Yazar "Mandev, Emre" seçeneğine göre listele

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    Analysis of thermal energy storage in batch processes using phase change materials
    (Springer, 2025) Kaya, Nur Efsan; Ceviz, Mehmet Akif; Afshari, Faraz; Mandev, Emre; Koksal, Huseyin
    Batch reactors are widely utilized in the chemical, pharmaceutical, and food industries due to their simplicity, ease of operation, and maintenance. However, efficient energy management remains a key challenge, especially for systems operating under intermittent conditions. While phase-change materials (PCMs) offer potential for improving energy efficiency by storing and reusing waste heat, integrating heat storage within reactors can compromise their volume and design. This study introduces a novel approach by designing and experimentally testing a PCM heat battery positioned outside the reactor to reduce energy consumption cost in batch processes. By focusing on peak load shifting, the PCM heat battery stores thermal energy during off-peak periods, reducing operational costs and enhancing energy efficiency. The results indicate that energy operating costs can be significantly reduced with a PCM heat battery. Specifically, utilizing the PCM battery under a three-time tariff allows for the efficient use of energy stored at night, reducing the energy cost per batch process by approximately 8%, from 1.72 TL ($0.041) to 1.59 TL ($0.037) for facilities starting operations at 08:00. Furthermore, the findings suggest potential applications in systems like solar energy and highlight the benefits of peak load shifting, offering a sustainable and cost-effective solution for energy management in batch processing.
  • Küçük Resim Yok
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    Comparative thermal and hydraulic performance of Type-22 panel radiators under continuous and pulsating flow
    (Pergamon-Elsevier Science Ltd, 2026) Koksal, Huseyin; Ceviz, Mehmet Akif; Muratcobanoglu, Burak; Mandev, Emre
    Pulsating water-side flow has been proposed as a radiator control strategy to enhance heat emission at low supply temperatures, yet device-level studies rarely quantify thermal gains together with hydraulic costs under matched baselines. This study experimentally investigates the coupled thermal and hydraulic response of a PCCP Type-22 panel radiator operated under continuous and on-off pulsating flow regimes. A dedicated test loop was developed using a temperature-controlled hot-water tank (50 degrees C setpoint) and an Arduino-based driver to impose repeatable pulsation, while measuring inlet/outlet temperatures, instantaneous flow rate, pump electrical energy, and spatiotemporal surface temperatures via infrared thermography. The results show that increasing the continuous flow rate provides the highest absolute heat output, but at the cost of increased pumping energy. In contrast, pulsating operation improves the thermal-hydraulic balance by increasing heat delivery relative to the reference case while reducing pump energy consumption. Among the tested pulsating cases, short-period pulsation produced the most favorable behavior by maintaining a warmer and more spatially stable radiator surface. Longer off-periods promoted deeper surface cooling, reduced the effective emitting area, and weakened the thermal benefit of pulsation. Infrared thermography confirmed that the pulsation period strongly affects surfacetemperature uniformity and temporal stability. Overall, short-period on-off pulsation emerges as the most favorable operating mode when the objective is to increase heat delivery while lowering pumping energy in PCCP-type radiators.