In warmer months, operating between 60 and 100 percent of maximum speed, HVLS fansimprove comfort with either an evaporative cooling effect or the added effect of heat transfer – when skin temperature is warmer than air temperature. The addition of air movement does not cool the airbut rather creates a cooling sensation as the breeze passes over occupants’ skin,making a person feel up to 5.5 degrees Centigradecooler. For facilities with air conditioning systems, building operators can raise the air conditioning setpoint by several degrees without sacrificing comfort, reducing costs by as much as 15%.
Properly engineered, these fans move a massive amount of air where traditional, high velocity fans are rendered ineffective. When the airfoil length is doubled you’ve increased the surface area those airfoils sweep times four. The amount of air the fan moves increases at a much faster rate than the amount of power it takes to turn it as the size gets larger. So, with all things being equal, the fan will become more efficient as its size increases.AirFences installed at specific locations along the airfoil, redirect a portion of the air under the fan , directingit towards the floor, thereby increasing the efficiency and coverage area.
Stratification occurs because hot air, which is approximately 5-7% lighter than cool air, tends to rise to the ceiling. In the winter months, operating at 10 to 30 percent of the maximum speed, HVLS fans successfully destratify tall spaces, mixing the warm air at the ceiling level with the cooler air at the occupant level creating a uniform temperature without a draft. Moving the hot air off the ceiling helps the heating system maintain the same thermostat setpoint with less effort, resulting in a serious reduction in operating costs and increased thermal comfort for occupants.
Adding up all the parts
While ceiling fans improve the thermal comfort of occupants, it is also important to understand that advances in engineering design and manufacturing have allowed products to become more energy efficient and operate more effectively. Direct drive motors, end-user education, and high-efficiency airfoils yield maximum efficiency allowing businesses to operate in a far more energy efficient manner, reducing dependence on expensive heating and cooling systems, saving money, and improving comfort.
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