[EnergyPlus_Support] Re: How to model a HVAC system with both cooling and heating function?

["adahoilam" <i50447973@xxxxxxxxx>]

I have sent a zipped input files to the email <energyplus-
support@xxxxxxxx> together with some explanations on them.

Thanks for your kind attention.

Ada

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "adahoilam" 
<i50447973@...> wrote:
>
> The HVAC system I am using was a dummy fan coil unit air system 
plus 
> a purchased chilled/hot water system.
> 
> In the air system, I have added all necessary controllers (include 
> pretreat cooling coil, cooling coil, reheating coil and heating 
> coil, outside air) and set point managers, but I havent added set 
> point manager for the heating coil. Do I need to add this?
> 
> I used SINGLE DUCT:CONST VOLUME:REHEAT for air supply system.
> 
> On the other hand, I used purchased water systems for both chilled 
> water and hot water supplies to the COIL:Water:Cooling and 
> COIL:Water:SimpleHeating, together with plant autosizing items for 
> both systems.
> 
> Lastly, I have a file to do zone autosizing. And used a thermostat 
> called "Dual Setpoint with deadband".
> 
> There was no problem when I used cooling only, however, energy 
> sizing data were so small in the heating part when I added heating 
> coil for the whole HVAC system.
> 
> Hope these information can help you to understand my case study.
> 
> Thank you for your help.
> 
> Ada
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte" 
> <mjwitte@> wrote:
> >
> > It is difficult to know what to suggest.  What type of HVAC 
system 
> are you 
> > modeling?  What EnergyPlus HVAC and control components are you 
> using?  Did you 
> > add a controller and set point manager for the hot water coil?  
> What type of 
> > thermostat controls are you using?
> > 
> > Mike
> > 
> > 
> > On 6 Dec 2007 at 7:43, adahoilam wrote:
> > 
> > > I am now working on a HVAC system modeling for a building in 
> China, I 
> > > tried to use the existing model (with cooling function only) 
to 
> modify 
> > > to a model can suit hot summer and cold winter seasons.
> > > 
> > > However when I added purchased hot water and set a heating 
coil 
> in the 
> > > air system into the original model, the data of Heating: 
> Purchased 
> > > heating (J) was so small.
> > > 
> > > Is there any problem for my setting? How can I fix this 
problem 
> to 
> > > increase the heating load?
> > > 
> > > And now the cooling:Purchased cooling results also not 
> satisfactory 
> > > (says 1XXX watt hourly, but I may need 3XXX watt hourly), if I 
> want to 
> > > make the simulation results closer to my measurement data, 
which 
> > > parameter(s) could I change to achieve more significant 
results?
> > > 
> > > 
> > > 
> > > 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.
> > > 
> > > EnergyPlus Documentation is searchable.  Open 
EPlusMainMenu.pdf 
> under the
> > > Documentation link and press the "search" button.
> > > 
> > > Yahoo! Groups Links
> > > 
> > > 
> > > 
> > > 
> > > 
> > 
> > 
> > ========================================================
> > Michael J. Witte, GARD Analytics, Inc.
> > EnergyPlus Testing and Support      
> > EnergyPlus-Support@
> >
>




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