JP2022050948A - Air conditioning ventilation system - Google Patents

Abstract

To suppress an impact of supply air on measurement of a temperature of indoor air by using a room temperature sensor installed in an indoor unit in an air conditioning ventilation system.SOLUTION: An air supply port 103 of an indoor unit 100 is communicated with an upstream side inner space US to send supply air SA sent from a ventilation device 300 to the upstream side inner space US on an air flow upstream side of an indoor heat exchanger 151. The indoor unit 100 includes a room temperature sensor 155 measuring a temperature of indoor air RA sucked from an indoor space SI. The room temperature sensor 155 is disposed in the upstream side inner space US while avoiding a place along which a main flow of the supply air SA sent out from the air supply port 103 flows.SELECTED DRAWING: Figure 1

Description

Regarding air conditioning and ventilation system.

Conventionally, as described in, for example, Patent Document 1 (Japanese Unexamined Patent Publication No. 2005-3344), there is an air-conditioning ventilation system in which a ventilation device having a total heat exchanger and an indoor unit are connected in series via a duct. ..

In the ventilation system of an air-conditioning ventilation system, the total heat exchanger exchanges heat of the outside air to generate supply air that is closer to the room temperature than the temperature of the outside air. The temperature of this supply air is different from the temperature of the indoor air. In the air conditioning ventilation system described in Patent Document 1, the supply air supplied from the ventilation device to the indoor unit is supplied to the upstream side of the indoor heat exchanger of the indoor unit. Therefore, when the temperature of the indoor air sucked into the indoor unit is measured by the room temperature sensor in the indoor unit, if the measurement is performed while supplying air, the measurement result may be affected by the temperature of the supply air.

The air-conditioning ventilation system has a problem of suppressing the influence of supply air on the measurement of the temperature of the indoor air by the room temperature sensor installed in the indoor unit.

The air-conditioning ventilation system of the first aspect has a total heat exchanger, a ventilation device that sends the outside air that has passed through the total heat exchanger as supply air, and is connected to the ventilation device, and has an indoor heat exchanger and an air supply port. It is also equipped with an indoor unit that air-conditions the indoor space. The air supply port communicates with the upstream internal space on the upstream side of the air flow of the indoor heat exchanger. The indoor unit has a room temperature sensor that measures the temperature of the indoor air sucked from the indoor space. The air supply sent from the ventilation device flows into the upstream internal space through the air supply port. The room temperature sensor is arranged in the upstream internal space avoiding the place where the main flow of the air supply coming out of the air supply port is along.

In the system of the first aspect, since the room temperature sensor is arranged so as to avoid the place where the mainstream of the air supply is along, it becomes difficult for the air supply to flow around the room temperature sensor even if the air supply is supplied. As a result, the influence of the supply air on the measurement of the temperature of the indoor air by the room temperature sensor can be suppressed.

The air-conditioning ventilation system of the second aspect is the system of the first aspect, and the inner side surface surrounding the upstream side internal space of the indoor unit is quadrangular in the top view. The indoor unit is provided in the central part of the internal space on the upstream side when viewed from above, and has an indoor fan that generates an air flow in the indoor heat exchanger. The air supply port is provided on the first side of the inner surface in the top view. The room temperature sensor is arranged along the first side of the inner surface in the top view.

In the system of the second viewpoint, the indoor fan is provided in the central part of the upstream internal space, and the temperature sensor is arranged along the same side as the first side where the air supply port is provided, so that the air supply is the indoor fan. Attracted by the flow of air. Therefore, it is difficult for the air supply to reach the room temperature sensor.

The air-conditioning ventilation system of the third aspect is the system of the second aspect, and the air supply port is provided at the end of the first side of the inner surface in the top view.

The air-conditioning ventilation system of the fourth aspect is the system of the third aspect, and the air supply port is the first air supply port and the second air supply port provided at both ends of the first side of the inner surface in the top view. including. The room temperature sensor is arranged between the first air supply port and the second air supply port in the top view. In the system of the fourth viewpoint, the air supply flowing from the two air supply ports is the air flow of the indoor fan. It is difficult for the air supply to reach the room temperature sensor located between the two air supply ports.

The air-conditioning ventilation system according to the fifth aspect is any of the systems from the second aspect to the fourth aspect, and the indoor unit has a bell mouth in the central portion of the upstream internal space in the top view. The room temperature sensor is fixed to the bell mouth in top view.

The air-conditioning ventilation system according to the sixth aspect is any of the systems from the first aspect to the fifth aspect, and the indoor unit includes a decorative panel facing the indoor space and an indoor unit in which an indoor heat exchanger is arranged. It is equipped with a suction chamber with an air supply port located between the decorative panel and the indoor unit. The room temperature sensor is located closer to the decorative panel than the air supply port.

