[esp-r] Re: absorption rate

[Jon Hand]

In the following email it is not clear whether  'absorption rate' is the long wave
emissivity or solar absorption.  These are both properties of the materials used in
the constructions. The best place to alter these properties is to
go to the database management facility and to create (or copy and edit) the
constructions used in the zone and to reference materials which have the
properties you want to study.  

After you have created one or more variant constructions you can then
use the surface attributes menu to associate a new construction with
the zone surfaces of interest.  Prj will then ask if the zone construction
files should be updated (say yes).

Confirm that the changes have been made by generating a model contents
report - in the last section of the report you should see the surface properties.

To make it easier to compare you could have a model with two zones
which are identical except for the constructions used.  Then you can
study the energy balance of both zones to look for the differences.

If there is a longwave radiant gain in the room (e.g. a casual gain with a
strong radiant fraction) which turns on and off you should notice the
surfaces with high longwave emissivity getting warmer quicker than
surfaces which have a low longwave emissivity.

-Jon Hand
________________________________________
From: esp-r-bounces at lists.strath.ac.uk [esp-r-bounces at lists.strath.ac.uk] On Behalf Of Mori Taro [taro.3tree at gmail.com]
Sent: 06 June 2011 10:33
To: esp-r at lists.strath.ac.uk
Subject: [esp-r]  absorption rate

Hi

I'm new to esp-r
I study the effect of absorption rate on the thermal environment now.
I changed the absorption rate of each walls by "surface attributes" in
"geometry & attribution"

The results show that each surface temperatures in high absorption rate
are higher than that in low absorption rate, but room temp in high abs
rate is lower than that in low abs rate.
I think I need to work more about the model, but I can't search this
kind of issue in cookbook.

1. How do I set absorption rate of each walls?
2. Are there additional work after I set absorption rate?

regards

Taro, Hokkaido Univ. Japan

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