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Experimental and analytic study of a hybrid solar/biomass rural heating system

Author

Listed:
  • Zhang, Xinghui
  • Yang, Jiaojiao
  • Fan, Yi
  • Zhao, Xudong
  • Yan, Ruimiao
  • Zhao, Juan
  • Myers, Steve

Abstract

This paper presents a dedicated analytic and experimental study of a hybrid solar/biomass space heating system incorporating a micro-channel solar thermal panels-array, a biomass boiler and a dedicated control algorithm. This system enables the smart and joint use of solar and biomass energies to provide a comfortable indoor environment. The in-situ testing of the system was undertaken and the data obtained from the testing were analysed using Grubbs method to formulate the experimental thermal efficiency equation for the solar panels-array and the heat conversion factor equation for the combined heat storage/exchanging water tank. The annual energy performance of the hybrid system was investigated using a professional building energy simulation program (EnergyPlus), which can predict the heat load profile of house, the ratio of energy usage from solar/biomass sources and the primary energy/exergy efficiencies. The thermal efficiency of the solar thermal panels-array is in the range of 60%–70%. The heat storage water tank has a heat conversion factor in the range of 0.94–0.98. The heat load index per unit area is 46.86 W/m2 and cumulative heating energy consumption with 100 m2 house is 24.3 GJ during a heating season. The total annual energy demand of the solar/biomass heating system is around 35.91 GJ, of which the sun provides 63.31% and biomass provides 36.69%. The primary energy and exergy efficiencies of the solar/biomass rural heating system are 67.66% and 16.17% respectively. However, when the total input electrical exergy is traced back to its primary energy source, i.e. a coal-fired power plant, the exergy efficiency falls from 23.14% to 7.27%. Compared to the traditional primary energy supply system, the energy conversion effect and effective utilization degree of the solar/biomass heating system are relatively higher.

Suggested Citation

  • Zhang, Xinghui & Yang, Jiaojiao & Fan, Yi & Zhao, Xudong & Yan, Ruimiao & Zhao, Juan & Myers, Steve, 2020. "Experimental and analytic study of a hybrid solar/biomass rural heating system," Energy, Elsevier, vol. 190(C).
  • Handle: RePEc:eee:energy:v:190:y:2020:i:c:s0360544219320870
    DOI: 10.1016/j.energy.2019.116392
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    2. Chen, Heng & Xue, Kai & Wu, Yunyun & Xu, Gang & Jin, Xin & Liu, Wenyi, 2021. "Thermodynamic and economic analyses of a solar-aided biomass-fired combined heat and power system," Energy, Elsevier, vol. 214(C).

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