At a large midwestern printing plant, solvents used in ink from presses generate harmful vapors. Two regenerative thermal oxidizers, with a combined 70,000 CFM exhaust, incinerate the VOCs. Rather than let all that heat go to waste up a stack, the company wisely uses it to heat its facility.
Two Munters Series 81 Thermo-Z air-to-air heat exchangers, one on each incinerator, capture exhaust heat and use it to heat outside air for plant makeup air in winter. Each heat exchanger is part of a complete packaged heat recovery system that also includes supply and exhaust fans, dampers, and filters. Under design conditions, the systems heat air from -10°F to 130°F using 250°F exhaust from one incinerator and 350°F exhaust from the other. Combined, they can transfer over 10,400,000 BTUs per hour.
The Munters packaged heat recovery system controls the temperature to the space to a consistent 130°F by modulating the hot gas flow through the heat exchanger.