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Re: [EnergyPlus_Support] dual setpoint with deadband thermostat/furnace control problems
Change these 2 report variables to hourly and change the run control
object to only do the design days.
Report Variable,
*, !- Key_Value
Furnace Fan Part-Load Ratio, !- Variable_Name
timestep; !- Reporting_Frequency
Report Variable,
*, !- Key_Value
Furnace Compressor Part-Load Ratio, !- Variable_Name
timestep; !- Reporting_Frequency
RUN CONTROL,
Yes, !- Do the zone sizing calculation
Yes, !- Do the system sizing calculation
Yes, !- Do the plant sizing calculation
Yes, !- Do the design day simulations
No; !- Do the weather file simulation
You will see that the simulation is maintaining the set points
correctly. 20C in winter and 25C in summer just
as your compact HVAC thermostat requested.
COMPACT HVAC:THERMOSTAT,
Thermostat, !- Thermostat Name
, !- Thermostat Heating Setpoint Schedule
20.0000005298191, !- Thermostat Constant Heating Setpoint {C}
, !- Thermostat Cooling Setpoint Schedule
25.0000006622738; !- Thermostat Constant Cooling Setpoint {C}
If you make an annual run and see a time when both heating and cooling
occur, it is because the simulation ran at a
reduced time step and you are seeing the average values over the hour.
Use a detailed
time step to see what is happening during these times. Example:
Report Variable,
*, !- Key_Value
Furnace Fan Part-Load Ratio, !- Variable_Name
detailed; !- Reporting_Frequency
Make all your report variables "detailed" so the info lines up in the
csv file.
And make the run period smaller to reduce the size of the output file:
RunPeriod,
5, !- Begin Month
1, !- Begin Day Of Month
7, !- End Month
31, !- End Day Of Month
UseWeatherFile, !- Day Of Week For Start Day
Yes, !- Use WeatherFile Holidays/Special Days
Yes, !- Use WeatherFile DaylightSavingPeriod
No, !- Apply Weekend Holiday Rule
Yes, !- Use WeatherFile Rain Indicators
Yes, !- Use WeatherFile Snow Indicators
1; !- Number of years of simulation
darthskunky wrote:
> I'm modeling a fairly simple home that's around 1800 square feet with
> a COMPACT HVAC furnace (set up mostly to autosize.) I've been having
> trouble figuring out what's going on with the thermostat, which I
> believe is has a control type of dual setpoint with deadband, which is
> what I want. I set the heating to 68 and the cooling to 77.
> Nevertheless, looking at my hourly data, there seem to be days when
> the heating and cooling systems are directly opposing eachother.
> Would someone be willing to look at my files to see what's going on?
> I'm new to EnergyPlus and have been having numerous problems obtaining
> anything close to what seem like valid outputs. My input file is
> pretty simple, so troubleshooting might not be too hard. I'll upload
> the files. The idf is called habitatcomposite. If someone could help,
> I would be incredibly grateful, as I need to get this figured out
> pretty soon. Thanks a lot!
> MC
>
>
>
>
>
>
>
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--
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
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