In the system of the sixth aspect, the room temperature sensor is arranged at a position closer to the decorative panel than the air supply port and at a position far from the indoor heat exchanger. Therefore, the measurement result of the room temperature sensor is less likely to be affected by the air supply from the air supply port to the indoor unit.

The air-conditioning ventilation system according to the seventh aspect is any of the systems from the first aspect to the sixth aspect, and includes a remote controller for instructing the operation of the ventilation device and the indoor unit. The ventilator has an air supply fan for sending air supply. The indoor unit has an indoor fan that generates an air flow in the indoor heat exchanger. When the air supply fan is driven by an instruction from the remote controller, the indoor fan is configured to be driven in conjunction with it.

In the system of the seventh aspect, only the air supply fan is driven when the indoor fan is not driven, and it is possible to prevent the backflow of air in the indoor unit.

The air-conditioning ventilation system according to the eighth aspect is any of the systems from the first aspect to the seventh aspect, and the ventilation volume of the ventilation device is 30% or less of the rated air volume of the indoor unit.

In the system of the eighth aspect, it is possible to suppress that the air conditioning load becomes too large due to the excessive amount of air supply and the comfort is lowered.

It is a schematic diagram which shows the outline of an air conditioning ventilation system. It is a perspective view which shows the appearance of an indoor unit. It is a top view of the indoor unit with the top plate removed. It is sectional drawing of the indoor unit cut along the line I-I of FIG. It is an exploded perspective view which shows a part of an indoor unit and a duct. It is a side view which shows a part of an indoor unit and a duct. It is an exploded perspective view which shows an indoor unit and a suction chamber. It is a top view which shows a part of a suction chamber and a duct. It is a schematic diagram for demonstrating the flow of air supply in an indoor unit. It is a top view which shows the ventilation system and the suction chamber. It is a schematic diagram which shows the outline of the structure of the ventilation unit. It is a schematic diagram which shows the cross section of the ventilation unit cut along the line II-II of FIG. It is a schematic diagram which shows the cross section of the ventilation unit cut along the line III-III of FIG.

(1) Outline of Configuration of Air-Conditioning Ventilation System As shown in FIG. 1, the air-conditioning ventilation system 1 according to the embodiment includes an indoor unit 100, an outdoor unit 200, and a ventilation device 300. The indoor unit 100 and the outdoor unit 200 constitute an air conditioner 10. The air-conditioning device 10 is a device that performs air-conditioning in a room such as a building by performing a vapor compression refrigeration cycle.

The air conditioner 10 includes the outdoor unit 200, the indoor unit 100, the refrigerant connecting pipes 11 and 12 which are the refrigerant paths connecting the outdoor unit 200 and the indoor unit 100, and the constituent devices of the outdoor unit 200 and the indoor unit 100. It has a control unit 20 for controlling. The vapor compression type refrigerant circuit 15 of the air conditioner 10 is configured by connecting the outdoor unit 200 and the indoor unit 100 via the refrigerant connecting pipes 11 and 12. The refrigerant circuit 15 is filled with, for example, R32 refrigerant as the working refrigerant.

The ventilator 300 has a total heat exchanger 360. The outside air OA of the outdoor SO is driven by the air supply fan 330, passes through the total heat exchanger 360, and is sent to the indoor unit 100 as fresh air supply SA. The indoor air RA of the indoor space SI is driven by the exhaust fan 340, passes through the total heat exchanger 360, becomes an exhaust EA, and is discharged to the outdoor SO.

The indoor unit 100 is connected to the ventilation device 300. The indoor unit 100 has an indoor heat exchanger 151, a suction port 101, an outlet 102, and an air supply port 103. The indoor unit 100 sucks the indoor air RA from the indoor space SI through the suction port 101, and heat exchanges the indoor air RA with the indoor heat exchanger 151. The indoor unit 100 generates conditioned air CA by exchanging heat of the indoor air RA with the indoor heat exchanger 151. The indoor unit 100 blows the harmonized air CA into the indoor space SI through the air outlet 102 to air-condition the indoor space SI.

The indoor unit 100 has an upstream side internal space US on the upstream side of the air flow of the indoor heat exchanger 151. The air supply port 103 communicates with the upstream internal space US of the indoor unit 100. The air supply port 103 is an opening for sending the air supply SA sent from the ventilation device 300 to the upstream internal space US.

The indoor unit 100 has a room temperature sensor 155 that measures the temperature of the indoor air RA sucked from the indoor space SI. The room temperature sensor 155 is arranged in the upstream internal space US so as to avoid a place along which the mainstream of the air supply SA emitted from the air supply port 103 is located. The indoor unit 100 is controlled by the control unit 20 so that the temperature of the air measured by the room temperature sensor 155 becomes the set temperature.

