maxomill Posted June 1, 2018 Share Posted June 1, 2018 I have a 300l solar geyser that im not impressed with I was expecting at least 55 degrees in summer it has 3 flat plate collectors and I have barely seen it get over 50 degrees even in summer so I seem to use a lot of Eskom can anyone explain what amount of power it would take to lift the temp of 300l by say 20 degrees as maybe I'm shooting this thing down without seeing all the facts cheers maxomill Quote Link to comment Share on other sites More sharing options...
pilotfish Posted June 1, 2018 Share Posted June 1, 2018 I have 2 flat plate collectors on a 200L geyser and it is great (only 2 people in the home though), I get 50' in mid winter and 75' in mid summer - maybe it is something else in your installation that is at fault. Is it thermo-syphon, direct, or indirect (glycol)? ___ 1 Quote Link to comment Share on other sites More sharing options...
Chris Louw Posted June 1, 2018 Share Posted June 1, 2018 Hi Maxomill use this. Q=mc (T1-T2) /3600 . Q = Energy Kwh needed to raise water temp from T1 to T2. . m = mass of water . 300 kg c= specific heat of water (4.19 kj / kg/ C) 300 lt with 3 Kw element heat 9 degrees C per hour . Without any sun We have a 100 lt geyser with 1 plate collecter ( 2 .2 ) and on very hot days have to releas some hot water 78 degrees . Sunny winterday 50 -56 degrees. Quote Link to comment Share on other sites More sharing options...
___ Posted June 1, 2018 Share Posted June 1, 2018 38 minutes ago, Chris Louw said: Hi Maxomill use this. Q=mc (T1-T2) /3600 . Q = Energy Kwh needed to raise water temp from T1 to T2. . m = mass of water . 300 kg c= specific heat of water (4.19 kj / kg/ C) Slightly simpler... 1.16Wh per liter per degree centigrade. You can derive it from basics if you want to, but I find this is a little easier to remember. So lifting 300 liters of water by 20 degrees: 300 * 20 * 1.16 ~= 7kwh. maxomill 1 Quote Link to comment Share on other sites More sharing options...
maxomill Posted June 1, 2018 Author Share Posted June 1, 2018 thank you all . its a high pressure system with a thermo siphon jacket around the cylinder. this is my issue 7 kw to lift 20 degrees means its doing its thing and seemingly quite well but then why am I the only person complaining that my water is not hot enough btw I even tried a circulation pump to rule out a air lock in the heating system , no change . seems like it is what it is for me , maybe just a bad design bad angle cheers all Quote Link to comment Share on other sites More sharing options...
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