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PENGARUH VARIASI BEBAN PENDINGIN TERHADAP PRESTASI KERJA MESIN PENDINGIN DENGAN REFRIGERAN R12 DAN LPG
Get PDFIn this research discusses the influence of the cooling load variations on job performance refrigeration includes refrigeration capacity, coefficient of performance and cooling time, the compressor, the impact of refrigeration and compression work with refrigerants R12 and LPG. This study uses a variation of the load is light 20watt, 40Watt, 60Watt, and 80watt at the time of the study for 30 minutes for each of the cooling load, the file retrieval is done use the cooling machine refrigerator sanyo type with dimensions of 90 cm x 45 cm x 45 cm. The results showed the optimum value of COP (coeficient of Performance) of the fridge that I use on the refrigerant R12 and LPG with a load of 40 watts and 30 minutes was 4.75 for R12 and 5.00 for LPG,Obtained that use LPG refrigerant temperature produced less than R12 at the same time that is 30 minutes, the temperature on LPG without cooling load is 10 oC, the load is 11 oC 20 watt, 40 watt load by 12 oC, 60 watt load of 15 oC, and for a load of 80 watts by 17 oC and R12 produced no load temperature is 12 oC, 20 watt load as big as 13 oC, 40 oC as a 15 watt, 60 watt load of 16 oC, and for a load of 80 watts of 18 oC it is seen that the use of LPG refrigerants better because it has a pretty good engine performance compared to R12 views of COP obtained from the same load. Key word: Cooling load ,COP, LPG, refrigeran
Analisis Kekuatan Tarik dan Kekasaran Kawat Tembaga Hasil Drawing akibat Variasi Persentase Reduksi
Get PDFWire drawing is cold working process to reduce the cross-sectional area. The value of reduction is different in every process, depend on the needs and working parameters. The degree of reduction causes differences of copper wire rod in the characteristics and quality, such as its tensile strength and roughness. The purpose of this research is to determine the influence degree of reduction to the tensile strength and roughness of copper wire. The research method is comparing the tensile strength and roughness of copper wires control with drawed copper wires, without repetition stage. The speciments used in this research are pure copper rods (99.9%) with 3.1 mm, 3.2 mm and 3.25 mm in diameter and 2.8 mm of die output, so will get the degree of reductions are 19%, 23% and 26%. The results of this research was the wire drawing process increase the tensile strength of copper rods from 86.87 MPa to 100.74 MPa on 19% reduction. On 23% reduction the tensile strength increase from 82.24 MPa to 105.62 MPa. The greatest increase of tensile strength was result by 26% reduction, it was from 86.87 MPa to 115.36 MPa With the more of degree of reduction on the drawing process led the increase of tensile strength will be greater. This research also obtained the result that the wire drawing process result the decrease roughness of copper rods from 0,144 μm to 0,089 μm on 19% reduction, from 0.146 μm to 0.087 μm on 23% reduction and the copper rod roughness decrease from 0.159 μm to 0.083 μm on 26% reduction. The increase of degree of reduction produce insignificantly result of surface roughness changing. Keywords: Roughness, Tensile Strength, Wire Drawing, Reduction, Coppe
Rancang Bangun Poltekom Electric Car Sebagai Modul Pembelajaran Teknik Mekatronika
Get PDFPOLTEKOM Electric Car  is one of POLTEKOM effort to help the government programs in the development of electric cars . Many problems of electric cars for example in high cost and difficulties to finding spare parts into several constraints of the college to make an electric car . For this study researcher tried to designed and built an cheap electric cars which is capable of being used for transportation vehicle, both for moving people and goods with a certain capacity . To prove the target of this research purpose, we perform the strength of the chassis test , acceleration test , braking test and climbs test . By the testing, it is known that POLTEKOM Electric Car  Able to move the maximum load of 200kg . Capable of driving a maximum of 35km/jam on flat road . Being able to climb the terrain with a slope of 15 degrees and is able to ride off after braking at a distance of 1 meter . By the datas that we collect during the test, it was analised and concluded that POLTEKOM Electric Car  has been able to be used as human and material handling which can then be used as a learning module in mechatronic engineering . Keywords: electric car, material and human handlin
ANALISIS PENGARUH VARIASI GRADE BIOETANOL TERHADAP DISTRIBUSI TEMPERATUR NYALA API DAN UNJUK KERJA PADA KOMPOR BIOETANOL TANPA SUMBU TIPE TOP BURNER
