AIR VOLUME CONTROL DEVICE FOR DISPLAY CASE

摘要

PURPOSE:To enhance a freshness maintaining capacity by preventing room temperature rise at the time of defrosting. CONSTITUTION:An air temperature c at an outlet of an evaporator and an outside air temperature e are detected by a temperature sensor 2. Then, a difference f between a preset temperature d at the completion of defrosting and the air temperature c at the outlet of the evaporators is calculated. A fuzzy inference section 5 calculates an optimum correcting g for an amount of blast in an inner duct in accordance with a frosting condition of the evaporator and the outside air temperature e on the basis of the detected outside air temperature e and the calculated temperature difference f. Furthermore, a rotations deciding section 8 serving as a fan speed control corrects the rotations of a blast fan 10 in the inner duct on the basis of the correction g for an amount of blast to control the amount of blast in the inner duct at an optimum value.