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.

I also assume that SAM recognises non-constant input of DNI and does not adjust the DNI for some idealised daily cycle.

Could you advise if my assumptions are correct?

Regards

William Bell


Table 1: SAM input - constant weather variables
DNI (W/m2): 767
Dry temperature (°C): 26.1
Relative humidity (%): 55
Pressure (hPa): 989.5


Table 2: SAM output - daily cycle but expecting steady state
Gross cycle power output (MWh), hourly
0
0
0
0
0
0
0
1.90196
23.0868
32.7346
35.2751
35.2808
11.3107
8.00759
7.24606
6.26285
0
0
0
0
0
0
0

Hello Paul

Thank you for you reply.

I have up loaded the input and output files for SAM to the original support request.

Regards

William

Hello

Thank you for the clarification regarding the artificial data that I was using for a sensitivity analysis.

So, SAM shapes the DNI data according to the the hour of year, latitude, longitude, and time zone. This works well for constant input to shape the data into something more realistic.

However, we have DNI data based on readings from the site of the proposed LFR. These DNI readings are a fair indication of the DNI incident on the proposed plant and don't require modification. Could you let me know if SAM would also shape our DNI readings measured taken at the proposed site?

Regards

William Bell