Article
Green & Sustainable Science & Technology
Jere Knuutinen, Herman Book, Vesa Ruuskanen, Antti Kosonen, Paula Immonen, Jero Ahola
Summary: This paper examines four different control methods for DHW heating in a building with a GSHP and a PV system. The main control method aims to minimize DHW heating costs by utilizing market information and PV production output forecast, showing significant cost savings even with forecasting errors.
Review
Thermodynamics
Li Wei Yang, Rong Ji Xu, Nan Hua, Yu Xia, Wen Bin Zhou, Tong Yang, Yerzhan Belyayev, Hua Sheng Wang
Summary: Solar assisted air source heat pump technology is considered a promising energy-saving heating solution in residential areas, with potential for applications in hot water supply, space heating, and cooling. The performance evaluation of this technology involves various parameters at system and component levels, influenced by factors such as system configuration, component size, working conditions, and weather conditions. Further research is needed to improve performance and reduce initial costs for wider adoption and competitiveness compared to existing hydrocarbon-based heating systems.
ENERGY CONVERSION AND MANAGEMENT
(2021)
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
Thermodynamics
Kadir Bakirci, Bedri Yuksel
Summary: A simulation study of the solar-source heat pump system was conducted, investigating the performance of the designed system both experimentally and theoretically. The developed model corresponded well with the experimental data, with differences in performance values being around 8% and 5% for COP and COPS, respectively.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Energy & Fuels
Nezir Yagiz Cam, Ersin Alptekin, Levent Bilir, Mehmet Akif Ezan
Summary: This study investigates the performance of a solar-assisted latent heat thermal energy storage (LHTES) unit integrated with a heat pump under variable weather conditions. The use of phase change materials (PCMs) with specific melting temperatures and latent heat of fusions is studied. Results show that the integration of the solar-aided LHTES unit with the heat pump increases the heat pump's coefficient of performance (COP) and significantly reduces the operating costs of the heating device.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Thermodynamics
Cagatay Yildiz, Mustafa Secilmis, Muslum Arici, Mehmet Selcuk Mert, Sandro Nizetic, Hasan Karabay
Summary: Considering the intermittent nature of solar energy and its usage even in the absence of sunlight, this study evaluates the thermal performance of a water-to-water heat pump system with a thermal energy storage unit. By designing and integrating a thermal energy storage unit into a heat pump experimental rig, the effects of different flow rates and water temperatures, as well as the inclusion of phase change material, are analyzed. The results show that the inclusion of phase change material can significantly improve heating time and coefficient of performance, but the impact varies depending on the water temperature. The trade-off between sensible and latent heat storage is emphasized in this study.
Article
Thermodynamics
M. Mohanraj, L. Karthick, R. Dhivagar
Summary: The experimental study on a heat pump water heater assisted regenerative solar still has shown promising results, with a cumulative productivity between 14.0 and 16.0 kg/day during 12 hours of operation. The system can deliver over 100 liters of hot water at 46.8-52.8 degrees C for domestic use, with a monthly average coefficient of performance estimated between 2.21 and 2.55.
APPLIED THERMAL ENGINEERING
(2021)
Article
Physics, Multidisciplinary
Primoz Poredos, Boris Vidrih, Alojz Poredos
Summary: This paper compared the exergy performance of different heat pump systems and a natural gas system for heating and cooling energy production in a single-house dwelling. Results showed that the HP water-water system with seasonal heat storage and a solar thermal collector had the highest efficiency compared to other systems.
Article
Green & Sustainable Science & Technology
R. Dhivagar, B. Deepanraj, M. Mohanraj, A. Prakash
Summary: This research assessed the thermal analysis of a heat pump assisted regenerative solar still (HPARSS) using slack wax heat storage material and compared it with a conventional solar still (CSS). The results showed that HPARSS had higher cumulative productivity, energy efficiency, and coefficient of performance compared to CSS. It can significantly reduce the demand for potable water.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
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.
