Adsorption chiller is one of the solution related to environmental issues caused by conventional cooling system. This paper presents an experimental performance of adsorption chiller with fin and tube heat exchanger i...
Adsorption chiller is one of the solution related to environmental issues caused by conventional cooling system. This paper presents an experimental performance of adsorption chiller with fin and tube heat exchanger in Mechanical engineering, Universitas Indonesia. The chiller design configuration is composed of two sorption chambers, each has compact fin tube heat exchangers as adsorber, condenser, and evaporator. The chiller is tested under typical condition for hot water inlet/cooling water inlet/chilled water outlet temperatures are 64.4/31/8.9°C, respectively. Heat and mass recovery was adopted in experiment to increase the cooling power. The cooling time was varied to obtain the heat recovery optimum time related to the performance. Average value of COP and cooling power were obtained 0.77 and 3.2 kW, respectively, at adsorption/mass recovery/heat recovery time 600/40/20.
An algorithm for scheduling of the operation of tractors and implements in a sugar cane plantations was developed. The core of the algorithm was an optimization using random search. The schedule was expressed by the c...
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An algorithm for scheduling of the operation of tractors and implements in a sugar cane plantations was developed. The core of the algorithm was an optimization using random search. The schedule was expressed by the combinations of day-shift-tractor-implement-operator-job-field-covering area. To run the algorithm and facilitate data inputting and outputs printing, a prototipe of software named Walsien 1.0 was developed with Visual Basic 4.0 TM
A discrete point sampler has been developed that overcomes disadvantages inherent in several current small-volume samplers. It is designed to obtain ground water samples after a well has been purged with a pump. It co...
A discrete point sampler has been developed that overcomes disadvantages inherent in several current small-volume samplers. It is designed to obtain ground water samples after a well has been purged with a pump. It consists of a sample chamber, two ports, and a stopcock for withdrawing sample aliquots. After lowering the sampler into a well, sampling is initiated by pulling on a line that sequentially removes the plugs in the lower and the upper level ports. The sample chamber fills from the bottom port and vents air from the top port. The device is suitable for sampling for volatile organic compounds in ground waters that are not subject to spontaneous bubble degassing. The upper port is sufficiently far above the lower port that none of the water that is sampled is exposed to the vented air. The sample chamber fills in such a way that the water that is taken from the chamber for analysis is not exposed to the headspace in the chamber.
A research group at the Massachusetts Institute of technology has completed the first phase of the development of a computer assisted model for analyzing complex decisions and policies regarding oil spill cleanup. The...
A research group at the Massachusetts Institute of technology has completed the first phase of the development of a computer assisted model for analyzing complex decisions and policies regarding oil spill cleanup. The model is the product of an ongoing MIT Sea Grant project, sponsored by a consortium of government and industry organizations, including the National Oceanic and Atmospheric Administration, the U.S. C oast G uard , the U.S. N avy , the Commonwealth of Massachusetts, the Spill Control Association of America, JFB Scientific Corporation, the Doherty Foundation, Petro-Canada and Texaco. The model can be used, among other things, in strategic planning for the long-term oil spill response needs of a region, in assisting On Scene Coordinators in responding to a specific spill (tactical/operational setting), in evaluating the environmental and economic damages of a spill versus the cost of cleanup, in simulation and training, and in the analysis of various policy and regulatory issues such as the effects of delays, the use of dispersants and the investigation of liability and compensation issues. The paper describes the model in detail, focuses on its potential uses and presents experience with its application in conjunction with pollution control efforts of the U.S. Navy. Specifically, we outline the application of the model in the Port of Charleston, South Carolina, an ongoing project sponsored by the Naval Facilities engineering Command. The difficulty of gathering data for such an application is discussed.
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