An air-conditioning apparatus includes a compressor, an indoor heat exchanger configured to function as a condenser or an evaporator, indoor heat exchanges each configured to function as a condenser or an evaporator, a plurality of expansion valves each provided for a corresponding one of the indoor
An air-conditioning apparatus includes a compressor, an indoor heat exchanger configured to function as a condenser or an evaporator, indoor heat exchanges each configured to function as a condenser or an evaporator, a plurality of expansion valves each provided for a corresponding one of the indoor heat exchangers each configured to adjust a flow rate of a refrigerant that flows through the corresponding indoor heat exchanger, and a controller configured to control an operation capacity of the compressor and opening degrees of a plurality of expansion devices. When increasing heat exchange performance of the indoor heat exchanger, the controller increases the operation capacity of the compressor and controls the opening degree of the expansion valve corresponding to the indoor heat exchanger to decrease the flow rate of the refrigerant that flows through the indoor heat exchanger.
대표청구항▼
1. An air-conditioning apparatus comprising: a compressor; a heat source side heat exchanger configured to function as a condenser or an evaporator; a plurality of use side heat exchangers each configured to function as a condenser or an evaporator; a plurality of expansion devices each provided for
1. An air-conditioning apparatus comprising: a compressor; a heat source side heat exchanger configured to function as a condenser or an evaporator; a plurality of use side heat exchangers each configured to function as a condenser or an evaporator; a plurality of expansion devices each provided for a corresponding one of the plurality of use side heat exchangers, and each configured to adjust a flow rate of a refrigerant that flows through the corresponding one of the plurality of use side heat exchangers; and a controller configured to control an operation capacity of the compressor and opening degrees of the plurality of expansion devices, whereinwhen increasing heat exchange performance of a first use side heat exchanger that is at least one, but not all, of the plurality of use side heat exchangers, the controller increases the operation capacity of the compressor, andcontrols the opening degree of the expansion device corresponding to a second use side heat exchanger that is at least one of the plurality of use side heat exchangers that perform a function identical to a function of the first use side heat exchanger, to decrease a flow rate of the refrigerant that flows through the second use side heat exchanger, the second use side heat exchanger being different from the first use side heat exchanger,the heat source side heat exchanger is configured to function as an evaporator and the plurality of use side heat exchangers are configured to function as condensers,the controller is configured to control the operation capacity of the compressor such that condensing saturation temperatures of the refrigerant that flows through the plurality of use side heat exchangers become a predetermined condensing saturation temperature target value, andwhen increasing the heat exchange performance of the first use side heat exchanger, the controller increases the operation capacity of the compressor by increasing a value of the condensing saturation temperature target value,the controller is configured to control the opening degrees of the expansion devices corresponding to the plurality of use side heat exchangers that function as condensers such that degrees of subcooling of the refrigerant that flows through the plurality of use side heat exchangers that function as condensers become a predetermined target degree of subcooling, andwhen increasing the heat exchange performance of the first use side heat exchanger, decreases the flow rate in the second use side heat exchanger by increasing the target degree of subcooling. 2. The air-conditioning apparatus of claim 1, wherein if the operation capacity of the compressor has not reached an upper limit after the operation capacity of the compressor has been increased,the controllercontrols the opening degree of the expansion device corresponding to the first use side heat exchanger to increase a flow rate of the refrigerant that flows through the first use side heat exchanger. 3. The air-conditioning apparatus of claim 1, wherein some of the plurality of use side heat exchangers are intermediate heat exchangers at each of which the refrigerant supplied from the heat source side heat exchanger and a heat medium different from the refrigerant exchange heat,some of the rest of the plurality of use side heat exchangers are direct-expansion heat exchangers at each of which the refrigerant supplied from the heat source side heat exchanger and indoor air exchange heat,the air-conditioning apparatus further comprises at least one indirect heat exchanger that is connected to a heat medium passage of the intermediate heat exchangers and at which the heat medium and indoor air exchange heat,the first use side heat exchanger is the intermediate heat exchanger, andthe second use side heat exchanger in which the flow rate of the refrigerant is decreased when the heat exchange performance of the first use side heat exchanger is increased is the direct-expansion heat exchanger. 4. An air-conditioning apparatus comprising: a compressor; a heat source side heat exchanger configured to function as a condenser or an evaporator; a plurality of use side heat exchangers each configured to function as a condenser or an evaporator; a plurality of expansion devices each provided for a corresponding one of the plurality of use side heat exchangers, and each configured to adjust a flow rate of a refrigerant that flows through the corresponding one of the plurality of use side heat exchangers; and a controller configured to control an operation capacity of the compressor and opening degrees of the plurality of expansion devices, whereinwhen increasing heat exchange performance of a first use side heat exchanger that is at least one, but not all, of the plurality of use side heat exchangers, the controller increases the operation capacity of the compressor, andcontrols the opening degree of the expansion device corresponding to a second use side