[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [EnergyPlus_Support] A question about humidity



  Thanks very much. I will try it.

  Xu 
    ----- Original Message ----- 
    From: Richard J. Liesen 
    To: EnergyPlus_Support@xxxxxxxxxxxxxxx 
    Sent: Friday, June 11, 2004 9:15 PM
    Subject: Re: [EnergyPlus_Support] A question about humidity


    Hello,
    This is a very simple model and will probably be deprecated in the near 
    future with the addition of some new coil models.  This coil will remove 
    moiture from the air stream down to 95%RH, but it will not add moisture if 
    the conditions are dryer.

    I suggest that you use the COIL:Water:DetailedFlatCooling and use all of 
    the AutoSize parameters as in the example input file 
    "5ZoneWaterCooledDetCoil.idf".  The inputs look like:
       COIL:Water:DetailedFlatCooling,
         Main Cooling Coil 1,     !- Coil Name
         CoolingCoilAvailSched,   !- Available Schedule
         autosize,                !- Max Water Flow Rate of Coil {m3/s}
         autosize,                !- Tube Outside Surf Area {m2}
         autosize,                !- Total Tube Inside Area {m2}
         autosize,                !- Fin Surface Area {m2}
         autosize,                !- Minimum Air Flow Area {m2}
         autosize,                !- Coil Depth {m}
         autosize,                !- Fin Diameter {m}
         ,                        !- Fin Thickness {m}
         ,                        !- Tube Inside Diameter {m}
         ,                        !- Tube Outside Diameter {m}
         ,                        !- Tube Thermal Conductivity {W/m-K}
         ,                        !- Fin Thermal Conductivity {W/m-K}
         ,                        !- Fin Spacing {m}
         ,                        !- Tube Depth Spacing {m}
         ,                        !- Number of Tube Rows
         autosize,                !- Number of Tubes per Row
         Main Cooling Coil 1 Water Inlet Node,  !- Coil_Water_Inlet_Node
         Main Cooling Coil 1 Water Outlet Node,  !- Coil_Water_Outlet_Node
         Mixed Air Node 1,        !- Coil_Air_Inlet_Node
         Main Cooling Coil 1 Outlet Node;  !- Coil_Air_Outlet_Node
    You would have your own schedule and node connections.  This coil will give 
    you much more realistic behavior compared to the SimpleCoolingCoil.

