AKHILESH ARORA | Delhi College of Engineering (original) (raw)

Papers by AKHILESH ARORA

Journal of Thermal Engineering, 2015

In the present communication the analysis of a parallel flow double effect absorption refrigerati... more In the present communication the analysis of a parallel flow double effect absorption refrigeration system is performed to compute the optimum solution distribution ratio (optimum distribution of strong solution masses between low and high pressure generators) from the viewpoint of maximum COP and maximum exergetic efficiency. A computational model is developed for the parametric investigation of a double effect parallel flow LiBr/H2O absorption refrigeration system. The effect of generator, absorber and evaporator temperatures on optimum solution distribution ratio is also studied. The results show that the maximum COP and maximum exergetic efficiency is achieved corresponding to same value of optimum solution distribution ratio.

With the advent of highly advanced optics and imaging system, currently biological research has r... more With the advent of highly advanced optics and imaging system, currently biological research has reached a stage where scientists can study biological entities and processes at molecular and cellular-level in real time. However, a single experiment consists of hundreds and thousands of parameters to be recorded and a large population of microscopic objects to be tracked. Thus, making manual inspection of such events practically impossible. This calls for an approach to computer-vision based automated tracking and monitoring of cells in biological experiments. This technology promises to revolutionize the research in cellular biology and medical science which includes discovery of diseases by tracking the process in cells, development of therapy and drugs and the study of microscopic biological elements. This article surveys the recent literature in the area of computer vision based automated cell tracking. It discusses the latest trends and successes in the development and introducti...

This paper reviews the use of Electroencephalogram (EEG) signals for controlling in the field of ... more This paper reviews the use of Electroencephalogram (EEG) signals for controlling in the field of robotics and using a suitable mapping process known as Brain-Computer Interface (BCI). Various decomposition techniques of the EEG signal for feature extraction have been proposed by many researchers. The central idea is to capture and study the brain rhythm associated with actual human movements and using the same in robotics field for the control of Mobile Robots, Humanoids, and even Robotic Wheel-Chair. The main challenges have been to understand what these signal sources are (here, we focus on EEG signals), how can they be recorded and then decoding those signals for building a suitable brain-machine interface (BMI) or BCI. Preparing a database for the decomposition of robot movements is an extremely important part of the process in order to support and validate the control process. The purpose of this paper lies solely in increasing the interaction of human with computers mainly for...

Lecture Notes in Civil Engineering, 2019

In this paper, a comprehensive review of vapour absorption refrigeration systems and hybrid absor... more In this paper, a comprehensive review of vapour absorption refrigeration systems and hybrid absorption refrigeration systems is carried out for solar cooling application. The review shows that a lot of research work has been done on vapour absorption refrigeration systems which include single-effect, double-effect and triple-effect configurations. However, studies pertaining to hybridization of vapour absorption refrigeration systems with vapour compression refrigeration system, ejector refrigeration system or other types of refrigeration systems are quite scant. Also, most of the available studies on hybrid absorption refrigeration system are based on first law of thermodynamics and only a few studies are there which analyse them from the viewpoint of exergy and exergoeconomics. Hence, there is a need to carry out exergy and exergoeconomic analyses of hybrid absorption refrigeration systems together with energy analysis.

International journal of ambient energy, 2021

In the present study, the effects of variation in evaporator and condenser temperatures on first ... more In the present study, the effects of variation in evaporator and condenser temperatures on first and second law efficiency of the cascade system using NH3/CO2 (Ammonia-Carbon dioxide) and C3H6 /CO2 (Propylene -Carbon dioxide) pairs have been carried out. The optimum temperature in cascade condenser temperature corresponding to maximum exergetic efficiency is also determined under for these conditions. It is observed that maximum COP and maximum exergetic efficiency occur at the same cascade condenser temperature. It is observed that optimum cascade temperature increases with increase in evaporator temperature, condenser temperature and approach in cascade condenser. The optimum temperature in cascade condenser for C3H6/CO2 pair is higher than that for NH3/CO2 pair. NH3/CO2 pair offers better exergetic efficiencies at optimum cascade condenser temperature than C3H6/CO2 pair. This also means that overall exergy destruction in NH3/CO2 pair is less than C3H6/CO2 pair.

Efficient refrigeration system using eco friendly refrigerants are of great importance with the g... more Efficient refrigeration system using eco friendly refrigerants are of great importance with the growing application of it. It has been investigated that using expanders in vapor compression refrigeration system (VCRS) in place of conventional VCRS is a viable option to improve the energy efficiencies of refrigeration systems. Advancement in technology also supports the idea to manufacture and integrate expanders into practical VCRS. The present research focuses on analyzing the performance of eco friendly refrigerants in such a system. In the study four refrigerants namely R134a, R1233zd(E), R423a and R1243zf are considered in a expander based VCRS and the thermodynamic analysis is of the system using these refrigerants are done. R134a is taken as a base refrigerant to compare the outcome of other three refrigerants in the system. The COP of the VCRS is found to be in following order R1233zd(E), R134a, R423a and R1243zf where R1233zd(E) has the largest value of COP and R1233zf has t...

