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Jurnal Energi Dan Manufaktur
Published by Universitas Udayana
ISSN : 23025255     EISSN : 25415328     DOI : -
"Jurnal Energi dan Manufaktur" is a journal published by Department of Mechanical Engineering, University of Udayana, Bali since 2006. During 2006-2011 the journal's name was "Jurnal Ilmiah Teknik Mesin CAKRAM" (Scientific journal in mechanical engineering, CAKRAM). "Jurnal Energi dan Manufaktur" is released biannually on April and October, respectively. We invite authors to submit papers from experimental research, review work, analytical-theoretical study, applied study, and simulation, in related to mechanical engineering (energy, material, manufacturing, design) to be published through "Jurnal Energi dan Manufaktur".
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Articles 387 Documents
KAJIAN EKSPERIMENTAL PENGARUH TABUNG UDARA PADA HEAD TEKANAN POMPA HIDRAM Made Suarda; IKG Wirawan
Jurnal Energi Dan Manufaktur Vol 3, No.1 Juni 2008
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Pompa hidram bekerja berdasarkan prinsip palu-air. Ketika aliran fluida dihentikan secara tiba-tiba, maka perubahan momentum massa fluida tersebut akan meningkatkan tekanan secara tiba-tiba pula. Peningkatan tekanan ini digunakan untuk mengangkat sebagian fluida tersebut ke tempat yang lebih tinggi. Untuk itu, penelitian ini berusaha untuk mengetahui besarnya head tekanan akibat palu-air pada instalasi pompa hidram dengan dan tanpa tabung udara. Parameter yang diamati adalah besarnya peningkatan tekanan pada pipa penghantar, badan pompa, leher pompa, pipa penyalur serta debit yang dihasilkan pada bak limbah dan bak penampung. Dari hasil penelitian didapatkan bahwa head tekanan balik di dalam pipa penghantar menurun dari 103,87 m tanpa menggunakan tabung udara menjadi 37,85 m dengan tabung udara. Selanjutnya, dalam pipa penyalur head tekanan akibat water hammer meningkat dari 0,29 m tanpa menggunakan tabung udara menjadi 2,9 m dengan menggunakan tabung udara. Sehingga pemasangan tabung udara dapat meningkatkan efisiensi pompa hidram secara signifikan dari 0.72 % tanpa tabung menjadi 19,45 % dengan tabung udara.
Pengukuran Fluks Kalor Prosessor dengan Metode Simulasi Fluks Kalor Plat Datar Wayan Nata Septiadi; Nandy Putra; Engkos K; Raldi Artono Koestoer
Jurnal Energi Dan Manufaktur Vol 7 No 2 (2014): Oktober 2014
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Metode pengukuran dalam suatu penelitian di bidang perpindahan kalor khususnya pipakalor merupakan suatu hal yang sangat penting untuk bisa mendapatkan suatu data yangmemang akurat. Penelitian ini adalah untuk mendapatkan kondisi temperatur dan flukskalor pada permukaan plat pemanas yang mampu mewakili kondisi temperature dan flukskalor pada permukaan prosessor atau CPU. Penelitian ini meliputi tahap uji quasi steadystate, kalibrasi termokopel, pengukuran temperature permukaan CPU, karakterisasi platpemanan dan karakterisasi palt simulator. Dalam hal ini parameter yang dijadikan acuanpada plat simulator adalah temperature permukaan prosessor.Kata kunci: Pengukuran, Fluks kalor, ProsessorMeasurement methods in a research of the heat transfer especially the heat pipe is veryimportant to be able to get a really accurate data. This research is to obtain the conditions oftemperature and heat flux on the surface of the heating plate that capable of representingthe conditions of temperature and heat flux on the surface of the processor or CPU. Thisresearch includes the quasi steady state test phase, thermocouple calibration, CPU surfacetemperature measurement, characterization and characterization of heater plate andsimulator plate. In this case the parameters are used as reference in the simulator plate isthe surface temperature of processor..Keywords: Measurement, heat flux, processor
Pengaruh Air Fuel Ratio Terhadap Emisi Gas Buang Berbahan Bakar Lpg Pada Ruang Bakar Model Helle-Shaw Cell I Gusti Ngurah Putu Tenaya; Made Hardiana
Jurnal Energi Dan Manufaktur Vol 5, No.1 April 2011
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

