Experimental Studies on Receiving Surfaces of Flat Solar Collectors

2021 ◽  
Vol 57 (6) ◽  
pp. 715-720
Author(s):  
V. V. Kuvshinov ◽  
L. M. Abd Ali ◽  
N. V. Morozova ◽  
B. L. Krit ◽  
F. M. Al-Rufaee ◽  
...  
Keyword(s):  
Experimental Studies ◽  
Solar Collectors

scholarly journals Coverage of energy for the preparation of hot tap water by installing solar collectors in a singlefamily building

2018 ◽  
Vol 49 ◽  
pp. 00106
Author(s):  
Aleksander Starakiewicz
Keyword(s):  
Thermal Energy ◽  
Tap Water ◽  
Experimental Studies ◽  
Hot Water ◽  
Solar Collectors ◽  
Solar Panels ◽  
Final Energy ◽  
Outlet Valve ◽  
Higher Temperature ◽  
Measurement Period

The paper presents the results of experimental studies on the consumption of hot water, energy obtained from the solar installation in the production process and the degree of coverage of usable and final energy with solar collectors. Thermal energy measurements from solar collectors cover the measurement period from 2011 to 2017. During this period, the annual final energy obtained from solar collectors ranged from 1033-1576 kWh. Monthly and annual demand for usable and final energy for the demand for hot water is presented depending on the amount of hot water used. Monthly actual consumption of hot water in the measurement period ranged from 3.57-9.16 m3. During this period, the number of residents has changed from 3 to 5 people. Annual coverage of energy useful for heat and energy by solar panels in the years 2011-2017 fluctuated from 38.0%-63.9% and 25.2%-42.3% for final energy. Monthly energy coverage ranged from 5.5% to over 100%. Covering energy above 100% in practice means getting a higher temperature of hot water in the outlet valve than expected.

scholarly journals On the Correlation between the Geometrical Features and Thermal Efficiency of Flat-Plate Solar Collectors

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 261
Author(s):  
Waldemar Kuczynski ◽  
Kazimierz Kaminski ◽  
Pawel Znaczko ◽  
Norbert Chamier-Gliszczynski ◽  
Piotr Piatkowski
Keyword(s):  
Flat Plate ◽  
Thermal Efficiency ◽  
Experimental Studies ◽  
Solar Collectors ◽  
Performance Properties ◽  
Geometrical Features ◽  
And Performance

This article presents the results of numerical and experimental studies on the impacts of the selected geometrical features of liquid solar collectors on their thermal efficiency. The experiments were carried out while meeting the requirements of the ISO 9806:2017 standard. Selected changes in the geometrical features were analysed by using fully functional prototypes of modified solar collectors. The correlations between the design and performance properties of the solar collectors were determined in accordance with the changes in the shape of the thermal efficiency η(T*m) curve.

3-D reconstruction and analysis of mammalian mitotic spindle structure

1992 ◽  
Vol 50 (1) ◽  
pp. 578-579
Author(s):  
Kent McDonald ◽  
David Mastronarde ◽  
Rubai Ding ◽  
Eileen O'Toole ◽  
J. Richard McIntosh
Keyword(s):  
Cross Sections ◽  
Mitotic Spindle ◽  
Experimental Studies ◽  
Video Camera ◽  
Three Dimensions ◽  
Mitotic Spindles ◽  
Black And White ◽  
Reconstruction Methods ◽  
Spindle Structure ◽  
Tissue Culture Line

Mammalian spindles are generally large and may contain over a thousand microtubules (MTs). For this reason they are difficult to reconstruct in three dimensions and many researchers have chosen to study the smaller and simpler spindles of lower eukaryotes. Nevertheless, the mammalian spindle is used for many experimental studies and it would be useful to know its detailed structure.We have been using serial cross sections and computer reconstruction methods to analyze MT distributions in mitotic spindles of PtK cells, a mammalian tissue culture line. Images from EM negatives are digtized on a light box by a Dage MTI video camera containing a black and white Saticon tube. The signal is digitized by a Parallax 1280 graphics device in a MicroVax III computer. Microtubules are digitized at a magnification such that each is 10-12 pixels in diameter.

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