ENGINEERING.com has updated it's forum.  To post a question please visit the new Ask@ Forum.   

With a database of over 10000 questions the library will remain available for an extended period.
Q&A


sccrowl		 The most efficient direction for the operation of a Ceil Fan View All
I would like someone to explain in scientific term the proper direction of a ceil fan for the efficient cooling in the summer and the efficient warming of a room. The definition given by contractors I believe is in error. Contractors: down in the summer and up in the winter.

I believe the opposite is true from a heat transfer and thermodynamic persective.



13 years ago - 3 weeks left to answer. - 2 responses - Report Abuse
Respond to question
    0      [lnkReport]        0       0       
Share |
  Responses

Niel
 Below is an excellent article which describes the reason for the fan direction as described by your contractor.

1. Down for the wind chill effect
2. Up to clear the warm air trapped at the ceiling.

There are some modifications to this basic rule.

Niel Leon
engineering.com

13 years ago

Source: http://www.ceilingfan.org/ceiling-fan-direction/


  0     0         

jwd217
 Since heat rises the air near the ceiling of a room can be warmer than at the floor. If the goal were to keep the temperature of the air in the room equal then having the fan blow down when heating and up when cooling would probably work best. However, the goal is usually to make the room comfortable for the occupants. With the fan blowing down on occupants they usually feel cooler. So down in summer and up in winter is what feels best even if it not the most efficient.

13 years ago

Source:
Best Answer

  0     0         

ENGINEERING.com does not provide engineering advice. The Ask@ service is a forum for members to exchange ideas relating to the world of engineering. We caution users not to accept any responses that they receive without further validation, and not to rely on any engineering advice that they may get from other members of the Ask@ forum. ENGINEERING.com specifically disclaims any obligation to validate or verify any information posted within the Ask@ service. ENGINEERING.com encourages users to seek the services of a professional engineer for any engineering advice they may require.