Abstract
The wide utilization of solar energy is beneficial for the emission reduction of carbon dioxide. This paper proposes a novel power cycle system driven by solar energy, which consists of a recompression supercritical carbon dioxide cycle (RSCO2) and an ammonia-water cooling-power cycle (ACPC). The power system operates in a “self-production and self-sale” mode, which means that the refrigeration capacity produced by the ACPC is utilized to cool the main compressor inlet fluid of the RSCO2. The comprehensive energy and exergy analyses of the proposed novel system are presented. The effects of the six parameters on the system thermodynamic performance are evaluated, which are direct normal irradiation, the ammonia concentration of a basic solution, the pinch point temperature difference of an evaporator, the effectiveness of a recuperator, the pressure ratio of the RSCO2 and the molten salt outlet temperature. The results show that compared with the stand-alone RSCO2, the net power and energy efficiency of the proposed system are improved by 15.94 and 10.61%, respectively. In addition, the increasing ammonia concentration of the basic solution leads to the rise of the ACPC refrigeration output, and the inlet temperature of the main compressor can be declined to 32.97°C with the ammonia concentration of the basic solution of 0.88. Moreover, when the effectiveness of the recuperator in RSCO2 rises up to 0.98, the system energy and exergy efficiencies can reach their maximum value of 30.68 and 33.10%, respectively.
Highlights
The utilization of renewable energy can effectively reduce carbon dioxide emission, which contributes to the sustainable development of green energy society
The system consists of a Tower solar power system (TSP), an RSCO2, and an ammoniawater cooling-power cycle (ACPC)
At the high-temperature recuperator (HTR) outlet, CO2 splits into two flows: one flow is compressed by the recompressor and mixed with heated CO2 from an low-temperature recuperator (LTR); another flow passes through the heat exchanger for the improving temperature of the ammonia-water basic solution in ACPC, and it is cooled successively in the precooler and evaporator
Summary
The utilization of renewable energy can effectively reduce carbon dioxide emission, which contributes to the sustainable development of green energy society. Javadi et al (2021a) evaluated the energy, exergy, and economic and environmental performance of a combined power cycle with TSP They proposed three different configurations, and configuration b) which use solar power to heat air at compressor outlet realize highest energy and exergy efficiency of 51.38 and 41.75%, respectively. The effects of the six parameters on the system’s thermodynamic performance are studied, including direct normal irradiation, DNI, the ammonia concentration of a basic solution, x, the pinch point temperature difference of an evaporator, ΔTe, the effectiveness of a recuperator εR, the pressure ratio of RSCO2, PR, and molten salt outlet temperature Tb. In this paper, Section 1 is the introduction.
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