Patent ID: 8959951
Filing Date: 2015-02-24
Classification: F25B

Abstract:
1. A refrigerating apparatus where a working refrigerant reaches a supercritical state in at least part of a refrigeration cycle, the refrigerating apparatus comprising: a first expansion mechanism arranged and configured to reduce pressure of refrigerant; a second expansion mechanism arranged and configured to reduce pressure of refrigerant; an evaporator connected to the first expansion mechanism, the evaporator being arranged and configured to evaporate refrigerant; a first compression element arranged and configured to suck in, compress and discharge refrigerant; a second compression element arranged and configured to suck in, further compress and discharge refrigerant that has been discharged from the first compression element; a third refrigerant pipe arranged and configured to allow refrigerant that has been discharged from the first compression element to be sucked into the second compression element; a radiator connected to a discharge side of the second compression element; a first refrigerant pipe interconnecting the radiator and the first expansion mechanism; a fourth refrigerant pipe branching from the first refrigerant pipe and extending to the second expansion mechanism; a fifth refrigerant pipe extending from the second expansion mechanism to the third refrigerant pipe; a second heat exchanger arranged and configured to cause heat exchange to be performed between refrigerant flowing through the first refrigerant pipe and refrigerant flowing through the fifth refrigerant pipe; a temperature detector arranged and configured to detect a value of at least either one of a controller configured to control the second expansion mechanism to increase a quantity of the refrigerant passing therethrough an external cooler arranged and configured to cool refrigerant passing through the third refrigerant pipe; an external temperature detector arranged and configured to detect a temperature of a fluid passing through the external cooler; and a third refrigerant temperature detector arranged and configured to detect a temperature of refrigerant passing through the third refrigerant pipe, the controller being further configured to control the second expansion mechanism to increase the quantity of the refrigerant passing therethrough when a difference between the temperature detected by the external temperature detector and the temperature detected by the third refrigerant temperature detector has become less than a predetermined value.