scholarly journals Determination of Optimal Angles of Solar Panels for Satisfied Time Intervals on the Territory of Ukraine

2021 ◽  
pp. 47-52
Author(s):  
Tetiana Rymar ◽  
Myron Kuzyk
Keyword(s):  
Functional Relationship ◽  
Solar Panels ◽  
The South ◽  
Time Intervals ◽  
Optimal Angle ◽  
Analytical Expression ◽  
Arbitrary Time

The results of determining the optimal angles of inclination to the horizon of flat solar panels with a constant orientation to the south are presented. An analytical expression is obtained, which describes the dependence of the optimal angles for time intervals symmetric with respect to July 1 on their duration in months. The parameters of this expression are set for several cities of Ukraine. A method for determining (estimating) the optimal angles of inclination for arbitrary time intervals, except for those in the range of November-February. It was shown that for symmetric relatively summer (July 1) and relatively winter (January 1) intervals there is a certain functional relationship between the value of the optimal angle βopt. and the duration of intervals in months. For summer and winter months, these dependences are described by polynomials of the 2nd order, which makes it possible to determine βopt. for arbitrary time intervals of the mentioned symmetry.

scholarly journals PENENTUAN KEMIRINGAN SUDUT OPTIMAL PANEL SURYA

2018 ◽  
Vol 3 (5) ◽  
Author(s):  
T. M. Aziz Pandria ◽  
Mukhlizar Mukhlizar
Keyword(s):  
Renewable Energy ◽  
Solar Radiation ◽  
Tilt Angle ◽  
Solar Panels ◽  
Optimal Angle ◽  
Tilted Surface ◽  
Simulation Calculation ◽  
Fixed Type ◽  
Technical Study

This paper discusses the determination of the optimal tilt angle of solar panels in the Nagan Raya aims to maximize acceptance of solar radiation. Adjust the titl angle customized panels with latitude location can maximize the acceptance of solar radiation. Calculation of the optimal angle variations is simulated at an angle of 10 – 50 intervals between angle 10. For the purposes of simulation calculation of optimal tilt angle against the value-based maximum radiation on tilted surface, use data that NASA SEE. A study conducted in Nagan Raya this is determined based on the google maps coordinates of the point. This research resulted in recommendations for the optimum tilt angle in Nagan Raya who was the tilt 40 with South-facing orientation. The results of the technical study of this research can be used as initial references against the installation of a solar panel fixed type in the Nagan Raya.Keywords: Optimum angle, Solar panels, NASA SSE, Nagan Raya, Renewable Energy

A DETERMINATION OF THE AMOUNT OF VITAMIN C IN SOME MEDICAL PLANTS GROWING IN THE SOUTH– WESTERN ZARAFSHAN MOUNTAIN RANGES

2018 ◽  
pp. 48-49
Author(s):  
P. Mirkhamidova ◽  
U. E. Khujanazarov ◽  
D. A. Mamatqulov ◽  
S. Ziyamukhamedova ◽  
G. I. Mukhamedov
Keyword(s):  
Vitamin C ◽  
The South ◽  
Mountain Ranges ◽  
Medical Plants

Quantitative and Qualitative Characteristics of Urban Discharge to Small River Basins in the South West of Sweden

1983 ◽  
Vol 14 (3) ◽  
pp. 155-166 ◽  
Author(s):  
Wm. Hogland ◽  
R. Berndtsson
Keyword(s):  
River Basins ◽  
Small River ◽  
The South ◽  
Time Intervals ◽  
Qualitative And Quantitative ◽  
South West ◽  
Quantitative Characteristics ◽  
Qualitative Characteristics ◽  
Qualitative And Quantitative Characteristics

The paper deals with the qualitative and quantitative characteristics of urban discharge. Ratios for urban discharge and recipient flow during different time intervals are presented and discussed. The quality of the urban discharge is illustrated through pollutographs.

scholarly journals Estimating the Effect of Fractal Dimension on Representative Elementary Volume of Randomly Distributed Rock Fracture Networks

Geofluids ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Jing Zhang ◽  
Liyuan Yu ◽  
Hongwen Jing ◽  
Richeng Liu
Keyword(s):  
Fractal Dimension ◽  
Functional Relationship ◽  
Rock Fracture ◽  
Representative Elementary Volume ◽  
Width Ratio ◽  
Elementary Volume ◽  
Equivalent Permeability ◽  
Length Width ◽  
Rock Fracture Networks

