India heatwave temperatures pass 50 Celsius • Hacker News Board

Re: India heatwave temperatures pass 50 Celsius

#251

Post by saeranv » Sun, Jun 02, 2019, 8:46 PM UTC

YeGoblynQueenne wrote: post #235

ajross wrote: post #130

Earlier quoted context omitted.

A tub will work, sure, as long as it's pulled from a large body of water that hasn't warmed up with the air. Hopping in the local lake is an obvious choice. But in a detached demographic sense: effectively everyone lives in a city in the modern world, and while their housing might not be air conditioned most of the major buildings are. In an emergency like this everyone would just crowd into office buildings and shop…

Air conditioning itself is a significant contributor to greenhouse gas emissions, via energy consumption: https://www.rehva.eu/knowledge-base/rehva-journal/chapter/ai... See the pie chart on page two: eletricity consumption from cooling systems is 17% of global consumption. The IPCC expects this usage to rise as temperatures rise. I would also like to challenge the notion that human beings understand how to use air c…

Also the AC dumps heat outside, which in urban areas contributes to local heat increase (i.e Urban Heat Island effect), which in turn requires even more AC too fight.

Re: India heatwave temperatures pass 50 Celsius

#252

Post by wongarsu » Sun, Jun 02, 2019, 8:51 PM UTC

newnewpdro wrote: post #245

the8472 wrote: post #206

Earlier quoted context omitted.

Don't ACs dehumidify by condensing the water? If so then it means they need to get rid of the heat of vaporization, the same amount of energy the humans shed by evaporative cooling.

In a closed system sure, but I'd expect a larger building to have significant fresh-air return systems. In a scenario where you've filled the place with people, the interior humidity is going to exceed that of the exterior air and you'd just start dumping the moisture outside exchanging with the fresh, dryer air. It's a comfort regression sure, but not a everyone dies situation. The survival of the people doesn't com…

> In a scenario where you've filled the place with people, the interior humidity is going to exceed that of the exterior air and you'd just start dumping the moisture outside exchanging with the fresh, dryer air. It's a comfort regression sure, but not a everyone dies situation.

That's equivalent to opening a window without the AC doing anything. If that would work we wouldn't be in a "crowd everyone into a shopping center" type situation, the people would be just fine outside in the shade.

> It's a desert, not the tropics.

While half of India is in the tropics, this part indeed isn't. But next month the monsoon will put humidity at approximately 100% [1].

1: https://en.climate-data.org/asia/india/delhi/new-delhi-30/

Re: India heatwave temperatures pass 50 Celsius

#253

Post by newnewpdro » Sun, Jun 02, 2019, 9:30 PM UTC

wongarsu wrote: post #252

newnewpdro wrote: post #245

Earlier quoted context omitted.

In a closed system sure, but I'd expect a larger building to have significant fresh-air return systems. In a scenario where you've filled the place with people, the interior humidity is going to exceed that of the exterior air and you'd just start dumping the moisture outside exchanging with the fresh, dryer air. It's a comfort regression sure, but not a everyone dies situation. The survival of the people doesn't com…

> In a scenario where you've filled the place with people, the interior humidity is going to exceed that of the exterior air and you'd just start dumping the moisture outside exchanging with the fresh, dryer air. It's a comfort regression sure, but not a everyone dies situation. That's equivalent to opening a window without the AC doing anything. If that would work we wouldn't be in a "crowd everyone into a shopping…

> That's equivalent to opening a window without the AC doing anything.

Even when the air temperature at your fresh air intake is cooler than the air at your condensor coil? Wouldn't we assume no system would draw its fresh air from near the condensor coil?

You still have a heat pump in the system, and there's a temperature difference between the air inlet and the pump outlet.

Re: India heatwave temperatures pass 50 Celsius

#254

Post by Scoundreller » Sun, Jun 02, 2019, 9:32 PM UTC

inflatableDodo wrote: post #241

Scoundreller wrote: post #236

Earlier quoted context omitted.

Being too poor to not have enough food, or experiencing a crop failure, does not meet official definitions of refugee eligibility: https://www.unrefugees.org/refugee-facts/what-is-a-refugee/

It does meet common dictionary definitions though - https://en.oxforddictionaries.com/definition/refugee

Your link’s definition limits it to issues of war, persecution or natural disasters.

