[Equest-users] Humidity Control Causing High Fan Power?

[Stormy L. Shanks]

eQUEST Users,

I am modeling water source heat pumps for a LEED project. One of the LEED review comments indicated that I need to set the maximum humidity level to 55% in both the baseline and proposed models. When I do this for the proposed model, some of the fan power calculations become astronomically high. For example, check out the month of May for the heat pump below. This is from the SS-H report for one of my heat pumps. This goes back to normal when I take the humidity controls away, so I know this is caused by changing the max humidity from 100% to 55%. Does anyone have any idea of how to correct this? I've tried telling the system to use waste heat for space heating with no luck. I understand that's the way to simulate hot gas reheat on DX systems. 

      - -F A N   E L E C- - -   
                      MAXIMUM
              FAN         FAN
           ENERGY        LOAD
MONTH       (KWH)        (KW)

JAN          619.       0.855        
FEB          604.      14.934       
MAR          474.       0.855       
APR          338.      10.554        
MAY        11261.    9968.229      
JUN          587.     112.802        
JUL          530.     199.587        
AUG          668.     194.301        
SEP          389.      43.584        
OCT          426.      40.489        
NOV          567.      21.345        
DEC          610.       0.855        
       ----------  ----------  
TOTAL      17074.                    
MAX                  9968.229                   

Any ideas are much appreciated.

Stormy Shanks
Mechanical Engineer | shankssl at kjww.com
2882 106th Street | Des Moines, Iowa 50322
515.334.9906 | Direct: 515.334.4315 | Fax: 515.334.9908
www.kjww.com



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