Showing papers on "Gas compressor published in 2021"
TL;DR: In this article, the authors presented a different novel hybrid system by integrating two to three technologies for hydrogen purification combined in a way that enhances the strengths of each of them, which brought substantial synergy effect of one-another while improving the total hydrogen recovery, purity and total cost of hydrogen.
70 citations
TL;DR: In this article, a refrigerant-based thermal management system for electric vehicles (EVs) is proposed and analyzed, aiming to tackle the conflict between the cabin thermal comfort and the battery thermal safety, and realize the battery heating or cooling directly by the refrigerant without supplementary devices.
62 citations
TL;DR: In this paper, the effect of series, parallel and hybrid selective exhaust gas recirculation is examined, a concept where selectively CO2 can be recycled back and mixed into the ambient air to the inlet feed of the compressor thereby reducing the flue gas flow rate and enhancing CO2 content at the capture plant.
57 citations
TL;DR: In this paper, an improved irreversible closed modified simple Brayton cycle model with one isothermal heating process is established by using finite time thermodynamics, and the impacts of the irreversible losses on the optimization results are analyzed.
Abstract: An improved irreversible closed modified simple Brayton cycle model with one isothermal heating process is established in this paper by using finite time thermodynamics. The heat reservoirs are variable-temperature ones. The irreversible losses in the compressor, turbine, and heat exchangers are considered. Firstly, the cycle performance is optimized by taking four performance indicators, including the dimensionless power output, thermal efficiency, dimensionless power density, and dimensionless ecological function, as the optimization objectives. The impacts of the irreversible losses on the optimization results are analyzed. The results indicate that four objective functions increase as the compressor and turbine efficiencies increase. The influences of the latter efficiency on the cycle performances are more significant than those of the former efficiency. Then, the NSGA-II algorithm is applied for multi-objective optimization, and three different decision methods are used to select the optimal solution from the Pareto frontier. The results show that the dimensionless power density and dimensionless ecological function compromise dimensionless power output and thermal efficiency. The corresponding deviation index of the Shannon Entropy method is equal to the corresponding deviation index of the maximum ecological function.
45 citations
TL;DR: In this paper, a system that flexibly integrates the combined cycle power plant and liquid air energy storage to maximize the recovery of the wasted heat and cold energy is proposed, achieving the bidirectional peak shaving.
40 citations
TL;DR: In this paper, the energy, exergy, and economic analysis of a novel integrated power plant is investigated, where the heliostat solar receiver is integrated with many types of traditional power plants such as the gas turbine cycle, air-bottoming cycle, and absorption refrigeration system.
34 citations
TL;DR: In this paper, a novel biomass fueled externally fired gas turbine with closed cycle is introduced, and its exhaust heat is utilized for power generation via organic Rankine cycle or inlet cooling of gas compressor via an absorption cooling cycle.
34 citations
TL;DR: A novel performance diagnostic method that partitions the engine diagnosis into a series of steps to remove the “smearing effect” and reduce the matrix dimensions in the iterative diagnostic algorithm, which provides an accurate diagnosis with a reduced set of measurements.
33 citations
TL;DR: In this paper, the complete process from initial cycle design and fluid selection to the component selection and CAD work of the demonstrator is shown, and the simulated power-to-power efficiency reaches up to 59% for the design case.
31 citations
TL;DR: In this paper, a solar field with flat plate collectors, a high-temperature heat pump, a latent storage system and an organic Rankine cycle was investigated, and it was shown that providing heat input of a relatively high temperature in the heat pump of the pumped thermal energy storage system is an excellent choice for recovering higher amounts of electricity.
31 citations
TL;DR: In this paper, the authors proposed a novel design optimization method for the solar power tower (SPT) system with a supercritical CO2 (S-CO2) Brayton cycle.
TL;DR: This work proposes a normalized model for soft actuator pressure dynamics and quantifies the relationship between PSS parameters,soft actuator design parameters, and dynamic performance metrics of rise time, fall time, and actuation frequency, and introduces and demonstrates PSS parameter optimization.