heat exchanger that is at least one of the plurality of use side heat exchangers that perform a function identical to a function of the first use side heat exchanger, to decrease a flow rate of the refrigerant that flows through the second use side heat exchanger, the second use side heat exchanger being different from the first use side heat exchanger,the heat source side heat exchanger is configured to function as a condenser and the plurality of use side heat exchangers are configured to function as evaporators,the controller is configured to control the operation capacity of the compressor such that evaporating saturation temperatures of the refrigerant that flows through the plurality of use side heat exchangers become a predetermined evaporating saturation temperature target value, andwhen increasing the heat exchange performance of the first use side heat exchanger, the controller increases the operation capacity of the compressor by decreasing a value of the evaporating saturation temperature target value,the controller is configured to control the opening degrees of the plurality of expansion devices of the plurality of use side heat exchangers that function as evaporators such that degrees of superheat of the refrigerant that flows through the use side heat exchangers become a predetermined target degree of superheat, andwhen increasing the heat exchange performance of the first use side heat exchanger, the controller decreases the flow rate in the second use side heat exchanger by increasing the target degree of superheat. 5. The air-conditioning apparatus of claim 4, wherein some of the plurality of use side heat exchangers are intermediate heat exchangers at each of which the refrigerant supplied from the heat source side heat exchanger and a heat medium different from the refrigerant exchange heat,some of the rest of the plurality of use side heat exchangers are direct-expansion heat exchangers at each of which the refrigerant supplied from the heat source side heat exchanger and indoor air exchange heat,the air-conditioning apparatus further comprises at least one indirect heat exchanger that is connected to a heat medium passage of the intermediate heat exchangers and at which the heat medium and indoor air exchange heat,the first use side heat exchanger is the intermediate heat exchanger, andthe second use side heat exchanger in which the flow rate of the refrigerant is decreased when the heat exchange performance of the first use side heat exchanger is increased is the direct-expansion heat exchanger. 6. An air-conditioning apparatus comprising: a compressor; a heat source side heat exchanger configured to function as a condenser or an evaporator; a plurality of use side heat exchangers each configured to function as a condenser or an evaporator; a plurality of expansion devices each provided for a corresponding one of the plurality of use side heat exchangers, and each configured to adjust a flow rate of a refrigerant that flows through the corresponding one of the plurality of use side heat exchangers; and a controller configured to control an operation capacity of the compressor and opening degrees of the plurality of expansion devices, whereinwhen increasing heat exchange performance of a first use side heat exchanger that is at least one, but not all, of the plurality of use side heat exchangers, the controller increases the operation capacity of the compressor, andcontrols the opening degree of the expansion device corresponding to a second use side heat exchanger that is at least one of the plurality of use side heat exchangers that perform a function identical to a function of the first use side heat exchanger, to decrease a flow rate of the refrigerant that flows through the second use side heat exchanger, the second use side heat exchanger being different from the first use side heat exchanger,the heat source side heat exchanger is configured to function as an evaporator, some of the plurality of use side heat exchangers are configured to function as condensers, and some of the rest of the plurality of use side heat exchangers are configured to function as evaporators,the controller controls the operation capacity of the compressor such that condensing saturation temperatures of the refrigerant that flows through the plurality of use side heat exchangers that function as condensers become a predetermined condensing saturation temperature target value,the first use side heat exchanger is configured to function as a condenser, andwhen increasing the heat exchange performance of the first use side heat exchanger, the controller increases the operation capacity of the compressor by increasing a value of the condensing saturation temperature target value, andthe controller is configured to control the opening degrees of the plurality of expansion devices corresponding to the plurality of use side heat exchangers that function as condensers such that degrees of subcooling of the refrigerant that flows through the plurality of use side heat exchangers that function as condensers become a predetermined target degree of subcooling, andwhen increasing the heat exchange performance of the first use side heat exchanger, the controller decreases the flow rate in the second use side heat exchanger by increasing the target degree of subcooling. 7. The air-conditioning apparatus of claim 6, wherein some of the plurality of use side heat exchangers are intermediate heat exchangers at each of which the refrigerant supplied from the heat source side heat exchanger and a heat medium different from the refrigerant exchange heat,some of the rest of the plurality of use side heat exchangers are direct-expansion heat exchangers at each of which the refrigerant supplied from the heat source side heat exchanger and indoor air exchange heat,the air-conditioning apparatus further comprises at least one indirect heat exchanger which is connected to a heat medium passage of the intermediate heat exchangers and at which the heat medium and indoor air exchange heat,the intermediate heat exchangers include an intermediate heat exchanger configured to function as a condenser and an intermediate heat exchanger configured to function as an evaporator,the first use side heat exchanger is the intermediate heat exchanger connected to the indirect heat exchanger having a larger heat exchange load, andthe second use side heat exchanger in which the flow rate of the refrigerant is decreased when the heat exchange performance of the first use side heat exchanger is increased is the direct-expansion heat exchanger. 