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Post by shilo on Nov 30, 2015 12:15:19 GMT -8
peter I think that at the first minutes, cold masonry and cold water tank will be not so different.
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Post by peterberg on Nov 30, 2015 13:42:36 GMT -8
True, but the water tank will never be hotter than 100 C, in contrast with masonry which is heated up.
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Post by dustinmattison on Nov 30, 2015 14:05:29 GMT -8
peterberg I am thinking maybe I don't need a bell. I don't need to heat the space around the stove. Why not just think of this system as a big barrel that has a water tank sunk into the top? I could make the distance between the heat riser and the barrel about 4 inches, then after the water is heated I might have enough heat left to heat a bench? What do you think? Dustin
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Post by peterberg on Dec 1, 2015 4:06:24 GMT -8
Not the faintest idea, this is uncharted territory for me also.
Dustin, You would do better to have all your questions about this one heater in one place. As ti is now it is scattered all over the place and some questions are asked twice in different threads. This is called double posting and is frowned upon at this forum. Could you decide which of the threads is most important and stick to that, please?
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Post by shilo on Dec 2, 2015 23:24:36 GMT -8
"then after the water is heated " liquid water can never be heated. it stay always relatively cool (100c max)
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lawry
Junior Member
Posts: 113
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Post by lawry on Feb 14, 2016 13:24:03 GMT -8
Hello Peter and Klemen, Thanks very much for both your replies. I am familiar with the terms ISA and CSA, but I'm thankful for the further explanation. My initial question was more regarding how the ratios and calculations were performed. I'm probably best to give an example from your initial post Peter. You say to take 1% of the 6 inch riser CSA and have this divided into the CSA of the system riser under discussion. So the CSA (in square metres) of the 6 inch system (150mm) is 0.075 by 0.075 by 3.14. This gives a CSA of 0.01766 metres squared. So one percent of this is 0.0001766. Now let's say that we are looking at a 10 inch system. The metric CSA of this in metres again is 0.125 by 0.125 by 3.14. This gives 0.04906 metres squared. So now if we divide 0.04906 by 0.0001766 this gives a figure of 277.8. By extrapolating your initial figures above, I would come up with something around 13 square metres for a 250mm (10 inch) system. Can you tell me were I'm going wrong here? Guys i m also struggling with the ISA calculation for the different CSA. I also get to the same 277.8 figure for a 10" system. The only way to get to the 13 sqm is to extrapolate. Can someone take us through the calc.
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Post by peterberg on Feb 15, 2016 5:15:26 GMT -8
As of today, I like to go by the ratio between the respective riser CSA to calculate the ISA. Between a 15 cm and a 20 cm system there's a ratio of 1.774. Between a 15 cm and a 25 cm system there's a ratio of 2.77. Between a 20 cm and a 25 cm system there's a ratio of 1.56. Both 2.77 multiplied by the 5.3 ISA of a 15 cm system and 1.56 multiplied by the 9.4 ISA of a 20 cm system gives an ISA of about 14.6 m2 for a single bell.
This is still empirical, you would be the first one to try out whether this is correct or not. The whole development of those batch box and bell combination is still a work in progress. You are on unchartered territory so to speak, and obviously I would very much like to get feedback on this matter.
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