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/cgi-bin/YaBB.pl General Category >> Politics, Religion (Tall Table) >> Killer deals..... /cgi-bin/YaBB.pl?num=1583422255 Message started by raydawg on 03/05/20 at 07:30:55 |
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Title: Killer deals..... Post by raydawg on 03/05/20 at 07:30:55 I am a frequent flyer on Alaskan Airlines...... Just got a email from them this morning about how they are dealing with the C-virus. They then use the opportunity to share that they will not charge extra for any cancellation fees, for cancelling, you get a refund in total.... through 2021. THEN..... they went on to share some of the fairs/deals they are offering, like 90 bucks to Florida, Hawaii, etc....fares as low as 20 dollars.... :o :o :o I gotta tale a look at this, at that price it makes a long weekend doable.... :) |
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Title: Re: Killer deals..... Post by justin_o_guy2 on 03/05/20 at 17:48:14 Yeah , go climb into a tube full of strangers who have to share air.. |
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Title: Re: Killer deals..... Post by raydawg on 03/05/20 at 18:31:05 76696F6875724373437B69652E1C0 wrote:
Oh hush up.....scary cat ;D ;D ;D ;D |
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Title: Re: Killer deals..... Post by Papa Bear on 03/06/20 at 12:22:39 Ray: Is the air inside a jetliner exhausted or recirculated ? Bob |
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Title: Re: Killer deals..... Post by raydawg on 03/06/20 at 13:07:53 Recirculated, and the pilots get the good stuff first ;D ;D ;D ;D The system I know of are HEPA and rejuvenating. Which means it cleans it to very safe condition, not pure, what is....? Its as safe as any mall, restaurant, theater, hospital, bus/subway, etc.... and certainly more so than any exhale from a DC or Hollywood liberal ;D ;D ;D ;D ;D Its the firsthand contact/exposure that gets you, be it whatever transmissible virus, disease, is present. Guys...remember the scare about AIDS...... Ignorance just breeds more of the same. |
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Title: Re: Killer deals..... Post by Papa Bear on 03/06/20 at 14:29:02 Thanks, Ray. Good luck to us all. :-/ |
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Title: Re: Killer deals..... Post by pg on 03/07/20 at 17:03:03 7D6E766B6E78680F0 wrote:
How are the planes filter and or clean the air? Best regards, |
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Title: Re: Killer deals..... Post by raydawg on 03/07/20 at 20:02:27 Here it is, I help build the 787, tho I was only working the wings, and doing some non-conforming work, it never took me inside the tube, or cabin.... I C&P'd this ;) Ensuring all passengers get fresh, comfortable cabin air is understandably complex. But airplane manufacturers have spent decades mastering the science. Planes fly in conditions that are inhospitable to life. Outside temperatures can vary from -68º Fahrenheit to as low as -85º Fahrenheit. Outside the aircraft, pressure at 35,000 feet is only 3.47 pounds per square inch of absolute pressure (PSIA), compared to 14.67 PSIA on the ground. Boeing’s Dr. David R. Space, an associate technical fellow in the Boeing Commercial Airplanes Environmental Controls Systems group, explained that aircraft air systems are designed to keep cabin pressure at a suitable level for humans, while ensuring that the air we breathe is fresh and that the temperature is comfortable. These processes are interrelated. Cycling air through the cabin builds the pressure we need. Airplanes work on a 50/50 share of internal and external air, and the air is never static. “The outside air portion comes into compressors and is compressed to a density which makes the oxygen safe to breathe," Space told Travel + Leisure. "That process makes the air hot, so it has to be cooled. The air then flows into a big chamber called a mixing manifold, where it’s mixed with recirculated air from the cabin, after that cabin air has been through a specialized HEPA (high efficiency particulate air) filter. The mixed air then travels through air ducts on the plane, from back to front, and to connecting ducts, where the ceiling meets the sideboard. At the same time, air leaves the cabin through return air grills, where the cabin meets the floor. Half of the cabin air is dumped overboard, keeping a continuous flow of air.” As Space explained, the rate at which the air is dumped creates pressure in the cabin. The exchange rate of air in the cabin is higher than most other environments, like our home, office, or most other public spaces. “There are between 12 to15 air changes in an hour and 25 to 30 cycles through a HEPA filter,” he said. The filters used to clean airplane air are of the same quality used in operating rooms. These HEPA filters can capture very small particles, including the majority of viruses and bacteria. The outside air is naturally sterile, because of the atmospheric conditions at altitude. Cabin air management systems are even more sophisticated on modern aircraft, like the 787 Dreamliner, where the pressure is lowered to equal 6,000 feet of altitude. That’s a far more comfortable 11.78 PSIA, which also helps alleviate the fatigue we feel from flying. When designing the air system for the Dreamliner, Boeing worked with the Technical University of Denmark, one of the world’s top institutions for the study of air quality, to find the best way to “scrub the air” onboard while avoiding irritation to eyes and the respiratory system. Keeping a comfortable temperature in the cabin depends on a