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Re: [EnergyPlus_Support] CoolingTowerWetBulbRangeOp.idf issue





Hi Jean,

I used timestep=24 (was 4), still the flow in the BigTower1 and 2 is still equal, irrespective of the Wet bulb variation schedule. So there is something else.

Any other idea please.

T


On Fri, Jan 30, 2015 at 6:12 PM, 'jeannieboef@xxxxxxxxx' jeannieboef@xxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
 

Check that your reporting frequency is detailed or timestep.

Mit freundlichen Grü�en- Sent from my iPhone (excuse the brevity)

i. A.
Jean Marais
b.i.g. bechtold

On 30.01.2015, at 02:25, "tilek.aberra@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

 

Dear All,

 

I refer to the idf (CoolingTowerWetBulbRangeOp.idf) that comes with E+ example files, that I have manipulated its "CondenserEquipmentOperationSchemes" to investigate how the branch flow rate varies based on outdoor WBT. However, I witnessed equal flow rate in the two CoolingTower branches irrespective of the WBT schedules.

 

Is this a bug or am I missing the point the scheme s meant to be. I have attached the file which I have modified a bit to investigate the above.

 

Further (this one is a general question), I thought that if I set "PlantOnSched=0" I expect the mass flow rate for the pump in the respective plant would be zero; however, I am not seeing this. As below for instance

Schedule:Compact,
    PlantOnSched,            !- Name
    Fraction,                !- Schedule Type Limits Name
    Through: 12/31,          !- Field 1
    For: AllDays,            !- Field 2
    Until: 24:00,0.0;        !- Field 3

 

Again, am I missing the point or is there something else that needs to be adjusted?

 

PS: Sorry, somehow I am unable to attach the modified idf, so I just cut and pasted the sections I changed on the original idf from E+ installation.

 

Change 1/2

=======================================================
  PlantEquipmentOperation:OutdoorWetBulb,
    Year Round Tower Operation,  !- Name
    -50,                     !- Wet-Bulb Temperature Range 1 Lower Limit {C}
    5,                      !- Wet-Bulb Temperature Range 1 Upper Limit {C}
    All Towers,              !- Range 1 Equipment List Name
    5,                      !- Wet-Bulb Temperature Range 2 Lower Limit {C}
    70,                      !- Wet-Bulb Temperature Range 2 Upper Limit {C}
    One Tower;               !- Range 2 Equipment List Name

=======================================================

Change 2/2

=======================================================
  CondenserEquipmentList,
    All Towers,              !- Name
!    CoolingTower:SingleSpeed,!- Equipment 1 Object Type
!     Big Tower1,              !- Equipment 1 Name
    CoolingTower:SingleSpeed,!- Equipment 2 Object Type
    Big Tower2;              !- Equipment 2 Name

=======================================================

No other changes thatn the above two on the idf.

 

Regards,

 

T





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Tilek Aberra,
12 Bainton Pl., Doonside,
Sydney, Australia
ph:   +61 (0)2 9534 4731 (home)
         +61 (0)2 8805 0421 (office)
mo:  +61 (0)4 3959 5937


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Posted by: Tilek Aberra <tilek.aberra@xxxxxxxxx>


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