S.K. Shukla

Experimental analysis of combustion characteristics on a variable compression ratio engine fuelled with biodiesel (castor oil) and diesel blends

ABSTRACT Castor biodiesel was used to investigate the combustion characteristics of a variable compression ratio engine with blending ratio of B00 to B50 and compression ratio from 15 to 18. After extensive experimental work and observation, the effect on various parameter like mean gas temperature, cylinder pressure variation, net heat release, and mass fraction burned are compared with compression ratio and blending ratio. Observations have been drawn on the effects of the above parameters with various inputs. Mean gas temperature increases with compression ratio for all blending ratios and gives maximum value for B00. Cylinder pressure increases with compression ratio and maximum value is obtained at compression ratio 18 for B50. Net heat release decreases with compression ratio and maximum value is obtained for B00 at compression ratio 15. Mass fraction burned is better for B20 and poor for B50 for compression ratio 15 and 18.

Lightweight Localization Using Trilateration for Sensor Networks

Localization is an unavoidable procedure in location aware sensor networks. In such networks, management of a large amount of location information along with its processing and updating is highly desirable at a central station of the network. In this paper, we have discussed the implementation of software layer to be run on various types of sensor nodes in the localization network, which has been dealt with extensively along with some of the addressed problems and their respective solutions. In addition, the article discusses implementation of an already mathematical formulation of least squares trilateration, which has not yet been attempted in the space of wireless sensor networks. To support our clam we performed experimental analysis on

Evaluation of convective heat and mass transfer in Open Sun and Green House Drying

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Experimental Investigation and Thermodynamic Performance Analysis of a Solar Distillation System with PCM Storage: Energy and Exergy Analysis

telosb motes. Experimental results of proposed framework shows that average error with respect to the physical location estimation can be reduced upto 46.66 % using 4 anchor node as compare to three anchor nodes at outdoor scenario and upto 40 % in indoor scenario.

Performance Evaluation of a Desiccant Dehumidifier using Different Desiccants

In this paper, an experimental study has been conducted on the hybrid desiccant cooling system by removing the latent heat and sensible heat of air separately by mixing it with the desiccant solution in a counter flow manner. This makes air totally dry and thus saves the energy to cool the air in the refrigeration system. The desiccant chosen here is the aqueous solution of calcium chloride. The packed bed inside the absorber as well as the regenerator consists of a polypropylene cascade ring for the efficient mixing of air and desiccant solution. The effects of various parameters such as desiccant inlet temperature, air inlet temperature, mass flow rate of air and desiccant solution have been studied to investigate the performance of the system. Comparing the results with previous studies, a fair agreement has been reported.

Analysis of PCM storage unit for night coolness storage in summer season

In this paper, a study on open sun and green house drying has been performed to evaluate the convective heat and mass transfer coefficients as a function of climatic parameters. The hourly data for the rate of moisture removal, crop temperature, relative humidity inside greenhouse and outside greenhouse and ambient air temperature for complete drying have been recorded. The experiments were done in the premises of Allahabad Agricultural Institute-Deemed University, after the crop-harvesting season from February 2006 to April 2006. Using these data, the value of convective heat and mass transfer in Open Sun Drying (OSD) and Green House Drying (GHD) under natural and forced convection mode have been calculated. On the basis of this study, it is inferred that the value of convective heat and mass transfer is more in OSD than in the Green House Drying (GHD) under natural convection mode. However, its value increases in forced mode of GHD when compared with natural mode in the initial stage of drying.

Experimental investigations and comparison of energy and exergy efficiencies of the box type and Solar Parabolic Cooker

SYNOPSIS Based on energy balance equations, the expressions for effective absorptance and transmittance product (ατ)eff water and glass temperatures, yield and instantaneous efficiency of a passive solar still have been derived. A computer model has been developed to predict the performance of a solar still using the inner glass temperature. The present model uses values of constants Cinner and ninner obtained from using experimental data from 16, 17, 18, 19 and 20 June 2001, in the climatic conditions of Delhi. It is inferred that there is reasonable agreement between the experimental and predicted theoretical results.

Product cost calculations of various designs of conventional solar still systems

ABSTRACTThis article presents the experimental performance investigation of solar still integrated with two types of phase change materials namely Lauric acid and Myristic acid independently, used as storage medium of solar energy. The experiments were performed during the months of April-May 2011, under Indian climatic conditions. The effect of input parameters such as mass of water in basin and mass of phase change material integrated with solar still basin on productivity of the solar still has been studied. Also on the basis of the experimental data the values of exergy and energy were calculated. It has been found that (i) productivity of solar still integrated with Lauric acid is 22% more than the solar still integrated with Myristic acid. (ii) the energy efficiencies for solar still integrated with Lauric acid and Myristic acid are found to be 39.6% and 34.4% where as exergy efficiencies values are 0.29% and 0.74% respectively (iii) the cost of using Lauric acid is lesser than using Myristic acid f...