[esp-r] Re: Open Holes in Surface

[Jon Hand]

There MUST be a difference in a model prediction when
changing from a normal construction to one which uses the fictitious
material (unless the opening size is really really small) -

a) the high conductivity should result in quite a bit of heat transfer
b) the high solar transmission should allow in more solar gains (you should also
   be using the optical properties of fictitous)

ESP-r requires a zone to be fully bounded with polygons so it will
get very upset if the model is not bounded (e.g. you are trying to
heat the universe).  The typical approach is to make the construction
of the hole with something which has a high conductivity and low
density and high solar transmission and to set an infiltration rate
that reflects the likely level of air mixing.

And the idea about a flow network to enhance the flow through
an opening is a good idea.

-Jon Hand
________________________________________
From: esp-r-bounces at lists.strath.ac.uk [esp-r-bounces at lists.strath.ac.uk] On Behalf Of Hall Monika [monika.hall at fhnw.ch]
Sent: 10 March 2010 12:40
To: Walsh, Cormac; esp-r at lists.strath.ac.uk
Subject: [esp-r] Re: Open Holes in Surface

Hi Cormac,

you could calculate an open hole with an flow net work. You define with the flow net work an opening in the facade and conect this with an exterior note and the zone note.

Regards
Monika


________________________________
Von: esp-r-bounces at lists.strath.ac.uk [mailto:esp-r-bounces at lists.strath.ac.uk] Im Auftrag von Walsh, Cormac
Gesendet: Mittwoch, 10. März 2010 11:26
An: esp-r at lists.strath.ac.uk
Betreff: [esp-r] Open Holes in Surface

 Hi,
very simple question im sure, but im new to ESP-r,
modelling an industrial units energy consumption.

Is it possible to have a child surface in a zone which is just an open hole,
such as a vent hole? i have tried using the "ficticious" material,
but it seems to make no difference to the heat lossed from the building.

Thanks for any help,

Cormac Walsh,
University of Aberdeen