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Thermostat setpoint at peak load is 0

asked 2015-04-24 15:36:09 -0600

jmcneill's avatar

updated 2017-05-03 19:10:34 -0600

__AmirRoth__'s avatar

I'm running the RefBldgHospitalNew2004_Chicago.idf example file on EnergyPlus v8.2-Update 1 and noticing that the HVAC Sizing Summary: Zone Cooling and Zone Heating: Thermostat Setpoint Temperature at Peak Load is 0 C.

image description

The hourly variables for Thermostat Cooling Setpoint Temperature and Thermostat Heating Setpoint Temperature are between 18 and 25 C.

I've noticed this in other models that I have run. Any ideas on why this value is 0?

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If you don't get a response here you might want to take this to the EnergyPlus helpdesk.

macumber's avatar macumber  ( 2015-04-28 17:36:38 -0600 )edit

I have the same problem in some simulations!

Geraldo Pithon's avatar Geraldo Pithon  ( 2015-04-29 20:28:18 -0600 )edit

my observation (or suspicion) is that sometimes a zero value is displayed as output when values are actually missing, e.g. in ResultsViewer.

OS-user-AT's avatar OS-user-AT  ( 2015-07-17 13:13:26 -0600 )edit
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answered 2015-07-22 18:08:31 -0600

rraustad's avatar

updated 2015-08-23 06:20:06 -0600

Jamie Bull's avatar

This is a result of using ThermostatSetpoint:DualSetpoint. Since there are two set point temperatures, one for cooling and one for heating, the choice of which of those temperatures to use for reporting was never included (coded) such that this specific table had non-zero values. Change to the single cooling and heating set point (or cooling or heating only) type and you should see the non-zero data.

Here's a view of the table after correcting the problem: C:\fakepath\CorrectedZoneTempSP_HVACSumaryTable.jpg

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@rraustad thanks for the answer! This one had been bugging me for a while.

ericringold's avatar ericringold  ( 2015-07-22 18:17:58 -0600 )edit

Github issue #5048 https://github.com/NREL/EnergyPlus/is...

rraustad's avatar rraustad  ( 2015-07-27 08:43:06 -0600 )edit
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Asked: 2015-04-24 15:36:09 -0600

Seen: 739 times

Last updated: Aug 23 '15

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