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Dalai P.,CVRCE | Nanda P.,VSSUT | Mund C.,CVRCE | Mishra D.,VSSUT | Gupta A.,Hi Technology Institute of Technology
Energy Procedia | Year: 2017

An experimental study of the performance of an air conditioning system, using the concept of humidification-dehumidification is presented and investigated. The technique (AWVP) relies on utilizing the moisture present in atmospheric air and to increase its content to certain extent. The water extracted through this technique is of good standard and can be used for drinking and other purposes. The test setup consists of four loops namely fresh water circuit, air circuit, refrigerant circuit and dirty water circuit. Certain operating parameters like volume flow rate of air, air inlet temperature after heating and relative humidity was varied and its effect on the performance of the system was studied and analyzed. © 2017 Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license.


Das S.K.,Hi Technology Institute of Technology | Moharana J.K.,Dhaneswar Rath Institute of Engineering and Management Studies
Proceedings of 2013 International Conference on Power, Energy and Control, ICPEC 2013 | Year: 2013

The STATCOM (STATic synchronous Compensator) is being increasingly popular in power system applications. In general, reactive power compensation for power factor and stability of the utility system can be improved. A simple dq transformation and steady state and transient analysis are achieved to characterize the open loop system. A control scheme of the STATCOM has been proposed without controlling DC link voltage. The small signal scheme controls the phase angle as well as modulation index of the switching pattern and with small perturbation of reference current (reactive current of load), the DC voltage nearly remains constant. On variation of DC link voltage, the spike and overshoot of the responses have been studied and suitable DC link voltage has been selected. All responses are obtained trough MATLAB simulink tool box and presented here for clarity of the control strategy. © 2013 IEEE.


Panda G.,I.G.I.T | Dash S.K.,I.G.I.T | Sahoo N.,HI Technology Institute of Technology
Proceedings - 2012 International Symposium on Electronic System Design, ISED 2012 | Year: 2012

This paper describes the design of Hysteresis Current Controller (HCC) for a single-phase Hybrid Active Power Filter (HAPF) using Simulink and Xilinx System Generator as a design platform. At the present age, elimination of harmonics produced by the nonlinear loads to improve the power quality is a great issue. To overcome the problem due to harmonics, Active Power Filters (APFs) are used with various control schemes. But Hybrid Active power filter is a power electronic device which has both the characteristics of passive power filters and active power filters, helps in cancelation of the harmonics by producing compensating signal. The digital controller design and its simulation are presented, showing acceptable THD results for the word length used in the fixed-point computations involved in the switching sequence generation. © 2012 IEEE.


Panda G.,I.G.I.T | Dash S.K.,I.G.I.T | Sahoo N.,HI Technology Institute of Technology
India International Conference on Power Electronics, IICPE | Year: 2012

This paper describes the performance analysis of single phase Shunt Active power filter (SAPF) verses Hybrid Active Power Filter (HAPF) using Simulink and Xilinx System Generator as a design platform. At the present age, elimination of harmonics produced by the nonlinear loads to improve the power quality is a great issue. To overcome the problem due to harmonics, Active Power Filters (APFs) are used with various control schemes. But Hybrid Active power filter is a power electronic device which has both the characteristics of passive power filters and active power filters, helps in cancelation of the harmonics by producing compensating signal. The digital controller design and its simulation are presented for both the filter types, showing acceptable THD results for the word length used in the fixed-point computations involved in the switching sequence generation. © 2012 IEEE.


Shinde P.S.,Hi Technology Institute of Technology
Applied Mechanics and Materials | Year: 2012

Efficient grinding of structural ceramics requires judicious selection of operating parameters to maximize removal rate while controlling surface integrity. Grinding of ceramics is difficult because of its low fracture toughness, making it very sensitive to cracking. In the present work, experiments were carried out to study the effect of wheel parameters such as grain size and grinding parameters like depth of cut and feed rate on the surface roughness and surface damage. The significance of the grinding parameters on the selected responses is evaluated using analysis of variance. Mathematical statistics like "Minitab" is used to analyzed the grinding conditions for maximum material removal, using a multi-objective function model, by imposing surface roughness, surface force and surface damage constraints. The choice of including manufacturer & apposes constraints on the basis of functional requirements of the component for maximizing the production rate is also embedded in the Mathematical statistics. For the verification of present work, the Mathematical statistics results are compared with experimental work. © (2012) Trans Tech Publications, Switzerland.


