Hello Simon,
thanks for the full review)) the reason I have mentioned Ti is from a camping experience. I have also tried Al cups but they loose to Ti I would say by 20-30% in time for heating, but in cooling for some reason Ti cools within few seconds while Al or Cu takes much longer time. In PCR cooling takes probably the most time as i have noticed I am not sure if there is a relay to switch Peltier's polarity so the hot side turns into cool side but perhaps by placing a second pertier unit right under it will harvest all the heat from the one that is attached to the heat sink perhaps...
I recently met a guy who works for AUTOCAD he mentioned that they are working on liquid cooling PCR where it is heated the normal way not sure which is it peltier based or by enduction, but he said that they are trying to design a water cooled heat sink similar to the computer liquid cooling system so as he mentioned times could be cut from 3h to 30min not sure how is it possible if 30 cycles by itself are 30min but thats what I have heard.
There is another thing GE works on is magnetic cooling which creates magnetic field to align molecules and force them to loose the energy, i believe they already have built the prototype of a new type of refrigerator not sure how fast that would be but lack of any mechanical parts would definitely have a benefit as well as lack of peltier units which in my experience break quiet often.
On Mon, Feb 15, 2016 at 8:06 AM, Simon Quellen Field <sfield@scitoys.com> wrote:
Titanium has a heat capacity of 0.125 calories per gram.It thus sits between aluminum with 0.22 and copper with 0.092.The thermal conductivity of titanium is about 12, on a scale where copper is 223, and aluminum is 118.As titanium has a density of 4.43, to copper's 8.96 and aluminum's 2.7, and titanium is stronger than copper, I suspect that a titanium cup weighs less than one made from copper, and perhaps also one made from aluminum.Boiling water in an aluminum cup might take a tiny amount more time than in a titanium cup, due to the slight difference in heat capacity and mass, but it will be dwarfed by the heat capacity and mass of the water, and any difference may be difficult to measure.The low thermal conductivity of titanium is a problem, since it will heat unevenly. A copper bottomed pot will heat more evenly (which is why you find copper bottomed pots for sale), and aluminum is not far behind. But you would not want to scramble eggs in a titanium skillet over a fire -- you'd have to be very careful not to scorch them. Cast iron skillets, known for their low thermal conductivity (you can hold the iron handle while the rest of the skillet is in the fire), still have three times the conductivity of titanium, and use their mass to make up for the low conductivity, heating slowly enough that the heat has time to even out.For a thermocycler, you want something with low heat capacity, low density, and high thermal conductivity. Graphite would be very hard to beat. Aluminum would beat titanium because of the dismal thermal conductivity of the latter.The price of the titanium used in camping gear has fallen to about $4 a kilogram due to new cheaper manufacturing processes. Aluminum is $1.47 per kilogram, and is easier to machine, and much more thermally conductive, and less dense (2.7 g/cc to titanium's 4.5). These make it much preferable as a heat sink material, and also preferable in a thermocycler.--On Mon, Feb 15, 2016 at 5:57 AM, Alex D <alexxxdean@gmail.com> wrote:HI all,I dont really understand how Ti is not an option here? I have looked at the tables and Ti is stated 20x less then copper and roughly 10 time less conductive then Al ? I am not a specialist in this area so perhaps someone could clarify or had an experience with Ti? But I do camping sometimes and all of my cooking equipment is Grade A titanium, what I can add is when you boil a water in titanium cup and then pour water out of it, the cup itself goes from ~90C to room temperature in a matter of 3-4 seconds. Also I have used the titanium cups to boil water on the fire and on the induction oven , I havent tried copper cops but it boils water definitely twice faster then any Al cups ive had.anyone can clarify on that?To view this discussion on the web visit https://groups.google.com/d/msgid/diybio/CAMf9%3DRN-6N9bCMEVF4pB2KBCfWugaFyAgqK_0E2Vo8%2B4qFCzpQ%40mail.gmail.com.--On Fri, Feb 12, 2016 at 5:02 PM, Lee Nelson <technologiclee@gmail.com> wrote:You could use metal infused filament and 3D print the block.
https://blog.pinshape.com/3d-printing-metal/
You may be able to make a computer model of the heat transfer on a site called SimScale.
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