@article{MTMT:34660474, title = {Assessment of industrial-scale green hydrogen production using renewable energy}, url = {https://m2.mtmt.hu/api/publication/34660474}, author = {Hassan, Qusay and Algburi, Sameer and Sameen, Aws Zuhair and Salman, Hayder M.}, doi = {10.1177/09576509231219339}, journal-iso = {P I MECH ENG A-J POW}, journal = {PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY}, unique-id = {34660474}, issn = {0957-6509}, keywords = {Renewable energy; SOLAR IRRADIANCE; green hydrogen production; wind energy optimization; electrolyser capacity}, year = {2023}, eissn = {2041-2967}, orcid-numbers = {Hassan, Qusay/0000-0001-9576-1918} } @article{MTMT:34371464, title = {An energy dispatch optimization for hybrid power ship system based on improved genetic algorithm}, url = {https://m2.mtmt.hu/api/publication/34371464}, author = {Wang, Xinyu and Zhu, Hongyu and Luo, Xiaoyuan and Chang, Shaoping and Guan, Xinping}, doi = {10.1177/09576509231205342}, journal-iso = {P I MECH ENG A-J POW}, journal = {PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY}, unique-id = {34371464}, issn = {0957-6509}, abstract = {Due to the energy crisis and environmental deterioration, the emerging hybrid energy ship power system gradually replaced the traditional ship power system to keep environmental friendliness by employing the clean energy. However, the increase of energy storage and photovoltaic generation system brings enormous challenge to the optimization scheduling of hybrid energy ship power system. For this reason, an improved genetic algorithm-based optimal scheduling strategy for the hybrid energy ship power system is developed in this paper. Firstly, a novel hybrid energy ship power system model including the diesel generator, energy storage system, propulsion system, dynamic load and photovoltaic power generation device is constructed under the constraint of energy efficiency and greenhouse gases emissions. Considering the various navigation situations that the ship may encounter, such as photovoltaic power generation limit in extreme weather and diesel generator power change in load shedding, the corresponding scheduling optimization problems for the hybrid energy ship power system are established. Under the cost and gas emission constraints, an improved genetic algorithm-based scheduling optimization algorithm is proposed. By introducing the nonlinear parameter change model in crossover and mutation operator, the performance of improved genetic algorithm can be enhanced, such as convergence speed and global optimization ability. Compared with current works, the proposed scheduling optimization strategy can achieve the lowest cost while reducing environmental impacts. Finally, simulation results under the given navigation cases demonstrate the superiority of the proposed improved genetic algorithm-based scheduling optimization strategy.}, keywords = {Carbon Dioxide; Emission reduction; improved genetic algorithm; Hybrid energy ship power system; energy scheduling optimization}, year = {2023}, eissn = {2041-2967} } @article{MTMT:34325304, title = {Thermal performance and economic sustainability of flat plate solar collectors using MgO and ZnO nanofluids: A comparative analysis}, url = {https://m2.mtmt.hu/api/publication/34325304}, author = {Choudhary, Suraj and Kumar, Vikash and Singhal, Varun}, doi = {10.1177/09576509231207154}, journal-iso = {P I MECH ENG A-J POW}, journal = {PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY}, unique-id = {34325304}, issn = {0957-6509}, abstract = {Considering the higher outlet temperature, the present study assessed the performance of Zinc oxide (ZnO) and Magnesium oxide (MgO) nanofluid-based flat plate solar collector at a low volumetric flow rate, that is, 30 L/h. The lower solar irradiance results in a low percentage enhancement in collector efficiency; therefore, it constraints the use of the nanofluid-based collector at such conditions. The collector efficiency was nearly 67.98% and 65.22% for 1 vol% ZnO and 0.2 vol% MgO, respectively, almost 20.57% and 16.53% more than base fluid (ethylene glycol: distilled water). For 1 vol% ZnO and 0.2 vol% MgO, the heat absorption parameter intensified by 20.48% and 17.12%, respectively. The payback period at the optimum concentrations of ZnO and MgO nanofluid-based flat plate solar collector compared to electric heating was similar to 2.97 and 3.69 years, respectively. In terms of present worth, the cost savings in a life span of 15 years was approximately 1918.18 and 1839.05 USD for 1 vol% ZnO and 0.2 vol% MgO, respectively. Such gains could be extended using large-sized areas of collectors. The 1 vol% ZnO at the flow rate of 30 L/h has the shortest payback period and highest cost-saving; hence, profoundly recommended in the flat plate solar collector instead of the base fluid.