Re: [EnergyPlus_Support] ** Fatal ** Pond has been frozen for 30 consecutive hours. Program terminates

["Michael J. Witte" <mjwitte@xxxxxxxx>]

It appears that the pond model will not work in a climate where the pond will 
freeze.  I am checking with the model developer to be sure of this or to see if 
there is a workaround.

A couple of other comments regarding this input file.

1.  The HVAC systems do not draw properly in HVAC Diagram.  The first reason 
for this is the way in which the exhaust fans have been described, they are on 
BRANCHes and are connected through ZONE MIXERS.  Zone exhaust fans should be 
directly connected to a zone exhaust and listed in the ZONE EQUIPMENT LIST.  
See ExampleFiles\TermReheatZoneExh.idf for an example.

2.  The zones are served by DIRECT AIR with fixed supply air temperature 
setpoints.  This system cannot adjust the amount of heating/cooling delivered 
to the zone to control the zone temperature.

Mike


On 7 Jan 2005, at 10:02, iaccabr wrote:

> 
> 
> Dear all,
> I want to simualate a little more complex system,
> 1, In Summer, I use a pond as a condenser for a 
> heatpump:watertowater cooling.
> 2, In Winter, use a solar collect system as a heat source for a 
> heatpump:watertowater Heating.
> 3, for the zones, use three ahu to supply direct air.
> 4, I have added some Schedules and system availability managers to 
> contol the plant loop and  condenser loop to act as I wanted. but 
> when i simaulate it for a whole year, I encounter a fatal error like 
> this:
>    ** Warning ** Pond is frozen; Pond model not valid
>    **   ~~~   ** Pond is frozen; Pond model not valid
>    ** Warning ** Pond is frozen; Pond model not valid
>    **   ~~~   ** Pond is frozen; Pond model not valid
>    ** Warning ** Pond is frozen; Pond model not valid
>    **   ~~~   ** Pond is frozen; Pond model not valid
>    ** Warning ** Pond is frozen; Pond model not valid
>    **   ~~~   ** Pond is frozen; Pond model not valid
>    **  Fatal  ** Pond has been frozen for 30 consecutive hours.  
> Program terminates.
> I think I have switched off the cooling plant and condenser loops, 
> although Pond is frozen, hot water plant loop should be available.  
> why does it happend ? I will upload my idf files. 
> Thank you.
> HeTao
> 
> 
> 
> 
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> 
> 
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
> 
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> 
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> in the Files area of the Support Web Site.
> 
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> 



========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx




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