Handy Cooler is necessary, but I could’nt find it, so I decided making my own again (Part 1)

In the coming summer, the fear of dying from drying just by going outside is increasing, so I want a portable cooler that can be carried at any time, but even if I search, there are many large things like cooler boxes and it lacks ease, and recently small things that fit in the palm of my hand have come out, but the price is not reliable and it is difficult to put out a hand. So, although I made my own work last year, it was still a little difficult to s

ize, and it was not good in terms of performance. So, I’ll consider it again. Last time I used ice (http://hatsumeiyaro.tech/hello-world/), I would like to go to Peltier this time. I want to aim for one-handed size. I’d like to make it something like a cold ve

rsion of a hot cairo. So, first of all,
the content that I have decided is (1) power supply: m
obile battery or 4 to 5 AA batteries (2) Maximum size of cooling part: Palm
size 5
0mm ×100mm×40mm. The way to make it cold is probably not much cold with the above power
supply, so it should be as cold as possible anyway. If it gets too cold, cover it with a handkerchief or something to s

uppress it. So let’s make it immediately! I thought, but I do not know the design method at all because I do not know electric
ity at all. I looked it up for the time b

eing and found the following. (1)
It is easy to understand riding from the theoretical formula of S
olid Fix spelling co., Ltd. to the design method. http://www.solidphysics.com/index.html(2)

Research on electronic cooling elements
and application circuit production Thesis of Setsunan University. It is eas
y to understand with experimental data and design examples. http://www.shipsunan.ac.jp/~shikama/GraduationStudyAbstract/11EOSL/summary_kanamaru.pdf But I still didn’t know which of the many Peltier

s to choose. Looking at peltier’s characteristics with an amateur eye, I thought that
if the “maximum heat absorption amount” was the same current value if the same “performance index Z” was the same current value, the heat absorption surface temperature must be lower and cooled, but in the experimental data of the paper (Figure 2) in (2), the lower
the “maximum heat absorption” was, the lower the heat absorption surface temperature. That? So, looking at the theoretical equation (URL below) of (1), the higher the resistance R, the greater the absorp
tion heat (http://www.solidphysics.com/dtmax.htm), the peltier characteristics table (http://akizukidenshi.com/catalog/g/gI-00485/, http://aki Looking at zukidenshi .com/catalog/gI-14881/), the TEC-12706 has a smaller “maximum heat absorption” than the TEC-12708 (51W<81.7W), but has a higher resistance (about 2Ω> about 1.5Ω). I wonder if the maximum value of the absorbed heat amount is that the larger the “maximum heat absorption”, the smaller the inclination to the maximum value? I decided to think without permission. This time, using a mobile battery,

etc., since it is not possible to give a current up to the maximum absorption heat, I wanted to make it as small as possible, the “performance index Z” is large, and the resistance value R is large.