R.K. Yadav

Comparative Thermodynamic Analysis of Combined and Steam Injected Gas Turbine Cycles

This paper presents a comparative study of first and second law thermodynamic analysis of combined and recuperated and non-recuperated steam injected gas turbine cycles. The analysis has been carried out by developing a computer code, which is based on the modeling of various elements of these cycles. The gas turbine chosen for the analysis is MS9001H developed recently by GE and the steam cycle is having a triple-pressure heat recovery steam generator with reheat. It has been observed that the combined cycle is superior to the steam injected cycle, however, the gap narrows down with increasing compressor pressure ratio and high value of turbine inlet temperature. The detailed exergy losses have been presented in various elements of combined and steam injected cycles.© 2003 ASME

Thermodynamic Analysis of Intercooled Gas-Steam Combined and Steam Injected Gas Turbine Power Plants

The current emphasis on the development of gas turbine related power plants such as combined and steam injected is on increasing the plant efficiency and specific work while minimizing the cost of power production per kW and emission. The present work deals with the thermodynamic analysis of intercooled (both surface and evaporative) gas/steam combined and steam injected cycle power plants. The intercooling has a beneficial effect on both plant efficiency and specific work if the optimum intercooling pressure is chosen between 3 and 4. The evaporative intercooler is superior to surface type with reference to plant efficiency and specific work.Copyright

Thermodynamic Evaluation of Humidified Air Turbine (HAT) Cycles

The present work deals with the parametric energy analysis of humidified air turbine (HAT) cycles, identifying the best plant arrangement and predicting the influence of operating parameters on plant performance. In predicting performance plant optimization is to be achieved for an overall pressure ratio. The results presented will be helpful to designers to select the best configurations and optimum operating parameters. The best configuration among the chosen configurations is the one in which there are three intercoolers and two aftercoolers.Copyright

Effect of Gibberllic acid on Growth, Yield and Economics of Maize (Zea mays L.)

The aim of present investigation was to study the effect of foliar application of gibberellic acid (Progibb 40% WSG) spraying at 4-5 leaves stage of the maize crop. Two field experiments were conducted during kharif 2014 and rabi 2014-15 at Research Farm, Zonal Agricultural Research Station, Jhabua. Seven treatments (T = 20, T 30, T 40, T 50 T 60 gibberellic acid g/ha, Tricontanol 1 2= 3= 4 = 5= 0.1%= 250 ml/ha and control) were tested in randomized block design with three replications. Results showed that variation in different doses of gibberellic acid had significant effect on growth character (plant height and silking) and yield attributes (no. of cobs/plant, cob length, no. of grains/cob and cob weight/cob); grain yield and stover yield of maize in both the seasons. Higher values of plant height (197.33 and 205.5 cm) and silking (53.67 and 54.67) was recorded with the spraying of gibberellic acid @ 60 g/ha in both the seasons, respectively. Similarly the higher yield attributes viz., no. of cobs/plant (1.48 and 1.49), cob length (17.40 and 17.78 cm), no. of grains/cob (443.33 and 456.67) and cob weight/cob (93.2 and 97.32) were recorded with the application of gibberellic acid @ 50 g/ha in both the seasons, respectively. Application of gibberellic acid @ 50 g/ha produced highest grain yield (3522 and 4277 kg/ha) and stover yield (51.05 and 5413 kg/ha) which was statistically at par with doses of 40 g/ha, 60 g/ha and tricontanol 0.1% @ 250 ml. The maximum gross return (Rs. 56,347 and 65,854), net return (37,722 and 47,229), B: C ratio (3.03 and 3.54), production efficiency (32.49 and 37.19 kg/ha/day) and economic efficiency (339.84 and 410.69 Rs./ha/day) recorded with gibberellic acid @ 50 g/ha. Enhancing of production, productivity and profitability of maize under Jhabua Hill of Madhya Pradesh gibberellic acid applied @ 50 g/ha at 4-5 leaf stage of crop.

Fodder Yield and Quality of Pearl Millet (Pennisetum glaucum L.) Genotypes as Influenced by Salinity of Irrigation Water in North Western India

The present study was undertaken to assess the effect of irrigation water salinity and verieties on forage yield and quality of pearl millet in north western India. The experiment was conducted with four main-plot treatments consisting of levels of saline irrigation water i.e. normal (~0.6 dS/m) and 3, 6 and 9 dS/m irrigation water and two sub-plot treatments of pearl millet varieties i.e. AVKB-19 and ICMV-15111. The minimum DM content (15.71 and 16.68%), maximum CP content (9.26 and 7.48%) and (EE) (2.36 and 1.81%) was recorded at 1st cut and 2nd cut, respectively under good quality water. Among the genotypes, at 1st and 2nd cut, the maximum DM content (17.57 and 20.19%) was recorded in cv. ICMV-15111 compared to AVKB-19 (16.47 and 17.36%). In contrast, AVKB-19 recorded higher CP and EE level than ICMV-15111. Application of good quality water increased the DM yield by 23.34 and 13.69% and CP yield by 46.0 and 22.0% over irrigation water of EC 9.0 dS/m at 1st and 2nd cut, respectively. The cv. AVKB-19 gave higher DM (5.67 and 5.09 t/ha) and CP yield (1.42 and 1.25 q/ha) at the 1st and 2nd cut, respectively over ICMV-15111. The cv. AVKB-19 also recorded higher EE yield than ICMV-15111 at 1st cut while the reverse trend was observed at 2nd cut where ICMV-15111 which showed higher (P=0.05) EE yield over AVKB-19. The maximum NDF (66.35 and 70.64%) and ADF (36.50 and 39.89%) content was recorded with EC 9.0 dS/m at 1st and 2nd cut, respectively. The highest carbohydrate content was recorded with 9.0 dS/m EC water irrigation for 1st and 2nd cuts. Therefore, ABKV-19 genotype of pearl millet proved to be superior and might be adapted for getting higher fodder yield with better quality as compare to the ICMV 15111 under saline environment in north-western region of India.

Sorghum Fodder Production and Its Nutrient Composition under Different Residual Sodium Carbonate Levels in Irrigation Water

An experiment was conducted to evaluate the effect of residual sodium carbonate (RSC) levels in irrigation water and their neutralization with gypsum/H2SO4 on sorghum during kharif season of the year 2013 in micro-plots. The experiment was conducted using randomised block design consisting of 5 treatments of different RSC levels [RSC-nil (control), RSC-5 meq/L, RSC-10 meq/L, RSC-10 meq/L (neutralized 5 meq/L with gypsum), RSC-10 meq/L (neutralized 5 meq/L with H2SO4)]. Increase in concentration of RSC in water from RSC 5 to 10 resulted in reduction in quality parameters like crude protein, yield but extent of reduction was lesser while using RSC water reclaimed with gypsum and sulphuric acid. DM, ash, NDF and ADF contents increased with increased concentration of RSC 5 to 10.

Thermo-Economic Analysis of Combined Cycles

The paper presents a thermo-economic analysis of gas/steam combined cycle. The stated objective is achieved by optimizing thermo-economic parameters for simple combined cycle (large and medium range) and to apply this to economic model of these cycles. The economic parameters evaluated in the present study include discount cash flow rate of return (DCRR) and gross payout period (GPO), two terms commonly employed in engineering economic analysis. DCRR and GPO are calculated for various electric sale and fuel prices. It has been found that maximum value of DCRR and minimum value of GPO are found with large size plant.Copyright