An Evaportive Air Conditioning Question?
928091
In general the temperature of the water has very little impact on the temperature reduction due to evaporative cooling.\n\nAs to how cool you can get the air. If you have sufficient contact between the air and water, you should be able to approach the wet bulb temperature of the air but since the contact is not 100% efficient you will never reach the wet bulb temperature.\n\nI don't have a chart handy but you should be able to determine the wet bulb temperature that corresponds to 23% humidity.
721426
OBVIOUSLY the 46 is 46C not 46 F!!!!!!!!!!!!!!!!! And I would think that an AC is for some reason unavailable. Without an AC you will have to try to minimize the amount of heat transfer coming into your apartment. Since you are in the top floor the radiant heat from the sun is the biggest factor. The best way would be to set up a mirror on your roof but you probably don’t have one that size so try spreading out a few rolls of aluminum foil. Try to cover as much area as you possibly can. This will reflect most of the radiant heat from the sun. Construct a shade over your windows such that the direct rays of the sun do not come into your apartment. You may want to get a fan and try to take advantage of the principle of evaporative cooling. Depending on the humidity it will be an very effective method of keeping cool. Use the fan instead of depending on the breeze. If you cant get a fan do as instructed above wet your WHITE curtains.
1129624
Run the AC.  It might not costs as much as you think.  Close all the windows, check for air leaks around doors and windows.  If you find air leaks have the landlord fix them.  If he wont then you fix them with supplies from your local hardware store.  (you can deduct the cost from your rent if you show a receipt)  Also turning off lights makes it seem cooler in the house.
544081
ok remember that freon or r134 are used in AC but is not like it is a substance that stays cold... you to compress it in order to make it liquid and then it absorves heat and evaporates completing the cycle... if you are looking for a sort of system that will make something stay cool.. .hmmm man it is called Air Conditioned
794340
Q: What common product, used widely in homes and cars, was banned due to its impact upon the ozone layer?\n\nA: Freon
301282
decreasing the heat to avoid degredation of the PVC
561115
Question -   Please explain how molecules in the air cause air\nresistance. Why air resistance is larger when a car a travelling faster?\n---------------------\nSharazaad,\n\nEven though you cannot see them, air molecules (a mixture of gases, mainly nitrogen and oxygen) are \njust like all other molecules inasmuch as they have mass and occupy space. Anything moving through \nair must push the molecules out of the way.\n\nThe faster the object moves, the faster the air molecules are encountered and the greater are the \nnumber to be pushed aside. This requires a larger force that necessary when the object is moving \nslowly. Consider swimming: The faster you swim, the harder it is to push the water molecules out \nof the way.\n\nStreamlining a car is a way of making it slip through the air more easily. Cars with narrow or \nwedge-shaped front ends and smooth, gentle curves allow it to slip through the air more easily \nthan bulky things like large trucks with large, boxy, flat front ends. Even something so simple \nas keeping a car clean and polished will help it slip through the air more easily.\n\nRegards,\nProfHoff 869\n=====================================================\nSharazaad,\n\n\nMolecules in the air have mass.  Even though they are invisible, they are\nstill there, and they still have to be pushed out of the way for a car to\noccupy the space that the air is in.  This now should make sense WHY air\nresistance even exists.\n\nNOW.  Why do greater speeds cause there to be an even greater air\nresistance.  It is true that there is barely any appreciable air resistance\nto a car going 10 MPH versus 60 MPH.  But at 60 MPH, even though there is\nthe same amount of air, the resistance is much greater because the car needs\nto move the air out of the way MUCH MUCH QUICKER.  I do not know if you can\nreally speak about viscosity of air (non - liquid).  But air really does\nbehave like a liquid when it comes to resistance.  HOW?  The air that is\nexisting on or above the sidewalk WILL ALSO RESIST the air molecule that is\nbeing struck by your car and pushed to the side.  SO, this is why at higher\nspeeds you will have a much greater resistance because you are FORCING THE\nAIR to move not at 10 MPH but NEEDING IT to move out of the way at 60 MPH.\n\nYou could say that the relationship between air resistance (r) and velocity\n(v) is proportional.  