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</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>Dear Frank<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Humidity is just a way of expressing the moisture content of the air. Instead of expressing it in % (of what it <i>could</i> hold without condensing at that temperature and pressure) one could express it as the mass of water per cubic metre of air at that temperature and pressure. For example you could say 14 g of water vapour per m<sup>3</sup>. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Cooling that air causes the moisture to release its latent heat, warming the air (opposing the cooling) causing it to cool more slowly. If the humidity is really low, air will drop in temperature very rapidly at night.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>You could calculate (in absolute terms) the quantum of energy in any particular cubic metre of air if you know the temperature, pressure and mass of water vapour in it.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Regards<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Crispin<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0mm 0mm 0mm'><p class=MsoNormal><span style='color:#1F497D'>+++++++</span><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'><o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-US>Dear Stovers,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>A few questions if you don’t mind. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Enthalpy of water is 104.73 kj/kg at 25 deg. C<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>We need to add 4.186 kj/kg/deg. C (4.186 X 75) 314 to equal 419 to reach 100 deg. C<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>We need to add (2675 – 419) =2256 kj/kg to get to a vapor. And have enthalpy of 2675 kj/kg at 100 deg. C. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>But then the water vapor goes up to 400 deg. C in a stack. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>So we add 1.72 kj/kg / deg. C or 300 X 1.72 = 516. So 516 + 2675 = 3191 kj/kg in the water vapor at 400 deg C. (?)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>When the vapor cools off it releases a lot of energy. Its interesting to me that water vapor at 25 deg. C has so much more energy than water in a liquid! <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>How does humidity calculate into all this? <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Thanks<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Frank<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Frank Shields<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>42 Hangar Way<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Watsonville, CA 95076<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>(831) 724-5244 tel<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>(831) 724-3188 fax<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><a href="mailto:frank@bioCharlab.com">frank@bioCharlab.com</a><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></body></html>