Hi, Waytt
Have you solved your problem?
If not, write down all the temperatures on your system diagram, and see if they make sense.
As your panel is not insulated on the upper surface, its temperature may rise to that of the roof when the sun is shining.
With VAV damper in the zone, the thermostat is used to control the VAV damper and reheat heater.
Under what condition that the thermostat will control the panel?
Why do you need two chillers? If the second chiller does not come on, the panel has no cooling supply.
Variable flow system is more difficult to impliment, as a separate controller and sensor may be required. You may not have these specified.
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: wyatt.kennedy21@xxxxxxxxx
Date: Tue, 17 Jan 2012 21:11:29 +0000
Subject: [EnergyPlus_Support] Re: Variable flow chilled ceiling input water temperature too high
__._,_.___
Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx
The primary EnergyPlus web site is found at:
http://www.energyplus.gov
The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/
Attachments are currently allowed but be mindful that not everyone has a high speed connection. Limit attachments to small files.
EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
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Have you solved your problem?
If not, write down all the temperatures on your system diagram, and see if they make sense.
As your panel is not insulated on the upper surface, its temperature may rise to that of the roof when the sun is shining.
With VAV damper in the zone, the thermostat is used to control the VAV damper and reheat heater.
Under what condition that the thermostat will control the panel?
Why do you need two chillers? If the second chiller does not come on, the panel has no cooling supply.
Variable flow system is more difficult to impliment, as a separate controller and sensor may be required. You may not have these specified.
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: wyatt.kennedy21@xxxxxxxxx
Date: Tue, 17 Jan 2012 21:11:29 +0000
Subject: [EnergyPlus_Support] Re: Variable flow chilled ceiling input water temperature too high
I have included the idf file in my uploaded files folder: http://tech.groups.yahoo.com/group/EnergyPlus_Support/files/Variable%20Flow%20Chilled%20Ceiling%20/
Keep in mind that the results from this idf will look different than the results shown from the previous posting, because this idf file is just for a test zone (although, it is the same HVAC system, construction, internal loads, etc.)
I am using the San Jose, CA TMY3 weather file.
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Linda Lawrie <linda@...> wrote:
>
> If you want a definitive answer, you may want to send your idf file
> to the helpdesk along with indicating what weather file you are using.
>
> You should narrow down the reporting of the problem so that we can
> better be able to answer. (on the helpdesk).
>
> Some guidelines are posted in the troubleshooter area for "getting help".
>
> At 06:22 PM 1/10/2012, wyatt.kennedy21 wrote:
>
>
> >I have created a variable flow chilled ceiling system for an office
> >building. I used Design Builder to build the initial model. I have a
> >setpoint manager on the chilled water supply that should control the
> >temperature to 15 C. I am having a problem where the input
> >temperature for the chilled ceiling is too high. Please refer to my
> >uploaded screenshots:
> ><http://tech.groups.yahoo.com/group/EnergyPlus_Support/files/Variable%20Flow%20Chilled%20Ceiling%20/>http://tech.groups.yahoo.com/group/EnergyPlus_Support/files/Variable%20Flow%20Chilled%20Ceiling%20/
> >. I have made sure to check that my internal loads are correct are
> >too high. The "chilled water" input temperature into the chilled
> >ceiling gets as high as 35 C. I have a few ideas as to what the
> >problem may be involving:
> > * If you have a variable flow chilled ceiling, does the attached
> > chilled water loop have to be a variable flow loop or is there a
> > way to have constant flow loop with bypass?
> > * The chiller output temperature is matching the the input
> > temperature to the chilled ceiling so it may have something to do
> > with the chiller
> >
> >I didnt have this problem when the chilled ceiling was constant flow
> >(the input temperature was always 15 C and so was the output temp of
> >the chiller), so it has something to do with changing the chilled
> >ceiling to variable flow. Any comments or suggestions would be
> >greatly appreciated!
> >
> >
> >
> >Thank you,
> >
> >Wyatt
> >
> >
> >
>
Keep in mind that the results from this idf will look different than the results shown from the previous posting, because this idf file is just for a test zone (although, it is the same HVAC system, construction, internal loads, etc.)
I am using the San Jose, CA TMY3 weather file.
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Linda Lawrie <linda@...> wrote:
>
> If you want a definitive answer, you may want to send your idf file
> to the helpdesk along with indicating what weather file you are using.
>
> You should narrow down the reporting of the problem so that we can
> better be able to answer. (on the helpdesk).
>
> Some guidelines are posted in the troubleshooter area for "getting help".
>
> At 06:22 PM 1/10/2012, wyatt.kennedy21 wrote:
>
>
> >I have created a variable flow chilled ceiling system for an office
> >building. I used Design Builder to build the initial model. I have a
> >setpoint manager on the chilled water supply that should control the
> >temperature to 15 C. I am having a problem where the input
> >temperature for the chilled ceiling is too high. Please refer to my
> >uploaded screenshots:
> ><http://tech.groups.yahoo.com/group/EnergyPlus_Support/files/Variable%20Flow%20Chilled%20Ceiling%20/>http://tech.groups.yahoo.com/group/EnergyPlus_Support/files/Variable%20Flow%20Chilled%20Ceiling%20/
> >. I have made sure to check that my internal loads are correct are
> >too high. The "chilled water" input temperature into the chilled
> >ceiling gets as high as 35 C. I have a few ideas as to what the
> >problem may be involving:
> > * If you have a variable flow chilled ceiling, does the attached
> > chilled water loop have to be a variable flow loop or is there a
> > way to have constant flow loop with bypass?
> > * The chiller output temperature is matching the the input
> > temperature to the chilled ceiling so it may have something to do
> > with the chiller
> >
> >I didnt have this problem when the chilled ceiling was constant flow
> >(the input temperature was always 15 C and so was the output temp of
> >the chiller), so it has something to do with changing the chilled
> >ceiling to variable flow. Any comments or suggestions would be
> >greatly appreciated!
> >
> >
> >
> >Thank you,
> >
> >Wyatt
> >
> >
> >
>
__._,_.___
Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx
The primary EnergyPlus web site is found at:
http://www.energyplus.gov
The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/
Attachments are currently allowed but be mindful that not everyone has a high speed connection. Limit attachments to small files.
EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
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