08.05.2014

30cm floor fan walmart,small corner ceiling fan joke,victorian ceiling fan light kits yamaha,ceiling fan retrofit kit e90 - PDF Review

Author: admin  //  Category: Exterior Ceiling Fans


You must have JavaScript enabled in your browser to utilize the functionality of this website. The Agro-Fan Floor fan is a high recirculation fan with sturdy steel frame, full metal with three operating levels. The steadfast rotating fan has been employed to keep people cool since the eighteenth century, and it remains highly effective, requiring much less energy and providing more comfort than air-conditioning. If used in combination with air-conditioning, fans could lower energy use by 30-70%, even in incredibly hot climates or during heat waves. Compressor-based cooling or air-conditioning (AC) puts increasing pressure on electric grids worldwide.
Except for the few temperate regions on the West Coast, air conditioners are now standard in most American homes.
While the USA remains the absolute champion of air-conditioning, the technology is also gaining importance in the rest of the world.
Throughout history, humans have used energy to keep themselves warm during the winter months. The first remotely operated fans were “pankha” or “punkah”, developed in the 1500s in India and the Middle East.
Rotating fans appeared in the eighteenth century, and these were initially human-powered, too.
The four environmental factors that determine human thermal comfort are air temperature, air velocity, air humidity, and radiant temperature. Radiant cooling -- another method of keeping humans comfortable -- works by lowering the temperature of the surfaces in a space. Air-conditioning is the least energy efficient way of cooling people, because it implies that all the air in an enclosed space needs to be refrigerated (and, if necessary, dehumidified) in order to cool the occupants. Moreover, the cooling effect of circulating fans can be applied locally and has immediate effect.
Like circulating fans, radiant cooling is much more efficient than air-conditioning, because there is no need to refrigerate the air. Another disadvantage of air-conditioning is that it requires an airtight, enclosed space in order to keep the refrigerated air inside. Ceiling fans produce the least cooling for a given air speed, as they affect a smaller part of the body. In recent years, several studies have calculated the cooling effect of different fan configurations at various air velocities and relative humidities. Both studies also found that none of the subjects complained about noise or dry eyes as a consequence of the use of fans.
Circulating fans can save large amounts of energy, either by lowering the energy use of air-conditioning, or by completely obviating the need for it. The 126 cm diameter Aeratron E503, one of the ceiling fans tested, consumes only 4-8 watts for normal range of use.
The new generation of fans with DC motors and magnetically levitated bearings have remarkably low energy consumption.
An additional benefit of the low energy use of these fans is that they can be easily operated via battery power during blackouts. In more moderate climates, the use of circulating fans in combination with natural ventilation or radiant cooling systems could easily allow people to get rid of AC altogether. Fans also work well alongside slow acting radiant cooling systems, because they can provide instant comfort in anticipation of the radiant cooling coming on stream, shortening pre-cooling times. Despite this limitation, fans remain extremely useful at temperatures above 35°C (95°F), because they can be used in conjunction with air-conditioning. Unlike air conditioning, fans can produce different thermal environments in a single space.
Fortunately, these comfort standards have come increasingly under fire in recent years, as more and more studies show that higher air speeds can have a welcome cooling effect during the warm months. In ASHRAE 55-2013, which was presented less than a year ago, a further step was taken by defining air speed not as a single-point maximum speed but as the “average air speed”, being the average air speed at ankle, midbody, and neck level.
Traditional buildings in hot climates kept solar radiation out by using heavy construction materials, big eaves, reflective tin roofs, and growing shade trees around the house. Modern thermal underclothing offers the possibility to turn the thermostat much lower without sacrificing comfort or sex appeal. Architecture could be better, but often will have higher embedded energy costs, and of course it'd be expensive to simply replace what we have, flawed as it is.
A couple of other features that KdK didn't specifically mention but also problem with AC, is the *noise*.
Another issue that AC causes was a study I read that looked at how AC affects people physically.
In all the climates where you need to heat in winter, cooling in summer can help reduce the winter energy bill. In the same way and with the same equipment (if it has been set up for that mode), you can cool the house in summer. In my own house (24 apartments) we have a forced ventilation system with central heat pump unit for energy recovery in winter.
3) longer periods of light sweating that is evaporated leave the body with a salty sticky coat, which is uncomfortable and dirt in some sense.
4) silly as this might appear to be, hot air + wind + light evaporated sweat is bad for makeup on women and for hairstyles that involve anything besides natural form.
