Parasitics in Physical Model

Hello Paul,

I am working with CSP physical model (with no TES) and I have some doubts with the parasitics outputs of the results page, specifically with these two outputs:
- Field pumping power
- Power cycle/TES pumping power
Which is the difference between both values? In SAM, in the Parasitics page it is only possible to define the HTF pumps.

Thanks in advance

The field pumping power is the energy required to operate HTF circulation pumps in the solar field. SAM uses a detailed model based on the physical properties of the field to calculate this parasitic loss. For a description of how SAM calculates the value, see Section 2.5 of the physical trough reference manual.

The power cycle/TES pumping power is the pumping power required by both the power cycle and TES. For your system with no TES, the value represents the energy required by fluid pumps in the power cycle. SAM calculates the pumping requirements of the field, TES, and power cycle separately because the power cycle model does not have sufficient detail to calculate the losses based on physical properties. See Section 5.2.2 in the physical trough reference manual for a detailed explanation.

You can download the physical trough reference manual from the Performance Models page .

Best regards,
Paul.


Thank you for your response.

Now I am in the point that I know the real HTF Pumps consumption (MW), so I can compare this information with the Field Pumping Power obtained as output in SAM. The fact is that both results are different. My question is, can I adjust anywhere (any input data) in SAM in order to obtain my expected HTF Pumps consumption?
As far as I know the only parameter I can change in SAM in Parasitics page is the one that affects to power cycle/TES pumping power, but not HTF pumps. The other option is to use this input in SAM to adjust the HTF pumps consumption but the results of this both output will be mixed.


Thanks again

For the physical trough model, the HTF pump consumption depends on the physical properties of the field. If you make changes to many of the inputs on the Solar Field page, they will affect the energy required to circulate fluid in the field. The HTF pump efficiency input on the Solar Field page is one input that you could use to try to calibrate your results.

Best regards,
Paul.

I am tring to change the HTF pump eficiency but I can't arrive to the consumption I need. Which other value may I change?

Apart from this, I am supposing as Balance of plant parasitics, condensate pumps, feedwater pumps, WTP... Am I correct? As said the physical manual, this parameter is the sum of any loss caused in the energy production.

Thanks in advance
Regards

Hello,

As described in Section 2.5 of the physical trough manual, SAM calculates the solar field HTF pumping losses as a function of the drop in HTF pressure across the field and the HTF mass flow rate. Both of these quantities depend on the properties of the solar field. Unlike some of the other parasitic losses that SAM estimates using the inputs on the Parasitics page, SAM calculates the HTF pumping losses as part of the solar field simulation. Please see Section 2.5 in the reference manual for a detailed description.

Best regards,
Paul.