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Kaji Eksperimental Pengunaan R22 dan R410A Berdasarkan Variasi Laku Aliran Massa Pada Mesin AC Dian Wahyu -; Nasrullah - -; Khairul Amri -
Jurnal Ilmiah Poli Rekayasa Vol 9, No 2 (2014)
Publisher : Pusat Penelitian dan pengabdian kepada Masyarakat (P3M) Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (290.432 KB) | DOI: 10.30630/jipr.9.2.60

Abstract

The development of the use of air conditioning machines (AC machines) is very high , due to the increased consumption of electricity for household needs are also increasing . Based on field observations of R22 refrigerant is still widely used in commercial air conditioning machines , where the refrigerant has properties that are not friendly to the environment . R410A refrigerant has been recommended to replace worn R22 . It became one of the rationale for conducting the assessment directly to efforts to reduce electricity consumption due to the use of air conditioning machines in the household and the efforts to preserve the environment . The research was conducted on a commercial air conditioning machines by testing the engine for both types of refrigerant ( R22 and R410A ) . Testing the engine characteristics , tested by varying the refrigerant mass flow rate for both refrigerants . The test results showed , electricity consumption ( compressor power ) for the use of both types of refrigerants is similar but uses R410A refrigerant produces a greater cooling effect than by using refrigerant R22 . In Overall effect of the variation of mass flow rate for both refrigerants clearly evident , the increase in mass flow rate causes enhancement of several variables such as the increase in compressor power , cooling effect , the effect of heat release , but for the coeficient of perfomance ( COP ) , the addition of the mass flow rate after COP The optimum value of the COP does not increase anymore . In this study, the highest COP values obtained in the refrigerant mass flow rate 3.4 g / s for R410A and R22 for 1.9 has the highest COP of 1.7 at a flow rate of refrigerant mass 3 g / s . For maximum cooling impact , generated by 0.502 kW to 0.572 kW usage for R22 and R410A.
Experimental Study of Heat Pipe Solar Collector for Energy Supply to Heat Pump Wahyu, Dian
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Publisher : Kopertis Wilayah X

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1124.379 KB)

Abstract

Heat pipe solar collectors with heat absorber with a size of 1.13 m x 2 m x 0.12 m with 1.87 m2 aperture area has been created and tested to produce hot water which will be used for energy supply to heat pump. Heat pipes are made using water as the heat carrier medium and use stainless steel mesh wick 100 as a tool that helps accelerate the flow of condensate inside the heat pipe. Tests conducted heat pipe heat pipe first before selected and assembled into a solar water heating collectors. Testing is done by using heat pipes 1.000 mL 100 oC temperature hot water as a heat source and a heat pipe evaporator also tested by direct solar radiation. The tests are done to see the response speed (τ) heat pipe in heat transfer. Filling ratio obtained from testing the best heat pipe is 10%. Testing of solar collector with heat pipe absorber has been conducted during the month of June 2013 in the laboratory of solar Institut Teknologi Bandung (ITB) using the standard American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE 93-2003). The efficiency of solar water heating collectors is strongly influenced by solar irradiance and the temperature difference between incoming fluid collector with the environment (Tfi-Ta). The test results showed the highest efficiency of 35.8% is obtained when the temperature difference between incoming fluid and ambient temperature is close to zero. To get hot water at a flow rate of at least 50oC 0,25 L / min, the necessary irradiance of 750 W / m2. Generally, during the trial obtained water output temperature solar heating collectors from 8:30 - 9: 40 pm and 15: 40 - 17: 30 pm is below 50 °C, while at 9:40 - 15: 40 obtained collector output water temperatures above 50 ° C , Thus, it can be concluded that the heat pipe solar collectors are designed can be used to replace the evacuated tube collector in supplying heat for the heat pump. An advantage of using heat pipe solar collectors tend to be more economical and can be domestically produced.
Experimental Study of Heat Pipe for Solar Collector Heater Wahyu, Dian
Jurnal Teknik Mesin (JTM) Vol 6, No 1 (2016)
Publisher : LP2M - Institut Teknologi Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1047.682 KB)

Abstract

Heat pipes with a size of 0.0127 m diameter x 1.3 m lenght x 0.0008 m thick and absorber with a size of 1m length x 0.1 m width has been created and tested to be used as a solar collector heating element. Heat pipes are made using water as the heat transport medium and using a stainless steel mesh wick 120 as a tool that helps accelerate the flow of condensate inside the heat pipe. Testing of heat pipes will be do in two condition at an inclination of 30o , before the heat pipes selected as the heating element in the solar collector. Testing of heat pipe on the first condition is done by using 1,000 ml of hot water temperature of 100oC with the power supply of 20 watts as a heat source in the evaporator side and further testing of pipe heat was tested by direct solar radiation, this test is intended to see directly if heat pipe was made able to work in conditions that are expected. Tests are done to see the heat transfer capacity and response speed (τ) of the heat pipe. Based on testing obtained the fastest response in the heat pipes transfer of the heat contained in the filling ratio of 20% with the heat transfer efficiency of 75%.
Effect of Special Tool Completeness during Regular Service at Two Official Honda Workshops (HCM & CPM) In Padang on Customer Satisfaction Wahyu, Dian
Jurnal Teknik Mesin (JTM) Vol 8, No 2 (2018)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

