THERMAL SCIENCE

International Scientific Journal

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Wanjin Bai

,

Xiaoxiao Xu

COMPARATIVE ANALYSES OF TWO IMPROVED CO2 COMBINATED COOLING, HEATING, AND POWER SYSTEMS DRIVEN BY SOLAR ENERGY

ABSTRACT
To make use of solar energy fully and efficiently, the two improved combined cooling, heating, and power systems (CCHP) are proposed by adding a gas heater and an extraction turbine, based on the transcritical CO2 ejector refrigeration system. A relatively high-pressure fluid is extracted by the extraction turbine as a primary stream of ejector to improve the ejector performance. In the meantime, the gas heater absorbs low-temperature exhaust heat to increase the extraction turbine’s output work. Comparative studies on the thermal efficiency and exergy efficiency of the two improved systems show they are more efficient alternatives for the transcritical CO2 ejector refrigeration system. The CCHP-B system has relatively broad working condition, higher thermal efficiency and exergy efficiency than that of CCHP-A system.
KEYWORDS
CCHP, CO2, supercritical, exergy efficiency, thermal efficiency
PAPER SUBMITTED: 2017-10-08
PAPER REVISED: 2017-12-08
PAPER ACCEPTED: 2017-12-10
PUBLISHED ONLINE: 2018-02-18
DOI REFERENCE: https://doi.org/10.2298/TSCI171008054B
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2018, VOLUME 22, ISSUE Supplement 2, PAGES [S693 - S700]
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Comparative analyses of two improved CO2 combinated cooling, heating, and power systems driven by solar energy

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence