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Thermostat setpoint at peak load is 0

asked 2015-04-24 15:36:09 -0500

updated 2017-05-03 19:10:34 -0500

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 gravatar imagemacumber ( 2015-04-28 17:36:38 -0500 )edit

I have the same problem in some simulations!

Geraldo Pithon gravatar imageGeraldo Pithon ( 2015-04-29 20:28:18 -0500 )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 gravatar imageOS-user-AT ( 2015-07-17 13:13:26 -0500 )edit

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answered 2015-07-22 18:08:31 -0500

updated 2015-08-23 06:20:06 -0500

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.

Eric Ringold gravatar imageEric Ringold ( 2015-07-22 18:17:58 -0500 )edit
rraustad gravatar imagerraustad ( 2015-07-27 08:43:06 -0500 )edit

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Asked: 2015-04-24 15:36:09 -0500

Seen: 423 times

Last updated: Aug 23 '15