(2) Detailed configuration of the air conditioning ventilation system (2-1) Configuration of the air conditioner (2-1-1) Configuration of the outdoor unit The outdoor unit 200 is installed in the outdoor SO and is a part of the refrigerant circuit 15. Consists of. The outdoor unit 200 has an accumulator 207, a compressor 208, a four-way valve 210, an outdoor heat exchanger 211, an outdoor expansion valve 212 as an expansion mechanism, and an outdoor fan 215. Each device of the outdoor unit 200 and the valve are connected by a refrigerant pipe. The accumulator 207 is a container for supplying the gas refrigerant to the compressor 208, and is connected to the suction port of the compressor 208. The compressor 208 sucks in the low-pressure gas refrigerant, compresses it, and discharges the high-pressure gas refrigerant.

The outdoor heat exchanger 211 is a heat exchanger that functions as a radiator of the refrigerant discharged from the compressor 208 during the cooling operation and as an evaporator of the refrigerant sent from the indoor heat exchanger 151 during the heating operation. .. The liquid side of the outdoor heat exchanger 211 is connected to the outdoor expansion valve 212, and the gas side is connected to the four-way valve 210.

The outdoor expansion valve 212 decompresses the refrigerant dissipated in the outdoor heat exchanger 211 before sending it to the indoor heat exchanger 151 during cooling operation, and decompresses the refrigerant dissipated in the indoor heat exchanger 151 during heating operation in the outdoor heat exchanger 151. It is an expansion valve for reducing the pressure before sending to 211. For the outdoor expansion valve 212, for example, an electric expansion valve is used.

The four-way valve 210 switches between the state shown by the solid line of the four-way valve 210 in FIG. 1 and the state shown by the broken line of the four-way valve 210 in FIG. Switch between the connection status. In the state shown by the solid line of the four-way valve 210, the discharge port of the compressor 208 is connected to the outdoor heat exchanger 211, and the suction port of the compressor 208 is connected to the indoor heat exchanger 151 via the refrigerant connecting pipe 12. It is in a state of being done. In the state shown by the broken line of the four-way valve 210, the discharge port of the compressor 208 is connected to the indoor heat exchanger 151 via the refrigerant connecting pipe 12, and the suction port of the compressor 208 is connected to the outdoor heat exchanger 211. It is in a state of being done.

The outdoor fan 215 is arranged inside the outdoor unit 200. The outdoor fan 215 sucks in the outside air OA, supplies the outside air OA to the outdoor heat exchanger 211, and then forms an air flow to be discharged to the outside of the outdoor unit 200. As described above, the outside air OA supplied by the outdoor fan 215 is used as a cooling source or a heating source in heat exchange with the refrigerant of the outdoor heat exchanger 211.

(2-1-2) Configuration of Indoor Unit FIG. 2 shows the appearance of the indoor unit 100. FIG. 3 shows a state in which the top plate of the indoor unit 100 is removed. FIG. 4 shows an outline of a cross section of the indoor unit 100 cut at the location of the line I-I in FIG. The indoor unit 100 is a type of indoor unit installed by being embedded in the opening of the ceiling U, and constitutes a part of the refrigerant circuit 15. FIG. 5 is an exploded perspective view of the indoor unit 100.

The indoor unit 100 has an indoor unit 130, a decorative panel 120, and a suction chamber 160. On the upstream side of the air flow of the indoor heat exchanger 151, there is an indoor unit 130, a decorative panel 120, and an upstream internal space US surrounded by a suction chamber 160. The inner side surface 105 of the indoor unit 100 surrounding the upstream side internal space US is a quadrangle when viewed from above (see FIG. 8).

The indoor unit 130 includes a casing 139, an indoor heat exchanger 151, an indoor fan 152, a bell mouth 136, a drain pan 140, and a wind direction changing member 135. The casing 139 is inserted and installed in the opening formed in the ceiling U of the interior space SI. Casing 139 is a box-shaped body having an open lower surface. The casing 139 exhibits a substantially octagonal shape in which long sides and short sides are alternately formed in a top view. The casing 139 includes a top plate and a plurality of side plates extending downward from the peripheral edge of the top plate.

The indoor heat exchanger 151 is arranged inside the casing 139 in a bent state so as to surround the periphery of the indoor fan 152 in the top view. In other words, the indoor heat exchanger 151 has four sides along the four first side outlets 121, the second side outlet 122, the third side outlet 123, and the fourth side outlet 124 in the top view. Is arranged to have. The indoor heat exchanger 151 has, for example, a large number of heat transfer fins arranged at predetermined intervals, and a plurality of heat transfer tubes penetrating these heat transfer fins in the plate thickness direction. One end of the refrigerant connecting pipe 11 is connected to the liquid side of the indoor heat exchanger 151, and one end of the refrigerant connecting pipe 12 is connected to the gas side of the indoor heat exchanger 151. The refrigerant connecting pipe 11 is connected to the inside of the casing 139 from a corner portion of the corner portion of the casing 139 that is different from the corner portion to which the downstream air supply duct 324, which will be described later, is connected.