}, keywords = {economic analysis; Thermal performance; Nanofluid; flat plate solar collector}, year = {2023}, eissn = {2041-2967} } @article{MTMT:33949845, title = {A review of nucleate pool-boiling heat transfer in different liquids and nanofluids}, url = {https://m2.mtmt.hu/api/publication/33949845}, author = {Zarrag, Khudir Z. and Ismail, Firas B. and Sann, Tan E. and Habeeb, Laith J.}, doi = {10.1177/09576509231174692}, journal-iso = {P I MECH ENG A-J POW}, journal = {PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY}, unique-id = {33949845}, issn = {0957-6509}, abstract = {The goal of this review is to examine the current state of the art in nucleate pool boiling heat transfer in a variety of different fluids. The review is divided into many sections that discuss heat transfer in pool boiling, such as pool boiling of nanofluids, boiling behavior of water-glycerin combinations, and operational parameters. With the appropriate mixes of hydrocarbons and other commercial liquids, higher heat transfer coefficients may be produced. Coatings of nanoparticles with varying layer thicknesses applied to the heater surface may be optimized to improve heat transfer from the pool to the surrounding water. The heat transfer hypothesis elucidates the peculiarities of each pool's boiling regime. It is also possible to expand it to flow boiling by combining pool boiling liquid motion with external mechanical force. Other phase transitions, such as condensation, solidification, and melting, can also be described using boiling heat flow processes. Pool boiling performance can be improved by making a variety of adjustments to the heating surfaces as well as by using pure liquids in the water. Improvements can be made to boiling parameters such as the heat flux, the critical heat flux, the heat transfer coefficient, bubble development and departure, and so forth. A nanoparticle addition to a pure liquid or a surface coating on a heating surface can improve heat transfer and boiling properties by increasing the surface area of the liquid. Pool boiling critical heat flux was enhanced with Al2O3-water nano fluid. Authors used three different powder sizes of Al2O3 which were 0.05, 0.3 and 1.0 mu m. Addition of alumina particle in water increases the boiling heat flux. Critical heat flux (CHF) was significantly enhanced using Titania and Alumina nano particles in water as compared to pure water. Average size of nano particle used was 85 nm measured by scattering electron microscope. Enhancement in Critical heat flux is due to nano particle coating on heating surface. Characteristics of nucleate boiling are greatly affected by the operating pressure. Miniature flat heat pipe (MFHP) with evaporator having micro grooved heat transfer surface gives 50% increment in critical heat flux at atmosphere pressure whereas this value increases up to 150% at 7.4 kPa pressure. The addition of CNT (carbon nanotube) to the base liquid increases the critical heat flux. Transmission electron microscopy confirms the average size of a nanoparticle as 15 nm. Authors found that by decreasing pressure from atmosphere condition critical heat flux increases to 200% with CNT/water nano fluid as compared to deionized water. SiC-water nanofluids of 100 nm size were experimented with at volume concentrations of 0.001%, 0.001%, and 0.01%. The size of the nanoparticle was confirmed by a scattering electron microscope. Authors concluded that at 0.01% of nano particle enhances critical heat flux to 105%.}, keywords = {Pool boiling; Nucleate boiling; liquid heating; correlations of pool boiling}, year = {2023}, eissn = {2041-2967} } @article{MTMT:33892236, title = {The effects of the return channel geometry on the aerodynamic performance of a centrifugal compressor: A numerical study}, url = {https://m2.mtmt.hu/api/publication/33892236}, author = {Safari, M. R. and Anbarsooz, M. and Niazmand, H.}, doi = {10.1177/09576509231157229}, journal-iso = {P I MECH ENG A-J POW}, journal = {PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY}, unique-id = {33892236}, issn = {0957-6509}, abstract = {In this paper, steady RANS (Reynolds-Averaged Navier-Stokes) numerical modeling of the return system of a centrifugal compressor is carried out to investigate the effects of various geometrical parameters on the aerodynamic performance of the return system. The effects of using splitter vanes in the return-channel, the width ratio of the return channel and the diverging angle of the walls are examined. Numerical results revealed that using splitter vanes can enhance the stage averaged pressure ratio and polytropic efficiency by 0.74 and 3.21%, respectively. Results showed that increasing the width ratio can enhance the efficiency and pressure ratio near the choke region, however, it has marginal effects on the performance at low flow coefficients. Results also showed that, due to the negligible effects of the diverging angle on the stage performance, using diverging hub wall can reduce the total axial length of the multistage compressor. Finally, a new return system is designed based on the combination of the best geometrical parameters found in the current study. Simulation results demonstrated that the average pressure ratio and efficiency of the compressor have been improved by 0.99% and 4%, respectively, by the newly developed return system compared to the original design.