number of factors, and is managed automatically by aircraft systems. Temperature and humidity are largely affected by the number of people on the plane. Bodies emit heat and humidity, so the more crowded a cabin is, the more the aircraft air management system has to adjust for those factors. Outside factors, like the amount of light coming through cabin windows, or if the aircraft was parked in the sun before take-off, also affect initial cabin air temperature. Flight crew calibrate the aircraft for the number of passengers onboard each flight, ensuring that the air management system can accurately calculate the temperature requirements for each zone of the plane, based on occupancy. Pilots can also control these systems in-flight, but Space noted that they very rarely do. That’s because changing the overall temperature setting could make some onboard less comfortable. The cabin air management systems are programmed to naturally balance cabin air temperature. These systems are also designed to deal with a challenge that is unique to airplanes. Most passengers are sedentary in-flight, which means they have a lower metabolic rate, and are more likely to feel cold. Flight attendants, however, are working constantly, pushing carts back and forth, for example, which is likely to raise their body temperature during the flight. To adjust for these two extremes, air blows through the aisles first, giving flight attendants cooler air, while avoiding a draft across the cabin and keeping passengers comfortable. Of course, certain individuals may be more prone to feeling warm or cold, which is why we get those handy overhead nozzles. The air coming through overhead air vents is the same purified air distributed to the rest of the plane — but the nozzles have special boosters which help increase the individual airflow. In effect, they are mini-fans, which do incredible work to ensure every passenger has a pleasant flight. |
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Title: Re: Killer deals..... Post by GearHead on 03/16/20 at 05:11:18 Lean something new every day |
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Title: Re: Killer deals..... Post by GearHead on 03/16/20 at 05:11:31 Learn something new every day |
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Title: Re: Killer deals..... Post by WebsterMark on 03/16/20 at 05:54:47 You've ventured into my area of expertise... Yes, most commercial airliners are outfitted with HEPA filters and use a combination of recirculated air mixed with fresh air. However, and this is the unfortunate part, air filtration will have very little impact as far as limiting the spread of infections. Viruses are extremely small, this virus causing COVID19 is on the order of .002 microns. It's name is SARS-CoV-2. Planes use HEPA filter rated at 99.97% efficient on .3 micron particles. Some quick math tells you a HEPA won't stop a virus. And that's true, it won't. You'd need an ULPA which is 99.9995 at MPPS (most penetrating particles size) and even then it's problematic. Here's the crux of the matter. The virus does not float around in the air on its own. Its encapsulated in the respiratory droplets expelled by an infected person. These droplets contain the virus. They are relatively large, in fact from an air filtration point of view, they are boulders, planets, easily captured. However, when you cough or sneeze droplets full of virus, they are heavy and sink which is why WHO and CDC have the 3-6 foot zone. It's true, some droplets can be very small, 1 micron or so. These can drift and remain suspended for over an hour. These are the troublesome ones from an air filtration point of view. The return air ducts don't have an opportunity to draw every single floating droplets in and through the filter before it eventually settles on your eyes, lips, or you inhale it. It also settles on a tray table, seat etc and then you wipe your hand across it and touch your mouth, eyes, nose or whatever. If you could run every droplet past a filter, you wouldn't necessarily even need a HEPA filter, but you can't get them all to a filter. That's why the distancing recommendation is critical. That's why one sick person on a plane can infect many. Filters have very, very little to do with it. They never even get the opportunity. |
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Title: Re: Killer deals..... Post by WebsterMark on 03/17/20 at 05:20:39 Also, saw something else about this today and reminded me, this is the same basic flow your house has. If you or someone else in your house is infected and they cough, most of the droplets are going to fall nearby, (hence the 6’ rule) but a few will drift. It’s unlikely these will get caught up in your return air ducts but even if they do, your home air filters are almost certainly cheap and very inadequate; they won’t catch a small respiratory droplets. One possible solution is one of those small room air purifiers with a filter. A lot of them say they’re HEPA filters but most of them are not but even still they will have some effectiveness on the small droplets that drift outside that 6 foot zone. I have one running next to my bed every night and another in my mancave runs all the time. From a big picture point of you, if you want to keep the air in your house cleaner, run the fan in your HVAC system 24/7. Let that air constantly recirculate through a filter. Also, get a decent filter. That’s the best thing you can do to keep air in your house clean. Of course, open the darn windows now and then, as long as you don’t live in a $hitho!e industrial part of town. |
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