Marwan M.,Polytechnic State of Ujung Pandang
Journal of Process Control | Year: 2014
The aim of this work is to develop a demand-side-response model, which assists electricity consumers exposed to the market price to independently and proactively manage air-conditioning peak electricity demand. The main contribution of this research is to show how consumers can optimize the energy cost caused by the air conditioning load considering to several cases e.g. normal price, spike price, and the probability of a price spike case. This model also investigated how air-conditioning applies a pre-cooling method when there is a substantial risk of a price spike. The results indicate the potential of the scheme to achieve financial benefits for consumers and target the best economic performance for electrical generation distribution and transmission. The model was tested with Queensland electricity market data from the Australian Energy Market Operator and Brisbane temperature data from the Bureau of Statistics regarding hot days from 2011 to 2012. © 2014 Elsevier Ltd. All rights reserved.
Marwan M.,Polytechnic State of Ujung Pandang |
Pirman,Polytechnic State of Ujung Pandang
International Journal of Electrical and Computer Engineering | Year: 2016
The growing demand for air-conditioning is one of the largest contributors to Australia overall electricity consumption. This has started to create peak load supply problems for some electricity utilities particularly in Queensland. This research aimed to develop a consumer demand side response model to assist electricity consumers to mitigate peak demand on the electrical network. The proposed model allows consumers to independently and proactively manage air conditioning peak electricity demand. The main contribution of this research is how to show consumers can mitigate peak demands by optimizing energy costs for air conditioning in a several cases such as no spike and spike considering to the probability spike cases may only occur in the middle of the day for half hour spikes. This model also investigates how air conditioning applied a pre-cooling method when there is a substantial risk of a price spike. The results indicate the potential of the scheme to achieve energy savings and reducing electricity bills (costs) to the consumer. The model was tested with the Queensland electricity market data from Australian Energy Market Operator and Brisbane temperature data from Bureau statistic during hot days. Copyright © 2016 Institute of Advanced Engineering and Science. All rights reserved.
Suleman A.R.,Polytechnic State of Ujung Pandang
ARPN Journal of Engineering and Applied Sciences | Year: 2015
This research aims to the model of the effect by paddy straw fibers on the cover of land surface as a slope erosion controller. This research was tested in the laboratory by using USLE (Universal Soil Loss Equation) model as a comparison to determine the amount of the reduction of the erosion rate that occurs, both on the land without the covering or covering. Research conducted with 3 variations in the intensity of rain that is 50 mm/hour, 100 mm/hour and 120 mm/hour and use artificial rainfall with a Rainfall Simulator. The result of this research showed that the rate of erosion on soil that was given in the form of straw fibers covering layer of the paddy with the cover percentage is 30% dry weight or 38,7gr/m2 had decreased when compared with the rate of erosion occurring on the ground without cover. The magnitude of the rate of erosion that occurred in the cover percentage is 30% dry weight of straw mulch or 38,7 gr/m2averages of 17,068% against the rate of erosion on the ground without cover. In other words, that the rate of erosion on soil without cover will be reduced (decreased) by an average of 82,932% if the land is given a cover layer of paddy straw fibres with a percentage of 30% or cover a dry weight of 38,7 gr/m2. Similarly, the rate of erosion on land given the paddy straw fibres cover layer with the cover percentage respectively 60% and 90% dry weight or each 145,1 gr/m2 and 354,8 gr/m2 also had decreased when compared with the rate of erosion occurring on the ground without cover. The magnitude of the rate of erosion that occurred on land given the cover 60% dry or heavy 145,1 gr/m2 on average by 7,216% and 90% cover on a layer or severe drying 354,8 gr/m2 on average by 4,392%. In other hands, the rate of erosion on soil without cover will be reduced (decreased) by an average of 92,784% on the cover of 60% and an average of 95,608% on the cover of 90%. On the rain intensity of 50 mm/hour, the erosion rate prediction equation that obtained is: E = 3,0273488 e-0,1191688(MJ/S), On the rain intensity of 100 mm/hour, the erosion rate prediction equation that obtained is: E = 6,4748371 e-0,0824717(MJ/S), and similarly, on the rain intensity of 120 mm/hour, the erosion rate prediction equation that obtained is: E = 18,4374973 e- 0,0984739(MJ/S). © 2006-2015 Asian Research Publishing Network (ARPN).
