Values Of Direct Solar Radiation Research Articles

Impact of Meteorological Parameters on Solar Radiation over Langtang National Park, Nepal

The main objective of this research is to study the impact of meteorological parameters on atmospheric turbidity index on Langtang National Park (28.2112° N, 85.5663° E, 3862 m asl) for a period of one year (2018). Daily data of Aerosol optical depth (AOD) and meteorological parameters are obtained from AERONET and NASA website respectively. The maximum and minimum values of direct solar radiation (IB) during the study period are found 1286 ± 24 W/m2 in January and 1123 ± 3 W/m2 in August respectively. The maximum and minimum value of diffuse solar radiation (ID) is found 119 ± 21 W/m2 in April and 59 ± 2 W/m2 in August respectively. The annual average of direct solar radiation and diffuse solar radiation are found 1202 ± 63 W/m2 and 90 ± 20 W/m2 respectively. There is a negative effect of maximum temperature, minimum temperature, dew point, relative humidity, water contend and rainfall on IB, but no significant effect of those parameters on ID. The result of this research work is beneficial for the further identification, impact and analysis of solar radiation at different places with same geographical and meteorological condition. The study of solar radiation is important for energy harvesting and agriculture.

Studying the Changes in Solar Radiation and Their Influence on Temperature Trend in Iraq for a Whole Century

Most studies indicated that the values ​​of atmospheric variables have changed from their general rates due to pollution or global warming etc. Hence, the research indicates the changes of direct solar radiation values ​​over a whole century i.e. from 1900 to 2000 depending on registered data for four cities, namely (Mosul - Baghdad - Rutba - Basra. Moreover, attemptsto correlate the direct solar radiation with the temperature values have been ​​recorded over that period. The results showed that there is a decreasing pattern of radiation quantities over time throughout the study period, where the value of direct radiation over the city of Baghdad 5550 w/m2 was recorded in the year 1900, but this ratio decreased clearly to approximately 5400 w/m2 in the year 2000, which is perhaps due to the increase of general pollution rates in the atmosphere. The results also showed that the city of Rutba recorded the highest annual rate of radiation quantities, and Baghdad with Mosul recorded the lowest radiation ratios compared to the rest of the cities, in addition to that there was a large convergence of radiation ratios between them to some extent. The results showed that there is a sharp drop in radiation ratios, specifically in the years1980and 1990. As for the extent of the relationship for solar radiation with temperature levels throughout the study period, it was found that there is an inverse relationship between them, and this confirms that the cause of high temperatures is not because of increased solar radiation, but it may rather due to other reasons such as increased greenhouse gases.

Assessing the applicability of various climatic zoning methods for building construction: Case study from the extreme southern part of Chile

This study presents the results of the assessment of current climatic zoning for building construction in two regions in the extreme southern part of Chile. The simulation of heating energy consumption for a detached single-family dwelling was performed in 680 geographical locations in the study area. The dwelling, which complied with all the technical energy efficiency policies of the country, exhibited an oscillation of heating energy consumption in a range of 75–300 kWh/m2/year. The possibility of using bioclimatic zoning and zoning based on cluster analysis was assessed to determine the main parameters that might affect climatic zoning for residential buildings. The study revealed possible optimal parameters for the development of a new zoning system in the study area, namely: (i) level of heating energy consumption based on simulation in diverse geographical locations, (ii) climatic values of heating degree-days, and (iii) climatic values of direct solar radiation.