Get PDFTop burner cotton less bioethanol stove is one of the appliances that apply the use of renewable fuels for domestic capacity. Application of this stove burner is a solution for scarcity of fossil fuel supplies. This study focused on variations in the distribution of flame temperature and performance on the top burner as grade of bioethanol varies at value of 55%, 70%, 85%, and 97%. Flame temperature distribution measured at of their hot spots and then simulated using Matlab R2011a to obtain isothermal contour flame shape and determine the flame temperature distribution of the flame. Performance testing used Standard International Water Boiling Test version 4.1.2 to determine the power, thermal efficiency, specific fuel consumption, and heat transfer. Results obtained that the flame temperature distribution, in the form of profiles and contours isothermal flame, reached its optimum when using bioethanol grade of 97%. Optimal performance on a stove burner using bioethanol 97% with power stove equal to 1.85 kW, the thermal efficiency of 72.21%, specific fuel consumption (Sfc) 0.512 kgbb/kguap, and heat transfer at value of 2,959 kW was also achieved at the same grade. The higher grade bioethanol used to increase the flame temperature distribution and performance of the stove. Keywords: Bioethanol, Stove, Temperature Distribution, Performanc
PENGARUH MICROEXPLOSION TERHADAP KARAKTERISTIK PEMBAKARAN BAHAN BAKAR MINYAK JARAK PAGAR (JATHROPA CURCAS L.) PADA BERBAGAI DIAMETER DROPLET
Get PDFInsights to develop alternative energy sources comes as the depletion of fossil fuel reserves . One is the use of Jatropha or Jatropha curcas Linnaeus . Plants that can be grown on degraded land and does not require much water and fertilizer proved to be extremely effective if the fruit or seeds developed into biodiesel as an alternative energy to replace diesel oil, fuel oil , even kerosene. Jatropha oil has properties that approach the characteristics of liquid fuel especially diesel oil . This prompted the researchers conducted a study of castor oil to find alternative fuels as a substitute for petroleum. In this study the method used is a true experimental research , by comparing one or more test groups with treatment and without treatment . This study uses a variation of the independent variable droplet diameter to the size of 1.75 mm, 1.88 mm , and 1.98 mm . Dependent variable is the temperature of combustion , burning time , the sound frequency fluctuations and flame visualization The results showed that the larger the droplet diameter greater likelihood microexplosion . From observation of the flame burning with microexplosion found that the larger the droplet diameter , the height and width of the flame will tend to increase. Microexplosion make a bigger flame. Burning castor oil to produce ignition delay time microexplosion sooner. Microexplosion castor oil combustion also generates burning with a good rate . It is approaching the character of diesel oil , the ignition delay time is fast but the diesel combustion temperature is lower than pure castor oil. Keywords : microexplosion, burning rate, castor oi
PENGARUH VARIASI JENIS CAIRAN PENUKAR PANAS TERHADAP KINERJA PEMANAS AIR TENAGA SURYA SISTEM PELAT DATAR YANG MENGGUNAKAN PRINSIP SIRKULASI PAKSA
Get PDFSolar water heater is a device that heats water using solar collectors as heat sink of radiation heat, which is forwarded to the pipe containing the fluid heat exchanger (heat exchanger). In this study, conducted comparative testing of solar water heating performance between the performance of the water heater that uses liquid water heat exchanger, airgaram 3.5%, and palm oil. Data collection was performed by taking the data every 30 minutes for 3 hours is at 9:00 to 12:00 pm and the test done 3 times on different days with variations in the type of fluid heat exchanger. From the study data taken include temperature liquid heat exchanger in and out the collector, and the water temperature in the tank, which is then carried out data processing to determine the mass flow rate, density of the fluid, temperature differences in the liquid heat exchanger incoming and outgoing collector (AT) , the performance of solar water heaters (q), and processing the data graphically. The results of the research of some kind of liquid water heat exchanger, brine 3.5%, and palm oil showed that liquid palm oil heat exchanger with a heat capacity of 1,866 kJ / kg. K and a boiling point of 175 0C is the greatest performance, the performance of the lowest value owned by the water. This is due to the value of palm oil heat capacity smaller than a heat capacity of water and greater than the capacity of brine 3.5%, but it is also influenced by the boiling point of palm oil is the highest of any other heat exchanger fluid. Key Words: Heat exchanger, heat capacity, performance, collector, boiling point
