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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-GB link=blue vlink=purple><div class=WordSection1><p><span style='color:windowtext'>Hey, Guys<o:p></o:p></span></p><p><span style='color:windowtext'>Using the term ‘book smart’ is a bit tough isn’t it? Mike Marr was only trying to explain a known principle of thermodynamics to others who may not be as intimately aware of the subject as he clearly is. I fully understood the point he was making and I think it was generous of him to explain the facts as he did. If he missed out on one (or more) specific issues in the process, so be it. To my mind, using the term ‘book smart’ was hardly courteous when two other words in English, such as “thank you” or something similar, might not have been misplaced? Perhaps Mike is due an apology from whoever offered the comment?<o:p></o:p></span></p><p><span style='color:windowtext'>Jonmac<o:p></o:p></span></p><p><span style='color:windowtext'><o:p> </o:p></span></p><p><span style='color:windowtext'><</span>...wasn't going to bother arguing a 'book smart' comment until i saw your response.<br>his own statement contradicted itself .....<span style='font-size:11.0pt'><o:p></o:p></span></p><p>" The flow rate of the fluid through the heat exchanger does not affect how much heat is transferred. What is affected is the temperature change to the fluid."<o:p></o:p></p><p>TIME is point missed . It takes time for the temp to drop...that IS heat exchange.<span style='color:windowtext'>></span><o:p></o:p></p><p><o:p> </o:p></p><div><p class=MsoNormal>Paul Tegler <a href="mailto:ptegler@verizon.net">ptegler@verizon.net</a> <a href="http://www.teglerizer.com">www.teglerizer.com</a><o:p></o:p></p></div><div><p class=MsoNormal>On 5/11/2017 12:52 AM, Randall wrote:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoPlainText>> The<o:p></o:p></p><p class=MsoPlainText>> flow rate of the fluid through the heat exchanger does not affect how much<o:p></o:p></p><p class=MsoPlainText>> heat is transferred.<o:p></o:p></p><p class=MsoPlainText> <o:p></o:p></p><p class=MsoPlainText>I disagree. As the fluid cools during it's trip through the exchanger, the delta-T across the exchanger drops, causing less heat to be transferred. So the slower the flow, the more delta-T drops and less heat is transferred. In the extreme case of no flow at all, the fluid temperature drops until delta-T is zero and no further heat is transferred. If this were not true, the thermostat could not regulate engine temperature.<o:p></o:p></p><p class=MsoPlainText> <o:p></o:p></p><p class=MsoPlainText>But of course, that says that faster flow can only increase heat transfer (up to a point), not reduce it. However, there is another problem that can arise, and IMO is the root of the old myth about coolant flowing "too fast".<o:p></o:p></p><p class=MsoPlainText> <o:p></o:p></p><p class=MsoPlainText>The radiator presents a significant restriction to coolant flow, meaning there is a pressure differential across it when coolant is flowing. To increase the flow requires more pressure. But the pressure cap is on the high side of the radiator (and is only 4 psi on the earlier TRs). So, if the pressure drop across the radiator (aka head) becomes high enough, the pressure cap will open and release coolant from the system. Obviously, lack of coolant results in overheating, but the coolant loss came first. FWIW, this problem is mentioned at the bottom of <a href="http://stewartcomponents.com/index.php?route=information/information&information_id=11">http://stewartcomponents.com/index.php?route=information/information&information_id=11</a><o:p></o:p></p><p class=MsoPlainText> <o:p></o:p></p><p class=MsoPlainText>A related problem can happen even without coolant loss; namely the low side pressure goes enough below atmospheric to collapse the return hose (or hoses for TR2-4A). I used to own an Oldsmobile V8 that suffered that problem; which GM had solved by putting a reinforcing spring inside the lower hose. If you had the wrong hose fitted (ie a generic replacement instead of the GM specified hose), you could actually see it collapse just by buzzing the engine to redline.<o:p></o:p></p><p class=MsoPlainText> <o:p></o:p></p><p class=MsoPlainText>Yet another issue with the early TR motor is the original aneroid type thermostat. It relies on a heated gas expanding a bellows to open the thermostat valve. But, the bellows is also exposed to pressure from the water pump, which tends to force it closed.<o:p></o:p></p><p class=MsoPlainText> <o:p></o:p></p><p class=MsoPlainText>-- Randall<o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'><br><br><br><o:p></o:p></span></p><pre><o:p> </o:p></pre><pre>** <a href="mailto:triumphs@autox.team.net">triumphs@autox.team.net</a> **<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>Donate: <a href="http://www.team.net/donate.html">http://www.team.net/donate.html</a><o:p></o:p></pre><pre>Archive: <a href="http://www.team.net/archive">http://www.team.net/archive</a><o:p></o:p></pre><pre>Forums: <a href="http://www.team.net/forums">http://www.team.net/forums</a><o:p></o:p></pre><pre>Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/triumphs/ptegler@verizon.net">http://autox.team.net/mailman/options/triumphs/ptegler@verizon.net</a><o:p></o:p></pre></blockquote><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p></div><div id="DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br />
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