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All Journal Jurnal Pendidikan Vokasi JURNAL DINAMIKA VOKASIONAL TEKNIK MESIN
Mustikaningtyas, Andhita
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Education Mechanical Engineering Social Sciences

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THE PIPE DIAMETER EFFECT ON HEAT TRANSFER OF HELICAL COIL HEAT EXCHANGER IN THE SOLAR WATER HEATER STORAGE TANK Mustikaningtyas, Andhita; Sihana, Sihana; Wijayanti, Ester; Riyandi, Naufal
Jurnal Dinamika Vokasional Teknik Mesin Vol. 9 No. 1 (2024)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v9i1.72714

Abstract

Solar thermal collectors are widely applied in various areas; one of them is solar water heating system. Inside the solar water heating system, there is a heat exchanger system located on thermal storage tank. It needs to develop the most efficient heat exchanger with some limited installation area. Helical coil heat exchanger is chosen as an alternative for saving the installation space by the coil helix geometry. The main difference between the helical heat exchanger and shell and tube heat exchanger is the geometry. This geometry causes differences in heat transfer process, as a result of the secondary flow in the fluid. This study analyzed the effect of the pipe diameter variance to heat transfer of helical coil heat exchanger, applied to solar water heating systems, performed by using three helical coils with pipe diameters variation, with an outer diameter of 6.4; 4.9; 2.95 mm. The heat transfer performance was analyzed by dimensionless number relationship with Wilson Plot technique. The experiment showed that, the performance of helical coil heat exchanger is better at bigger diameter. Forced convection inside the pipe obeyed Nui=ci.Re^0.7 with various  ci  number. The values of  ci  are bigger at bigger pipe diameter and higher hot water temperature.
Readiness of graduate school educational support staff for digital-based distance education Bakhri, Saiful; Siswantoyo, Siswantoyo; Kuswandari, Eny; Amironah , Siti; Widiastuti, Siwi; Susetyaningsih, Ririn; Ramadan, Syahri; Mustikaningtyas, Andhita
Jurnal Pendidikan Vokasi Vol. 15 No. 3 (2025): November
Publisher : ADGVI & Graduate School of Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jpv.v15i3.95751

Abstract

Digital transformation and the implementation of distance education require the readiness of educational support staff as key enablers of technology-based academic services, particularly in the context of vocational and applied higher education. This study aims to analyze the readiness of educational support staff in supporting digital-based distance education in terms of digital literacy, understanding of distance education policies, and the capacity to manage online learning systems. The study employed a descriptive sequential explanatory mixed-methods design. Quantitative data were collected through a Likert-scale questionnaire administered to educational support staff, while qualitative data were obtained through semi-structured interviews. The results indicate that 65% of educational support staff demonstrated moderate to good levels of digital literacy, 60% showed a moderate level of understanding of distance education policies, and only approximately 55% exhibited optimal readiness in managing online learning systems. Qualitative findings reveal that limited access to continuous professional training, diverse educational backgrounds, and uneven institutional support constitute the main barriers to staff readiness. This study concludes that the readiness of educational support staff needs to be systematically strengthened to ensure the effectiveness and sustainability of digital academic services and distance education.  The contribution of this study lies in providing empirical evidence to support capacity-building strategies and institutional policies aimed at strengthening human resource readiness for digital transformation in vocational and applied higher education.
Co-Authors Amironah , Siti Ester Wijayanti Hay's, Riyan Naufal Kuswandari, Eny Ramadan, Syahri Saiful Bakhri Sihana Sihana Siswantoyo Siwi Widiastuti Susetyaningsih, Ririn