Article
Thermodynamics
Zhihang Zheng, Jin Zhou, Ying Yang, Feng Xu, Hongcheng Liu, Yili Yan
Summary: The solar assisted ground source heat pump system (SAGSHP) is an efficient and clean renewable energy technology for hot water supply. However, the conventional SAGSHP system has poor solar energy utilization efficiency and suffers from decreased soil temperature, resulting in decreased system efficiency. To solve these problems, a SAGSHP system with graded thermal energy storage (SAGSHP-GTES) was proposed, which showed improved efficiency and eliminated the issue of soil temperature drop. The SAGSHP-GTES system demonstrated excellent performance in all climatic zones of China and is a feasible and efficient technology for hot water supply.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Green & Sustainable Science & Technology
Xin Jin, Huihui Zhang, Gongsheng Huang, Alvin CK. Lai
Summary: By comparing the effects of different operation modes, it was found that the dual-source solar-heat pump latent heat thermal energy storage system had an overall efficiency enhancement of about 57.5% under the combined heating mode. The coefficient of performance of the heat pump significantly increased from 2.09 to 2.60 when the flow rate increased, but increasing the flow rate did not significantly improve the overall efficiency of the entire heating system. The storage unit exhibits a high storage density of about 211.13 MJ/m(3) and a volume saving rate of 21%.
Article
Green & Sustainable Science & Technology
Tolga Ural, Gulsah Karaca Dolgun, Onur Vahip Guler, Ali Kecebas
Summary: This study focused on integrating solar air collectors into air source heat pumps to enhance performance in cold climate regions. By using textile based and flat plate solar air collectors, the research analyzed energy, exergy and economic aspects of these systems, showing improved COP values and exergy efficiency. Overall, the novel system (TSAHP) demonstrated lower levelized cost of heating compared to traditional ASHP.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2021)
Article
Thermodynamics
Evangelos Bellos, Christos Tzivanidis, Zafar Said
Summary: This work investigates a solar-assisted pumped thermal energy storage system which utilizes solar collectors, a heat pump, a storage system, and an organic Rankine cycle. By analyzing with a mathematical program, it was found that the optimum storage temperature is 150℃ and the optimum temperature in the evaporator of the heat pump is 75℃, resulting in a power recovery ratio of 68.48%, an organic Rankine cycle efficiency of 18.45%, and a heat pump coefficient of performance of 3.704.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Energy & Fuels
Yubo Wang, Zhenhua Quan, Yaohua Zhao, Lincheng Wang, Zichu Liu
Summary: A novel solar-air source heat pump system is proposed to efficiently and stably supply heat in the cold area of North China by using the latent heat of water in the ice tank as the main low-temperature heat source, complemented by solar energy and outdoor air. The system can also be used for cooling in summer, and combined with night energy storage to minimize building operation energy consumption and cost. The optimized system shows efficient operation under extreme weather conditions and a dynamic investment payback period of 3.86 years, presenting a promising way to meet building energy supply in cold areas.
Article
Chemistry, Multidisciplinary
Meng Li, Bowen Liu, Zhijian Liu, Yumeng Xiao, Hongmin Guo, Zehao An, Lidong Wang, Tony D. James
Summary: Solar steam generation is an efficient solution to address freshwater shortages. Researchers have developed a porous hydrogel material for metal ion adsorption, which can be used for solar steam generation at a high evaporation rate. Additionally, a heat management strategy involving a cold surface is proposed to enhance water evaporation.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Construction & Building Technology
Xuqiang Shao, Zhijian Liu, Siqi Zhang, Zijia Zhao, Chenxing Hu
Summary: This paper proposes a novel physics-informed graph neural network for rapid predicting urban wind field based on irregular unstructured mesh data of CFD simulation. The proposed model can predict wind fields of arbitrary large-scale urban scenes with significantly faster computation speed compared to traditional CFD models.
