Wahab Ohoirenan, Emanuel Alexander Rettob, Herman Dumatubun

ANALISIS PERPINDAHAN PANAS PADA ALIRAN SEARAH (CURRENT FLOW) DENGEN PEMANFAATAN PEMANAS HIETER SISTEM HEAT EXHANGER

Introduction

Analisis perpindahan panas pada aliran searah (current flow) dengen pemanfaatan pemanas hieter sistem heat exhanger. Analisis perpindahan panas pada aliran searah menggunakan pemanas hieter dan sistem heat exchanger. Meneliti efek kecepatan aliran pada laju perpindahan panas air.

Abstract

Penggunaan dan pemanfaatan hiter semakin luas dan menyeluruh baik dalam kehidupan sehari-hari maupun penerapan teknologi. penukar kalor selain dapat memperluas permukaan (A) juga alat penukar kalor dapat mempengaruhi pola aliran fluida dan dapat membentuk vortex. kecepatan aliran akan mempengaruhi pencampuran fluida yang akan menyebabkan aliran semakin acak sehingga laju perpindahan panas pada air heater akan meningkat pula. Penelitian ini mempergunakan arah aliran searah dan memanfaatkan hiater sebagai pemanas air dengan debit air 0.027, 0.040 dan 0.054 m3/s baik air panas maupun air dingin dan menghasilkan perpindahan panas yang berbeda yakni untuk air panas maka perpindahan panas sebesar 0.037 watt dan perpindahan panas untuk air dingin sebesar 0.373 watt.

Review

The manuscript, "ANALISIS PERPINDAHAN PANAS PADA ALIRAN SEARAH (CURRENT FLOW) DENGEN PEMANFAATAN PEMANAS HIETER SISTEM HEAT EXHANGER," investigates heat transfer in a co-current flow system utilizing a heater within a heat exchanger setup. The abstract highlights the growing importance of heaters and heat exchangers in various applications, positing that flow patterns, such as vortex formation, and fluid mixing due to velocity can enhance heat transfer rates. The study aims to analyze this phenomenon by varying water flow rates for both hot and cold water streams, claiming to produce differing heat transfer results. On the positive side, the study explores a relevant engineering problem, specifically water heating, and systematically varies flow rates (0.027, 0.040, and 0.054 m³/s) which is a sound experimental approach. The abstract presents distinct heat transfer values for hot (0.037 Watt) and cold (0.373 Watt) water, suggesting a comparative analysis. However, several critical points require clarification. The most immediate concern is the incredibly low reported heat transfer values (in Watts) given the high flow rates (m³/s). These values are atypical for practical heating systems and raise significant questions about the units, scale, or measurement methodology. Furthermore, the abstract's description of the system as "pemanfaatan hiater sebagai pemanas air dengan debit air" followed by discussion of "penukar kalor" and "air heater" creates ambiguity regarding the specific experimental configuration. Details on the type of heat exchanger, heater power, temperature differences, and heat transfer area are notably absent, making it difficult to assess the validity and scope of the results. The mention of vortex formation and random flow, while conceptually relevant, is not explicitly linked to direct observation or analysis within this specific study as presented in the abstract. To enhance the clarity and scientific rigor of this work, the authors must provide a much more detailed description of the experimental setup and methodology in the full paper, especially regarding the heat exchanger design and heater specifications. Crucially, the units and magnitude of the reported heat transfer values must be thoroughly re-evaluated and explained, as they currently undermine the credibility of the findings. A clearer distinction between the roles of the heater and the heat exchanger within the system is also necessary. Expanding on the analysis of how varying flow rates specifically impact heat transfer coefficients, effectiveness, or overall heat transfer (U-value) would significantly strengthen the paper's contribution. If these fundamental issues are addressed, particularly the data consistency and methodological transparency, the study has the potential to offer valuable insights into the performance of heater-integrated heat exchanger systems.

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