Articles
<![CDATA[Taguchi Method for Development of Mass Flow Rate Correlation using Hydrocarbon Refrigerant Mixture in Capillary Tube ]]>
<![CDATA[Sulaimon, Shodiya]]>;
<![CDATA[Nasution, Henry]]>;
<![CDATA[Aziz, Azhar Abdul]]>;
<![CDATA[Abdul-Rahman, Abdul-Halim]]>;
<![CDATA[Darus, Amer N.]]>
<![CDATA[ Journal of Engineering and Technological Sciences Vol 46, No 2 (2014) ]]>
Publisher : <![CDATA[ITB Journal Publisher, LPPM ITB ]]>
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DOI: 10.5614/j.eng.technol.sci.2014.46.2.2
<![CDATA[The capillary tube is an important control device used in small vapor compression refrigeration systems such as window air-conditioners, household refrigerators and freezers. This paper develops a non-dimensional correlation based on the test results of the adiabatic capillary tube for the mass flow rate through the tube using a hydrocarbon refrigerant mixture of 89.3% propane and 10.7% butane (HCM). The Taguchi method, a statistical experimental design approach, was employed. This approach explores the economic benefit that lies in studies of this nature, where only a small number of experiments are required and yet valid results are obtained. Considering the effects of the capillary tube geometry and the inlet condition of the tube, dimensionless parameters were chosen. The new correlation was also based on the Buckingham Pi theorem. This correlation predicts 86.67% of the present experimental data within a relative deviation of -10% to +10%. The predictions by this correlation were also compared with results in published literature.]]>
<![CDATA[Numerical Study of an Ejector as an Expansion Device in Split-type Air Conditioners for Energy Savings ]]>
<![CDATA[Sumeru, Kasni]]>;
<![CDATA[Sulaimon, Shodiya]]>;
<![CDATA[Ani, Farid Nasir]]>;
<![CDATA[Nasution, Henry]]>
<![CDATA[ Journal of Engineering and Technological Sciences Vol 45, No 2 (2013) ]]>
Publisher : <![CDATA[ITB Journal Publisher, LPPM ITB ]]>
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DOI: 10.5614/j.eng.technol.sci.2013.45.2.6
<![CDATA[The present study describes a numerical approach for determining both the motive nozzle and constant-area diameters of an ejector as an expansion device, based on the cooling capacity of a split-type air-conditioner using R290 as refrigerant. Previous studies have shown that replacement of HCFC R22 with HC290 (propane) in the air conditioner can improve the coefficient of performance (COP). The purpose of replacing the capillary tube with an ejector as an expansion device in a split-type air conditioner using HC290 is to further improve the COP. In developing the model, conservation laws of mass, momentum and energy equations were applied to each part of the ejector. The numerical results show that the motive nozzle diameter remains constant (1.03 mm) under varying condenser temperatures, whereas the diameter of the constant-area decreases as the condenser temperature increases. It was also found that improvement of the COP can reach 32.90% at a condenser temperature of 55 °C. From the results mentioned above, it can be concluded that the use of an ejector can further improve the COP of a split-type air conditioner using HC290 as working fluid.]]>
<![CDATA[DEVELOPMENT OF FUZZY LOGIC CONTROL FOR VEHICLE AIR CONDITIONING SYSTEM ]]>
<![CDATA[Henry Nasution]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 6, No 2: August 2008 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v6i2.553
<![CDATA[A vehicle air conditioning system is experimentally investigated. Measurements were taken during the experimental period at a time interval of one minute for a set point temperature of 22, 23 and 24oC with internal heat loads of 0, 1 and 2 kW. The cabin temperature and the speed of the compressor were varied and the performance of the system, energy consumption and energy saving ware analyzed. The main objective of the experimental work is to evaluate the energy saving obtained when the fuzzy logic control (FLC) algorithm, through an inverter, continuously regulates the compressor speed. It demonstrates better control of the compressor operation in terms of energy consumption as compared to the control by using a thermostat imposing On/Off cycles on the compressor at the nominal frequency of 50 Hz. The experimental set-up consists of original components from the air conditioning system of a compact passenger vehicle. The experimental results indicate that the proposed technique can save energy and improve indoor comfort significantly for vehicle air conditioning systems compared to the conventional (On/Off) control technique.]]>
<![CDATA[Energy Analysis for Air Conditioning System Using Fuzzy Logic Controller ]]>
<![CDATA[Henry Nasution]]>;
<![CDATA[Hishamuddin Jamaluddin]]>;
<![CDATA[Jamaluddin Mohd. Syeriff]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 9, No 1: April 2011 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v9i1.680
