| 摘要 |
PROBLEM TO BE SOLVED: To prevent intrusion of hydrocarbon into a passenger room even when it leaks, to dilute a leaked coolant by outside air so that it does not explode and to minimize leaked gas quantity on an air conditioner using hydrocarbon as a coolant. SOLUTION: This air conditioner is constituted of a first stage refrigerating cycle A with hydrocarbon as a coolant and a second stage refrigerating cycle B with water as a coolant, and a passenger room 20 is cooled by the second stage refrigerating cycle B. An indoor cabin is isolated from the cabin outside by a partition wall and is frame-structured so that an intermediate heat exchanger room in which an intermediate heat exchanger to exchange heat is arranged is ventilated by air of an outdoor air blower between the first stage and second stage refrigerating cycles. Additionally, a compressor is stopped by detecting gas leakage or detecting temperature rise, and gas leaking quantity is minimized by closing a solenoid valve on the high pressure side.
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