PENGARUH VARIASI DURASI CAMSHAFT TERHADAP UNJUK KERJA MOTOR BAKAR 4 LANGKAH
Get PDFTo obtain maximum engine performance one way to do is to do modification the camshaft . Changes can be made to alter or modify the time to open and close the valve. As already unknow that big power generated by the engine is affected by the amount of residual gases that exit the combustion chamber. The amount of air and fuel mixture entering the combustion gases and regulated by the duration of the opening and closing of the valve.For it was necessary to study the extent to which the effect of the change by the duration of the camshaft to the increased power and torque of the engine, which can then be recovered size is definitely the most appropriate duration to generate great power and torque. Effective power produced at 220 ° camshaft duration variation is at 6000 RPM of 7.7 HP, variations in camshaft duration 227 °, ie at 8.49 HP at 6500 RPM, variations in camshaft duration 233 °, ie at 6500 RPM at 8.77 HP, variations in camshaft duration 239 °, ie at 9.53 HP at 6500 RPM. Average turning moment - resulting in maximum average variation of camshaft duration 220 °, ie at 6000 RPM of 1.37 Nm Variations camshaft duration 227 °, ie at 6000 RPM 1.43 Nm Variations camshaft duration 233 °, ie at 1.47 Nm at 6000 RPM Variations camshaft duration 239 °, ie at 6500 RPM of 1.51 Nm Keywords: effect of variations in the duration of the camshaft, power, torque, and fc (fuel concumtion)
PENINGKATAN KUALITAS PRODUK UKM KURSI LIPAT DENGAN METODE INTERNAL PRESSURE DAN RANCANG BANGUN MESIN BENDING KONVENSIONAL
Get PDFProduct with quality obtained from existence of good forming process. Ovality one of deviation which is because of process bending. Process bending donewithout and internal pressure. Internal pressure used: 100, 200, 250 and 300 bar. Equipments used in course of bending consisted of the hydraulic pump, pressure gauge, regulator / valve, T Fitting, Oli SAE 40 and Nivle Pipe ( NPT).For that require to be a research to analyse the hydraulic pressure influence to ovality process of bending of pipe of circular of raw material camp chair. Research done to designed experiment with the diameter tube 16, 19.05 and 25.4 mm. Its result hydraulic pressure yielding ovality minimum is for the D of tube 16 mm equal to 300 bar while for the D of tube 19.05 and 25.4 equal to 250 bar. Keywords: bending process, ovality and hydraulic pressure
RANCANG BANGUN FLEXY BIKE SEBAGAI ALAT TRANSPORTASI ALTERNATIF KELUARGA INDONESIA
Get PDFBicycle (human powered vehicles) is very popular transportation appliance in society, with all excess and its insuffiency. Design bicycle specially form and its size measure adapted for ergonomi of body human being with the certain age, its meaning minibike just to children, while big bicycle just to adult or child with the high body. So that is not rarely met, at one particular family own some bicycle type, as according to its wearer. as a result required a broader place many for the menyimpan of bicycle. This matter enough become the big problem in cities, where farm for the house of progressively narrow. To finish the problem, this research designed and made by a bicycle which can be used by all age (except baby), the bicycle Flexy Bike. Flexy Bike is bicycle having function fleksible. That is bicycle which can be functioned in so many form and size measure, without lessening security and its freshment. Others, Flexy Bike designed to can be folded, so that earn easily kept without requiring wide place. Keywords: bicycle, scheme, flexible and Flexy Bik
PENGARUH KECEPATAN RELATIF PERMUKAAN GESEK DAN TEMPERATUR TERHADAP KOEFISIEN GESEK BLOK REM KOMPOSIT KERETA API
Get PDFBraking system is an important thing on safety of the train. In that process, kynetic energy changed into thermal energy that would be known by the increasing of temperature at the surface and around the area of contact between the wheels and brakes. From research before, the increasing of contact temperature would lead a thermal crack on the wheel. Failure could be occure by that crack. Based on that results, research on the phenomenon of rising temperatures due to friction between wheel and railwould be very needed. In this paper,the effect of temperature and relative velocity of the surface to coefficient of friction would be studied. Experimental study of this paper using pin on disc test with 2 kg load and relative velocity variated from 4,61 m/s(400 rpm); 5,76 m/s(500 rpm) and 6,91 m/s(600 rpm).Results of this research shows that increasing temperature and relative velocity would lead an increasing of friction coefficient. Key word: brake, composite, temperature, friction coefficient, relative velocit