<![CDATA[ Reducing energy consumption and to ensure thermal comfort are two important considerations for the designing an air conditioning system. An alternative approach to reduce energy consumption proposed in this study is to use a variable speed compressor. The control strategy will be proposed using the fuzzy logic controller (FLC). FLC was developed to imitate the performance of human expert operators by encoding their knowledge in the form of linguistic rules. The system is installed on a thermal environmental room with a data acquisition system to monitor the temperature of the room, coefficient of performance (COP), energy consumption and energy saving. The measurements taken during the two hour experimental periods at 5-minutes interval times for temperature setpoints of 20oC, 22oC and 24oC with internal heat loads 0, 500, 700 and 1000 W. The experimental results indicate that the proposed technique can save energy in comparison with On/Off and proportional-integral-derivative (PID) control.]]>
<![CDATA[Numerical Study of an Ejector as an Expansion Device in Split-type Air Conditioners for Energy Savings ]]>
<![CDATA[Kasni Sumeru]]>;
<![CDATA[Shodiya Sulaimon]]>;
<![CDATA[Farid Nasir Ani]]>;
<![CDATA[Henry Nasution]]>
<![CDATA[ Journal of Engineering and Technological Sciences Vol. 45 No. 2 (2013) ]]>
Publisher : <![CDATA[Institute for Research and Community Services, Institut Teknologi Bandung ]]>
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DOI: 10.5614/j.eng.technol.sci.2013.45.2.6
<![CDATA[The present study describes a numerical approach for determining both the motive nozzle and constant-area diameters of an ejector as an expansion device, based on the cooling capacity of a split-type air-conditioner using R290 as refrigerant. Previous studies have shown that replacement of HCFC R22 with HC290 (propane) in the air conditioner can improve the coefficient of performance (COP). The purpose of replacing the capillary tube with an ejector as an expansion device in a split-type air conditioner using HC290 is to further improve the COP. In developing the model, conservation laws of mass, momentum and energy equations were applied to each part of the ejector. The numerical results show that the motive nozzle diameter remains constant (1.03 mm) under varying condenser temperatures, whereas the diameter of the constant-area decreases as the condenser temperature increases. It was also found that improvement of the COP can reach 32.90% at a condenser temperature of 55 °C. From the results mentioned above, it can be concluded that the use of an ejector can further improve the COP of a split-type air conditioner using HC290 as working fluid.]]>
<![CDATA[Taguchi Method for Development of Mass Flow Rate Correlation using Hydrocarbon Refrigerant Mixture in Capillary Tube ]]>
<![CDATA[Shodiya Sulaimon]]>;
<![CDATA[Henry Nasution]]>;
<![CDATA[Azhar Abdul Aziz]]>;
<![CDATA[Abdul-Halim Abdul-Rahman]]>;
<![CDATA[Amer N. Darus]]>
<![CDATA[ Journal of Engineering and Technological Sciences Vol. 46 No. 2 (2014) ]]>
Publisher : <![CDATA[Institute for Research and Community Services, Institut Teknologi Bandung ]]>
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DOI: 10.5614/j.eng.technol.sci.2014.46.2.2
<![CDATA[The capillary tube is an important control device used in small vapor compression refrigeration systems such as window air-conditioners, household refrigerators and freezers. This paper develops a non-dimensional correlation based on the test results of the adiabatic capillary tube for the mass flow rate through the tube using a hydrocarbon refrigerant mixture of 89.3% propane and 10.7% butane (HCM). The Taguchi method, a statistical experimental design approach, was employed. This approach explores the economic benefit that lies in studies of this nature, where only a small number of experiments are required and yet valid results are obtained. Considering the effects of the capillary tube geometry and the inlet condition of the tube, dimensionless parameters were chosen. The new correlation was also based on the Buckingham Pi theorem. This correlation predicts 86.67% of the present experimental data within a relative deviation of -10% to +10%. The predictions by this correlation were also compared with results in published literature.]]>
<![CDATA[ENERGY USE PERFORMANCE IN THE BUILDING COOLING SYSTEM USING A TERMOSTAT CONTROL, ON / OFF DIGITAL AND FUZZY LOGIC ]]>
<![CDATA[Henry Nasution]]>
<![CDATA[ Jurnal Penelitian Saintek Vol 16, No 2: Oktober 2011 ]]>
Publisher : <![CDATA[Institute of Research and Community Services, Universitas Negeri Yogyakarta ]]>
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DOI: 10.21831/jps.v16i2.3388
<![CDATA[In this study, an alternative solution to reduce energy consumption in building airconditioning system is proposed and introduced. The operation and energy consumption of the system operated as either with the new control system or with the traditional on/off control were compared. Measurements were taken during the experimental period at a time interval of one minute for a set point temperature of 22 and 23o C. The room temperature, energy consumption and energy-saving ware analyzed. The main objective is to determine the amount of energy saved when a digital on/off and fuzzy logic controller is applied to the air-conditioning system. The experimental results show that significant energy savings of approximately 24 to 43% for digital on/off and 48 to 73% for fuzzy logic control were obtained. The results also indicated that the digital on/off and fuzzy logic control can save energy and improve indoor comfort significantly for building AC system compared to the thermostat control technique.]]>
