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Evaluate accumulated heat energy in a domain

Posted Jan 19, 2018, 5:28 a.m. EST Heat Transfer & Phase Change, Results & Visualization Version 5.3a 2 Replies

Alessandro Hülser
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Hello community,

I am working on a "heat tarnsfer in solids" study.

What I need is the accumulated heat energy in a domain. I´m not looking for energy balances etc (which is discussed here https://www.comsol.com/blogs/how-to-calculate-mass-conservation-and-energy-balance/) but only for the energy in ONE domain.

I need to see how the energy content of that domain changes with the time. The unit I want to work with is Ws (or MWh).

Please can anybody help me? In the predefines variables I can´t find the right one.

Thanks!

Alessandro

2 Replies Last Post Jan 19, 2018, 9:14 a.m. EST
Alessandro Hülser
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Posted: 6 years ago Jan 19, 2018, 6:44 a.m. EST

...to specify my problem...

In the beginning my domain has the temperatur T_0

The Energy Q_0=0

from t_0 to t_1 the from differenz sources heatfluxes camo into my domain. So also the Temperatur changes:

Q_1=rho * V * cP * (T_1-T_0)

Is there a variable to show this in COMSOL?

...to specify my problem... In the beginning my domain has the temperatur T_0 The Energy Q_0=0 from t_0 to t_1 the from differenz sources heatfluxes camo into my domain. So also the Temperatur changes: Q_1=rho * V * cP * (T_1-T_0) Is there a variable to show this in COMSOL?
Edgar J. Kaiser Certified Consultant
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Posted: 6 years ago Jan 19, 2018, 9:14 a.m. EST

Alessandro,

you have to do a volume integration of heat density in that specific domain. The way to do that is in the knowledge base article you cited. You may need to use the at() operator to access the solution at t0 and t1.

Cheers Edgar

-------------------
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
Alessandro, you have to do a volume integration of heat density in that specific domain. The way to do that is in the knowledge base article you cited. You may need to use the at() operator to access the solution at t0 and t1. Cheers Edgar

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