How Do Ceiling Fans Enhance Winter Heating Efficiency?

In summary: Fans do not just push the hot air outwards- they also create a draft which increases the air temperature in the room. This causes the hot air to flow downwards instead of being pushed outwards.
  • #1
Dreebs
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Homework Statement


Why will operating ceiling fans during the winter improve the house's heating efficiency and reduce the heat flow between the ceiling just below the attic and the cold attic itself?
a. Stirring air always makes it feel warm and helps prevent thermal conductivity.
b. Stirring the air increases the temperature of air near the ceiling just below the attic. That higher temperature at the ceiling results in less heat flow from the ceiling to the attic.
c. Stirred air is hot air, so it doesn't have to be heated to be hot.
d. Stirring the air brings hot air down from the ceilings to where people live and reduces the temperature difference between the ceiling just below the attic and the attic floor.

D, because the fan pushes the hot air on the ceiling out towards the wall. This force causes the air to move downwards heating the house.
 
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  • #2
Dreebs said:

Homework Statement


Why will operating ceiling fans during the winter improve the house's heating efficiency and reduce the heat flow between the ceiling just below the attic and the cold attic itself?
a. Stirring air always makes it feel warm and helps prevent thermal conductivity.
b. Stirring the air increases the temperature of air near the ceiling just below the attic. That higher temperature at the ceiling results in less heat flow from the ceiling to the attic.
c. Stirred air is hot air, so it doesn't have to be heated to be hot.
d. Stirring the air brings hot air down from the ceilings to where people live and reduces the temperature difference between the ceiling just below the attic and the attic floor.

D, because the fan pushes the hot air on the ceiling out towards the wall. This force causes the air to move downwards heating the house.
I agree that the answer is d, but I disagree with your interpretation of the reason why.
 
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Related to How Do Ceiling Fans Enhance Winter Heating Efficiency?

1. How do ceiling fans cool a room?

Ceiling fans cool a room by creating a wind chill effect. When the fan blades rotate, they push air down towards the floor. This moving air creates a breeze that evaporates moisture from our skin, making us feel cooler. This is similar to the way a cool breeze on a hot day can provide relief from the heat.

2. What is the ideal height for a ceiling fan?

The ideal height for a ceiling fan is 8-9 feet from the floor to the fan blades. This ensures proper air circulation and prevents the fan from being too low and causing discomfort or too high and being ineffective.

3. How do I choose the right size ceiling fan for my room?

The size of the ceiling fan you need depends on the size of your room. As a general rule, for rooms up to 75 square feet, a 36-inch fan is recommended. For rooms between 76-144 square feet, a 42-inch fan is ideal. For larger rooms, a 52-inch fan is recommended. It's also important to consider the height of your ceiling when choosing a fan size.

4. Can ceiling fans be used in the winter?

Yes, ceiling fans can be used in the winter to help distribute warm air throughout the room. Most ceiling fans have a reverse switch that allows the blades to rotate in the opposite direction, pushing warm air down from the ceiling.

5. How much energy do ceiling fans use?

The energy consumption of a ceiling fan varies depending on the size and speed of the fan. On average, a ceiling fan uses between 10-120 watts of electricity. This is significantly less than most air conditioning units, making ceiling fans a more energy-efficient option for cooling a room.

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