Direct Contact LLC (DCLLC) Heat Recovery Systems bring heated exhaust
or vent gases into direct contact with a cooling liquid. This differs significantly
from systems that employ coils or plates to provide the heat transfer surface and
keep the streams separated (indirect).
The heat transfer coefficient of DCLLC’s unique direct contact
method (500-1000 BTU/hr-ft2-°F) is many times
larger than that of the typical indirect method (approximately 10 BTU/hr-ft2-°F), providing a much more efficient method of
recovering heat and allowing for smaller units that perform better.
The DCLLC system also efficiently drops the temperature of the
gas stream to below its condensation temperature (Wet-bulb temperature
(view graph),) forcing water condensation from the waste stream. This capability
generates additional utility savings by recovering water that is otherwise lost
and using it to significantly lower makeup water demands.