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US 2013/0199224 A1Published application
Air-conditioning apparatus
AssigneeMitsubishi Electric Corporation
InventorsYohei Kato, Naoki Wakuta
Life of this patent
Estimating the term…
Abstract
While a compressor is stopped, a change rate of a refrigerant temperature per predetermined time is calculated on the basis of a value detected by a refrigerant temperature sensor, and a heating amount from a compressor heating unit to the compressor is made proportional to the change rate of the refrigerant temperature.
Claims15
An air-conditioning apparatus comprising:
- a refrigerant circuit in which at least a compressor, a heat-source-side heat exchanger, expansion means, and a use-side heat exchanger are connected by a refrigerant pipe, and through which a refrigerant is circulated;
- heating means that heats the compressor;
- first temperature detection means that detects a refrigerant temperature in the compressor;
- and
- a controller that controls the heating means;
- wherein while the compressor is stopped, the controller calculates a change of the refrigerant temperature per a time on the basis of a value detected by the first temperature detection means, and changes a heating amount to the compressor by the heating means on the basis of the change rate of the refrigerant temperature.
3 more elements
An air-conditioning apparatus comprising:
- a refrigerant circuit in which at least a compressor, a heat-source-side heat exchanger, expansion means, and a use-side heat exchanger are connected by a refrigerant pipe, and through which a refrigerant is circulated;
- heating means that heats the compressor;
- first temperature detection means that detects a refrigerant temperature in the compressor;
- second temperature detection means that detects a temperature of the compressor;
- and
- a controller that controls the heating means;
- wherein while the compressor is stopped, the controller calculates a heat exchange amount upon condensation of the refrigerant in the compressor on the basis of a difference between the refrigerant temperature detected by the first temperature detection means and the temperature of the compressor detected by the second temperature detection means, and changes a heating amount to the compressor by the heating means on the basis of the heat exchange amount.
4 more elements
An air-conditioning apparatus comprising:
- a refrigerant circuit in which at least a compressor, a heat-source-side heat exchanger, expansion means, and a use-side heat exchanger are connected by a refrigerant pipe, and through which a refrigerant is circulated;
- heating means that heats the compressor;
- third temperature detection means that detects a temperature of air that exchanges heat with the refrigerant in the heat-source-side heat exchanger;
- and
- a controller that controls the heating means, wherein
- a heating capacity of the heat-source-side heat exchanger is greater than a heating capacity of the use-side heat exchanger, and
- while the compressor is stopped, the controller calculates a change of a refrigerant temperature in the compressor per a time on the basis of a temperature detected by the third temperature detection means, and changes a heating amount to the compressor by the heating means on the basis of the change of the refrigerant temperature.
4 more elements
An air-conditioning apparatus comprising:
- a refrigerant circuit in which at least a compressor, a heat-source-side heat exchanger, expansion means, and a use-side heat exchanger are connected by a refrigerant pipe, and through which a refrigerant is circulated;
- heating means that heats the compressor;
- forth temperature detection means that detects a temperature of air that exchanges heat with the refrigerant in the use-side heat exchanger;
- and
- a controller that controls the heating means, wherein
- a heating capacity of the use-side heat exchanger is greater than a heating capacity of the heat-source-side heat exchanger, and
- while the compressor is stopped, the controller calculates a change of a refrigerant temperature in the compressor per a time on the basis of a temperature detected by the forth temperature detection means, and changes a heating amount to the compressor by the heating means on the basis of the change of the refrigerant temperature.
4 more elements
Dependencies are inferred from the claim text.