Articles
<![CDATA[Improved Performance of the Vapor Compression Cooling System Using A Combination of Condensers-Evaporative Cooling ]]>
<![CDATA[Arfidian Rachman]]>;
<![CDATA[Sulaiman]]>
<![CDATA[ Jurnal Teknik Mesin Vol 8 No 1 (2018): Jurnal Teknik Mesin Vol.8 No.1 April 2018 ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP ]]>
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DOI: 10.21063/jtm.2018.v8.i1.22-26
<![CDATA[Energy use is a major problem in the vapor compression air cooling system, especially in areas with very hot weather conditions. In hot weather conditions, the performance of the system has decreased dramatically and electricity consumption has increased significantly. Combined Condensor with evaporative cooling will increase the heat removal process by using an evaporative cooling effect that will increase the efficiency of energy use. This paper presents the study of the use of evaporative cooling and condenser. This paper mainly calculated energy consumption in steam compression cooling systems and related problems. From the results of this study, the use of condensers with evaporative cooling, power consumption can be reduced to 46% and performance coefficient (COP) can be increased by about 12%, with 1,2 kW cooling capacity.]]>
<![CDATA[A Mathematical Model of Desiccant Wheel in Desiccant Cooling ]]>
<![CDATA[Arfidian Rachman]]>
<![CDATA[ Jurnal Teknik Mesin Vol 10 No 1 (2020): Jurnal Teknik Mesin Vol.10 No.1 April 2020 ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP ]]>
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DOI: 10.21063/jtm.2020.v10.i1.53-59
<![CDATA[The desiccant wheel performance of desiccant cooling system components is very important whose function is to regulate air humidity levels as well as to the capability, size and cost of the entire system. Mathematical models for predicting the performance of desiccant wheels in the development of mathematical models is one of the effective methods for analyzing the performance of wheel this moisture-reducing. This mathematical model can also be used in guiding system operation, delivering experimental results and automation in designing this cooling system. The purpose of this paper is to provide an overview of efforts to mathematically model the process of heat transfer and mass transfer that occurs in the moisture-reducing wheel. The desiccant wheel model built here is a gas and solid system including basic principles, heat and mass transfer mechanism and model building. The model is based on ideal assumptions, equations, additional conditions and the method of solution and also the main results. The gas-solid model is a more precise and more complex model than the other models. From these results the evolutionary process of the mathematical model is obtained and the aspects of calculation of pressure loss, air leakage, and optimal rotation speed of the drying wheel / dehumification.]]>
<![CDATA[Design and Performance Horizontal Axis Wind Turbine Taper Type ]]>
<![CDATA[Arfidian Rachman]]>;
<![CDATA[Putri Pratiwi]]>;
<![CDATA[Lucky Ashari]]>
<![CDATA[ Jurnal Teknik Mesin Vol 9 No 2 (2019): Jurnal Teknik Mesin Vol.9 No.2 October 2019 ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP ]]>
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DOI: 10.21063/jtm.2019.v9.i2.59-64
<![CDATA[The potential of wind energy in Indonesia is sufficient for the development of renewable energy based on wind turbine, because the average wind speed ranges from 3-12 m / s. The wind that blows is dominated by West, Southwest, and Northwest winds with speeds sometimes reaching 2.5 m / s to 20 m / s. The designed wind turbine is a Taper type blade where the comparison of the tip chord to the base is 1.3: 1, with a blade length of 1 m. Where the blades are designed to be able to spin in high-speed winds and to maximize the efficiency that can be obtained. The design result that the highest peak is 59% at TSR 7 and the blades start to spin in winds of 8.7 m / s and at winds of 12 m / s the power produced reaches 3255 watts.]]>
<![CDATA[Improved Performance Cooling System with Integrated Condenser and Direct Evaporator Cooling ]]>
<![CDATA[Arfidian Rachman]]>
<![CDATA[ Jurnal Teknik Mesin Vol 9 No 1 (2019): Jurnal Teknik Mesin Vol.9 No.1 April 2019 ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP ]]>
