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Exergy Analyses of Fabricated Compound Parabolic Solar Collector with Evacuated Tubes at Different Operating Conditions: Indore (India)

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Abstract

In this research work, compound parabolic solar collector (CPC) with evacuated tubes is fabricated. Main benefit of CPC is that there is no requirement of solar tracking system. With fabricated CPC; outlet temperatures of flowing fluid, instantaneous efficiencies, useful heat gain rates and inlet exergies (with and without considering Sun’s cone angle) are experimentally found. Observations are taken at different time intervals (1200, 1230, 1300, 1330 and 1400 h), mass flow rates (1.15, 0.78, 0.76, 0.86 and 0.89 g/s), ambient temperatures and with various dimensions of solar collector. This research work is concluded as; maximum instantaneous efficiency is 69.87% which was obtained with 0.76 g/s flow rate of water at 1300 h and 42°C is the maximum temperature difference which was also found at same time. Maximum inlet exergies are 139.733 and 139.532 kW with and without considering Sun’s cone angle at 1300 h, respectively. Best thermal performance from the fabricated CPC with evacuated tubes is found at 1300 h. Maximum inlet exergy is 141.365 kW which was found at 1300 h with 0.31 m aperture width and 1.72 m absorber pipe length.

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Abbreviations

Aea :

Effective aperture area, m2

Asa :

Surface area of absorber pipe, m2

AF:

Absorbed flux, W/m2

Baperture :

Aperture width, m

Cp :

Specific heat for flowing fluid, J/kg K

D0 :

Outer diameter of absorber pipe, m

Ibrb :

Instantaneous/hourly beam radiation on a surface, W/m2

Lpipe :

Characteristic length of pipe, m

mfluid :

Mass flow rate of flowing fluid, kg/s

Qr :

Heat transfer rate, W

t1, t2 :

Inlet and outlet fluid temperatures, K

t5 :

Ambient temperature, K

α:

Absorbtivity of the pipe material

γ:

Intercept factor

ηinst :

Instantaneous efficiency, %

ρ:

Specular reflectivity on the concentrator surface

τ:

Transmissivity of the pipe material

φ:

Sun’s cone angle, degree

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Authors and Affiliations

  1. Sushila Devi Bansal College of Technology, Indore, 453331, Madhaya Pradesh, India

    Ankur Geete, Akash Dubey, Ankush Sharma & Anshul Dubey

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  1. Ankur Geete
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  2. Akash Dubey
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Correspondence to Ankur Geete.

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Geete, A., Dubey, A., Sharma, A. et al. Exergy Analyses of Fabricated Compound Parabolic Solar Collector with Evacuated Tubes at Different Operating Conditions: Indore (India). J. Inst. Eng. India Ser. C 100, 455–460 (2019). https://doi.org/10.1007/s40032-018-0455-5

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