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An experimental investigation is carried out to evaluate the effects of biodiesel-ethanol (BE) blends, biodiesel-dimethyl carbonate (BC) blends and biodiesel-diglyme (BG) blends on the combustion, performance and emission characteristics of a diesel engine operated at different loads and constant engine speed. Compared with biodiesel, for a specific engine load, the BE and BC blends have lower peak cylinder pressure at full load, while the BG blends show a slight variation in the peak cylinder pressure. In comparison with biodiesel, the BE, BC and BG blends have slightly higher brake thermal efficiency. Drastic reduction in smoke is observed with BE, BC and BG blends at higher engine loads. The BSNO x emissions are found slightly lower for BE, BC and BG blends almost at all loads. The BE and BC blends have a slight variation in the BSCO and BSHC emissions, while the BG blends have lower BSCO and BSHC emissions.

In this article, adsorption rate of different desiccants such as Activated alumina, Molecular sieve, and Activated carbon for producing dry air is proposed.This paper emphasized thoroughly the effect of different inlet conditions like mass of desiccant, type of desiccant and mass flow rate of air on adsorption rate by the desiccant when the atmospheric air after passing through the desiccant bed under the climatic conditions of Coimbatore.Taguchi’s method was used for statistical analysis of experiments.Taguchi’s design of experiments approach L9 orthogonal array (OA) was selected and optimum level of parameters was chosen by larger-the-better signal-to noise (S/N) ratio for this investigation. Also Analysis of variance (ANOVA) was utilized to found the most important parameter in finalizing adsorption rate and develope the empirical model. Finally an optimum level of parameters was used in confirmation test and confirmed that the predicted values in both methods ie., regression model and the equation of predicted S/N ratio were close enough themselves and also in experimental values. Statistical results (at a 95% confidence level) show that the desiccant mass (A), desiccant type (B) and mass flow rate of air (C) affect the adsorption rate by 25.21%, 34.74 % and 38.31% in the air dehumidification process, respectively. Comparison of the performances showed that at high mass flow rate of air the adsorption rate was larger for Activated alumina than that at low flow rate than Molecular sieve and activated carbon.

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