the parabolic trough simulation result

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CSP123
the parabolic trough simulation result

Dear Paul Gilman,

I try to simulate a plant with the parabolic trough physical.
When I set the "collector azimuth angle" as 90°,and I find the thermal energy to the power block will be more than the thermal energy produced by the field in the data tables of result. I am confused about the result, so I guess something will be ignored by me. The attachment is my sam file.

I would appreciate it a lot if you would give me a reply.

Thanks and Best regards.

lisen huo

Paul Gilman

Dear Lisen Huo,

I do not see those results. When I run a simulation, I see that "field thermal power produced" is always more than "cycle thermal power input" except for times at night when thermal storage provides energy to the power block.

Best regards,
Paul.

CSP123

Dear Paul Gilman,

Thanks very much for your replying.

Do you simulation with the meteorological data of CHN_Nei.Mongol.Hailisu.532310_CSWD.epw attached in above email? And could you send your

simulating result file to me?

The following is my simulating result data and you can see the "the thermal energy to power block" is more than "the thermal energy

field produced "

Thermal power produced by the field(MWht) Thermal energy to power block (MWht)
Jan 41425.6 42912.4
Feb 44967.8 46051.4
Mar 50501.1 51263.1
Apr 48278.6 48225.7
May 62725.8 62739.7
Jun 65607.1 66191.9
Jul 63193.9 64831.7
Aug 45868.3 46431
Sep 45749.8 47335.7
Oct 45659.7 47151.4
Nov 35010.4 36153.8
Dec 37031.7 38343.7
Total 586019.8 597631.5

Best regards

lisen huo

Paul Gilman

Dear Lisen Huo,

In my comment above, I was looking at hourly results. You are looking at monthly totals.

For a system with storage, consider this data for a single day. You can see how the daily sum of power values to power block is greater than the sum of power values produced by the field:

 

Time stamp Field thermal power produced (MWt) Cycle thermal power input (MWt) TES thermal energy into storage (MWt)
1/2/2018 0:00 0 0 0
1/2/2018 1:00 0 0 0
1/2/2018 2:00 0 0 0
1/2/2018 3:00 0 0 0
1/2/2018 4:00 0 0 0
1/2/2018 5:00 0 0 0
1/2/2018 6:00 0 0 0
1/2/2018 7:00 0 0 0
1/2/2018 8:00 0 0 0
1/2/2018 9:00 0 0 0
1/2/2018 10:00 0 0 0
1/2/2018 11:00 0 0 0
1/2/2018 12:00 0 0 0
1/2/2018 13:00 155.148 125.691 35.0561
1/2/2018 14:00 0 38.0186 -38.0723
1/2/2018 15:00 129.559 125.691 4.65497
1/2/2018 16:00 0 0 0
1/2/2018 17:00 0 0 0
1/2/2018 18:00 0 0 0
1/2/2018 19:00 0 0 0
1/2/2018 20:00 0 0 0
1/2/2018 21:00 0 0 0
1/2/2018 22:00 0 0 0
1/2/2018 23:00 0 0 0
Total 284.707 289.4006 1.63877

Best regards
Paul.

CSP123

Dear Paul Gilman,

I am really appreciated for your information.

And I am confused what leads to the result that the power values to power block is greater than the sum of power values produced by the field in daily sum, month sum or year sum data. Could you explain it to me?
why is the energy produced by field less than Cycle thermal power input (MWt)plus TES thermal energy into storage (MWt) at a time point in hourly data you commented?

I try to find the loss energy by changing the row spacing, but i only find the shadowing loss efficiency instead of energy in the result.Could you tell me how to calculate shadowing loss energy by using hourly data in the result?

Best regards

Lisen huo

Paul Gilman

Dear Lisen Huo,

The reason that the sum of hourly power to power block is greater than the sum of power produced by field over some period of time is because of the nighttime hours when energy from storage goes to the power block. You can see that in the table above.

You can estimate the shadowing loss by multiplying the "Field collector row shadowing loss" by "Field thermal power produced."

Best regards,
Paul.

CSP123

Dear Paul Gilman,

Thanks and hope you have a nice day.

I think the energy from storage that will go to the power block at nighttime hours also comes from the energy produced by field, am I wrong and why?

if i am right, the sum energy to power block should be less than the sum energy produced by field because of heat loss.

Best regards

Lisen

Paul Gilman

Dear Lisen,

You are correct that all of the energy comes from the solar field, and that the energy delivered to the power block is less than the energy from the filed because of thermal losses.

Because the hourly "Cycle thermal input" includes both heat from the field and storage, the sum of the hourly values is greater than the sum of hourly "Field thermal power output." But, as you can see from the table, if you consider the hourly "TES thermal energy into storage," you can see why that is.

Best regards,
Paul.

CSP123

Dear Paul Gilman,

Thanks for your quick reply.

We can see solar plant is charging into the storage and meanwhile generating electricity at the time of 1/2/2018 13:00 in the table you attached. But I am confused that "Field thermal power produced (MWt)" is less than "Cycle thermal power input (MWt)" plus "TES thermal energy into storage (MWt)",155.148<125.691+35.0561, at this time, could you explain this?

Best regards,

Lisen

Paul Gilman

Dear Lisen,

In that time step, the power cycle starts operating. Because of the "Power block startup time" and "Fraction of thermal power needed for startup" inputs on the Power Cycle page, the power cycle does not operate at its full capacity because it needs time to warm up. The power cycle operates at 50% capacity during this startup hour, and the excess power available from the solar field goes into storage.

Best regards,
Paul.

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