Abstract: Soft actuators using pressurized air are being widely used due to their inherent compliance, conformability, and customizability. These actuators are powered and controlled by pneumatic supply systems (PSSs) consisting of components such as compressors, valves, tubing, and reservoirs. Regardless of the choice of actuator, the PSS critically affects overall performance of soft robots because it governs the soft actuator pressure dynamics, and thereby, the general dynamic behavior. While selecting and controlling PSS components for meeting desired soft actuator performance, specifications such as PSS mass, volume, and duration of operation must also be considered. Currently, there is no comprehensive study on PSS optimization for meeting dynamic performance and PSS specifications, due to limited understanding of soft actuator pressure dynamics, large solution space for PSSs, and variability in soft actuators. By considering critical parameters of PSS and soft actuators, we introduce and demonstrate PSS parameter optimization. We propose a normalized model for soft actuator pressure dynamics and quantify the relationship between PSS parameters, soft actuator design parameters, and dynamic performance metrics of rise time, fall time, and actuation frequency. After experimental validation, we applied these results and optimally select and control PSS components to meet desired soft actuator performance for a soft exosuit, while minimizing mass of selected components. The measured pressure response with this prototype agrees well with simulations, with root mean square errors <5.2%. This work is a step toward furthering the scope of soft robotics, as it enables PSS modeling and optimization, for meeting the desired soft actuator performance while also addressing PSS specifications.
TL;DR: In this paper, an innovative combined gas turbine-supercritical CO2 cycle is suggested for efficient power production using biogas generated from biomass anaerobic digestion to enhance the proposed system performance, its waste heat is recovered via absorption refrigeration for CO2 cooling at the compressor inlet of the S-CO2 cycle.
TL;DR: In this paper, the components design and performance analysis of a novel compressed carbon dioxide energy storage system is proposed, where the carbon dioxide compressor and all heat exchangers are designed by considering the real physical properties of carbon dioxide.
TL;DR: In this article, two typical sCO2 Brayton cycles including simple sCO 2 cycle (SSC) and recompression s CO2 cycle (RSC) are integrated with Kalina power cycles to provide a higher energy conversion efficiency for nuclear power plants.
TL;DR: In this article, a novel compound PV/T (photovoltaic thermal) waste heat driven ejector-heat pump system for simultaneous data center cooling and waste heat recovery for district heating networks is presented.
Abstract: This work presents an energy, exergy, and environmental evaluation of a novel compound PV/T (photovoltaic thermal) waste heat driven ejector-heat pump system for simultaneous data center cooling and waste heat recovery for district heating networks. The system uses PV/T waste heat with an evaporative-condenser as a driving force for an ejector while exploiting the generated electric power to operate the heat pump compressor and pumps. The vapor compression system assessed several environmentally friendly strategies. The study compares eleven lower global warming potential (GWP) refrigerants from different ASHRAE safety groups (R450A, R513A, R515A, R515B, R516A, R152a, R444A, R1234ze(E), R1234yf, R290, and R1243zf) with the hydrofluorocarbon (HFC) R134a. The results prove that the system presents a remarkable overall performance enhancement for all investigated refrigerants in both modes. Regarding the energy analysis, the cooling coefficient of performance (COPC) enhancement ranges from 15% to 54% compared with a traditional R134a heat pump. The most pronounced COPC enhancement is caused by R515B (a 54% COPC enhancement and 49% heating COP enhancement), followed by R515A and R1234ze(E). Concerning the exergy analysis, R515B shows the lowest exergy destruction, with the highest exergy efficiency than all investigated refrigerants.
TL;DR: In this paper, two S-CO2 cycle layouts are proposed to further develop energy systems with better economic performance and different modifications have been made to the cycles to decrease the exhaust temperature and recover the heat adequately.
TL;DR: In this paper, the authors proposed a combined GT/S-CO2/ORC/RO regenerative system for the simultaneous production of power and freshwater by the integration of a gas turbine (GT), a supercritical carbon dioxide cycle, an organic Rankine cycle (ORC), and a reverse osmosis (RO) desalination unit.
TL;DR: In this paper, a recompression sCO2 cycle is connected to a central-tower solar field with two-tank thermal storage delivering molten chloride salt at 670°C, which implies that the capacity of the thermal storage reduces by 25%.
TL;DR: The proposed algorithm with the optimized network structure is proved to be effective and reliable in predicting the pipeline operation status, under both the normal operation conditions and abnormal situations, and to be the first self-adaptive deep learning algorithm to assist natural gas pipeline intelligent control.
TL;DR: Reduced blade angles are demonstrated to compensate the adverse effect of positive blade thickness errors and thus enhance the impeller performance robustness against manufacturing uncertainties, and lays a theoretical foundation for the further uncertainty quantification and robust design of advanced centrifugal compressors.
