JP2018080884A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress deterioration of cooling/heating performance at start of operation in an air conditioner having a heat exchanger for radiation.SOLUTION: An air conditioner 1 includes a heat pump cycle having a compressor 52, an indoor heat exchanger 12 (indoor side heat exchanger), an expansion valve 55 and an outdoor heat exchanger 54 (outdoor side heat exchanger). The heat pump cycle further includes a radiation type heat exchanger 71 as a second indoor side heat exchanger. The radiation type heat exchanger 71 is disposed between the compressor 52 and the indoor heat exchanger 12. The heat pump cycle further includes a bypass route 59 in which a refrigerant flows while bypassing the radiation type heat exchanger 71; and a bypass valve 33 disposed in the bypass route 59. At start of operation of the air conditioner 1, the bypass valve 33 is opened and the refrigerant flows mainly in the bypass route 59.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an air conditioner including an additional heat exchanger for radiation on the indoor side.

  In a conventional air conditioner, warm air is blown from an indoor unit, and the room is heated using convection heat. However, in such an air conditioner, the sound generated by rotating the fan to generate wind becomes noise, which causes problems such as disturbing sleep. Further, in such an air conditioner, there is a problem that uncomfortable feeling such as dry skin or feeling chilly is caused by the warm air of the indoor unit directly hitting a person.

  Therefore, a radiant heat exchanger is provided between the convection indoor heat exchanger using a fan and the outdoor unit, and the indoor heat exchanger and the radiant heat exchanger are used in combination. It has been proposed to heat and cool the room.

  For example, Patent Document 1 discloses a compressor (21), a heat exchanger for indoor radiation (23), a first pressure reducing mechanism (24), an indoor air heat exchanger (25), and a second pressure reducing mechanism ( 26) and an outdoor heat exchanger (27) are sequentially connected, a refrigerant circuit (20) that performs a vapor compression refrigeration cycle by reversibly circulating the refrigerant, the indoor radiant heat exchanger (23), and the indoor An air conditioner including an indoor fan (25F) that supplies room air only to the indoor air heat exchanger (25) of the air heat exchanger (25) is disclosed. The air conditioner of Patent Document 1 includes a bypass passage (28) in the refrigerant circuit (20) in which the refrigerant flows bypassing the indoor radiant heat exchanger (23) and the first pressure reducing mechanism (24). It has been. In the cooling operation, it is described that the refrigerant may flow through the bypass passage (28).

Japanese Patent No. 4923794

  However, in the configuration in which the indoor heat exchanger and the radiant heat exchanger are used in combination as described above, the refrigerant path becomes long, and the cooling / heating performance at the start of operation deteriorates. It becomes. Thereby, in any case of air conditioning, it takes a long time for the indoor temperature to reach a desired temperature (set temperature) at the start of the operation of the air conditioner.

  Therefore, an object of the present invention is to provide an air conditioner that can suppress a decrease in cooling / heating performance at the start of operation in a configuration including a radiant heat exchanger.

  An air conditioner according to one aspect of the present invention includes a compressor that compresses a heat medium, an indoor heat exchanger that functions as a condenser during a cooling operation and also functions as an evaporator during a cooling operation, and depressurizes the heat medium. The heat pump cycle includes an expansion valve that functions as an evaporator during heating operation and an outdoor heat exchanger that functions as a condenser during cooling operation. The heat pump cycle is disposed between a second indoor heat exchanger disposed between the compressor and the indoor heat exchanger, and between the compressor and the indoor heat exchanger, It further includes a bypass path in which the heat medium flows around the second indoor heat exchanger, and a valve disposed in the bypass path. At the start of the operation of the air conditioner, the valve is opened, and the heat medium is configured to flow mainly through the bypass path. The phrase “mainly” the heat medium flows through the bypass path means that more than half of the capacity of the heat medium, more preferably 70% or more, and still more preferably 90% or more flows to the bypass path side.

  As described above, the air conditioner according to the present invention is configured such that the heat medium flows mainly on the bypass path side at the start of operation. Thereby, the path | route of a heat pump cycle can be shortened compared with the case where a heat carrier mainly flows through the 2nd indoor side heat exchanger side. Therefore, in the air conditioner including the second indoor heat exchanger for radiation, it is possible to suppress a decrease in air conditioning performance at the start of operation.

It is a schematic diagram which shows the whole structure of the air conditioner concerning one embodiment of this invention. It is a block diagram which shows the internal structure of the air conditioner concerning one embodiment of this invention. It is a flowchart which shows the flow of control of the air conditioner shown in FIG. This figure shows the flow of processing when the air conditioner starts operation. It is a flowchart which shows the flow of control of the air conditioner shown in FIG. In this figure, an example of the control performed during the air conditioning operation using the radiation heat exchanger in combination is shown. It is a flowchart which shows the flow of control in the air conditioner concerning the 2nd Embodiment of this invention. This figure shows the flow of processing after the air conditioner has started operation. It is a flowchart which shows the flow of control in the air conditioner concerning the 3rd Embodiment of this invention. This figure shows the flow of processing when the air conditioner starts operation. It is a graph which shows the relationship between the last operation stop time and bypass time in the air conditioner concerning the 3rd Embodiment of this invention. It is a flowchart which shows the flow of control in the air conditioner concerning the 4th Embodiment of this invention. This figure shows the flow of processing when the air conditioner starts operation. It is a graph which shows the relationship between the external temperature before the operation start, and bypass time in the air conditioner concerning the 4th Embodiment of this invention. It is a schematic diagram which shows the whole structure of the air conditioner concerning the 5th Embodiment of this invention. It is a schematic diagram which shows the whole structure of the air conditioner concerning the reference form of this invention. It is a block diagram which shows the internal structure of the air conditioner shown in FIG. It is a flowchart which shows the flow of the operation control of the compressor in the air conditioner shown in FIG. It is a flowchart which shows the flow of operation control of the indoor air blower in the air conditioner shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.
[First Embodiment]

  In the first embodiment, an air conditioner including an additional radiation-type heat exchanger (second indoor heat exchanger) in the room will be described as an example. FIG. 1 shows an overall configuration of an air conditioner 1 according to the present embodiment. FIG. 2 shows an internal configuration of the air conditioner 1 according to the present embodiment. In addition, although the air conditioner 1 concerning 1st Embodiment can perform both heating operation and cooling operation, it applies this invention also to the air conditioner which performs only heating operation or cooling operation. Can do.

  As described above, the air conditioner 1 according to the present embodiment includes the radiation heat exchanger (second indoor heat exchanger) in the heat pump cycle. The air conditioner 1 is provided with a bypass path in parallel with the radiant heat exchanger in the heat pump cycle. The bypass path is provided with a bypass valve (valve). At the start of the operation of the air conditioner 1, the bypass valve is controlled to be open or the opening degree is increased. Thereby, when the operation of the air conditioner 1 is started, the refrigerant mainly flows through the bypass path. That is, at the start of the operation of the air conditioner 1, it is controlled so that most of the refrigerant (for example, 90% or more) bypasses the radiant heat exchanger and flows to the bypass path side.

<Overall configuration of air conditioner>
First, an overview of the overall configuration and basic operation of the air conditioner 1 according to the present embodiment will be described with reference to FIG. In FIG. 1, the flow of the refrigerant (heat medium) during the heating operation of the air conditioner 1 is indicated by a solid line arrow, and the flow of the refrigerant (heat medium) during the cooling operation of the air conditioner 1 is indicated by a broken line arrow. Yes.

  As shown in FIG. 1, the air conditioner 1 according to the present embodiment is a separate type air conditioner, and mainly includes an indoor unit 10, an outdoor unit 50, and a radiant heat exchange unit 70. ing. The air conditioner 1 is configured by connecting the indoor unit 10, the outdoor unit 50, and the radiant heat exchange unit 70 via the refrigerant pipe 57 and the refrigerant pipes 58a and 58b. Hereinafter, the outdoor unit 50, the indoor unit 10, the radiant heat exchange unit 70, the refrigerant pipe 57, and the refrigerant pipes 58a and 58b will be described in detail.