The progress of developing science and technology are really influence to human life. Expansion of automotive astransportation and machine mover, can help human to do their activities easily. To get the machines move, is need much offuel from petroleum stock. But the stock of petroleum in world every day is very diminish and its unrenewable. Toanticipation and solve the problem about ability and dependence of society to use the fuel, is used gasses fuel such asliquified petroleum gas (LPG). The complete combustion are influence by three reason they are Air Fuel Ratio (AFR),homogeneity of mixture, and temperature of combustion. The complete combustion can be seen from content of exhaustemission. From the reason, researcher was did the research to know the influence of AFR toward the exhaust emission ofLPG fueled in the combustion chamber of Helle-Shaw Cell model.This experiment was did in the combustion chamber of Helle-Shaw Cell model with varieted the Air Fuel Ratio(AFR). The ratio is take from 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, and 21:1. The data that was observed are percentagesof carbon monoxide (CO), carbon dioxide (CO2), oxygen (O2) and hydrocarbon (HC).From result the research was get that the increasing of AFR from 14:1 to 20:1, the percentages of CO, O2, and HCare decrease but the percentages of CO2 is increase and in AFR 21:1 is occur decrease of CO2, while the percentage othergases are increase. To the LPG fuel stoichiometry of AFR is occur in 20:1. In stoichiometry of AFR the exhaust emission ofCO, O2, and HC are the most minimum but CO2 is the most maximum.
Kekuatan Tarik Komposit Matrik Polimer Berpenguat Serat Alam Bambu Gigantochloa Apus Jenis Anyaman Diamond Braid dan Plain Weave Sofyan Djamil; Sobron Y Lubis; Hartono Hartono
Jurnal Energi Dan Manufaktur Vol 7 No 1 (2014): April 2014
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Abstrak : Komposit merupakan suatu struktur material yang terdiri dari dua atau lebih konstituen yangdikombinasikan secara makroskopi, kombinasi tersebut tidak saling melarutkan. Matrikmenggunakan polymer dan reinforcement berupa fiber bahan alam bambu jenis gigantochloaapus dipotong berbentuk serat. Metode penelitian diawali dengan pembuatan cetakan(molding) dengan ukuran 500 x 500 x 20 mm, pemotongan bambu sebagai reinforcementberbentuk serat dengan ketebalan 1,5 mm, pembuatan anyaman tipe diamond braid dan plainweave, proses manufaktur bahan komposit dengan metode hand lay-up, ketebalan bahankomposit 4 mm, pembuatan spesimen dengan standar ASTM D3039 dengan sudut orientasi 0o,45o, 90o. Selanjutnya dilakukan proses pengujian tarik untuk mendapatkan nilai kekuatan tarikmaksimum (ultimate tensile strength). Nilai kekuatan tarik maksimum untuk spesimen diamondbraid sudut orientasi 0?: 1,963 N/mm2, 45?: 2,387 N/mm2 dan 90?: 2,253 N/mm2. Nilaikekuatan tarik maksimum untuk spesimen plain weave sudut orientasi 0?: 4,2 N/mm2, 45?:2,017 N/mm2 dan 90?: 4,2 N/mm2.Kata kunci: gigantochloa apus, diamond braid, plain weave, hand lay-up, ultimate tensilestreng.Abstract : Composite is a structure consisting of two or more constituents which combinedmacroscopically. The combination is not mutually dissolve. Using a polymer as a matrix andfiber reinforcement material in the form of natural bamboo Gigantochloa apus of fiber-shapedcut. The research method begins with making the mold with a size of 500 x 500 x 20 mm.Cutting-shaped bamboo as reinforcement fibers with a thickness of 1.5 mm, the manufacture ofwoven braid-type diamond and plain weave, the manufacturing process of composite materialsby hand lay-up method, the thickness of 4 mm of composite materials, the manufacture of thespecimen with ASTM D3039 at an angle variation of 0° orientation, 45o, 90o. Tensile testingprocess is then performed to obtain the maximum value of the tensile strength (ultimate tensilestrength). The maximum tensile strength values for diamond braid specimen : 2.253 N?: 2,387 N/ mm2 and 90?: 1.963 N / mm2, 45?orientation angle 0 / mm2. The maximum tensile strengthvalues for plain weave specimen orientation : 4.2 N / mm2.?: 2,017 N / mm2 and 90?: 4.2 N /mm2, 45?angle 0Keywords : gigantochloa apus, diamond braid, plain weave, hand lay-up, ultimate tensilestrength
Analisa Performansi Sistem Air Conditioning Mobil tipe ET 450 dengan Variasi Tekanan Kerja Kompresor Adi Purnawan; Suarnadwipa -; I K.G. Wirawan
Jurnal Energi Dan Manufaktur Vol 4, No.1 April 2010