TL;DR: In this article, a single-stage axial compressor is used to shed light on the dynamic stall phenomena via aero-acoustic measurements, where 8 acoustic pressure sensors are installed equally around the circumference of the compressor intake.
TL;DR: In this article, the performance of the supercritical carbon dioxide Brayton cycle was analyzed using a one-dimensional design and analysis model with two types of centrifugal compressors and a genetic algorithm.
TL;DR: In this article, the spatiotemporal coherent structure of compressor tip leakage flow was identified by spectral proper orthogonal decomposition (SPOD) on the near-tip flow field and the blade surface pressure of a low-speed compressor rotor.
Abstract: To identify the spatiotemporal coherent structure of compressor tip leakage flow, spectral proper orthogonal decomposition (SPOD) is performed on the near-tip flow field and the blade surface pressure of a low-speed compressor rotor. The data used for the SPOD analysis are obtained by delayed-detached eddy simulation, which is validated against the experimental data. The investigated rotor near-tip flow field is governed by two tip leakage vortices (TLV), and the near-tip compressor passage can be divided into four zones: the formation of main TLV (Zone I), the main TLV breakdown (Zone II), the formation of tip blockage cell (Zone III), and the formation of secondary TLV (Zone IV). Modal analysis from SPOD shows that a major part of total disturbance energy comes from the main TLV oscillating mode in Zone I and the main TLV vortex shedding mode in Zone III, both of which are low-frequency and low-rank; on the contrary, modal components in Zones II and IV are broadband and non-low-rank. Unsteady blade forces are mainly generated by the impingement of the main TLV on the blade pressure surface in Zone III, rather than the detachment of the secondary TLV from the blade suction surface in Zone IV. These identified coherent structures provide valuable knowledge for the aerodynamic/aeroelastic effects, turbulence modeling, and reduced-order modeling of compressor tip leakage flow.
TL;DR: In this article, a kind of foam metal casing treatment (FMCT) is proposed and experimentally tested on a low-speed axial flow compressor in this work, and it is found that the stall margin improvement (SMI) and the aerodynamic efficiency loss are functions of the axial location of the foam metal.
TL;DR: In this article, a small-scale Adiabatic Compressed Air Energy Storage (CAES) system with an artificial air vessel has been analyzed and different control strategies have been simulated and compared through a dynamic model in Simcenter AMESim®, by identifying the most appropriate ones to improve the performance in off-design conditions.
TL;DR: A method of modeling the windmilling operation of a TBCC engine and shows that this model could reflect the characteristics that the total pressure ratio of the compressor is below one, and it provides a positive torque instead of a negative one when the turbojet engine operates at some sub-idle states.
TL;DR: In this article, the use of an integrated gas-gas ejector system instead of a compressor is proposed and studied technically and economically in a typical oil refinery plant, with an investment cost of 4.84 $M and accepted payback period of 2 years and the recovery of approximately 90% flare gas volume during normal operation.
TL;DR: In this article, a stator-magnet transverse-flux linear oscillatory machine is proposed for direct compressor drive that can yield high reliability and is relatively simple to fabricate.
Abstract: In this article, a stator-magnet transverse-flux linear oscillatory machine is proposed for direct compressor drive. The robust transverse-flux structure with permanent magnets (PMs) embedded in the stator yoke and a moving-iron translator can yield high reliability and is relatively simple to fabricate. For electromagnetic performance analysis, a linear model under the no-load condition and a nonlinear model under the loaded condition are developed by taking into account the axial leakage flux and saturation effects of iron core, respectively. The effectiveness and accuracy of the proposed analytical models are verified by comparing the results with those of the finite-element analysis and the static experimental tests. Based on the measured static characteristics and damping coefficient, a system kinetic model is developed in the form of coupled equivalent electromechanical circuit, and validated by the results of dynamic test on a prototype. The key indices of the new machine are compared with those of an existing moving-magnet linear oscillatory machine, including the amount of PM usage, efficiency, and thrust density, etc. The case study results show that the proposed linear oscillatory machine is suitable for linear compressor drives.
TL;DR: In this paper, an experimental and numerical model-based approach for the estimation and control of the optimal heat rejection pressure in a one-stage transcritical CO2 heat pump equipped with an internal heat exchanger (IHX) and a liquid receiver is presented.