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US 12,487,016 B2Granted
Refrigeration cycle apparatus
AssigneeMitsubishi Electric Corporation
InventorsTakahito Hikone, Naoya Mukaitani
Life of this patent
Estimating the term…
Abstract
A refrigeration cycle apparatus includes a refrigerant circuit, a water circuit, a water heat exchanger, and a controller. The water circuit includes: a water pump; an inlet-side pressure sensor configured to detect an inlet-side water pressure that is a pressure of the heat medium which flows into the water heat exchanger; and an outlet-side pressure sensor configured to detect an outlet-side water pressure that is a pressure of the heat medium that flows out from the water heat exchanger. The controller is configured to determine whether air enters the water circuit or not based on the inlet-side water pressure and the outlet-side water pressure.
Claims5
A refrigeration cycle apparatus comprising:
- a refrigerant circuit in which refrigerant is circulated;
- a water circuit in which a heat medium is circulated;
- a water heat exchanger configured to cause heat exchange to be performed between the refrigerant and the heat medium;
- and
- a controller configured to control circulation of the refrigerant and circulation of the heat medium,
- wherein the water circuit includes
- a water pump configured to circulate the heat medium,
- an inlet-side pressure sensor provided on an inlet side of the water heat exchanger for the heat medium, and configured to detect an inlet-side water pressure that is a pressure of the heat medium which flows into the water heat exchanger, and
- an outlet-side pressure sensor provided on an outlet side of the water heat exchanger for the heat medium, and configured to detect an outlet-side water pressure that is a pressure of the heat medium that flows out from the water heat exchanger, and
- wherein the controller includes
- arithmetic circuitry configured to calculate an measured water flow rate that is an actual measurement value of a flow rate of the heat medium which flows in the water heat exchanger, on the basis of the inlet-side water pressure and the outlet-side water pressure, and calculate a first theoretical water flow rate that is a theoretical value of the flow rate of the heat medium that flows in the water heat exchanger, on the basis of an operating frequency of the water pump and the inlet-side water pressure, and
- entrance-of-air determination circuitry configured to determine whether air enters the water circuit or not on the basis of the measured water flow rate and the first theoretical water flow rate, and
- wherein the entrance-of-air determination circuitry that air enters the water circuit when the measured water flow rate is lower than the first theoretical water flow rate.
10 more elements
A refrigeration cycle apparatus comprising:
- a refrigerant circuit in which refrigerant is circulated;
- a water circuit in which a heat medium is circulated;
- a water heat exchanger configured to cause heat exchange to be performed between the refrigerant and the heat medium;
- and
- a controller configured to control circulation of the refrigerant and circulation of the heat medium,
- wherein the water circuit includes
- a water pump configured to circulate the heat medium,
- an inlet-side pressure sensor provided on an inlet side of the water heat exchanger for the heat medium, and configured to detect an inlet-side water pressure that is a pressure of the heat medium which flows into the water heat exchanger, and
- an outlet-side pressure sensor provided on an outlet side of the water heat exchanger for the heat medium, and configured to detect an outlet-side water pressure that is a pressure of the heat medium that flows out from the water heat exchanger,
- wherein the controller includes
- arithmetic circuitry configured to calculate a measured water flow rate that is an actual measurement value of a flow rate of the heat medium which flows in the water heat exchanger, on the basis of the inlet-side water pressure and the outlet-side water pressure, and calculate a pump head of the water pump on the basis of an operating frequency of the water pump, and
- entrance-of-air determination circuitry configured to determine whether air enters the water circuit or not, on the basis of the inlet-side water pressure and the pump head of the water pump, and
- wherein the entrance-of-air determination circuitry is configured to determine that air enters the water circuit, when a suction pressure of the water pump that is obtained by subtracting the pump head of the water pump from the inlet-side water pressure is less than 0.
10 more elements
A refrigeration cycle apparatus comprising:
- a refrigerant circuit in which refrigerant is circulated;
- a water circuit in which a heat medium is circulated;
- a water heat exchanger configured to cause heat exchange to be performed between the refrigerant and the heat medium;
- and
- a controller configured to control circulation of the refrigerant and circulation of the heat medium,
- wherein the water circuit includes
- a water pump configured to circulate the heat medium,
- an inlet-side pressure sensor provided on an inlet side of the water heat exchanger for the heat medium, and configured to detect an inlet-side water pressure that is a pressure of the heat medium which flows into the water heat exchanger,
- an outlet-side pressure sensor provided on an outlet side of the water heat exchanger for the heat medium, and configured to detect an outlet-side water pressure that is a pressure of the heat medium that flows out from the water heat exchanger, and
- a suction pressure sensor configured to detect a suction pressure that is a pressure of the heat medium which is sucked into the water pump,
- wherein the controller includes
- arithmetic circuitry configured to calculate a measure water flow rate that is an actual measurement value of a flow rate of the heat medium which flows in the water heat exchanger, on the basis of the inlet-side water pressure and the outlet-side water pressure, and calculate a second theoretical water flow rate that is a theoretical value of the flow rate of the heat medium which flows in the water heat exchanger, on the basis of the inlet-side water pressure, the suction pressure, and the operating frequency of the water pump, and
- entrance-of-air determination circuitry configured to determine whether air enters the water circuit or not on the basis of the measured water flow rate and the second theoretical water flow rate, and
- wherein the entrance-of-air determination circuitry is configured to determine that air enters the water circuit when the measured water flow rate is lower than the second theoretical water flow rate.
11 more elements
Dependencies are inferred from the claim text.