.SolarTherm.Models.CSP.CRS.Receivers.SodiumReceiver_modular

Information

Brief description:

This model simulate an external receiver that is composed by a series of flat panels with the a vertical arragement of tubes. This panels are arranged around the circunference of the solar tower. The coating absortance and emittance of the tubes determine the receiver thermal losses. It assumes a single receiver temperature which is calculated acording the average temperature between the inlet and outlet fluid temperature. In this model a mass flow rate is heated as a function of the concentrated solar power considering thermal losses but neglecting effects due to receiver shape and thermal capacitances. The outlet specific enthaply is calculated in an algebraic way assuming that:

heat flow rate absorbed = heat flow rate emitted + mass flow rate * (outlet specific enthalpy - inlet specific enthalpy)

This model allows zero mass flow rate althought the model only guarantees the results at the operating range.

Inputs:

HeatPort:

• heat: This connector provides the total concentrated solar power that reachs the receiver and gives the temperature of the receiver.

FluidPort:

• fluid_a: This connector provides the inlet mass flow rate and specific enthalpy of the system working fluid, the pressure is not used.

Parameters:

Working fluid:

• Medium: This parameter defines the medium in the component. The thermodynamic properties of the fluid are function of this medium model. All Modelica.Media can be selected and new ones that extend from the Partial Medium

Technical data:

• H_rcv: Height of the receiver panels.
• D_rcv: Total diameter of the receiver. The double distance between the center of the tower to a center of a receiver panel.
• N_pa: Total number of panels.
• D_tb: The outer diameter of the panel tubes.
• t_tb: The thickness of panel tubes.
• ab: The absorptance of the receiver coating.
• em: The emissivity of the receiver coating.

Outputs:

FluidPort:

• fluid_b: This connector provides the outlet mass flow rate and specific enthalpy of the system working fluid, the pressure is not used.