Minimum DNI for start up MS SPT model

Hi Paul/NREL

When running the annual simulations, I believe I am correct in saying that the model varies HTF flow rate to achieve the desired outlet temperature based on the DNI and resultant incident flux on the receiver.

However, how does the model specify a minimum DNI for production of hot salt? if so, what is this value and can I change this?

Kind regards

Harry

Hi Paul, 

Thanks for getting back to me. Sorry about that, what I meant was, how does the performance model "decide" when to start/stop the heating of HTF. I had assumed it was based on a minimum instantaneous DNI, but I had a more thorough look through, and I believe it is done by specifying a minimum flow rate, is that correct?

IF so I am assuming the model calculates the flowrate of HTF required to yield the outlet temperature, and if the DNI and hence flux on the receiver are so low that the flowrate would be below the specified lower bound, then the process is non operational for that hour?

IS that at all correct Paul? if not, please could you correct me?

Thank you,

Harry