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  • Open Access


    Analysis of Profile and Unsteady Flow Performance of Variable Base Circle Radius Scroll Expander

    Junying Wei*, Gang Li, Chenrui Zhang, Wenwen Chang, Jidai Wang

    Frontiers in Heat and Mass Transfer, Vol.21, pp. 199-214, 2023, DOI:10.32604/fhmt.2023.041793

    Abstract To study the complex internal flow field variation and output characteristics of a variable base radius scroll expander, this paper uses dynamic mesh techniques and computational fluid dynamics (CFD) methods to perform transient numerical simulations of a variable base radius scroll expander. Analysis of the flow field in the working cavity of a variable base radius scroll expander at different spindle angles and the effect of different profiles, speeds and pressures on the output characteristics of the scroll expander. The results of the study show that due to the periodic blocking of the inlet by the orbiting scroll, the fluid… More >

  • Open Access



    Aparna Kottapallia , Ramakrishna Konijetib,*

    Frontiers in Heat and Mass Transfer, Vol.19, pp. 1-11, 2022, DOI:10.5098/hmt.19.11

    Abstract Scroll technology is widely used in refrigerators as compressors. This research paper presents the performance of a scroll-type expander derived from a scroll compressor. The research is carried out at low pressures. The effect of mechanical load on performance has been evaluated using compressed air as a working fluid. Two stages of the evaluation process are carried out in this research. In the first stage, the scroll expander model is numerically simulated using the CFD approach to predict the factors influencing the scroll expander performance. In the later stage, an experiment is carried out on a scroll-type expander prototype developed… More >

  • Open Access


    Experimental Investigation of Organic Rankine Cycle (ORC) for Low Temperature Geothermal Fluid: Effect of Pump Rotation and R-134 Working Fluid in Scroll-Expander

    Nugroho Agung Pambudi1,*, Santiko Wibowo1, Ranto1, Lip Huat Saw2

    Energy Engineering, Vol.118, No.5, pp. 1565-1576, 2021, DOI:10.32604/EE.2021.016642

    Abstract Organic Rankine Cycle (ORC) is one of the solutions to utilize a low temperature geothermal fluid for power generation. The ORC system can be placed at the exit of the separator to extract energy from brine. Furthermore, one of the main components of the system and very important is the pump. Therefore, in this research, the pump rotation is examined to investigate the effect on power output and energy efficiency for low temperature geothermal fluid. The rotation is determined by using an inverter with the following frequencies: 7.5, 10, 12.5, 15 and 17.5 Hz, respectively. R-134 working fluid is employed… More >

  • Open Access


    Novel Unilateral Dental Expander Appliance (UDEX): A Compound Innovative Materials

    Hasan Sabah Hasan1,*, Abdallah A. Abdallah2, Imran Khan3, Hala Sadek Alosman4, Ayshan Kolemen5, Bilal Alhayani6

    CMC-Computers, Materials & Continua, Vol.68, No.3, pp. 3499-3511, 2021, DOI:10.32604/cmc.2021.015968

    Abstract True unilateral posterior crossbite in adults is a challenging malocclusion to treat, especially when we need to correct cross-arch segments with unwanted effects on non-cross segments. Conventional expansion methods are expected to have some shortcomings; the Unilateral dental expander appliance used to restore unilateral cross bite dental arch is an uncommon appliance; for this, a designed new device is needed. This paper aimed to invite a new unilateral dental expander appliance (UDEX) to treat unilateral dental posterior crossbite in adults using available dental material, easy to use and handle, well tolerated by the patient, and biocompatible with oral structure. It… More >

  • Open Access


    Improvement and Experimental Study of Scroll Expander for Organic Rankine Cycle

    Lei Li1,2,3,*, Leren Tao2,3, Yanan Gou1, Shan Zhang1

    Energy Engineering, Vol.117, No.4, pp. 225-235, 2020, DOI:10.32604/EE.2020.010892

    Abstract The scroll expander used in organic Rankine cycle (ORC) system is improved, and its performance is analyzed experimentally. The modified profile and inlet hole of the scroll expander are enhanced, and the performance of the scroll expander before and after the improvement is analyzed. The results show that when the inlet pressure exceeds 0.7 MPa, the waist-shaped hole with a larger area is preferable. The scroll expander with a waist-shaped hole has a larger output power and wider optimal pressure range, and when the inlet pressure is 1.6 MPa, the maximum output power increases by 230 W. The output power… More >

  • Open Access


    Study on Pressure Loss of Inlet and Exhaust Flow in Single Screw Expander With Large Internal Volume Ratio

    Zhiyu Guo*, Yuting Wu

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.3, pp. 161-164, 2019, DOI:10.32604/icces.2019.05490

    Abstract Generally, the greater the difference between evaporation and condensation temperature of ORC(Organic Rankie Cycle) is, the higher system efficiency and the larger expansion ratio will be [1,2]. Fig. 1 shows that net efficiency of theoretical cycle and expansion ratio of ORC system changes with evaporation temperature when condensing temperature is 313 K (R123 and HFO-1336mzz (Z) are selected). More >

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