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Re: [EnergyPlus_Support] RE: EnergyPlus Humidifiers

 From the code:
WaterInEnthalpy = 2676125.d0 ! At 100 C
WaterAddNeededMax = MIN(WaterAddNeeded,Humidifier(HumNum)%NomCap)
AirOutEnthalpy=(AirMassFlowRate*Humidifier(HumNum)%AirInEnthalpy + 
WaterAddNeededMax*WaterInEnthalpy)/AirMassFlowRate
AirOutHumRat = (AirMassFlowRate*Humidifier(HumNum)%AirInHumRat + 
WaterAddNeededMax) / AirMassFlowRate
AirOutTemp = PsyTdbFnHW(AirOutEnthalpy,AirOutHumrat, 
'CalcElecSteamHumidifier')
HumRatSatOut = PsyWFnTdbRhPb(AirOutTemp,1.0d0,OutBaroPress, 
'CalcElecSteamHumidifier')


Peter Henniger wrote:
>
> I seemed to recall there not being a temperature rise. Possible my 
> model was not humidifying.
>
> Anyhow, what enthalpy, temperature or pressure of steam is being assumed?
>
> Many thanks
> Peter H
>
> -----Original Message-----
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx 
> <mailto:EnergyPlus_Support%40yahoogroups.com> 
> [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx 
> <mailto:EnergyPlus_Support%40yahoogroups.com>] On Behalf Of Richard 
> Raustad
> Sent: March 31, 2010 1:09 PM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx 
> <mailto:EnergyPlus_Support%40yahoogroups.com>
> Subject: Re: [EnergyPlus_Support] RE: EnergyPlus Humidifiers
>
> A quick review of the code shows that heat gain from the steam is
> accounted for. What are you seeing that makes you think otherwise?
>
> Richard Raustad wrote:
> > There is an item for steam humidifiers on the wish list, not sure when
> > it will get funded.
> >
> > Peter Henniger wrote:
> >>
> >> Linda
> >>
> >> Was wondering if it is in the works to update the Humidifier module
> >> to include other types, i.e. steam and evaporative types.
> >>
> >> It is a bit awkward having only electric, and the model doesn't
> >> account for heat gain from steam, or heat loss from evaporative.
> >>
> >> Regards
> >>
> >> Peter
> >>
> >> *From:* EnergyPlus_Support@xxxxxxxxxxxxxxx 
> <mailto:EnergyPlus_Support%40yahoogroups.com>
> >> [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx 
> <mailto:EnergyPlus_Support%40yahoogroups.com>] *On Behalf Of *Linda Lawrie
> >> *Sent:* March 26, 2010 3:12 PM
> >> *Subject:* [EnergyPlus_Support] Version 5 features (final draft)
> >>
> >> Version 5.0, Release April 2010
> >>
> >> Data Sets
> >> * New refrigerated case data set.
> >>
> >> Input
> >> * Slab and Basement preprocessors integrated to run automatically
> >> prior to EnergyPlus simulation
> >> * New "Unit Type" field for schedules to support units conversions of
> >> schedule values
> >> * Added ExternalInterface to connect to the Building Controls Virtual
> >> Test Bed using Ptolemy.
> >>
> >> Geometry/Window/Wall/Shading
> >> * 2-node ConductionFiniteDifferenceSimplified model added.
> >>
> >> Daylighting
> >> * Allow switchable windows like electrochromic windows to
> >> continuously dim, instead of only switching to fully dark state.
> >> Allows the zone to meet the maximum glare index while providing
> >> daylight for spaces.
> >>
> >> Zone Model
> >> * Analytical and Euler solution options for zone air heat balance 
> added.
> >>
> >> Natural and Mechanical Ventilation
> >> * Added minimum outdoor air flow rate operation controls to single
> >> and dual duct VAV air terminals.
> >> * Added maximum supply air flow rate during reheat to single duct VAV
> >> air terminal.
> >> * New object ZoneHVAC:OutdoorAir to describe outdoor air flow rate
> >> for use by other objects.
> >> * New ZoneVentilation:WindandStackOpenArea object calculates
> >> ventilation rates based on winds and stack effects.
> >> * Zone HVAC outdoor air unit module for make-up air and DOAS.
> >>
> >> HVAC and Refrigeration
> >> * Refrigeration loops can now model CO2 secondary loops.
> >> * Lighting in refrigerated cases revised to better match
