[esp-r] Re: radiant and convective split for occupants

[Ferguson, Alex]

In my completely uninformed opinion, we should be setting the occupant
gains to 100% convective, unless we carefully model interior partitions
(and perhaps even furniture).

The actual radiant fraction may be closer to 30%, 40% or even 50%. But
few occupants have a clear view to the envelope from all sides; much of
these radiant losses will be transferred to the ceiling, floor, interior
walls and partitions, and perhaps even furnishings.  The temperatures of
these surfaces will be closer to the air-point and envelope
temperatures, and (I suspect) much of the radiant gain from the occupant
will be re-convected to the interior air.

But that's just my two cents, and I look forward to more informed
perspectives.

- Alex 



-----Original Message-----
From: esp-r-bounces at lists.strath.ac.uk
[mailto:esp-r-bounces at lists.strath.ac.uk] On Behalf Of Jon Hand
Sent: December 14, 2010 04:22
To: esp-r at lists.strath.ac.uk
Subject: [esp-r] radiant and convective split for occupants


I am updating some documentation about occupants in buildings related to
the radiant and convective split of sensible gains and I find that there
are a number of exemplar models that simply default to 50% radiant.  If
I look at the exemplar models that come with EnergyPlus I see most of
them are setting the radiant fraction of occupants to 30% and at least
one paper  mentioned 40%.

A Google search comes up with suggestions for what the sensible is but
mentions of how it is distributed seem to be well hidden.  In densely
populated spaces this must have an impact.

Does anyone have some or know about ...
 a) opinions that they would like to share
 b) some references that discuss this
 c) some papers that talk about it

Regards, Jon Hand
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