Rotary Wheel Research Articles

Unveiling the water sorption kinetics, thermodynamics, and air dehumidification performance of sustainably synthesized metal–organic frameworks

This study focuses on the feasibility of sustainably synthesized MIL-100(Fe) as an alternative to conventional desiccants, such as silica gel and zeolites, which have low adsorption capacity and poor thermal characteristics for air dehumidification. MIL-100(Fe), a metal–organic framework, shows promise due to its excellent adsorption and customizable thermal properties. However, its synthesis typically involves toxic materials and high temperature/pressure conditions, which restrict its bulk production for large-scale applications. This study aims to explore sustainable synthesis methods for MIL-100(Fe) using non-toxic materials and milder reaction conditions and investigate its material characteristics and dehumidification performance. Experimental analyses are carried out to measure adsorption isotherms, kinetics, sorption heat, activation energy, and cyclic stability, and numerical simulations are conducted in COMSOL Multiphysics platform to estimate dehumidification performance. The test results demonstrate that MIL-100(Fe) has a higher water adsorption capacity compared to silica gel, with a unique stepwise adsorption into its two types of mesoporous cages. Increased temperatures cause the adsorption and desorption isotherms to shift towards higher relative humidity levels. The heat of water adsorption and desorption ranges between 2630–2906 kJ/kg and 2763–2848 kJ/kg, respectively. MIL-100(Fe) demonstrates high stability and no significant loss in water uptake capacity. The simulated performance indicate that MIL–100(Fe) has superior reaction rates and is 82 % more effective than the silica gel rotary wheel dehumidifiers.

Investigation of the energetic and exergetic performance of hybrid rotary desiccant-vapor compression cooling systems using different refrigerants

In this study, a desiccant-based hybrid cooling system supported by a vapor compression system and a heat recovery unit (rotary heat wheel) was analyzed from energetic and exergetic perspectives during the daily working hours of an office building in Istanbul to meet the desired comfort conditions. We focus on the impact of different refrigerants; namely R32, R1234yf, R290, R134a, R600a, R245fa, and R717, on hybrid rotary desiccant-vapor compression systems. While the highest electricity consumption was obtained in the system using R1234yf, the lowest electricity consumption was achieved with R717. However, with the effectiveness of the desiccant wheel, the best results were obtained for R1234yf with those pertinent to R717 at the other extreme. Considering the total electricity consumption of the system, the highest energetic and exergetic performance parameters were achieved with the use of R717 as the refrigerant. Compared to R1234yf, the daily average energetic performance parameters obtained with R717 increased by 22.3 % for COPr, 21.8 % for COPel, and 4.7 % for COPth. Similarly, compared to R1234yf, the daily average exergetic performance parameters in R717 presented increases of 13.6 % for COPx,el, 7.5 % for COPx,th, and 8.1 % for ηx.

Drying Characteristics of Moutan Cortex by Rotary Wheel Microwave Vacuum Drying and Its Influence on Quality

To enhance the quality of Moutan Cortex for medicinal purposes, this study was conducted to analyze the impact of rotary microwave vacuum drying on its drying characteristics and overall quality. Experimental variables including drying temperature, rotor speed, and vacuum were examined to evaluate their effects on the microstructure, effective components, and drying properties of Moutan Cortex. The back propagation (BP) neural network was optimized by the northern eagle algorithm (NGO) to predict the moisture ratio throughout the drying process. Results indicated that increasing the drying temperature, vacuum level, and rotation speed led to an acceleration in the drying rate of Moutan Cortex, thereby reducing the drying time. The quality and color of dried products after microwave vacuum drying were superior to those achieved through natural drying. Notably, at the drying temperature of 50 °C, the Moutan Cortex demonstrated the highest total phenol content (451.33 mg/g) and antioxidant capacity (78.95%). With an increase in drying temperature, vacuum, and rotational speed, the polysaccharide showed an upward trend, and the highest value (681.37 mg/g) was obtained at 50 Hz. The highest total flavonoid content (1.08 mg/g) was observed at vacuum of −70 kPa. Optimal conditions for preserving the internal organization and maximizing the contents of gallic acid, paeoni-florin, benzoylpaeoniflorin, and paeonol were identified at a drying temperature of 45 °C, vacuum level of −65 kPa, and rotation rate of 35 Hz. Overall, the study concluded that the microwave vacuum drying of Moutan Cortex can significantly improve its medicinal value, offering valuable insights for the industrial processing of Moutan Cortex.