AHASS HCM and CPM workshops are Honda's official workshops separated by a distance of only 1.6 km located in the city of Padang. The number of customers in these two workshops is very much different, even though the HCM workshop has a better form of building and facilities compared to the CPM workshop. Research needs to be done to see the factors that influence customer interest in choosing a workshop. Performing regular service requires equipment. Tools that are often overlooked are special tools. If the workshop does not have special tools, the mechanics will have difficulty in the process of dismantling and installing or adjusting, so that the impact on the performance of the motorcycle that has been serviced. Research on the effect of the completeness of special tools during regular service at two official Honda workshops (HCM & CPM) in Padang on customer satisfaction has been successfully carried out and the results show a significant difference. The measurement of the influence of special tools on customer satisfaction is measured using the SERVQUAL method, so that service quality in both workshops can be seen. The SERVQUAL method uses several dimensions (tangible, reliability, responsiveness, assurance, empathy) which will then be translated into 16 variables as indicators to create programs that can control services oriented to customer satisfaction. The results showed that both workshops (HCM and CPM) had a gap between perception and expectations in each dimension. The average total gap for each dimension is -0.44486 for the HCM workshop and -0.2902 for the CPM workshop. This shows that the quality of service expected by customers has not yet been achieved in both workshops, but the quality of service from CPM workshops is much better compared to HCM workshops. This causes more CPM workshop customers compared to HCM repair shops.
Sebuah Solusi Pada Engine Berkompresi Rendah Agar Sesuai dengan BBM Non Subsidi Rosa, Yazmendra; Wahyu, Dian
ROTASI Vol 23, No 2 (2021): VOLUME 23, NOMOR 2, APRIL 2021
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.23.2.1-9

Abstract

Penggunaan sepeda motor lama/jadul di Indonesia saat ini masih tinggi. Adanya kebijakan pengurangan BBM bersubsidi oleh pemerintah menciptakan masalah baru, salah satunya berdampak pada engine-engine yang memiliki kompresi rendah. Penggunaan pertalite/premium pada motor jadul menyebabkan pembakaran yang kurang sempurna, sehingga mempersingkat usia pakai kendaraan.Penelitian ini bertujuan untuk mencari solusi permasalahan tersebut dengan cara menyesuaikan konfigurasi engine motor lama dengan karakteristik BBM pertalite/pertamax. Permasalahan ini dapat ditemukan dengan meneliti satu sampel motor lama yang memiliki kompresi 8,8: 1 dengan metoda 8 langkah troubleshooting yang diadobsi dari caterpillar.Hasil penelitian menunjukan bahwa peningkatan rasio kompresi dari 8,8: 1 menjadi 10,9: 1 dapat mempercepat proses cranking dari 36 detik menjadi 2 detik, dan penggunaan BBM tipe pertalite atau pertamax pada sepeda motor ini menjadi cocok dengan konfigurasi engine yang baru, hal ini berdampak pada konsumsi BBM yang lebih irit dari 52 km/l menjadi 76 km/l.
KAJIAN MODEL SISTEM SOLAR CHIMNEY UNTUK SISTEM PENGERINGAN BAHAN HASIL PERTANIAN PADA DAERAH JALUR KHATULISTIWA Yazmendra Rosa; Eka Sunitra; Dian Wahyu; Hanif Hanif
Jurnal Sains dan Teknologi Vol 16, No 2 (2017): Jurnal Sains dan Teknologi
Publisher : Fakultas Teknik Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (439.126 KB) | DOI: 10.31258/jst.v16.n2.p31-37