A comparative study based on numerical modelling of airflow over a smooth generic bluff body agai... more A comparative study based on numerical modelling of airflow over a smooth generic bluff body against a dimpled one has been taken up in the present study using a reformed CFD FLUENT code. The investigation of flow is carried out using an Ahmed body, 25 degrees rear slant with dimples incorporated on its top as well as rear slant surface with specifications, AR equal to 6.25, and diameter (Ф) 25mm. The turbulent characteristics of the air stream were examined using the reliable two equation k-ɛ model. For an enhanced study of adverse pressure gradients near surfaces, a non-equilibrium state was assumed for the wall interface. All in all, the simulation results show that a drag reduction of 0.3% was obtained by employing dimples with elliptical profile.

Journal of Thermal Engineering

Organic Rankine cycle (ORC) is preferred to convert low temperature geothermal energy to electric... more Organic Rankine cycle (ORC) is preferred to convert low temperature geothermal energy to electricity. Selection working fluids and optimization system parameters are two main approaches to improve the performance of ORC system. Zeotropic mixtures show promise as ORC working fluids owing to better match between the working fluid and the heat source/sink temperatures. This study optimizes the evaporator inlet temperature of mixture R600a/ Di-Methyl-Ether (R600a/DME) for various mass fractions to maximize the net work output and compare the thermal efficiency and exergetic efficiency of system for geothermal water temperature of 393K. Irreversibility in each component of system and mass flow rate of mixture are also found in this analysis by varying mass fraction of R600a. It was found that R600a/DME (0.8/0.2) gives the maximum net work output corresponding to 343K inlet temperature to evaporator. Among all selected proportions, R600a/DME (0.6/0.4) has both maximum thermal efficiency and maximum exergetic efficiency corresponding to 373k inlet temperature to evaporator. Irreversibility present in evaporator is minimum for mass fraction 0.6 of R600a. Mass flow rate of mixture increases with mass fraction of R600a up to 0.6 and then become approximately constant.

Lecture Notes in Mechanical Engineering

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Lecture Notes in Civil Engineering

In the present work, two low GWP fluids, viz. Novec 649 and HFO1233zd[E], have been considered to... more In the present work, two low GWP fluids, viz. Novec 649 and HFO1233zd[E], have been considered to replace R245fa in ORC with and without IHE. A computational model is developed in EES software for the evaluation of cycles. The cycles are studied on the basis of the first law of thermodynamics, and exergy analysis is also carried out. The results substantiate that the first law efficiency of Novec 649 is lower than R245fa, whereas R1233zd[E] shows better first law efficiency than R245fa. The first law efficiency increases with increase in evaporator temperature, whereas it decreases with increase in condenser temperature. The usage of IHE improves the first law efficiency. The exergetic efficiency for R1233zd[E] is higher than other fluids in comparison with R245fa and Novec 649. The effect of degree of superheat in both cycles on exergetic efficiency is to decrease it.

Industrial Engineering Journal

This communication emphasizes on occupational diseases and hazards in engineering industry and ex... more This communication emphasizes on occupational diseases and hazards in engineering industry and explains the Ayurvedic treatment, dietary regime, Ayurvedic Dincharya and techniques for increasing general strength of the persons affected by occupational hazards.Panchkarma therapies are also described for treatment and management of these diseases. The most commonly occurring occupational disease i.e. Asthma can be decreased and treated by Ayurveda effectively.A case study of occupational Asthma is also discussed. There can be many more diseases such as stress, heat stroke, tinnitus, frost bite, dryness of eyes, pains of different types which may occur in industries and offices and can be decreased up to some extent by Ayurvedic medicines and therapies.

SAE International Journal of Commercial Vehicles

Journal of Thermal Science and Engineering Applications

In the present communication, a performance investigation of a double-slope solar still augmented... more In the present communication, a performance investigation of a double-slope solar still augmented with parallel evacuated tubes under forced mode is carried out for a modified geometry. A comprehensive mathematical model is used for the numerical simulation using the experimental data and incorporating the effect of variable flowrate, water depth, and the number of tubes. An optimum flowrate range ∼0.006–0.007 kg/s/tube is found irrespective of the number of tubes and basin water depth to extract optimal energy. The flowrate is validated with other experiments, carried out by various authors. At optimal flowrate with ten tubes and 0.005 m basin water depth, the system yields 6.644 kg, while overall energetic and exergetic efficiencies are observed as ∼33.8% and 4.9%, respectively. With an increase in the tubes as 20 and 30, the respective yields are found to be increased by ∼2.64% and ∼6.62% for nearly the same collector output temperature attainable (≈98.5°C), while the energy and ...

Journal of Cleaner Production