Tone Air

Tone Air a siren can be made by blowing a jet of air through 22 equally spaced holes in a rotating disk.? The time it takes for successive holes to move past the air jet is the period of the soun...


Tone Air

Tone Air
a siren can be made by blowing a jet of air through 22 equally spaced holes in a rotating disk.?

The time it takes for successive holes to move past the air jet is the period of the sound. The siren is to produce a 2100 Hz tone. What must be the angular speed w (in rad/s) of the disk?

A sound of 2100 Hz means that the air pass through 2100 holes/second.

There are 22 holes per evolution of the disk therefore:

2100 holes/s x rev/22 holes = 95.45 rev/sec

1 rev = 2pi rad

95.45 x 2pi = rad/sec



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California Air Resources Board Enhances Refrigerant Gas Monitoring In Ab 32

The following explains the California Air Resource Board's (CARB) refrigerant gas management program to be enhanced in the California AB 32 legislation. Also included are further details related HVAC-R system refrigerant gas leak detection, monitoring, tracking, and reporting. These details all relate to the California Air Resources Board (CARB) regulation to be passed in early 2009 as well as the anticipated U.S. EPA adoption of similar regulations. Refrigerant gases can contribute to the major problem of global warming. Refrigerant gases, such as R-22, are contained in AC, HVAC, or more commonly called HVAC-R systems. HVAC systems show up in a myriad places, including hotels, hospitals, military bases, schools and universities, supermarkets, cold storage warehouses, food preparation, processing and service, recreational facilities, office, commercial and industrial facilities and industrial and manufacturing processes. The California Global Warming Solutions Act, commonly called AB 32, was introduced in 2006. It had the original requirements for statewide refrigerant gas reporting. The early action committee of the CARB has many scientists and refrigerant engineers who really understand the impacts refrigerant gases have on our environment and society. So, the Stationary Equipment Refrigerant Management Program was designed to help reduce greenhouse gases by the regulation of harmful CO2E emissions from the AC and refrigerant equipment, ranging in size between 50 and 200 pounds. Would you believe that over 180,000 places in the state of California are affected? There are numerous components making up the refrigerant gas management program. Refrigerant usage reports and the requirements for gas tracking include not only the manufacturing of the refrigerants but also the distribution, reclamation, and wholesale channels as well. All segments of the refrigerant industry must keep accurate records. HVAC-R technicians must be EPA certified to work or service repairs on many systems containing refrigerant gas because many refrigerants have hight GWP and also bad greenhouse gases (GHGs). Equipment must be retrofitted and repaired, leaks must be monitored and repaired and stringent procedures in place to cover service practices to reduce discharge. Almost forty years ago, the California Air Resources Board was formed to focus on air quality and areas for improvement. A good refrigerant gas management program is an essential element. CARB has been proactive, working with the people of the state, its' corporations and government bodies with the aim of protecting public health, welfare and the delicate ecology. California's size ensures that the problem potential for refrigerant gas emission is considerable. The California Air Resources Board is particularly concerned with recovering refrigerant from places that use stationary refrigerant and AC. Through scientific research and industry analysis, it is generally thought that GHG emission, caused by the release of refrigerant gases, could equal 35 million, metric tones of CO2e within 10 years. It is a learning curve for many organizations who own or operate HVAC-R systems and have facilities in California. To fully distribute the details on the refrigerant management program, CARB is offering industry workshops and meetings across California. Verisae, Inc has developed a refrigerant gas management application that is web-based and which automatically updates when new edicts are sent out by CARB, the California EPA and other government bodies. Refrigerant tracking solutions, often in the form of web-based applications with a centralized database, empower organizations with HVAC-R systems containing refrigerant gas to monitor, manage, and maintain records of usage and to better log leaks in chronological order throughout the year. Environmental Protection Agency (EPA) compliance all boils down to effective data management, the completion of required paperwork and reports; all of which is detailed in the EPA requiremetns. Air pollution and smog have been big enemies of the people of California over the years. Even though pollution has dropped by 25 percent since 1980 and smog exposure has come down a whopping fifty percent, there is much to do. The Stationary Equipment Refrigerant Management Program and other initiatives allow both CARB and the people of the state to breathe easier as the standard of air quality improves.

About the Author

Daniel Stouffer, Product Manager at Verisae, has much more detail on the importance of effective refrigerant gas management and the place of the California Air Resources Board. Refrigerant Tracker makes it easy to monitor, manage, and report refrigerant gas usage. Learn more at -- http://www.Refrigerant-Tracker.com

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