| 摘要 |
PROBLEM TO BE SOLVED: To provide a showcase, a temperature maintaining case and a temperature detection method for the temperature maintaining case which make it possible to detect the average temperature of a space where merchandise or a preservation object is housed. SOLUTION: According to a low temperature showcase 10, the average temperature T of a merchandise take-out port 14 communicating with a merchandise display space 13 can be detected by transmitting and receiving ultrasonic waves between a pair of ultrasonic sensors 30A and 30B arranged facing each other at positions crossing the merchandise take-out port 14 in a diagonal direction. Then, since the temperature and flow rate (volume) of air conditioning air to be blown to the merchandise display space 13 are determined on the basis of the detected average temperature T, the merchandise display space 13 is prevented from being excessively cooled or insufficiently cooled. Further, since the pair of ultrasonic sensors 30A and 30B are arranged so as to cross the merchandise take-out port 14 forward from the merchandise display space 13, the ultrasonic waves are not interrupted by the merchandise displayed in the merchandise display space 13, and the average temperature T is stably detected. COPYRIGHT: (C)2007,JPO&INPIT
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