Browsing by Author "Veershetty, G."

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Experimental study on desalination system using humidification- dehumidification process with baffles in the dehumidifier
(Taylor's University # 1, Jalan Taylor's Subang Jaya, Selangor Darul Ehsan 47500, 2020) Kumara; Veershetty, G.; Ashebir, D.H.
The humidification-dehumidification desalination process is a promising technique to desalinate seawater. To improve the output of a desalination unit the baffle plates are placed in the dehumidifier. The effect of variables on freshwater production was studied experimentally. Two packing materials are used and compared with previous researchers. Operating variables include the air and water temperature at the entry to the humidifier, the humidifier water flow rate, airflow rate and the cooling water flow rate into the dehumidifier. The experimental setup, which includes a geyser for water heating, air heater, humidifier and a baffle plates in the dehumidifier. The results show that by enhancing the temperature up to 60 °C of inlet water supplied to the humidifier,0.785 kg/hr-m2 freshwater was produced. Also, increase in the water flow rate in the humidifier, and the flow rate of cooling water in the dehumidifier, which in turn increases the output of the desalination system with increased production of distilled water. The inlet temperature of cooling water reduced from 30 °C to 20 °C enhances the production of distilled water significantly. The productivity increases by 60 % with baffle plates inside dehumidifier as compared to without baffles. © 2020 School of Engineering, Taylor's University.
Humidification Dehumidification Desalination Using Solar Collectors
(2018) Kumara; Veershetty, G.
The performance of a solar powered humidification-dehumidification system is studied theoretically for various constant parameters such as water flow rate, air flow rate, and cooling water temperature of dehumidifier etc. and varying solar intensity under climatological conditions of Surathkal, India. The primary components of the system are parabolic trough solar water heater, solar air heater, a humidifier, a dehumidifier and a storage tank. The mathematical model is developed by means of MATLAB software and governing equations are numerically solved using 4th order Runge-Kutta method. Daily and seasonal clean water productions are calculated for the system. Water is heated by using parabolic trough air heater whereas air is heated by solar air heater. The system used in this work is based on the idea of closed air and open water cycles. � Published under licence by IOP Publishing Ltd.
Humidification Dehumidification Desalination Using Solar Collectors
(Institute of Physics Publishing helen.craven@iop.org, 2018) Kumara; Veershetty, G.
The performance of a solar powered humidification-dehumidification system is studied theoretically for various constant parameters such as water flow rate, air flow rate, and cooling water temperature of dehumidifier etc. and varying solar intensity under climatological conditions of Surathkal, India. The primary components of the system are parabolic trough solar water heater, solar air heater, a humidifier, a dehumidifier and a storage tank. The mathematical model is developed by means of MATLAB software and governing equations are numerically solved using 4th order Runge-Kutta method. Daily and seasonal clean water productions are calculated for the system. Water is heated by using parabolic trough air heater whereas air is heated by solar air heater. The system used in this work is based on the idea of closed air and open water cycles. Â© Published under licence by IOP Publishing Ltd.
Intermediate Pyrolysis Of Coconut Shell: Isolated Fractions Of Bio-Tar
(Toronto Metropolitan University, 2019) Kiran Kumar, D.; Veershetty, G.
The thermochemical conversion of lignocellulosic biomass coconut shell into pyrolytic oil (bio-oil/bio-tar) through intermediate pyrolysis has been considered in this study. It is a fixed bed pilot scale reactor heated externally with the help of electric heaters. The major end products with good yield are solid (bio-char), liquid (bio-oil) and gases. The optimum temperature is 575oC. The intermediate pyrolysis of coconut shell bio-oil/bio-tar was separated into SARA (Saturate, aromatic resin and asphaltene fractions by using the column chromatography with the combination of npentane, toluene and ethanol solvents. The SARA fractions were further characterized by Fourier transform infrared (FTIR) spectra and elemental analysis. Â© 2019, Toronto Metropolitan University. All rights reserved.
Parametric investigation of organic rankine cycle evaporator for low temperature applications
(Sultan Qaboos University PO Box 33 Al-Khodh, Muscat 123, 2019) Upadhyaya, S.; Veershetty, G.
The present work deals with the development of thermodynamic model of low temperature basic Organic Rankine Cycle (ORC) system and a chevron plate heat exchanger evaporator sub-model using Engineering Equation Solver (EES). Work output is evaluated using the ORC thermodynamic model, while the evaporator sub-model calculates the total surface area of the heat exchanger. Using these mathematical models, the effect of evaporation pressure, expander inlet temperature and pinch point temperature difference (PPTD) on the network output and evaporator cost are studied. In addition to this, the effect of plate spacing and plate width of chevron plate heat exchanger on pressure drop and evaporator cost are analyzed in detail. Finally, thermodynamic and geometric optimization is carried out using genetic algorithm to identify the optimum parameters at which the network output is maximized and pressure drop in the evaporator is minimized. Sensitivity analysis showed that optimum evaporator pressure existed at which network output is maximum. Thermodynamic optimization showed that work output was maximum (5.03 kW) at evaporator pressure of 5.77 bar. No improvement in the work output was seen with increase in PPTD and expander inlet temperature. Increase in plate width and plate spacing led to increase in evaporator cost and decrease in pressure drop. © 2017 Journal of Engineering Research.