Rotary Heat Recovery Wheel (RHRW) system with an embedded PCM: Proof of concept

This work presents the thermal performance of a novel Rotary Heat Recovery Wheel (RHRW) system incorporating a Phase Change Material (PCM) embedded in the solid structure of the matrix of a rotating recuperator. The main aim of this device is to increase the thermal efficiency of the RHRW in two ways: by storing large amounts of thermal energy in latent form, and by permitting approach temperatures (around PCM melting point) that are closer to the desired setpoint temperatures for heating/cooling purposesA numerical model of the RHRW system with an embedded PCM was developed, comparing its performance against an identical RHRW without the PCM. The numerical model was validated with experimental data from the literature. A sensitivity analysis was carried out, varying the content of PCM embedded and the rotating speed of the wheel. Under the conditions tested in this work, for intermediate rotating speeds (between 0.1 and 0.7rpm) the PCM increases the efficiency of the system. For n=0.3rpm the efficiency augments from 0.44 to 0.87 with an addition of 15% in mass of PCM. There is also a certain rotating speed, nmax, for which the efficiency is maximum as the phase change of the PCM limits the temperature change. A relationship is proposed between the rotating speed and the mass fraction of PCM to reach the maximum efficiency.

An Approach to Combine House of Quality and Finite Element Method in Redesigning of Rotary Shaft Multi-Spindle Wheel Nutrunner Machine

An Approach to Combine House of Quality and Finite Element Method in Redesigning of Rotary Shaft Multi-Spindle Wheel Nutrunner Machine

Development of rotary dehumidifier with silica-gel-based composite desiccant

The desiccant dehumidification system's key component, the desiccant wheel, can perform effectively using composite desiccant materials. Evaluation of the desiccant wheel's performance using composite desiccant material is the primary goal of this study. Authors have compared the performance of two desiccant wheels; one is packed with traditional Silica-gel, and the other is a composite of Silica-gel and calcium chloride in a ratio of 3:2 by weight. A rotary wheel is developed with rectangular channels parallel to the wheel's axis. The novelty of this research lies in the improved design of the desiccant wheel. Unlike other techniques involving pressure losses and ineffective space utilization, this design offers better space utilization and fewer pressure losses. In addition, wheel fabrication is less costly and easily reusable with other desiccants. Three performance indicators were evaluated through experimentation: dehumidification capability, moisture removal capacity, and dehumidification coefficient of performance. Results show that the Parallel channel desiccant wheel achieves 25% higher dehumidification capability and 55% greater moisture removal capacity. The specific humidity of the air is reduced by 35% using the composite desiccant wheel. Comparing the composite desiccant to traditional Silica-gel, its dehumidification coefficient of performance is 40% higher.

Development Of Mathematics Spin Wheel Learning Media Flat Building Materials for Elementary Students

This study aims to develop mathematics learning on flat shapes using a rotating wheel in elementary school students. Research method that is used is Research and Development (RD) of the ADDIE development model. This research was conducted in one of elementary school in South Jakarta, this research and development showed the results: 1) The development of a flat shape math wheel media was made based on the needs and characteristics of elementary school students. The design of the mathematics spin wheel learning media that the researchers made is very interesting because it develops innovations including 3D image shapes and various color choices, 2) The validity of the research and development of the math spin wheel media flat shape material has been validated by several expert whose results in average score is 90% with very valid criteria. 3) The level of effectiveness in the research and development of the mathematical rotary wheel media on flat shape materials was tested on a limited pilot trial and extensive trial. In limited pilot trial the researcher got an N-Gain value of 0.4 from the results of 6 students. Furthermore, in extensive trial, the researcher calculated the effectiveness by measuring the comparison of the pre-test and post-test and then calculated using the N-Gain formula and scored 0.82 and was included in the category of high effectiveness (effective). the results and conclusions of this research is flat shape math wheel media could be implemented in elementary school.

