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Chris,<BR> <BR>> Q1: I'm used to citing CIBSE as my preferred source of internal gains <BR>> info. However, the information is now a little dated and doesn't even <BR>> cover TFT screens. Is ASHRAE any better in this department? If not, is <BR>> there any reliable source that I can cite for modern desktops, laptops <BR>> and TFT screens?<BR><BR>I'm replying with immediate access to the 2001 ASHRAE Fundamentals only - the current version is 2005 (so the information might also be slightly outdated).<BR> <BR>Chapter 29 (<FONT face=TT3CEo00><FONT face=TT3CEo00>Nonresidential Cooling and Heating Load Calculation Procedures) [Chapter 30 in the 2005 version] cites studies from 1994 and 1999 for typical computer loads (Table 8 for typical computer equipment).</FONT></FONT><BR> <BR>I have found this study from 2002 more useful:<BR> <BR><A href="http://repositories.cdlib.org/cgi/viewcontent.cgi?article=1567&context=lbnl">http://repositories.cdlib.org/cgi/viewcontent.cgi?article=1567&context=lbnl</A><BR> <BR>It offers interesting comarisons between CRT versus LCD screens, monitor consumption as a function of display colors, PC activity, operating systems, etc. It is however based on data measured 6/7 years ago ...<BR> <BR>EnergyStar offers a calculator which could be of interest:<BR> <BR><A href="http://www.energystar.gov/ia/business/bulk_purchasing/bpsavings_calc/Calc_monitors.xls">http://www.energystar.gov/ia/business/bulk_purchasing/bpsavings_calc/Calc_monitors.xls</A><BR> <BR>These studies/tools are indeed useful (does anyone know of more recent studies ...?), but the data they're based on is likely outdated in many areas. If you're seriously interested in getting a detailed assessment, I wouldn't hesitate in purchasing a power analyzer/line meter ... Good knowledge of occupant mobility is also critical (field studies have shown that office workers can be absent from the offices/workstations between 25% and 50% of the time ... information not readily available).<BR> <BR>Finally, you should also check the ASHRAE RP 1093 project literature (e.g. <A href="http://repositories.tamu.edu/browse?value=Abushakra,+B.&type=author">http://repositories.tamu.edu/browse?value=Abushakra%2C+B.&type=author</A>)<BR><BR>> Q2: As temperature increases the human body gives off less `sensible <BR>> heat' and more latent heat. Can anybody cite any data regarding this <BR>> phenomenon? Again, there used to be a table in CIBSE guide A (1999) but <BR>> it was withdrawn in later versions.<BR> <BR>Table 1 in Chapter 29 of the ASHRAE Fundamentals (<FONT face=TT3CEo00><FONT face=TT3CEo00>Nonresidential Cooling and Heating Load Calculation Procedures) contains sensible (radiant versus convective) versus latent heat (high versus low air velocity) for adult males and an 'adjusted' male/female/children distribution. That's a quick fix - that's a field in itself.</FONT></FONT><BR><FONT face=TT3CEo00><FONT face=TT3CEo00></FONT></FONT> <BR><FONT face=TT3CEo00><FONT face=TT3CEo00>Hope this helps,</FONT></FONT><BR><FONT face=TT3CEo00><FONT face=TT3CEo00>Denis Bourgeois<BR></FONT></FONT><BR>> Chris<BR>> _______________________________________________<BR>> Bldg-sim mailing list<BR>> http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org<BR>> To unsubscribe from this mailing list send a blank message to BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG<BR><BR><br /><hr /> <a href='' target='_new'></a></body>
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