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All Journal Jurnal Polimesin
Pujianto, Muhammad Edi
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Automotive Engineering Control & Systems Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering

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Numerical study on the effect of box and polygon geometry in fin and tube heat exchanger on fluid flow and heat transfer Nugroho, Agung; Safi'i, Muhammad; Romadhon, Bukhori Putra; Wahid, Muhammad Abdul; Pujianto, Muhammad Edi
Jurnal Polimesin Vol 22, No 6 (2024): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i6.5624

Abstract

Currently, fin and tube heat exchangers are widely used in various engineering applications, including modern heat exchangers, automotive radiators, and Air Conditioning (AC) systems such as evaporators, and condensers. Enhancing their performance necessitates innovative designs, advanced application, and optimizes geometries to improve heat transfer efficiency. This study investigates the effect of box and polygon geometries on fluid flow and heat transfer in a split Air Conditioner (AC) fin and tube heat exchanger using simulation software. The research examines two tube arrangement-inline and staggered-across different fluid velocities (0.5 m/s, 1 m/s, 1.5 m/s, and 2.5 m/s) and heat flux values (100 W/m2 , 125 W/m2, 125 W/m2, and 150 W/m2 ). The numerical study revealed that the best thermal and hydraulic performance of the fin and tube heat exchanger, based on geometry variations between box and polygon tubes, was achieved with the polygon tube geometry, which resulted in a lower temperature around 23.41°C. This temperature confirmed an increase in heat transfer coefficient by approximately 5% and Nusselt number by about 3%. The best performance overall, considering both thermal and hydraulic aspects, was observed in the inline arrangement, especially for the polygon tube, which resulted in a lower temperature of around 26.38°C. This confirmed an improvement in the heat transfer coefficient by about 4% and the Nusselt number by 2.5%.
Performance Air conditioner on retrofitted refrigerant hydrocarbon Pujianto, Muhammad Edi; Nugroho, Agung
Jurnal Polimesin Vol 22, No 1 (2024): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i1.3584

Abstract

Synthetic refrigerants used in air conditioner (AC) are very important in depleting the ozone layer and prohibiting global warming. This has led to the application of R32 and Musicool 22 (MC22) as a substitute for R22 because refrigerant is considered more environmentally friendly. Therefore, this research aimed to compare the performance of applying both R32 and MC22 refrigerants in 1 PK split AC using the coefficient of performance (COP) as the indicator for AC performance and compressor power consumption. MC22 filling mass was varied at 90% (202.14 grams), 100% (224.6 grams), and 110% (247.6 grams) of R32 mass, and condenser inlet temperatures at 28°C, 30°C, 32°C, and 34°C. The results showed that MC22 could be used as a viable alternative to R32 due to the higher refrigeration effect value of 332.36 kJ/kg recorded for refrigerant
Co-Authors Nugroho, Agung Romadhon, Bukhori Putra Safi'i, Muhammad Wahid, Muhammad Abdul