Dear SAM support team
Dear SAM support team
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?
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?
I want to know full detail of Thermal efficiency and collector optical efficiency.
and I want to know the absorber efficiency
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:
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?
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.
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?
Dry bulb temperature (C) hourly
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.
In parabolic trough system modelling SAM allows you to see the number of loops, size of each assembly and assemblies per loop. This allows you to get an idea of how the plant can be laid out on a given piece of land. Is this possible with the linear Fresnel modelling as well? I don't seem to see how to do it.