<![CDATA[KAJI EKSPERIMENTAL UNTUK MENINGKATKAN PERFORMASI DESTILASI SURYA BASIN TIGA TINGKAT MENGGUNAKAN BEBERAPA BAHAN PENYIMPAN PANAS ]]>
<![CDATA[Mulyanef Mulyanef]]>;
<![CDATA[Melda Sari]]>;
<![CDATA[Wira Mario]]>;
<![CDATA[Henry Nasution]]>
<![CDATA[ Jurnal Teknik Mesin (JTM) Vol 2, No 2 (2012) ]]>
Publisher : <![CDATA[LP2M - Institut Teknologi Padang ]]>
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<![CDATA[Tujuan penelitian ini adalah untuk meningkatkan prestasi dari alat destilasi surya basin tiga tingkat dengan menggunakan berbagai bahan penyimpan panas (aluminium, stainless steel dan seng), alat uji destilasi surya ini dapat berproduksi terus menerus selama 24 jam. luas kolektor bagian bawah 0,65 m2, bagian tengah 0,4 m2 dan bagian atas 0,4 m2.Prinsip kerja alat yaitu radiasi matahari dirubah menjadi energi panas pada kolektor, panas akan terkumpul di dalam plat penyerap dan memanaskan air laut yang berada pada setiap basin. Untuk meningkatkan produktivitas air bersih, diletakkan bahan penyimpan panas pada basin bagian bawah. Hasil pengujian menunjukkan pemakaian stainlees steel sebagai penyimpan panas dapat menghasilkan produktivitas air bersih lebih tinggi dibandingkan dengan bahan penyimpan panas dari seng dan aluminium.]]>
<![CDATA[KAJI EKSPERIMENTAL UNTUK MENINGKATKAN PERFORMASI DESTILASI SURYA BASIN TIGA TINGKAT MENGGUNAKAN BEBERAPA BAHAN PENYIMPAN PANAS ]]>
<![CDATA[Mulyanef]]>;
<![CDATA[Melda Sari]]>;
<![CDATA[Wira Mario]]>;
<![CDATA[Henry Nasution]]>
<![CDATA[ Jurnal Teknik Mesin Vol 2 No 1 (2012): Jurnal Teknik Mesin Vol.2 No.1 Oktober 2012 ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP ]]>
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DOI: 10.21063/jtm.2012.v2.i1.17-12
<![CDATA[Tujuan penelitian ini adalah untuk meningkatkan prestasi dari alat destilasi surya basin tiga tingkat dengan menggunakan berbagai bahan penyimpan panas (aluminium, stainless steel dan seng), alat uji destilasi surya ini dapat berproduksi terus menerus selama 24 jam. luas kolektor bagian bawah 0,65 m2 , bagian tengah 0,4 m2 dan bagian atas 0,4 m 2 . Prinsip kerja alat yaitu radiasi matahari dirubah menjadi energi panas pada kolektor, panas akan terkumpul di dalam plat penyerap dan memanaskan air laut yang berada pada setiap basin. Untuk meningkatkan produktivitas air bersih, diletakkan bahan penyimpan panas pada basin bagian bawah. Hasil pengujian menunjukkan pemakaian stainlees steel sebagai penyimpan panas dapat menghasilkan produktivitas air bersih lebih tinggi dibandingkan dengan bahan penyimpan panas dari seng dan aluminium.]]>
<![CDATA[Self-Discharging and Corrosion Problems in Vanadium Redox Flow Battery ]]>
<![CDATA[Dena Hendriana]]>;
<![CDATA[Mochamad Hamdan Aziz]]>;
<![CDATA[Yohanes Acep Nanang Kardana]]>;
<![CDATA[Muhamad Lutfi Rachmat]]>;
<![CDATA[Gembong Baskoro]]>;
<![CDATA[Henry Nasution]]>
<![CDATA[ Reaktor Volume 22 No. 3 December 2022 ]]>
Publisher : <![CDATA[Dept. of Chemical Engineering, Diponegoro University ]]>
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DOI: 10.14710/reaktor.22.3.77-85
<![CDATA[Vanadium redox flow battery (VRFB) has a potential for large energy storage system due to its independence of energy capacity and power generation. VRFB is known to have challenges of high price, corrosion problem and lower energy efficiency. In this work, VRFB prototype with all components from existing parts sold in the market has been assembled and tested. Estimated electrochemical reactions are discussed for initial charging process with Vanadium Pentoxide powder as initial state to obtain fully charged battery state with V2+ ion in anolyte and VO2 + ion in catholyte. Material corrosion testes were done by immersing the material in a Vanadium electrolyte and by using the material as a bipolar plate in the VRFB system. Immersion test showed that copper, steel, lead and zinc were corroded badly. In bipolar plate material test, stainless steel 316, aluminum and silver plates were corroded after some hours of electric charging process. Simple carbon plastic composites and 3-mm thickness graphite plates were tested in the bipolar plate material test and failed due to corrosion problem as well. In the VRFB prototype, corrosion problems occurred on brass nipples, polyurethane plastic pipes and porous silicone seals. Stronger plastic components and better quality of silicone seals are needed for VRFB. Significant finding of this study is possible spontaneous chemical reaction within anolyte tank as a potential of self-discharging reaction which other researchers have not identified. Also, another finding from this study is that good bipolar plate for VRFB is not easily available in the market.]]>
