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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/
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>[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/
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