> >> manufacturer's practices.
> >> * Zone-side impacts of refrigerant piping heat exchange added.
> >> * Default 'on' schedules for refrigerated cases and walk-ins added
> >> * Dual layer controls for radiant systems removed
> >> * Basin heater added to all chillers except absorption chillers.
> >> * Basin heater added to one and two speed cooling towers.
> >> * Pumps can ride curves based on pressure.
> >> * New steam baseboard with radiant heat.
> >> * New electric radiant/convective baseboard.
> >> * Added HVACTemplate:Zone:WaterToAirHeatPump and
> >> HVACTemplate:Plant:MixedWaterLoop
> >> * Standard rating (net) cooling capacity and SEER value reported for
> >> single speed DX cooling coil with air-cooled condenser.
> >>
> >> Electrical Systems
> >> * Improved methodology for electric load dispatch via the electric
> >> load center.
> >>
> >> Controls and User Functions
> >> * Enhancements to EMS including: system timestep built-in variable,
> >> detect unbalanced parentheses in Erl, custom schedule output, and
> >> coupling with ExternalInterface.
> >>
> >> On-Site Energy Supply
> >> * Wind turbine module (horizontal and vertical axis turbines).
> >>
> >> Output
> >> * New predefined output table for DX cooling coils as part of
> >> EquipmentSummary report summarize the calculated capacity and SEER
> >> values.
> >> * New simulations database table and tabular reports data added to
> >> SQL database output.
> >> * Added report variables for beam and diffuse solar radiation for
> >> blinds.
> >> * Users can turn off most surface variables to a minimal critical set
> >> with single command. Allows tremendous reduction in execution time
> >> for large projects with many surfaces.
> >>
> >> Utilities
> >> * New utility EP-Compare allows users to graphically compare results
> >> from two simulations.
> >> * IDF Editor supports IP units in schedules and other objects.
> >> * EP-Launch, IDF Editor, and WeatherConverter updates throughout.
> >>
> >> Documentation and Guides
> >> * Two new guides: Tips and Tricks Using EnergyPlus, and External
> >> Interface Application Guide.
> >> * Input/Output Reference and Engineering Reference updated and
> >> extended for all new features and updates. Total documentation now
> >> exceeds 4,700 pages.
> >> * New translation capability added to EnergyPlus web site allows
> >> translation into 50 languages.
> >>
> >> Validation and Testing
> >> * New testing report: EnergyPlus Testing with IEA BESTEST Mechanical
> >> Equipment & Control Strategies for a Chilled Water and a Hot Water
> >> System
> >>
> >> Platforms
> >> * Windows (XP, Vista, 7), Linux, Mac (tested for Snow Leopard)
> >>
> >>
> >
>
> -- 
> Richard A. Raustad
> Senior Research Engineer
> Florida Solar Energy Center
> University of Central Florida
> 1679 Clearlake Road
> Cocoa, FL 32922-5703
> Phone: (321) 638-1454
> Fax: (321) 638-1439 or 1010
> Visit our web site at: http://www.fsec.ucf.edu <http://www.fsec.ucf.edu>
>
> UCF - From Promise to Prominence: Celebrating 40 Years
>
> ------------------------------------
>
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov <http://www.energyplus.gov>
>
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/ 
> <http://groups.yahoo.com/group/EnergyPlus_Support/>
>
> Attachments are currently allowed but be mindful that not everyone has 
> a high speed connection. Limit attachments to small files.
>
> EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under 
> the Documentation link and press the "search" button.
> Yahoo! Groups Links
>
> 

-- 
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
1679 Clearlake Road
Cocoa, FL  32922-5703
Phone:   (321) 638-1454
Fax:     (321) 638-1439 or 1010
Visit our web site at: http://www.fsec.ucf.edu

UCF - From Promise to Prominence: Celebrating 40 Years



------------------------------------

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