Pengaruh Penggunaan Media Roda Putar terhadap Hasil Belajar IPA Siswa Kelas V SDN Banyubiru 01

The background to this research is that the low science learning outcomes of class V students at SDN Banyubiru 01 are due to the teacher still using the lecture method so that students only compete with the teacher and students feel bored in the learning process. By using a rotary wheel media, students will have a high curiosity in the learning process. This study uses quantitative research. The data collection technique used is in the form of a test. The results of the study show that there is an effect of the use of rotary wheel media on science learning outcomes. This can be proven by the acquisition of hypotensive test results with the t test formula, namely with the calculated t value greater than t table (5.10504> 2.042) then Ha is accepted and Ho is rejected.Keywords: rotating wheel media, science learning outcomes.

Performance evaluation of a rotary dehumidifier with molecular sieve desiccant using coupled regeneration mode: Experimental investigation

The increasing demand for energy-efficient and environmentally friendly air conditioning systems has led to the development of innovative technologies such as desiccant cooling systems. This study presents a comprehensive experimental analysis of the dehumidification and thermal performance of a rotary dehumidifier with molecular sieve desiccant designed to effectively remove moisture from the air by utilizing coupled regeneration mode (complete waste heat liberated out of condenser and electric rod heat). Various experiments were conducted to investigate different performance parameters including moisture removed from air by adsorption, moisture added to air by regeneration, dehumidification effectiveness, regeneration effectiveness, moisture removal capacity (MRC), regeneration rate (RR) at different process air inlet temperatures ranging (28–34 °C) and at different regeneration air inlet temperatures ranging (55–62 °C). These experiments were conducted at same air velocity for both adsorption and regeneration segments of rotary solid desiccant wheel using molecular sieve. The results showed that the performance of the desiccant wheel was affected by inlet temperature and humidity ratio for adsorption and regeneration segments. The findings emphasize the system's ability to provide efficient dehumidification and cooling while simultaneously promoting sustainable energy practices. Moreover, the waste heat recovery system significantly contributes to the overall efficiency improvement of the rotary dehumidifier with molecular sieve desiccant, making it an environmentally friendly alternative to conventional air conditioning technologies.

Development directions of wrist (finger) praxis of preschoolers with speech disorders

The article describes the development problem of wrist (finger) praxis of senior preschool children with speech disorders. Apraxia is a kind of movement disorder where paralysis is not observed. It is accepted to distinguish three main types of apraxia: motor, visual-spatial and kinaesthetic. The neurophysiological connection between the motility of the wrist and the motility of the articulating apparatus (tongue, lips, lower jaw) has been clarified. Violation or underdevelopment of wrist praxis of junior and preschool age children can negatively affect the child's speech: both oral and written. The most effective directions for the formation of wrist praxis of pre-schoolers with speech development disorders have been singled out. The first direction concerns the physical development of children in the direction of the subject-manipulative activity (M. Yefymenko). The main directions of the wrist praxis development include: physical development of children; subject-centred and manipulative activities; subject-centred and practical activities; labour activity, artistic-aesthetic activity and modelling-constructing. The second direction concerns the use of significant opportunities of children's labour activity, in particular their instrumental manual actions with the use of carpentry and metalwork tools (V. Kantarzhy). Instrumental activities were classified as follows: 1) carpentry work exercises with a carpentry vice, with mallets, with files, on a grinding wheel, with saws, with a drill, with a rotary wheel, with keys, with screwdrivers, with the assembly of structures with the help of keys and/or a screwdriver; 2) locksmith work exercises with hammers, with locksmith vices, with files, with hacksaws, etc. With the optimal combination of these main directions, we see prospects for increasing the effectiveness of the wrist praxis development of pre-schoolers with speech development disorders.

