Mar. 07, 2024
Home Appliances
In a warm environment air movement with elevated velocity is a well-known cooling strategy. The local air movement is typically generated by cooling fans (e.g. ceiling fan, table fans, etc.). Appearance, power input and price are the main parameters considered today when purchasing cooling fans, while their cooling capacity and efficiency of energy use are unknown. A new index is introduced, named “cooling fan efficiency index” defined as the ratio between the cooling effect (measured with a thermal manikin) generated by the device and its power consumption.
The index was determined for a ceiling fan, a desk fan, a standing fan and a tower fan in a real office at three room air temperatures and at different fan speed levels. The results revealed that the index is sensitive enough to identify differences in the performance of the cooling devices. A standard method(s) for testing fan cooling effect and index(s) for determination of their efficiency, such as the proposed in this study cooling fan efficiency index, need to be developed.
The cooling fans generate a non-uniform velocity field around occupants which cannot be described with a single air velocity value. Therefore it is not clear how to apply in practice the recommended in the present standards eleveted velocity in a warm environment. The standards need to be revised.
Introduction to Fans and Fan Systems
Course Outline
A fan is a machine utilizing thin rotating rigid vanes, which is driven by a prime mover, which causes a compressible fluid to move. It might be useful to think of a fan as a very low-pressure compressor. This course covers the types and styles of fans and the systems they are contained within. The various purposes and uses of fans are encountered.
This course includes a multiple choice quiz at the end, which is designed to enhance the understanding of the course materials.
Learning Objective
At the conclusion of this two hour course, the student will learn the following regarding the selection and use of fans and fan systems:
Intended
Audience
The course is intended for Mechanical Engineers in the process and mechanical
industries but will provide helpful knowledge to Engineers of any discipline.
No prerequisites are required of the student but a basic familiarity with compressible
fluid flow would be helpful.
Course Content
The entirety of this course content is based on the United States Department of Energy (DOE) publication entitled Improving Fan System Performance: A Sourcebook for Industry. The publication was developed jointly by the DOE Industrial Technologies Program and the Air Movement and Control Association International, Inc. (AMCA). AMCA is a non-profit association of the world's manufacturers of related air system equipment.
For this course,
you are required to study Section 1 of the above publication. You may find it
helpful to review Appendix A as well.
Section 1 -
Introduction to Fan Systems
Appendix
A - Fan System Terminology
The link to the publication is Improving Fan System Performance: A Sourcebook for Industry.
Please click on the above underlined hypertext to view, download or print the document for your study.
Additional Resources
Chicago Blower Corporation, Glendale Heights, Illinois, has developed a series of free fan courses. The courses are numbered 100 through 500 and can be ordered for U.S. mail delivery from their website at http://www.chicagoblower.com/service/courses.asp. At the top of their home page, click on the button "FAN COURSES" and fill-out the order form. The course titles and subject areas are:
Quiz
Once
you finish studying the
above course content,
you need to
take a quiz
to obtain the PDH credits.
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