Analytical Characteristic Equation of N Identical Evacuated Tubular Collectors Integrated Double Slope Solar Still

2017 ◽  
Vol 139 (5) ◽  
Author(s):  
Desh B. Singh ◽  
Gopal N. Tiwari
Keyword(s):  
Characteristic Equation ◽  
Climatic Condition ◽  
Solar Still ◽  
Balance Equations ◽  
Analytical Characteristic ◽  
Compound Parabolic Concentrator ◽  
Energy And Exergy ◽  
Daily Energy ◽  
Analytical Result ◽  
Basin Area

In this paper, analytical expression for characteristic equation of double slope solar still (DS) included with series connected N identical evacuated tubular collectors (N-ETC-DS) has been developed. The derivation is based on fundamental energy balance equations for various components of the proposed system. The analytical result of the proposed N-ETC-DS has been compared with results reported by earlier researchers for the same basin area under similar climatic condition. It has been concluded that daily energy efficiency is higher by 23.90%, 26.45%, and 42.65% for N-ETC-DS than N identical partially covered photovoltaic thermal (PVT) compound parabolic concentrator collectors (CPC) integrated double slope solar still, N identical partially covered PVT flat plate collectors (FPC) integrated double slope solar still, and conventional double slope solar still (CDS), respectively, at 0.14 m water depth under optimized condition. Moreover, daily yield, exergy, energy and exergy efficiency have been computed.

Characteristic Equation Development for Single-Slope Solar Distiller Unit Augmented With N Identical Parabolic Concentrator Integrated Evacuated Tubular Collectors

2019 ◽  
Vol 142 (2) ◽  
Author(s):  
Rajeev Kumar ◽  
Rahul Sharma ◽  
Dharmendra Kumar ◽  
Ajay R. Singh ◽  
Desh B. Singh ◽  
...  
Keyword(s):  
Flat Plate ◽  
Characteristic Equation ◽  
Energy Input ◽  
Mean Value ◽  
Energy Output ◽  
Net Energy ◽  
Solar Still ◽  
The Mean ◽  
Flat Plate Collector ◽  
Basin Area

Abstract In this communication, characteristic equation for single-slope solar still augmented with N alike parabolic concentrator integrated evacuated tubular collectors has been developed which is also valid for N alike evacuated tubular collectors integrated single-slope solar distiller unit as well as passive single-slope solar distiller unit. The developed equation is similar in the form to Hottel-Whillier-Bliss equation which was developed for flat plate collector. The analytical equation development for the proposed system involves the writing of equations for its different components on the ground of equating net energy input to net energy output. The results obtained for the proposed system have been compared with the results of N alike evacuated tubular collectors integrated single-slope solar distiller unit and passive single-slope solar distiller unit. It has been concluded that the mean value of instantaneous efficiency for N alike parabolic concentrator integrated evacuated tubular collectors is higher by 42.86% and 50.82%; daily generation of freshwater is higher by 49.73% and 74.34%; and daily exergy is higher by 78.71% and 93.35% than the corresponding values for N alike evacuated tubular collector integrated single-slope solar distiller unit and passive single-slope solar distiller unit for the same basin area in that order.

scholarly journals Performance analysis of basin-type vertical multiple-effect diffusion solar still integrated with solar pond: energy, exergy and economical analysis

2021 ◽  
Author(s):  
Gurprinder Singh Dhindsa ◽  
Madhup Kumar Mittal ◽  
Gurpreet Singh Sokhal ◽  
Kamaljit Singh Sokhal ◽  
Nima Khalilpoor ◽  
...  
Keyword(s):  
Flow Rate ◽  
Exergy Efficiency ◽  
Feed Water ◽  
Feed Flow Rate ◽  
Solar Still ◽  
Batch Mode ◽  
Multiple Effect ◽  
Solar Pond ◽  
Energy And Exergy ◽  
Daily Energy