(1) Outdoor unit The outdoor unit 50 mainly includes a housing 51, a compressor 52, a four-way valve 53, an outdoor heat exchanger (outdoor heat exchanger) 54, an expansion valve 55, an outdoor blower 56, a refrigerant pipe 57, The refrigerant pipe 58a, the two-way valve 37, and the three-way valve 31 are included. The outdoor unit 50 is installed outdoors.

  The casing 51 includes a compressor 52, a four-way valve 53, an outdoor heat exchanger 54, an expansion valve 55, an outdoor fan 56, a refrigerant pipe 57, a refrigerant pipe 58a, a two-way valve 37, a three-way valve 31, and a compressor temperature sensor 61. , And the outside air temperature sensor 62 and the like are housed.

  The compressor 52 has a discharge pipe 52a and a suction pipe 52b. The discharge pipe 52a and the suction pipe 52b are connected to different connection ports of the four-way valve 53, respectively. During operation, the compressor 52 sucks low-pressure refrigerant gas from the suction pipe 52b, compresses the refrigerant gas to generate high-pressure refrigerant gas, and then discharges the high-pressure refrigerant gas from the discharge pipe 52a.

  The four-way valve 53 is connected to a discharge pipe 52a and a suction pipe 52b of the compressor 52, an outdoor heat exchanger 54, and a radiant heat exchanger 71 through a refrigerant pipe. The four-way valve 53 switches the path of the refrigeration cycle (heat pump cycle) according to a control signal transmitted from the control unit 20 (see FIG. 2) of the air conditioner 1 during operation. That is, the four-way valve 53 switches the path between the cooling operation state and the heating operation state.

  Specifically, in the heating operation state, the four-way valve 53 connects the discharge pipe 52a of the compressor 52 to the radiant heat exchanger 71 and connects the suction pipe 52b of the compressor 52 to the outdoor heat exchanger 54 ( (See solid arrow in FIG. 1). On the other hand, in the cooling operation state, the four-way valve 53 connects the discharge pipe 52a of the compressor 52 to the outdoor heat exchanger 54 and connects the suction pipe 52b of the compressor 52 to the radiant heat exchanger 71 (FIG. 1). (See dashed arrow).

  The outdoor heat exchanger 54 has a large number of radiating fins (not shown) attached to a heat transfer tube (not shown) that is bent back and forth at both left and right ends. The outdoor heat exchanger 54 functions as a condenser during the cooling operation, and functions as an evaporator during the heating operation. In addition, you may use a parallel flow type heat exchanger and a serpent type heat exchanger as a heat exchanger.

  The expansion valve 55 is an electronic expansion valve whose opening degree can be controlled via a stepping motor. One of the expansion valves 55 is connected to the two-way valve 37 via the refrigerant pipe 57 and the other is connected to the outdoor heat exchanger 54. Has been. The stepping motor of the expansion valve 55 operates according to a control signal transmitted from the control unit 20 of the air conditioner 1. The expansion valve 55 depressurizes the high-temperature and high-pressure liquid refrigerant flowing out from the condenser (the indoor heat exchanger 12 during heating and the outdoor heat exchanger 54 during cooling) during operation. At the same time, it plays the role of adjusting the amount of refrigerant supplied to the evaporator (the outdoor heat exchanger 54 during heating and the indoor heat exchanger 12 during cooling).

  The outdoor blower 56 is mainly composed of a propeller fan and a motor. The propeller fan is rotationally driven by a motor and supplies outdoor outdoor air to the outdoor heat exchanger 54. The motor operates in accordance with a control signal transmitted from the control unit 20 of the air conditioner 1.

  The two-way valve 37 is disposed in the refrigerant pipe 57. The two-way valve 37 is closed when the refrigerant pipe 57 is removed from the outdoor unit 50 to prevent the refrigerant from leaking from the outdoor unit 50 to the outside.

  The three-way valve 31 is disposed in the refrigerant pipe 58a. The three-way valve 31 is closed when the refrigerant pipe 58a is removed from the outdoor unit 50, and prevents the refrigerant from leaking from the outdoor unit 50 to the outside. When the refrigerant needs to be recovered from the outdoor unit 50 or from the entire refrigeration cycle including the indoor unit 10 and the radiant heat exchange unit 70, the refrigerant is recovered through the three-way valve 31.

  The compressor temperature sensor 61 measures the temperature of the refrigerant existing in the compressor. The compressor temperature sensor 61 is disposed, for example, in the vicinity of the discharge pipe 52a. Alternatively, the compressor temperature sensor 61 can be disposed near the refrigerant discharge portion in the compressor 52.

  The outside air temperature sensor 62 measures the temperature of the environment where the outdoor unit 50 is installed. The outside air temperature sensor 62 is disposed, for example, in the vicinity of the outside air inlet of the housing 51.

(2) Indoor unit The indoor unit 10 mainly includes a casing 11, an indoor heat exchanger (indoor heat exchanger) 12, an indoor fan (blower) 13, and two two-way valves 35 and 36. ing.

  The housing 11 houses an indoor heat exchanger 12, an indoor blower 13, an indoor heat exchanger temperature sensor 14, an indoor temperature sensor 15, a louver 19, a control unit 20 (see FIG. 2), and the like.

  As shown in FIG. 1, the indoor heat exchanger 12 is a combination of three heat exchangers like a roof (inverted V shape) covering the indoor blower 13. Each heat exchanger has a large number of radiating fins (not shown) attached to a heat transfer tube (not shown) bent back and forth at both left and right ends. These heat exchangers function as a condenser during heating operation and function as an evaporator during cooling operation. An indoor heat exchanger temperature sensor 14 that measures the temperature of the refrigerant passing through the indoor heat exchanger is disposed in the vicinity of the indoor heat exchanger 12 or in the heat transfer pipe of the indoor heat exchanger 12.

  The indoor blower 13 is mainly composed of a cross flow fan and a motor. The cross flow fan is rotationally driven by a motor, sucks indoor air into the housing 11 and supplies the air to the indoor heat exchanger 12, and sends out the air exchanged by the indoor heat exchanger 12 into the room.

  The indoor temperature sensor 15 measures the temperature of the room where the indoor unit 10 is installed. The indoor temperature sensor 15 is disposed, for example, in the vicinity of the outside air inlet of the housing 11.

  The louver 19 is formed of a plate-like member whose angle can be changed. By appropriately changing the angle of the plate member, the air direction of the air sent out by the indoor blower 13 is changed.

  The two-way valve 35 is disposed in the refrigerant pipe 58b. The two-way valve 36 is disposed in the refrigerant pipe 57. The two-way valve 35 is closed when the refrigerant pipe 58b is removed from the indoor unit 10, and prevents the refrigerant from leaking from the indoor unit 10 to the outside. Further, the two-way valve 36 is closed when the refrigerant pipe 57 is removed from the indoor unit 10 to prevent the refrigerant from leaking from the indoor unit 10 to the outside.

(3) Radiation type heat exchange unit In this embodiment, the radiation type heat exchanger 71 is provided as a unit different from the indoor unit 10. The radiant heat exchange unit 70 is disposed indoors. The radiant heat exchange unit 70 mainly includes a radiant heat exchanger 71 (second indoor heat exchanger), a casing 72, a bypass path 59, a bypass valve (valve) 33, and two two-way valves. It consists of 32 and 34.

  The radiant heat exchanger 71 is provided between the indoor heat exchanger 12 and the compressor 52 in the heat pump cycle. The radiant heat exchanger 71 includes a heat transfer pipe (refrigerant pipe) through which a refrigerant passes, a radiant panel, and the like. The heat transfer pipe extends from one end of the housing 72 to the other end while meandering in a predetermined plane direction. The radiation panel is arranged on a surface where the heat transfer pipe extends while meandering. Or the radiation panel adjoins to the surface where heat-transfer piping extends while meandering, and is arrange | positioned in parallel with the surface. Thereby, warm air or cold air from the refrigerant passing through the heat transfer pipe can be radiated indoors.

  The housing 72 houses a radiant heat exchanger 71, a bypass path 59, a bypass valve 33, and the like. Note that the radiation panel may be exposed on the surface of the housing 72.