BUILDING AND ENVIRONMENT
(2023)
Article
Chemistry, Physical
Zhijian Liu, Jihao Wei, Guikai Zhang, Dewang Zhang, Jing Zhang, Weijie Yang, Chongchong Wu, Ian D. Gates
Summary: For human safety, efficient removal of formaldehyde in indoor environments is crucial. A metal-organic framework-based single-atom iron catalyst (Fe-SA) is proposed as a potential catalyst for formaldehyde oxidation. Through density functional theory (DFT) calculation, the adsorption characteristic and reaction path of Fe-SA with different coordination environments were explored. Fe-SA with 5-nitrogen coordination (Fe-SA-N-5-C) was selected and tested, showing a formaldehyde removal efficiency of 85.8% at 25 degrees C and 75% relative humidity, surpassing current data. Moisture was found to enhance catalytic oxidation of formaldehyde, indicating the practical applicability and stability of Fe-SA-N-5-C.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Construction & Building Technology
Zhijian Liu, Haiyang Liu, Mo Zhang, Junzhou He, Guoqing Cao
Summary: Surgical site infections (SSIs) lead to longer patient stays and higher hospital costs. Airborne microbe-carrying particles, mainly released from the surgical team, are a major cause of SSIs. Therefore, it is necessary to assess the amount of aerosol particles and microorganisms emitted by surgical staff. This study conducted experiments in a full-size operating room to evaluate four garment systems and nine movement combinations, presenting emission rates of particles and microorganisms as well as microbiome analysis by the surgical staff. Skin exposure areas and movement intensity significantly affect microbial and particle emissions. The findings contribute to the effective prevention of SSIs.
BUILDING AND ENVIRONMENT
(2023)
Article
Thermodynamics
Xiaoli Ma, Yufeng Zhang, Zhonghe Han, Ningbo Zang, Zhijian Liu
Summary: The paper presents a performance modelling of a thermoelectric air conditioning system that utilizes high power heat sinks to effectively remove waste heat and increase COPs. The system provides heating, cooling, and heat recovery ventilation, and the waste heat can be used for domestic drying services. The results showed that using high power heat sinks and an air mixture of room ventilation air and outdoor air can significantly improve the cooling and heating COPs.
Article
Public, Environmental & Occupational Health
Zhijian Liu, Peiwen Zhang, Haiyang Liu, Junzhou He, Yabin Li, Guangpeng Yao, Jia Liu, Meng Lv, Wenhui Yang
Summary: This study investigates the effectiveness of the oral spray suction machine (OSSM) in protecting healthcare providers from exposure to bioaerosols during dental treatment. The results show that the use of OSSM significantly reduces the concentration of bioaerosols, thereby minimizing the risk of transmission.
INTERNATIONAL JOURNAL OF HYGIENE AND ENVIRONMENTAL HEALTH
(2023)
Article
Engineering, Environmental
Zhijian Liu, Juntao Ma, Jiabin Lv, Yongxin Wang, Junzhou He, Guangpeng Yao, Guoqing Cao
Summary: In this study, experiments were conducted in a full-size negative-pressure operating room using Phi-X174 phage as a bioaerosol release source to investigate the migration and deposition of bioaerosols. The results showed that the high concentration of bioaerosols in the operating room was mainly concentrated in the vortex region below the medical lamp, and the surgical staff had high bioaerosol concentrations at their facial sampling points. This research can be used as a scientific reference for controlling bioaerosols and determining key disinfection parts in a negative-pressure operating room.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Meteorology & Atmospheric Sciences
Zhijian Liu, Hongwei Cao, Chenxing Hu, Minnan Wu, Siqi Zhang, Junzhou He, Chuan Jiang
Summary: The dispersion and deposition dynamics of bioaerosols around a vaccine factory were investigated under various thermal conditions and leakage rates. The improved Wells-Riley equation and Dijkstra's algorithm were used to assess infection risk and predict evacuation paths. The results show that bioaerosol deposition can reach 80 m on the windward sidewall of high-rise buildings, and the infection risk increases with unstable thermal stratification and higher leakage rates. This study provides a promising approach for infection risk assessment and evacuation planning in urban bioaerosol leakage emergencies.