Abstract

Model Solar Chimney dengan ukuran 3x3 m2 luas atap rumah sebagai kolektor pelat datar telah dipelajari dalam penelitian ini. Udara panas keluaran sistem ini digunakan untuk pengeringan bahan hasil pertanian dengan sistem tray truck dryer telah dipelajari sebelumnya. Kedua sistem ini digabung untuk dijadikan terintegrasi pada daerah jalur khatulistiwa dimana membutuhkan pengeringan bahan hasil pertaniannya (contoh kulit manis, ikan, dll). Temperatur pengeringan bahan ini berkisar 41oC sampai dengan 80oC. Kondisi bahan ini dapat digunakan pada sistem pengeringan ini. Bahan yang dikeringkan berada pada temperatur pengeringannya akan menghasilkan jenis yang paling bagus dan maksimal, serta lebih bersih berada pada sistem tersebut.  Sistem ini menjadi alternatif pengeringan bahan pada daerah yang membutuhkan dijalur khatulistiwa yang masih belum memperoleh aliran listrik. Pemanfaatan energi surya secara langsung akan lebih optimal dalam kebutuhan sehari-hari masyarakat pada teknologi ini, sehingga ketergantungan dengan energi lain (minyak bumi, kayu, dll) berkurang dengan memanfaatkan sumber utama energi yaitu energi surya. Atap rumah sebagai kolektor pelat datar dan rumah pengering pada sistem solar chimney menjadi alaternatif energi untuk kebutuhan sehari-hari.
Fiat 4-Stroke Engine Performance Test With 1100 Cc Capacity Using Automotive Engine Test Bed T101d Dian Wahyu
Jurnal Teknik Mesin (JTM) Vol 9, No 2 (2019)
Publisher : LP2M - Institut Teknologi Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Engine is the main power in the vehicle and has a different performance. The differences in engine performance can occur due to different operating conditions and the fuel used. Therefore, research on the performance of combustion engines must be done to improve service to consumers, because not everyone can perform performance engine performance tests. At the time of planning the manufacture of the combustion engine, theoretical performance was calculated, but the results were different from the actual performance results on the dynamometer. Therefore an engine is tested for performance tests to get the characteristic value of the engine. The process of testing has been carried out in accordance with the Standard Operation Procedure in the relevant literature and concludes that the performance produced by the test machine shows the value of torque characteristics, the average effective pressure of the combustion chamber, fuel consumption and volumetric efficiency which is inversely proportional to the engine rotation speed . For the optimal variable engine operating conditions in this study were at 4000 Rpm with 72 Nm of torque and 30.1 Kw of power with a specific fuel consumption of 311.5 g / kWh
Experimental Study of Heat Pipe for Solar Collector Heater Dian Wahyu
Jurnal Teknik Mesin Vol 6 No 1 (2016): Jurnal Teknik Mesin Vol.6 No.1 April 2016
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2016.v6.i1.6-14

Abstract

Heat pipes with a size of 0.0127 m diameter x 1.3 m lenght x 0.0008 m thick and absorber with a size of 1m length x 0.1 m width has been created and tested to be used as a solar collector heating element. Heat pipes are made using water as the heat transport medium and using a stainless steel mesh wick 120 as a tool that helps accelerate the flow of condensate inside the heat pipe. Testing of heat pipes will be do in two condition at an inclination of 30o , before the heat pipes selected as the heating element in the solar collector. Testing of heat pipe on the first condition is done by using 1,000 ml of hot water temperature of 100oC with the power supply of 20 watts as a heat source in the evaporator side and further testing of pipe heat was tested by direct solar radiation, this test is intended to see directly if heat pipe was made able to work in conditions that are expected. Tests are done to see the heat transfer capacity and response speed (τ) of the heat pipe. Based on testing obtained the fastest response in the heat pipes transfer of the heat contained in the filling ratio of 20% with the heat transfer efficiency of 75%.
The Flat Type Heat Pipe Solar Collector: An Experimental Research Dian Wahyu
Jurnal Teknik Mesin Vol 6 No 2 (2016): Jurnal Teknik Mesin Vol.6 No.2 October 2016
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2016.v6.i2.55-62

Abstract

Flat solar collectors with heat pipe absorber with dimension of wide 1.5 m x 2 m lenght x 0.2 m thickness and 2.87 m2 aperture area has been tested to produce hot water. Heat pipe used in flat plate solar collector, has a filling ratio of 20% which has been proven to have the highest ability to transfer heat when tested in previous studies. Testing of solar collectors with heat pipe absorber has been done during the month of April 2016 in the city of Padang by using standard ASHRAE 93-2003. The test results showed the highest efficiency obtained was 46%. To get the hot water of at least 64 ° C with a flow rate of 0,35 L / min for 5 hours, required solar radiation of 750 W / m2. Generally, during the trial obtained water output temperature collectors from 8:00 - 9:00 pm and from 15: 30 - 17: 30 is below 60 ° C, whereas at 9:30 - 15: 30 obtained collector output water temperature above 64 ° C, while the water temperature reached at the highest collector output value of 78 ° C.
Fiat 4-Stroke Engine Performance Test with 1100 CC Capacity Using Automotive Engine Test Bed T101D Dian Wahyu
Jurnal Teknik Mesin Vol 9 No 2 (2019): Jurnal Teknik Mesin Vol.9 No.2 October 2019
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2019.v9.i2.74-83

Abstract

Engine is the main power in the vehicle and has a different performance. The differences in engine performance can occur due to different operating conditions and the fuel used. Therefore, research on the performance of combustion engines must be done to improve service to consumers, because not everyone can perform performance engine performance tests. At the time of planning the manufacture of the combustion engine, theoretical performance was calculated, but the results were different from the actual performance results on the dynamometer. Therefore an engine is tested for performance tests to get the characteristic value of the engine. The process of testing has been carried out in accordance with the Standard Operation Procedure in the relevant literature and concludes that the performance produced by the test machine shows the value of torque characteristics, the average effective pressure of the combustion chamber, fuel consumption and volumetric efficiency which is inversely proportional to the engine rotation speed . For the optimal variable engine operating conditions in this study were at 4000 Rpm with 72 Nm of torque and 30.1 kW of power with a specific fuel consumption of 311.5 g / kWh.