  The bypass path 59 is provided between the indoor heat exchanger 12 and the compressor 52 in the refrigeration cycle. The bypass path 59 has a refrigerant pipe through which the refrigerant passes. The refrigerant pipe is substantially straight and extends from one end portion in the housing 72 to the other end portion. As shown in FIG. 1, the refrigerant pipe of the bypass path 59 is arranged in parallel with the heat transfer pipe of the radiant heat exchanger 71.

  The bypass valve 33 is disposed in the bypass path 59. The bypass valve 33 is composed of, for example, an electromagnetic valve, and the opening / closing control is performed based on a command from the control unit 20 (see FIG. 2). The bypass valve 33 can also adjust the flow rate of the refrigerant flowing in the bypass path 59 by adjusting the opening degree thereof. Thus, when the bypass valve 33 is fully opened, the refrigerant mainly flows through the bypass path 59 (for example, 90% or more of the total amount). At this time, the refrigerant hardly flows to the radiation heat exchanger 71 side. On the other hand, when the bypass valve 33 is fully closed, the refrigerant mainly flows through the heat transfer pipe of the radiant heat exchanger 71 (for example, 90% or more of the total amount).

  The bypass valve 33 may be configured to be fully closed and fully open, or may be capable of finely controlling the opening degree. When a valve that can be finely controlled is used, the flow rate of refrigerant flowing through the bypass path 59 and the flow rate of refrigerant flowing to the heat transfer pipe of the radiant heat exchanger 71 can be controlled more finely. This configuration may be applied to second to fifth embodiments described later.

  In addition, it replaces with the bypass valve 33, and the flow path of a refrigerant | coolant is provided by providing a refrigerant flow path switching valve in the location (2 locations in this embodiment) where the bypass pathway 59 and the heat transfer piping of the radiant heat exchanger 71 intersect. The structure which controls this may be sufficient. This configuration may be applied to second to fifth embodiments described later.

  The two-way valve 32 is disposed in the refrigerant pipe 58a. The two-way valve 34 is disposed in the refrigerant pipe 58b. The two-way valve 32 is closed when the refrigerant pipe 58 a is removed from the radiant heat exchange unit 70 to prevent the refrigerant from leaking from the radiant heat exchange unit 70 to the outside. The two-way valve 34 is closed when the refrigerant pipe 58 b is removed from the radiant heat exchange unit 70 to prevent the refrigerant from leaking from the radiant heat exchange unit 70 to the outside.

(4) Refrigerant piping The refrigerant piping 57 is thinner than the refrigerant piping 58a and 58b, and a liquid refrigerant or a gas-liquid two-phase refrigerant flows during operation. The refrigerant pipes 58a and 58b are pipes thicker than the refrigerant pipe 57, and a gas refrigerant or a gas-liquid two-phase refrigerant flows during operation. The radiant heat exchange unit 70 is disposed between the refrigerant pipe 58a and the refrigerant pipe 58b through which the gas refrigerant or the gas-liquid two-phase refrigerant flows.

  A compressor 52, a four-way valve 53, an outdoor heat exchanger 54 and an expansion valve 55 in the outdoor unit 50, an indoor heat exchanger 12 in the indoor unit 10, and a radiant heat exchanger 71 in the radiant heat exchange unit 70 are The refrigerant pipes 57, 58a and 58b are sequentially connected to constitute a refrigeration cycle.

<Basic operation of the air conditioner>
Hereinafter, the heating operation and the cooling operation of the air conditioner 1 according to the present embodiment will be described in detail.

(1) Heating operation In the heating operation, the four-way valve 53 is in the state indicated by the solid line in FIG. 1, that is, the discharge pipe 52 a of the compressor 52 is connected to the radiant heat exchanger 71 and the suction pipe of the compressor 52. 52b is connected to the outdoor heat exchanger 54. At this time, the two-way valves 32, 34, 35, 36, and 37 and the three-way valve 31 are opened. When the compressor 52 is started in this state, the gas refrigerant is sucked into the compressor 52 and compressed, and then the indoor heat exchange is performed from the radiant heat exchanger 71 via the four-way valve 53 and the three-way valve 31. It is supplied to the vessel 12 to heat the room air and condense it into a liquid refrigerant. Thereafter, the liquid refrigerant is sent to the expansion valve 55 via the two-way valve 37 and is decompressed to be in a gas-liquid two-phase state. The gas-liquid two-phase refrigerant is sent to the outdoor heat exchanger 54 and evaporated in the outdoor heat exchanger 54 to become a gas refrigerant. Finally, the gas refrigerant is sucked into the compressor 52 again via the four-way valve 53.

  The heating operation described here means a normal heating operation other than immediately after the start of the operation of the air conditioner 1 described later. During this normal heating operation, the bypass valve 33 is closed. Therefore, the refrigerant mainly flows to the radiant heat exchanger 71.

(2) Cooling operation In the cooling operation, the four-way valve 53 is in the state indicated by the broken line in FIG. 1, that is, the discharge pipe 52 a of the compressor 52 is connected to the outdoor heat exchanger 54 and the suction pipe 52 b of the compressor 52. Is connected to the radiant heat exchanger 71. At this time, the two-way valves 32, 34, 35, 36, and 37 and the three-way valve 31 are opened. In this state, when the compressor 52 is started, the gas refrigerant is sucked into the compressor 52 and compressed, and then sent to the outdoor heat exchanger 54 via the four-way valve 53, and the outdoor heat exchanger 54. Is cooled to become a liquid refrigerant. Thereafter, this liquid refrigerant is sent to the expansion valve 55, where it is depressurized and enters a gas-liquid two-phase state. The refrigerant in the gas-liquid two-phase state is supplied from the indoor heat exchanger 12 to the radiant heat exchanger 71 via the two-way valve 37, cools the indoor air and evaporates to become a gas refrigerant. Finally, the gas refrigerant is sucked into the compressor 52 again via the three-way valve 31 and the four-way valve 53.

  In addition, the air_conditionaing | cooling operation demonstrated here means the normal air_conditionaing | cooling operation other than immediately after the operation start of the air conditioner 1 mentioned later. During this normal cooling operation, the bypass valve 33 is closed. Therefore, the refrigerant mainly flows to the radiant heat exchanger 71.

(3) Defrosting operation During heating operation, the outdoor heat exchanger 54 may be frosted and the heat exchange capability may be reduced. Therefore, the control unit 20 (see FIG. 2) determines whether or not the outdoor heat exchanger 54 is frosted based on the temperature from the outdoor heat exchanger temperature sensor (not shown). When it is determined that frost has been formed, the control unit 20 performs defrosting by switching the four-way valve 53 and performing the above-described cooling operation (reverse defrosting). In addition, the control part 20 determines whether the frost of the outdoor heat exchanger 54 was removed appropriately based on the temperature which the outdoor heat exchanger temperature sensor measured.

  During the defrosting operation, the bypass valve 33 in the radiant heat exchange unit 70 may be in a closed state or an open state.

<Control at the start of operation>
Subsequently, a control method of the bypass valve 33 and the compressor 52 when the air conditioner 1 according to the present embodiment starts the heating operation or the cooling operation will be described with reference to FIGS. 1 to 3. In FIG. 2, the internal structure of the air conditioner 1 is shown.

  As shown in FIG. 2, the indoor unit 10 includes an indoor fan 13, an indoor heat exchanger temperature sensor 14, an indoor temperature sensor 15, a display unit 16, a receiving unit 17, a louver 19, and a control unit 20. ing. Further, the air conditioner 1 is provided with a remote controller (operation unit) 18 as a component different from the indoor unit 10.

  The display unit 16 includes a liquid crystal display panel, an LED light, and the like. The display unit 16 displays the operation status and alarms of the air conditioner 1 based on the signal from the control unit 20. The receiving unit 17 receives an infrared signal transmitted when the remote controller 18 is operated. The remote controller 18 functions as an operation unit for the user to operate the air conditioner 1. For example, the user can select the operation mode, the set temperature, and the like of the air conditioner 1 by operating the remote controller 18.