The indoor fan 152 is a centrifugal blower arranged inside the casing 139. The indoor fan 152 sucks the indoor air RA into the indoor unit 100 and generates an air flow for blowing out the conditioned air CA from the indoor unit 100. By driving the indoor fan 152, the indoor unit 100 sucks the indoor air RA into the indoor unit 130 through the suction port 101 of the decorative panel 120. Further, by driving the indoor fan 152, the indoor unit 100 passes the indoor air RA through the indoor heat exchanger 151 to generate conditioned air CA. By driving the indoor fan 152, the indoor unit 100 blows out the indoor unit 130 through the side outlet 127 of the decorative panel 120. The indoor fan 152 has a 153 provided in the center of the top plate of the casing 139, and an impeller connected to the 153 and driven to rotate. The impeller is an impeller with turbo blades. By rotating the impeller with the rotation axis O as the axis, air can be sucked into the impeller from below and blown out toward the outer peripheral side of the impeller in the top view. The indoor fan 152 can control the air volume in a plurality of stages by controlling the rotation speed by the control unit 20.

The drain pan 140 is arranged below the indoor heat exchanger 151, and receives the drain water generated by the condensation of the moisture in the air in the indoor heat exchanger 151. The drain pan 140 is attached to the lower part of the casing 139. In the drain pan 140, a cylindrical space extending in the vertical direction is formed inside the indoor heat exchanger 151 when viewed from above. The bell mouth 136 is arranged below the inside of the cylindrical space of the drain pan 140. The bell mouth 136 is a member for guiding the air sucked from the suction port 101 to the indoor fan 152. The bell mouth 136 has a horizontally extending flat surface portion and a vertically extending cylindrical portion. The inside of this cylindrical portion becomes the opening 137.

The drain pan 140 has a first outlet flow path 141, a second outlet flow path 142, a third outlet flow path 143, and a fourth outlet flow path 144 extending in the vertical direction outside the indoor heat exchanger 151 in a top view. The first corner blowout flow path 145 and the second corner blowout flow path 146 are formed. The flow paths 147 and 148 are closed to form the first air supply port 167 and the second air supply port 168. The first outlet flow path 141 communicates with the first side outlet 121. The second outlet flow path 142 communicates with the second side outlet 122. The third outlet flow path 143 communicates with the third side outlet 123. The fourth outlet flow path 144 communicates with the fourth side outlet 124. The first corner outlet flow path 145 communicates with the first corner outlet 125. The second corner outlet flow path 146 communicates with the second corner outlet 126.

The decorative panel 120 is fitted into the opening of the ceiling U and installed. The decorative panel 120 extends outward from the top plate and side plates of the casing 139 in the top view. The decorative panel 120 is attached below the casing 139 from the side of the interior space SI. The decorative panel 120 has an inner frame 120a and an outer frame 120b. The outer frame 120b is provided on the outside of the inner frame 120a in a top view. Inside the inner frame 120a in the top view, a suction port 101 having a substantially square shape in the top view is formed, which is open downward. The suction port 101 of the decorative panel 120 is provided with a filter 129 for removing dust in the air sucked from the suction port 101.

The outer frame 120b in the top view is formed with an outlet 102 that opens diagonally downward from below. The outlet 102 includes four side outlets 127 and two corner outlets 128. When the four side outlets 127 are distinguished from each other, they are referred to as a first side outlet 121, a second side outlet 122, a third side outlet 123, and a fourth side outlet 124. When the two corner outlets 128 are distinguished from each other, they are referred to as a first corner outlet 125 and a second corner outlet 126.

The suction chamber 160 is arranged between the decorative panel 120 and the indoor unit 130. The suction chamber 160 is connected to the downstream side air supply duct 324 which is bifurcated via the connection chambers 171 and 172. FIG. 6 shows a state in which the indoor unit 100 installed on the ceiling is viewed from the side. FIG. 7 shows the indoor unit 130 and the suction chamber 160 in an enlarged manner. The suction chamber 160 has two air supply ports (first air supply port 167 and second air supply port 168). FIG. 8 shows a state in which the suction chamber 160 connected to the duct is viewed from below. As shown in FIGS. 7 and 8, the inner side surface 105 surrounding the upstream internal space US is a quadrangle in top view. The inner side surface 105 of the quadrangle has a first side 111, a second side 112, a third side 113, and a fourth side 114. In other words, the quadrangle has four angles Co1, Co2, Co3, Co4. The first side 111 is the side to which the connection chambers 171 and 172 are connected. Seen from below, the second side 112 is in the counterclockwise direction from the first side 111, and the third side 113 is in the clockwise direction from the first side 111. The fourth side 114 is on the side facing the first side 111. In this embodiment, the fourth side 114 is a side parallel to the first side 111.

