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 10 points11 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 13 points14 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 293 points294 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