| 摘要 |
PURPOSE:To improve control capacity, by so constituting that an additional decision of capacity is done in comparison with a decision of a cold water temperature gradient, arrival time for the upper and the lower limits of a setting temperature and response delay time for a refrigerator, in multistep variable air conditioning control applying a plurality of miniature suction water cooling machine. CONSTITUTION:When a cold water temperature theta is within a range of a setting temperature, for example, between 6 deg.C and 10 deg.C, and average cold water temperature gradient (m) is reckoned and plus and minus of the gradient (m) are decided by measuring the cold water temperature, and when the gradient (m) is plus an upper limit temperature arrival time (Th) is reckoned in consideration of a final sampling cold water temperature theta5. When this time (Th) is within a build up delay time a refrigerating capacity increasing process is carried out according to a program. In a like manner, when the gradient (m) is minus a lower limit arrival time (Te) for a setting temperature is obtained and when the time (Te) is less than a fall time of the refrigerator an increasing process of a number of operating units of refrigerators is carried out. With this repetition, controlling performance is improved by introducing forecast control. |