In FIG. 9, the flow of the supply air SA blown out to the upstream internal space US is shown simplified by arrows AR1 and AR2. As can be seen from FIG. 9, in top view (bottom view), the air is blown from the first air supply port 167 toward the fourth side 114 along the second side 112, and the second air supply port 168 to the third. It is blown toward the fourth side 114 along the side 113. Therefore, the supply air SA flowing along the first side 111 is less than the supply air SA flowing along the second side 112, the third side 113, and the fourth side 114 other than the first side 111 of the inner side surface 105 in the top view. Become.

The suction chamber 160 has a first outlet flow path 161 and a second outlet flow path 162, a third outlet flow path 163, and a fourth outlet flow path 164 extending in the vertical direction on the outside of the indoor heat exchanger 151 when viewed from above. And the first corner blowout channel 165 and the second corner blowout channel 166 are formed. The first outlet flow path 161 communicates with the first side outlet 121. The second outlet flow path 162 communicates with the second side outlet 122. The third outlet flow path 163 communicates with the third side outlet 123. The fourth outlet flow path 164 communicates with the fourth side outlet 124. The first corner outlet flow path 165 communicates with the first corner outlet 125. The second corner outlet flow path 166 communicates with the second corner outlet 126. The first outlet channel 161 and the second outlet channel 162, the third outlet channel 163, and the fourth outlet channel 164 are the first side 111, the second side 112, and the first side 112 of the square suction port 101 in the top view. It is provided so as to extend in parallel with the three sides 113 and the fourth side 114.

The first air supply port 167 is provided at the end of the first side 111. The second air supply port 168 is provided at an end portion of the first side 111 opposite to the end portion where the first air supply port 167 is provided. The first air supply port 167 and the second air supply port 168 are arranged in the vicinity of the two corners Co1 and Co2 on both sides of the first side 111 of the inner side surface 105 in the top view.

The wind direction changing member 135 is a member capable of changing the direction of the air flow passing through the air outlet 102. The wind direction changing member 135 includes a first wind direction changing member 131 arranged at the first side air outlet 121, a second wind direction changing member 132 arranged at the second side air outlet 122, and a third side air outlet. The third wind direction changing member 133 arranged at 123 and the fourth wind direction changing member 134 arranged at the fourth side outlet 124 are included. The posture of the wind direction changing member 135 is controlled to be a plurality of predetermined angles according to the degree of rotation of the drive shaft. As the posture of such a wind direction changing member 135, a closed posture, a horizontal blowing posture, and an inverted posture are predetermined. As shown in FIG. 4, the horizontal blowing posture is a posture for reducing the draft feeling due to the air flow blown from the side outlet 127 being directly supplied to the user existing below. The inverted posture is a posture in which the air flow passing through the outlet 102 is guided from below to the suction port 101 side. The posture of the wind direction changing member 135 is controlled by driving the drive shaft by the control unit 20 when, for example, the wind direction instruction from the user is received via the remote controller 30. The first wind direction changing member 131, the second wind direction changing member 132, the third wind direction changing member 133, and the fourth wind direction changing member 134 may be independently controlled by the control unit 20, or may be controlled at the same time.

The indoor unit 100 has a room temperature sensor 155 that measures the temperature of the indoor air RA sucked from the indoor space SI. The room temperature sensor 155 detects the temperature of the indoor air before passing through the indoor heat exchanger 151. The room temperature sensor 155 is arranged in the upstream internal space US so as to avoid a place along which the mainstream of the air supply SA emitted from the first air supply port 167 and the second air supply port 168 is along. The room temperature sensor 155 is arranged along the first side 111 of the inner side surface 105 in the top view. The room temperature sensor 155 is arranged between the first air supply port 167 and the second air supply port 168 in the top view. The room temperature sensor 155 is arranged between the first air supply port 167 and the second air supply port 168 and the indoor heat exchanger 151 in the side view. The room temperature sensor 155 is fixed to the bell mouth 136. The room temperature sensor 155 is arranged between the opening 137 of the bell mouth 136 and the first side 111 in the top view.

The control unit 20 includes a ventilation control unit, an outdoor control unit, an indoor control unit, and a remote controller 30, and is configured by connecting these units so as to be communicable. The ventilation control unit is an electrical component unit having a control board provided in the ventilation device 300. The outdoor control unit is an electrical component unit having a control board provided on the outdoor unit 200. The indoor control unit is an electrical component unit having a control board provided on the indoor unit 100. The remote controller 30 receives various setting operations from the user. The outdoor control unit is connected to each sensor (not shown) and grasps the detection value in these sensors. The indoor control unit is connected to the room temperature sensor 155 and other sensors (not shown), and grasps the detected values in these sensors.