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Comfort and coolness when traveling by vehicle especially car is highly needed. So many attempts have been made byhumans that comfortable traveling by car can be achieved. One of the effective ways in which comfortable traveling by car can beobtained is by installing air conditioning. The performance of air conditioning system is highly influenced by how the compressorworks. In other words, the pressure resulting from the suction highly determines the performance of air conditioning system,which then affects how the compressor works, the compressor power, the refrigeration effect, the efficiency of isentropic andcoefficient of performance (COP) of the car air conditioning sytem especially that of the car air conditioner type ET 450. Fromwhat has been described above, the writer would like to conduct a research entiled “ Analysis of the Performance of the Car AirConditioning system Type ET 450 with Variation of the Compressor Pressure”.The test was conducted on the car air conditioner type ET 450 with variations of suction 2.8 bar, 3 bar, 3.2 bar, 3.4bar, 3.6 bar and 3.8 bar. The data were obtained from the pressure of compressor output (P2), the temperatures in each point areT1, T2, T3, T4, the compressor rotationn is n, the strength of electrical current is I, and the volumetric flow rate. The data werethen processed and analyzed so that so that the performance of each variation of the suction could be actually and theoreticallyobtained.The findings show that the bigger the suction, the bigger the performance of the car air conditioner type ET 450 wouldbe. The theoretical coefficient of performance (COP) produced was bigger than the actual COP. The optimal COP took placewhen the suction was 441.325 kPa, the actual COP was 3.513177 and the theoretical COP was 3.632062
Pengaruh Perlakuan Temperatur dan Waktu Penahanan Pack Carburizing Terhadap Umur Lelah Baja St 42 Ketut Suarsana; Cok Istri Putri K; I Made Astika
Jurnal Energi Dan Manufaktur Vol 11 No 1 (2018): Published in April 2018
Publisher : Department of Mechanical Engineering, University of Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (452.315 KB) | DOI: 10.24843/JEM.2018.v11.i01.p05

Abstract

Pack carburizing merupakan suatu proses laku panas untuk memperoleh pengerasan hanya pada bagian permukaan dengan menggunakan media carburizer padat. Dengan memberikan temperatur pemanasan dan waktu penahanan yang tepat diharapkan dapat meningkatkan umur lelah suatu material baja St.42. Metode pada penelitian ini mengunakan pack carburizing padat berupa serbuk, yang dibuat dalam bentuk kotak dan didalamnya diisi serbuk carbon. Penelitian ini membahas tentang pengaruh waktu penahanan dan temperatur pack carburizing terhadap umur lelah baja ST 42 dengan menggunakan variasi temperatur pemanasan adalah : 850, 900 dan 950°C dan waktu penahanan 4, 6 dan 8 jam. Kedua variabel ini diamati pengaruhnya terhadap umur lelah. Berdasarkan hasil penelitian bahwa waktu penahanan dan temperatur pack carburizing berpengaruh nyata terhadap umur lelah, dimana umur lelah tertinggi yaitu pada 993.089 cycle pada temperatur pemanasan 950 °C dan waktu penahanan 8 jam. Umur lelah paling rendah adalah 440.613 cycle terjadi pada temperatur pemanasan 850 °C dan waktu penahanan 4 jam. Pack carburizing is a hot-selling process to obtain only hardening on the surface by using solid carburizer media. Providing proper heating temperature and retention time is expected to increase the fatigue life of a steel material of St.42. The method in this study using a solid pack carburizing of powder, which is made in the form of a box and inside it is filled with carbon powder. This study discusses the effect of detention time and pack carburizing temperature on ST 42 fat age by using variation of heating temperature are: 850, 900 and 950?C and holding time 4, 6 and 8 hours. Both of these variables were observed to influence the fatigue life. Based on the result of research that the holding time and temperature of pack carburizing have a significant effect on fatigue life, where the highest fatigue age is 993,089 cycles at heating temperature 950 ?C and 8 hours of detention time. The lowest fatigue period was 440,613 cycles occurring at a heating temperature of 850 ?C and a 4 hour detention time.