  The control unit 20 is connected to each component in the air conditioner 1 and performs these controls. In the control unit 20, a bypass valve control unit 21, a compressor control unit 22, an indoor fan control unit 23, a storage unit 25, a timer 26, and the like are provided. The bypass valve control unit 21 controls the opening / closing operation of the bypass valve 33. The compressor control unit 22 performs control such as operation start, operation stop, and rotation speed change of the compressor 52. The indoor blower control unit 23 performs control such as operation start, operation stop, and rotation speed change of the indoor blower 13.

  The storage unit 25 includes a ROM (read only memory) and a RAM (Random Access Memory). The storage unit 25 stores an operation program and setting data of the air conditioner 1 and temporarily stores a calculation result by the control unit 20.

  The timer 26 measures the time of processing performed in the control unit 20 and the operation time of each component in the air conditioner 1 as necessary. The timer 26 also has a clock function.

  Further, as described above, the outdoor unit 50 is provided with the compressor 52, the outdoor blower 56, the outside air temperature sensor 62, the compressor temperature sensor 61, and the like.

  Further, as described above, the radiant heat exchange unit 70 includes the bypass valve 33 and the like.

(Control of bypass valves at the start of air conditioning operation)
FIG. 3 shows a flow of control when the air conditioner 1 starts operation (specifically, control of the bypass valve 33, the indoor blower 13, the compressor 52, etc.). First, a user operates a remote controller or the like to give an instruction to start a heating operation or a cooling operation to the air conditioner 1. At this time, the user inputs a desired temperature (set temperature) during the heating operation or the cooling operation from the operation unit 18. Thus, the user can directly input a desired temperature as the set temperature. Alternatively, the target temperature assigned to the selected operation mode can be set as the set temperature by the user selecting one of various operation modes.

  The receiving unit 17 of the air conditioner 1 receives this instruction, and transmits a signal instructing the control unit 20 to start operation. When the control unit 20 receives this signal, it sends a command for starting the operation to each unit (for example, the compressor 52, each blower 13, 56, etc.) in the air conditioner 1.

  Specifically, when the bypass valve control unit 21 in the control unit 20 receives the operation start instruction signal, the bypass valve control unit 21 opens the bypass valve 33 in the radiant heat exchange unit 70 (step S1). When the bypass valve 33 is opened, the refrigerant in the refrigeration cycle is mainly in the bypass path 59 (that is, the path indicated by the arrow A1 in FIG. 1 during the heating operation and the path indicated by the arrow A2 in the cooling operation). Flowing.

  Thereafter, when the air conditioner 1 continues to operate, the indoor temperature (room temperature) gradually approaches the set temperature. When the difference between the set temperature and the room temperature is equal to or higher than a predetermined temperature X1 (for example, X1 can be within the range of 3 ° C. to 5 ° C.) (NO in step S2), the control unit 20 bypasses The valve 33 is kept open. As a result, the refrigeration cycle continues to operate with refrigerant mainly flowing through the bypass path 59.

  When the difference between the set temperature and room temperature becomes smaller than the predetermined temperature X1 (predetermined value) (YES in step S2), the control unit 20 operates the bypass valve 33 from the open state to the closed state (step S3). ). As a result, the refrigeration cycle shifts from a state in which the refrigerant mainly flows in the bypass path 59 to a state in which the refrigerant mainly flows in the radiant heat exchanger 71. That is, the operation using the radiation heat exchanger 71 together (that is, the operation in which the refrigerant flows through the route indicated by arrow B1 in FIG. 1 during the heating operation and the route indicated by arrow B2 in FIG. 1 during the cooling operation) is started. (Step S4).

  When the operation using the radiant heat exchanger 71 is started, the indoor heat exchanger 12 and the radiant heat exchanger 71 can be used together to perform indoor air conditioning. At this time, the indoor blower control unit 23 in the control unit 20 performs control so as to reduce the rotational speed of the indoor blower 13 (step S5). Accordingly, the sound of the blower can be suppressed to a lower level by reducing the number of rotations of the indoor blower 13 while air-conditioning the room so that the room is maintained at a desired temperature using the radiant heat of the radiant heat exchanger 71. The air volume from can be kept small. Therefore, it can suppress that the sound of a fan becomes noise and disturbs sleep. Moreover, it can suppress that discomfort that a skin feels dry or chilly by the wind of a blower hitting a person directly is produced.

  In step S5, the indoor blower control unit 23 can completely stop the operation of the indoor blower 13 instead of reducing the rotational speed of the indoor blower 13. When the control unit 20 determines that the nighttime operation is performed using the clock function of the timer 26, the indoor fan control unit 23 stops the operation of the indoor fan 13, and the control unit 20 operates during the daytime. If it judges that it is in, the indoor air blower control part 23 may perform control which reduces the rotation speed of the indoor air blower 13. FIG.

  Moreover, when the air conditioner 1 starts operation, the control unit 20 controls the cooling / heating capacity based on the temperature (room temperature) measured by the indoor temperature sensor 15. That is, in the initial setting, the compressor control unit 22 in the control unit 20 controls the rotation speed of the compressor 52 based on the temperature (room temperature) measured by the indoor temperature sensor 15.

  Although not shown in the flowchart of FIG. 3, when the difference between the set temperature and the room temperature becomes an arbitrary predetermined value or more, the control unit 20 again causes the indoor heat exchanger 12 to perform the main operation. Control. That is, the bypass valve control unit 21 shifts the bypass valve 33 from the closed state to the open state. Thereby, since the refrigerant mainly flows through the bypass path 59, the room temperature can be brought closer to the set temperature in a shorter time compared to the case where the refrigerant is passed to the radiation heat exchanger 71 side.

  By the way, when the operation control of the compressor 52 is performed based on the room temperature during the cooling / heating operation using the radiation heat exchanger 71 together, there arises a problem that the rotational speed of the compressor 52 is excessively decreased. When the rotational speed of the compressor 52 decreases more than necessary, the surface temperature of the radiant heat exchanger 71 decreases during the heating operation and increases during the cooling operation. Thereby, the air conditioner 1 cannot secure a desired air conditioning capability (cooling / heating capability), and the difference between the indoor temperature and the set temperature may become large again. When the difference between the room temperature and the set temperature is increased again, the air conditioner 1 causes the indoor heat exchanger 12 to shift to the main operation again.

  However, it is possible to avoid that the indoor heat exchanger 12 shifts to the main operation in a short time from the operation using the radiation heat exchanger 71 in this manner from the viewpoint of user comfort. desirable. Therefore, in the air conditioner 1 of the present embodiment, the control as shown in FIG. 4 is performed so that the temperature change in the room after the operation using the radiation heat exchanger 71 is started is further reduced.

  Steps S3 and S4 shown in the flowchart shown in FIG. 4 are the same as the steps shown in the flowchart of FIG. When the operation using the radiation heat exchanger 71 is started (step S4), the control unit 20 determines that the difference between the set temperature and the room temperature is a second predetermined temperature X2 (where X2 is equal to or less than X1). It is confirmed whether or not X2 is smaller than, for example, within a range of 1 ° C. to 3 ° C. (step S15).

  If the difference between the set temperature and the room temperature is equal to or higher than the predetermined temperature X2 (second predetermined value) (NO in step S15), the initial setting state is maintained, and the compressor control in the control unit 20 is controlled. The unit 22 controls the rotation speed of the compressor 52 based on the room temperature (step S16).

  On the other hand, when the difference between the set temperature and the room temperature becomes smaller than the predetermined temperature X2 (YES in step S15), the compressor control unit 22 in the control unit 20 compresses based on the refrigerant temperature of the indoor heat exchanger 12. The number of revolutions of the machine 52 is controlled (step S17). The refrigerant temperature of the indoor heat exchanger 12 can be measured by, for example, the indoor heat exchanger temperature sensor 14.

  After the process of step S16 and step S17 is complete | finished, it returns to step S15 again, and it is monitored whether the difference of preset temperature and room temperature is smaller than predetermined temperature X2.

  As described above, the above control is continuously performed during the operation using the radiation heat exchanger 71 together. By performing such control, operation control according to the temperature change of the refrigerant in the indoor heat exchanger 12 can be performed. Thereby, the temperature fall at the time of the heating operation which used the radiation type heat exchanger 71 together, or the temperature rise at the time of the heating operation which used the radiation type heat exchanger 71 together can be suppressed. Therefore, a large change in room temperature when the indoor heat exchanger 12 is shifted from the main operation to an operation using the radiant heat exchanger 71 can be suppressed.

