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Boiler.html
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<p class="cs95E872D0"><span class="cs84FBA952">Boiler</span></p><p class="cs95E872D0"><span class="csB33285EC">13 February, 2019</span></p><p class="cs95E872D0"><span class="csB33285EC">0:19</span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="csA27DA275">Samenvatting</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Omdat we ons totale gasverbruik in beeld willen krijgen, om enerzijds te kunnen vergelijken met het echte verbruik en anderzijds om te onderzoeken waar besparingen te behalen vallen. </span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Omdat we in eerste instantie nogal schrokken van verbruik, dat ook nog eens helemaal niet rijmde met gegevens van weliswaar een andere fabrikant, hebben we via een aantal methoden de waarden met elkaar vergeleken. Er is geen goede verklaring gevonden voor de verschillende meetresultaten.</span></p><p class="cs14438CD8"><span class="csDE344198">Momenteel houden we aan dat het op temperatuur houden van de boiler 900 kWh = 90 m3 gas op jaarbasis bedraagt.</span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Water_Warmte_Capaciteit = 1.16E-3 # kWh / ( Celsius * liter )</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Aantal opwarmingen per dag bedraagt 3..4, dus gemiddeld 3.5 ( s'nachts wordt de boiler uitgeschakeld )</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Dus op jaar basis is het aantal opwarmingen 3.5 * 365 = 1278</span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Als we verschillende meetmethoden met elkaar vergelijken, komen we tot de volgende tabel,</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Hierbij moet opgemerkt worden dat het max van methode 3 en 4 op exact hetzelfde moment gemeten zijn.</span></p><table class="cs2D2816FE" border="0" cellspacing="0" cellpadding="0" style="border-collapse:collapse;">
<tr>
<td class="cs3AA23EF7" valign="top" width="171"><p class="cs95E872D0"><span class="cs5BEC2C28">Methode</span></p></td><td class="csA3BF2834" valign="top" width="171"><p class="cs95E872D0"><span class="cs5BEC2C28">Min/Opwarming [Wh]</span></p></td><td class="cs191F803D" valign="top" width="173"><p class="cs95E872D0"><span class="cs5BEC2C28">Max/Opwarming [Wh]</span></p></td><td class="cs880B7A84" valign="top" width="125"><p class="cs95E872D0"><span class="cs5BEC2C28">Min/Jaar [kWh]</span></p></td><td class="cs7CBBC6F1" valign="top" width="129"><p class="cs95E872D0"><span class="cs5BEC2C28">Max/Jaar [kWh]</span></p></td></tr>
<tr>
<td class="cs3AA23EF7" valign="top" width="171"><p class="cs95E872D0"><span class="cs1B16EEB5">1=percentueel vermogen</span></p></td><td class="csA3BF2834" valign="top" width="171"><p class="cs95E872D0"><span class="cs1B16EEB5">500</span></p></td><td class="cs191F803D" valign="top" width="173"><p class="cs95E872D0"><span class="cs1B16EEB5">700</span></p></td><td class="cs880B7A84" valign="top" width="125"><p class="cs95E872D0"><span class="cs1B16EEB5">639</span></p></td><td class="cs7CBBC6F1" valign="top" width="129"><p class="cs95E872D0"><span class="cs1B16EEB5">895</span></p></td></tr>
<tr>
<td class="cs3AA23EF7" valign="top" width="171"><p class="cs95E872D0"><span class="cs1B16EEB5">2=theoretisch</span></p></td><td class="csA3BF2834" valign="top" width="171"><p class="cs95E872D0"><span class="cs1B16EEB5">211</span></p></td><td class="cs191F803D" valign="top" width="173"><p class="cs95E872D0"><span class="cs1B16EEB5">211</span></p></td><td class="cs880B7A84" valign="top" width="125"><p class="cs95E872D0"><span class="cs1B16EEB5">231</span></p></td><td class="cs7CBBC6F1" valign="top" width="129"><p class="cs95E872D0"><span class="cs1B16EEB5">308</span></p></td></tr>
<tr>
<td class="cs3AA23EF7" valign="top" width="171"><p class="cs95E872D0"><span class="cs1B16EEB5">3=ketelvermogen</span></p></td><td class="csA3BF2834" valign="top" width="171"><p class="cs95E872D0"><span class="cs1B16EEB5">580</span></p></td><td class="cs191F803D" valign="top" width="173"><p class="cs95E872D0"><span class="cs1B16EEB5">840</span></p></td><td class="cs880B7A84" valign="top" width="125"><p class="cs95E872D0"><span class="cs1B16EEB5">740</span></p></td><td class="cs7CBBC6F1" valign="top" width="129"><p class="cs95E872D0"><span class="cs1B16EEB5">1077</span></p></td></tr>
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<td class="cs3AA23EF7" valign="top" width="171"><p class="cs95E872D0"><span class="cs1B16EEB5">4=gasverbruik</span></p></td><td class="csA3BF2834" valign="top" width="171"><p class="cs95E872D0"><span class="cs1B16EEB5"> </span></p></td><td class="cs191F803D" valign="top" width="173"><p class="cs95E872D0"><span class="cs1B16EEB5">842</span></p></td><td class="cs880B7A84" valign="top" width="125"><p class="cs95E872D0"><span class="cs1B16EEB5"> </span></p></td><td class="cs7CBBC6F1" valign="top" width="129"><p class="cs95E872D0"><span class="cs1B16EEB5">1077</span></p></td></tr>
</table>
<p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Methode 4 maakt gebruik van een zeer goed gekalibreerde meter, namelijk de standaard gasmeter in de meterkast.</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">En helaas deze methode 4 geeft zelfs aan dat we verbruik in onze eerste metingen zelfs onderschat hebben.</span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Hoe dit te verklaren:</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">In methode-2 (theoretisch), hebben we enkel het opwarmen van het water gerekend en niet de opwarming van het vat en de warmtewisselaar. Als we ons realiseren dat de warmte capaciteit van water ruwweg een factor 10 groter is dan van metaal en bovendien het gewicht van het water ook nog eens een factor 10 hoger is, is het duidelijk dat de afwijking in de orde van 1% is. Dit is dus niet de verklaring.</span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Het rendement van de ketel is mogelijk een heel stuk slechter bij dit soort korte piekbelastingen.</span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5">De Ketel produceert te veel warmte voor het boilervat en pompt de overblijvende energie in het cv systeem.</span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span><img src="Boiler_files/image0.png" width="931" height="556" alt="" style="border-width:0px;" /></span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> Dit moeten we nog eens een keer goed meten als de verwarming uitstaat.