5) 80% humidity is a bad environment for computers, other electronics and furniture to being with. 6) the air flow on the experiment chamber is much higher than what is usually found on office buildings. One drawback of fans not mentioned in the article is the noise they generate, even if it is low level.
Indeed, the fans in the tests (which are also pictured in the article above) are the newest generation of fans with higher efficiency and lower noise generation than the average fan of yesteryear.
1) Your point is only valid for men, not for women, and to your information women are also to be found in offices in the western developed world. The main victims of overcooling in offices are women, because they usually wear appropriate clothes in summer -- open shoes and clothes that expose more skin to the environment than just the hands and the face.
By the way, fans bring large energy savings even in combination with the typical business suit of 1 clo insulation.
3) Could you tell me where in the study you found a reference to "light sweating"?
5) Since computers and other office equipment are usually tossed away after three years or so, most devices will work just fine during the operational life, even at 80% humidity.
6) The study describes how in all experiments perceived air quality greatly increased with the use of fans compared to AC. On a side note, us being so productive is probably one the main causes of resource depletion and other evils.
He lets moisture into house at the lower level, moisture evaporates and absorbs heat, at the higher level is extractor which throws out humid air.
Fair enough it has its uses in very hot countries as you have pointed out, but for example here in the UK we have it in our office, it is probably on about 6 months per year and centrally controlled so there is no getting away from it. Apologies for the strong words but I would be happy to see the back of AC altogether, in the UK at least!


This is all very well, but there are plenty of people who cannot tolerate ceiling fans at all. Peak demand can be reduced by adding a level of indirection: Cool water and store it for later use. As a final step before posting your comment, enter the letters and numbers you see in the image below.
Thanks to the solid metal construction, the Agro-Fan Floor fan offers an excellent standing stability. Cooling people by increasing local airflow is at least ten times more energy efficient than refrigerating the air in a given space, and it also adds the benefit of a personally controlled thermal environment. Circulating fans, which have become very energy efficient in their design, can be readily and cheaply applied in both new and existing buildings. In the USA, the birthplace of the technology, AC accounts for approximately 20% of year-round electricity consumption by American households, and 15% of total electricity use. Obviously, the use of AC is not spread equally throughout the year, but concentrated in the summer months.
For example, between 1997 and 2007, the number of Chinese households owning air-conditioning tripled, with the annual number sold reaching more than 20 million.
Hand-held fans were used by ancient Egyptians, Babylonians, Persians, Chinese, Greeks and Romans. These rectangular canvas covered frames, suspended overhead, were waved back and forth by servants (called “pankwallah” or “punkawallah”), who pulled a rope against a counterweight while seated outside the room.
A lower air temperature increases heat loss from the body through convection, while a lower air humidity increases heat loss from the body through evaporation of moisture from the skin (which also occurs when we are not sweating).
This is achieved by circulating cool water through plastic tubes in building surfaces, such as walls, floors, ceilings, or in modular panels. The larger the space and the fewer the people within it, the more energy it will take to cool each occupant.
Fans circulate air around the body, while leaving the air in unoccupied parts of the space unaffected. Furthermore, radiation is often the primary method of heat exchange between the body and the indoor environment. Circulating fans and radiant cooling systems, on the other hand, work indoors as well as outdoors. However, they have other advantages: they don't require floor or desk space and they can have very large diameters, which enables them to cool a larger area. For every rise in degree celsius above 25°C (77°F) in the thermostat setting in summer, a cooling energy saving of between 9 and 12% can be achieved (5% per degree F). In the earlier mentioned study, thermal comfort up to 30°C (86°F) could be provided by fans using less than 10 watts, increasing energy savings up to 70%. While natural ventilation can be very effective in a well-designed building, obviating the need for fans during most of the year, its effectiveness is dependent on outside wind conditions. Unfortunately, there is a fundamental limit to the cooling effect of circulating fans: they can only provide cooling at air temperatures below the mean skin temperature, which is about 35°C (95°F). This can be solved by paper weights, or by locating fans below the desks, aimed at the midriff. The main difference between air conditioning and circulating fans is that AC subjects all people in a space to the same thermal environment, while fans allow the creation of personal microclimates.
If people have personal fans at their desks, they have control over their own thermal environment, greatly improving their relative comfort.
This allows the fan system to include higher maximum local airspeeds in the occupied zone, since flows from fans are rarely equally high at all three levels.
