There are four mechanisms through which our body can cool down: evaporation, convection, conduction, and radiation. The ceiling fans favor the first two, which together may represent 30% or 40% loss of body heat. The rest is lost mainly by radiation.
Evaporation occurs through respiration and perspiration or sweating of the skin: the water evaporates and to do so it needs to absorb heat from our body, which cools during the process. On the other hand, convection occurs when hot air, in contact with the skin, is replaced by a colder air mass. This happens naturally in a room. For example, when hot air rises to the ceiling – because it is less dense – and once it cools back down to the ground. Keep reading: Benefits of beer | Does Beer Help Lower Cholesterol?
Ceiling fans in summer
The environmental parameters that influence these processes are:
- The relative humidity of the air, which directly affects the evaporation capacity. The more saturated the humidity air is, the more difficult it is to evaporate moisture or sweat from the skin.
- Ambient temperature.
- Airspeed. A stream of air helps both the evaporation process and the convection process.
As you may have guessed, a ceiling fan decisively influences the third point. The sensation of cold that we notice when there is a breeze of air, whether in winter or summer, is what is known in English as ” windchill effect ” (cold effect by breeze). A current of air on our skin favors evaporation, and therefore the loss of heat. This phenomenon, which is unpleasant and even dangerous in winter – at very low temperatures can cause freezing – produces a pleasant sensation of freshness in summer, where we can notice a sensation of a temperature drop of up to 4º C.
From the above, we can see that a ceiling fan does not cool the air, but acts on people (and pets). Therefore, it does not make sense to leave a ceiling fan plugged into an empty room. On the contrary, the fan motor will heat the environment, without any benefit.
On the other hand, several studies have been carried out, studying the effect of different breeze intensities on people at different ambient temperatures. His conclusion is that ceiling fans are a very effective and economical method of climate control in environments with warm temperatures -up to 30º C- and a relative humidity of up to 80%. They refresh without causing dryness or annoying air currents. Above 30º C, the breeze needed to refresh is excessive and uncomfortable. It is, then, from this temperature, when it is recommended that the ceiling fan works in conjunction with an air conditioner.
Advantages of ceiling fans
The main benefits of using a ceiling fan are the following:
- Economical: The consumption of a ceiling fan is very low, between 20W and 60W normally, depending on the speed.
- Also, the new fans with direct current AC motor consume only between 3W and 30W. If they are used in conjunction with air conditioning or heating, they can significantly reduce their energy consumption.
- Healthy: A ceiling fan does not cause dry throat or eyes, or colds due to excessively cold drafts.
- Easy to install: Its installation is also relatively simple and cheap. It only requires a sufficiently high and resistant roof and an electrical outlet.
- They drive away flies and mosquitoes: The current of air generated by a ceiling fan disturbs flying insects.
- Decorative: Currently, there is a very wide range of ceiling fan designs. From the most classic to ultra-modern models. A well-chosen ceiling fan can be a fundamental piece in the decoration of a space.
- Versatile: A ceiling fan is appropriate for every space in a home.
- Bedroom: a ceiling fan is the best choice of air conditioning for warm summer nights. Also, they are primarily indicated for baby rooms, where according to some studies the beneficial effect of air circulation can reduce the risk of sudden death by 72%.
- – Dining room and living room: they cool and homogenize the temperature, both in summer and in winter, as well as providing a decorative bonus. Imagine a summer afternoon, lying on the couch and caressed by the soft breeze of a ceiling fan slowly turning … is it necessary to say something else?
- – Kitchen: they disperse odors, smoke, and heat.
- – Bath: they prevent moisture from getting stuck, helping towels and walls to dry faster and making the appearance of mold more difficult.
- – Terrace: cool and drive away insects.
How does a ceiling fan works?
The principle behind the operation of a fan is the mechanical movement of the blades (which can be made of plastic, wood or other materials) triggered by electricity. In fact, is connected to the electricity grid of the house and equipped with a special and “personal” switch on which to choose speed and direction of movement of the blades. In this way, we can choose the intensity of the air current created by the appliance in order to create the ideal climate in our home or office. Keep cool your home: http://www.hayzedmagazine.com/5-tips-keep-cool-home-environment/
But be careful, the fan is not only a useful ally against the summer heat: setting it on the rotation “on the contrary” it will, in fact, circulate the warm air generated by the environment during the winter, without dispersing it. In this sense, the fan is still the most economical choice for the creation of an ideal environment in any season of the year without weighing too much on our pockets and on our bills!