary: This study proposes an orientation-adaptive electromagnetic energy harvester by introducing a rotatable bluff body, which allows for self-regulation to cater for changing wind flow direction. Experimental results show that the output power of the energy harvester can be greatly enhanced with increased rotatory inertia of the rotating bluff body, providing a promising solution for harnessing wind-induced vibration energy.