Heat exchanger and cooling apparatus mounted with the same

A cooling apparatus in which a refrigerant circuit is formed by connecting a compressor, an outdoor heat exchanger, a pressure reducing device, an indoor heat exchanger and the like through piping,

• wherein said indoor heat exchanger and/or outdoor heat exchanger have a plurality of fins and a refrigerant conduit passing through said plurality of fins, which refrigerant conduit is divided into a plurality of sets, each set comprising a plurality of parallel conduits, said parallel conduits of a set being put in communication with each other at the ends thereof and in communication through a single passage with the ends of the parallel conduits of another set, wherein said refrigerant circuit is charged with a refrigerant prepared by mixing a plurality of ingredient hydrofluoracarbon refrigerants not containing chlorine, said cooling apparatus further comprising:
• a refrigerant density detector including a sonic velocity measuring device for measuring a sonic velocity of the mixed refrigerant, a thermometer for measuring a temperature of the mixed refrigerant, and a pressure gauge for measuring a pressure of the mixed refrigerant;
• a refrigerant charge portion provided in the piping of said refrigerant circuit;
• a plurality of refrigerant tanks of different kinds connected to said refrigerant charge portion through control valves;
• and
• a controller for controlling the opening and closing of the control valves,
• wherein the refrigerant density detector detects a density of the mixed refrigerant in said refrigerant circuit and wherein said controller is adapted to charge said refrigerant circuit with a required kind of refrigerant by a required quantity from said refrigerant tanks according to a result of the detection.

A cooling apparatus in which a refrigerant circuit is composed by connecting a compressor, an outdoor heat exchanger, a pressure reducing device, an indoor heat exchanger and the like through piping,

• wherein said indoor heat exchanger and/or outdoor heat exchanger have a plurality of fins and a refrigerant conduit provided through said plurality of fins, said refrigerant conduit comprises:
• a plurality of sets, each set including a plurality of refrigerant conduits arranged in parallel, and
• a connection conduit which is placed between said sets and is connected to the refrigerant conduits of two sets at the ends thereof and which has a single passage for placing said both sets in communication with each other,
• wherein said refrigerant circuit is charged with a refrigerant prepared by mixing a plurality of ingredient hydrofluorocarbon refrigerants not containing chlorine, said cooling apparatus further comprising:
• a refrigerant density detector including a sonic velocity measuring device for measuring a sonic velocity of the mixed refrigerant, a thermometer for measuring a temperature of the mixed refrigerant, and a pressure gauge for measuring a pressure of the mixed refrigerant;
• a refrigerant charge portion provided in the piping of said refrigerant circuit;
• a plurality of refrigerant tanks of different kinds connected to said refrigerant charge portion through control valves;
• and
• a controller for controlling the opening and closing of the control valves,
• wherein the refrigerant density detector detects a density of the mixed refrigerant in said refrigerant circuit and wherein said controller is adapted to charge said refrigerant circuit with a required kind of refrigerant by a required quantity from said refrigerant tanks according to a result of the detection.