公开(公告)号：US20170219260A1

公开(公告)日：2017-08-03

申请号：US15500370

申请日：2015-08-13

Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.

Inventor： Yoshie TOGANO ,  Kenji UEDA ,  Noriyuki MATSUKURA

IPC: F25B43/04

CPC classification number: F25B43/043 ,  F25B49/02 ,  F25B2700/21161 ,  F25B2700/21172 ,  F25B2700/21173

Abstract: The purpose of the present invention is to achieve stable operation when using a low pressure, low GWP refrigerant. In the present invention, a control device (16) is provided with an estimation unit (31), a determination unit (32), and an activation control unit (33). The estimation unit (31) estimates the amount of air entering using a degree of influence of air entering, which represents the ease with which air enters determined by the structure of the chiller, and a variable obtained by a function including pressure as a parameter. The determination unit (32) determines whether a total value for the amount of air entering is greater than or equal to a preset tolerance value. The activation control unit (33) activates a bleed device when the total value of the amount of air entering is equal to or greater than the tolerance value.