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DOI: 10.21063/jtm.2019.v9.i1.41-45
<![CDATA[For areas with very hot and humid weather conditions increased latent and sensible loads are a major problem in cooling systems that will increase compressor work so that electricity consumption will also increase. Combined Condenser with direct evaporative cooling will increase the heat removal process by using an evaporative cooler effect that will increase the efficiency of energy use. This paper presents the study of the use of evaporative cooling and condenser. This paper mainly calculated energy consumption in steam compression cooling systems and related problems. From the results of this study, the use of condensers with evaporative cooling, power consumption can be reduced to 46% and performance of coefficient (COP) can be increased by about 12%, with 1,2 kW cooling capacity.]]>
<![CDATA[KAJIAN EKSPERIMEN SISTEM PENGKONDISIAN UDARA MENGGUNAKAN TENAGA SURYA UNTUK IKLIM TROPIS ]]>
<![CDATA[Arfidian Rachman]]>
<![CDATA[ Jurnal Teknik Mesin Vol 5 No 1 (2015): Jurnal Teknik Mesin Vol.5 No.1 April 2015 ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP ]]>
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DOI: 10.21063/jtm.2015.v5.i1.29-33
<![CDATA[Penelitian ini adalah menghasilkan suatu sistem pengkondisian udara yang hemat energi dan ramah lingkungan, karena menggunakan tenaga matahari sebagai sumber energi termal dan tidak menggunakan refrigerant sebagai fluida kerjanya. Sistem ini dirancang untuk memenuhi kebutuhan ruang pendinginan di bagunan, di mana sistem ini menghasilkan penghematan energi mencapai 80% dibandingkan sistem pengkondisian udara pemampatan gas. Kelebihan sistem ini adalah dapat mengontrol kelembabapan dan suhu secara terpisah. Analisis ekperimental dan simulasi untuk masing-masing komponen dikhususkan pada variasi kinerja sebagai fungsi dari laju aliran udara pada bagian proses dan regenerasi, didapatkan efisiensi kolektor matahari adalah 70% pada intensitas matahari adalah 0,606 kW/m2 , pada kecepatan aliran air 4.5 m/s dengan debit aliran air 10 liter/menit. Untuk bagian sistem pengkondisian udara menggunakan dua buah roda, yaitu roda dehumidifikasi sebagai penurun kelembapan dan roda perpindahan panas sebagai penurun suhu. Kecepatan aliran udara proses dan udara regenerasi pada kedua-dua roda yaitu 3,77m/s dengan kapasitas 500m3 /jam. Dari analisa eksperimen dan simulasi didapat efektifitas roda pengering dan roda perpindahan panas adalah 56% dan 72%. Hasil dari eksperimen didapatkan nilai COP sistem ini adalah 0,3, dengan kapasitas pendinginan 5,6kW. Dengan rasio pengembalian ekonomi 5 tahun.]]>
<![CDATA[Experimental Investigation on Performance ByPass Cycle Multi-Split Cooling System-VRF ]]>
<![CDATA[Arfidian Rachman]]>;
<![CDATA[Nofriady Handra]]>;
<![CDATA[Lisa Nesti]]>
<![CDATA[ Jurnal Teknik Mesin Vol 11 No 2 (2021): Jurnal Teknik Mesin Vol.11 No.2 October 2021 ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP ]]>
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DOI: 10.21063/jtm.2021.v11.i2.179-183
<![CDATA[Variable refrigerant flow air-conditioning (VRF) systems are important and widely used building energy systems around the world. In this study, the performance of a multi-split VRF system using the bypass cycle is evaluated using the experiment as a possible sub-cooling method to prevent flash gas generation in liquid pipelines. The experimental for the multi-split VRF system is developed by considering the applications of the bypass cycle, and is validated with experimental data. The results of the tests that have been carried out are obtained in the vapor compression cycle with a bypass cycle, an increase in cooling capacity of 2.96% and an energy saving ratio (EER) of 1.72%. The input power of the bypass cycle is reduced by up to 2.45% when the performance of the multi-split VRF systems with bypass cycle cooling capacity conditions.]]>
<![CDATA[Study of the VRF/VRV Air Conditioning System in the Hospital: A Review of Economic and Environmental Aspects ]]>
<![CDATA[Arfidian Rachman]]>;
<![CDATA[Lisa Nesti]]>;
<![CDATA[Asmara Yanto]]>
<![CDATA[ Jurnal Teknik Mesin Vol 12 No 1 (2022): Jurnal Teknik Mesin Vol.12 No.1 April 2022 ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP ]]>
