PORTABLE AND STATIONARY COOLING UNITS FOR COMMERCIAL COOLING OF FRUITS AND VEGETABLES; COOLING UNITS FOR COMMERCIAL COOLING OF FRUITS AND VEGETABLES EMPLOYING COLD WATER EMERSION; COOLING UNITS FOR COMMERCIAL COOLING OF FRUITS AND VEGETABLES EMPLOYING VACUUM COOLING; COOLING UNITS FOR COMMERCIAL COOLING OF FRUITS AND VEGETABLES USING A COMBINATION OF COLD WATER SPRAY COOLING AND VACUUM COOLING; COOLING UNITS FOR COMMERCIAL COOLING OF FRUITS AND VEGETABLES EMPLOYING REFRIGERATED COLD AIR