A schematic of the system.
Picture: Southeast College
Researchers at Southeast College in China are investigating the potential for coupling compressed carbon dioxide (CO2) to a mixed heating and energy (CHP) unit for photo voltaic and renewable vitality storage.
The proposed resolution is a closed-cycle system with a 600 MW CHP unit and a carbon dioxide vitality storage facility (CCES). It makes use of the warmth from the backwater of the new community and operates via two levels of compression and enlargement utilizing water and carbon dioxide as working fluids, with out exchanging mass with the skin surroundings.
“In the course of the off-peak, the s-CO2 launched from the low-pressure tank (LPT) is compressed by the compressor pushed by the surplus capability of the CHP era,” the scientists defined.
The compressed CO2 then passes via the intercooler to retailer the compression warmth within the water that exits the cold-water tank (CWT).
“After two rounds of compression, the s-CO2 is saved within the excessive strain tank (HPT), and the cooling water is pumped to be saved within the sizzling water tank (HWT),” mentioned the scientists. “The cooling water within the improved system absorbs extra warmth from the center extraction steam earlier than getting into the HWT.”
Throughout peak durations, the HPT releases sCO2, which is handed via a reheater to get better warmth from the HWT. It drives the turbine to generate electrical energy. After this, the sCO2 is saved within the LPT, which passes via the warmth exchanger, whereas the water returns to the CWT.
The Chinese language group used thermodynamic fashions to carry out a thermodynamic and parametric evaluation of the system and located {that a} system configuration that adopts an uneven compression and enlargement ratio distribution presents the perfect system efficiency. The researchers say that the optimum system configuration achieved a complete exergy effectivity (TEE) of 35.96% and an vitality storage density (ESD) of 1.54 kWh/m.3.
The scientists introduced the system in “Thermodynamic evaluation and optimization of a compressed carbon dioxide vitality storage system mixed with a mixed heating and energy unit,” which was just lately printed in Vitality Conversion and Administration.
“The efficiency and thermoelectric coupling traits of the proposed built-in system below variable working circumstances needs to be analyzed sooner or later to evaluate its capacity to eat renewable vitality,” they mentioned.
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