Re: [EnergyPlus_Support] Question about Cooling Tower

["Edward Lyon" <eglyon@xxxxxxx>]

A pump with 0 efficiency can not move water without using infinite
power.  My guess is that if you give CONDPUMP a real world efficiency,
all the errors will go away......

Ned Lyon

Senior Project Manager
Simpson Gumpertz & Heger Inc.

41 Seyon Street
Building #1, Suite 500
Waltham, MA  02453

Phone:  781-907-9000
Fax:  781-907-9009


>>> herreroprada@xxxxxxxx 6/15/2004 12:20:21 PM >>>
Hello all,

I am having some problems while simulating condenser
loop water cooled with a cooling tower. I am
autosizing everything (plant sizing), except the
Design Water Flow rate (m3/s) which has to be the same
that appears in the chiller object, in the field:
Design Condenser Volumetric Flow rate (m3/s)

But, althouth I have tried with different options (as
creating a schedule for a Condenser Temperature
Setpoint node in the Condenser Loop object or just
typing AIR to use the outdoor air wet-bulb as the
setpoint, as i have seen in the example files) I keep
getting the same errors:

** Warning ** Check input. Pump nominal power or motor
efficiency is set to 0, for pump=CONDPUMP
   ** Warning ** Check input. Pump nominal volumetric
flow rate is set or calculated = 0, for pump=CONDPUMP
   ** Severe  ** COOLING TOWER:SINGLE SPEED "TOWER".
Free convection air flow rate must be less than the
design air flow rate.
   ** Severe  ** COOLING TOWER:SINGLE SPEED "TOWER".
Free convection UA must be less than the design tower
UA.
   **  Fatal  ** Errors found in Cooling Tower input


I do not understand what is going on. I have also
autosized the condenser pump and I have tried by
changing the exit temperature and the delta
temperature in the plant sizing object for the
condenser plant.

I am sure i am missing something. Could anybody tell
me what it is?

Thanks a lot,

Carmen.


            
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