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Re: negative solar radiation

At 02:50 PM 6/15/2004 +0200, you wrote:

That is no problem anymore if I lower the timestep to 0.1 hour and less, and/or reduce the power of the radiation. However, with smaller timesteps I get the error
***** ERROR ***** UNIT 20 TYP # 56
NEGATIVE VALUE OF SOLAR RADIATION FOR 5. ORIENTATION ENCOUNTERED. SIMULATION STOPPED.
If I follow the radiation from the radiation processor, this doesn't seem the case. It seems that the problem is in Type56.

This can happen sometimes if the component order in IISiBat isn't ideal. We've noticed it a few times when we have Type 16 followed by Type 56 followed by a Type 34 shading device. Type 56 gets the incidence angle from Type 16 and an older value of radiation from Type 34 at the first iteration and errors out. Check for situations like this.

And to make it really frustrating, TRNSYS doesn't appear to like my TPF-files and announces from time to time when I want to save the project "save failed". Trying to save it on another disk or diskette doesn't work and when I reboot my computer, the whole file seems to have dissapeared from the hard disk. Not only the latest changes, the whole thing.

If that happens, copy everything in the project and paste it to a new project - then save the new project. Can you replicate the error so we can forward it on to the IISiBat developers?

Jeff


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Thermal Energy System Specialists (TESS)
Jeff Thornton                                   2916 Marketplace Drive
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