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Delhi, India

Maharaja Agrasen Institute of Technology is a private Engineering College, located in New Delhi, India. One of the leading and reputed colleges of Delhi and North India, MAIT has 12 departments . It is affiliated to the Guru Gobind Singh Indraprastha University, Delhi. It is considered one of the top engineering colleges of northern India. Wikipedia.

Jain V.,Maharaja Agrasen Institute of Technology | Sachdeva G.,National Institute of Technology Kurukshetra | Kachhwaha S.S.,Pandit Deendayal Petroleum University
Energy | Year: 2015

Present paper thermodynamically analyses a VCAS (vapour compression-absorption system) with carbon dioxide (compression section) and ammonia-water (absorption section) as refrigerants and determines the optimal condensing temperature of cascade condenser using modified Gouy-Stodola equation. The optimum cascade condenser temperature is found to be-13°C for 175kW refrigeration capacity at an evaporator temperature of-45°C and condenser temperature of 35°C. The optimum cascade condenser temperature maximises the overall COP, rational efficiency and minimises the total irreversibility rate of the VCAS system. The value of optimum condensing temperature and its corresponding maximum COP, and minimum irreversibility rate are discussed for a wide range of operating conditions. Further, a comparative study of TSVCS (two stage vapour compression system) used for low temperature refrigeration applications with VCAS shows that at design point, primary energy consumption is reduced by 60.6% and electrical COP is improved by 153.6% in VCAS as compared to conventional TSVCS. But the total irreversibility rate of VCAS is 38.4% higher than the TSVCS due to the use of low grade energy in vapour absorption system and hence the rational efficiency of VCAS is 14% low. © 2014 Elsevier Ltd.

Jain V.,Maharaja Agrasen Institute of Technology | Sachdeva G.,National Institute of Technology Kurukshetra | Kachhwaha S.S.,Pandit Deendayal Petroleum University
Energy | Year: 2015

Present work compares the performance of commercially available 170 kW vapor compression chiller with equivalent three configurations (parallel, series and combined series-parallel) of VCAIRS (vapor compression-absorption integrated refrigeration system) based on combined energy, exergy, economic and environmental (4E) analyses. Parallel, series and combined series-parallel configurations reduces the energy (electricity) consumption in the compressor by 50%, 76.8% and 88.3% respectively and consequently, reduce the significant amount of CO2 emission. Comparative exegetic analysis based on modified Gouy-Stodola law was performed which predicted higher irreversibility rate as compared to conventional approach. The thermoeconomic study shows that annual cost of the plant operation is 13.8%, 20.9% and 24.7% less for parallel, series and combined series-parallel configurations respectively as compared to equivalent VCRS (vapor compression refrigeration system) and after optimization, the same is further reduced by 8.1%, 8.5% and 4.7% respectively from the base value. © 2015 Elsevier Ltd.

Jain V.,Maharaja Agrasen Institute of Technology | Sachdeva G.,National Institute of Technology Kurukshetra | Kachhwaha S.S.,Pandit Deendayal Petroleum University
Energy Conversion and Management | Year: 2015

This paper addresses the size and cost estimation of vapor compression-absorption cascaded refrigeration system (VCACRS) for water chilling application taking R410a and water-LiBr as refrigerants in compression and absorption section respectively which can help the design engineers in manufacturing and experimenting on such kind of systems. The main limitation in the practical implementation of VCACRS is its size and cost which are optimized in the present work by implementing Direct Search Method in non-linear programming (NLP) mathematical model of VCACRS. The main objective of optimization is to minimize the total annual cost of system which comprises of costs of exergy input and capital costs in monetary units. The appropriate set of decision variables (temperature of evaporator, condenser, generator, absorber, cascade condenser, degree of overlap and effectiveness of solution heat exchanger) minimizes the total annual cost of VCACRS by 11.9% with 22.4% reduction in investment cost at the base case whereas the same is reduced by 7.5% with 11.7% reduction in investment cost with reduced rate of interest and increased life span and period of operation. Optimization results show that the more investment cost in later case is well compensated through the performance and operational cost of the system. In the present analysis, optimum cascade condensing temperature is a strong function of period of operation and capital recovery factor. The cascading of compression and absorption systems becomes attractive for lower rate of interest and increase life span and operational period. © 2015 Elsevier Ltd. All rights reserved.

Aggarwal B.,Maharaja Agrasen Institute of Technology
Analog Integrated Circuits and Signal Processing | Year: 2010

In this paper a low voltage bulk-driven class AB four quadrant current multiplier is proposed. For the proposed multiplier a bulk-driven class AB current mode cell has been developed and the drain current equations for NMOS and PMOS transistors of the proposed cell have been derived. This cell is used as a basic building block for bulk-driven low voltage current squarer and copier circuit, which is finally used as the fundamental building block of the proposed low-voltage bulk-driven current multiplier operating at ±1 V. All the circuits are simulated using SPICE for 0.25 μm CMOS technology. © 2010 Springer Science+Business Media, LLC.

Sharma S.C.,Maharaja Agrasen Institute of Technology | Gahlot A.,Maharaja Surajmal Institute of Technology
Physics of Plasmas | Year: 2010

The nonlinear coupling between drift waves and a lower-hybrid pump wave is studied in a magnetized dusty plasma cylinder. The growth rate and mode frequencies were evaluated based on typical dusty plasma parameters. It is found that the unstable drift mode frequency increases and the growth rate decreases sharply with the relative density of negatively charged dust grains. In addition, the growth rate and unstable mode frequency depend on pump wave amplitudes. © 2010 American Institute of Physics.

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