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1. (WO2018037482) LIQUID LEVEL DETECTION DEVICE, HEAT PUMP SYSTEM, AND LIQUID LEVEL DETECTION METHOD

Pub. No.:    WO/2018/037482    International Application No.:    PCT/JP2016/074543
Publication Date: Fri Mar 02 00:59:59 CET 2018 International Filing Date: Wed Aug 24 01:59:59 CEST 2016
IPC: G01F 23/22
F25B 49/02
Applicants: MITSUBISHI ELECTRIC CORPORATION
三菱電機株式会社
Inventors: TOYOSHIMA Masaki
豊島 正樹
OCHAI Yasutaka
落合 康敬
HAMADA Mamoru
濱田 守
Title: LIQUID LEVEL DETECTION DEVICE, HEAT PUMP SYSTEM, AND LIQUID LEVEL DETECTION METHOD
Abstract:
This liquid level detection device (100) detects the liquid level of a liquid stored in a vessel that has a temperature sensor disposed therein. After executing a first heating process for heating the temperature sensor, a heating control unit (110) executes a second heating process for reheating the temperature sensor. A liquid level detection unit (130) detects the liquid level on the basis of either a difference between a first heating time required in the first heating process until the temperature of the temperature sensor was increased by a prescribed temperature difference amount and a second heating time required in the second heating process until the temperature was increased by a prescribed temperature difference amount, or a difference between a first increase value by which the temperature increased during a prescribed time period in the first heating process and a second increase value by which the temperature increased during a prescribed time period in the second heating process.