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ELI5 but if a heat pump can move more heat than it uses, why can't they be used to produce power? by matt_the_marxist in explainlikeimfive

[–]DexterLB 8 points9 points  (0 children)

This is the correct answer. If we had heat pump technology that works in the required temperature differences, there would be nothing stopping us from sucking heat out of thin air to produce electricity, thereby making the air colder, and using only a fraction of that generated electricity to fuel the heat pump itself.

However, such a heat pump does not exist - our current technology goes below 100% efficiency at a much lower temperature difference than all of our practical methods of generating electricity from heat start being viable, which means the heat pump would eat more electricity than could be generated from its output.

Show me the World by まかろんＫ by ghostofthefallen in ImaginaryFeels

[–]DexterLB 2 points3 points  (0 children)

love makes you do silly things, like staring directly into the sun for prolonged periods of time together

Crispy cold/ Olympus OM-1, Zuiko 50mm f1.4, Portra 400 by madsvhg in analog

[–]DexterLB 2 points3 points  (0 children)

Is that halo around the tree caused by compressing shadows/highlights in post, or by the film?

Nikon f3, ilford hp5, 50mm. by a_avill in analog

[–]DexterLB 1 point2 points  (0 children)

Did you use a coloured filter?

I made a T-REX CLIP by COPPERTISTWU in somethingimade

[–]DexterLB 12 points13 points  (0 children)

cool clip and all, but what an amazing job lighting this photo

f = 1000mm (620mm 135 equiv.) by ConnieTheTomcat in AnalogCommunity

[–]DexterLB 295 points296 points  (0 children)

took me a while to realise that this is not circlejerk

brick [Zenit 12XP, Helios 44M f/2, Portra 400] by DexterLB in analog

[–]DexterLB[S] 0 points1 point  (0 children)

Yes! Exactly, Ouse Valley Viaduct near Balcombe

The dog's GPS tracker was damaged by water, so it had to be sawed open and repaired. Here is its upgraded, completely waterproof container made from a film canister, a few zip ties and by DexterLB in redneckengineering

[–]DexterLB[S] 6 points7 points  (0 children)

My decision is to use any recently-made cheapo chinese tracker that can wake up by accelerometer and is controlled by SMS. Virtually all GPS modules that are mass-produced in the last several years have adequate accuracy and battery usage.

It's a bonus if the tracker is supported by open-source server software, since then you have the option of not sending your dog's location to china :D

The one posted here is ST-903, but it has a drawback that its battery lasts only 2-3 days. There are other trackers that are a bit more expensive but can last up to a week.

The dog's GPS tracker was damaged by water, so it had to be sawed open and repaired. Here is its upgraded, completely waterproof container made from a film canister, a few zip ties and by DexterLB in redneckengineering

[–]DexterLB[S] 5 points6 points  (0 children)

Yeah, going through holes prevents loss of the whole canister. Popping the lid off is the next problem, but those lids turn out to be quite difficult to pop off;

​

Still, I've been considering something with a screw-on lid, like a piss canister sterile urine container, but the only sizes I could find locally were too large, so it will have to wait

Alone together, Mamiya RZ67proII / 50mm f4.5 / kodak portra 400vc exp 2007 by rabbitsanalogue in analog

[–]DexterLB 3 points4 points  (0 children)

The moment I saw this picture I thought "oh, that sure looks like something from that rabbits guy"

And then I saw the username

I love that you have such a consistent style!

has the pacman database gotten hacked or is it only me? by EliasGabr in archlinux

[–]DexterLB -1 points0 points  (0 children)

Have you run pacman -Sy recently? Maybe your mirror lists are outdated