However, I think I read somewhere that resistance (r)\nis ~ velocity (v)^1.5\n\nPlease do not quote me on that ... but I am pretty certain I read it in an\nMath book for Engineers.  So there may be some credence to it.\n\nHope this helps.\nDarin Wagner\n=====================================================\nAir resistance is caused by the car banging into air molecules and\nincreasing their momentum in the direction the car is going.  Since the car\nexerts a forward directed force on the molecule, by Newton's 2nd law (for\nevery action there is an equal and opposite reaction) the molecule exerts a\nforce on the car in the backward direction, tending to slow the car.\n\n\nOf course, a molecule has so little mass, it exerts an extremely tiny force\non the car.  However, there are so many molecules that the cumulative effect\ncan be large.  You might also imagine what would happen if molecules were as\nlarge as bowling balls!  I think you can picture how the forces could be\nvery large.\n\n\nIncidentally, the molecules are moving at speeds much faster than the car is\ngoing and in random directions.  So some hit the car from the rear and speed\nit up a little (very little).  However, one coming from the front slows the\ncar down by a larger amount because the car's speed is added to the\nmolecule's speed for a molecule coming from the front and subtracted from\nthe molecule's speed for one coming from the rear.\n\n\nBest, Dick Plano, Professor of Physics emeritus, Rutgers University\n=====================================================\nHi Sharazaad,\n\nGood question,
1139671
Is he stupid?  Please show him this question and all the answers saying he an idiot.  Air conditioners run based on how hot it is inside the building and if you are constantly letting more heat into your building, the air conditioner will keep running.  Not only is that a huge waste of money, but it also doesn't effectively cool the building.
629048
i dont think so, when a gas condenses, it gives heat to the surrounding air
1141687
Basically, heat is absorbed from the hot room by a refrigerant liquid which expands into a gas.  When things expand, they absorb heat, so this cools the room.  The gas then goes to a compressor, which squishes it back into a liquid.  It only has to increase the pressure (the temperature goes up too), and send it to a set of coils outside.  The room heat, plus the heat from the compressor is lost to the atmosphere.  You then have a cool liquid to send back to the room coils.\n\nok.  You've moved a lot of heat around, but you only had to do a bit of compression and pumping.  You put in a little work, and got a lot of cooling out of it.  We have a measure of this, called the coefficient of performance, or COP.  In this case 3500/1500 is about a 2.3, which isn't all that great.  3500/800 is about 4, which is a little better.  Try for more like 5 to 7.\n\nA more thorough explanation would require some thermodynamic charts.  You might want to look up the air conditioning cycle using your favorite search engine.  It will take a bit to understand the whole thing.  If you are really interested in this, I would recommend a nice four year course in engineering.
545704
Well, get out your heat transfer text book and start calculating. You should have all the info you should need.
996021
A few suggestions.  Check the website of the who made the air unit you have and see if their site has the info you need.  Check also this website --> http://home.howstuffworks.com/ac.htm  for a wealth of information that the web has.
452060
One must ask what is the air volume of the structure in Cu Ft (or Cu M) then determine what the volume of exhaust gasses are to be expected that remain within safe concentrations versus the total volume of exhaust gas versus total structure volume, then determine how often the total air mass is to be exchanged to maintain said safe consentrations.\n\nJust a guess.
980435
Your friend is delusional.\n\nA thermometer and two similar rooms is all you'll need - or, just one room and two thermometers. \n\nThe thermometer under the fan will indicate room temperature - say, 70 degrees - the one in front of the Air Conditioner will indicate approx. 38-40 degrees F.\n\nThere's a valid reason why central air conditioners are so prevalent in the hotter portions of our country.
535458
good question...the term air conditioning refers to conditioning of air..irrespective of outside temp..i.e. when u want to cool ur room in hot climate and heat ur room in cold climate...\nrefer the site: www.marineengineering.org.uk     and go to main page and select utilities and the refrigeration and air conditioning systems both diagram and formulaes...
334098
Hot air *can* contain more moisture than cold air, but it depends on how much moisture is available for it to contain.
1059988
http://www.oreck.com/air-purifiers/air8.cfm\nthis one is great