8. The air-conditioning apparatus of claim 6, wherein some of the plurality of use side heat exchangers are intermediate heat exchangers at each of which the refrigerant supplied from the heat source side heat exchanger and a heat medium different from the refrigerant exchange heat,some of the rest of the plurality of use side heat exchangers are direct-expansion heat exchangers at each of which the refrigerant supplied from the heat source side heat exchanger and indoor air exchange heat,the air-conditioning apparatus further comprises at least one indirect heat exchanger that is connected to a heat medium passage of the intermediate heat exchangers and at which the heat medium and indoor air exchange heat,the first use side heat exchanger is the intermediate heat exchanger, andthe second use side heat exchanger in which the flow rate of the refrigerant is decreased when the heat exchange performance of the first use side heat exchanger is increased is the direct-expansion heat exchanger. 9. An air-conditioning apparatus comprising: a compressor; a heat source side heat exchanger configured to function as a condenser or an evaporator; a plurality of use side heat exchangers each configured to function as a condenser or an evaporator; a plurality of expansion devices each provided for a corresponding one of the plurality of use side heat exchangers, and each configured to adjust a flow rate of a refrigerant that flows through the corresponding one of the plurality of use side heat exchangers; and a controller configured to control an operation capacity of the compressor and opening degrees of the plurality of expansion devices, whereinwhen increasing heat exchange performance of a first use side heat exchanger that is at least one, but not all, of the plurality of use side heat exchangers, the controller increases the operation capacity of the compressor, andcontrols the opening degree of the expansion device corresponding to a second use side heat exchanger that is at least one of the plurality of use side heat exchangers that perform a function identical to a function of the first use side heat exchanger, to decrease a flow rate of the refrigerant that flows through the second use side heat exchanger, the second use side heat exchanger being different from the first use side heat exchanger,the heat source side heat exchanger is configured to function as a condenser, some of the plurality of use side heat exchangers are configured to function as condensers, and some of the rest of the plurality of use side heat exchangers are configured to function as evaporators,the controller controls the operation capacity of the compressor such that evaporating saturation temperatures of the refrigerant that flows through the plurality of use side heat exchangers that function as evaporators become a predetermined evaporating saturation temperature target value,the first use side heat exchanger is configured to function as an evaporator, andwhen increasing the heat exchange performance of the first use side heat exchanger, the controller increases the operation capacity of the compressor by decreasing a value of the evaporating saturation temperature target value,the controller is configured to control the opening degrees of the plurality of expansion devices of the plurality of use side heat exchangers that function as evaporators such that degrees of superheat of the refrigerant that flows through the plurality of use side heat exchangers become a predetermined target degree of superheat, andwhen increasing the heat exchange performance of the first use side heat exchanger, the controller decreases the flow rate in the second use side heat exchanger by increasing the target degree of superheat. 10. The air-conditioning apparatus of claim 9, wherein some of the plurality of use side heat exchangers are intermediate heat exchangers at each of which the refrigerant supplied from the heat source side heat exchanger and a heat medium different from the refrigerant exchange heat,some of the rest of the plurality of use side heat exchangers are direct-expansion heat exchangers at each of which the refrigerant supplied from the heat source side heat exchanger and indoor air exchange heat,the air-conditioning apparatus further comprises at least one indirect heat exchanger which is connected to a heat medium passage of the intermediate heat exchangers and at which the heat medium and indoor air exchange heat,the intermediate heat exchangers include an intermediate heat exchanger configured to function as a condenser and an intermediate heat exchanger configured to function as an evaporator,the first use side heat exchanger is the intermediate heat exchanger connected to the indirect heat exchanger having a larger heat exchange load, andthe second use side heat exchanger in which the flow rate of the refrigerant is decreased when the heat exchange performance of the first use side heat exchanger is increased is the direct-expansion heat exchanger. 11. The air-conditioning apparatus of claim 9, wherein some of the plurality of use side heat exchangers are intermediate heat exchangers at each of which the refrigerant supplied from the heat source side heat exchanger and a heat medium different from the refrigerant exchange heat,some of the rest of the plurality of use side heat exchangers are direct-expansion heat exchangers at each of which the refrigerant supplied from the heat source side heat exchanger and indoor air exchange heat,the air-conditioning apparatus further comprises at least one indirect heat exchanger that is connected to a heat medium passage of the intermediate heat exchangers and at which the heat medium and indoor air exchange heat,the first use side heat exchanger is the intermediate heat exchanger, andthe second use side heat exchanger in which the flow rate of the refrigerant is decreased when the heat exchange performance of the first use side heat exchanger is increased is the direct-expansion heat exchanger.
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이 특허에 인용된 특허 (3)
Lord Richard G. (Liverpool NY), Method and apparatus for controlling a refrigerant expansion valve in a refrigeration system.
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