Horace Heffner <[email protected]> wrote:
> First, let me say, despite the casual, inaccurate, and one data point > nature of the method shown, it is far better than any calorimetry applied in > Rossi public demos. I agree it is better for steam. It is the only reasonable way to measure a mixture of steam and hot water. I suggested that they combine this method with other methods because this only produces one data point per test. It only works when power is stable. So you need another method to be sure that it is stable. The steam hose appears larger than Rossi's. > Maybe, but it is difficult to judge how much steam is coming out just by appearance. The second temperature measurement was all over the place, due to the > inadequate stirring method. The reading varied from 29.9°C to 31.1°C. Yup, stirring is the problem. You need to stir vigorously with a stick or something like a Dremel tool with a paint mixer attached. (Like a giant eggbeater.) > No estimate of heat loss through the bucket was made. This means more heat > was produced than measured. It would obviously be better to insulate the > bucket. > I doubt that is a problem. It is easy to find out whether it is a problem or not. You leave the thermometer in the bucket for 5 minutes, keep stirring, and see how much the temperature falls every minute. I have often done this. With a bucket of this size and water at that temperature I do not think the temperature will fall significantly in a minute or two. > The scale readings were very blurry in the video, but still not consistent > with the text proportionally. It appears at 0.33 in the Mario video (see > Mario0_33bucket.jpg in separate email) that the tare was adjusted for > (zeroed out on the scale), and the major divisions are 2kg, and the next > lower level division are 1 kg, since it is stated 10 kg of water was > initially in the bucket. > I do not know if the weight scale was zeroed. I recommend a digital weight scale for this kind of thing. Note that this technique captures all enthalpy including the kinetic energy of the moving steam. - Jed
