All humans want to be comfy, but the first air conditioner wasn't built for us--it was for a printing press!
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Hosted by: Hank Green
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One time in a hotel I made a blanket fort in between the beds and used the hair dryer on cool mode and the ice bucket to make AC because it would get really hot and to this day I am so proud of that moment
Air conditioners that use water instead of weird chemicals? We already have those. It's called a SWAMP COOLER! :) Yes, really--don't know why the weird name. What it does, is pump some water up into these pads and saturate them, then blow air through the wet material and tada! the air is cooler. Only works well in dry climates, though.
Air conditioning is awesome but the way we use it to death these days can't be healthy, there's evidence that it contributes to all sorts of health problems both directly and indirectly, from obesity to asthma
Very bad invention, only perfect for ruining people's eyes by spreading germs and dust everywhere, cause the people in charge of changing filters don't do it at all, so there's a lot of crap in AC units being blown into people's eyes. This ruined my eyes for the rest of my life, it was a nightmare.
Hey hey! Yay Emerson!
Any chance you guys are planning a video on the efficiency of types of refrigerator currently available on the market and their use in different climates? Maybe even go over a list of common issues that arise in aging units: how to recognize them and distinguish between DIY maintenance types from when to call in a professional....
It seems that Hank merely read a very bad explanation that he himself does not understand. This was a very poor explanation of how an air conditioner works, its not even a good hand-waving explanation. One more BS award.
There is no such thing as "heat energy". That's _exactly_ like saying kilowatts multiplied by kilowatt-hours is energy. Wrong, just plain wrong. The air doesn't have "heat", heat is what happens when air transfers it's thermal energy to the refrigerant. Heat = power = work = Watts! (Heat and work being specific cases of power, measured in Watts).
Air conditioners are a mixed blessing. Huge amounts of energy are wasted by using them without thinking. In particular when architects do not consider the thermal properties of their buildings, giving them huge glass fronts and making them essentially greenhouses. Also offices are often cooled down way too low. I worked in a place where I had to bring a wool sweater in the mid of summer. Buildings are cooled throughout the weekend when nobody is even there. Large areas like foyers are cooled down. It's all a huge waste and goes beyond basic principles of sustainability. Also, air conditioning systems tend to spread germs throughout the building, this is a huge problem in hospitals. I considered having an air conditioner installed in my home last summer because it was terribly hot. In the end, I bought semi-transparent shutters to attach to the outside of my windows. Problem solved, at a fraction of the price, if you factor in the energy bill.
I think this could potentially change the way homes are cooled!
A portable swamp cooler (or a circulating air swamp cooler) running inside an air conditioned house (in conjunction with the air conditioning) should compliment each other correct? the air conditioner removing moisture for the swamp cooler to work and the swamp cooler helping the air conditioner by "re-cooling" and adding humidity to the air. Should this not increase efficiency?
Hank Green is Awesome!
wasn't the most detailed explanation but to the average person who knows nothing beyond a thermostat I believe it's a basic understanding and little background history of how it all began. good job guys!
"We take air conditioning for granted"
Speak for yourself. I keep mine in tip-top shape. Clean them when I need to, store them in their original box and keep them safe and occasionally dust them in the months I don't need them. Those things are expensive, and I intend to keep mine alive for as long as I can. I hate the heat and summer with a passion, so they are essential for my survival during that time period.
I'm a heating and air conditioning technician/engineer. This was pretty good. The explanation of the refrigeration system could have been better though. The key people you're missing in there is the metering device, otherwise known as a thermostatic expansion valve in most cases. I won't bore anyone with the details. I just thought my point of view was worth sharing considering I do this for a living.
What the video doesn't mention is the real reason only certain materials are used. They have to be able to boil in the evaporator coil (the cool part) and condense in the condensation coil. Evaporation and condensation are called phase changes ( a substance change from say, solid phase to liquid phase - ice melting is an example of a phase change). Phase changes either absorb or release a tremendous amount of energy, depending on which direction you're going thermally. Another handy feature for an air conditioner is that during phase change, the substance stays the same temperature, regardless of how much heat it absorbs or releases. That means an air conditioner can reliably keep the evaporator (cool) coil just above freezing to get the maximum cooling without clogging up with frost. The boiling point is pressure related, so if your a/c is low on coolant, the lower pressure in the evaporator side will drop the boiling temperature below freezing, which is why a/c units that are low on coolant tend to ice up.
The only one keeping you inside during rain is you. I used to be a polar bear that suffered real heat exahustion in on 82 F, but since aging past 40 can now jog in 100 F as long as the humidity is really low. No one size fits all climate, eh?
I would think using magnetic fields rather than chemicals to cool/heat the air would be much more energy intensive. With A/C already creating a huge drain on the grid, and the majority of our energy coming from fossil fuels, how would this be better? Wouldn't the products of the increased burning of the fossil fuels be just as bad, if not worse, than any potential leaks from the air conditioners?
