air cooled condenser

for ACC system , and applying equation no. 3.26 on page 72, if we increase ITD temperature, so we can reduce air flow rate and hence we can reduce parasitic load of fan power THEN increase power net output but where ITD temp. is difference between steam and ambient temperature and by increasing ITD,Condenser temperature increases where condenser temperature =dry bulb temperature + ITD so thermodynamic efficieny decreases and power decreases. so please advice for this contrast.

also what is larger, parasitic load of air cooling fan or water cooling fan?

Dear Saeed,

I assume you are asking about power cycle cooling for the physical trough model. SAM reports the cooling parastic power as "Parasitic power condenser operation." You can use that variable to compare parasitic losses for different kinds of cooling.

Please avoid using abbreviations, and tell me what model you are using to help me answer your questions correctly.

Best regards,
Paul.

Thanks Paul,

I used hpysical model trough of solar field of 510120 m2 with hitec solar salt of storage 7.5 hrs to produce net electric power 200 Mwe , input solar radiation at design is 910, 1017, 690 m2 with once air cooling condenser and the other one is water cooled.

is these inputs are valid?
also net electric power is very little than 200 Mwe?
is these input suitable for 50 Mwe?
what are differences between parasitic load between water cooling and air cooling models?
why total parasitic load of air cooled is higher than of water cooled?
for example: for 50 Mwe plant
total parasitic load of air cooled is 2.51 Mw at June
total parasitic load of water cooled is 1.5 Mw at June

i ask about of

For a detailed discussion wet and dry cooling and how SAM models it, please see Section 3.3 "Heat Rejection" in the physical trough reference manual ( PDF 3.7 MB ).
Best regards,

Paul.

Dear Paul

I hope you are keeping well.

I would like to know whether you could please refer me to the code on github that details the parasitic power consumption (fan power) calculations for the dry-cooling case?

I have had a look, but it seems I'm missing something. 

Best regards
Louw

Hi Louw,

You can find fan power calculations in the HybridHR() function definition that starts here:

github.com/NREL/ssc/blob/34cb9ca6569e5f54113302210195ca064711df0e/shared/lib_powerblock.cpp#L1500

Best regards,
Paul.