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[EnergyPlus_Support] Re: PTHP dehumidification

Have uploaded file as it stands to the group

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "careym.cosmaj" <mark.carey@...> wrote:
>
> Don thanks for the pointers.
> 
> Was using eplus v4 at work am now working with v5 from home.
> 
> Have had a look and run the 5ZoneWaterCooled_HighRHControl.idf example file. When set to simulate for a full year the eso output doesnt inspire confidence in the example, (even when run with the Ohare epw file) the output does not limit the max SPACE2-1 (the dehumidified space) RH to 50%.
> 
> Despite this I have taken the file, stripped out anything not related SPACE2-1, converted the chiller to air cooled, changed the pumps and fans to constant speed, removed the reheat coil, removed the SetpointManager:Scheduled added SetpointManager:SingleZone:Cooling and SetpointManager:SingleZone:Heating with the cooling and heating setpoint managers operating on seperate nodes (the humidity min/man setpoint managers operate on the same node as the cooling setpoint manager) and attempted to use the resulting system to dehumidify a geometry model of my making.
> 
> The resulting simulation runs without error (only 2 warnings related to not specifying ground temps, and not hooking the chiller condenser air inlet node up) and controls temperature between the specified limits, the SVG output appears correct.  However dehumidification still doesnt work.
> 
> Any suggestions?
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Don Shirey <shirey@> wrote:
> >
> >   Regarding water-based air handlers doing dehumidification, look at 
> > example file = 5ZoneWaterCooled_HighRHControl.idf
> > 
> > Note the use of ZoneControl:Humidistat, 
> > SetpointManager:SingleZone:Humidity:Maximum and Controller:WaterCoil.
> > 
> > 
> > 
> > On 9/17/2010 8:44 AM, Don Shirey wrote:
> > >    Which version of EnergyPlus are you using?
> > >
> > > Figure 130 in the Input-Output Reference for version 5.0 (latest) is
> > > "Schematic of the Balanced Flow Desiccant Heat Exchanger"... not
> > > Packaged Terminal Heat Pump.
> > >
> > >
> > >
> > > On 9/17/2010 12:29 AM, mark.carey@ wrote:
> > >> Apologies if this arrives twice - posting from the web interface and original post isnt shwing up.
> > >>
> > >> Simulating a building to get comparitive energy consumptions for with and without humidity control.
> > >>
> > >> Humidification using a Humidifier:Steam:electric appears straightforward.
> > >>
> > >> Have a model working with PHTPs giving results for temperature.  IO ref Figure 130 implies that a PTHP will do dehum (cooling coil before heating coil) however it only takes a Thermostat input.  IO ref page 1198 suggests that if a ZoneControl:Humidistat is added and if my equipiment is capable of dehumidifying it will (however ESO output shows uncontrolled RH within the zone).  Has anyone had any sucess getting a PTHP to dehumidify?
> > >>
> > >> It doesnt appear to be possible to take the expanded idf from the PTHP and change the controller as there does not appear to be a suitable controller that will operate with RH priority driving the cooling coil and then use the reheat coil to maintain space temperture (as would be the case practically with a water based air handler with cooling and heating coils).  What controller type have people had sucess using with water based air handlers doing dehum?
> > >>
> > >> Any suggestions greatly appreciated.
> >
>




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