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The heat pump system with a comparator and a blind controller was applied to the air temperature control in a growth chamber. Settling time in step response, the accuracy in the fixed command control ...of air temperature and the power requirements of the control were examined. It was found in the characteristics that the response times are relatively short, and the accuracies are about ±1℃. The system was simpler and able to be driven with smaller power requirements, as compared with the other prevailed systems. Thus, the construction cost and the running energy were extremely low. From these facts, it was suggested that the heat pump system is useful for the air temperature control in the growth chamber.続きを見る
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