Horace Heffner <[email protected]> wrote: You have to be kidding. This is supposed to represent a due diligence > test??? Wow, there must be a huge market for a device that can heat water > from 15°C to 20°C for 18 hours. >
Slow down the flow and you can make it as hot as you like. When a boiler engineer tests a boiler, they open the tap (or turn the pump up) as high as it goes and they measure the flow and temperature for 30 minutes or an hour, until the temperature stabilizes. They do this to test the circulation as well as the COP (efficiency). They need to be sure the tap or pump are not clogged. There are rated numbers written on the machine, showing how high the Delta-T temperature and flow rate at full power should be. It has to meet the standards. These tests are very reliable. They are exactly the same as the one Levi et al. did. > Attaching the inlet flow directly to a faucet - very scientific! Not being > able to adjust the flow rate so a good delta t can be obtained - very > professional! > How the hell do you think they do it in any apartment building or factory?!? Yes, this is very professional. It is exactly what professionals do all day long. > Still using a thermometer stuck down into the foil wrapping I suppose - > how very transparent. > They use thermocouples, which are more accurate and precise than the bimetallic dial thermometers used in most industrial boilers. They used the same kind of flowmeter any building or large boiler is equipped with. These are industry standard instruments & techniques used the way they are intended, smack dab in within the normal range of power they are intended for. > Very sophisticated water mixing to be sure the input and output temperature > measurements are correct - not! > No one ever mixes the water in a boiler test. The temperature probe for the thermocouple or dial thermometer is a long metal rod, fully immersed in the flow for most of the cross section of the pipe. It has to average the value. Metal conducts heat. You do not want "sophisticated" methods for something like this. You want proven, industry-standard methods. Do you seriously believe that several billion dial thermometers and thermocouples on boilers worldwide cannot reliably measure a 5°C temperature difference?!? > Your argument against using a barrel of ice or cold water being too > dangerous falls apart here too - the output temp s only 20°C. > The barrel of ice will melt in no time -- same problem as the sparge test. Besides, if you use any method other than the industry-standard, ASME recommended one, the skeptics will say you are an amateur using unproven techniques. And why the heck should they re-invent the wheel anyway? A technique that has been used reliably hundreds of thousands of times a day for 150 years is RIGHT. It WORKS. It is insane to question such methods. You don't believe that. You suppose there are water mixing problems. But you are wrong. - Jed
