Article
Thermodynamics
Xuefeng Liu, Bin Huang, Yulan Zheng
Summary: This paper proposes a chiller dynamic optimization method based on Markov chain model predictive control algorithm, which studies the optimization of parallel operation characteristics of multiple chillers, corrects the occurrence of small probability events and avoids frequent chiller starts and stops. It reveals the prediction law of hourly load distribution of the future air conditioning system and explores the balance point between the prediction time of building load and the calculation time of chiller control strategy.
Article
Construction & Building Technology
Pei-Ling Liu, Bo-Sen Chuang, Wen-Shing Lee, Po-Liang Yeh
Summary: This study aims to optimize energy consumption in office buildings' HVAC systems, particularly focusing on chiller systems. By formulating a constrained optimization problem using chiller power consumption as the objective function, the study proposes an analytical solution for optimal chiller loading using the Gordon-Ng simplified model suggested by ASHRAE. The method demonstrated significant energy savings by determining the optimal chiller sequence and load distribution.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Computer Science, Artificial Intelligence
Jing An, Luyuan Xu, Zheng Fan, Kefan Wang, Qi Deng, Qi Kang
Summary: This study proposes an effective energy-saving control strategy for multiple chillers, which models energy consumption and constraints, and uses a two-layer control strategy with the PSO algorithm to optimize system energy consumption and achieve precise control.
INTERNATIONAL JOURNAL OF BIO-INSPIRED COMPUTATION
(2021)
Article
Thermodynamics
Arnas Lubis, Niccolo Giannetti, Muhammad I. Alhamid, Kiyoshi Saito, Hajime Yabase
Summary: This paper presents a numerical model for the dynamic analysis and control of a solar-assisted single-double-effect absorption chiller. The model is validated and used to develop an effective operating strategy for reducing energy consumption without compromising cooling output capacity.
APPLIED THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Bhavana Jangid, Parul Mathuria, Vikas Gupta
Summary: Active demand-side support for renewable energy integration is increasing, but managing numerous small capacity loads requires sophisticated methodologies. This paper proposes a three-step unified framework for aggregation, scheduling, and disaggregation that utilizes demand flexibility to reduce operational costs for the distribution system operator (DSO).
SUSTAINABLE ENERGY GRIDS & NETWORKS
(2023)
Article
Energy & Fuels
Hao Bai
Summary: This paper presents an analysis model for optimal operation efficiency of line in a distribution network, taking into consideration reliability and economy. The proposed model is tested in a distribution system.
Article
Thermodynamics
Jiaqi Yuan, Fu Xiao, Wenjie Gang, Ying Zhang, Junxiao Shi, Zhenying Zhang, Xiuxia Hao
Summary: This study proposes a new load allocation method for distributed energy systems, which adjusts the water flow rate or supply temperature of chilled/hot water systems based on the cooling production capability of absorption chillers. The results show that this method can improve energy utilization efficiency, cost savings, and reduce carbon emissions from the cooling systems.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Thermodynamics
Gabor L. Szabo
Summary: This article explores the optimization of absorption chillers by adjusting parameters to increase energy efficiency. Introducing new qualitative indicators can help better characterize absorption chillers, laying the foundation for future developments.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Green & Sustainable Science & Technology
Ali Sohani, Sahar Rezapour, Hoseyn Sayyaadi
Summary: This study employs multi-objective optimization to find the optimal design for Combined Cooling Heating and Power (CCHP) systems, revealing that tracking the optimal electrical demand ratio is the best strategy. Under the reference load ratio, the system shows significantly improved efficiency and emission reduction compared to the base case, with reduced costs and a payback period of 1.687 years.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Construction & Building Technology
Maryam Karami, Mohammad Jalalizadeh
Summary: This paper compares the thermoelectric performance of two BIPVT-based trigeneration systems using vapor compression and absorption chillers for supplying the cooling load of the building. The simulation results show that the system with an absorption chiller has a higher electrical solar fraction and a lower thermal solar fraction compared to the system with a vapor compression chiller. The economic analysis demonstrates that the payback time of the system with an absorption chiller is 4 years lower than that with a vapor compression chiller.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Thermodynamics
Marc Scherle, Julian Liedtke, Ulrich Nieken
Summary: The paper introduces a highly efficient adsorption chiller by optimizing the adsorbent layer thickness, process cycle time, and heat regeneration for maximum thermal efficiency. Through combined optimization, a Coefficient of Performance of up to 1.57 could be reached.
