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Jakarta, Indonesia

Abdullah K.,Darma Persada University
IMETI 2011 - 4th International Multi-Conference on Engineering and Technological Innovation, Proceedings | Year: 2011

One of the effort to solve poverty problem, starting 2007, the government of Indonesia has launched a national Energy Self Sufficient Village (ESSV) program aiming, create the spirit of self help for villagers so that they are capable to fulfil their own basic energy needs for cooking, lighting, and to improve their wellbeing by cleverly utilizing locally available renewable energy sources to generate economic activities. By 2010 there were already more than 630 ESSVs have been established throughout the country. Each ESSV establishment has required between IDR 400 million (US$ 47, 000) to IDR 1, 2 billion (US$141, 000) for each ESSV depending of types of renewable energy sources available in the village. The program however, needs continuous long term monitoring and evaluation using university program to ensure it sustainability. The paper describes how Darma Persada University could help mitigating the current problems faced in implementing the ESSV program.

Hendroko R.,Darma Persada University | Wahyudi A.,University of Muhammadiyah Malang | Wahono S.K.,Indonesian Institute of Sciences | Praptiningsih G.A.,University of Indonesia | And 2 more authors.
International Journal of Technology | Year: 2013

One of the cultivation failure reasons of Jatropha curcas Linn (JcL) in Indonesia was that it was only recommended for Crude Jatropha Oil (CJO) production which is processed into biodiesel. CJO is only 17-25% of dry seed weight, while the waste residue is called seed cake. Another waste product is dried capsule husk (DH-JcL) which is about 30-80% of the fresh fruit weight and sludge CJO (S-CJO) or about 2-5% of the CJO. S-CJO was unutilized which is bad for the ecology when it is disposed. The research objective was the utilization of the S-CJO waste for bio-refinery and improvement productivity of biogas made from DH-JcL.The study was conducted at the research garden of PT Bumimas Ekapersada, Bekasi, West Java in November-December 2012. A liter one-stage digester was compiled completely as a randomized design (CRD) with three replications in a water bath at a temperature of 32°C. The materials used were DH-JcL of JatroMas cultivars in the toxic category which were mixed with the sludge S-CJO as a co-substrate about with 10% water at a ratio of 1:8. Observation variables were biogas production volume (water displacement method), pH and temperature in the outlet slurry. The preliminary study concludes that S-CJO is appropriate as the co-substrate DH-JcL. It can increase the biogas productivity with feed in less than 10% of S-CJO allocation per day. ©IJTech 2013.

Marlinda,Tokyo University of Agriculture and Technology | Uyun A.S.,Darma Persada University | Miyazaki T.,Tokyo University of Agriculture and Technology | Ueda Y.,Tokyo University of Agriculture and Technology | Akisawa A.,Tokyo University of Agriculture and Technology
Energies | Year: 2010

A numerical investigation of the double-effect adsorption refrigeration cycle is examined in this manuscript. The proposed cycle is based on the cascading adsorption cycle, where condensation heat that is produced in the top cycle is utilized as the driving heat source for the bottom cycle. The results show that the double-effect cycle produces a higher coefficient of performance (COP) as compared to that of the conventional single-stage cycle for driving temperatures between 100 °C and 150 °C in which the average cycle chilled water temperature is fixed at 9 °C. Moreover, the COP of the double-effect cycle is more than twice that of the single-stage cycle when the temperature reaches 130 °C. It is also observed that the adsorbent mass ratio of the high temperature cycle (HTC) to the low temperature cycle (LTC) affects the performance of the double-effect adsorption refrigeration cycle. © 2010 by the authors.

Tambunan A.H.,Bogor Agricultural University | Manalu L.P.,Bogor Agricultural University | Abdullah K.,Darma Persada University
Drying Technology | Year: 2010

Exergy analysis is considered as an effective tool and has been widely used for assessing energy status of a thermal process from thermodynamic point of view. In this article, the exergy analysis is applied to the assessment of sensible thermal storage for a solar drying system. The objective of this study is to evaluate the role of the heat transfer process to the simultaneous exergy charging and discharging of the storage system in relation to the solar drying system. The results show that exergy loss ratio, which was regarded as the fraction of transferred exergy to the drying chamber, varied with the charging time and reached a minimum value at a certain charging time. The minimum exergy loss ratio and the time to reach the value are strongly dependent on the number of transfer units (NTU). The ratio of exergy loss at NTU¬sim;0 was 86%, greater than the value of practical interest. Accordingly, the application of sensible heat storage for a solar drying system will exert only a small effect to the temperature of the drying air entering the drying chamber. © 2010 Taylor & Francis Group, LLC.

Siswantara A.I.,University of Indonesia | Daryus A.,University of Indonesia | Daryus A.,Darma Persada University | Darmawan S.,University of Indonesia | And 3 more authors.
International Journal of Technology | Year: 2016

This study uses biogas, an environmentally friendly renewable energy resource, to operate the prototype of a micro-gas turbine (MGT) system called the Proto X-3 Bioenergy Micro-gas Turbine, designed for green building application. The biogas is produced by an anaerobic digester. The aim of this research is to simulate slurry flow in an anaerobic digester as the basis for developing a biogas digester that will produce biogas to meet the requirements of the Proto X-3 Bioenergy Micro-gas Turbine. The digester is a rectangular type with 3.4 m3 capacity. The flow calculations and simulations were done using Computational Fluid Dynamics (CFD) methods in two-dimensional, body-fitted coordinate mesh. The simulations were conducted with various baffle clearances for the digester: 50 mm, 100 mm, and 150 mm. The CFD simulations showed that the recirculation phenomena was found in all flows but that the 50-mm baffle clearance model had the largest recirculation, and it would lead to better mixing of the slurry. © IJTech 2016.

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