A crop failure might be a natural disaster, but lots of other causes of starvation that are not.

Main point is, if you’re seeking refuge, try to put a clear-cut reason down rather than something debatable, but sensible, like absolute poverty.

Re: India heatwave temperatures pass 50 Celsius

#255

Post by 21717117 » Sun, Jun 02, 2019, 10:19 PM UTC

gingabriska wrote: post #47

jessriedel wrote: post #38

The 50 C number was observed in a desert. Death Valley, California, also a desert, spend 5 consecutive days above 54 C in 1913, the year it set the temperature record of 56.7 C.

Actually it's also bad in densely populated areas where the bitumin starts melting and sticks to your car tyres and shoes. I traveled there.

For the Americans, bitumin is aka asphalt.

Re: India heatwave temperatures pass 50 Celsius

#256

Post by sizzle » Sun, Jun 02, 2019, 11:46 PM UTC

marktangotango wrote: post #177

hedora wrote: post #93

Earlier quoted context omitted.

For people that don’t know, Death Valley’s name is no exaggeration, even in modern times. Going outside there even for short periods of time is extremely dangerous for some fraction of each year. They shut the park down when this happens. A few years ago, some tourists that didn’t heed the warning ended up dead after rental van overheated. I don’t see how the populated areas already hitting comparable temperatures wi…

I was at NTC (south of Death Valley in the Mohave) one summer when the temp was 125-130F for a week. We were in the box the entire time. We used ice filled camel backs, sucking water all day (and rarely urinating) First sgt would bring out pallets of bagged ice that would be half melted by the time they got to us. As a side note; 125 feels cool after spending all day in, and then climbing out if a M1A1! Really odd th…

This is an incredible story. Do they regularly operate out there in these extreme conditions?

How did you keep your electrolytes balanced drinking all that water?

Re: India heatwave temperatures pass 50 Celsius

#257

Post by rrrazdan » Sun, Jun 02, 2019, 11:52 PM UTC

yantrams wrote: post #68

This has been the case almost every year this decade in India. Also, it is quite common for the government departments to fudge data and report temperatures > 50 Celsius as 49.x to avoid halting work / paying extra to those working under the Sun because there are regulations concerning this. Edit: I got to know about this practice being rampant through an activist in the South who is well versed with the labour laws.

Can you cite a source for this? This seems like an urban legend imported from Dubai or the UAE, where it may actually make sense. But I have never seen regulations or the 50 C mark being treated as some barometer of extreme heat in India.

Re: India heatwave temperatures pass 50 Celsius

#258

Post by bufferoverflow » Mon, Jun 03, 2019, 12:26 AM UTC

blensor wrote: post #226

bufferoverflow wrote: post #223

Earlier quoted context omitted.

Zero if it runs off solar.

I'm not sure if it's an actual issue but solar panels are quite dark and get really hot. I could imagine that a huge solar array does measurably heat the immediate surrounding area.

Even if it were true, it doesn't produce extra CO2.

Re: India heatwave temperatures pass 50 Celsius

#259

Post by marktangotango » Mon, Jun 03, 2019, 1:08 AM UTC

sizzle wrote: post #256

marktangotango wrote: post #177

Earlier quoted context omitted.

I was at NTC (south of Death Valley in the Mohave) one summer when the temp was 125-130F for a week. We were in the box the entire time. We used ice filled camel backs, sucking water all day (and rarely urinating) First sgt would bring out pallets of bagged ice that would be half melted by the time they got to us. As a side note; 125 feels cool after spending all day in, and then climbing out if a M1A1! Really odd th…

This is an incredible story. Do they regularly operate out there in these extreme conditions? How did you keep your electrolytes balanced drinking all that water?

Irrc they did give us stuff to mix with the water; MREs generally have something as well. A lot of us didn’t use it due to fouling your camel back and canteens. I used to eat the salt packet for example (salt and pepper condiment pack). And yes they did this all the time; all through summer and winter; weather is not a deterrent; train how you fight, fight how you train is how the motto goes.

Re: India heatwave temperatures pass 50 Celsius

#260

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