Power Tower

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Luca S
atmospheric attenuation: hourly input with macros?

The aerosol concentration in the air and thereby the atmospheric attenuation between heliostats and receiver varies over the time. It would be great to be able to simulate the annual yield of a power tower plant with hourly or at least daily values for the aerosol concentration. As far as I understand this possibility is not yet implemented in SAM. So before diving really deep into the macro scripting (which I did not use until now) my question is as follows:

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Monteleone91
Can I have in solarpilot the energy produced in a year?

Can I have in solarpilot the energy produced in a year?
Best regards

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Monteleone91
System summary in solarpilot

I want to know in detail what it refers to the value of cost / energy metric present in System summary of Solarpilot model. In the help don't have information.
Best regards.

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Paul Gilman
Power Tower Wind Speed Deflection

We are estimating generation for a molten salt tower, and we have not seen how the wind speed of a given hour is used to model optical losses. There is a section for stow wind speed, but there do not seem to be anything that accounts for:

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joaoguedes
Turbine Output Fraction

I'm accessing SAM 2016 > CSP Power Tower Molten Salt > PPA Single Owner Utility > System Control > Dispatch Control.

SAM allows me to set the 9 periods of the Turbine Output Fraction per weekday and weekend schedule based on hours of day per month.

I would like to follow a similar procedure, but setting different periods per hour per day within a month. For instance, instead of having "Period 1" at "8 am" on all the days of January, to have "Period 1" at "8 am" on the days 2 and 3 of January, while having "Period 2" at "8 am" on 4 and 7 of January.

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Monteleone91
Solar matrix en SOLARPILOT

I would like to know if it's possible to extract the solar matrix from the results of a simulation of the solarpilot programme?

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jesus.polo@ciemat.es
sub-hourly meteo in solar tower model

I'm trying to run sub-hourly simulations (10-minute, 15-minute) for several CSP plant models; I make it only in parabolic trough, but for linear Fresnel and solar tower (direct steam and molten salt) the results are shown only in hourly basis. However, the results in hourly values are different when I used 10 min or 15 min or 60 min data, so I guess it is taking the first 8760 values of the weather sub-hourly file and the calculation is wrong, is this possible?

Thanks a lot for the support and help

Jesus

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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.

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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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