Updating ref. temp. in convection term of EnergyPlus zonal balance Equation

asked 2016-05-24 20:31:48 -0500

Himanshu
11 ●1

updated 2020-01-25 18:16:47 -0500

__AmirRoth__

4436 ●5 ●17 http://bleedinggreenna...

Hi,

I am looking to pass a user defined value of "Reference Temperature" for the calculation of the convection load in the zonal energy balance equation given on page-25(bottom)of the manual. https://energyplus.net/sites/all/modu...

I am aware of creating the ExternalInterface:Schedule object in the idf but how can I use this object in idf file to specify the new user input reference temperature?
Am I approaching correctly to what I want to achieve or is there any other way.I hope I am clear with my question.Any advice from the community will be really helpful. Thanks in advance.

Regards

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It's not clear what you mean by "Reference Temperature". Do you mean the equation at the top of this page? If so, convection is calculated from the difference of the surface temperature and the zone temperature. Are you referring to one of these?

Neal Kruis ( 2016-05-25 09:58:01 -0500 )edit

Hi, Neal , Yes, I mean the top equation of this page and particularly about the convection term in the equation. I want to change the Reference temperature in the convection load calculation to a user defined value. Can I do it by defining externalInterface schedule object.

Himanshu ( 2016-05-25 10:32:57 -0500 )edit

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answered 2016-05-25 11:43:43 -0500

Archmage

7185 ●3 ●11

The SurfaceConvectionAlgorithm:Inside:UserCurve object can switch between a few different definitions for reference temperature but I don't think there is a way to override the value.

The other way would be to control the surface heat transfer coefficient. If you have a method for predicting the reference temperature along with the accompanying Hc, you should be able to back out a result for a new Hc that has the same convective power when evaluated using the reference temperature as formulated in the model. You can schedule convection coefficients using the SurfaceProperty:ConvectionCoefficients object, or set them dynamically using EMS actuators.

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I had a thought of what you are suggesting but its not balancing the things out in my case, which could be because of prediction accuracy or could be any other reason. Let see if I can work around the way. Thanks for the response.

Himanshu ( 2016-05-26 13:01:01 -0500 )edit

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Updating ref. temp. in convection term of EnergyPlus zonal balance Equation

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Updating ref. temp. in convection term of EnergyPlus zonal balance Equation