    Thanks Richard Liesen



    At 01:33 AM 6/11/2004, Xu H.T wrote:
    >   HI, Mike,
    >
    >   I find in COIL:Water:SimpleCooling, the leaving relative humidity of 
    > coil is needed. Assume it's set to 95%, if it means the air relative 
    > humidity at the exit of coil is always 95%(constant) during the whole 
    > simulaiton?
    >
    >   Xu
    >     ----- Original Message -----
    >     From: Michael J. Witte
    >     To: EnergyPlus_Support@xxxxxxxxxxxxxxx
    >     Sent: Friday, June 11, 2004 12:27 AM
    >     Subject: Re: [EnergyPlus_Support] A question about humidity
    >
    >
    >     The supply air humidity ratio in the ZONE SIZING object is only used in
    >     calculating equipment sizes.  During the simulation, the supply air 
    > humidity
    >     ratio will vary according to the inlet conditions and the cooling coil
    >     performance.
    >
    >     Mike
    >
    >
    >     On 10 Jun 2004, at 11:25, Xu H.T wrote:
    >
    >     >   Dear,
    >     >
    >     >   The humidity control in the office room is assumed to be passive, 
    > meaning that
    >     >   only supply temperature is controlled. So I want to investigate 
    > the passive
    >     >   humidity level characteristic in the conditioned room.
    >     >
    >     >   For the simulation in E+, pump and fan need to input volumetric 
    > flow rate by a
    >     >   special numerical value, if Do the zone, system or plant sizing 
    > calculations
    >     >   are not set. In order to use the AUTOSIZE for the flow rate 
    > input, the RUN
    >     >   CONTROL should need to be set. However, in the Design Objects 
    > such as  Zone
    >     >   Sizing, the Zone cooling design supply air humidity ratio is also 
    > needed.
    >     >
    >     >   My aim is to investigate the humidity ratio for the supply air at 
    > different
    >     >   conditions. For example, I set the humidity ratio is 
    > 0.012kg-H2O/kg-AIR in
    >     >   Zone Sizing for cooling design. So, I wonder if this value in the 
    > zone supply
    >     >   inlet is constant (always 0.012kg-H2O/kg-AIR?), regardless of 
    > other condition
    >     >   changes such as outside air humidity ratio during the simulation 
    > in E+?
    >     >
    >     >   Thanks.
    >     >
    >     >   Rgs,
    >     >   Xu
    >     >
    >     >
    >     >
    >     >
    >     > [Non-text portions of this message have been removed]
    >     >
    >     >
    >     >
    >     >
    >     > The primary EnergyPlus web site is found at:
    >     > http://www.energyplus.gov
    >     >
    >     > The group web site is:
    >     > http://groups.yahoo.com/group/EnergyPlus_Support/
    >     >
    >     > Attachments are not allowed -- please post any files to the 
    > appropriate folder
    >     > in the Files area of the Support Web Site.
    >     >
    >     > Yahoo! Groups Links
    >     >
    >     >
    >     >
    >     >
    >     >
    >     >
    >
    >
    >
    >     ========================================================
    >     Michael J. Witte, GARD Analytics, Inc.
    >     EnergyPlus Testing and Support
    >     EnergyPlus-Support@xxxxxxxx
    >
    >
    >
    >     The primary EnergyPlus web site is found at:
    >     http://www.energyplus.gov
    >
    >     The group web site is:
    >     http://groups.yahoo.com/group/EnergyPlus_Support/
    >
    >     Attachments are not allowed -- please post any files to the 
    > appropriate folder in the Files area of the Support Web Site.
    >
    >
    >
    >           Yahoo! Groups Sponsor
    >                 ADVERTISEMENT
    >
    >
    >
    >
    >
    >----------------------------------------------------------------------------
    >     Yahoo! Groups Links
    >
    >       a.. To visit your group on the web, go to:
    >       http://groups.yahoo.com/group/EnergyPlus_Support/
    >
    >       b.. To unsubscribe from this group, send an email to:
    >       EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx
    >
    >       c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of 
    > Service.
    >
    >
    >
    >
    >[Non-text portions of this message have been removed]
    >
    >
    >
    >
    >The primary EnergyPlus web site is found at:
    >http://www.energyplus.gov
    >
    >The group web site is:
    >http://groups.yahoo.com/group/EnergyPlus_Support/
    >
    >Attachments are not allowed -- please post any files to the appropriate 
    >folder in the Files area of the Support Web Site.
    >
    >Yahoo! Groups Links
    >
    >
    >
    >




    The primary EnergyPlus web site is found at:
    http://www.energyplus.gov

    The group web site is:
    http://groups.yahoo.com/group/EnergyPlus_Support/

    Attachments are not allowed -- please post any files to the appropriate folder in the Files area of the Support Web Site.



          Yahoo! Groups Sponsor 
                ADVERTISEMENT
               
         
         


----------------------------------------------------------------------------
    Yahoo! Groups Links

      a.. To visit your group on the web, go to:
      http://groups.yahoo.com/group/EnergyPlus_Support/
        
      b.. To unsubscribe from this group, send an email to:
      EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx
        
      c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. 




[Non-text portions of this message have been removed]



------------------------ Yahoo! Groups Sponsor --------------------~--> 
Yahoo! Domains - Claim yours for only $14.70
http://us.click.yahoo.com/Z1wmxD/DREIAA/yQLSAA/dkFolB/TM
--------------------------------------------------------------------~-> 

The primary EnergyPlus web site is found at:
http://www.energyplus.gov

The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/

Attachments are not allowed -- please post any files to the appropriate folder in the Files area of the Support Web Site.
 
Yahoo! Groups Links

<*> To visit your group on the web, go to:
     http://groups.yahoo.com/group/EnergyPlus_Support/

<*> To unsubscribe from this group, send an email to:
     EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
     http://docs.yahoo.com/info/terms/