While a renewed interest in circulating fans could save large amounts of energy when cooling buildings, there are limits to what can be achieved because the widespread use of AC has had a profound influence on architecture. Air conditioning did away with all these building elements and stimulated the use of lighter and cheaper building materials. The skin is cooled partly due to the evaporation of sweat (which coincidentally is similar to how aircon cools air by evaporating a coolant). Really, Our AC unit sits in a small enclosed room which is a TV room(I dont use it often), but when unit cycles, as it does constantly, its like a jet engine.
The heat pump is turned off in summers, but it is amazing how even the moderate airflow of the ventilation system makes you more comfortable. This is positive for the experiment (facilitate creation of each controlled atmosphere), but it also increases the comfort of those in the chamber compared to the sticky and smelly air that would be created in an office full of people with their own smell-production and chemicals mixing up on a high-humidity environment with much more stagnant air. The noise makes it very difficult for me to fall asleep in a room with a fan, and I'm probably not alone. The fact that men in offices wear inappropriate summer clothing (and usually are in charge) explains in large part the phenomenon of overcooling. And the thought that people should subordinate themselves to AC for the benefit of office tools, strikes me as far-fetched.
In the Berkeley study, the researchers note this as one of the topics for further research. I do not desire to take heaters and AC for granted, and I do want AC during the hottest days of the year and heat during the coldest nights of the year. The beating motion of the blades is a migraine and seizure trigger, particularly bad when there's lighting behind the fan or even just nearby. On very hot days, many air-conditioning units are set to a maximum position, and as a consequence demand for electricity spikes. There is also the leakage of refrigerants, which are gases that -- although they remain in the atmosphere for a shorter time -- have a much higher global warming potential than CO2. Before the advent of air-conditioning in the first half of the twentieth century, buildings in hot climates were designed for natural ventilation (see further), and people adapted to the heat by changing their routines. Most often, fans were waved by servants in order to cool their masters and to scare away insects. In the nineteenth century, fans were powered by waterwheels, steam engines, or small water turbines running on tap water from the town mains. Circulating fans increase air velocity, which accelerates heat loss from the skin through convection and evaporation. Radiant systems cool people by increasing heat loss from the body through radiation, but there is also an indirect, limited, and delayed decrease of air temperature. Like air-conditioning, circulating fans cool people by encouraging heat loss from the body through convection and evaporation.
They can be combined with natural ventilation, taking advantage of an additional, free cooling effect when it is available. Floor fans aimed at the back or the chest provide the most cooling, while the cooling effect of desk fans sits in between these extremes – the face appears to be very sensitive to the cooling effect of air movement.
At 60% relative humidity, subjects would be comfortable at temperatures higher than 30°C, but these conditions were not investigated. However, the maximum air speed of the floor fans was not sufficient to deliver thermal comfort at 30°C and 80% relative humidity, in which case only 60% of subjects felt comfortable (comfort standards require at least 80% of people to be comfortable in a given condition). It must be noted, however, that these studies did not ask the subjects about possible discomfort due to noise or dry eyes. Fans cannot cool people above that treshold, because moving air cannot reduce the skin temperature below the ambient temperature – no matter how high the air speed.
When used in tandem, the energy savings during heat waves would be around 50% compared to using AC alone.


People react differently to similar temperatures, and have different clothing and activity levels. Studies also show that circulating fans can significantly improve people's perceived air quality, possibly by disrupting the body's naturally-occuring thermal plume through which body odours and skin bioeffluents are carried to the breathing zone. Before the advent of air-conditioning, buildings in hot climates were designed in such a way that they were comfortable during summer months without the use of energy. Office blocks with H, T, and L-shaped footprints, which facilitated cross-ventilation, were replaced by massive, square blocks with very deep floor plans. This could happen with warm air too, in a similar way to how gas fridges burn gas to evaporate a coolant and cool down.
Whether your watching the idiot box or even if you wanted to a read a book-you cant-not in that room.
