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Energy and exergy analyses on a novel hybrid solar heating, cooling and power generation system for remote areas

Author

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  • Zhai, H.
  • Dai, Y.J.
  • Wu, J.Y.
  • Wang, R.Z.

Abstract

In this study, a small scale hybrid solar heating, chilling and power generation system, including parabolic trough solar collector with cavity receiver, a helical screw expander and silica gel-water adsorption chiller, etc., was proposed and extensively investigated. The system has the merits of effecting the power generation cycle at lower temperature level with solar energy more efficiently and can provide both thermal energy and power for remote off-grid regions. A case study was carried out to evaluate an annual energy and exergy efficiency of the system under the climate of northwestern region of China. It is found that both the main energy and exergy loss take place at the parabolic trough collector, amount to 36.2% and 70.4%, respectively. Also found is that the studied system can have a higher solar energy conversion efficiency than the conventional solar thermal power generation system alone. The energy efficiency can be increased to 58.0% from 10.2%, and the exergy efficiency can be increased to 15.2% from 12.5%. Moreover, the economical analysis in terms of cost and payback period (PP) has been carried out. The study reveals that the proposed system the PP of the proposed system is about 18 years under present energy price conditions. The sensitivity analysis shows that if the interest rate decreases to 3% or energy price increase by 50%, PP will be less than 10 years.

Suggested Citation

  • Zhai, H. & Dai, Y.J. & Wu, J.Y. & Wang, R.Z., 2009. "Energy and exergy analyses on a novel hybrid solar heating, cooling and power generation system for remote areas," Applied Energy, Elsevier, vol. 86(9), pages 1395-1404, September.
  • Handle: RePEc:eee:appene:v:86:y:2009:i:9:p:1395-1404
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    References listed on IDEAS

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