Experimental investigation and numerical modelling on the performance assessments of evacuated U – Tube solar collector systems

B. Kiran Naik, Mrinal Bhowmik, P. Muthukumar*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

In this paper, an experimental investigation for predicting the performance of evacuated U – tube solar collector is presented. A simplified numerical model is developed for predicting the working fluid outlet temperature of a single evacuated U – tube solar collector and also for the whole solar collector system. The model predictions are compared with the experimental data and noticed a good agreement exists between them. It is observed from the experimental and numerical analyses that evacuated U – tube solar collector manifolds connected in series provides higher temperature rise of working fluid at higher solar intensities and lower working fluid inlet temperatures and flow rates. The working fluid transition time in an evacuated U – tube solar collector is defined for analysing the time taken by a working fluid to attain a steady state condition. Based on experimental analysis, three empirical correlations for predicting working fluid transition time, energy efficiency and exergy efficiency are developed as the function of operating parameters and ambient temperature. Data predicted from these correlations match with the experimental data with maximum errors of ±12.7%, ±6.9% and ±7.8% for working fluid transition time, energy efficiency and exergy efficiency of an evacuated U – tube solar collector, respectively.

Original languageEnglish
Pages (from-to)1344-1361
Number of pages18
JournalRenewable Energy
Volume134
DOIs
Publication statusPublished - 2019 Apr
Externally publishedYes

Keywords

  • Energy efficiency
  • Evacuated U tube solar collector
  • Exergy efficiency
  • Thermal model
  • Transition time

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment

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