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Single-Pipe Systems for Commercial Applications


Cost-competitive and energy-efficient, single-pipe systems finally can be extended to commercial buildings.


by GREG CUNNIFF, PE, and BRETT ZERBA, Taco inc., Cranston, RI

Imagine an optimal hydronic HVAC system for a commercial building. What benefits would it deliver? First, it would provide comfort to all building zones. Second, it would be easy to install, operate, and maintain. Third, it would be competitive on a first- and operating-cost basis. Lastly, it would conserve the use of raw materials and be energy-efficient, a must in the "green" environment.

Since the 1950s, a system providing all of these benefits has been available—the single-pipe hydronic system. Single-pipe systems employ venturi tees, providing differential pressure to force water through terminal units. They are easy to design and install, use less materials, mostly are self-balancing, are easy to maintain, and are affordable to operate. These systems, however.

Click here or on the photo for a PDF of the article from the October 2006 issue of HPAC Engineering magazine.