Eric Chrencik, HPAC Engineering
Summary
High-temperature-hot-water (HTHW) systems have been in use in Europe, serving residential and commercial heating needs, since the early 1900s. As technologies improved and stronger materials were developed, HTHW systems gained traction in the United States. Today, they are applied stateside on campuses where large amounts of heat need to be distributed without the maintenance hassles of steam.
HTHW systems typically operate with supply temperatures of 350°F and greater. The system pressure usually is set approximately 25 psi above the saturation pressure of the operating temperature. System pressure is critical to prevent water from flashing to steam and to avoid pump cavitation.
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