Abstract An experimental analysis was carried out with basin-type vertical multiple-effect diffusion solar still coupled with solar pond (BVMEDS-SP) to evaluate 24 hours overall performance of still by varying feed flow rate and temperature in addition to other affecting parameters. A solar pond was utilized to harness solar energy diurnal and the same energy was provided to basin water nocturnal in batch mode to produce distillate throughout the day. It can be seen that the daily energy and exergy performance of BVMEDS-SP having four effects was improved by 21.74% and 16.83%, respectively, when the feed flow rate was reduced from 0.32 g/m2/s to 0.13 g/m2/s. As the temperature of feed water was enhanced from 25.65°C to 32.4°C, the daily energy and exergy efficiency of BVMEDS-SP correspondingly increased by 41.76% and 46.62%. In addition, increasing the number of effects from 2 to 5 improved the overall energy and exergy efficiency to 93.15% and 171.80%, respectively. The cost analysis revealed that cost of distillate for 2-effect still was Rs. 4.64/kg and it reduced to Rs. 3.11/kg for 7-effect still. A productivity correlation was furthermore developed and estimated that the experimental database of current research was in good agreement with the error band of −5% to +10%.

scholarly journals Performance Improvements of Hemispherical Solar Still Using Internal Reflector: Energy and Exergy Analysis

2021 ◽  
Author(s):  
Mohammed El Hadi Attia ◽  
Muthu Manokar Athikesavan ◽  
Murugan Kaliyamoorthy ◽  
Guruprasad Balachandran ◽  
Syed Jafar Kutbudeen ◽  
...  
Keyword(s):  
Evaporation Rate ◽  
Exergy Analysis ◽  
Distilled Water ◽  
Water Production ◽  
Aluminium Foil ◽  
Solar Still ◽  
Performance Improvements ◽  
Energy And Exergy ◽  
Daily Energy ◽  
Energy And Exergy Analysis

Abstract Various scientists are looking for effective and easy solutions for augmentation of yield from the Hemispherical Solar Still (HSS). In this study, aluminium foil-sheet was used to reflect the intensity hence augments the evaporation rate and daily yield. Experimentations were conducted on two SS: the first SS is HSS; the second SS is HSS with reflective aluminium foil-sheet walls (HSS-RAFW). The highest distilled water production from the HSS, HSS-RAFW are 3.36 and 4.1 kg/m2, respectively. Compared to the HSS, the yield of distilled water was augmented by 22.21% when using the HSS- RAFW. The daily energy and exergy efficiency (EnE and ExE) of the HSS is 26.27 and 1.04%, respectively and daily EnE and ExE of the HSS-RAFW is 32.75 and 1.71%, respectively.

Analytical characteristic equation of N identical evacuated tubular collectors integrated single slope solar still

2017 ◽  
Vol 88 ◽  
pp. 41-51 ◽  
Author(s):  
D.B. Singh ◽  
V.K. Dwivedi ◽  
G.N. Tiwari ◽  
Navneet Kumar
Keyword(s):  
Characteristic Equation ◽  
Solar Still ◽  
Analytical Characteristic

Calculation of Hourly Output of a Solar Still

1993 ◽  
Vol 115 (4) ◽  
pp. 231-236 ◽  
Author(s):  
V. B. Sharma ◽  
S. C. Mullick
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Heat Balance ◽  
Solar Still ◽  
Balance Equations ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Hourly Output ◽  
The Heat Balance

An approximate method for calculation of the hourly output of a solar still over a 24-hour cycle has been studied. The hourly performance of a solar still is predicted given the values of the insolation, ambient temperature, wind heat-transfer coefficient, water depth, and the heat-transfer coefficient through base and sides. The proposed method does not require graphical constructions and does not assume constant heat-transfer coefficients as in the previous methods. The possibility of using the values of the heat-transfer coefficients for the preceding time interval in the heat balance equations is examined. In fact, two variants of the basic method of calculation are examined. The hourly rate of evaporation is obtained. The results are compared to those obtained by numerical solution of the complete set of heat balance equations. The errors from the approximate method in prediction of the 24-hour output are within ±1.5 percent of the values from the numerical solution using the heat balance equations. The range of variables covered is 5 to 15 cms in water depth, 0 to 3 W/m2K in a heat-transfer coefficient through base and sides, and 5 to 40 W/m2K in a wind heat-transfer coefficient.

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