Perilaku Nonlinier Pipa Elbow Bertekanan dengan Beban Termal dan In-Plane Bending Nurcahya Nugraha; Asnawi Lubis; Ahmad Su’udi
Jurnal Energi Dan Manufaktur Vol 12 No 2 (2019)
Publisher : Department of Mechanical Engineering, University of Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (377.704 KB) | DOI: 10.24843/JEM.2019.v12.i02.p06

Abstract

Pipa elbow adalah komponen yang penting pada sistem perpipaan. Pipa elbow memiliki fleksibilitas yang baik, sehingga dapat mengurangi tegangan akibat ekspansi termal. Beban yang diterima oleh pipa elbow adalah beban bending, beban termal dan tekanan internal. Beban bending menyebabkan ovalisasi pada pipa elbow. Jika tekanan internal ditambahkan, maka tekanan internal akan cenderung bertindak melawan efek yang disebabkan oleh beban bending dan menunjukkan perilaku nonlinear. Beban in-plane bending dan tekanan internal yang bekerja secara bersamaan pada ping elbow tidak menunjukkan perilaku nonlinier. Pada kondisi aktual, beban yang diterima oleh pipa elbow adalah beban termal yang memberikan efek cenderung sama seperti beban in-plane bending. Pada penelitian ini dilakukan analisis untuk menilai perilaku nonlinier pipa elbow yang diberikan beban termal dan tekanan internal dibandingkan dengan beban in-plane bending dan tekanan internal. Pada penelitian ini digunakan metode elemen hingga (ANSYS Mechanical APDL). Material yang dipakai adalah titanium alloy (Ti-6Al-4V) dan diasumsikan bersifat elastic-perfectly plastic. Hasil penelitian menunjukkan bahwa perilaku nonlinier hanya terjadi pada pembebanan in-plane bending dan tekanan internal. Sedangkan pada pembebanan termal dan tekanan internal tidak terjadi perilaku nonlinier. Pada pembebanan termal, tekanan internal memberikan efek yang searah dengan perpindahan yang disebabkan oleh beban termal. Pada pembebanan in-plane bending, tekanan internal memberikan efek yang berlawanan dengan perpindahan yang disebabkan oleh beban in-plane bending. Tegangan akibat beban in-plane bending lebih besar dibandingkan beban termal. Tekanan internal meningkatkan tegangan yang disebabkan pembebanan termal dan mengurangi tegangan yang disebabkan pembebanan in-plane bending
Assessment Performance of Pumps as Hydro-Turbines Made Suarda
Jurnal Energi Dan Manufaktur Vol 3, No.1 April 2009
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

The basic principle work of hydro-turbines are reversal of pumps, therefore, an alternative solution that can be developed inovercoming problem to get hydro turbines are by using pumps, by flowing water in the reverse direction through in thepumps, as hydro turbines. Those are supported by availability of pumps widely in the market and have been mass-producedhence they were relatively cheap. The aims of this research are to determine performances of pumps as turbines - reversepumps. This experiment assesses performance of two small pumps that are centrifugal ‘diffuser-pump’ and ‘volute-pump’ ashydro turbines with various debit and head of water flow resource, such as output-powers and their efficiencies. The resultsshow that the centrifugal diffuser-pump as hydro turbine performs maximum efficiency about 20,6%, where is as pump fromits brochure suppose 47%. In the other hand, the centrifugal volute-pump as turbine achieves maximum efficiency about32%, where is expected 26% as pump from its brochure. Both type of the pumps present that the maximum efficiency asturbines performed at head of water flow resource through the pumps as high as their maximum characteristic head of thepumps. Furthermore, both pumps as turbines generate high shaft revolution that was about 1.500 rpm at their maximumefficiency. Although those efficiencies are considerably low to an ideal efficiency 100%, however, the volute-pump as turbineperforms a reasonably efficiency (32%) that higher than (at least is same as) the efficiency of its pump characteristic (26%),and this pump available very widely in the market. Should be pointed out that bigger dimension pumps propose higherefficiency up to about 86%, therefore they are expected to give higher efficiency as well. So, centrifugal volute-pumps arepotential alternative solution to be used as hydro turbines.