The effect of fractal dimension (Df) on the determination of representative elementary volume (REV) was investigated through numerical experimentations, in which a new method was adopted to extract submodels that have different length-width ratios from original discrete facture networks (DFNs). Fluid flow in 1610 DFNs with different geometric characteristics of fractures and length-width ratios was simulated, and the equivalent permeability was calculated. The results show that the average equivalent permeability (KREV) at the REV size for DFNs increases with the increase in Df. The KREV shows a downward trend with increasing length-width ratio of the submodel. A strong exponent functional relationship is found between the REV size and Df. The REV size decreases with increasing Df. With the increment of the length-width ratio of submodels, the REV size shows a decreasing trend. The effects of length-width ratio and Df on the REV size can be negligible when Df≥1.5, but are significant when Df<1.5.

scholarly journals A STUDY INTO ICE BUILD-UP AND MELTING ON VERTICAL COOLED PIPES

2016 ◽  
Vol 52 (3) ◽  
Author(s):  
Y. Zasiadko ◽  
O. Pylypenko ◽  
A. Forsiuk ◽  
R. Gryshchenko
Keyword(s):  
Thermal Energy ◽  
Experimental Unit ◽  
Ice Thickness ◽  
Ice Melting ◽  
Empirical Correlations ◽  
Time Intervals ◽  
Ice Accumulation ◽  
Time Periods ◽  
Semi Empirical

The use of cold accumulators based on the principle of ice build up on the cooled surfaces during off-peak periods and ice melting during on-peak periods is an effective method of electricity bills reduction. Within comparatively short periods of on-peak demand a noticeable amount of thermal energy related to ice melting is to be released, it becomes clear that not only sizing of ice accumulators based on balance calculations is actual, but also the determination of time periods of ice accumulation becomes critical. This work presents experimental unit for obtaining data on the ice build-up on the vertical cooled pipes and later on to continuously register data on the ice thickness diminishing at the regimes of ice melting when cooling of pipe stops. The data for ice build-up and melting for some regimes have been presented and analyzed. The data form the base for deriving semi-empirical correlations allowing to determine a time intervals necessary to generate of ice layers of a given thickness.

scholarly journals Herbaceous periwinkle, Vinca herbacea Waldst. et Kit. 1799 (Apocynaceae), a new species of the Croatian flora

2013 ◽  
Vol 72 (2) ◽  
pp. 399-406
Author(s):  
János Csiky ◽  
Dragica Purger
Keyword(s):  
New Species ◽  
Small Extent ◽  
Critically Endangered ◽  
The South ◽  
Plant Identification ◽  
Data Deficient ◽  
Number Of Individuals ◽  
A New Species

Abstract - Populations of herbaceous periwinkle, Vinca herbacea Waldst. et Kit., were found on April 2007 on Bansko Hill (Baranja, Croatia), which lies on the south-western edge of the range of this Pontic-Pannonian species. Since V. herbacea was included neither in the handbooks for plant identification nor in the current Croatian Flora Database, a new key for the determination of Vinca L. species of Croatia is presented herein. The herbaceous periwinkle should be treated as a critically endangered (CR) species in Croatia, considering the low number of individuals and the small extent of its occurrence in extremely rare habitats at the margin of its distribution. New recordings of some very rare or »data deficient « (DD) taxa of Croatia are also presented here: Scorzonera hispanica L. and Inula germanica L.

The versatility of the Bristow absorption tester – a review

2018 ◽  
Vol 33 (2) ◽  
pp. 279-296 ◽  
Author(s):  
Sami-Seppo Ovaska ◽  
Kaj Backfolk
Keyword(s):  
Special Focus ◽  
Print Quality ◽  
Substrate Roughness ◽  
Time Intervals ◽  
Absorption Properties ◽  
Liquid Absorption ◽  
Short Time ◽  
Printing Processes

Abstract This paper reviews the use of the Bristow Absorption Tester (known also as the Bristow wheel) in the characterization of fiber-based substrates. The Bristow wheel is a laboratory-scale instrument that has been designed for studying substrate wettability and dynamic liquid absorption properties in short time intervals, which are important in many converting and printing processes of paper and paperboard. The tester also gives information about substrate roughness. The Bristow wheel has shown great usefulness in predicting print quality especially in inkjet applications, in which a good correlation between print quality (letter area) and ink penetration rate has been found by several researchers. The apparatus is particularly useful in dynamic wetting studies, but it has also been successfully used in numerous other research purposes such as the determination of the degree of sizing, evaluation of material glueability, and various coatability studies. Modifications of both the testing principle and the tester structure have also been reported. These include e. g. equipping the apparatus with a corona unit that makes it possible to mimic a printing process on a relevant time-scale. This review summarizes the reported applications of Bristow wheel with a special focus on tester performance and versatility.

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