insolate [ˈɪnsəʊˌleɪt] vb (tr) to expose to sunlight, as for bleaching
On Mon, Aug 12, 2013 at 1:40 PM, Axil Axil <[email protected]> wrote: > Keep it simple. > > > > Fill a 10,000 gallon insolated tank truck with 20C water, and run it in a > loop to the Ni/H reactor. When the temperature of the water in the truck > gets to 90C, the case is proven. > > > > > > > On Mon, Aug 12, 2013 at 2:24 PM, Jed Rothwell <[email protected]>wrote: > >> Defkalion's demonstration wasn't bad. Any demonstration is tough. >> Something always goes wrong. It wasn't bad, but it could have been better. >> I have done demonstrations and I have taught and given lectures so let me >> offer a few suggestions based on this experience. >> >> Practice, practice, practice. Rehearse beforehand. Be sure you can >> comfortably complete the presentation in the time allotted. This was their >> biggest failing. >> >> Set up your props beforehand. As I explain below, in this case I would >> have put a black drop cloth on the wall and brought in a meter stick, a >> weight scale, and a bucket of water with a thermometer in it. >> >> Make yourself clear. Get to the point and stick to it. >> >> You need not write out every word, but it is a good idea to write down >> your talking points in the order you intend to present them. >> >> Here is the sort of thing I would have said: >> >> ". . . The inlet temperature is 21°C, the outlet is 115°C. Here on the >> screen we are computing enthalpy by the heat capacity of water. We ignore >> the heat of vaporization. However, at this outlet temperature we know the >> water has vaporized. Let's prove that. Let's take the outlet tube from the >> sink and hold it up next to this black drop cloth. [Holding meter stick >> next to plume.] As you see the plume of steam is around 80 cm long. The >> first 20 cm are invisible, which means the steam is dry. >> >> Now let us show that our flowmeter is correct and the water is flowing at >> 500 mL per minute. We will also show that the steam has about 1130 kJ of >> enthalpy per minute. We have placed this bucket on the weight scale. As you >> see it has 20 kg of water in it, and the water temperature is 21°C. Now >> were going to submerge the hose under the water for about a minute and see >> how much water condenses and how much the entire mass of water heats up. >> Starting NOW. [Splash! 'Buku buku buku' as bubbles say in Japanese] >> >> [A minute later] Okay we removed the hose after one minute three seconds. >> The weight of water has increased by 460 g. Some of the steam escaped from >> the water but most of it condensed. We see that the temperature has risen >> to 31°C . . ." >> >> And so forth. >> >> Prepare your tables and spreadsheets beforehand so you can describe >> results smoothly without stopping to do a lot of arithmetic. You need not >> state that the heat of vaporization is 2260 kJ per kilogram. The viewer can >> look that up later on. You need not explain that the bucket when empty >> weighs 820 g. The viewer knows about how much a plastic bucket weighs, and >> can see you have taken that into account. Skip the details; get to the >> point. >> >> As I said before, you demonstrate every key point twice, by two different >> methods. Ideally, one method relies upon precision instruments and the >> second method depends on first principles that are easily understood and >> easily measured, even if they are somewhat crude. The two methods must be >> completely different so that a single artifact cannot cause both to be >> wrong. >> >> People sometimes say that in a lecture you should tell the audience what >> you're going to say; tell them what you have to say; and then tell them >> what you just told them. I think this is going too far, but it does not >> hurt to repeat your key points at least once. >> >> I assume the people at Defkalion are doing similar demonstrations for >> potential customers and investors. So I think they should polish up the >> presentation and make it more convincing. >> >> - Jed >> >> >