Pengaruh Thermal Shock Terhadap Kekuatan Tarik dan Bending KompositResinBerpenguat Serat Rami Rozi Saferi; Hendery Dahlan; Mulyadi Bur Mulyadi Bur
Jurnal Energi Dan Manufaktur Vol 8 No 2 (2015): Oktober 2015
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Abstrak:Perkembanganteknologi komposit saat ini sudah mulai mengalami pergeseran, dari bahan komposit berpenguat serat sintesismenjadi bahan komposit berpenguat serat alam. Serat alam rami (Boehmeria Nivea) memiliki peluang untukdikembangkan sebagai media penguatan pada resin polimer. Tujuan dari penelitian ini untuk mengetahui perubahan kekuatan tarik dan bending kompositresinberpenguat serat ramiakibat pengaruh lingkungan. Dalam penelitian ini digunakan serat ramipintalan dengan diameter 1.5 mm yang ditenun manual dan matriks polyester jenis resin bening.. Fraksi volume serat dan resin yang digunakan9% dan 91%.Tenunan serat divariasikan baik dengan perlakuan NaOH 20% maupun tanpa perlakuan alkali. Komposit dipanaskan di dalam oven listrik pada temperatur 1000C selama 1 jam, kemudian dilakukan pendinginan dengan merendam komposit pada ????????2???????? dengan variasi siklus thermal shock 5, 10, 15, dan 20. Spesimen uji tarik dan uji bending dibuat berdasarkan ASTM D638 dan ASTM D790-03.Hasil penelitian menunjukkan Kekuatan tarik dari komposit resin berpenguat serat rami dengan perlakuan NaOH 20% rata-rata turun 25,66 % dari kekuatan tarik maksimum sebesar 38.4 MPa dan turun 24.51% dari kekuatan tarik maksimum sebesar 29.08 MPa untuk serat tanpa perlakuan NaOH akibat perlakuan thermal shock. Kekuatan bending dari komposit resin berpenguat serat rami dengan perlakuan NaOH mengalami penurunan rata-rata 14.14 % dari kekuatan bending maksimum sebesar 75.08 MPa dan mengalami penurunan 17.34% dari kekuatan bending maksimum sebesar 49.57 MPa untuk serat tanpa perlakuan NaOH akibat pengaruh thermal shock.Bentuk patahan spesimen komposit setelah diberikan perlakuan thermal shock menunjukkan semakin getasnya stuktur dari komposit dan semakin rapuhnya serat rami baik dengan maupun tanpa perlakuan NaOH Kata Kunci: Komposit, rami, thermal shock, sifat mekanik.Abstract:The recent composite technology has changed from synthetic to natural fibre-reinforced composite. Natural fibre Boehmeria Nivea (rami) is one of the promising reinforced medium to polymer resin. The objective of the present work is to investigate the tensile and bending strengths of the boehmeria nivea fibre-reinforced resin composite. The present research used a 1.5 mm diameter of woven boehmeria nivea fibre and a transparent resin of polyester matrix. The volume fraction of the fibre and resin were 9% and 91%, respectively. The woven fibre was varied with 20% NaOH and without alkali treatment. The composite was heated in electrical oven at 1000 oC during 1 hour, and then cooled by immersing the composite in the water at various cycle of thermal shock 5, 10, 15, and 20, respectively. The specimen for tensile and bending test was made according to ASTM D638 and ASTM D790-03. The results showed that the tensile strength of the boehmeria nivea fibre-reinforced composite with NaOH 20% treatment decreased 25,66% by average from the maximum tensile strength 38.4 MPa. Meanwhile the tensile strength that of without NaOH treatment decreased 24,51% from the maximum tensile strength 75,08 MPa. Those of bending strength of the tested composite also decreased 14,14% from the maximum value 75,08 MPa; and decreased 17,34% from the maximum bending strength 49,57 MPa, respectively. The fracture shape of the specimen showed both the brittle structure of the composite and the fragile fibre on both with and without treatment. KeyWords: Composite, rami, thermal shock, mechanical properties