  Further, during the operation using the radiant heat exchanger 71 in combination, the rotational speed of the indoor blower 13 is kept low. Therefore, there is a possibility that the room temperature sensor 15 is difficult to detect the accurate room temperature. However, by performing the control shown in FIG. 4, it is possible to grasp the current operation state more accurately and perform a comfortable air conditioning operation even during operation using the radiation heat exchanger 71 together.

  As described above, in the air conditioner 1 of the present embodiment, the bypass valve 33 is opened at the start of operation, and the refrigerant in the refrigeration cycle mainly flows in the bypass path 59. The bypass path 59 has a shorter pipe length than the refrigerant pipe in the radiant heat exchanger 71. For this reason, when the operation is started, the refrigerant is passed through the bypass path 59 having a shorter length of the pipe, whereby the cooling / heating start-up performance at the start of the operation can be improved. That is, it can approach the set temperature (desired temperature) input by the user in a shorter time.

  In the above-described embodiment, the method for controlling the rotational speed of the compressor is determined based on whether or not the difference between the set temperature and the room temperature is smaller than the second predetermined temperature X2 (here, X2 ≦ X1). It is different. However, in one aspect of the present invention, the method for controlling the rotational speed of the compressor may be made different depending on whether or not the difference between the set temperature and the room temperature is smaller than the predetermined temperature X1. That is, when the difference between the set temperature and the room temperature becomes smaller than the predetermined temperature X1, the bypass valve 33 is closed, and the rotation speed of the compressor 52 is set based on the refrigerant temperature of the indoor heat exchanger 12. You may make it control.

[Second Embodiment]
In the first embodiment described above, when the bypass valve 33 is closed and the operation using the radiant heat exchanger 71 is started, control is performed to reduce the rotational speed of the indoor blower 13. However, in the air conditioner according to the embodiment of the present invention, the indoor blower 13 can be controlled by a different method during the operation using the radiation heat exchanger 71 together. Therefore, in the second embodiment, a configuration in which the indoor fan 13 is controlled by a method different from the first embodiment will be described.

  About the whole structure of the air conditioner 1 concerning this embodiment, the structure similar to the air conditioner concerning 1st Embodiment is applicable. Therefore, detailed description regarding the configuration of the air conditioner 1 according to the present embodiment is omitted.

(Control of indoor blower during operation using radiant heat exchanger)
FIG. 5 shows a flow of control when the air conditioner 1 starts operation (specifically, control of the bypass valve 33 and the indoor blower 13). First, the user operates a remote controller or the like to give an instruction to start the heating operation or the cooling operation to the air conditioner 1. At this time, the user inputs a desired temperature (set temperature) during the heating operation or the cooling operation from the operation unit 18. At this time, the target temperature assigned to the selected operation mode can be set as the set temperature by the user selecting one of the various operation modes.

  The receiving unit 17 of the air conditioner 1 receives this instruction, and transmits a signal instructing the control unit 20 to start operation. When the control unit 20 receives this signal, it sends a command for starting the operation to each unit (for example, the compressor 52, each blower 13, 56, etc.) in the air conditioner 1.

  And control of the bypass valve 33 at the time of a driving | operation start is performed similarly to the air conditioner 1 of 1st Embodiment. That is, the control from step S1 to step S4 shown in FIG. 5 is performed similarly to step S1 to step S4 shown in FIG.

  When the operation using the radiation heat exchanger 71 is started (step S4), the control unit 20 determines that the difference between the set temperature and the room temperature is a third predetermined temperature X3 (where X3 is greater than X1). It is also confirmed whether or not X3 has become smaller than, for example, within a range of 1 ° C. to 3 ° C. (step S25).

  When the difference between the set temperature and the room temperature is equal to or higher than the predetermined temperature X3 (third predetermined value) (NO in step S25), the indoor fan control unit 23 in the control unit 20 operates the indoor fan 13. Is continued (step S27). Note that, in the operation of the indoor blower 13 here, control may be performed so as to reduce the rotational speed, similarly to step S5 (see FIG. 3) of the first embodiment described above.

  On the other hand, when the difference between the set temperature and the room temperature becomes smaller than the predetermined temperature X3 (YES in step S25), the indoor fan control unit 23 stops the operation of the indoor fan 13 (step S26).

  After performing the control as described above, the indoor fan control unit 23 may end the control of the indoor fan 13. Or it returns to step S25 again, and the control part 20 continues monitoring whether the difference of temperature and room temperature is smaller than the predetermined temperature X3, and the indoor air blower control part 23 is an indoor air blower based on the monitoring result. You may perform thirteen operation control.

  By performing such control, the operation state of the indoor blower 13 can be changed according to the difference between the set temperature and the room temperature. Thereby, more comfortable air conditioning operation can be performed.

[Third Embodiment]
Subsequently, a third embodiment of the present invention will be described. In the third embodiment, the control method of the bypass valve 33 provided in the radiant heat exchange unit 70 is different from the first and second embodiments. That is, in the air conditioner 1 according to the third embodiment, the longer the operation stop time of the air conditioner 1 before the operation is started, the longer the time for mainly flowing the refrigerant through the bypass path 59 is controlled. About the whole structure of the air conditioner 1 concerning 3rd Embodiment, the structure similar to the air conditioner concerning 1st Embodiment is applicable. Therefore, detailed description regarding the configuration of the air conditioner 1 according to the present embodiment is omitted.

(Control of bypass valves at the start of air conditioning operation)
FIG. 6 shows a control flow of the bypass valve 33 when the air conditioner 1 according to the third embodiment starts operation. First, the user operates a remote controller or the like to give an instruction to start the heating operation or the cooling operation to the air conditioner 1. At this time, the user inputs a desired temperature (set temperature) during the heating operation or the cooling operation from the operation unit 18. At this time, the target temperature assigned to the selected operation mode can be set as the set temperature by the user selecting one of the various operation modes.

  The receiving unit 17 of the air conditioner 1 receives this instruction, and transmits a signal instructing the control unit 20 to start operation. When the control unit 20 receives this signal, it sends a command for starting the operation to each unit (for example, the compressor 52, each blower 13, 56, etc.) in the air conditioner 1.

  Further, the control unit 20 in the air conditioner 1 acquires information on the duration of the operation stop state (immediate operation stop time) immediately before the air conditioner 1 starts operation from the timer 26 (step S31). . Thus, the timer 26 also has a function of starting counting after the air conditioner 1 stops operation. Then, the control unit 20 determines a time for opening the bypass valve 33 at the start of operation (this time is referred to as “bypass time”) based on the acquired “immediate operation stop time” (step S32).

  The determination of the bypass time here can be performed using, for example, a graph as shown in FIG. The graph shown in FIG. 7 is a graph showing the relationship between the previous operation stop time (minutes) and the bypass time (minutes). The graph shown in FIG. 7 is stored in the storage unit 25 in the control unit 20. The control unit 20 selects the bypass time t2 associated with the acquired “immediate operation stop time” t1 as the bypass time with reference to the graph of FIG. As shown in FIG. 7, the “bypass time” is set to become longer as the “immediate operation stop time” becomes longer.

  Note that the storage unit 25 may store a table in which “immediate operation stop time” and “bypass time” are associated with each other instead of the graph (function formula) as shown in FIG.

  After determining the bypass time, the control unit 20 opens the bypass valve 33 (step S33) and operates the air conditioner 1. When the air conditioner 1 operates, the timer 26 starts measuring the bypass time (step S34). Thereby, the air conditioner 1 first performs the air conditioning operation in the refrigeration cycle in which the refrigerant mainly passes through the bypass path 59. When the bypass time determined in step S32 is reached (YES in step S35), the control unit 20 operates the bypass valve 33 from the open state to the closed state (step S36).

