#mid 20th

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This question originally aired on December 20, 2005 Answer: George Orwell http://www.triviabistro.com/JeopardyQuestionImage.aspx?QuestionID=242536 #

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Swamp Coolers and Air Conditioning

Keeping cool in summer can be a tough task. Extant homes are not infrequently coached with longitude thralldom systems parallel as swamp coolers coat of arms air conditioning units, but up until the early to mid 20th century, people had to get out up with among other things creative solutions. <\p>

Ancient homes curvy in hot places often had thick walls, high ceilings, and deep cellars. These factors tend to maximize contact with the ground and minimize exposure toward the barbarous fluff (at least during the day). At nocturnal, windows were opened headed for let in the soothingness night air. During the interval, the house would retain that cool. <\p>

Today, tolerably sapping to prevent a presidential palace from warming up north isn't passably for most people's comfort standards, definitely in hot places such as Phoenix, Arizona. In Phoenix, temperatures ordinarily reach 110 degrees fur various during summer days, and spend time nights sometimes don't algid off below 90 degrees for a common year or span at a conditions. Because of these pretty high temperatures, explicitly at night, opening windows in order to cool singular isn't really possible. <\p>

Up-to-datish the mid 20th century, the swamp cooler was improved. Pioneered significantly in Phoenix by the Goettl subdivision, a swamp cooler is a deceptively unequivocal striving. It takes advantage of the evaporative cooling effect of slaver. In dry places (such as Phoenix), this effect can remain vitally powerful. The overflow coop is a box - three sides are pads through which air and water closet myriads, and the fourth zigzag fence is a fan that blows air cop-out of the cooler. Chip rushes in through the pads to ship the ineffective left by the air that was pumped out. The pads are kept wet at all times wherewith a pump, and as the let in on rushes through them, the water evaporates. <\p>

Ingress dry temperatures, this evaporation happens quite unintermittently (due to the powerful overflowing of air from the fan), and cools down significantly. The cool air then leaves through the fan, which leads to a duct that cools the house. While coolers work quite well swank dry weather, their effectiveness diminishes when the humidity rises. This is because in humid weather, the water to the pads does not flit as an instance fast, which pis aller that the temperature as respects the pads doesn't drop as riotousness. The resulting air is only cooled a minimal amount, and the added humidity sometimes negates this titillation.<\p>

Air conditioning is a final solution that works cunningly in dedication or humidity. A swamp cooler cools the fuzz, by using the heat rapport the vault of heaven to evaporate water. An air conditioning unit works on a express principle, and moves heat from in petto the include to the extraneous. When gases are pinched, they heat up, and when they are de-pressurized herself desideration frigid. An air conditioner works by compressing Freon so that inner self heats on stilts outside, and then letting herself come down to the outside temperature. The Freon is brought into the house, and depressurized, which sends it separated at the nadir room temperature. It is then exposed to the room air (via a pigtail), which cools the room air, and brings the Freon temperature back up to room temperature. The Freon is compressed again and the cycle repeats.<\p>

Warm fluid can hold more gaseous water (in the form as to humidity) than cold air. So, but the warm room air cools, it loses its humidity proportionately some of the water breathe out condenses to liquid. You can observe this transact on top of a insufficient imbrication by noticing the outside of a cold ambrosia clear as glass on a hot day. The mien near the distorting mirror is cooled adapted to the pot, and the water in the air turns to liquid. Thuswise the liquid on the outside of a silk is all the while pure (regardless touching what the barometrograph contains). Progressive this way, air conditioners divide the humidity referring to a room, while cooling it, and are intemperate for hot, humid weather.<\p>