The reason being, humans respond to cold temperatures by wanting to eat more-to store up food, whereas warm temperatures tend to have the opposite effect, and suppress the urge to eat endlessly. Most run on air temperature exchange for their ventilation system, but more than just a few are using the ground as a heat buffer. Cooling in summer will pump heat energy into the ground, which you can harvest back in winter, and vice versa. Granted, AC units generate even more noise, but they are usually not adjacent to or in bedrooms. Japan has successfully lowered AC energy use in offices by promoting more appropriate summer clothing. By the way, if you read the study, you must have noticed that it includes several experiments in real office buildings, not just in climate chambers. They expect fans to have a positive influence on productivity, just like AC, but this has not been studied yet. Not very productive I guess, but we have the highest life expectancy and one of the happiest populations in Europe. The system could be improved to make more natural flow of moisture and air, hopefully eliminating the need for any extra energy input. What I am saying is, I consider my external temperature range to be around the 65 to 75 degree range in Fahrenheit. Part of the increase in energy use is due to the switch from window units (which cool one room) to central air-conditioning (which cool the whole building), and in part to the growing cubic footage of houses and apartments.
Hundreds of American power plants and a great many miles of transmission and distribution lines are needed on average only two or three days per year, while they sit idle for the rest of the time. The irony is that the substantial greenhouse gas emissions from air-conditioning bring us hotter summers, which in turn stimulates the use of air-conditioning.
However, air-conditioning was not the first technology that used energy for cooling: circulating fans predate AC by decades. The folding fan, which people used to cool themselves, was invented by the Japanese in the ninth century, and introduced to the west by Portuguese sailors during the Renaissance. However, unlike air-conditioning, moving air around requires much less energy than refrigerating it. Firstly, like air-conditioning, it's slow acting, which means that it needs to be operated continuously in order to offer immediate comfort.
Both cooling systems appear in nature: wind is the natural counterpart of a fan, while cold surfaces such as those of seas, lakes, or caves are the counterparts of radiant cooling surfaces in a building. During the experiment, which took place in a climate chamber, subjects were wearing light clothing (0.5 clo) and performed light activity (for example, computer work at a desk). The researchers concluded that increasing the maximum air speed could further improve the results. For ceiling fans running at high speeds, energy use is approximately 2% of the air conditioning savings, leaving net savings from between 7-10% for every degree celsius of thermostat rise. Furthermore, not all occupants might be close enough to a window to enjoy the cooling effect of natural ventilation. The fact that air speed was limited to the same level in summer, however, can only be explained by the fact that American comfort standards are written by the national branch organisation of the air cooling and heating industry (ASHRAE), protecting and promoting its own products. They encouraged natural ventilation by, among other things, large porches, high ceilings, roof vents, sash windows, ventilation shafts, transoms over interior doors, and courtyards. Completely new building types emerged, such as office towers with fully glazed facades or enclosed shopping centres, which would be simply uninhabitable without air-conditioning because of the greenhouse effect.
I think you're right though, as this happens on a small scale unless you apply more water to your skin.
He runs it constantly and obsessed over single digit changes to the temp reported by the thermostat. Peak power demand is growing faster than average power demand, and compressor-based cooling is an important reason for this.
Another feedback loop is the “heat-canyon effect”: by blowing warm air out from buildings, AC heats up the streets, in its turn raising the need for more AC. For example, in the UK, based on currents trends, 40% of commercial floor space will have AC by 2020, compared to 10% in 1994. Secondly, it's considerably more expensive than fans and it's not as easy to install in existing buildings.
Fan configuration is another important variable, because the airflow from fans usually reaches only certain parts of the body surface. In offices, this problem is often exacerbated by the tendency to overcool the building, forcing some people to wear thick sweaters or even use electric heaters while outside temperatures are well above 30°C (86°F). While fans could somewhat lower the energy use of air-conditioning in such buildings, energy consumption would remain very high.
The exterior vents are so loud it reminds of the noise levels I am exposed to biking on the highway(No choice in that matter either). Our other condo has no AC and I remember clearly in the summer, our meals were small, light and everyone lost weight and on no one was constantly munching all the time. As a consequence, a space will often be air-conditioned even when nobody is around, in order to provide immediate comfort when somebody enters it.
Now hes the type of individual you cant say anything to, but once in a while, I am able to point out that humans will not melt into puddles of shapeless wax about 75F-files right over his head. In the current structure, with the AC going full tilt-its big meals constantly and I am always fighting down the (unnecessary) urge to snack and feed my face-as it were.
I often wonder what they do when AC is no longer widely available, melt?, die of heat stroke at 85F? Naturally the end goal of all this, was to return to an AC'd box as quickly as possible. If I stayed indoors all summer, Not only would would get nowhere-but I would also become (physiologically) dependant on artificial cooling-which is what I see happening in my own household-its bizarre to watch really. I dont if anyone has seen this, but I find, some peoples reaction to NOT being AC'd akin to withdrawal symptoms.



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