Photochemical ozone production in the convective mixed layer, studied with a tethered balloon sounding system

In 1987, 1988, and 1990, four measuring campaigns with a tethered balloon sounding system were performed in a semirural area in Belgium to study the ozone distribution in the boundary layer in relation to meteorological parameters, during episodes of photochemical ozone production in the convective mixed layer. The detailed profiles of the ozone concentration between sunrise and sunset were used for a calculation of the change rate of the ozone column density in the boundary layer. These values allowed us to determine for the first time the integrated ozone production rates in the convective mixed layer, making use of a simplified form of the continuity equation of ozone mass. From all the measuring campaigns a range of integrated ozone production rates from 0 to 9 μg m−2 s−1 was found. Peak values of the ozone production rate were observed when the direct solar radiation intensity rises for the first time in the course of a day to about 400 W m−2 before noon. The upper envelope of a scatterplot of all ozone production rates as a function of the direct solar radiation shows a linear course up to about 650 W m−2. Beyond this value the intensity of direct solar radiation is no longer a rate‐limiting factor in the photochemical ozone production process in the boundary layer; under these conditions the ozone production is limited by the supply rate of hydrocarbons. In general, the measured ozone production rates also show an increase with increasing ambient temperatures. At temperatures larger than 24°C the integrated net ozone production rate during the campaigns was always at least 3 μg m−2 s−1 when the direct solar radiation values were larger than 350 W m−2 . The surface ozone deposition velocity at the site of the campaigns was determined from the ozone data through an indirect method that does not require any parameterization of the vertical ozone flux; at daylight conditions an upper limit of 1.4 cm s−1 was found.

Solar radiation reduction by water and dust in the Area of Thessaloniki

In the present work, an attempt is made to present the realistic condition of the atmosphere over the city of Thessaloniki by comparing the direct solar radiation reaching the city centre with the solar radiation reaching the rural areas. The comparison is made possible by making use of the values of direct solar radiation and of turbidity factors, such as the Linke turbidity factor Tg or the Angstrom turbidity coefficient β. The values of direct solar radiation which were measured inside the city were significantly lower than the ones measured out in the rural area. It has been found that the direct solar radiation in the city exhibits a reduction of the order of 10–20%. The reduced values of direct solar radiation measured inside the city are sometimes due to the increased concentration of dust particles and sometimes due to the increased quantities of water vapour coming from Thermaikos bay and diffused in the atmosphere.

Solar radiation measurements and studies of atmospheric transmission at high altitude stations in India

Results of radiation measurements made at high altitude stations in the Himalayas and other locations in India have been studied. The values of direct solar radiation at stations in Kashmir during the pre-monsoon summer months are exceptionally low and lower than those at Kodaikanal in spite of low atmospheric humidity. Such exceptionally low values of direct solar radiation observed in Kashmir have to be attributed to the thick layer of aerosols over most of north India during the summer months. Values of atmospheric turbidity were found to be comparatively high over the Himalayas. Spectral measurements of direct solar radiation as well as global and diffuse solar radiation at the high altitude stations have been discussed.

Solar radiation climate of India

This paper presents the essential results of solar radiation measurements made at a network of thirteen stations in India during the last ten years. The basic records are of total integral wavelength global solar radiation and sky radiation on a horizontal surface, and of direct solar radiation and its spectral components, defined by the wavelength intervals λ < 525, 525–630, λ < 630, 525–710 and λ < 710 nm. Values of direct solar radiation at normal incidence and on horizontal and vertical surfaces have also been calculated from continuous records of the global and sky radiation on a horizontal surface at all 13 stations. The spatial and seasonal variations of direct solar radiation, global solar, and sky radiation are discussed. Results are also presented of special direct solar observations made at a few high altitude stations in Kashmir in 1969.

Interrelationships between total, direct, and diffuse solar radiation in the tropics

Formulas that directly yield intensities of direct and diffuse radiation on horizontal surfaces from measurements of hourly total radiation only have been developed. Alternatively, atmospheric turbidity and solar altitude can also yield similar results. These formulas result in obtaining relations similar to those given by Parmelee from data collected in the United States. The data for New Delhi have also been shown to agree with these correlations.Computed values of direct solar radiation on a horizontal surface or at normal incidence, are expressed by a mathematical expression that is shown to agree closely with the computed values obtained by Rao and Seshadri.Correlation between hourly direct and total transmission factors has been shown to depend on the solar altitude, in addition to the atmospheric turbidity.