  Even after the bypass time has elapsed in step S35, if the difference between the set temperature and the room temperature is equal to or higher than a predetermined temperature (for example, X1 in the first embodiment), the bypass valve 33 is continuously opened to set the set temperature. When the difference between the temperature and the room temperature becomes smaller than a predetermined temperature (for example, X1 in the first embodiment), the bypass valve 33 may be controlled to be closed. By doing in this way, it can approach the preset temperature (desired temperature) which the user input in a shorter time.

  When the bypass valve 33 is closed, the operation using the radiation heat exchanger 71 is started (step S37). Thereafter, the operations of the compressor 52 and the indoor blower 13 can be controlled by the same method as in the first embodiment or the second embodiment.

  As described above, the air conditioner 1 of the present embodiment can pass the refrigerant through the bypass path having a shorter pipe length by opening the bypass valve at the start of operation. Thereby, the start-up performance of the air conditioning at the time of an operation start can be improved. Moreover, in the air conditioner 1 of this embodiment, the time which makes a bypass valve an open state can be determined based on the time when the air conditioner 1 has stopped driving | operation before a driving | operation start.

  Note that the control of the bypass valve 33 described in the third embodiment is preferably performed when the outside air temperature is low, such as in winter. Under an environment where the outside air temperature is low and the temperature difference between the room and the room is large, when the air conditioner 1 is stopped for a long time, the refrigerant easily collects in the compressor 52, and the refrigerant inside the compressor 52 becomes lubricating oil. May melt. Thus, the state in which the refrigerant is dissolved in the lubricating oil of the compressor 52 is referred to as a “sleeping state of the compressor”. When this stagnation occurs, the lubricating oil inside the compressor is discharged out of the compressor together with the refrigerant when the compressor is started, and the lubricating oil in the compressor is reduced and the oil level is lowered, resulting in poor lubrication. There is a possibility that.

  Therefore, when the outside air temperature at which the compressor may stagnate is low, the above-described bypass valve 33 is controlled. Thereby, when the operation of the air conditioner 1 is started, the bypass valve 33 is opened, and the refrigerant can be circulated through the bypass path 59 having a shorter path. During the bypass time, the indoor heat exchanger 12 can perform the main air conditioning operation with the bypass valve 33 opened. Thereby, the refrigerant path of the refrigeration cycle is shortened, and the refrigerant discharged from the compressor 52 is easily returned to the compressor 52. Therefore, it is possible to suppress a decrease in the performance of the compressor 52.

  In addition, the longer the compressor is in the stagnation state, the greater the amount of refrigerant dissolved in the lubricating oil. Therefore, by determining the bypass time based on the previous operation stop time, it is possible to perform control according to the high necessity of bypassing the refrigerant.

  In the present invention, the control of the bypass valve 33 according to the first embodiment and the control of the bypass valve 33 according to the third embodiment can be used in combination. For example, it is possible to determine whether to perform the control described in the first embodiment or the control described in the third embodiment according to the outside air temperature at the start of operation. The control of the bypass valve 33 described in the third embodiment is preferably performed when the outside air temperature is low. For example, when the outside air temperature at the start of operation is less than an arbitrary threshold, the third embodiment The control described in the first embodiment is preferably performed when the outside air temperature at the start of operation is equal to or greater than an arbitrary threshold value.

[Fourth Embodiment]
In the third embodiment described above, the example in which the control unit 20 determines the “bypass time” based on the “previous operation stop time” has been described. In addition to this, in the present invention, a configuration in which the “bypass time” is determined based on the “outside temperature during operation stop” is also possible. Therefore, in the fourth embodiment, based on the outside air temperature during the operation stop of the air conditioner (before the air conditioner 1 starts operation), the time for flowing the refrigerant mainly in the bypass path 59 (“bypass time”) A configuration example for determining the above will be described.

  About the whole structure of the air conditioner 1 concerning 4th Embodiment, the structure similar to the air conditioner concerning 1st Embodiment is applicable. Therefore, detailed description regarding the configuration of the air conditioner 1 according to the present embodiment is omitted.

(Control of bypass valves at the start of air conditioning operation)
FIG. 8 shows a control flow of the bypass valve 33 when the air conditioner 1 according to the fourth embodiment starts operation. First, the user operates a remote controller or the like to give an instruction to start the heating operation or the cooling operation to the air conditioner 1. At this time, the user inputs a desired temperature (set temperature) during the heating operation or the cooling operation from the operation unit 18. At this time, the target temperature assigned to the selected operation mode can be set as the set temperature by the user selecting one of the various operation modes.

  The receiving unit 17 of the air conditioner 1 receives this instruction, and transmits a signal instructing the control unit 20 to start operation. When the control unit 20 receives this signal, it sends a command for starting the operation to each unit (for example, the compressor 52, each blower 13, 56, etc.) in the air conditioner 1.

  Furthermore, the control unit 20 in the air conditioner 1 acquires information on the outside air temperature (“outside temperature during operation stop”) in the operation stop state immediately before the air conditioner 1 starts operation from the outside air temperature sensor 62. (Step S41). Here, the “outside air temperature during operation stop” means the outside air temperature in a predetermined time zone immediately before the operation stop state before the operation start (for example, a time zone within a range of 1 to 3 hours immediately before the operation start). Means the average.

  Based on the acquired “outside air temperature during operation stop”, the control unit 20 determines a time for opening the bypass valve 33 at the start of operation (this time is referred to as “bypass time”) (step S42). .

  The determination of the bypass time here can be performed using, for example, a graph as shown in FIG. The graph shown in FIG. 9 is a graph showing the relationship between the outside air temperature (° C.) and the bypass time (minutes) during operation stop. The graph shown in FIG. 9 is stored in the storage unit 25 in the control unit 20. With reference to FIG. 9, the control unit 20 selects the bypass time d <b> 2 associated with the acquired “outside temperature during operation stop” d <b> 1 as the bypass time. As shown in FIG. 9, the “bypass time” is set to be longer as the “outside air temperature during operation stop” is lower.

  The storage unit 25 may store a table in which “outside temperature during operation stop” and “bypass time” are associated with each other instead of the graph (function formula) as shown in FIG. .

  After determining the bypass time, the control unit 20 opens the bypass valve 33 (step S43) and operates the air conditioner 1. About the process after this, operation | movement of the bypass valve 33, the compressor 52, the indoor air blower 13, etc. can be controlled by the method similar to 1st-3rd embodiment. Note that the processing from step S43 to step S47 shown in FIG. 8 corresponds to the processing from step S33 to step S37 shown in FIG.

  Even after the bypass time has elapsed in step S45, if the difference between the set temperature and the room temperature is equal to or higher than a predetermined temperature (for example, X1 in the first embodiment), the bypass valve 33 is continuously opened and the set temperature is set. When the difference between the temperature and the room temperature becomes smaller than a predetermined temperature (for example, X1 in the first embodiment), the bypass valve 33 may be controlled to be closed. By doing in this way, it can approach the preset temperature (desired temperature) which the user input in a shorter time.

  As described above, the air conditioner 1 of the present embodiment can pass the refrigerant through the bypass path having a shorter pipe length by opening the bypass valve at the start of operation. Thereby, the start-up performance of the air conditioning at the time of an operation start can be improved. Moreover, in the air conditioner 1 of this embodiment, the time which makes a bypass valve open can be determined based on the external temperature during operation stop.

  The lower the outside air temperature during shutdown, the greater the amount of refrigerant dissolved in the lubricating oil of the compressor. Therefore, by determining the bypass time based on the outside air temperature during operation stop, it is possible to perform control according to the high necessity of bypassing the refrigerant.

  In the fourth embodiment described above, the control unit 20 determines the “bypass time” based on the “outside temperature during operation stop”. However, as another embodiment, the “bypass time” may be determined based on the temperature of the refrigerant in the compressor 52 during the operation stop of the air conditioner 1 before the start of operation. The temperature of the refrigerant in the compressor 52 during operation varies according to a change in the outside air temperature. That is, when the outside air temperature decreases, the temperature of the refrigerant in the compressor 52 also decreases. Therefore, as in the fourth embodiment, the “bypass time” may be increased as the refrigerant temperature in the compressor 52 is lower (see FIG. 9).

