[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [EnergyPlus_Support] Primary-Secondary System zero flow issue

Autosizing does not currently work for the primary loop in a primary-secondary 
system.  In the next release (April 2007), primary-secondary systems will be 
able to be modeled using a single PLANT LOOP with no connection component.  
Autosizing will then flow through to the primary side.  Until then, you must 
specify the primary equipment capacities and flow rates.

Mike


On 16 Jan 2007 at 3:19, miaoworld wrote:

> Greetings,
> 
> I have a primary and secondary chilled water system, and I am keeping
> having zero flow.  I have specified the primary pump consumption and
> flow rate for the primary chilled water loop, but the primary loop and
> condenser loop (Autosized) is zero flow.
> 
> Any suggestions will be appreciated.
> 
> Thanks.
> 
> Miao(Eric)
> 
>    ************* Beginning System Sizing Calculations
>    ** Warning ** SizeCondDemandSide: Calculated Plant Sizing Design
> Volume Flow Rate=[0.00] is too small. Set to 0.0
>    **   ~~~   ** ..occurs for Condenser Loop=CHILLED WATER LOOP
> CONDENSER WATER LOOP
>    ** Warning ** SizeCondSupplySide: Calculated Plant Sizing Design
> Volume Flow Rate=[0.00] is too small. Set to 0.0
>    **   ~~~   ** ..occurs for Condenser Loop=CHILLED WATER LOOP
> CONDENSER WATER LOOP
>    ** Warning ** SizePump: Calculated Pump Nominal Volume Flow
> Rate=[0.00] is too small. Set to 0.0
>    **   ~~~   ** ..occurs for Pump=CHILLED WATER LOOP CNDW SUPPLY PUMP
> 
> 
>   ******Component sizing
> 
>  Component Sizing, CHILLER:ELECTRIC:EIR, CHILLER, Reference Evaporator
> Volumetric Water Flow Rate [m3/s],   0.0000    
>  Component Sizing, CHILLER:ELECTRIC:EIR, CHILLER, Reference Capacity
> [W],   0.0000    
>  Component Sizing, CHILLER:ELECTRIC:EIR, CHILLER, Reference Condenser
> Volumetric Water Flow Rate [m3/s],   0.0000    
>  Component Sizing, PUMP:CONSTANT SPEED, HOT WATER LOOP HW SUPPLY PUMP,
> Rated Volumetric Flow Rate [m3/s],  0.55510E-01
>  Component Sizing, PUMP:CONSTANT SPEED, HOT WATER LOOP HW SUPPLY PUMP,
> Rated Power Consumption [W],   14182.    
>  Component Sizing, PUMP:VARIABLE SPEED, CHILLED WATER LOOP CHW SEC
> SUPPLY PUMP, Rated Power Consumption [W],   158.35    
>  Component Sizing, CONDENSER LOOP, CHILLED WATER LOOP CONDENSER WATER
> LOOP, Volume of the condenser loop [m3],   0.0000    
>  Component Sizing, CONDENSER LOOP, CHILLED WATER LOOP CONDENSER WATER
> LOOP, Maximum Loop Volumetric Flow Rate [m3/s],   0.0000    
>  Component Sizing, COOLING TOWER:SINGLE SPEED, MAIN TOWER, Autosized
> design water flow rate [m3/s],   0.0000    
>  Component Sizing, COOLING TOWER:SINGLE SPEED, MAIN TOWER, Fan power
> at design air flow rate [W],   0.0000    
>  Component Sizing, COOLING TOWER:SINGLE SPEED, MAIN TOWER, Design air
> flow rate [m3/s],   0.0000    
>  Component Sizing, COOLING TOWER:SINGLE SPEED, MAIN TOWER, Autosized
> tower UA value at the design air flow rate [W/C],   0.0000    
>  Component Sizing, COOLING TOWER:SINGLE SPEED, MAIN TOWER, Air flow
> rate in free convection regime [m3/s],   0.0000    
>  Component Sizing, COOLING TOWER:SINGLE SPEED, MAIN TOWER, Tower UA
> value in free convection regime [W/C],   0.0000    
>  Component Sizing, PUMP:VARIABLE SPEED, CHILLED WATER LOOP CNDW SUPPLY
> PUMP, Rated Volumetric Flow Rate [m3/s],   0.0000    
>  Component Sizing, PUMP:VARIABLE SPEED, CHILLED WATER LOOP CNDW SUPPLY
> PUMP, Rated Power Consumption [W],   0.0000   
> 
> 
> 
> 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.idf and press the "search" button.
>  
> Yahoo! Groups Links
> 
> 
> 
> 
> 


========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
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 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.idf and press the "search" button.
 
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/

<*> Your email settings:
    Individual Email | Traditional

<*> To change settings online go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/join
    (Yahoo! ID required)

<*> To change settings via email:
    mailto:EnergyPlus_Support-digest@xxxxxxxxxxxxxxx 
    mailto:EnergyPlus_Support-fullfeatured@xxxxxxxxxxxxxxx

<*> To unsubscribe from this group, send an email to:
    EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/