Suleman A.R.,Polytechnic State of Ujung Pandang |
Yusuf H.,Polytechnic State of Ujung Pandang |
Hasanuddin H.A.,Polytechnic State of Ujung Pandang
ARPN Journal of Engineering and Applied Sciences | Year: 2016
Jeneberang river has an important role to control flood in Makassar and Gowa. The estuary is an area of expenditure river water, especially during flood discharges it is a result of a great number of sediment transportation from upstream that will undergo a huge deposition, so the function is not able to performed optimally, especially during flood discharge and partly transported to the beach around the estuary such as, Tanjung Bunga beach and Barombong beach. This study aimed to analyze the type of sediments based on diameter 50 (D50) and the distribution of sediments and how to handle it. The methodology of sediment sampling was conducted directly in the field based on the point of the review that had been determined as data acquisition. Furthermore, sediment samples were analyzed in the laboratory to determine the type of sediments and the distribution. The type of sediments obtained with the number of the review point 6 (six) location of the material, there were 7,56% gravel material, 73,43% sand, 3,47% clay, and 18,05% silt. Based on those sediment types, Jeneberang estuary categorized in the form of a coast as type of a sandy beach and distribution of the size sand grain is equal because the average value (So) is 1,286 located between 1,0 and 1,5 (1,0 ≤ So ≤ 1,5). The alternative treatment is divided into two ways, there are short-term and long-term treatment whereas in the short-term ways is done by doing dredged and for long-term treatment is done by making jetty that pointed out. © 2006-2016 Asian Research Publishing Network (ARPN).
Azis A.,Polytechnic State of Ujung Pandang
International Journal of Applied Engineering Research | Year: 2014
Excessive ground water exploitation may lead to water deficiency and causes land subsidence, sea water intrusion, and ground water quality degradation. To cope with these problems, it is required to study the sand column placed at the base of the recharge reservoir by carrying out physical model testing in the laboratory and also by comparing it to recharge calculation results by using the Darcy Equation based on the research parameters. The objective of this research is to obtain a novelty of the sand column coefficient formula. This is a laboratory experiment research which included the making of recharge reservoir model by using the sand column. The primary data resulted from this model was the recharge debit by various parameters such as: High water level of reservoir, height of sand column, numbers and diameter of sand column and the height difference of energy. Results of this test were then used to compare the calculation resulted from the Equation: (Formula presented). To obtain the sand column coefficient formula, the multiple linear regression analysis was applied. Based on this research, the novelty of sand column coefficient was obtained: Rc = 0,973 + 0,035 z/x + 0,044 d/x, and when inserted to the Equation, it became: (Formula presented). After the simulation, the recharge debit showed values approaching to the research result. © Research India Publications.
Shiddiq Yunus A.M.,Polytechnic State of Ujung Pandang |
Abu-Siada A.,Curtin University Australia |
Masoum M.A.S.,Curtin University Australia
IET Power Electronics | Year: 2012
Application of distributed wind energy conversion systems (WECS) in modern power systems and smart grids has significantly increased during the last decade. In particular, wind turbines equipped with doubly fed induction generator (DFIG) have dominated the market since 2004 as they represented about 55% of the worldwide total wind capacity during this year. This study investigates the application of superconducting magnetic energy storage (SMES) units to improve the dynamic performance of DFIG-based WECS during small and large disturbances in the grid side. A new control approach for the SMES unit using hysteresis current regulator and fuzzy logic is introduced. Detailed simulation results show that the proposed SMES controller is very effective in improving the dynamic performance of the WECS and is able to maintain its parameters within the safety margins of various grid codes during disturbance events considered in this study. © 2012 The Institution of Engineering and Technology.