APPLIED THERMAL ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Khairulnadzmi Jamaluddin, Sharifah Rafidah Wan Alwi, Zainuddin Abd Manan, Khaidzir Hamzah, Jiri Jaromir Klemes, Roziah Zailan
Summary: This study focuses on a cascade analysis method for a nuclear trigeneration system, considering life cycle costing. The results show that the optimal configuration requires 1,102.25 MW of thermal energy and has an equivalent annual cost of 1.89 x 1011 USD.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Green & Sustainable Science & Technology
Ayse Fidan Altun
Summary: In this study, a novel trigeneration system combining a gas turbine prime mover, an ammonia-water refrigeration system, and a hot water generation system was investigated. The results showed that the system achieved higher energy efficiency and lower CO2 emissions compared to separate production.
Article
Construction & Building Technology
Lijie Wang, Jun Zhao, Zuhua Xu, Fei Zhao, Chunyue Song, Chao Yang, Zhijiang Shao
Summary: The use of heat storage capacity of a district heating network (DHN) can improve the volatility of the power grid, but solving the partial differential equations (PDEs) describing the thermodynamics and heat transfer behavior of DHN system leads to a high computational complexity problem. A data-driven model called Gaussian interpolated spatiotemporal Volterra model is proposed, which can fit the input-output characteristics of the DHN system without requiring the thermodynamic model and parameters of DHN. By adding heat storage capacity as new dispatch variables to the operation schedule of the integrated energy system, the optimization results demonstrate the superiority of wind power accommodation and effectively reduce the computational burden by avoiding the PDEs solving problem of DHN.
ENERGY AND BUILDINGS
(2023)
Article
Green & Sustainable Science & Technology
Zhijia Huang, Xiaofeng Chen, Kaiwen Wang, Binbin Zhou
Summary: This study focuses on a hotel's central air conditioning system and uses support vector regression to establish a load-forecasting model. By optimizing energy consumption, the system achieves energy savings.
Article
Thermodynamics
Dereje S. Ayou, Guillermo Zaragoza, Alberto Coronas
Summary: This study proposed a small-scale renewable heat powered polygeneration system based on solar and biomass energy, which can provide cooling, electricity, and desalinated water. Through experiments and analysis, the system demonstrated high resource utilization efficiency and energy conversion efficiency under abundant solar irradiation conditions.
APPLIED THERMAL ENGINEERING
(2021)
Article
Energy & Fuels
Juan Prieto, Antonio Atienza-Marquez, Alberto Coronas
Summary: This paper presents an experimentally validated, dynamic model of a hybrid liquid desiccant system and provides new experimental correlations. By conducting a sensitivity analysis to optimize the system performance, the liquid desiccant systems achieve an annual energy savings of 17% compared to conventional air-handling units.
Article
Thermodynamics
R. Rives, A. Mialdun, V. Yasnou, V. Shevtsova, A. Coronas
Summary: The experimental data on density and refractive index of binary mixtures of water and ionic liquid were studied at different temperatures, revealing a decrease in deviation with temperature. A simple linear mixing rule was found to be as effective as more advanced mixing rules for predicting the refractive index of the mixture.
JOURNAL OF CHEMICAL THERMODYNAMICS
(2021)
Article
Energy & Fuels
Dereje S. Ayou, Juan Prieto, Fahreza Ramadhan, Genaro Gonzalez, Juan Antonio Duro, Alberto Coronas
Summary: This study investigates the use of HVAC systems and non-HVAC control measures to reduce virus-laden bioaerosol exposure in highly occupied indoor spaces. The results show that a combination of ventilation, air filtration, and portable air cleaners can effectively reduce occupant exposure to bioaerosols.
Article
Thermodynamics
Antonio Atienza-Marquez, Joan Carles Bruno, Alberto Coronas
Summary: This study proposes a new system configuration to recover liquefied natural gas cold for sub-zero refrigeration in agro-food industries, aiming to increase efficiency and reduce refrigeration cost. The system is more competitive in warm climates and for large/medium plant sizes, but less so in cold locations and small-size plants.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Thermodynamics
Ronny Rives, Daniel Salavera, Juan Campos, Alberto Coronas
Summary: This study utilized Optical Digital Interferometry to visualize and model mass diffusion during the absorption process of ammonia in water. The method developed provided new spatio-temporal data on concentration profiles in the mixture and allowed for the determination of mass diffusivity and transfer coefficients. The results demonstrate the potential of this technique for designing components in absorption refrigeration systems.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2022)
Review
Green & Sustainable Science & Technology
Chong Zhai, Wei Wu, Alberto Coronas
Summary: Membrane-based absorption cycle technology offers excellent heat and mass transfer performance in small-scale applications, and is gaining increasing attention and development potential. Common membrane-based modules like plate-and-frame and hollow-fiber can improve heat transfer efficiency in absorbers, desorbers, and solution heat exchangers. Integrated components are proposed for further system size reduction, but challenges with cost and viscosity remain for ionic-liquid-based mixtures.
