Air-conditioning apparatus
First Claim
1. An air-conditioning apparatus, comprising:
- a refrigerant circuit connecting a compressor, a heat source side heat exchanger, an expansion valve, and a use side heat exchanger in order with a refrigerant piping;
a compressor heater for heating the compressor when the compressor is not in operation;
a compressor temperature sensor for detecting a compressor temperature;
a refrigerant temperature detection sensor for detecting a refrigerant temperature in the compressor; and
a controller configured to;
estimate an amount of liquid refrigerant in the compressor by integrating the temperature difference between the compressor temperature and the refrigerant temperature during a period in which the compressor temperature becomes lower than the refrigerant temperature,andcontrol the heating operation, which is carried out by the compressor heater, on the basis of the estimated liquid refrigerant amount when the compressor is not in operation.
1 Assignment
0 Petitions
Accused Products
Abstract
An air-conditioning apparatus, including a refrigerant circuit connecting a compressor, a heat source side heat exchanger, an expansion valve, and a use side heat exchanger in order with a refrigerant piping. A compressor heater is provided for heating the compressor when the compressor is not in operation. A compressor temperature sensor is provided for detecting a compressor temperature. A refrigerant temperature detection sensor is provided for detecting a refrigerant temperature in the compressor. A controller is configured to estimate an amount of liquid refrigerant in the compressor by integrating the temperature difference between the compressor temperature and the refrigerant temperature during a period in which the compressor temperature becomes lower than the refrigerant temperature, and control the heating operation, which is carried out by the compressor heater, on the basis of the estimated liquid refrigerant amount when the compressor is not in operation.
11 Citations
5 Claims
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1. An air-conditioning apparatus, comprising:
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a refrigerant circuit connecting a compressor, a heat source side heat exchanger, an expansion valve, and a use side heat exchanger in order with a refrigerant piping; a compressor heater for heating the compressor when the compressor is not in operation; a compressor temperature sensor for detecting a compressor temperature; a refrigerant temperature detection sensor for detecting a refrigerant temperature in the compressor; and a controller configured to; estimate an amount of liquid refrigerant in the compressor by integrating the temperature difference between the compressor temperature and the refrigerant temperature during a period in which the compressor temperature becomes lower than the refrigerant temperature, and control the heating operation, which is carried out by the compressor heater, on the basis of the estimated liquid refrigerant amount when the compressor is not in operation. - View Dependent Claims (2, 3, 4)
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5. An air-conditioning apparatus, comprising:
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a refrigerant circuit connecting a compressor, a heat source side heat exchanger, an expansion valve, and a use side heat exchanger in order with a refrigerant piping; a compressor heater for heating the compressor when the compressor is not in operation; a compressor temperature sensor for detecting a compressor temperature; an outdoor air temperature detection sensor for detecting at least one of a surrounding temperature and a surface temperature of the heat source side heat exchanger; and a controller configured to; control a heating operation, which is carried out by the compressor heater, estimate an amount of liquid refrigerant in the compressor by integrating the temperature difference between the compressor temperature and at least one of the surrounding temperature and the surface temperature during a period in which the compressor temperature becomes lower than at least one of the surrounding temperature and the surface temperature, control the heating operation, which is carried out by the compressor heater, on the basis of the estimated liquid refrigerant amount when the compressor is not in operation.
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Specification