Re: [TRNSYS-users] [re-send]Type 536(Linear Parabolic Trough) output temperature

Dear 김지혁[기계공학부,

From a quick look at type 536 it is clear that you need to suitable dimension your solar field. At the moment you are using only 2m^2 of collector area which is very little considering the energy requirements of your system.

As for your questions:

1 – The outlet temperature is smaller due to the thermal losses at the solar field. You can see the thermal losses effect by changing the thermal losses coefficients and observing their impact in the outlet temperature. Your values seem large, particularly the a2 coefficient value. You should use values closer to real collector parameters (a nice database is available at http://www.stage-ste.eu/keydocuments/solarthermalcollectors.php).

2 – The plot seems constant due to the small total aperture area. You are supplying very little energy to your heat transfer fluid, thus you don’t observe significant temperature changes. Just try to increase the aperture area and you will see variation. This is a signal that your solar field is not suitably designed and that you must perform a proper dimensioning of the field.

I hope this helps. Best regards,

João Pereira Cardoso

Unidade de Energias Renováveis e

Integração de Sistemas de Energia

From: 김지혁[기계공학부] [mailto:wlgur0220@kookmin.ac.kr]
Sent: terça-feira, 14 de agosto de 2018 08:02
To: trnsys-users-request@lists.onebuilding.org; trnsys-users@lists.onebuilding.org; TechSupport@tess-inc.com
Subject: [TRNSYS-users] [re-send]Type 536(Linear Parabolic Trough) output temperature

I have designed a PTC power plant.

I sued LPC(Linear Parabolic Collector), type 536, in order to get heat before its working fluid passes through the steam boiler.

However, when I simulate this cycle, I have 2 problems about Type 536.

1. Inlet temperature of Type 536(or outlet temperature of Condensate pump-2) is higher than outlet temperature of Type 536

: The reason why I have used Type 536 is to get some heat from solar thermal energy.

But its temperature decreases by passing through Type 536. I wish to know a reason of this result.

2. Outlet temperature of Type 536 is constant, not variable by time, even though I use a data file.

: I expected variable plot of Type 536's outlet temperature when I designed this cycle cause I cited a data file.

Could I know reasons for this 2 results...?

I want to get a logical result with my TRNSYS trial.

Thanks

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