[esp-r] Re: heat capacity

[Jon Hand]

A question about thermal capacity....

ESP-r does consider mass, it does this explicitly during the numerical solution based on
the material thermophysical properties of each layer of the construction.

ESP-r has been the subject of lots of validation studies (empirical and analytical) and
so it would be interesting to see what your model is indicating that is different from 'theory'.

And there are other factors which you many need to consider - have you correctly
defined the boundary conditions?  Is the movement of air in the room that you are
studying the same as the assumptions made in your model (the surface heat
transfer might not be correct).  If you are running your simulation at a one hour
timestep then you could try a shorter timestep - say 10 minutes.

-Jon Hand
________________________________________
From: esp-r-bounces at lists.strath.ac.uk [esp-r-bounces at lists.strath.ac.uk] On Behalf Of roberta.pischetola at libero.it [roberta.pischetola at libero.it]
Sent: 05 October 2010 16:33
To: esp-r at lists.strath.ac.uk
Subject: [esp-r]  heat capacity

Dear all,

I have a doubt about construction's database.

When I create a new construction does the software consider automatically the heat capacity of the surface?

I have to compare some constructions that have different heat capacity, but the results that I obtain are different from what I read in theory.



Someone can help me?



Thanks.

Best Regards.



Roberta Pischetola