The electrical component section of the indoor control section of the control section 20 is housed in the electrical component box 190. The electrical component box 190 is arranged in the upstream internal space US along the second side 112. The room temperature sensor 155 is connected to the electrical component box 190. The room temperature sensor 155 is arranged along the first side 111 at a position closer to the electrical component box 190 than the center of the first side 111. As a result, the wiring connecting the room temperature sensor 155 and the electrical component box 190 can be shortened.

The control unit 20 controls the components of the air conditioner 10 (outdoor unit 200 and indoor unit 100) and the ventilation device 300 according to the detection value of each sensor and the instruction from the remote controller 30. The ventilation control unit, the outdoor control unit, the indoor control unit, and the remote controller 30 each include, for example, one or a plurality of CPUs, ROMs, RAMs, and the like. The control unit 20 performs various controls by, for example, executing a control program stored in the ROM in response to information obtained from each sensor or an instruction from the remote controller 30.

(2-1-3) Operation of the air conditioner Next, the operation of the air conditioner 10 will be described with reference to FIG. 1. In the air conditioner 10, the cooling operation and dehumidifying operation in which the refrigerant flows in the order of the compressor 208, the outdoor heat exchanger 211, the outdoor expansion valve 212, and the indoor heat exchanger 151, and the compressor 208, the indoor heat exchanger 151, and the outdoor expansion A heating operation is performed in which the refrigerant flows in the order of the valve 212 and the outdoor heat exchanger 211. The cooling operation, dehumidifying operation, and heating operation are controlled by the control unit 20.

(2-1-3-1) Cooling operation and dehumidifying operation During the cooling operation and dehumidifying operation, the connection state of the four-way valve 210 is switched so that the outdoor heat exchanger 211 acts as a radiator for the refrigerant (solid line in FIG. 1). reference). In the refrigerant circuit 15, the low-pressure gas refrigerant in the refrigeration cycle is sucked into the compressor 208, compressed to a high pressure in the refrigeration cycle, and then discharged. The high-pressure gas refrigerant discharged from the compressor 208 is sent to the outdoor heat exchanger 211 through the four-way valve 210. The high-pressure gas refrigerant sent to the outdoor heat exchanger 211 exchanges heat with the outside air OA supplied by the outdoor fan 215 in the outdoor heat exchanger 211 to dissipate heat and becomes a high-pressure liquid refrigerant. When the high-pressure liquid refrigerant passes through the outdoor expansion valve 212, it is depressurized until it reaches a low pressure in the refrigeration cycle, becomes a gas-liquid two-phase state refrigerant, and is sent to the indoor unit 100 through the refrigerant connecting pipe 11.

The low-pressure gas-liquid two-phase state refrigerant evaporates by exchanging heat with the indoor air RA supplied by the indoor fan 152 during the cooling operation in the indoor heat exchanger 151. The air passing through the indoor heat exchanger 151 is cooled to become conditioned air CA, and the conditioned air CA cools the interior space SI. Although the drive of the indoor fan 152 is suppressed during the dehumidifying operation as compared with the cooling operation, the refrigerant passing through the indoor heat exchanger 151 exchanges heat with the indoor air RA and evaporates. As a result, the moisture in the air is condensed on the surface of the indoor heat exchanger 151 and recovered, and the indoor heat is dehumidified. The low-pressure gas refrigerant evaporated in the indoor heat exchanger 151 is sent to the outdoor unit 200 through the refrigerant connecting pipe 12. The low-pressure gas refrigerant sent to the outdoor unit 200 is sucked into the compressor 208 again through the four-way valve 210 and the accumulator 207. In the cooling operation and the dehumidifying operation, the refrigerant circulates in the refrigerant circuit 15 as described above.

(2-1-3-2) Heating operation During the heating operation, the connection state of the four-way valve 210 is switched so that the outdoor heat exchanger 211 serves as an evaporator of the refrigerant (see the broken line in FIG. 1). In the refrigerant circuit 15, the low-pressure gas refrigerant in the refrigeration cycle is sucked into the compressor 208, compressed to a high pressure in the refrigeration cycle, and then discharged. The high-pressure gas refrigerant discharged from the compressor 208 is sent to the indoor unit 100 through the four-way valve 210 and the refrigerant connecting pipe 12.

The high-pressure gas refrigerant exchanges heat with the indoor air RA supplied by the indoor fan 152 in the indoor heat exchanger 151 to dissipate heat and becomes a high-pressure liquid refrigerant. The air passing through the indoor heat exchanger 151 is heated to become conditioned air CA, and the conditioned air CA heats the indoor space SI. The high-pressure liquid refrigerant radiated by the indoor heat exchanger 151 is sent to the outdoor unit 200 through the refrigerant connecting pipe 11.

