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<p class="MsoNormal"><font size="2" color="navy" face="Calibri"><span style="font-size:
11.0pt;font-family:Calibri;color:navy">Hi all,
<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Calibri"><span style="font-size:
11.0pt;font-family:Calibri;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Calibri"><span style="font-size:
11.0pt;font-family:Calibri;color:navy">I’ve got a proposal for a biogas plant at our textile factory in
<st1:country-region w:st="on"><st1:place w:st="on">Sri Lanka</st1:place></st1:country-region>. I need to verify the energy per day to assess the feasibility of this project.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Calibri"><span style="font-size:
11.0pt;font-family:Calibri;color:navy">The contractors propose a 90m3 plant (comprising of 3 tanks - 60m3, 20m3 and 10m3) for a daily input of 450kg of food waste from
the canteen. <o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Calibri"><span style="font-size:
11.0pt;font-family:Calibri;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Calibri"><span style="font-size:
11.0pt;font-family:Calibri;color:navy">My question is will this plant supply enough gas to cover the present LPG consumption?<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Calibri"><span style="font-size:
11.0pt;font-family:Calibri;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
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<p class="MsoNormal"><u><font size="2" face="Calibri"><span style="font-size:11.0pt;
font-family:Calibri">Present LPG consumption in the kitchen</span></font></u><font size="2" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri">:<u><o:p></o:p></u></span></font></p>
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height:15.75pt">
<p class="MsoNormal"><font size="3" face="Calibri"><span style="font-size:12.0pt;
font-family:Calibri"><o:p> </o:p></span></font></p>
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<td width="219" nowrap="" height="21" valign="bottom" style="width:164.2pt;padding:
0in 5.4pt 0in 5.4pt;height:15.75pt">
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt;
font-family:Calibri"> cylinders per day<o:p></o:p></span></font></p>
</td>
<td width="74" nowrap="" height="21" valign="bottom" style="width:55.6pt;padding:0in 5.4pt 0in 5.4pt;
height:15.75pt" x:num="">
<p class="MsoNormal" align="right" style="text-align:right"><font size="3" face="Calibri"><span style="font-size:12.0pt;font-family:Calibri">3<o:p></o:p></span></font></p>
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<td width="74" nowrap="" height="21" valign="bottom" style="width:55.8pt;padding:0in 5.4pt 0in 5.4pt;
height:15.75pt">
<p class="MsoNormal"><font size="3" face="Calibri"><span style="font-size:12.0pt;
font-family:Calibri"><o:p> </o:p></span></font></p>
</td>
</tr>
<tr height="21" style="height:15.75pt">
<td width="219" nowrap="" height="21" valign="bottom" style="width:164.2pt;padding:
0in 5.4pt 0in 5.4pt;height:15.75pt">
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt;
font-family:Calibri">cylinders per month<o:p></o:p></span></font></p>
</td>
<td width="74" nowrap="" height="21" valign="bottom" style="width:55.6pt;padding:0in 5.4pt 0in 5.4pt;
height:15.75pt" x:num="">
<p class="MsoNormal" align="right" style="text-align:right"><font size="3" face="Calibri"><span style="font-size:12.0pt;font-family:Calibri">60<o:p></o:p></span></font></p>
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<td width="74" nowrap="" height="21" valign="bottom" style="width:55.8pt;padding:0in 5.4pt 0in 5.4pt;
height:15.75pt">
<p class="MsoNormal"><font size="3" face="Calibri"><span style="font-size:12.0pt;
font-family:Calibri"><o:p> </o:p></span></font></p>
</td>
</tr>
<tr height="21" style="height:15.75pt">
<td width="219" nowrap="" height="21" valign="bottom" style="width:164.2pt;padding:
0in 5.4pt 0in 5.4pt;height:15.75pt" x:str="Total weight of the cylinder ">
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt;
font-family:Calibri">Gas weight per cylinder
<o:p></o:p></span></font></p>
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<td width="74" nowrap="" height="21" valign="bottom" style="width:55.6pt;padding:0in 5.4pt 0in 5.4pt;
height:15.75pt" x:num="">
<p class="MsoNormal" align="right" style="text-align:right"><font size="3" face="Calibri"><span style="font-size:12.0pt;font-family:Calibri">37.5<o:p></o:p></span></font></p>
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height:15.75pt">
<p class="MsoNormal"><font size="3" face="Calibri"><span style="font-size:12.0pt;
font-family:Calibri">kg<o:p></o:p></span></font></p>
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<td width="219" nowrap="" height="21" valign="bottom" style="width:164.2pt;padding:
0in 5.4pt 0in 5.4pt;height:15.75pt" x:str="Gas weight per cylinder ">
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt;
font-family:Calibri">Energy requirement per day
<o:p></o:p></span></font></p>
</td>
<td width="74" nowrap="" height="21" valign="bottom" style="width:55.6pt;padding:0in 5.4pt 0in 5.4pt;
height:15.75pt" x:num="4950" x:fmla="=B5*44*3">
<p class="MsoNormal" align="right" style="text-align:right"><b><font size="3" face="Calibri"><span style="font-size:12.0pt;font-family:Calibri;font-weight:
bold">4,950<o:p></o:p></span></font></b></p>
</td>
