Performance analysis of solar chimney for passive cooling of the building

The solar chimney is a passive device that is applied to enhance room ventilation. The chimney could be vertical or inclined. The chimney inclination angle and air inlet opening position are important parameters that greatly affects flow pattern and ventilation rate inside the room. In this study, the effect of air inlet opening position and chimney inclination angle on air change per hour and air flow pattern inside the room was numerically investigated. A numerical simulation using CFD code was used to predict flow pattern. Then the results were compared with published experimental measurements. Find out the effect of air inlet opening position and inclination angle of chimney on mass flow rate at outlet of the chimney

Exergy based analysis of triangular finned solar air heater

The present analytical study reports the effect of fin spacing, mass flow rate and isolation on exergy performance of triangular fin attached SAH. The primary objective of the work is to manifest the condition and parameter combinations that yield high values of exergy efficiency. A computer code has been developed in MATLAB R2016a. The numerical results of triangular fin SAH obtained are compared with that of plain SAH as a measure to evaluate the effectiveness of former over the latter. It is found that lower values of mass flow rate and fin spacing yields maximum exergy efficiency. Exergy efficiency drops continuously thereafter and at higher values of mass flow rate, the exergy efficiency drops even below the exergy efficiency of plain SAH

Experimental performance investigation of air heating solar collector with fins and twisted tapes

The current work outlines the experimental findings of an air heating solar collector integrated with fins and twisted tapes of twist ratio ‘Y=2.66’ for the range of air flow rate from 0.007 kg/s to 0.0158 kg/s. The effects air flow rates on the performance of this new design of the collector have been investigated. The outcomes have also been compared with those of the conventional solar air heater. The performance of the collector with fins and twisted tapes has been perceived to be improved substantially as compared to conventional solar air heater

Modeling of quadruple junction solar cell

Modeling involves realizing the mathematical model and extracting the parameters of a quadruple junction solar cell (which have obtained highest efficiencies according to the 2016 NREL efficiency data) like series and parallel resistances, ideality factor (ηi) etc using Genetic algorithm and modeling of the same in the MATLAB/SIMULINK environment using the different single junction solar cell models available and determining the efficiencies of each of the subcells. In this paper a four junction cell made of AlGaInP-GaAs-GaInAs-Ge which constitute the subcells of the Quad cell in the descending order of their bandgaps respectively, are modeled in Simulin

Mental Health Programme in India: Has the tide really turned?

Mental disorders in India form a major public health concern and the efforts to tackle these dates back to four decades, by way of the National Mental Health Programme (NMHP) and its operational arm, the District Mental Health Programme (DMHP). Although the progress of NMHP (and DMHP) was relatively slower till recently, the last 4-5 years have seen rapid strides with several initiatives, including (i) expansion of DMHPs to 90 per cent of the total districts of the country, (ii) the National Mental Health Policy and (iii) strengthening the Mental Health Legislation by way of providing explicit provisions for rights of persons with mental illnesses. Among others, factors responsible for this accelerated growth include the easily accessible digital technology as well as judicial activism. Federal and State cooperation is another notable feature of this expansion. In this review, the authors summarize the available information on the evolution of implementation and research aspects related to India's NMHP over the years and provide a case for the positive turn of events witnessed in the recent years. However, the authors caution that these are still baby steps and much more remains to be done