scholarly journals A Research on Solar Greenhouse Dryer

2019 ◽  
Vol 8 (2S11) ◽  
pp. 4085-4088
Keyword(s):  
Solar Cycle ◽  
Tunnel Drier ◽  
Sun Drying ◽  
Solar Greenhouse

For taking away the humidity material drying procedure is achieved. Evolution of roof variety, particularly, solar cycle drier kayak drier solar tunnel drier, and greenhouse sprays length research workers have learned greenhouse drier. Inside this newspaper drier below convection variety and convection sort have been all studied. Greenhouse drier provides rather large excellent product compared to sun drying that is open plus the harvest declines are reduced by it. It's been discovered that the use of rainwater drier below convection lessens moisture material in addition to drying speed is rapid and comparative humidity is significantly less than convection manner.

scholarly journals Drying characteristics and prediction of best fitted drying model for coriander leaves

2021 ◽  
pp. 243-251
Author(s):  
Sanjay Kumar Singh ◽  
Samsher ◽  
B.R. Singh ◽  
R.S. Senger ◽  
Pankaj Kumar ◽  
...  
Keyword(s):  
Removal Rate ◽  
Drying Methods ◽  
Moisture Removal ◽  
Drying Time ◽  
Sun Drying ◽  
Potassium Metabisulphite ◽  
Solar Greenhouse ◽  
Drying Models ◽  
Drying Model ◽  
Coriander Leaves

Drying experiments were conducted on coriander leaves as affected by drying methods (solar greenhouse drying and open sun drying), pretreatments (dipping in a solution of magnesium chloride + sodium bicarbonate + potassium metabisulphite, boiled water blanching containing sodium metabisulphite, and untreated), and loading densities (2.0, 2.5 and 3.0 kg/m2). Validity of three commonly used drying models were examined to predict the most suitable drying model for coriander leaves. The increased drying temperature under solar greenhouse dryer (42°C) increases the amount of moisture removal from the coriander leaves and reduces the drying time by increasing the drying rate as compared to open sun drying (29°C), at all the selected levels of pretreatments and loading densities. Chemically treated coriander leaves dehydrated under a solar greenhouse dryer required less drying time than other treated leaves and dried leaves. Nevertheless, drying methods and loading densities had significant effects, while treatment effects were marginal. It was found that reduction of moisture and moisture removal rate per unit time occurred mostly in the falling rate period except some accelerated removal of moisture at the beginning up to 150 minutes. Page's model was found most appropriate for drying coriander leaves among the selected models.

scholarly journals Comparative Study between Modified Solar Dryer and Open Sun Drying for Drying of Onion Slices

2021 ◽  
pp. 23-29
Author(s):  
P. Sivamma ◽  
E. Mounika ◽  
K. Carolin Rathinakumari ◽  
G. Senthil Kumaran ◽  
B. Bindu
Keyword(s):  
Solar Energy ◽  
Moisture Content ◽  
Temperature Difference ◽  
Initial Moisture Content ◽  
Ambient Condition ◽  
Maximum Temperature ◽  
Maximum Temperature Difference ◽  
Sun Drying ◽  
Solar Dryer ◽  
Solar Greenhouse

Solar greenhouse drying is a method of removing moisture from the food material in which drying medium is solar energy which is easily available and low in cost for farmers. The solar energy is decreases in the monsoon months in comparison to non-monsoon months. The decrease in the solar energy results in lower temperatures in the solar greenhouse dryer. The aluminium foil which has 88% reflectivity, reflects the radiation inside solar greenhouse dryer and heats the air inside dryer and maintains heat for longer times.Aluminium foil was applied on eastern, western and southern walls of the dryer and the parameters viz; temperature and relative humidity were recorded in both modified solar greenhouse dryer, solar greenhouse dryer and ambient conditions. Assessment of temperature in ambient condition, solar greenhouse dryer with and without modification showed the maximum temperature difference between solar greenhouse dryer without modification and ambient condition was about 11.5°C whereas 17.5°C maximum temperature difference between modified solar greenhouse dryer and ambient condition. The dryer was able to reduce moisture content of onion from initial moisture content of 679 per cent dry basis to 5.7 per cent in 31 h of drying whereas the traditional sun drying was able to reduce moisture content of onion from initial moisture content of 679 per cent dry basis to 29 per cent in 31 h of drying time. The results showed a considerable advantage of solar dryer over the traditional open sun drying method in term of drying rate and less risk for spoilage.

