Power Tower

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Mwende
Power tower molten salt

Hello,

A few questions on the power tower;

1. What exactly is the heliostat field multiple?
2.According to SAM help, the fossil dispatch mode/setting of fossil fill fraction should be in the power cycle page but can't seem to find any such option
3.Is the receiver set to external by default,looks like there aren't input parameters for cavity type
4.Is there any reference or indicative value of fossil back up cost ($/kWe) assuming you're using natural gas?
5.For the tower fixed cost,any indication on how this would vary with height?

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JDevins
Using Parabolic trough Field collector DNI for Tower (Salt)

Hello just reading through the help and previously asked questions on this forum and all answers in regards to the design point DNI lead to using the parabolic trough "field collector DNI - Cosine product". If I wanted to get this value for a tower system would I put the parameters into the trough system and then use that value or use the "Resource beam normal irradiance given in the tower time series tab? Thanks in advance for the help.

1 post / 0 new
Paul Gilman
Sun shape

Could you please tell me what kind of sun shape does the program use for the image distribution of heliostats in the receiver on top of the tower? I can’t see any reference in the model.

SAM's SolarPILOT optimization algorithm uses the "limb darkened" sun shape from the DELSOL3 model, as described in Wagner 2008 and Kistler 1986, which are both referenced under "Power Tower" on the Performance Model Documentation page of this website:

https://sam.nrel.gov/performance

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eruvaram
TES ENERGY STORAGE

Hello,
I would like to how to do analysis for Gemasolar power plant with thermal energy storage a without thermal energy storage ,i am planning o study what is the difference between the costs when i just change the tes capacity the cos of electricity is low with tes than without tes.

Thanking you,
Vamsi

1 post / 0 new
Paul Gilman
Reference Weather Conditions for CSP Systems

We are stuck because of the terms of design DNI which changes according to location. What is the difference between available DNI (kwh/m2.year) and design DNI (W/m2 )? Both of them are meteorological data. How can I interpret relationship available DNI between design DNI?

SAM uses the solar radiation data in the weather file that you choose on the Location and Resource page to calculate the solar irradiance incident on the solar field during simulations.

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salraqqad
SAM Solar Tower with Molten Salt Storage Defaults

Are the Default values in the newest version of SAM for the Power tower with storage based on a real powerplant?

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xpeng37@wisc.edu
Solar Field Land Area Multiplier set up

Dear Paul,

When I am trying to vary the solar multiple of a molten salt power tower to see its influence on the collector and receiver efficiency, I encountered two problems,

1) In the heliostat field setup, I try to vary different "Solar Field Land Area Multiplier" and then optimize the solar field, but the calculated "total land area" doesn't change. Souldn't the area become bigger with larger area multiplier?

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salraqqad
Power Tower with Molten Salt Storage controlled output

Hello,

1 post / 0 new
Paul Gilman
Tower optical efficiency for molten salt and direct steam

Is there a specific reason why the Field optical efficiency of a molten salt CSP power plant differs extremely from the efficiency of a Direct Steam Tower plant, including drops to zero in the middle of a day?

The molten salt tower model sets the field optical efficiency to zero when the tower is not delivering energy. SAM effectively turns off the tower when the DNI is below a certain minimum value. The direct steam model, on the other hand, reports the calculated optical efficiency, regardless of what the tower is doing.

Best regards,
Paul.

1 post / 0 new
meravgilad
The attached file stop running during simulation

Hello,

Could you please help me understand why the attached file stop running during simulation (at the process stage)?

Best Regards,

Ms. Merav Gilad
Project & Process Engineer

E-Mail: mgilad@BrightSourceEnergy.com
Phone: +972 (0)77-202-5004

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