An air conditioning... watch - Page 1
Forum section: electronics / general

author: nidlaX
author_rank: Frequent Contributor
timestamp: September 12, 2017, 10:51:29 pm
content: https://www.kickstarter.com/projects/1391357603/the-world-first-personal-air-conditioning-watch/

author: MarkS
author_rank: Unknown
timestamp: September 13, 2017, 12:06:51 am
content: They have to be using a Peltier element in the wrist strap. Not that this makes a bit of difference.

author: Cerebus
author_rank: Super Contributor
timestamp: September 13, 2017, 12:32:06 am
content: OK, let's run the numbers. I'll just do cooling, heating would be comparable. Also, I'm going to be generous and assume optimum performance from all the elements of the system.So, they don't say it, but this is obviously a peltier device. It has a 400 mWh Li-Ion battery so 0.4 * 3.7 = 1.48 Wh. 1.48 Wh * 3600 seconds = 5328 joules. Peltier devices can, in ideal circumstances, shift more heat than energy consumed. Let's assume an ideal CoP of 3, so this thing can, again under ideal circumstances, shift 15984 joules across the peltier device before the battery runs out.The specific heat of fusion of ice is 333.55 j/g, so the heat shifted by this device is equivalent to the work done by melting 47.92 grams of ice at 0C to produce water at 0C. So, it'll do the cooling work of, let's be generous, 2 ice cubes, one held on each wrist.This, any arts graduates listening, is the power of basic (I mean really basic) science to keep your money in your wallet when shysters come calling with gadgets on Kickstarter.

author: nidlaX
author_rank: Frequent Contributor
timestamp: September 13, 2017, 12:43:45 am
content: I mean, their goal isn't even to reduce your body temperature significantly. The claim is that they can make you "feel" cooler / warmer by using the Peltier to produce pulses of heat / cold on the nerves near your wrist...Marketed towards the same people who put their speakers on crystal pedestals and wear rings to cure arthritis.

author: m98
author_rank: Frequent Contributor
timestamp: September 13, 2017, 05:18:49 pm
content: I'd say, the concept is plausible, and they at least claim to have already tested it on over a hundred people.So be careful judging it too early.

author: hermit
author_rank: Frequent Contributor
timestamp: September 13, 2017, 05:26:27 pm
content: Quote from: nidlaX on September 13, 2017, 12:43:45 amYeah. I caught that too. That means if it works it could actually be dangerous because your body wouldn't be reacting appropriately to outside stimuli. You shiver and sweat for a reason.

author: hermit
author_rank: Frequent Contributor
timestamp: September 13, 2017, 05:27:41 pm
content: Quote from: m98 on September 13, 2017, 05:18:49 pmProbably just tested the marketing campaign.

author: Rbastler
author_rank: Frequent Contributor
timestamp: September 13, 2017, 06:07:00 pm
content: Great way to have 70€ less in your pocket and one wrist a bit cooler/warmer than the other.

author: cdev
author_rank: Super Contributor
timestamp: September 13, 2017, 06:28:25 pm
content: I saw something that tried to implement a Peltier device cooler a few years ago.It went around your neck. making contact with the sides of the neck. The area making contact with the cooling size of the peltier device needed to be both enlarged and the heat transfer between it and your neck, specifically, needed to be improved.Also, because the Peltier literally gets hot on one side and cool on the other the fans needed to direct the airflow in such a way that it would not warm you or your immediate area.However it did move some of the heat out of your body and into the air, for as long as its going. Because the area in contact with your neck was fairly small, and the slightly warmed air was exhausted right next to your head, the effect it delivered was minimal.Also, I got the impression its rechargeable batteries were inadequate for the task. It needed to be plugged into its adapter/charger to stay going. Not surprising. Interesting idea, bad implementation of it.

author: ddavidebor
author_rank: Super Contributor
timestamp: September 13, 2017, 06:36:40 pm
content: Quote from: nidlaX on September 12, 2017, 10:51:29 pmhumans are stupid

author: Cyberdragon
author_rank: Super Contributor
timestamp: September 15, 2017, 08:01:42 pm
content: Quote from: Rbastler on September 13, 2017, 06:07:00 pmExactly, while this is a real effect, it is extremely localized. So it would only affect the wrist and maybe that hand but that's it. This is a total BS snake oil scam!We should form a KS attack army to go and barate these bastards with real science!

author: cdev
author_rank: Super Contributor
timestamp: September 16, 2017, 12:41:07 am
content: It is really evil how people are picking things like this that they know wont work and sort of milking the public's ignorance of the science for dirty dollars. (or disreputable dinero)Who will keep them honest if people like us don't call them out?Quote from: Cyberdragon onTodayat 14:01:42>Quote from: Rbastler on 2017-09-13, 12:07:00Exactly, while this is a real effect, it is extremely localized. So it would only affect the wrist and maybe that hand but that's it. This is a total BS snake oil scam!We should form a KS attack army to go and berate these bastards with real science!

author: NiHaoMike
author_rank: Super Contributor
timestamp: September 16, 2017, 03:27:42 pm
content: The idea has been tried before.Getting it to the size of a watch would be basically impossible.

author: IanMacdonald
author_rank: Frequent Contributor
timestamp: September 17, 2017, 07:34:15 am
content: I've an idea - How's about developing a foot-operated engine activator for situations where your motorcycle has a flat battery?Could put it on.. Well, go figure.

author: Cyberdragon
author_rank: Super Contributor
timestamp: September 17, 2017, 10:26:50 pm
content: Quote from: IanMacdonald on September 17, 2017, 07:34:15 amLOL, just get one of those old two-stroke bikes where you started it by pedaling it.

author: mc172
author_rank: Frequent Contributor
timestamp: September 17, 2017, 11:22:04 pm
content: If their argument is that they want to trick the hypomagicamus, surely they'd want to stimulate an artificiallyhightemperature when you're too hot in order to get the body to sweat more than required to lower body temperature...?

author: Skashkash
author_rank: Regular Contributor
timestamp: September 17, 2017, 11:51:32 pm
content: It's like a wrist mounted thermal grill illusion generator.Reprogram it as a Dune pain box (on the wrist).

author: EEVblog
author_rank: Unknown
timestamp: October 16, 2017, 08:45:41 pm
content: This Prime qualityis BACK!https://www.indiegogo.com/projects/aircon-watch-the-world-s-first-personal-a-c-watch

author: Cyberdragon
author_rank: Super Contributor
timestamp: October 16, 2017, 10:49:53 pm
content: Alright, time to explore the comments for some idiotic gold!From Indegogo:Quote

author: snoopy
author_rank: Frequent Contributor
timestamp: November 13, 2017, 12:05:55 am
content: Quote from: EEVblog on October 16, 2017, 08:45:41 pmWow I just saw this today and did a search for it here. I knew I didn't have to start a new thread about itSounds like Next Level Bullshit if I ever saw it. Don't know which is worse. This or the airing ?OK where is thunderfoot to expose this ?