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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>John- Perhaps you should have supplied a reference for your “cold beer” in the palm of your hand solution. There was an excellent article in the new e Journal of Disruptive Science and Technology. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> <a href="http://online.liebertpub.com/loi/DST">http://online.liebertpub.com/loi/DST</a> <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>that addresses this issue. It is in the premier issue entitled </span><b><span style='font-size:8.5pt;font-family:"Verdana","sans-serif";color:#333333'>Enhancing Thermal Exchange in Humans and Practical Applications </span></b><b><span style='font-size:8.5pt;font-family:"Verdana","sans-serif";color:#333333'><img border=0 width=16 height=13 id="Picture_x0020_1" src="cid:image001.gif@01CD7BDE.02BE1420" alt="Description: free access"></span></b><span style='font-size:8.5pt;font-family:"Verdana","sans-serif";color:#333333'>H. Craig Heller, Dennis A. Grahn <b><o:p></o:p></b></span></p><p class=MsoNormal><span style='font-size:8.5pt;font-family:"Verdana","sans-serif";color:gray'>Disruptive Science and Technology. 2012, 1(1): 11-19.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.5pt;font-family:"Verdana","sans-serif";color:gray'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:8.5pt;font-family:"Verdana","sans-serif";color:gray'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>In summary it says that </span><span style='font-family:"Calibri","sans-serif";color:#1F497D'>“The intermittent application of vacuum cooling to the palms of individuals exercising in a hot environment had the effects of lowering the rate of rise of core temperature and enhancing performance”. What we need is a beer holder that applies an intermittent vacuum to the hand that holds it. Less spillage and a cooler feeling environment. <o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Don<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'> greenbuilding-bounces@lists.bioenergylists.org [mailto:greenbuilding-bounces@lists.bioenergylists.org] <b>On Behalf Of </b>John Straube<br><b>Sent:</b> Thursday, August 16, 2012 11:16 AM<br><b>To:</b> Alan Abrams<br><b>Cc:</b> Green Building<br><b>Subject:</b> Re: [Greenbuilding] Passive House Overheating<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-family:"Helvetica","sans-serif"'>Yes, you can distinguish sensible from latent (humidity) energy in the lab or carefully instrumented houses.<br>No, it is not easy to measure in normal homes, but you can if you are careful and have numerous instruments.<br><br>Systems that ventilate buildings with cool outdoor air are called "economizers" in commercial buildings. They are used on many many modern buildings. As they were being deployed it was noticed that you could not use temperature as a trigger for when to ventilate, because ventilation often brought in significant amounts of humidity which was adsorbed and stored in materials and furnishings. When the AC turned on during warmer hours, it had to work much harder to remove this stored moisture, and comfort was compromised. So they invented "enthalpy control" which only ventilates when the air outside has less energy in it, eg some combination of temperature and humidity. Dont ventilate when it is 65F and raining, do ventilate when it is 70F and 40%RH. <br><br>The folks at Florida Solar Energy Center and my colleague at BSC, Armin Rudd, have studied this effect in hot-humid climate housing and it is a really big deal. Often the energy saved by window opening during summer is almost zero.<br><br>As we get to super insulated homes, more and more of the AC energy required is to remove latent energy (control humidity). This is a topic of active and intense research as normal AC systems dont do this: their ratio of sensible to latent heat is pretty much fixed. We see lots of problem buildings with poor summer humidity control now that many new buildings have an enclosure is insulated and good window solar control is added. Many solve this with energy consuming dehumidifiers.<br><br>In my own super insulated house, I have no over heating issues at all and I try to operate the windows very carefully, but humidity becomes a problem after 3 or 4 days of warm (over 80) humid weather. I am using a dehumidifier to limit RH peaks. Next year I will be installing a variable capacity mini-split to do this more efficiently.<br><br>And, I tried the getting a cold beer as a solution, but this was not quite good enough :)</span><o:p></o:p></p><div><p class=MsoNormal>Dr John Straube, P.Eng. <br><a href="http://www.BuildingScience.com">www.BuildingScience.com</a><o:p></o:p></p></div><p class=MsoNormal>On 12-08-16 10:57 AM, Alan Abrams wrote:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal>this leads to a question...in a refrigerated system, can you effectively distinguish the energy required for reducing sensible heat from the energy to reduce latent heat? The question arose on a project I am consulting on, in which the supposedly leading edge mechanical contractor designed an AC system that uses the dank, dark, and dismal 120 yr old basement as a return plenum. <o:p></o:p></p></blockquote><p class=MsoNormal><o:p> </o:p></p></div></body></html>