Abstract
In this paper, the characteristics of the supercritical CO2-based Rankine cycle powered by solar energy are experimentally investigated. In order to study the controlling factors of system performances, in the experimental setups an electrical heating section as well as an evacuated solar collect is utilized. Also, corresponding heat transfer measurements of the supercritical CO2 fluid in the heating section are conducted. Results show that the collecting efficiency will increase with the CO2 mass flow rate. The increase in solar radiation and the decrease in condensation temperature in the cycle both can lead to the increase in CO2 mass flow. It is also found that the CO2 fluid flow in the heating section is not fully developed and the Local Nusselt number decreases along the flow direction of the testing pipe. The influences of pressure as well as other controlling factors on heat transfer are also analyzed in detail in this paper. Copyright © 2010 John Wiley & Sons, Ltd.
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