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Padang, Indonesia

Fudholi A.,National University of Malaysia | Sopian K.,National University of Malaysia | Gabbasa M.,National University of Malaysia | Bakhtyar B.,Northern University of Malaysia | And 3 more authors.
Renewable and Sustainable Energy Reviews | Year: 2015

The paper describes the techno-economic of solar drying system (SDS) with water based solar collector in Malaysia. In Malaysia, SDS has been great potential to be used in drying purpose, which is relevant to the local climate. The design, performance and economic analysis of four types SDSs with water based solar collectors in Malaysia were described, (1) SDS with hybrid PVT-mechanical heat pump, (2) SDS with chemical heat pump, (3) SDS with dehumidification system, and (4) Greenhouse SDS with heat exchanger. Economic indicators such as payback period (PP), net present value (NPV), and life cycle saving (LCS) were presented. In addition, the various performances analysis of SDSs with air based solar collectors was presented. The energy and exergy analysis of SDS with water based collector was presented. Moreover, the energy and exergy analysis of PVT water collector was presented. © 2015 Elsevier Ltd.

Premadi A.,National University of Malaysia | Premadi A.,Institute Technology Padang | Ng B.C.,National University of Malaysia | Ab-Rahman M.S.,National University of Malaysia | Jumari K.,National University of Malaysia
Annales des Telecommunications/Annals of Telecommunications | Year: 2010

This paper presented a simple monitoring, protection switching, and fast restoration approach for fiber to the home passive optical network (FTTH-PON) using Access Control System (ACS). ACS is developed for centralized monitoring and failure detection from central office (CO) in downstream direction (from CO towards customer sides). The proposed system architecture incorporating low cost and enable the network service providers and field engineers to remotely control the testing module from anywhere in the world and automatically identify any fiber fault and address the failure location in the fiber field. Another unique function of ACS is to provide the activation for optical switching in a restoration scheme which implemented at the drop region of FTTH-PON. A protection device named Customer Protection Device that comprises of programmable optical switches will be employed at the customer sides, just before the optical network unit, for rerouting the disrupted signals to the protection line when failure occurs in the working line to ensure continuous service delivery to customers. © 2010 Institut TELECOM and Springer-Verlag.

Honesti L.,University of Technology Malaysia | Honesti L.,Institute Technology Padang | Majid M.Z.A.,University of Technology Malaysia | Djali N.,Bung Hatta University | Muchlian M.,Andalas University
Jurnal Teknologi | Year: 2015

Padang was destroyed by tsunamis generated by the earthquakes in the history of Padang. As an area located in a coastal region, its buildings in Padang face major vulnerability against a tsunami. The objectives of this study are to develop the potential impact model of building vulnerability toward tsunami hazard and to compare the building damage levels based on water inundation, internal, and external factors in Ulak Karang and Pasir Jambak sub-districts. The objective of this research is also to give recommendation to government in making planning strategies for reducing and managing the tsunami risk on building vulnerability. There are three stages of modeling; first stage in this study is simulating an eartquake model for two study areas to estimate the maximum inundation. The second stage of modeling is implementing the spatial analysis of building vulnerability based on the field surveys and GIS. The third stage to conlude is developing the Relative Vulnerability Index (RVI) scores of buildings by mapping the building vulnerability toward tsunami hazard and giving several alternatives to develop a risk management plan in a coastal community. The result shows that Ulak Karang sub-district is determined to be more vulnerable than Pasir Jambak sub-district because many buildings near the coastline of Ulak Karang sub-district are made of timber and are arranged close to each other. Moreover, many buildings in Ulak Karang sub-district, especially along the river, are made of traditional brick. Although near Pasir Jambak coastline many buildings are made of timber, but the buildings are not close to each other. There are several alternatives to increase resilience of buildings in a coastal zone, namely: 1) regulation for buildings that have RVI: 4 and 5; 2) building codes; 3) vertical evacuation structures; 4) land use zones; 5) sea walls along the coastlines; 6) natural barriers and 7) early warning system. © 2015 Penerbit UTM Press. All rights reserved.

Yahya M.,Institute Technology Padang
International Journal of Photoenergy | Year: 2016

The performance of a solar assisted heat pump dryer integrated with biomass furnace has been designed and evaluated for drying red chillies, and drying kinetics of red chillies were evaluated. The red chillies were dried from 22 kg with moisture content of 4.26 db to moisture content of 0.08 db which needed 11 hours, with the average drying chamber temperature, drying chamber relative humidity, and an air mass flow rate of 70.5°C, 10.1%, and 0.124 kg/s, respectively, while the open sun drying needed 62 hours. Compared to open sun drying, this dryer yielded 82% saving in drying time. The drying rate, the specific moisture extraction rate, and thermal efficiency of the dryer were estimated in average to be about 1.57 kg/h, 0.14 kg/kWh, and 9.03%, respectively. Three mathematical models, the Newton, Henderson-Pabis, and Page models, were fitted to the experimental data on red chillies dried by solar assisted heat pump dryer integrated with biomass furnace and open sun drying. The performance of these models was evaluated by comparing the coefficient of determination (R2), mean bias error (MBE), and root mean-square error (RMSE). The Page model gave the best results for representing drying kinetics of red chillies. © 2016 M. Yahya.

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