In reply to Axil Axil's message of Thu, 26 May 2011 18:55:32 -0400: Hi, [snip] >*Initial running to reach vaporization. *The temperatures of the inlet water >and the outlet water were monitored and recorded every 2 seconds. The heater >was connected at 10:25 and the boiling point was reached at 10:42. The >detailed temperature-time relation is shown in figure 6. The inlet water >temperature was 17.3 °C and increased slightly to 17.6 °C during this >initial running. The outlet water temperature increased from 20 °C at 10:27 >to 60 °C at 10:36. This means a temperature increase by 40 °C in 9 minutes >which is essentially due to the electric heater. *It is worth noting that at >this point in time and temperature, 10:36 and 60°C, the 300 W from the >heater is barely sufficient to raise the temperature of the flowing water >from the inlet temperature of 17.6 °C to the 60 °C recorded at this time. If >no additional heat had been generated internally, the temperature would not >exceed the 60 °C recorded at 10:36. Instead the temperature increases faster >after 10:36, as can be seen as a kink occurring at 60 °C in the >temperature-time relation. (Figure 6). [snip] Note that a water temperature of 60 C doesn't mean that that is also the temperature at which the actual reaction is taking place. A thermal gradient in the device (necessary for heat flow), implies that the actual temperature was higher, but how much higher depends on exactly where the reaction was taking place and what the thermal resistance was between source and water.
Regards, Robin van Spaandonk http://rvanspaa.freehostia.com/project.html