PENERAPAN MEDIA RODA PUTAR PADA MATERI HAK DAN KEWAJIBAN DI JALAN RAYA DI SDN KARANGREJO 01

This study aims to determine the application of rotary wheel media to the learning outcomes of class III students at SDN Karangrejo 01 Semarang on the material rights and obligations on the highway. This research uses quantitative methods. The data collection technique in this study was by giving pre-test and post-test questions to class III students. The sample of this research was class III students at SDN Karangrejo 01, totaling 26 students consisting of 10 female students and 16 male students. The results of student learning completeness at the time before the application of the rotary wheel media were 15 students with an average class value of 65.38 then after the application of the rotary wheel media on the material rights and obligations on the highway there was an increase of 7 students with an average class value of 81, 54.

THE USE OF SPINNING-WHEEL MEDIA TO IMPROVE THE STUDENTS’ TAJWID COMPREHENSION

Abstract
 The background of this research is that the learning media used by teachers affect students' understanding of tajwid when reading Qur'an. Simple media that can solve this problem is a rotating wheel media containing hijaiyah letters. The purpose of this study was to determine students' understanding of tajwid by using a rotary wheel in the Al-Qur'an Hadith Subject. The research method used was quantitative with quasi-experimental research and Time-Series Design. The sampling technique used purposive sampling. Data collection was done using tests and assessment rubrics. Data were analyzed using descriptive statistical techniques and t-test. The results of this study indicated that in the cognitive and skill domains, the average value of the pretest and posttest were in a good category and improved after being treated with a rotating wheel media. The t-test results showed the sig. (2-tailed) was 0.000 < 0.05. Therefore, applying the rotary wheel media increased students' comprehension of tajwid.

HASIL BELAJAR PENDIDIKAN PANCASILA MENGGUNAKAN MODEL PEMBELAJARAN STAD BERBANTUAN MEDIA RODA PUTAR PADA SISWA KELAS IV.

The lack of innovation in learning activities in Pancasila education subjects is due to the lecture method used in the learning process. So that learning seems boring and less interesting for students. This study aims to determine the learning outcomes of Pancasila education after being given learning with the STAD learning model assisted by rotary wheel media. This type of research is a quantitative study using a quasi-experimental research method with a Nonequavalent Pre-Test Posttest Control Group design. In the independent t-test test output table the significance value (2-tailed) in the control class is 0.000 and in the experimental class is 0.025 this shows that there is an average difference in pretest and posttest values ​​between the control class and the experimental class because 0.000 and 0.025 <0.05. So that it can be concluded that after being given the treatment of Pancasila education learning outcomes between the control class and experimental class there is a difference.Keywords: STAD Learning Model, Spin Wheel, Learning Outcomes.

