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.

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

Â

Check that your reporting frequency is detailed or timestep.

Mit freundlichen GrÃ¼Ã?en- Sent from my iPhoneÂ (excuse the brevity)

i. A.
Jean Marais
b.i.g. bechtold
Tel. Â +49 30 6706662-23

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

Â

Dear All,

Â

I refer to the idf (CoolingTowerWetBulbRangeOp.idf) that comes with E+ example files, that I have manipulated its "CondenserEquipmentOperationSchemes"Â 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.

Â

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.

Â

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

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

Â

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

Â

Change 1/2

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

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

Change 2/2

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

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

No other changes thatn the above twoÂ on the idf.

Â

Regards,

Â

T

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