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Re: [EnergyPlus_Support] No Chilled or Hot water flow through coils.
More information from the developer. This should help get you going. MJW
There is a program problem. It's coming from the System Sizing input.
Look at:
SYSTEM SIZING,
AHU1, !- name of an AIR PRIMARY LOOP object
sensible, !- type of load to size on
autosize, !- Design (minimum) outside air volumetric
flow rate {m3/s}
0.2, !- minimum system air flow ratio
7.22222241354578, !- Preheat design set temperature {C}
12.7777781162733, !- Central cooling design supply air
temperature {C}
37.7777787785472, !- Central heating design supply air
temperature {C}
noncoincident, !- Sizing Option
yes, !- Cooling 100% Outside Air
yes, !- Heating 100% Outside Air
0.008, !- Central cooling design supply air
humidity ratio {kg-H2O/kg-air}
0.008, !- Central heating design supply air
humidity ratio {kg-H2O/kg-air}
design day, !- cooling design air flow method
5.66400071906259E-04, !- cooling design air flow rate {m3/s}
design day, !- heating design air flow method
4.72000059921883E-04; !- heating design air flow rate {m3/s}
The program for some reason ignores the field "cooling design air flow
method" and looks only at
"cooling design air flow rate {m3/s}". If the latter is > 0 it uses it
as a user specified design flow rate.
Since this input is tiny (the actual number should be around 10 m3/s) it
basically zeros out the design flow rates. Ditto for heating.
Removing these numbers results in a more normal attempt at autosizing,
hampered by the lack of zone areas (no floors) in
2 of the zones. My run then aborts with temperature out of range. Some
serious geometry problems I guess.
On 12 Sep 2007 at 16:35, wenshufan1983 wrote:
> I'm confused that there is no chilled or hot water flow through the
> coils. According to Micheal's email to me, I've checked all these below
> 1.ZONE CONTROL:THERMOSTATIC to request heating/cooling from the
> HVAC system.
>
> 2.The HVAC controls must request flow in the the coil - could be a VAV
> terminal unit with built-in controls for a reheat coil, or a
> CONTROLLER:SIMPLE with a
> SET POINT MANAGER:*.
>
> 3.The coils must be ACTIVE components on their branches.
>
> 4.The loop pump must be scheduled on (or the schedule omitted completely).
>
> But there is still no flow in the report. Is any one by chance can
> help me out. My IDF file has been upload under Files:Problem
> Submittals:Gil_5.idf. Thanks
>
>
>
> 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 not allowed -- please post any files to the appropriate folder
> in the Files area of the Support Web Site.
>
> EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the
> Documentation link and press the "search" button.
>
> Yahoo! Groups Links
>
>
>
>
>
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 not allowed -- please post any files to the appropriate folder in the Files area of the Support Web Site.
EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
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