NPJ CLIMATE AND ATMOSPHERIC SCIENCE
(2023)
Article
Engineering, Chemical
Zhijian Liu, Jiaqi Chu, Zhenzhe Huang, Haochuan Li, Xia Xiao, Junzhou He, Weijie Yang, Xuqiang Shao, Haiyang Liu
Summary: The new "physics-machine learning" (P-ML) method utilizes a lightweight, single-layer LSTM model to accurately calculate bioaerosol trajectories with some transferability. This method has significant potential for expediting trajectory calculation and prediction in enclosed environments.
AEROSOL SCIENCE AND TECHNOLOGY
(2023)
Article
Biophysics
Yongjun Jin, Zhijian Liu, Chenxing Hu, Zhijian Dong, Rui Rong, Haiyang Liu, Zhenyu Liang, Jingwei Liu, Li Chen, Minghua Huang, Haihang Cui, Yan Shen
Summary: The frequency characteristics of lung sounds are important for the noninvasive diagnosis of respiratory diseases. This study investigates the fluid flow characteristics and frequency characteristics of rales in the bronchi using a three-dimensional geometric model. The results show that bronchial blockage and sputum movement affect the turbulence and vortex shedding of the flow, resulting in changes in the dominant frequency and sound pressure level of the rales.
BIOMECHANICS AND MODELING IN MECHANOBIOLOGY
(2023)
Article
Thermodynamics
Yunhai Li, Yu Cui, Zhiying Song, Xudong Zhao, Jing Li, Chao Shen
Summary: Decarbonizing building heating is crucial for achieving carbon neutrality. Heat pumps have the potential to replace non-renewable heating devices, and a new dual-source heat pump system is proposed in this paper to overcome the challenges of conventional heat pumps. The study shows that the dual-source heat pump system has higher performance factors and lower defrosting costs compared to conventional systems, resulting in significant reductions in heating bills and carbon emissions. The investigation provides important guidance for the global application of the dual-source heat pump system and contributes to cost-saving, low-carbon heating, and sustainable development.
Article
Environmental Sciences
Xuqiang Shao, Zijia Zhao, Zhijian Liu, Haokang Yang, Chenxing Hu
Summary: In this study, the diffusion process of chlorine gas in a chemical laboratory and nearby urban areas in Beijing was numerically studied using the Weather Research and Forecasting Model (WRF) coupled with the open source OpenFOAM software platform. A dose-response model was used to assess chlorine lethality and exposure risk at the pedestrian level. An improved ant colony algorithm was applied to predict the evacuation path. The results demonstrated the combined effects of temperature, wind speed, and wind direction on the diffusion of toxic gases, providing valuable insights for exposure risk assessment and evacuation planning in the event of urban toxic gas leakage.
ENVIRONMENTAL POLLUTION
(2023)
Article
Engineering, Environmental
Zhijian Liu, Haochuan Li, Jiaqi Chu, Zhenzhe Huang, Xia Xiao, Yongxin Wang, Junzhou He
Summary: Airborne transmission is a common way of spreading infectious diseases, especially in closed environments. However, the impact of background particle concentration on bioaerosol characteristics has been overlooked in previous research. In this study, we compared the distributions of bioaerosols under heavily polluted and excellent background particle concentrations. The results showed a significant reduction in bioaerosol concentration and a higher decay rate under heavily polluted levels. The study also found differences in the size distribution of bioaerosols between the two levels of background particle concentration.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Green & Sustainable Science & Technology
Ali Badiei, Eric Jadowski, Saba Sadati, Arash Beizaee, Jing Li, Leila Khajenoori, Hamid Reza Nasriani, Guiqiang Li, Xin Xiao
Summary: This study explores the feasibility of using outside air for free cooling in modular data centres by implementing an air-side economiser. Through dynamic thermal modelling, it investigates the effectiveness of the air-side economiser in different climatic conditions. The results show significant energy reductions of up to 86% in moderate climates, while minimal reductions are observed in dry and hot climates. This research provides valuable insights into the practicality and energy-saving potential of air-side economisers in modular data centres across different climates.
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.