<td width="74" nowrap="" height="21" valign="bottom" style="width:55.8pt;padding:0in 5.4pt 0in 5.4pt;
height:15.75pt">
<p class="MsoNormal"><b><font size="3" face="Calibri"><span style="font-size:12.0pt;
font-family:Calibri;font-weight:bold">MJ/kg<o:p></o:p></span></font></b></p>
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<tr height="21" style="height:15.75pt">
<td width="219" nowrap="" height="21" valign="bottom" style="width:164.2pt;padding:
0in 5.4pt 0in 5.4pt;height:15.75pt" x:str="Energy requirement per day ">
<p class="MsoNormal"><font size="2" face="Calibri"><span style="font-size:11.0pt;
font-family:Calibri"><o:p> </o:p></span></font></p>
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<td width="74" nowrap="" height="21" valign="bottom" style="width:55.6pt;padding:0in 5.4pt 0in 5.4pt;
height:15.75pt">
<p class="MsoNormal"><font size="3" face="Calibri"><span style="font-size:12.0pt;
font-family:Calibri"><o:p> </o:p></span></font></p>
</td>
<td width="74" nowrap="" height="21" valign="bottom" style="width:55.8pt;padding:0in 5.4pt 0in 5.4pt;
height:15.75pt">
<p class="MsoNormal"><font size="3" face="Calibri"><span style="font-size:12.0pt;
font-family:Calibri"><o:p> </o:p></span></font></p>
</td>
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0in 5.4pt 0in 5.4pt;height:15.75pt">
<p class="MsoNormal"><font size="3" face="Calibri"><span style="font-size:12.0pt;
font-family:Calibri">food waste<o:p></o:p></span></font></p>
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<td width="74" nowrap="" height="21" valign="bottom" style="width:55.6pt;padding:0in 5.4pt 0in 5.4pt;
height:15.75pt" x:num="">
<p class="MsoNormal" align="right" style="text-align:right"><font size="3" face="Calibri"><span style="font-size:12.0pt;font-family:Calibri">450<o:p></o:p></span></font></p>
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height:15.75pt">
<p class="MsoNormal"><font size="3" face="Calibri"><span style="font-size:12.0pt;
font-family:Calibri">kg/day<o:p></o:p></span></font></p>
</td>
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<tr height="21" style="height:15.75pt">
<td width="219" nowrap="" height="21" valign="bottom" style="width:164.2pt;padding:
0in 5.4pt 0in 5.4pt;height:15.75pt">
<p class="MsoNormal"><font size="3" face="Calibri"><span style="font-size:12.0pt;
font-family:Calibri"><o:p> </o:p></span></font></p>
</td>
<td width="74" nowrap="" height="21" valign="bottom" style="width:55.6pt;padding:0in 5.4pt 0in 5.4pt;
height:15.75pt" x:num="">
<p class="MsoNormal" align="right" style="text-align:right"><font size="3" face="Calibri"><span style="font-size:12.0pt;font-family:Calibri"><o:p> </o:p></span></font></p>
</td>
<td width="74" nowrap="" height="21" valign="bottom" style="width:55.8pt;padding:0in 5.4pt 0in 5.4pt;
height:15.75pt">
<p class="MsoNormal"><font size="3" face="Calibri"><span style="font-size:12.0pt;
font-family:Calibri"><o:p> </o:p></span></font></p>
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<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Calibri"><span style="font-size:
11.0pt;font-family:Calibri;color:navy">Assuming a food:biogas of 1:1, 450m3 of biogas will be produced per day. Of which 60% is CH4 hence, energy obtained =
<b><span style="font-weight:bold">13,500MJ/day</span></b> (calorific value of CH4 taken as 50.09MJ/m3)<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Calibri"><span style="font-size:
11.0pt;font-family:Calibri;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Calibri"><span style="font-size:
11.0pt;font-family:Calibri;color:navy">However, calculating the energy obtained using the equation below and taking 15% of the food waste as Carbon content</span></font><font size="2" color="black" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;
color:black">,
<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="black" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:black">Coe/Co = 0.014T + 0.28<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="black" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:black"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Calibri"><span style="font-size:
11.0pt;font-family:Calibri;color:navy">Gives the energy per day as
<b><span style="font-weight:bold">3,763MJ/day</span></b><o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Calibri"><span style="font-size:
11.0pt;font-family:Calibri;color:navy">Which of these values am I to trust?
<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Calibri"><span style="font-size:
11.0pt;font-family:Calibri;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Calibri"><span style="font-size:
11.0pt;font-family:Calibri;color:navy">Thanks and regards<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Calibri"><span style="font-size:
11.0pt;font-family:Calibri;color:navy">Kshanika Goonesekera<o:p></o:p></span></font></p>
<p class="MsoNormal"><st1:country-region w:st="on"><st1:place w:st="on"><font size="2" color="navy" face="Calibri"><span style="font-size:11.0pt;font-family:
Calibri;color:navy">Sri Lanka</span></font></st1:place></st1:country-region><font size="2" color="navy" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;
color:navy"><o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="black" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:black"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
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