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DOI: 10.21063/jtm.2022.v12.i1.17-25
<![CDATA[Heating, ventilation and air cooling (HVAC) systems are the largest users of electrical energy in the hospital. The results showed that hospitals represent about 60% of the total energy consumption in the utility building sector. In this paper, it is presented about energy efficiency and the potential for energy savings in HVAC systems in hospitals. Conditioning systems with Variable Refrigerant Flow (VRF) or Variable Refrigerant Volume (VRV) Technology allow for greater energy efficiency and cost savings compared to traditional HVAC systems.]]>
<![CDATA[EVALUASI KINERJA SISTEM PENDINGIN KOMPRESI UAP VRF DENGAN SIKLUS INJEKSI ]]>
<![CDATA[Rachman, Arfidian]]>;
<![CDATA[Yuana Dewi, Arfita]]>;
<![CDATA[Effendi, Asnal]]>;
<![CDATA[Nesti, Lisa]]>
<![CDATA[ Jurnal Teknologi dan Vokasi Vol 1 No 1 (2023): Jurnal Teknologi dan Vokasi ]]>
Publisher : <![CDATA[ITP Press ]]>
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DOI: 10.21063/jtv.2023.1.1.86-92
<![CDATA[As a result of a decrease in the mass flow rate at the inlet section of a variable refrigerant flow (VRF) cooling system, the refrigerant flow system performs poorly. To increase efficiency the steam injection cycle method is used. The effects of steam injection are theoretically explored in this study over a wide range of medium pressures and ambient temperatures, and the findings are supported by experimental data. Compressor heating capacity, input power, coefficient of performance (COP), and isentropic efficiency are all affected by pressure. At low ambient temperatures, the increase in COP by steam injection is remarkable. In this study, the performance of the cooling system with the injection cycle was evaluated, the system with this injection cycle resulted in an increase in cooling capacity of 3.26% and an energy efficiency ratio (EER) of 2.32%.]]>
<![CDATA[TINJAUAN VARIABEL REFRIGERANT VOLUME ]]>
<![CDATA[Rachman, Arfidian]]>;
<![CDATA[Yuana Dewi, Arfita]]>;
<![CDATA[Effendi, Asnal]]>;
<![CDATA[Nesti, Lisa]]>
<![CDATA[ Jurnal Teknologi dan Vokasi Vol 1 No 2 (2023): Jurnal Teknologi dan Vokasi ]]>
Publisher : <![CDATA[ITP Press ]]>
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DOI: 10.21063/jtv.2023.1.2.111-120
<![CDATA[VRV systems are multi-split HVAC systems that maintain different portions by varying refrigerant volume. These systems control refrigerant volume for efficiency and dependability. This review aims to identify VRV system elements affecting operational and performance factors. Previous studies are crucial for future large-scale VRV development.]]>
<![CDATA[EXPERIMENTAL ANALYSIS OF HEAT RECOVERY WHEEL FOR TROPICAL CLIMATE ]]>
<![CDATA[Rachman, Arfidian]]>;
<![CDATA[Yuana Dewi Rachman, Arfita]]>;
<![CDATA[Effendi, Asnal]]>;
<![CDATA[Nesti, Lisa]]>
<![CDATA[ Jurnal Teknologi dan Vokasi Vol 2 No 1 (2024): Jurnal Teknologi dan Vokasi ]]>
Publisher : <![CDATA[ITP Press ]]>
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DOI: 10.21063/jtv.2024.2.1.92-96
<![CDATA[This paper presented and used experimental analysis to examine design that integrates an active heat recovery wheel mechanism into a windcatcher. A rotational thermal heat recovery is incorporated into the windcatcher channel of the proposed system. An experiment was conducted to examine how the heat recovery mechanism affected the windcatcher performance, demonstrating the system ability to provide the necessary fresh air rates. A test room model, measuring 4x4x3 meters and depicting a small classroom, was integrated with the windcatcher model. Ventilation rates managed to supply sufficient ventilation even with the rotational heat recovery wheel blocked. This active recovery has the potential to lessen the demand on space heating systems in addition to providing enough ventilation. The heat in the exhaust airstreams was caught and transferred to the incoming airstream, boosting the temperature between 7-9oC depending on the indoor/outdoor conditions. This indicates that there is a great deal of room for further development of the idea, allowing for larger-scale testing and investigation of the system's heat transfer characteristics.]]>