Air conditioners are a terrible waste of energy resources. People should just adjust their lifestyles, clothing, fitness, psychology to deal with temperatures. The planet is dying from frivolous wasteful activities. We need to start conserving, have birth control, and be practical.
Air conditioning was literally the best invention since the beginning of time. I wouldn't want to live in a world without it. Actually, I couldn't. Because heat is, after all, the number one weather related killer, so air conditioning is a basic necessity that we literally can't live without. If it hadn't been invented, we would have all died heat-related deaths by now.
You think you north hemispherans are suffering? Come to where I live, it's summer 365 days a year, temperatures regularly above 30 degrees Celsius. Worst thing is, the humidity is so high you sweat a lot, making it feel even hotter than it is...
Was it on purpose that CFC was in Light green and HFC was in pink? The colour codes for R22 (CFC) is light green and R410 (HFC) is pink.
Also, propane is beginning to be used again under the name "R-290" in small beverage coolers and sealed units.
It's funny cause here in France even though it's pretty hot in the summer, we don't really have - and never really had, maybe it's changing but i don't know - domestic air conditioners. It seems to be at least partly cultural.
+ct92404 Im quite sure enduring 4 seasons is much better than enduring year-round summer-like temperatures. Just my opinion though. If I got the chance to visit a cold country, especially one with snow, I would agree in a heartbeat.
+Hua En No, it only gets that hot during the summer. July-September are the hottest. It does get suprisingly cold here in the winter, but not as cold as other parts of the country...we don't get snow here either, only up in the mountains.
There are some places where it would actually be pretty much impossible for people to live, or at least impossible to build a large economically successful city, if it wasn't for air conditioning. I live in southern California, and it has been hotter than hell here the past several days. It was 108 degrees Fahrenheit outside. I really think artificial refrigeration/cooling, electricity, and antibiotics are the 3 most important discoveries that advanced civilization the most.
in sandblasting equipment we have to wear a helmet that supplies fresh air so we won't breath in the dust. On the back of the helmet, were the air hose connects to, there is a coiled tube. What the tube does, is that it uses centrifical force to 'sling' out the heat from the air before it enters the helmet. and it work very well.
low freon can cause a frost line to slowly build until it encompasses the entire evaporator coil, the filter may be dirty restricting airflow, the evaporator could be dirty, the thermostat could be bad, the room may be to small, something may be blocking the airflow causing the air to super cool, etc...
Hi, I asked my teacher this but he is unsure of why it happens. Why does air appear cooler when you fan yourself when it is really just the same hot air you are fanning? Does it actually cool it, and if so, how? Please make a video on this, I am very intrigued as to how it happens. Can you mention my name when you ask the question too please, so when I show my teacher the video he knows it was actually me that asked it, instead of me just finding the video.
The movement of air over your skin does not cool you down innately, but it does cause water molecules that are on your skin due to sweat to evaporate. This evaporation requires heat energy to occur and so when it happens it removes heat from your body.
venting hot air out wouldn't involve an open window scenario they would just funnel it to a location they can isolate from the rest of the stations oxygen and then release it into space. basically imagine a room with 2 doors that when closed are sealed perfectly all one would need to do is open one put what they don't want in it then close that door and open the other one.
It might be that way but I am not sure that is why I'm asking. The reason why it doesn't sound like a great way to do it is though they have the ability to jettison waste, for the AC you're kind of talking about leaving a window open. That doesn't sound like a low risk approach. With waste, you can put it in a chamber, vacuum that chamber, then jettison it in one moment. But you might be right...I would just be surprised if that's how they do it.
so why don't you think venting the heated air into space would work? you say you don't think it would but you can't (or won't) explain what you think the problem is. btw water on space stations is typically recycled so if they used water cooling chances are it would likely be cooling water using it to cool air and then re-cooling the water for reuse rather than ejecting it into space or letting it evaporate.the tech for that isn't that difficult to figure out i would imagine it would be as simple as having a refrigerator in space.
I understand space is both very hot and very cold. For example in sunlight it is 200 plus degrees F. In the shadows and night it drops to something like -200 F. So in an orbit it swings 400 degrees every few minutes since an orbit takes around 90 minutes.
I guess what I don't follow is that the AC works by passing air over a coolant and blowing that air in while blowing the now heated air out. You still can't operate a space AC by holding on to the heated air or venting it out (as far as I know) so I'm confused how it would work. It might use some other method like water cooling (like how a boat engine is cooled) or something but even that has a flaw in that water is heavy (expensive) and this is quite wasteful.
unless i'm terribly mistaken isn't space for the most part very cold making an air conditioner redundant? also technically you can vent heated air into space (or at the very least i don't see a reason why you couldn't) the main problem would be getting maintaining the level of oxygen in the space station while venting air which if they actually do that i would assume they already have a plan for (likely oxygen tanks or some other supply venting air in)
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