The exchanger is a heat exchanger between the HTF and the CO2. It is a counterflow HX, based on a TLMD. The conductance UA has to be specified from the on-design.
The conductance in off-design varies as UA_Off=UA_on * (m_flow/m_design)^0.8. The average between the two mass flows is taken.
A.T. Louis et T. Neises, analysis and optimization for Off-design performance of the recompression s-CO2 cycles for high temperature CSP applications, in The 5th International Symposium-Supercritical CO2 Power Cycles, 2016
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