Johannes,
You actually might be in luck with the provided TESS sample catalog data for your micro CHP system. There is a popular micro CHP system that is manufactured here
in Wisconsin, the “Marathon Engine” or the Ecopower, and it produces 5.5 kW electric and 12.5 kW thermal (from the 4 HXs that you mentioned) that runs on natural gas or propane. It used to be manufactured in Germany or Austria, so perhaps it is the same or
very similar system? I was on a project team that helped implement the system in an energy systems laboratory at MSOE, and there was another TRNSYS user that implemented a system at the University of Maryland. Nonetheless, there is an external data file for
a similar an IC engine system that is provided with the TESS Libraries:
C:\Trnsys17.02.0003\Tess Models\SampleCatalogData\IC Engine\ECOPOWER9-18.dat
As you can see from the comments and the values in the data file, the majority of the thermal energy from this goes into the jacket and the exhaust. It does not
have waste heat from the generator in this particular data file.
However, I cannot stress enough what Jeff mentioned: take your time, take a step back, make sure this data file (with PLRs and fractional waste heat values) aligns
to your particular system, get this piece working first, and then proceed with the rest of your simulation once you have that piece set. There is also a very simple example with this data file in Type907 with a simple exhaust heat exchanger for reference:
C:\Trnsys17.02.0003\Tess Models\Examples\Cogeneration (CHP) Library\IC_Engine.tpf
Cheers,
Matt
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Matt Duffy
Sustainable
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AEI | AFFILIATED
ENGINEERS, INC.
5802 Research Park Boulevard | Madison, WI 53719
P: 608.236.1207 | F: 608.238.2614
mduffy@aeieng.com |
www.aeieng.com
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From: TRNSYS-users [mailto:trnsys-users-bounces@lists.onebuilding.org]
On Behalf Of Jeff Thornton
Sent: Wednesday, May 20, 2015 5:37 PM
To: trnsys-users@lists.onebuilding.org
Subject: Re: [TRNSYS-users] TYPE907
Johannes,
I took a look at your project and I think you should take a step back and work on things a bit at a time. I've attached a simple project showing how a 70 C cooling stream is connected to an IC Engine with a varying load. Take the time to completely understand
how this project works before connecting up the tank, condenser, tank cooling stream etc. Remember that the odds of the default engine performance files being identical to your particular machine are small - you may have to modify the parameters and external
files to match your given simulation. Your question as to "Next, I have thermal load profiles in kWh. I don't know how I can integrate the load to unload the storage." How do they do it in real life? There's your answer. I'm guessing they have a pumped
flow through the tank that uses the thermal energy. Try the flowstream loads component, controllers, pipes, pumps etc to mimic the real world system.
Jeff
On 05/20/2015 8:51 am, Johannes Kirch wrote:
thank you for your fast answer. In my mail before, I said that I want to load the thermal storage tank with the heat out of the exchangers. I tried to simulate a real CHP unit
with 5.5 kW elec and 12.5 kW thermic. The CHP unit works just in full load, that means "on" or "off". There are four HX in the CHP to gain the heat out of generator, oil cooler, water jacket and exhaust. At the outlet of the CHP should be 83 °C to load the
storage with that temperature and back to the CHP after the condenser with 70 °C (max.). There is a fluid flowrate to cool the components with 823 kg/hr. But I don't get the desired 83 °C. There must be a mistake between oil cooler and water jacket as you
can see in the plot. A pdf with the function principle is in the Annex.
Next, I have thermal load profiles in kWh. I don't know how I can integrate the load to unload the storage. As you can see in the project there is no "feedback" through the
CHP with 70°C, because the "load side" is incomplete. The load side is should be a HX to dump the arriving heat. So there is no unloading of the storage.
The project and thermal load (.txt) are in the Annex.
I don't have the proforma in from of me but do you have flow through all the required inlets (cooling water, etc) and any on/off control signals set on? If you're convinced
you do, it would help to send the project along.
I am trying to build a energy hybrid system for my dissertation in TRNSYS. There are a photovoltaics system and a cogeneration system linked with a battery storage. The photovoltaics
system is working. For the CHP I am using TYPE 907 and some heat exchangers and thermal storage tank for the heating part. But the IC Engine is not working. I tried some real electrical load profiles and linked them in TYPE 9c with the engine as "desired output
power". But there is still no power to see in the output and no increase of the temperatures of the coolants. So how can I get this engine working?
I am not sure where are my mistakes. Is there an example availible to get a better comprehension of TYPE 907 in combination as CHP?
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