modification of output variable operative temperature

asked 2017-08-02 10:20:21 -0500

Soeren
61 ●2

Hi guys,

I am wondering if there is a possibility to modify an output variable, in my case Zone Operative Temperature. EnergyPlus 8.4 uses the standard calculation for

Operative Temperature = 0.5 * Mean Radiant Temperature + 0.5 * Mean Air Temperature

For calibration purposes I am interested to lower the radiative fraction in the equation and obtain a different operative temperature. Is there any way to do that in EnergyPlus?

Thank you very much, Sören

answered 2017-08-02 11:37:26 -0500

Molly Curtz
1348 ●3 ●12

updated 2017-08-02 11:38:48 -0500

You can do this with EMS. Refer to the EMS Application Guide for more info. For each zone where you want to calculate Your Custom Operative Temperature, you will need to create two EMS sensors: one to sense the Zone Mean Radiant Temperature output variable and another to sense the Zone Mean Air Temperature output variable. Because you want to report the output of your calculation, you will also need an EnergyManagementSystem:OutputVariable as well as an Output:Variable object that is set up to report the EnergyManagementSystem:OutputVariable that you created for each zone. For every zone of interest, you will write a short EMS program that will take the two sensor values, calculate Your Custom Operative Temperature. It can then be reported by the above mentioned objects. You will probably want to use the EMS Calling Point: "EndOfZoneTimestepAfterZoneReporting" for your program.