The high-pressure liquid refrigerant sent to the outdoor unit 200 is depressurized to the low pressure of the refrigeration cycle at the outdoor expansion valve 212, and becomes a low-pressure gas-liquid two-phase state refrigerant. The low-pressure gas-liquid two-phase refrigerant decompressed by the outdoor expansion valve 212 undergoes heat exchange with the outside air OA supplied by the outdoor fan 215 in the outdoor heat exchanger 211 and evaporates to become a low-pressure gas refrigerant. Become. This low-pressure gas refrigerant is sucked into the compressor 208 again through the four-way valve 210 and the accumulator 207. In the heating operation, the refrigerant circulates in the refrigerant circuit 15 as described above.

(2-2) Configuration of Ventilation Device (2-2-1) Outline of Configuration of Ventilation Device FIG. 10 shows a state in which the ventilation device 300 is connected to the suction chamber 160 of the indoor unit 100. FIG. 11 is a schematic configuration diagram of the ventilation unit 305 in a ventilation operation state when viewed from above. FIG. 12 schematically shows a cross section of the ventilation unit 305 cut along the line II-II of FIG. FIG. 13 schematically shows a cross section of the ventilation unit 305 cut along line III-III of FIG. The ventilation device 300 is arranged behind the ceiling of the interior space SI, and is a device that exchanges heat between the supply air SA and the exhaust EA while ventilating the interior space SI.

The ventilation device 300 includes a ventilation unit 305, an upstream side exhaust duct 321 and a downstream side exhaust duct 322, an upstream side air supply duct 323, a downstream side air supply duct 324, and a ventilation control unit. The ventilator 300 is connected to the remote controller 30. The user can instruct various setting operations for the ventilation device 300 by using the remote controller 30 arranged in the indoor space SI.

(2-2-2) Configuration of Ventilation Unit The ventilation unit 305 includes a casing 350, an air supply fan 330, an exhaust fan 340, a total heat exchanger 360, and a filter 370. The casing 350 contains a substantially quadrangular prism-shaped total heat exchanger 360, an air supply fan 330, and an exhaust fan 340. The casing 350 is connected to the upstream exhaust duct 321 and the downstream exhaust duct 322, the upstream air supply duct 323 and the downstream air supply duct 324.

In the casing 350, an upstream side exhaust space 311, a downstream side exhaust space 312, an upstream side air supply space 313, and a downstream side air supply space 314 are provided. The upstream exhaust space 311 is provided on the upstream exhaust duct 321 side with respect to the total heat exchanger 360. The downstream exhaust space 312 is provided on the downstream exhaust duct 322 side with respect to the total heat exchanger 360. The upstream air supply space 313 is provided on the upstream air supply duct 323 side with respect to the total heat exchanger 360. The downstream air supply space 314 is provided on the downstream air supply duct 324 side with respect to the total heat exchanger 360. The air supply fan 330 is arranged in the downstream air supply space 314, and has an air supply fan motor 331. The exhaust fan 340 is arranged in the downstream exhaust space 312, and has an exhaust fan motor 341.

As shown in FIGS. 1 and 12, the outside air OA of the outdoor SO is supplied to the interior space SI as fresh air supply SA by driving the supply air fan 330. When the supply air fan 330 is driven, the outside air OA reaches the total heat exchanger 360 via the upstream air supply flow path C, passes through the total heat exchanger 360, and becomes the supply air SA. As shown in FIGS. 1 and 13, the indoor air RA in the indoor space SI becomes an exhaust EA and is discharged to the outdoor SO by driving the exhaust fan 340. When the exhaust fan 340 is driven, the indoor air RA reaches the total heat exchanger 360 via the upstream exhaust flow path A, passes through the total heat exchanger 360, and becomes an exhaust EA. The total heat exchanger 360 causes heat exchange between the indoor air RA and the outside air OA while preventing the indoor air RA and the outside air OA from mixing with each other. In this way, the total heat exchanger 360 reduces the air conditioning load associated with ventilation by bringing the temperature of the outdoor SO closer to the temperature of the indoor air RA of the indoor space SI. The filter 370 is configured to surround and cover the entire inflow and outflow surfaces of the total heat exchanger 360, for example, as shown in FIG. For both the outside air OA and the indoor air RA, dust can be removed before being supplied to the total heat exchanger 360, and the dust collecting G can be prevented from flowing into the total heat exchanger 360. can.

The control unit 20 includes a ventilation control unit, and is connected to an air supply fan motor 331, an exhaust fan motor 341, and a remote controller 30. The control unit 20 controls the drive of the supply air fan motor 331 and the exhaust fan motor 341 by acquiring various temperature information by the room temperature sensor 155 and other sensors (not shown).

