THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

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The study of a seasonal solar CCHP system based on evacuated flat-plate collectors and organic Rankine cycle

ABSTRACT
The demands of cooling, heating and electricity in residential buildings are varied with seasons. This article presented a seasonal solar CCHP system based on evacuated flat-plate collectors (EFPCs) and organic Rankine cycle (ORC). The heat collected by EFPCs is used to drive the ORC unit in spring, autumn and winter, and drive the double-effect LiBr absorption chiller in summer. The ORC condensation heat is used to yield hot water in spring and autumn, whereas supply heating in winter. The system thermodynamic performance was analyzed. The results show that the system thermal efficiency in spring, autumn and winter (ηsys,I) increases as ORC evaporation temperature (T6) and EFPC outlet temperature (T2) decrease. The maximum ηsys,I of 67.0% is achieved when T6=80°C and T2=100°C. In summer, the system thermal efficiency (ηsys,II) increases first and then decreases with the increment of T2. The maximum ηsys,II of 69.9% is obtained at T2 =136°C. The system output performance in Beijing and Lanzhou is better than that in Hefei. The average output power, heating capacity, hot water and cooling capacity are 50-72 kWh/day, 989-1514 kWh/day, 49-57 ton/day and 1812-2311 kWh/day, respectively. The system exergy efficiency increases from 17.8% to 40.8% after integrating the ORC unit.
KEYWORDS
PAPER SUBMITTED: 2018-08-04
PAPER REVISED: 2019-02-28
PAPER ACCEPTED: 2019-03-06
PUBLISHED ONLINE: 2019-04-07
DOI REFERENCE: https://doi.org/10.2298/TSCI180804101G
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