Convect-Air^TM Heated Air Circulation

Designed for accelerated curing/hardening of Precast concrete products in insulated enclosures. Temperatures from 40^ºC to 60^ºC (105^ºF to 140^ºF) allow for removal of conrete products from the curing chamber within 6 to 8 hours.

Convect-Air^TM utilizes a heavy-duty air heater and high performance radial ventilator to provide a consistent warm curing environment throughout the entire chamber.

Upon reaching the desired temperature, the heater switches off. The circulation ventilator continues operating in order to maintain even temperatures. As fresh concrete products are added, the heater switches on in order to maintain the desired temperature.

The recirculation of the chamber environment eliminates temperature stratification and provides a 92% operating efficiency.

---

Principle Behind Convect-Air^TM

Warm dry air has the natural tendency to rise - causing temperature stratification within the insulated curing chamber. The single most important function of Kraft Energy^TM's distribution system is the maintenance of no greater than +/- 1^ºC temperature difference throughout the curing chamber.

Kraft Energy^TM's concept places the air heater on the opposite side of the chamber from the air distribution system. The heater pulls the supply air from the lowest point in the curing chamber and exhausts the heated air across the length and height of the chamber on the opposite wall.

The number of distribution ducts across the length of the chamber as well as the number of nozzles in each distribution duct is calculated based on three parameters:

• pressure zones
• temperature zones
• pallet location

Once the macro-environmental parameters have been calculated, the addition of a mechanical damper in each nozzle allows for fine tuning the system.

All ductwork, dampers and nozzles are manufactured of low restriction, high volume galvanized sheet steel. Flanges are bolted.