}, keywords = {CFD; Centrifugal compressor; Return system; vaned return channel; splitter vanes}, year = {2023}, eissn = {2041-2967} } @article{MTMT:34067009, title = {Parametric optimization of hybrid artificial roughness used in solar air heaters using multiple criteria decision making techniques}, url = {https://m2.mtmt.hu/api/publication/34067009}, author = {Goel, Varun and Dwivedi, Ankur and Choudhary, Akhilesh Kumar}, doi = {10.1177/09576509231183037}, journal-iso = {P I MECH ENG A-J POW}, journal = {PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY}, volume = {&}, unique-id = {34067009}, issn = {0957-6509}, abstract = {Solar air heaters (SAHs) are widely accepted and used for drying and heating purposes. Numerous methodologies are available for augmentation of the performance of a SAH but the application of artificial roughness underside the absorber plate is reported to bean efficient one. This study aims to present the effects of using hybrid artificial roughness combining the transverse ribs along with discrete inclined ribs, on the thermo-hydraulic performance of roughened SAH. The response surface methodology (RSM) is utilized for the design of experiments to investigate the influence of relative roughness height (0.018 ≤ e/ D ≤ 0.036), relative roughness pitch (5 ≤ p/ e ≤ 15), attack angle (45° ≤ α ≤ 75°), and Reynolds number (1,900 ≤ Re ≤ 20,300) as input parameters. The empirical equations are developed for Nusselt number, friction factor, and thermo-hydraulic performance parameter based on the regression analysis. An integrated analytical hierarchy process-based weighted aggregated sum product assessment (AHP-WASPAS) method is used to evaluate an optimal parametric combination ( e/ D = 0.036, p/ e = 15, α = 75°, and Re = 20,300). The results are supported by the corresponding experimental outcomes. Also, the sensitivity analysis and rank reversal tests performed as qualitative assessment procedures for the results obtained from the proposed strategy. The proposed decision framework is reported to be very sensitive to several criteria weight fluctuations with maximum and least deviations of 15.41% and 2.56% for δW jp = +50% and δW jp = −10%, respectively. Further, the obtained results confirm the robustness of aopted decisional scheme with just one rank reversal.}, year = {2023}, eissn = {2041-2967}, pages = {1}, orcid-numbers = {Dwivedi, Ankur/0000-0003-1629-4026; Choudhary, Akhilesh Kumar/0000-0003-2448-0929} } @article{MTMT:33411883, title = {Profile vortex shedding from low-speed axial fan rotor blades: A modelling overview (vol 236, pg 349, 2022)}, url = {https://m2.mtmt.hu/api/publication/33411883}, author = {Daku, G. and Vad, J.}, doi = {10.1177/09576509221105353}, journal-iso = {P I MECH ENG A-J POW}, journal = {PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY}, unique-id = {33411883}, issn = {0957-6509}, year = {2022}, eissn = {2041-2967} } @article{MTMT:33283863, title = {Experimental investigation into the effect of main stage swirl on flow and spray characteristics inside a stratified partially premixed combustor}, url = {https://m2.mtmt.hu/api/publication/33283863}, author = {Zhao, Qianpeng and Gao, Yaping and Liu, Cunxi and Mu, Yong and Xu, Gang and Zhu, Junqiang}, doi = {10.1177/09576509221142398}, journal-iso = {P I MECH ENG A-J POW}, journal = {PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY}, unique-id = {33283863}, issn = {0957-6509}, abstract = {Lean combustion has been applied in gas turbine combustors to meet increasingly stringent regulations for pollutant emissions. As a representative low-emission technology, stratified partially premixed (SPP) combustion is capable of effectively reducing NOx emissions while still providing robust flames. In this work, the flow and spray processes inside an SPP combustor were experimentally investigated to further reveal the role of main stage swirl in flow development and fuel placement. Particle image velocimetry (PIV) and Planar Mie scattering (PMie) techniques were applied to provide the velocity distributions and droplet distributions under isothermal conditions with a relative pressure drop ranging from 1% to 5%. A spray post-processing algorithm was developed to acquire the characteristic