Re: [EnergyPlus_Support] Fan coil system problems

["Michael J. Witte" <mjwitte@xxxxxxxx>]

Please read the definition of "Zone/Sys Sensible Heating (cooling)" in the 
Input Output Reference.  It is the net heating/cooling provided to the space by 
the fan coil system.  The fan coil fan runs continuously whenever the fan coil 
availability schedule is >0.  If the fan coil unit provides outside air, then 
then the net result of outside air plus fan heat will be reported as Zone/Sys 
Sensible Heating (cooling) even if the coils are off.

If you require cycling fan operation, use the UNIT VENTILATOR.

The fan coil heating and cooling coil loads include the impact of outside air 
and fan heat.  If you want the simple heating and cooling loads for the zone 
only (without OA loads), use COMPACT HVAC:ZONE:PURCHASED AIR.

Mike


On 15 Nov 2007 at 8:30, beyangj wrote:

> Dear all,
> 
> I¡¯m modeling a building with a two-pipe fan coil system. There is no 
> two-pipe fancoil system in EnergyPlus, so I had to use uses a 
> ¡°fancoil unit:4 pipe¡± object in my simulation model.  I used the 
> dual setpoint with deadband thermostat controls and let the heating 
> and cooling coil schedules control the availability, but the 
> simulation results of  the variable ¡°Zone/Sys sensible heating 
> energy¡± showed that the system was supplying heating all the hours 
> in both summer and winter seasons, even beyond the working hours,  
> and the result of variable ¡°Zone/Sys sensible cooling energy¡± 
> showed that the system is supplying cooling in the working hours in 
> summer, but it  supplies both cooling and heating in some working 
> hours in winter, especially in the first working hour according to my 
> schedule. And also, I got the variables of  ¡°Total Water Heating 
> Coil Energy¡± and ¡°Total Water Cooling Coil Energy¡±, and these two 
> variables show that the coil operation for cooling in summer is right 
> according to my schedule, the ¡°Total Water Cooling Coil Energy¡±  is 
> zero in winter,  and the ¡°Total Water Heating Coil Energy¡± is zero 
> in summer too, but the coil for heating  only operated in the first 
> hour of some working days in winter. I don¡¯t know why these happen, 
> could you help me?
> 
> In addition, I¡¯d like to get the cooling load and heating load, can 
> I use the value of the ¡°Total Water Heating Coil Energy¡± and 
> ¡°Total Water Cooling Coil Energy¡± for the cooling load and heating 
> load?
> 
> Thanks in advance for your help!
> 
> Best Regards,
> 
> Young
> 
> 
> 
> 
> 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@xxxxxxxx





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Attachments are not allowed -- please post any files to the appropriate folder in the Files area of the Support Web Site.

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