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A practical Guide to Noise and Vibration Control for HVAC Systems 2nd Edition- for free


Since the1991 edition of this guide was published, building owners and managers have paid more attention to occupant comfort, and municipal ordinances have paid more attention to noise emissions between properties. As a result, the HVAC industry has become more sensitive to the acoustic design of products and systems. Many equipment manufacturers are producing quieter products, sometimes using acoustic benefits as a primary marketing feature.

The growing interest in the acoustical performance of products is evidenced by the fact that the number of HVAC acoustical testing laboratories has nearly doubled since 1991. In addition, internationalization has increased the availability of low-noise HVAC products from Europe and Asia. System designers are paying closer attention to the acoustical performance of the products and systems they specify, and many building owners now require acoustic consultants on their project design teams.

Unfortunately, not all industry changes improve quietness. Energy-efficient screw (rotary) compressors are the source of many noise and vibration complaints. In addition, the growing momentum to remove internal sound insulation liners from ducts and to cover sound insulation liners in air handling units and terminal boxes with heavy-duty sheet metal has narrowed the choices of noise reduction strategies available for system design. These and

other factors have increased the importance of system design in the form of greater attention to vibration isolation and air flow aerodynamics in air distribution systems.

This means that most HVAC system noise and vibration problems are system problems resulting from improper selection, design, or installation of components into a complete system. By paying more careful attention to these factors, the number and severity of noise and vibration complaints can be greatly reduced.

About the Book

The second edition of this guide uses SI units, covers the acoustical properties of a wide range of HVAC system components along with many noise and vibration control products, and provides strategies for equipment selection and system design. Based on comments from readers of the first edition, the guide has been reorganized for ease of use and includes more charts and photographs. The first edition was published with research funding from ASHRAE.

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