HASIL BELAJAR IPAS MENGGUNAKAN MODEL PEMBELAJARAN TGT BERBANTUAN MEDIA RODA PUTAR PADA SISWA KELAS IV SD N PATI WETAN 03


 Class IV teacher learning activities at SD N Pati Wetan 03 are still using the teacher center learning method, which means teacher-centered learning. At the time of learning the lack of teachers in applying learning models and media as a support for achieving learning objectives. In accordance with these problems, the researcher was interested in examining whether there was an influence by applying the TGT learning model assisted by the rotary wheel media on the learning outcomes of class IV Science at SD N Pati Wetan 03. This research was a quantitative study using the one group pretest-posttest experimental method. The instrument used is a test instrument that aims to measure student learning outcomes with 10 multiple choice questions and 5 essay questions. The analysis technique used is the normality test and paired sample t-test. Based on the results of the normality test analysis, namely the pretest sig. 0.144 > 0.05 and posttest sig. 0.62 > 0.05, it can be seen that the data is normally distributed. In the paired sample t-test there is an analysis result with t count > t table (30.089 > 1.71714) and at significance that is 0.000 <0.05, it can be seen that there is a difference between the pretest and posttest results so it can be concluded that there is an influence by applying the learning model TGT assisted by rotating wheel media for science learning outcomes for fourth grade students at SD N Pati Wetan 03.

Desiccant coated fin tube energy exchanger design optimization implementing KNN-ML tool and adsorption/desorption kinetics analysis using finite difference based transient model

In air conditioning applications, to increase energy exchange capabilities and enhance indoor air quality, the desiccant coated fin tube energy exchanger (DCFTE) appears to be a capable substitute compared to traditional energy exchangers like an adsorber bed and rotary wheel. Hence, for enhancing the air conditioning system's performance, accurate prediction of the adsorption kinetics of DCFTE is crucial. Thus, a K-Nearest Neighbor-Machine Learning (KNN-ML) tool is employed for predicting the exit and design parameters of DCFTE. The impact of the operating parameters on the performance of DCFTE has been assessed by utilizing the KNN-ML tool. To analyze the performance of DCFTE, energy exchange and dehumidification capacity are selected as the performance indices. The optimum operating conditions for a specific operational range are also found using the KNN-ML tool. Moreover, a finite difference approach-based transient model is developed to assess the inlet parameters' effect on the performance characteristics and adsorption/desorption kinetics of DCFTE. The coefficient of performance and moisture removal capacity are selected as the performance indices. Furthermore, the effect of time on the outlet air specific humidity, outlet water temperature, air temperature, and desiccant concentration during the dehumidification and regeneration process is analyzed. The effect of the water vapor partial pressure ratio on adsorption capacity is examined. Moreover, Lewis and Stanton number's influence on the DCFTE performance is analyzed by employing the transient model. Silica gel is utilized as a desiccant.

Investigation of angular aspects of a novel four-sector rotary dehumidifier configuration for HVAC applications

In buildings and industries, different humidity and temperature ranges may be required to fulfill the requirement. Desiccant-based air conditioning is more widely used to control the latent load using solar or waste heat efficiently. This work divides a rotary solid desiccant wheel into four sections: two process sections and two regeneration sections. Air from one process section (P1) is used in a cooling application with the aid of a cooling unit, while air from the other process section (P2) is used for warm and dry air applications. Furthermore, the input conditions and positioning of the regeneration sections (R1 and R2) are such that there is less carryover heat to the P1 section and more carryover heat to the P2 section, which is advantageous for both applications. The major objective of the present work is to investigate the optimal angular divisions of these four sections using a two-dimensional mathematical model. The developed mathematical model results are reported in good agreement with the experimental results of the literature. The optimal rotational speed of the wheel is computed as 15 revolutions per hour, and the optimal regeneration angles for R2 and R1 of the desiccant wheels are 100–110° and 115–125°, respectively.

Study of Copper/Aluminum Bimetallic Tube Rotary Ring Spinning Composite Forming Characteristics

As a plastic forming process developed based on rotary wheel spinning technology, the rotary ring spinning process has the excellent characteristics of high forming accuracy and high material utilization rate, and has been gradually applied to the manufacture of bimetallic composite pipes. In this paper, the forming law of a bimetallic tube in the process of rotary ring spinning was analyzed by numerical simulation and experimentation. The results show that the deformation coordination of the basic and cover tubes increased with the increasing press amount, and the feed ratio had less of an effect on the thickness variation. In addition, the three-way strain of the basic and cover tubes and the degree of influence of the process parameters on the equivalent strain of the tubes were also studied. The results show that the radial strain on both tubes was the largest, followed by the axial strain, and the tangential strain was the smallest; the press amount had the largest effect on the equivalent strain of the tubes, followed by the angle of attack and the feed ratio. These results provide some guidance for the manufacture of high-performance bimetallic composite tubes by rotary ring spinning.