[Fifth Embodiment]
Next, a fifth embodiment will be described with reference to FIG. In the first to fourth embodiments described above, the example in which the indoor unit 10 and the radiant heat exchange unit 70 are configured as separate units has been described. However, the present invention is not limited to such a configuration, and the indoor unit 10 and the radiant heat exchange unit 70 may be configured as a single unit. Therefore, in the fifth embodiment, a configuration example in which the radiant heat exchange unit 170 is arranged in the casing 111 of the indoor unit 110 will be described.

  In FIG. 10, the whole structure of the air conditioner 100 concerning this embodiment is shown. As shown in FIG. 10, an air conditioner 100 according to the present embodiment is a separate type air conditioner, and mainly includes an indoor unit 10 and an outdoor unit 50. The indoor unit 10 and the outdoor unit 50 are connected via a refrigerant pipe 57 and a refrigerant pipe 58a.

(1) Outdoor unit The outdoor unit 50 mainly includes a housing 51, a compressor 52, a four-way valve 53, an outdoor heat exchanger (outdoor heat exchanger) 54, an expansion valve 55, an outdoor blower 56, a refrigerant pipe 57, The refrigerant pipe 58a, the two-way valve 37, and the three-way valve 31 are included. About the outdoor unit 50, the structure similar to the structure demonstrated in 1st Embodiment is applicable.

(2) Indoor unit The indoor unit 110 mainly includes a casing 111, an indoor heat exchanger (indoor heat exchanger) 12, an indoor fan (blower) 13, a radiant heat exchanger 170, and four two-way units. It consists of valves 32, 34, 35 and 36.

  A configuration similar to the configuration described in the first embodiment can be applied to the indoor heat exchanger (indoor heat exchanger) 12, the indoor blower (blower) 13, and the two two-way valves 35 and 36.

  The radiant heat exchanger 170 includes a radiant heat exchanger heat transfer pipe 171 (hereinafter simply referred to as a heat transfer pipe 171), a bypass path 159, a bypass valve (valve) 133, and the like. In the present embodiment, together with the indoor heat exchanger 12, the radiant heat exchange unit 170 and the two two-way valves 32 and 34 are also arranged in the housing 111.

  In the case of the present embodiment, the indoor heat exchanger 12 and the radiant heat exchanging unit 170 are disposed in the casing 111, so that the two-way valves 34 and 35 may be omitted. In this case, the two-way valve 36 is disposed in the refrigerant pipe 57, and the two-way valve 32 is disposed in the refrigerant pipe 58a. The two-way valve 36 is closed when the refrigerant pipe 57 is removed from the indoor unit 110, the two-way valve 32 is closed when the refrigerant pipe 58 a is removed from the indoor unit 110, and the refrigerant is removed from the indoor unit 110. Prevent leakage to the outside.

  The heat transfer pipe 171 for the radiant heat exchanger can be applied with the same configuration as the heat transfer pipe constituting the radiant heat exchanger 71 described in the first embodiment. Similar to the first embodiment, a radiation panel may be provided in the vicinity of the heat transfer pipe. The bypass path 159 and the bypass valve (valve) 133 can be configured in the same manner as the bypass path 59 and the bypass valve 33 described in the first embodiment. The two-way valves 32 and 34 can have the same configuration as the two-way valves 32 and 34 described in the first embodiment. Although the arrangement | positioning location of the heat exchanger piping 171 in a housing | casing is not specifically limited, For example, it can arrange | position to the front side of the indoor heat exchanger 12.

  In the air conditioner 100 according to the fifth embodiment, the air-conditioning operation can be controlled in the same manner as in the first to fourth embodiments described above.

[Reference form]
In the first to fifth embodiments described above, as an example of the present invention, an air conditioner in which a radiant heat exchanger and a bypass path are arranged in parallel in a heat pump cycle has been described as an example. However, the operation control of the compressor 52 and the indoor blower 13 performed during the air-conditioning operation using the radiation heat exchanger 71 described above can be performed even in a configuration having no bypass path.

  Therefore, in the following, as a reference embodiment of the present invention, a configuration in which a bypass path and a bypass valve are not provided will be described with reference to FIGS. FIG. 11 shows the overall configuration of the air conditioner 200 according to the reference embodiment. FIG. 12 shows an internal configuration of the air conditioner 200 according to the reference embodiment.

<Overall configuration of air conditioner>
In FIG. 11, the flow of the refrigerant (heat medium) during the heating operation of the air conditioner 200 is indicated by a solid arrow, and the flow of the refrigerant (heat medium) during the cooling operation of the air conditioner 1 is indicated by a broken arrow. Yes.

  As shown in FIG. 11, the air conditioner 200 according to the present embodiment is a separate type air conditioner, and mainly includes an indoor unit 10, an outdoor unit 50, and a radiant heat exchange unit 270. ing. The air conditioner 200 is configured by connecting the indoor unit 10, the outdoor unit 50, and the radiant heat exchange unit 270 via the refrigerant pipe 57 and the refrigerant pipes 58a and 58b.

  In the air conditioner 200 according to the reference mode, the configurations similar to the indoor unit 10 and the outdoor unit 50 according to the first embodiment can be applied to the configurations of the indoor unit 10 and the outdoor unit 50.

  In the present embodiment, the radiant heat exchanger 271 is provided as a separate unit from the indoor unit 10 as in the first embodiment. The radiant heat exchange unit 270 is disposed indoors. The radiant heat exchange unit 270 mainly includes a radiant heat exchanger 271, a housing 272, and two two-way valves 32 and 34. As another configuration, similarly to the fifth embodiment, the radiant heat exchanger 271 can be arranged in a housing constituting the indoor unit 10.

  The radiant heat exchanger 271 is provided between the indoor heat exchanger 12 and the compressor 52 in the heat pump cycle. The radiant heat exchanger 271 is disposed in the housing 272. The radiant heat exchanger 271 includes a heat transfer pipe (refrigerant pipe) through which a refrigerant passes, a radiant panel, and the like. The two-way valves 32 and 34 can have the same configuration as the two-way valves 32 and 34 described in the first embodiment.

  As shown in FIG. 12, the indoor unit 10 includes an indoor fan 13, an indoor heat exchanger temperature sensor 14, an indoor temperature sensor 15, a display unit 16, a receiving unit 17, a louver 19, and a control unit 20. Is provided. The air conditioner 200 is provided with a remote controller (operation unit) 18 as a component different from the indoor unit 10. Further, as described above, the outdoor unit 50 is provided with the compressor 52, the outdoor blower 56, the outside air temperature sensor 62, the compressor temperature sensor 61, and the like. About these structures, the structure similar to each structural member demonstrated in 1st Embodiment is applicable.

  As described above, the air conditioner 200 according to the reference embodiment is different from the first embodiment in that the bypass path for bypassing the radiation heat exchanger 271 is not provided in the radiation heat exchange unit 270. Is different. Further, the radiant heat exchange unit 270 is not provided with a bypass valve controlled by the control unit 20. Therefore, when the air conditioner 200 is operated and the refrigeration cycle starts operation, the refrigerant unconditionally passes through the heat transfer pipe of the radiant heat exchanger 271.

  Here, an example of the control of the compressor 52 performed by the air conditioner 200 will be described with reference to FIG.

  First, the user operates the remote controller or the like to give an instruction to start the heating operation or the cooling operation to the air conditioner 200. At this time, the user inputs a desired temperature (set temperature) during the heating operation or the cooling operation from the operation unit 18. At this time, the target temperature assigned to the selected operation mode can be set as the set temperature by the user selecting one of the various operation modes.

  The receiving unit 17 of the air conditioner 200 receives this instruction and transmits a signal instructing the control unit 20 to start operation. When the control unit 20 receives this signal, it sends a command for starting the operation to each unit (for example, the compressor 52, each blower 13, 56, etc.) in the air conditioner 200.

  When the compressor 52 starts rotating, the refrigerant circulates in the refrigeration cycle. In the air conditioner 200, the refrigerant passes through the heat transfer pipe of the radiant heat exchanger 271 from the start of operation. That is, the operation using both the indoor heat exchanger 12 and the radiant heat exchanger 271 is performed (step S51).

