Test standards for air filtration.

Concerns surrounding indoor air quality in commercial buildings have focused attention on the need for stringent filter performance testing. The Cl BSE engineer should be aware of several test standards

Field comparison of design and diagnostic pathways for duct efficiency evaluation.

A new method of test for residential thermal distribution efficiency is currently being developed under the auspices of the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE). This test method will have three main approaches, or "pathways," designated Design, Diagnostic, and Research. The Design Pathway uses builder's information to predict thermal distribution efficiency in new construction.

Opportunities for improving the energy efficiency of window-type room air conditioners.

As required by the National Appliance Energy Conservation Act (NAECA), minimum energy efficiency standards ranging from 8.0 to 9.0 EER went into effect for window-type room air conditioners on January 1, 1990. But by incorporating commonly used technologies such as high-efficiency rotary compressors, grooved refrigerant tubing, slit-type fins, subcoolers, and permanent split capacitor fan motors, 10.0 EER efficiency levels can be achieved for the most popular classes of room air conditioners without having to increase chassis size.

Come in, number 62.

A new version of the ASHRAE's Standard 62, which concentrates on ventilation and indoor air quality 
issues, has recently been released for pubIic review. What elements have.changed from the 1989 edition?