Analisa kinerja sistempendingin peltier yang menggunakan sel PVdengan sumber energi radiasi matahari Terang UHSG; Zulkifli Lubis; Tulus Burhanuddin Sitorus
Jurnal Energi Dan Manufaktur Vol 9 No 2 (2016): Oktober 2016
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Abstrak:Pemanfaatan energi surya secara umum digunakan untuk energi termal dan energi listrik. Salah satu aplikasi dari sistempemanfaatan untuk energi listrik adalah penggunaan fotovoltaik (PV). Tujuan penelitian ini adalah untuk mengetahui kinerjasistem kerja kotak pendingin dengan bantuan sel PV yang menyerap sumber energi matahari. Kelebihan dari dari sistempendinginan ini adalah beroperasi tanpa menggunakan energi listrik serta ramah lingkungan. Penelitian ini menggunakankomponen elektronik peltier untuk pendingin. Komponen peltier dirangkai dengan heat sink dan kipas kecil diletakkan di bagianluar dan kipas yang lain diletakkan di bagian dalam kotak pendingin. Kotak pendingin terbuat dari styrofoam. Data perubahantemperatur sistem kotak pendingin yang diperoleh kemudian dianalisa sehingga dapat diperoleh kinerja sistem kotak pendingintersebut. Pengujian dilakukan di ruangan terbuka yang mengalami paparan radiasi matahari. Proses pengukuran parametercuaca dilakukan dengan menggunakan alat ukur cuaca HOBO dan untuk merekam perubahan temperatur pada setiapkomponen sistem pendingin peltier digunakan data akuisisi. Hasil penelitian menunjukkan bahwa nilai COP maksimum sistempendingin peltier yang dapat dicapai adalah 0,317. Pada penelitian ini, juga diteliti pengaruh kondisi cuaca yang meliputi radiasimatahari, temperatur dan kelembaban udara terhadap kinerja sistem pendingin peltier.Kata kunci: sistem pendingin peltier, kinerjaAbstract:The utilization of solar energy consist of thermal energy and electrical energy. One application of the system for the utilization ofelectrical energy was photovoltaic (PV). The purpose of this study is to determine the performance of cooler box with PV cellsthat absorb the solar energy. The advantages of this cooling system was operated without using the electrical energy andenvironmentally friendly. This study uses electronic components Peltier for cooling. The peltier component assembled with a heatsink. The small fan that was placed on the outside and the other fan was placed inside the cooler. The cooler system was madeof styrofoam. The changing of temperature in the cooler system was analyzed and obtained the performance of the cooling boxsystem. The experiments were carried out in open space which exposure to solar radiation. The HOBO station was used tomeasure the weather parameter. To record the changing of temperature in the components was used data acquisition. Theresults showed that the maximum COP of peltier cooling system that can be achieved was 0.317. In this research, also wasstudied the effect of weather conditions against the performance of peltier cooling system.Keywords: peltier cooling system, performance