Re: negative solar radiation

[Jeroen Van der Veken <Jeroen.VanderVeken@xxxxxxxxxxxxxxxxxx>]

the component order :
13 equations, mainly used to control the radiators and the heater
3 type 9's
type 33e
type 16h
type 69
type 56
type 41 (schedule)
5 type 14 (day/night schedules)
5 on/off controllers (for shading system)
40 tubes, diverters and tee pieces
type 3d (pump)
type 6 (ideal heater)
9 times a radiator system with type 137 (PID-controller), tubes, 
diverter, tee piece, type 177 (mix of 180 and 80),
type 65
2 type 93 (value recall of zone temperatures, to send to the ambient 
temperature input of the PID-controllers, radiators and tubes and use 
for ventilation air temperature in toilet and bath room.)
type 25c
probably this is not really helping you much, I will sent you the TPF 
and relating files.

I tried to create a macro of the whole system and copy/paste that to an 
empty project, but then my computer crashed, and my file was lost 
forever. When Isibat refuses to save it is also quite unstable.
Even saving every five minutes on the hard disk and on a memory stick 
doesn't help much, as the file on the memory stick can be opened but 
can't be saved either.
What do you mean with replicate the error ? I can't save it when it 
happens, since that is the problem...
I will download the updated version of the Isibat, maybe that will help...


Jeff Thornton wrote:

> 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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