Linear Fresnel

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Teresa
how to use data

Hi! Im begining to use SAM. Im confused whit the data to use in CSP, Im using hourly DNI, and for flat plate collectors hourly GHI, DHI and DIF. Is it right?
Thanks

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hys05
Flowsheet for the CSP linear Fresnel Molten Salt model used by SAM with labeling the streams using the hourly data variables

Dear SAM support team

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Paul Gilman
Linear Fresnel Secondary Concentrator

In the model of "Molten Salt Linear Fresnel," I find that the software dose not has the corresponding input parameter about CPC (secondary parabolic mirror). How to consider the influence of the secondary mirror in the simulation calculation?

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Park Jin Gyu
What's the meaning of Field total efficiency?

question 1 : What's the meaning of Field total efficiency and thermal efficiency and optical efficiency?

question 2: I thought that thermal power produced result should be same with (beam normal irradiance)*(Field total efficiency)*(heliostat area) but the result was not same, how thermal power produce can be calculated in SAM?

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JinGyu
LFR steam direct question

I want to know full detail of Thermal efficiency and collector optical efficiency.
and I want to know the absorber efficiency

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Paul Gilman
Case File

Is there an example file for a biopower system?

If you want to see an example of a system in SAM, just create a case with the combination of performance model and financial model for the project you want to investigate. Here are step-by-step instructions to see an example of a biopower system; you can use the same technique to start modeling a photovoltaic, wind, or other type of system:

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williampaulbell
Change in start hour from 1 am to midnight in the change from version 2014.1.14 to 2014.11.24

Dear Paul

Could you answer the following query regarding the change in start hour from 1 am to midnight in the change from version 2014.1.14 and 2014.11.24 please?

I am using all the defaults for the technology "CSP linear Fresnel direct steam" with "No financial model" option.

The TMY3 input file and SAM's output, the Hourly "Electrical Source - Gross Output(MWh)" are attached.

The input TMY3 starts at 1 am but SAM's output starts at midnight.

---1. Should I re-base the TMY3 input files to start at midnight?

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williampaulbell
Gross cycle power output and hour of day mismatch for LFR

Hello Paul

Could you comment on the following mismatch between time of day and gross cycle power output in the attached SAM results file. The input file is also attached. The input is a constant DNI = 767 W/m2. This constant DNI helps isolate the mismatch effect from any possible vagaries of the usual DNI daily cycle.

The table below shows the first day from the results file. The gross output builds up to over 35 MWh before 12 noon then drops to just over 11 MWh at 1 pm.

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williampaulbell
TMY averaging of weather variables within SAM

Hello Paul

Could you clarify the following query about SAM's use of TMY files?

The values for weather variables in TMY files are the average of the previous hour.

However, I notice that SAM takes the values from the TMY file and produces the average of the current hour and previous hour in the hourly data output tables.

Is this in effect doubling up the averaging over the previous hour?

For instance

From SAM
Dry bulb temperature (C) hourly
0
24.5
24.1
23.7

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williampaulbell
Constant weather inputs but non-steady state gross output

Hello Paul

Could you help with the following query please regarding constant weather inputs but non-steady state gross power output?

Table 1 below shows the input for SAM that is kept constant for every hour. Table 2 shows a sample of a daily cycle from SAM's output that is the Gross Power Output.

I assume that SAM recognises the constant inputs and adjusts the DNI to follow an idealised daily cycle based on the time, latitude, longitude and elevation of the site.

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