Swain S.,Indian Agricultural Research Institute | Swain S.,Central Agricultural Research Institute | Samuel D.V.K.,Indian Agricultural Research Institute | Bal L.M.,Indian Institute of Technology Delhi | And 2 more authors.
Food Science and Biotechnology | Year: 2012

Drying kinetics modeling and effective moisture diffusivity (Deff) of osmotically dehydrated pretreated red sweet pepper (Capsicum annum L.) during microwave assisted convective drying at power levels of 0. 35, 0. 70, 1. 05, and 1. 4 W/g, air temperature of 30, 45, and 60°C, and constant air velocity of 1. 5 m/s were investigated. The drying data were applied to 11 different semi-empirical mathematical models to characterize the drying kinetics and Page model provided a good agreement between experimental and predicted moisture ratio values with higher coefficient of determination (R2) and lower root mean square error (RSME) and residual sum of square (RSS). Deff decreased from 1. 859×10-7 to 3. 55×10-8 m2/s which is 102 to 103 times more than the previous investigations for food materials. Similarly, the activation energy decreased from 8. 943 to 5. 228 with decrease of drying temperature from 60 to 30°C which is due to the effect of pretreatment (osmotic dehydration). So, pretreatment can be used as criteria for faster drying thereby maintaining final product quality. © 2012 The Korean Society of Food Science and Technology and Springer Netherlands.


Jena S.,Hi Technology Institute of Technology | Babu B.C.,National Institute of Technology Rourkela | Sahu L.,National Institute of Technology Rourkela
Proceedings - 2011 Annual IEEE India Conference: Engineering Sustainable Solutions, INDICON-2011 | Year: 2011

In the present scenario distributed generation (DG) system uses current regulated PWM voltage-source inverters (VSI) for synchronizing the utility grid with DG source in order to meet the following objectives: 1) ensure grid stability 2) active and reactive power control through voltage and frequency control 3) power quality improvement (i.e. harmonic elimination) etc. In this paper the comparative study between adaptive hysteresis and hysteresis current controller is presented for 1-Φ grid connected inverter system. The main advantages of adaptive hysteresis current controller are constant switching frequency of operation, better dc-bus voltage utilization, simple filter design and low total harmonic distortion (THD) at the point of common coupling (PCC). The studied system is modeled and simulated in the MATLAB-Simulink environment. Further, an experimental work has been carried out in the laboratory set-up in the discrete-domain via TMS320F2812 digital signal processor (DSP) and we could find there is an effective validation with simulated results. © 2011 IEEE.


Jena S.,Hi Technology Institute Of Technology | Babu B.C.,National Institute of Technology Rourkela | Mishra G.,Hi Technology Institute Of Technology | Naik A.Ku.,Sudargarh Engineering College
Proceedings - 2011 International Conference on Energy, Automation and Signal, ICEAS - 2011 | Year: 2011

The consumption of reactive power is stochastic in nature for the distribution system. This uncertain variation of the reactive power leads to 1) Variation of voltage at the point of common coupling(PCC) 2)Low power factor 3)low efficiency 4) improper utilization of distribution system and 5) loss of synchronism for a grid connected inverter based - distributed generation. Now a day's distributed generation (DG) system uses current regulated PWM voltage-source inverters (VSI) for synchronizing the utility grid with DG source in order to ensure the grid stability. In this paper reactive power compensation based hysteresis controller and adaptive hysteresis controller is analyzed for inverter interfaced DG which can control the active and reactive power independently. The adaptive hysteresis controller can reduce the current harmonic at PCC considerably which ensures lower total harmonic distortion (THD). The performance indices include THD of the grid current, fast current tracking during steady state and transient conditions. The studied system is modeled and simulated in the MATLAB Simulink environment. © 2011 IEEE.


Jena S.,Hi Technology Institute of Technology | Babu B.C.,National Institute of Technology Rourkela | Naik A.K.,Sudargarh Engineering College | Mishra G.,Hi Technology Institute of Technology
Proceedings - 2011 International Conference on Energy, Automation and Signal, ICEAS - 2011 | Year: 2011

Now a day's distributed generation (DG) system uses current regulated PWM voltage-source inverters (VSI) for synchronizing the utility grid with DG source in order to meet the following objectives: 1) To ensure grid stability 2) active and reactive power control through voltage and frequency control 3) power quality improvement (i.e. harmonic elimination) etc. In this paper the comparative study between hysteresis and proportional integral (PI) with hysteresis current controller is presented for 1-Φ grid connected inverter system. The main advantage of hysteresis+PI current controller is low total harmonic distortion (THD) at the point of common coupling (PCC) at a higher band width of the hysteresis band. The studied system is modeled and simulated in the MATLAB Simulink environment. © 2011 IEEE.

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