Analysis of direct expansion heat recovery ventilation devices by orthogonal optimization method.

Heat recovery ventilation devices include rectangular plate cross-flow, hexagonal plate combined counter and cross-flow, rotary wheel sensible, sorption rotor hybrid sensible and latent heat exchanger. Currently, existing studies have produced no clear findings on which climatic conditions latent heat recovery would be optimal, and therefore sought to determine in which climatic conditions it would be suitable to use devices that perform latent heat recovery. This study analysed the performance of different heat recovery devices in different climatic conditions in a ventilation project of a sample hotel building. In the case study, while there is a useful heat recovery between 44.01 and 58.68kW at low outdoor temperatures in devices with only sensible heat transfer, this value increases up to 158.42kW, as the outdoor temperature rises. In the heat recovery device providing latent heat transfer, the amount of useful heat recovery varies between 51.34 and 352.16kW at low outdoor temperatures, depending on the outdoor relative humidity, while this amount increases to 411.26 from 773.25kW at high outdoor temperatures. Outdoor temperature and humidity levels required for latent heat recovery was also determined by orthogonal optimization method. By using the orthogonal optimization, the study found that under conditions of high temperature that exceeds 35°C in outdoor ambient temperature, and high humidity that exceeds 60% relative humidity, usage of latent heat recovery devices caused significant differences in total heat recovery ratio. Analysis also concludes that these devices can be used under these conditions.

Pengembangan Media Number Spinning Wheel pada Materi Calistung di Kelas 1 UPT SD Negeri 63 Gresik

Thematic is a learning that covers all aspects and some materials in a lesson, one of them is mathematics. Where learning mathematics is very important in the daily lives of students. Calistung (reading, writing, and counting) material is one of the lessons in mathematics. Using this rotary wheel media can increase students' abilities, interests and creativity in reading, writing and arithmetic materials. Therefore, to understanding the ability to reading, writing, and counting in students is something that is necessary and very important. This study aims to determine the development of Number Spinning Wheel learning media on class 1 calistung material at UPT SD Negeri 63 Gresik.The results of the media expert validation obtained 92.8% which stated that this media was categorized as valid and from the material experts obtained a value of 87.5% which also stated that this media was valid, so it can be concluded that the number spinning wheel media met the valid criteria and effectively used in continous learning.

Thermofluidic characteristics for a novel complementary adsorption-absorption post-combustion partial CO2 capture system

A novel complementary adsorption-absorption post-combustion partial CO2 capture strategy was proposed to decrease the energy penalty by integrating the rotary adsorption wheel with traditional chemical absorption process. The finite volume method is used for modeling the adsorption process, and the absorption process is simulated based on the rate-based model and the double-film theory. The techno-economic analyses of the novel complementary system were performed. In the adsorption part, the CO2 concentration of the flue gas can be effectively improved from 5.0%, 10.0% and 15.0% as much as to 17.3%, 27.0% and 33.7%, respectively. By adjusting the flue gas ducts of the adsorption wheel, the flue gas can be concentrated to a CO2 concentration making the absorption process work economically. The performance of the rotary adsorption wheel influenced by different geometrical and operational parameters were investigated. The energy penalty of the chemical absorption part can be significantly decreased. The major equipment cost was dramatically decreased by 48.6%, and the levelized cost of CO2 capture was decreased by 32.3%, when the CO2 concentration in the flue gas was increased from 5% to 20%. In addition, the acceptable investment of the rotary adsorption wheel has been estimated. The smallest acceptable capital cost of rotary adsorption wheel for coal-fired boiler corresponding to one payback year is 3.72 M$.