[esp-r] Re: Question on optical database

[Jon Hand]

I suspect you have a corrupted optics.db1.  The standard version has many more
sets of optics.  Really the only difference between optics.db1 and optics.db2 is
additional documentation and more decimal places in the data.  Models should
be using optics.db2 rather than optics.db1.

There was a recent patch made to ESP-r related to the not-matching optics warning.
The code is a bit smarter now.

A model might simulate (not blow up) but that does not necessarily mean that
the predictions are correct. The simulator is designed to scan the model
zone construction and tmc files and use the information in those files so
it is not particularly dependent on the databases existing.  

If you change the model and update the zone construction and tmc files then the database
information will be scanned and at that point problems in the databases might impact
your model.

-Jon Hand

________________________________________
From: esp-r-bounces at lists.strath.ac.uk [esp-r-bounces at lists.strath.ac.uk] On Behalf Of Sigalas, G. [g.sigalas at student.tue.nl]
Sent: 23 February 2011 12:28
To: esp-r at lists.strath.ac.uk
Subject: [esp-r]  Question on optical database

Dear esp-r users,

I have a question regarding the optical database of esp-r.

If I open one of the exemplar models (e.g. basic 1 zone with convective heating & basic control), I have a model that uses external double glazing  construction ‘’dbl_glz’’.

>From the database maintenance-> Constructions db -> dbl_glz  I can see that my construction has an optical property ‘’DCF7671_06nb’’

Surprisingly this optical property is not in the optical database ‘’optics.db2’’. The only optical properties available are S properties (‘’SC_8985’’   up to ‘’SAZ5060’’). However, the simulation can be performed normally, even though the construction and optical properties do not match.

The weird thing is that if I go to the ‘’surface attributes’’ and change the current glazing construction dbl_glz but select the same construction again, then I get an error message (Optics in geo file do not match etc….). Even though I use the same construction as before.

In the esp-r  database folder there are two optical properties databases, db1 and db2. In db1 there are only S properties and in db2 there are all the properties (S and D). Strangely, even though in the esp-r menu the optical database is ‘’optics.db2’’, the values are the one from db1 (only S properties)! If I change the optical database to db2 the simulation can be run without errors.

My question is how can the initial simulation be run with different construction and optical properties and why in esp-r I see only S optical properties since in optics.db2 there are  S and D properties?

I am using esp-r 11.9 through cygwin in windows 7 32bit.

Thank you,
Georgios Sigalas