Article
Polymer Science
Paul Palmay, Cesar Puente, Diego Barzallo, Joan Carles Bruno
Summary: The study focused on determining the thermodynamic parameters of the degradation process of conventional thermoplastics through thermogravimetric analysis. The KAS model was found to be the best fit for the degradation process, and structures containing aromatic groups were shown to have lower energy, suggesting relative ease of degradation compared to linear structures.
Article
Chemistry, Multidisciplinary
Paul Palmay, Melissa Mora, Diego Barzallo, Joan Carles Bruno
Summary: This study determined the thermodynamic parameters of Polylactic Acid (PLA) under conditions of thermal degradation and found that as the heating rate increases, the degradation temperature also increases, while the activation energy, enthalpy and pre-exponential factor decrease. The results suggest that PLA has significant potential to be used as a raw material to produce bioenergy/biofuels.
APPLIED SCIENCES-BASEL
(2021)
Article
Biochemistry & Molecular Biology
Paul Palmay, Carla Haro, Ivan Huacho, Diego Barzallo, Joan Carles Bruno
Summary: The thermal pyrolysis of plastics is an important technique for managing non-degradable waste and promoting the circular economy. This study aimed to produce pyrolytic oil from thermoplastics and their mixtures, and analyze the performance and properties of the resulting products. The findings showed that a mixture of 75% polystyrene and 25% polypropylene had the highest pyrolysis yield and could be used as an additive agent for industrial fuels.
Article
Thermodynamics
Dereje S. Ayou, Reza Hargiyanto, Alberto Coronas
Summary: This study investigated the use of ammonia-based heat pumps for heating and cooling in the pasteurization of raw milk. Two different compression heat pump configurations were designed and compared, and the results showed that these heat pumps are more efficient and cost-effective than current heating and cooling systems used in the dairy processing industry.
APPLIED THERMAL ENGINEERING
(2022)
Article
Energy & Fuels
Paul Palmay, Cesar Puente, Carla Haro, Joan Carles Bruno, Alberto Coronas
Summary: This study aims to use the liquid fraction obtained from the pyrolysis of polystyrene as a fuel oil additive to improve its fluidity, without affecting its heating value. By mixing the obtained product with base fuel oil, a fuel with properties that meet industrial application standards can be obtained.
Article
Thermodynamics
G. Praveen Kumar, Dereje S. Ayou, C. Narendran, R. Saravanan, M. P. Maiya, Alberto Coronas
Summary: An advanced absorption cycle based on renewable source heat driven polygeneration is proposed for multiple products to rural communities. The cycle improves net power output by decreasing pumping power or increasing pressure ratio. Two absorbers in the cycle utilize rejected heat for fresh water production, drying, or domestic hot water applications. The study analyzes the effects of absorber temperature, generator temperature, condenser temperature, and refrigerant flow on the cooling and power sub cycle.
Article
Chemistry, Physical
David Latorre-Arca, M. Soledad Larrechi, Daniel Salavera, Alberto Coronas, Antonio Rodriguez-Fortea, Alejandro Rivera-Pousa, Trinidad Mendez-Morales, Luis M. Varela
Summary: In this study, the water association in water-lithium bromide-1,3-dimethylimidazolium chloride mixtures was quantitatively and structurally analyzed using multivariate curve resolution and molecular dynamics simulations. The results revealed the existence of three water chemical environments and showed that the amount of bulk water in ternary solutions is higher than in binary mixtures. Classical molecular dynamics simulations indicated that the water environment changes with increasing absorbent concentration, with enhanced interactions between ions.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Green & Sustainable Science & Technology
Juan Prieto, Dereje S. Ayou, Alberto Coronas
Summary: The aim of this study is to analyze the feasibility of the single-effect H2O/LiBr absorption heat pump cycle to produce combined heating and cooling. The main changes that the absorption cycle requires are described in comparison with the conventional single-effect absorption chiller. The energy and exergy performance of the cycle is theoretically studied for five different types of applications that require simultaneous heating and cooling.
CLEAN TECHNOLOGIES
(2023)
