Dian Wahyu
Jurusan Teknik Mesin Politeknik Negeri Padang

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Experimental Study of Heat Pipe Solar Collector for Energy Supply to Heat Pump Wahyu, Dian
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Publisher : Kopertis Wilayah X

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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.
KAJIAN MODEL SISTEM SOLAR CHIMNEY UNTUK SISTEM PENGERINGAN BAHAN HASIL PERTANIAN PADA DAERAH JALUR KHATULISTIWA Rosa, Yazmendra; Sunitra, Eka; Wahyu, Dian; Hanif, Hanif
Jurnal Sains dan Teknologi Vol 16, No 2 (2017): Jurnal Sains dan Teknologi
Publisher : Fakultas Teknik Universitas Riau

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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.
The Flat Type Heat Pipe Solar Collector: An Experimental Research Wahyu, Dian
Jurnal Teknik Mesin (JTM) Vol 6, No 2 (2016)
Publisher : ITP Press - Institut Teknologi Padang

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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.
KAJIAN EKSPERIMENTAL ALATMULTI FUNGSI BERCATU DAYA TERMOELEKTRIKUNTUK PENDINGINAN DAN PEMANASAN Wahyu, Dian; Andriyanto, Andriyanto; Hanif, Hanif; Sukma, Rino; Rosa, Yazmendra
ROTOR 2016: ROTOR Special Edition
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

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The versatile tool from thermoelectric power supply has been made and has satisfied performance. The selection of material and tool is chosen based on the product availability in the market and the cooling device is selected based on the number of cooling load. Thermoelectric cooler is one of the electrical components that transfer a heat to another side by electric discharge. Cold temperature generated in the cold side is used to cooling the working fluid and the heat temperature is used to heating the water. The water is used as cooling fluid and used as much as 3L to cooling the room temperature where it is integrated by fan to either accelerate the heat absorption process or dispose the heat. Small heat exchanger is used to expand the heat absorption area in a cooling room. The results show that cooling element is capable to work constantly on the cooling power for one element by 37 W. Meanwhile in the tool characteristics, it is capable to produce low temperature of 13°C that begins in 40th minute. In addition, warm water temperature with volume of 30L is capable to produce 45°C. The maximum efficiency from cooling device is occurred when the different temperature in both side is nearly minimum. Coefficient of performance (COP) of cooling system is obtained at 0,58. Keywords: thermoelectric, cooling room system, COP (coefficient of performance)