  Next, the control unit 20 determines that the difference between the set temperature and the room temperature is smaller than a predetermined temperature X′2 (where X′2 can be within a range of 1 ° C. to 3 ° C., for example). It is confirmed whether or not (step S52).

  When the difference between the set temperature and the room temperature is equal to or higher than the predetermined temperature X′2 (NO in step S52), the initial setting state is maintained, and the compressor control unit 22 in the control unit 20 Based on the above, the rotational speed of the compressor 52 is controlled (step S53).

  On the other hand, when the difference between the set temperature and the room temperature becomes smaller than the predetermined temperature X′2 (YES in step S52), the compressor control unit 22 in the control unit 20 is based on the refrigerant temperature of the indoor heat exchanger 12. Then, the rotational speed of the compressor 52 is controlled (step S54). The refrigerant temperature of the indoor heat exchanger 12 can be measured by, for example, the indoor heat exchanger temperature sensor 14.

  After the processing of step S53 and step S54 is completed, the process returns to step S52 again, and monitoring is performed as to whether or not the difference between the set temperature and room temperature is smaller than a predetermined temperature X'2.

  In this way, the above control is continuously performed during the air conditioning operation. By performing such control, operation control according to the temperature change of the refrigerant in the indoor heat exchanger 12 can be performed. Thereby, the temperature fall at the time of heating operation or the temperature rise at the time of heating operation can be suppressed.

  Next, an example of control of the indoor blower 13 performed by the air conditioner 200 will be described with reference to FIG.

  When the receiving unit 17 of the air conditioner 200 receives an instruction for starting the heating operation or the cooling operation from the operation unit 18, the receiving unit 17 transmits a signal instructing the control unit 20 to start the operation. When the control unit 20 receives this signal, it sends a command for starting the operation to each unit (for example, the compressor 52, each blower 13, 56, etc.) in the air conditioner 200.

  When the compressor 52 starts rotating, the refrigerant circulates in the refrigeration cycle. In the air conditioner 200, the refrigerant passes through the heat transfer pipe of the radiant heat exchanger 271 from the start of operation. That is, the operation using both the indoor heat exchanger 12 and the radiant heat exchanger 271 is performed (step S61).

  Next, the controller 20 determines that the difference between the set temperature and the room temperature is a third predetermined temperature X′3 (where X3 ′ can be within a range of 1 ° C. to 3 ° C., for example). It is confirmed whether or not it has become smaller (step S62).

  When the difference between the set temperature and the room temperature is equal to or higher than the predetermined temperature X′3 (NO in step S62), the indoor fan control unit 23 in the control unit 20 continues the operation of the indoor fan 13 (step S64). Note that, in the operation of the indoor blower 13 here, control may be performed so as to reduce the rotational speed, similarly to step S5 (see FIG. 3) of the first embodiment described above.

  On the other hand, when the difference between the set temperature and the room temperature becomes smaller than the predetermined temperature X′3 (YES in step S62), the indoor fan control unit 23 stops the operation of the indoor fan 13 (step S63).

  After performing the control as described above, the indoor fan control unit 23 may end the control of the indoor fan 13. Or it returns to step S62 again and the control part 20 continues monitoring whether the difference of temperature and room temperature is smaller than predetermined temperature X'3, and the indoor air blower control part 23 is based on the monitoring result. Operation control of the indoor blower 13 may be performed.

  By performing such control, the operation state of the indoor blower 13 can be changed according to the difference between the set temperature and the room temperature. Thereby, more comfortable air conditioning operation can be performed.

(Summary)
In the air conditioner according to the present invention, the valve may be closed when the difference between the room temperature and the set temperature becomes smaller than a predetermined value (first predetermined value). By closing the valve, the heat medium flows mainly through the second indoor heat exchanger. Thereby, the air-conditioning driving | operation which used the indoor side heat exchanger and the 2nd indoor side heat exchanger together can be performed.

  In the air conditioner according to the present invention, as the operation stop time of the air conditioner before the start of operation is longer, the time for mainly flowing the heat medium through the bypass path may be increased. By doing in this way, according to the high necessity, the time which mainly flows the said heat medium to the said bypass path | route can be determined.

  In the air conditioner according to the present invention, the outside air temperature during the operation stop of the air conditioner before the start of operation or the heat medium in the compressor during the operation stop of the air conditioner before the operation start. Based on temperature, you may determine the time which mainly flows the said heat medium to the said bypass path. By doing in this way, according to the high necessity, the time which mainly flows the said heat medium to the said bypass path | route can be determined.

  When the difference between the room temperature and the set temperature becomes smaller than the second predetermined value, the air conditioner according to the present invention described above is configured so that the compressor is based on the temperature of the heat medium in the indoor heat exchanger. The rotational speed may be controlled. Such control is preferably performed when the heat medium is mainly flowing through the second indoor heat exchanger. Thereby, more comfortable air conditioning operation can be performed.

  In the above air conditioner according to the present invention, when the valve is closed, the rotational speed of the blower provided in the indoor heat exchanger is reduced or the operation of the blower is stopped. Good. Thereby, more comfortable air conditioning operation can be performed.

  In the air conditioner according to the present invention, when the difference between the room temperature and the set temperature becomes smaller than the third predetermined value, the operation of the blower provided in the indoor heat exchanger is stopped. Also good. Thereby, more comfortable air conditioning operation can be performed.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims. Further, configurations obtained by combining the configurations of the different embodiments described in this specification with each other are also included in the scope of the present invention.

1: Air conditioner 10: Indoor unit 12: Indoor heat exchanger (indoor heat exchanger)
13: Indoor blower (blower)
14: Indoor heat exchanger temperature sensor 15: Indoor temperature sensor 20: Control unit 21: Bypass valve control unit 22: Compressor control unit 23: Indoor blower control unit 33: Bypass valve (valve)
50: Outdoor unit 52: Compressor 54: Outdoor heat exchanger (outdoor heat exchanger)
55: Expansion valve 59: Bypass path 61: Compressor temperature sensor 62: Outside air temperature sensor 70: Radiation heat exchange unit 71: Radiation heat exchanger (second indoor heat exchanger)
100: Air conditioner 133: Bypass valve (valve)
159: Bypass path 170: Radiation heat exchanger 171: Heat transfer pipe X1 for radiation heat exchanger: First predetermined temperature (predetermined value)
X2: second predetermined temperature (second predetermined value)
X3: third predetermined temperature (third predetermined value)

Claims (7)

A compressor that compresses the heat medium, functions as a condenser during heating operation, an indoor heat exchanger that functions as an evaporator during cooling operation, an expansion valve that decompresses the heat medium, and functions as an evaporator during heating operation And an air conditioner including a heat pump cycle including an outdoor heat exchanger that functions as a condenser during cooling operation,
The heat pump cycle is
A second indoor heat exchanger disposed between the compressor and the indoor heat exchanger;
A bypass path disposed between the compressor and the indoor heat exchanger, wherein the heat medium flows around the second indoor heat exchanger;
A valve disposed in the bypass path,
At the start of operation, the valve is opened, and the heat medium flows mainly through the bypass path.   The air conditioner according to claim 1, wherein the valve is closed when a difference between a room temperature and a set temperature becomes smaller than a predetermined value.   The air conditioner according to claim 1, wherein the longer the operation stop time of the air conditioner before the start of operation, the longer the time for mainly flowing the heat medium through the bypass path.   Based on the outside air temperature during the operation stop of the air conditioner before the start of operation or the temperature of the heat medium in the compressor during the operation stop of the air conditioner before the operation start, The air conditioner according to claim 1, wherein a time for flowing the heat medium is determined. When the difference between the room temperature and the set temperature is smaller than the second predetermined value,
The air conditioner according to any one of claims 1 to 4, wherein the rotation speed of the compressor is controlled based on a temperature of the heat medium in the indoor heat exchanger. When the valve is closed,
The air conditioner according to any one of claims 1 to 5, wherein a rotational speed of a blower provided in the indoor heat exchanger is reduced, or operation of the blower is stopped. The operation of the blower provided in the indoor heat exchanger is stopped when the difference between the room temperature and the set temperature is smaller than a third predetermined value. Air conditioner.

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