</span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="csA27DA275">Methode 1</span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Bereken de energie van een opwarming op basis van percentueel ketelvermogen.</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">In onderstaande figuur zien we om 10:41 een boiler opwarming.</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Het gemiddeld vermogen bedraagt hier ongeveer 50% (ketel heeft een max vermogen van 24 kW).</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">De duur van het stoken bedraagt 3 minuten, dus in werkelijkheid ligt de tijd tussen 2.5 en 3.5 minuten.</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Het energie bedraagt dus:</span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="csDC4A80">Minimaal:</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">0.5 * 24000 * 2.5 / 60 = 500 Wh</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Dus per jaar 1278 * 500 / 1000 = 639 kWh</span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="csDC4A80">Maximaal:</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">0.5 * 24000 * 3.5 / 60 = 700 Wh</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Dus per jaar 1278 * 700 / 1000 = 895 kWh</span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span><img src="Boiler_files/image1.png" width="837" height="398" alt="" style="border-width:0px;" /></span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs5FC355D3">Screen clipping taken: 13-Feb-19, 12:12</span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="csA27DA275">Methode 2</span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Uit onderstaand plaatje blijkt dat de boiler 3 to 4 keer per dag wordt opgestookt (groene curve is de Boiler Temperatuur).</span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span><img src="Boiler_files/image2.png" width="963" height="568" alt="" style="border-width:0px;" /></span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Als we inzoomen, kunnen we zien dat het boilervat wordt verwrmd van 60 graden Celsius naar 73 graden Celsius, dus een delta-T van 13 graden Celsius. </span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span><img src="Boiler_files/image3.png" width="963" height="565" alt="" style="border-width:0px;" /></span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Het boilervat heeft een inhoud van 14 liter.</span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Energie per jaar volgens deze gegevens is dus</span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> Aantal Opwarmingen per dag * delta-T * Boilerinhoud * warmtecapaciteit water * 365 dagen in jaar</span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="csDC4A80">Eén opwarming kost dus</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">13 * 14 * 1.16E-3 * 1000 = 211 Wh</span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="csDC4A80">Minimaal</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">3 * 13 * 14 * 1.16E-3 * 365 = 231 kWh</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Oftewel 23 m3 gas</span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="csDC4A80">Maximaal</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">4 * 13 * 14 * 1.16E-3 * 365 = 308 kWh</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Oftewel 31 m3 gas</span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="csA27DA275">Methode 3</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Hier kijken we naar het ketelvermogen gedurende een opwarming.</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Opgemerkt moet worden dat er wel wat verschillen zijn tussen de individuele opwarmingen.</span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Iedere 30 seconde verschijnt een nieuwe meetwaarde</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Vermogen 23 + 19.5 +8 + 10 + 9 = 69.5 kW</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Over 2.5 min</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Dus deze opwarming vertegenwoordigt een energie van ( 69500 / 5 ) * ( 2.5 / 60 ) = 579 Wh</span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> Dus per jaar 1278 * 579 / 1000 = 740 kWh</span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span><img src="Boiler_files/image4.png" width="926" height="551" alt="" style="border-width:0px;" /></span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Vermogen 22.5 + 23 + 18 + 9.5 + 9 + 10 + 9 = 101 kW</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Over 3.5 min</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Dus deze opwarming vertegenwoordigt een energie van ( 101000 / 7 ) * ( 3.5 / 60 ) = 842 Wh</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Dus per jaar 1278 * 842 / 1000 = 1076 kWh</span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span><img src="Boiler_files/image5.png" width="940" height="593" alt="" style="border-width:0px;" /></span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Methode 2 gaf een waarde van 230 .. 310 Wh per opwarming.</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Methode 3 geeft een waarde van 580 ..840 Wh per opwarming</span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Het is duidelijk dat het vermogen van de ketel hier veel te hoog (factor 2 tot 3 ) wordt aangegeven !!</span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="csA27DA275">Methode 4</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Hier meten we het gasverbruik op dagen dat er niet gestookt wordt (zijn nu nog zeldzaam).</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">.</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Het verbruik is hier 0.08 m3 oftewel 0.8 kWh voor 1 opwarming.</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Dit is het gasverbruik van de piek die hierboven is gemeten 842 Wh, dat klopt dus exact !!</span></p><p class="cs14438CD8"><span class="cs1B16EEB5">Dus per jaar 1278 * 842 / 1000 = 1077 kWh</span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span><img src="Boiler_files/image6.png" width="930" height="559" alt="" style="border-width:0px;" /></span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs14438CD8"><span class="cs1B16EEB5"> </span></p><p class="cs95E872D0"><span class="csCF6BBF71"> </span></p><p class="cs95E872D0"><span class="cs7FC7682D">Created with Microsoft Office OneNote 2007<br/>One place for all your notes and information</span></p></body>
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