Calculated Coronal Magnetic Fields and Their Comparison with the Coronal Structures as Observed during Five Solar Eclipses

1994 ◽  
Vol 144 ◽  
pp. 559-564
Author(s):  
P. Ambrož ◽  
J. Sýkora
Keyword(s):  
Magnetic Field ◽  
Solar Cycle ◽  
Magnetic Fields ◽  
Solar Corona ◽  
Coronal Magnetic Field ◽  
Coronal Magnetic Fields ◽  
Solar Eclipses ◽  
Coronal Structures

AbstractWe were successful in observing the solar corona during five solar eclipses (1973-1991). For the eclipse days the coronal magnetic field was calculated by extrapolation from the photosphere. Comparison of the observed and calculated coronal structures is carried out and some peculiarities of this comparison, related to the different phases of the solar cycle, are presented.

The Hemispheric Sign Rule of Current Helicity during the Rising Phase of Cycle 23

2000 ◽  
Vol 179 ◽  
pp. 303-306
Author(s):  
S. D. Bao ◽  
G. X. Ai ◽  
H. Q. Zhang
Keyword(s):  
Solar Cycle ◽  
Southern Hemisphere ◽  
Northern Hemisphere ◽  
Active Regions ◽  
Hemispheric Preference ◽  
Current Helicity

AbstractWe compute the signs of two different current helicity parameters (i.e., αbestandHc) for 87 active regions during the rise of cycle 23. The results indicate that 59% of the active regions in the northern hemisphere have negative αbestand 65% in the southern hemisphere have positive. This is consistent with that of the cycle 22. However, the helicity parameterHcshows a weaker opposite hemispheric preference in the new solar cycle. Possible reasons are discussed.

Prominences and Solar Activity

1979 ◽  
Vol 44 ◽  
pp. 357-372
Author(s):  
Z. Švestka
Keyword(s):  
Solar Activity ◽  
Solar Cycle ◽  
List Type ◽  
Type Number ◽  
Flare Loops ◽  
Filament Activation

The following subjects were discussed:(1)Filament activation(2)Post-flare loops.(3)Surges and sprays.(4)Coronal transients.(5)Disk vs. limb observations.(6)Solar cycle variations of prominence occurrence.(7)Active prominences patrol service.Of all these items, (1) and (2) were discussed in most detail and we also pay most attention to them in this report. Items (3) and (4) did not bring anything new when compared with the earlier invited presentations given by RUST and ZIRIN and therefore, we omit them.

NUMERICAL STUDY OF A SOLAR GREENHOUSE DRYER WITH A PHASE-CHANGE MATERIAL AS AN ENERGY STORAGE MEDIUM

2018 ◽  
Vol 49 (6) ◽  
pp. 509-528 ◽  
Author(s):  
Orawan Aumporn ◽  
Belkacem Zeghmati ◽  
Xavier Chesneau ◽  
Serm Janjai
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Phase Change Material ◽  
Numerical Study ◽  
Storage Medium ◽  
Solar Greenhouse ◽  
Change Material

Regression Analysis of Sunspot Numbers for the Solar Cycle 24 in Comparison to Previous Three Cycles

2014 ◽  
Vol 4 (2) ◽  
pp. 477-483
Author(s):  
Debojyoti Halder
Keyword(s):  
Regression Analysis ◽  
Solar Cycle ◽  
Sunspot Number ◽  
The Sun ◽  
Sunspot Numbers ◽  
Solar Cycle 24 ◽  
Current Cycle ◽  
Cycle 24

Sunspots are temporary phenomena on the photosphere of the Sun which appear visibly as dark spots compared to surrounding regions. Sunspot populations usually rise fast but fall more slowly when observed for any particular solar cycle. The sunspot numbers for the current cycle 24 and the previous three cycles have been plotted for duration of first four years for each of them. It appears that the value of peak sunspot number for solar cycle 24 is smaller than the three preceding cycles. When regression analysis is made it exhibits a trend of slow rising phase of the cycle 24 compared to previous three cycles. Our analysis further shows that cycle 24 is approaching to a longer-period but with smaller occurrences of sunspot number.

Effect of different rotation systems on media nutrient and enzyme activity in solar greenhouse tomato rhizosphere

2013 ◽  
Vol 21 (6) ◽  
pp. 681-688
Author(s):  
Yan-Xia MA ◽  
Jing REN ◽  
Gang CAO ◽  
Wen-Lin LI ◽  
Guo-Bin ZHANG ◽  
...  
Keyword(s):  
Enzyme Activity ◽  
Greenhouse Tomato ◽  
Solar Greenhouse
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