Reducing communication load on contract net by case-based reasoning:extension with directed contract

An evaporative cooling system for a hydrostatic cooker having an endless conveyor for moving rows of hot containers along a vertical zig-zag path through a vertically elongated cooling chamber. The system includes a plurality of vertically spaced troughs for directing cooling water against hot containers being processed, a sump for collecting the cooling water, pumps for recirculating the cooling water from the sump to the troughs, and means for adding make-up water to the sump. The system also includes a high volume-low velocity exhaust fan mounted on the upper end of the cooling chamber for drawing air upwardly through the cooling chamber to reduce the pressure within the cooling chamber below atmospheric and thereby increase the rate of evaporative cooling to such an extent that the cooling temperature becomes stable and make up water is required only to compensate for water loss through evaporation.