Pandit Deendayal Petroleum University

About: Pandit Deendayal Petroleum University is a education organization based out in Gandhinagar, Gujarat, India. It is known for research contribution in the topics: Welding & Computer science. The organization has 996 authors who have published 1804 publications receiving 16594 citations.

Stable isotopic differences between summer and winter monsoon rains over southern India

Abstract: Rain drop size and isotopic composition of rain, important parameters that shed light on rain formation processes, are highly sensitive to the ambient weather. We reported earlier a significant correlation between them in individual rain events (with limited sampling), but this is yet to be tested with better, longer term sampling. Here we attempt to do so over a tropical region (i.e. Tirupati, India). Rain samples were collected at short time intervals (<1 h) to capture even small variations in their stable oxygen (δ18O) and hydrogen (δD) isotopic compositions. Isotopic analyses were made using an isotope ratio mass spectrometer, and a disdrometer measured the drop size distribution. Summer rains show a progressive 18O & D depletion with time, while the winter rains fluctuate about a mean value. We find no definite correlation between the drop size and stable isotope ratios as was reported earlier, based on a smaller number of samples: the complexity of rain formation process and varying ambient weather conditions for individual rain events could be the reason. Further, there is no significant difference between the local meteoric water lines (δ18O- δD line) of summer and winter monsoon rains, though the intercepts in both the cases were significantly smaller than global meteoric waterline, suggesting significant strong influence of secondary evaporation. However, the winter rains are more depleted in D & 18O. Paleoclimate proxies such as δ18O of cave calcite or teak cellulose form this region need to be interpreted in terms of the relative seasonality of the rainfall rather than the total annual rain.

Cost analysis of solar parabolic trough collector for cooking in Indian hostel – a case study

Abstract: The primary fuel used for cooking in most of the hostels in India is LPG which costs around 700–1500 rupees per cylinder. The temperature requirement for most of the meals to be prepared is in the ...

Feasibility study for offshore wind power development in India based on bathymetry and reanalysis data

Abstract: The present study provides a summary of offshore wind power development in India by utilizing daily 6-hourly NCEP-CFSv2 reanalysis wind data and bathymetry data. Geographic Information System (GIS) methodology was adopted in this study. Wind speed, wind power density (WPD), and capacity factor (CF) maps were developed at a height of 80 m above sea level (asl) to understand the spatial distribution of the winds over the exclusive economic zone (EEZ). By utilizing offshore wind resources, India can generate up to ~6 times its anticipated requirement of 1915 TWh for the year 2021–2022, which can reduce CO2 emissions up to 104 Mt per year. Outcomes of the present study are expected to be useful for developers, planners, and decision-makers in formulating policies for offshore wind power development in India.

Comparative Performance of Recent Advanced Optimization Algorithms for Minimum Energy Requirement Solutions in Water Pump Switching Network

Abstract: The present work explores the qualitative and quantitative comparative analysis of nine recently developed meta-heuristic algorithms for the optimization of water pump switching problem. Heat transfer search algorithm, Water wave optimization, Ant lion optimizer, Symbiotic organisms search algorithm, Artificial Bee Colony algorithm, Cuckoo search algorithm, Passing vehicle search, Biogeography based optimization, and Sine–cosine algorithm are considered in the present work. A statistical analysis of the results are carried out to identify the statistical significant between the results of comparative algorithms. The effect of various constraint handling techniques on the performance of the algorithms are also identify and presented. A set of the alternative solutions for the minimum energy requirement are obtained for the best algorithm and presented. The solutions for the different number of pump in operation for best performing algorithm are also obtained and presented. Finally, the convergence of the considered algorithm in obtaining the minimum energy solutions are presented and discussed.

Thermodynamic analysis of ejector-assisted vapour compression–absorption hybrid refrigeration system

Abstract: The vapour compression–absorption hybrid refrigeration system (VCAHRS) is a potential alternative refrigeration technology as it economises the use of energy resources. The main issues observed wit...