Re: [EnergyPlus_Support] Steam Boiler GetSpecificHeatGlycol warning

[Richard Raustad <RRaustad@xxxxxxxxxxxx>]

Did you use the correct pump?

Pump:VariableSpeed:Condensate,
       \memo This pump model is described in the ASHRAE secondary HVAC toolkit.
       \memo Variable Speed Condensate pump for Steam Systems

It can be frustrating to manually create plant loops. But really, they are not that hard to understand. For example, I have used this " single cooling and heating plant" many times to connect to a single water based equipment model (usually VRF). Bottom line, since I already have this plant available it is very easy to add to any input file using macro language.

 ##fileprefix C:\MyProjects\EnergyPlus\EnergyPlus\Inputs\
 ##include VRFSinglePlantLoopBoilerTower.idf

The only connection between this stand alone plant input file and the main input file is here (this is in the main input file):

  AirConditioner:VariableRefrigerantFlow,
    VRFCondInNode,           !- Condenser Inlet Node Name
    VRFCondOutNode,          !- Condenser Outlet Node Name


I'm including both files for review.

Main input file: VariableRefrigerantFlow_5Zone_HeatRecovery_WaterCooled.imf
Plant library:  VRFSinglePlantLoopBoilerTower.idf

Using this method, basically from a library of plant configurations, it becomes easy to implement.


I developed the PTAC model in E+ and do not understand your comment on configuration.

On 3/14/2013 5:18 PM, Edward G. Lyon wrote:

I cobbled together a steam boiler system by robbing 5ZoneSteamBaseboard.idf so I could supply one steam baseboard in my model.  I now fully understand how little I know about piecing together a functional mechanical system from EnergyPlus components without using templates (translation: what a pile of junk to add just to run a little radiator).  I did not autosize anything because I know the radiator flow rate already.  PlantPumps:CalcPumps is throwing a GetSpecificHeatGlycol warning because it has a 107C temperature fluid.  I suspect that the plant is so oversized that it supplies steam to the pump, but I would appreciate any suggestions for resolving this without reverting to an autosized solution.

 

Also, any references that simply explain how to take a set of fans, pipes, and coils in a box and make the appropriate nodes, loops, branches and controls for EnergyPlus would be appreciated, I’ve never seen a PTAC in the field that actually looks like the EnergyPlus PTAC  most people use, so I should probably build my own…  

 

Ned Lyon, P.E. (MA, WV)
Staff Consultant

SIMPSON GUMPERTZ & HEGER 
     | Engineering of Structures and Building Enclosures

41 Seyon Street, Bldg. 1, Suite 500
Waltham, MA 02453

781.907.9000 main
781.907.9350 direct 
781.907.9009 fax
www.sgh.com

-- 
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
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Phone:   (321) 638-1454
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Attachment not found:
d:\eudora\attach\VRFSinglePlantLoopBoilerTower2.idf

Attachment not found:
d:\eudora\attach\VariableRefrigerantFlow_5Zone_HeatRecovery_WaterCooled1.imf