[Equest-users] (no subject)

[Maryanne Mason]

Hi Christian

 

The miscellaneous section for the heat pump has values for the evaporator HX
and condenser HX. I assumed that these referred to the chiller itself,
however, there are actually two additional heat exchangers assumed in the
model (see attached schematic). Once I read through the schematic, I was
able to supply values to these fields that were more appropriate, and this
error went away.

 

 

Regards,

 

MaryAnne Mason 
Mechanical Engineer 
Process Infrastructure 
  
Ausenco Sandwell 
1016B Sutton Drive, Suite 100 
Burlington ON L7L 6B8 
Canada 
  
T   +1 905 319 1698 
F   +1  905 319 1801 
E    <mailto:maryanne.mason at ausencosandwell.com>
maryanne.mason at ausencosandwell.com 
W   <http://www.ausenco.com/> www.ausenco.com 

 

 

 

From: Christian Cianfrone [mailto:CCianfrone at morrisonhershfield.com] 
Sent: Wednesday, August 11, 2010 3:53 PM
To: maryanne.mason at ausencosandwell.com
Subject: 

 

Did you ever figure this error out?  I'm having a similar problem.. but no
luck solving it!  Any help would be appreciated.

 

 

I have been working on a model for a loop-to-loop heat pump system (to a

lake or well), and have been getting the following error message:

 

 

 

            Heat-Exchanger: New HP Chiller 1                 has

 

             inconsistent design parameters:

 

              QhxDesign   SupFlow     SupTi     SupTo

 

             -44451328.     3531.      88.1      63.0

 

                          DemFlow     DemTi     DemTo

 

                            2973.      63.1      93.0

 

 

 

The chiller design criteria is 31800000 cooling, with evap flow at 64 to 44

with 3169 gpm and condenser flow at 85 to 105 with 3743 gpm. The heat sink

for the condenser loop is intended to run from 75 F to 95 F at design

conditions.

 

 

 

I am assuming that the negative energy value above indicates that the values

refer to the chiller in heating mode. Can anyone suggest the most like

causes for this error?

 

Cheers,

 

Christian Cianfrone, M.A.Sc., P.Eng., LEEDR AP

Sustainable Design Specialist

ccianfrone at morrisonhershfield.com <mailto:email at morrisonhershfield.com> 

 

 <http://www.morrisonhershfield.com/Pages/default.aspx> logo4email4

 

Suite 600, 235 Yorkland Blvd.  |  Toronto, ON  M2J 1T1
Dir: 416 499 3181 x1364  |  Cell: 416 500 2179  |  Fax: 416 499 9658

 <http://www.morrisonhershfield.com/> morrisonhershfield.com

 

 

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