| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an open showcase capable of attaining energy saving while keeping high reliability in operation even if an air curtain air speed is increased.SOLUTION: An open showcase 100 of this invention comprises a low stage compressor 1, an auxiliary radiator 2 for heat exchanging between refrigerant discharged out of the low stage compressor 1 and surrounding atmosphere, a high stage compressor 3 for compressing refrigerant heat exchanged by the auxiliary radiator 2, a high stage radiator 4 for heat exchanging between refrigerant discharged out of the high stage compressor 3 and the surrounding air, a decompression device for decreasing pressure of the refrigerant and a cooler (an evaporator 6) for evaporating the refrigerant. The auxiliary radiator 2 and the high stage radiator 4 are constituted on the basis of a theoretical radiation amount rate at a low temperature that is a theoretical value of a rate between a radiation amount of the auxiliary radiator 2 in respect to a total radiation amount of a radiation amount of the auxiliary radiator 2 and a radiation amount of the high stage radiator 4 where the refrigerant becomes a saturated state at the refrigerant flowing-out port of the auxiliary radiator 2 under a low surrounding temperature condition in which the surrounding air temperature becomes an estimated lower limit temperature.</p> |
