ROTATION SPEED CONTROL DEVICE, AIR CONDITIONER, AND ROTATION SPEED CONTROL METHOD
First Claim
1. A rotation speed control device for controlling a rotational speed of an outdoor fan that is arranged to send air to an outdoor heat exchanger of a refrigerant circuit in order to enhance for encouraging heat exchange at the outdoor heat exchanger, the rotation speed control device comprising:
- a first control unit configured to execute a first control in order to control the rotational speed of the outdoor fan based on an operation frequency of a compressor of in the refrigerant circuit;
a second control unit configured to execute a second control in order to control the rotational speed of the outdoor fan based on a parameter other than the operation frequency; and
a switching unit configured to execute (24) a switching control in order to switch between the first control and the second control in accordance with to a predetermined switching condition when a cooling mode is being operated and when the outside air temperature is lower than a first temperature.
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Accused Products
Abstract
An outdoor control unit includes a first control unit, a second control unit, and a switching unit. The outdoor control unit controls the rotational speed of an outdoor fan. The first control unit executes a first control for controlling the rotational speed of the outdoor fan based on the operation frequency of the compressor. The second control unit executes a second control for controlling the rotational speed of the outdoor fan based on a parameter other than the operation frequency of the compressor. The switching unit executes a switching control for switching between the first control and the second control according to a predetermined switching condition, when a cooling mode is being operated under a low outside air condition. The low outside air condition refers to a state that the outside air temperature is lower than a first temperature.
18 Citations
19 Claims
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1. A rotation speed control device for controlling a rotational speed of an outdoor fan that is arranged to send air to an outdoor heat exchanger of a refrigerant circuit in order to enhance for encouraging heat exchange at the outdoor heat exchanger, the rotation speed control device comprising:
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a first control unit configured to execute a first control in order to control the rotational speed of the outdoor fan based on an operation frequency of a compressor of in the refrigerant circuit; a second control unit configured to execute a second control in order to control the rotational speed of the outdoor fan based on a parameter other than the operation frequency; and a switching unit configured to execute (24) a switching control in order to switch between the first control and the second control in accordance with to a predetermined switching condition when a cooling mode is being operated and when the outside air temperature is lower than a first temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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9. An air conditioner, comprising:
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a refrigerant circuit having a compressor, an outdoor heat exchanger, expansion valves, and an indoor heat exchanger; an outdoor fan arranged to send air to the outdoor heat exchanger in order to enhance heat exchange at the outdoor heat exchanger; and a rotation speed control unit configured to control a rotational speed of the outdoor fan, the rotation speed control unit including a first control unit configured to execute a first control in order to control the rotational speed based on an operation frequency of the compressor, a second control unit configured to execute a second control in order to control the rotational speed based on a parameter other than the operation frequency, and a switching unit configured to switch a switching control in order to switch between the first control and the second control in accordance with a predetermined switching condition when a cooling mode is being operated and when outside air temperature is lower than a first temperature.
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10. A rotation speed control method for controlling a rotational speed of an outdoor fan arranged to send air to an outdoor heat exchanger of a refrigerant circuit in order to enhance heat exchange at the outdoor heat exchanger, the rotation speed control method comprising:
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controlling the rotational speed based on an operation frequency of a compressor of the refrigerant circuit when a first control is executed; controlling the rotational speed based on a parameter other than the operation frequency when a second control is executed; and switching between executiong of the first control and the second control in accordance with a predetermined switching condition when a cooling mode is being operated and when outside air temperature is lower than a first temperature.
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Specification