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Reporting the g-value is a necessary requirement for compliance with
CIBSE TM33:2006 (and later). ESP-r just reports the g-value and does
not perform any calculations based on it like Achim mentioned. You
can report g-values using ESP-r for user defined fenestration
systems (there is some help available in the interface) by choosing
view g-value > choose a construction type > user defined. <br>
<br>
Calculation of g-value is derived from BS EN 410:1998<br>
<br>
-Aizaz<br>
<br>
<br>
On 01/10/2011 08:04 PM, Achim Geissler wrote:
<blockquote
cite="mid:EA5ABD42-B858-471D-B05E-C0BB8510F967@intergga.ch"
type="cite">Dear Hee
<div><br>
</div>
<div>the g-value of a glazing is a "derived quantity" and is not
explicitly entered in the construction (or anywhere in an ESP-r
model). You enter solar absorption and transmission for each
glass pane for a given glazing system for 5 angles of radiation
incidence (the values for an IGU of interest can be generated by
"3rd programs" such as LBNL Window or WIS). The (effective) heat
gain through the glass is then calculated during run-time
depending on the time step solar radiation incidence angle and
surrounding air and surface temperatures. This will usually
never be the same as the g-value you get from a glass supplier
due to the fact that the supplier value is for perpendicular
radiation on the glazing surface and also disregards air
temperature differences either side of the glass.</div>
<div><br>
</div>
<div>Hope this helps.</div>
<div><br>
</div>
<div>Best</div>
<div>Achim</div>
<div><br>
</div>
<div><br>
<div>
<div>On Jan 9, 2011, at 1:19 PM, 한세희 wrote:</div>
<br class="Apple-interchange-newline">
<blockquote type="cite">
<div class="gmail_quote">Hi all
<div><br>
</div>
<div>I have tried to get the G-value of the glazing system
in ESP-r. </div>
<div> </div>
<div>But I haven't been able to find it.</div>
<div> </div>
<div>In fact, I found the 'view g-value' of the
construction database and opened it. </div>
<div> </div>
<div>But, it showed me different values such as
emissivy, ref, o-ref, etc, not the g-value.</div>
<div> </div>
<div>Could you tell me how I can find the g-value or
calculate it based on those values mentioned above? </div>
<div> </div>
<div>Any prompt comment will be really appreciated.</div>
<div><br>
</div>
<div>Regards,</div>
<div><br>
</div>
<div>Hee<br>
</div>
<div>-- <br>
Han Sehee / Team Manager<br>
<br>
Design and Simulation for Sustainability(DASS) Solutions
Ltd.<br>
4F WooAm Building, #355-22 Seogyo-dong, Mapo-gu, Seoul,<br>
Rep. of Korea (Post Code: 121-838)<br>
<br>
T: +82 2 913 2585<br>
F: +82 2 949 2585 <br>
M: +82 10 5095 8155<br>
<br>
<a moz-do-not-send="true"
href="http://www.dasskorea.com/">www.dasskorea.com</a>
<br>
</div>
</div>
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</blockquote>
<br>
<br>
<pre class="moz-signature" cols="72">--
Dr Aizaz A Samuel
Department of Mechanical Engineering
University of Strathclyde
James Weir Building
Glasgow, UK
t: +44 141 548 5765
f: +44 141 552 5105
e: <a class="moz-txt-link-abbreviated" href="mailto:samuel@esru.strath.ac.uk">samuel@esru.strath.ac.uk</a></pre>
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