parameters of the sprays without clear boundaries. Results show that the strong swirl from the main stage leads to the radial flow of pilot air streams and dominates the formation of central toroidal recirculation zone (CTRZ). With the addition of the main stage swirl, a proper flow structure including jet zones, recirculation zones and shear layers is formed, which promotes the widening of droplet radial distribution and the increase of the spray cone angle. The spray distribution therefore transforms from a bubble shape into a cone shape. The findings and conclusions could promote the understanding of interactions between pilot and main stage swirls for stage combustors and contribute to the optimization of such SPP injectors.}, year = {2022}, eissn = {2041-2967}, pages = {095765092211423}, orcid-numbers = {Zhao, Qianpeng/0000-0002-8537-8058} } @article{MTMT:33206959, title = {Investigation of suction pressure pulsation prediction of rotary compressor with total variation diminishing scheme and one-dimensional accumulator model}, url = {https://m2.mtmt.hu/api/publication/33206959}, author = {Wu, Jianhua and Li, Jiachen and Zhang, Shuai}, doi = {10.1177/09576509221116492}, journal-iso = {P I MECH ENG A-J POW}, journal = {PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY}, volume = {0(0) online first, First published online August 25, 2022}, unique-id = {33206959}, issn = {0957-6509}, abstract = {The suction pressure pulsation plays a significant role in rotary compressor performance, so employing gas dynamic model for simulation is critical for compressor performance prediction and structure design. Comparing with the conventional Lax-wendroff two-step (LW2) scheme which has been usually utilized with good behaviors of speed and stability, this paper adopted the total variation diminishing scheme with higher convergence speed and less dispersion. And the common zero-dimensional model for the accumulator is updated to a one-dimensional model achieving more accurate pressure results at the suction pipe inlet. The simulation results of instantaneous pressure are also compared with experimental measured data under different conditions. The Pearson Correlation Coefficient of simulated pressure curves are all higher than 0.9 and the relative errors of predicted performance are almost all less than 5%, which indicates better agreement on pressure pulsation simulation and performance prediction.}, year = {2022}, eissn = {2041-2967}, pages = {095765092211164}, orcid-numbers = {Li, Jiachen/0000-0003-1948-2479; Zhang, Shuai/0000-0002-7665-7717} } @article{MTMT:33003672, title = {Effect of split injection strategies on diverse characteristics of a common rail direct injection diesel engine operating with diesel-palm oil-ethanol micro-emulsions}, url = {https://m2.mtmt.hu/api/publication/33003672}, author = {Qi, Donghui and Li, Kai and Zhang, Chenxi and Wang, Tao}, doi = {10.1177/09576509221077545}, journal-iso = {P I MECH ENG A-J POW}, journal = {PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY}, unique-id = {33003672}, issn = {0957-6509}, abstract = {This study investigated the effect of pilot injection timing (PIT) and pilot injection quantity (PIQ) on the performance of a common rail direct injection (CRDI) diesel engine with two-stage injection system operating with diesel-palm oil-ethanol micro-emulsions. The results indicated that, at low engine load, the maximum in-cylinder pressure (P-max) and peak of heat release rate (HRR) of D35P35E30 were highest, and those of D100 were lowest. At high engine load, the P-max of D100 was highest, that of D60P30E10 was lowest, and the peaks of HRR were almost identical for all test fuels. The P-max and peak of HRR were slightly increased with the advance of PIT. Increasing PIQ increased the first peak of HRR and reduced the second one. At low engine load, the coefficient of variation (COV) of P-max and the indicated mean effective pressure (IMEP) presented a slight decrease for the micro-emulsions, but did for D100 at high engine loads. The brake specific fuel consumption (BSFC) of the micro-emulsions was higher, and the brake thermal efficiency (BTE) was also slightly higher when compared with diesel (D100). With the advance of PIT and the increase of PIQ, BSFC was increased, BTE was decreased, and hydrocarbon (HC) emissions were reduced. The variation of PIT and PIQ had little effect on the particle number concentration (PNC), but had evident effect on nitrogen oxides (NOx) emissions. It was concluded that the micro-emulsions can be used to reduce NOx and particulate matter (PM) combined with injection strategy in a diesel engine.}, keywords = {COMBUSTION; EMISSIONS; Diesel engine; micro-emulsion; Injection strategy}, year = {2022}, eissn = {2041-2967}, orcid-numbers = {Qi, Donghui/0000-0001-5026-0941} }