Hi everybody
I have the same problem as Cramer (and Fred after him) while trying to
simulate air cooling with type 32.
See below the last statement of Trace before simulation crashes (no water
flow actually).
Has anybody ever solved this issue?
Thanks a lot.
TRACE* UNIT 2 TYPE 32 AT TIME 5.4845000000000000E+03 ITERATION 0
CALL 3175 ITERATIVE CALL
P 7.0000000000000000E+00 4.0000000000000000E+00 1.0000000000000000E+00
2.0000000000000004E-02
I 2.5400000000000002E+01 2.0103539503836029E+01 1.0000000000000000E+03
1.0000000000000000E+01 0.0000000000000000E+00
O 2.5400000000000002E+01 2.0103539503836029E+01 1.0000000000000000E+03
1.0000000000000000E+01 0.0000000000000000E+00
O 0.0000000000000000E+00 0.0000000000000000E+00 0.0000000000000000E+00
*** Fatal Error at time : 5484.500000
Generated by Unit : 2
Generated by Type : 32
Message : Attempted to take the log of a negative number.
- Enthalpy (H) is less than or equal to zero
--
Antoine Gautier
Solamen
+33 6 98 78 56 46
antoine.gautier at solamen.fr
>From silkworth at transsolar.com Thu Feb 11 15:34:15 2010
From: silkworth at transsolar.com (Cramer Silkworth)
Date: Thu, 11 Feb 2010 16:34:15 -0500
Subject: [TRNSYS-users] type 32 (cooling coil) issue
Message-ID: <4B7477D7.5080307 at transsolar.com>
Hi All,
I'm having some problems Type 32, the simple cooling coil. It crashes a
little way into the simulation (at hour 607.75) with an error about an
enthalpy <0. However, it's at a time when the coil has airflow but no
water flow (cooling is not required at this timestep). I see in the code
of type 32 that if either flows are 0 (actually, <1e-6) then it should
simply set outputs = inputs and return. Any ideas what's going on?
Thanks,
Cramer
--
*Cramer Silkworth
212 219 2255 | silkworth at transsolar.com <mailto:silkworth at
transsolar.com>
Transsolar Inc. | 134 Spring Street Suite 601 | New York, NY 10012
-----
>From fbetz at aeieng.com Fri Mar 26 14:43:20 2010
From: fbetz at aeieng.com (Fred Betz)
Date: Fri, 26 Mar 2010 14:43:20 -0500
Subject: [TRNSYS-users] CoolingCoil Type32 error
Message-ID: <CC53390F16CC5446BFDB4B68CF0DAFA40A86D2AD at AEI-MB.aeieng.lan>
TRNSYS Users,
I am getting a strange error: Attempted to take the log of a negative
number. -enthalpy (H) is less than or equal to zero.
This happens right when the simulation starts so only the initial conditions
should be taken into consideration as no information has been passed between
components yet.
The air temperatures (dry and wet bulb) are higher than the water
temperature and as this is a cooling coil, that would make sense.
If someone please shed some light on this error I would appreciate it.
Thanks,
Fred
Fred Betz PhD., LEED AP
Sustainable Systems Analyst
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