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Heat buildup in sealed boxes
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<blockquote data-quote="Peter Morris" data-source="post: 133587" data-attributes="member: 652"><p>Re: Heat buildup in sealed boxes</p><p></p><p></p><p></p><p><span style="font-family: 'Arial'"><span style="font-size: 12px"><span style="color: #000000">You need to think in terms of energy.</span></span></span></p><p> <span style="font-family: 'Arial'"><span style="font-size: 12px"><span style="color: #000000"></span></span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 12px"><span style="color: #000000">How hot does the inside of the box need to be compared to the outside before it can transfer energy at the rate equal to the amount being dissipated by the voice-coil. The greater the difference the great the transfer rate.</span></span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 12px"><span style="color: #000000"></span></span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 12px"><span style="color: #000000">I would assume almost all of the energy you put in to the driver turns to heat. Music’s average to peak ratio means about 125 to 250 watts of heat for a 1000W driver at full power.</span></span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 12px"><span style="color: #000000"></span></span></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 12px"><span style="color: #000000">Here are some very simple examples of the type of calculations needed. </span></span></span></p><p><span style="font-family: 'Arial'"><a href="http://formulas.tutorvista.com/physics/heat-transfer-formula.html" target="_blank"><span style="font-size: 12px"><span style="color: #0000ff">http://formulas.tutorvista.com/physics/heat-transfer-formula.html</span></span></a></span></p><p><span style="font-family: 'Arial'"></span></p><p><span style="font-family: 'Arial'"><span style="font-size: 12px"><span style="color: #000000">The k for wood is about 0.15 W/mK and paper (the speaker cone) 0.05 W/mK ... but it varies.</span></span></span></p><p></p><p><span style="font-family: 'Arial'"><a href="http://www.engineeringtoolbox.com/thermal-conductivity-d_429.html" target="_blank"><span style="font-size: 12px"><span style="color: #0000ff">http://www.engineeringtoolbox.com/thermal-conductivity-d_429.html</span></span></a></span></p><p></p><p><span style="font-family: 'Arial'"><span style="font-size: 12px"><span style="color: #000000">For more accurate calculations you need this type of approach - </span></span></span></p><p></p><p><span style="font-family: 'Arial'"><a href="http://windows.lbl.gov/software/therm/therm.html" target="_blank"><span style="font-size: 12px"><span style="color: #0000ff">http://windows.lbl.gov/software/therm/therm.html</span></span></a></span></p></blockquote><p></p>
[QUOTE="Peter Morris, post: 133587, member: 652"] Re: Heat buildup in sealed boxes [FONT=Arial][SIZE=3][COLOR=#000000]You need to think in terms of energy. [/COLOR][/SIZE][/FONT] [FONT=Arial][SIZE=3][COLOR=#000000]How hot does the inside of the box need to be compared to the outside before it can transfer energy at the rate equal to the amount being dissipated by the voice-coil. The greater the difference the great the transfer rate. [/COLOR][/SIZE][/FONT] [FONT=Arial][SIZE=3][COLOR=#000000]I would assume almost all of the energy you put in to the driver turns to heat. Music’s average to peak ratio means about 125 to 250 watts of heat for a 1000W driver at full power. [/COLOR][/SIZE][/FONT] [FONT=Arial][SIZE=3][COLOR=#000000]Here are some very simple examples of the type of calculations needed. [/COLOR][/SIZE][/FONT] [FONT=Arial][URL="http://formulas.tutorvista.com/physics/heat-transfer-formula.html"][SIZE=3][COLOR=#0000ff]http://formulas.tutorvista.com/physics/heat-transfer-formula.html[/COLOR][/SIZE][/URL] [/FONT] [FONT=Arial][SIZE=3][COLOR=#000000]The k for wood is about 0.15 W/mK and paper (the speaker cone) 0.05 W/mK ... but it varies.[/COLOR][/SIZE][/FONT] [FONT=Arial][URL="http://www.engineeringtoolbox.com/thermal-conductivity-d_429.html"][SIZE=3][COLOR=#0000ff]http://www.engineeringtoolbox.com/thermal-conductivity-d_429.html[/COLOR][/SIZE][/URL][/FONT] [FONT=Arial][SIZE=3][COLOR=#000000]For more accurate calculations you need this type of approach - [/COLOR][/SIZE][/FONT] [FONT=Arial][URL="http://windows.lbl.gov/software/therm/therm.html"][SIZE=3][COLOR=#0000ff]http://windows.lbl.gov/software/therm/therm.html[/COLOR][/SIZE][/URL][/FONT] [/QUOTE]
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