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Hydrothermal Synthesis of Fe Based MOFs with Energy Economy Approach
Israr, Farrukh,Kim, Duk Kyung,Kim, Yeongmin,Oh, Seung Jin,Ng, Kim Choon,Chun, Wongee The Korean Society for Energy 2015 에너지공학 Vol.24 No.2
The mesoporous metal organic framework structure Fe-BTC was successfully synthesized by hydrothermal process with noticeable yield. The synthesis operation was conducted at intermediate temperature and for shortened operation time as compared to conventional procedures. This process approach with reduced operating temperature and shortened operation time may open an opportunity window towards process economy with reduction in energy consumption. A simple mathematical approach of diffraction indexing using X-ray diffraction patterns of synthesized powder was employed to confirm its crystalline nature and to investigate its high temperature stability. The crystallite size was calculated by using Debye-Scherrer equation.
Cost effective and low energy consuming hydrothermal synthesis of Ni based MOF
Israr, Farrukh,Kim, Duk Kyung,Kim, Yeongmin,Oh, Seung Jin,Ng, Kim Choon,Chun, Wongee The Korean Society for Energy 2015 에너지공학 Vol.24 No.2
The mesoporous metal organic framework structure of Ni-BTC was successfully synthesized in a low temperature and short operation time via hydrothermal synthesis process. Such operational route virtuously consumed less electrical and thermal energy. It proved time saving along with acceptable product yield (38%). The product was characterized through FESEM, FT-IR, XRD and $N_2$ gas adsorption measurement. Hightemperature stability of synthesized MOF was gauged by diffraction indexing of XRD patterns of as synthesized and heat treated samples of MOFs. The mathematically calculated particle size of Ni-BTC was found to be 42nm.
JAYAPRAKASH SATHTHASIVAM,GARY TANG,KIM CHOON NG 대한설비공학회 2010 International Journal Of Air-Conditioning and Refr Vol.18 No.1
The application of Fault Detection and Diagnosis (FDD) could play a key role in operating chillers at optimum e±ciency. As air-conditioning consumes a significant proportion (approximately 30% to 50%) of the total power consumption of a commercial building, an e®ective FDD tool is very much required for a reliable and economic chiller operation. In this paper, the renowned Simple Thermodynamic Model, STM (also known as Gordon and Ng Universal Chiller Model) was utilized to detect and diagnose some of the common faults in centrifugal chillers. Based on the readily available, nonintrusive, steady state measurements extracted from the on-site chillers, the STM model was regressed to obtain two physically meaningful coe±cients, namely, Thermal Resistance and Internal Entropy Generation. These information-rich coe±- cients were then analyzed to evaluate the performances and the conditions of the chillers. Despite the large and yet complex on-site chiller operations, equipped with built-in heat recovery, such as economizer and intricate control mechanisms, the predictive and diagnostic capabilities of STM in detecting chiller faults has been successfully tested and evaluated based on the data collected from on-site centrifugal chillers. Faults like condenser fouling and reduction in condenser cooling water flow rate were succinctly captured by the STM model.
An Energy Rating Methodology for Long Term Performance Evaluation of Renewable Energy Systems
Muhammad Wakil Shahzad,Kyaw Thu,YounCheol Park,Seung Jin Oh,Kim Choon Ng 한국에너지기후변화학회 2013 에너지기후변화학회지 Vol.8 No.2
This paper describes a simple methodology for determining the long term performance of renewable energy systems (solar, photovoltaics, wind turbines, etc) that is important for project evaluation. Overall efficiency of solar collector hot water plants, photovoltaics and wind turbines are examined by using a ratio of output of useful effects to energy input. Long-term efficiency of class A solar collectors is typically higher ≥ 50%in thermal energy whilst the silicon-based photovoltaics has only <10% efficiency in electricity: In these mentioned cases, the useful output differ in form, obscuring the comparison of one renewable system to the other.The thermal or electricity rating proposed here enable one to make a performance comparison across a host of renewable energy systems. Based on the long term performance rating, itwill assist engineers and managers topredict accurately the payback periods of renewable energy plants as well as the annual carbon emissions.