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

[Shin-ichi Tanabe]

Dear Jian-lei Niu:
It takes a long time to reply.
I found a paper related this issue. It was old and no-pdf version, so I
scanned.
Angle factor of student seems 2-11% in the class room. 

Best regards

-----------------------
Shin-ichi Tanabe, Professor, Ph.D, FASHRAE
President of the ISIAQ Academy of Fellows 
Department of Architecture, Waseda University
3-4-1 Okubo, Shinjyuku-ku Tokyo 169-8555 Japan 
Tel +81-3-5292-5083 Fax +81-3-5292-5084

-----Original Message-----
From: Jian-lei Niu [BSE] [mailto:bejlniu at inet.polyu.edu.hk] 
Sent: Tuesday, December 14, 2010 10:17 PM
To: Jon Hand; esp-r at lists.strath.ac.uk
Cc: tanabe at waseda.jp
Subject: Re: [esp-r] radiant and convective split for occupants

Dear Jon,

I came to realize the limited data available sometime ago, when we wish to
model the radiant distribution from students in a classroom. We had
postulated that in case of stratified air distribution, this radiant
distribution affects the actual space cooling load more than in the well
mixed ventilation systems.

We tested with a direct radiation modeling method available in many CFD
package, which was only roughly described in the paper. 

Xu H.T, Gao NP , and JL Niu, "A method to generate effective cooling load
factors for stratified air distribution systems using floor level air
supply", International Journal of HVACR Research,  vol. 15, no. 5, 915-930,
Sept. 2009 

But it seems to me that a simplified engineering calculation method for
densely populated space is lacking. There are a few studies about the
radiant heat from a single human body, including the famous Fanger model
included in ASHRAE handbook, which  I guess is familiar to you, and some
studies from Japan, by Prof. Tanabe, and Nakano etc.

I wiould like to hear more about this from this community as well.

Regards
Jianlei Niu

>>> Jon Hand <jon at esru.strath.ac.uk> 12/14/2010 5:22 PM >>>

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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