<div dir="ltr"><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><span style="color:rgb(0,0,255)">Hi Peter,<br><br></span></div><span style="color:rgb(0,0,255)">Thermal mass is the ability of the wall or roof to store thermal energy.<br>.................................................................................................................<br><br></span></div><div><span style="color:rgb(0,0,255)">Let us have a review of few equations:<br></span></div><div><span style="color:rgb(0,0,255)"><br></span></div><span style="color:rgb(0,0,255)">1. The equation for thermal mass is:<br> Thermal mass= mass of the wall * specific heat capacity of wall .<span style="color:rgb(255,0,0)"><i>(equation-1)</i></span><br><br></span></div><span style="color:rgb(0,0,255)">2. It can be further deduced to:<br> Thermal mass= thickness * area of wall * density of wall * specific heat capacity of wall .<i><span style="color:rgb(255,0,0)"> (equation-2)</span></i><br></span><br><span style="color:rgb(0,0,255)"><span style="color:rgb(0,0,255)">3.</span><span style="color:rgb(0,0,255)"> Stored energy in wall = Thermal mass * delta T (change in wall temp)<br></span></span><br><font size="2"><span style="color:rgb(0,0,255)"><span style="color:rgb(0,0,255)">4. R value is the reverse of conductance.<br></span></span></font></div><span style="color:rgb(0,0,255)"><br></span></div><span style="color:rgb(0,0,255)">5. The heat transfer is dependent upon the major formula<br> Heat transfer (Q) = Conductance (1/R) * Area of w<font size="2">all * delta T.(temp diff between outside and room temp) </font><i><span style="color:rgb(255,0,0)"><font size="2">(equation-3</font>)</span><br></i></span><br><span style="color:rgb(0,0,255)"><i><span style="color:rgb(0,0,255)"></span></i>..................................................................................................................<br></span></div><div><span style="color:rgb(0,0,255)"><br>Thermal mass is responsible for the thermal energy stored and temperature rise of walls or opaque surfaces.<br>Hence the major criteria to be supposed for major dependency of heating loads or demands is R value or U value as the stored energy due to the thermal storage is not that huge to make a feel on demands or loads.<br></span></div><br></div><span style="color:rgb(0,0,255)">One will have to do a drastic change in any of the factor like changing thickness, density or specific heat of opaque surfaces to have some effect</span>.<br>..................................................................................................................<br></div><span style="color:rgb(0,0,255)">To see the effect of thermal mass let us suppose two cases:<br><br></span></div><span style="color:rgb(0,0,255)">1. High specific heat: Then the stored energy will be huge but the heat transfer after that will be less.The time taken will be large<br>.<br></span></div><span style="color:rgb(0,0,255)">2. Low specific heat: Then stored energy will be less and the amount of heat transfer is less in quick span of time.<br><br></span></div><span style="color:rgb(0,0,255)">So rounding off these two cases results in less heat transfer per unit time due to thermal storage.<br>This is an indirect way of heat transfer as compared to R value method as R value method is applied for every second.<br><br></span></div><span style="color:rgb(0,0,255)">Hope this can be helpful .For your case you will have to be sensitive about the actual inputs and thermal conditions.<br><br><br></span></div><span style="color:rgb(0,0,255)">Thanks,<br></span></div><span style="color:rgb(0,0,255)">Sharad.Kumar.<br></span></div><span style="color:rgb(0,0,255)">Green Horizon Consulting LLP<br></span></div><span style="color:rgb(0,0,255)">Gurgon<br></span></div><span style="color:rgb(0,0,255)">India.</span><br><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div class="gmail_extra"><a href="https://www.linkedin.com/profile/view?id=151208255&trk=nav_responsive_tab_profile" target="_blank">Linked-in</a><br><div class="gmail_quote"><br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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