The long and the short of it is even at 90F the correction is only .004 which isn't nothing but isn't huge, it will throw the ABW off by .5%. I don't run the ferment quite that hot. I pitch at 85F, then let it cool to 82F for 2 days and then lower it to 78F for 2 days and finish at 72F. I control it with an aquarium heater. Going from 85F to 72F is around a .25% change.
DoN
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<html>
<head>
<title>Alcohol Content of Sugar Wash with Temp Correction</title>
<!-- modified/written by Distillate of Nerd and posted to the homedistiller.org forum.-->
<!-- as far as I am concerned anyone can reuse, rewrite, repurpose or host without my permission.-->
<!-- This page was hacked together from a unattributed script found here: http://merrycuss.com/calc/sgcorrection.html-->
<!-- If the original author complains please comply with his wishes. No offense was intended by its modification.-->
<script type="text/javascript">
// function for dealing with Celsius
function conversionc() {
//Sets variables; data from form named "abwtempcor"
var sg1=document.abwtempcor.StartSG.value;
var temp1=document.abwtempcor.StartTemp.value;
var sg2=document.abwtempcor.FinalSG.value;
var temp2=document.abwtempcor.FinalTemp.value;
//Convert sg to a floating point number
var sg1=parseFloat(sg1);
var sg2=parseFloat(sg2);
//Convert celsisus values to fahrenheit
var temp1=(9/5)*temp1+32;
var temp2=(9/5)*temp2+32;
//Calculates SG correction for 59F from HBD http://hbd.org/brewery/library/HydromCorr0992.html
var correction1=1.313454-(0.132674*temp1)+(0.002057793*temp1*temp1)-(0.000002627634*temp1*temp1*temp1);
var correction2=1.313454-(0.132674*temp2)+(0.002057793*temp2*temp2)-(0.000002627634*temp2*temp2*temp2);
//Round off correction values and convert to SG scale
var correction1=(Math.round(correction1))/1000;
var correction2=(Math.round(correction2))/1000;
//Adds SG correction to the measured SG
adjustedgravity1=correction1+sg1;
adjustedgravity2=correction2+sg2;
//Round off adjustedgravity
var adjustedgravity1=Math.round(adjustedgravity1 * 1000)/1000;
var adjustedgravity2=Math.round(adjustedgravity2 * 1000)/1000;
//Percent Alcohol Content by Weight
var abw=(adjustedgravity1-adjustedgravity2)*129;
//Round off ABW
var abw=Math.round(abw * 1000)/1000;
//sends the calculations back to a form named "abwtempcor"
document.abwtempcor.resultsStartCor.value=correction1;
document.abwtempcor.resultsStartAG.value=adjustedgravity1;
document.abwtempcor.resultsFinalCor.value=correction2;
document.abwtempcor.resultsFinalAG.value=adjustedgravity2;
document.abwtempcor.abw.value=abw;
document.abwtempcor.scale.value="Caculated in Celsius";
}
//function for dealing with Fahrenheit
function conversionf() {
//Sets variables; data from form named "abwtempcor"
var sg1=document.abwtempcor.StartSG.value;
var temp1=document.abwtempcor.StartTemp.value;
var sg2=document.abwtempcor.FinalSG.value;
var temp2=document.abwtempcor.FinalTemp.value;
//Convert sg to a floating point number
var sg1=parseFloat(sg1);
var sg2=parseFloat(sg2);
//Calculates SG correction for 59F from HBD http://hbd.org/brewery/library/HydromCorr0992.html
var correction1=1.313454-(0.132674*temp1)+(0.002057793*temp1*temp1)-(0.000002627634*temp1*temp1*temp1);
var correction2=1.313454-(0.132674*temp2)+(0.002057793*temp2*temp2)-(0.000002627634*temp2*temp2*temp2);
//Round off correction values and convert to SG scale
var correction1=(Math.round(correction1))/1000;
var correction2=(Math.round(correction2))/1000;
//Adds SG correction to the measured SG
adjustedgravity1=correction1+sg1;
adjustedgravity2=correction2+sg2;
//Round off adjustedgravity
var adjustedgravity1=Math.round(adjustedgravity1 * 1000)/1000;
var adjustedgravity2=Math.round(adjustedgravity2 * 1000)/1000;
//Percent Alcohol Content by Weight
var abw=(adjustedgravity1-adjustedgravity2)*129;
//Round off ABW
var abw=Math.round(abw * 1000)/1000;
//sends the calculations back to a form named "abwtempcor"
document.abwtempcor.resultsStartCor.value=correction1;
document.abwtempcor.resultsStartAG.value=adjustedgravity1;
document.abwtempcor.resultsFinalCor.value=correction2;
document.abwtempcor.resultsFinalAG.value=adjustedgravity2;
document.abwtempcor.abw.value=abw;
document.abwtempcor.scale.value="Caculated in Fahrenheit";
}
</script>
</head>
<body>
<h2>Alcohol Content of Sugar Wash with Temp Correction</h2>
<form name="abwtempcor">
<table Border=1 width=480>
<tr>
<td>
<input type="text" size="5" maxlength="3" value=60 name="StartTemp"> Starting Temp
</td>
<td>
Temperature correction: <input type="text" size="5" id="resultsStartCor" value="0" readonly>
</td>
</tr>
<tr>
<td>
<input type="text" size="5" maxlength="5" value=1.050 name="StartSG"> Measured Starting SG
</td>
<td>
Corrected SG: <input type="text" size="5" id="resultsStartAG" value="1.050" readonly>
</td>
</tr>
<tr>
</tr>
<tr>
<td>
<input type="text" size="5" maxlength="3" value=60 name="FinalTemp"> Final Temp
</td>
<td>
Temperature correction: <input type="text" size="5" id="resultsFinalCor" value="0" readonly>
</td>
</tr>
<tr>
<td>
<input type="text" size="5" maxlength="5" value=1.050 name="FinalSG"> Measured Final SG
</td>
<td>
Corrected SG: <input type="text" size="5" id="resultsFinalAG" value="1.050" readonly>
</td>
</tr>
<tr>
<td>
Percent Alcohol in Wash: <input type="text" size="4" id="abw" value="0" readonly>%
</td>
<td>
<input type="text" size="25" id="scale" value="0" readonly>
</td>
<tr>
</table>
Click to Calculate: <input type="button" value="Fahrenheit" onclick="conversionf()" /> <input type="button" value="Celsius" onclick="conversionc()"
</form>
</body>
</html>