(2-2-3) Duct configuration The upstream exhaust duct 321 extends from the interior space SI to the upstream exhaust space 311 of the casing 350. The downstream exhaust duct 322 extends from the downstream exhaust space 312 of the casing 350 to the outdoor SO. The upstream air supply duct 323 extends from the outdoor SO to the upstream air supply space 313 of the casing 350. The downstream air supply duct 324 extends from the downstream air supply space 314 of the casing 350 to the indoor unit 100.

The upstream side exhaust duct 321 and the upstream side exhaust space 311 form an upstream side exhaust flow path A with respect to the total heat exchanger 360. The downstream exhaust duct 322 and the downstream exhaust space 312 form a downstream exhaust flow path B with respect to the total heat exchanger 360. The upstream air supply duct 323 and the upstream air supply space 313 form an upstream air supply flow path C with respect to the total heat exchanger 360. The downstream air supply duct 324 and the downstream air supply space 314 form a downstream air supply flow path D with respect to the total heat exchanger 360.

(2-2-4) Ventilation operation When the indoor temperature and the outdoor temperature satisfy a predetermined relational condition for starting the ventilation operation, the ventilation operation control unit 20 has an air supply fan as shown in FIG. Ventilation operation is performed by driving both 330 and the exhaust fan 340.

By performing the ventilation operation in this way, it is possible to supply fresh air supply SA to the interior space SI. Further, the air supply SA supplied to the indoor space SI can be brought close to the indoor temperature by exchanging heat with the indoor air RA in the total heat exchanger 360, and the air conditioning load of the indoor space SI can be reduced. can.

The control unit 20 controls the indoor fan 152 to be driven in conjunction with the air supply fan 330 when the air supply fan 330 is driven by an instruction from the remote controller 30. For example, the air supply fan motor 331 and the exhaust fan motor 341 are motors having a fixed rotation speed. In this case, the control unit 20 controls on / off of the air supply fan motor 331 and the exhaust fan motor 341. When the air supply fan motor 331 is being driven, the indoor fan 152 generates an air volume in the indoor unit 100 so that the air supply SA is not blown out from the suction port 101 of the indoor unit 100 to the interior space SI. When only the air supply fan 330 is driven when the indoor fan 152 is not driven, the air supply SA flows back from the suction port 101 to the indoor space SI in the indoor unit 100, and rides on the backflow air to the filter 129. Adhering dust may fall into the indoor space SI. If the indoor fan 152 is controlled to be driven in conjunction with the air supply fan 330, such a problem can be suppressed. For example, when the indoor fan 152 has a configuration in which the air volume can be increased stepwise by a plurality of fan taps, the control unit 20 is a fan in which the air supply SA blows out from the suction port 101 to the interior space SI when the air supply fan 330 is driven. Control not to select switching to tap. The ventilation volume of the ventilation device 300 is preferably set to 30% or less of the rated air volume of the indoor unit 100. When the air supply fan 330 is stopped and only the indoor fan 152 is driven, the control unit 20 controls the indoor fan 152 without limiting the control as described above.

(3) Modification example (3-1) Modification example A
In the above embodiment, the case where the room temperature sensor 155 is provided between the first air supply port 167 and the second air supply port 168 and the indoor heat exchanger 151 in the side view has been described. However, the room temperature sensor 155 may be arranged at a position closer to the decorative panel 120 than the first air supply port 167 and the second air supply port 168 in the side view. In the side view, the position closer to the decorative panel 120 than the first air supply port 167 and the second air supply port 168 is the position where the first air supply port 167 and the second air supply port 168 and the indoor heat exchanger 151 are located. The temperature change due to the influence of the air supply SA is smaller than the position between them.

(3-2) Modification B
In the above embodiment, the case where the two first air supply ports 167 and the second air supply port 168 are provided has been described. However, the number of air supply ports is not limited to two. For example, the indoor unit 100 may have only one air supply port.

(3-3) Modification C
In the above embodiment, the case where the room temperature sensor 155 is arranged along the first side 111 in the top view has been described, but the room temperature sensor 155 may be arranged along the fourth side 114 in the top view. good. By arranging the room temperature sensor 155 along the first side 111 rather than arranging it along the fourth side 114, the influence of the air supply SA can be reduced in the measurement of the room temperature. However, the influence of the air supply SA can be reduced by arranging the room temperature sensor 155 along the fourth side 114 rather than arranging the room temperature sensor 155 along the second side 112 and the third side 113.

(4) Features (4-1)
In the above-mentioned air-conditioning ventilation system 1, the room temperature sensor 155 is arranged so as to avoid a place along the mainstream of the supply air SA blown out from the air supply port 103. Therefore, even if the supply air SA is supplied, it becomes difficult for the supply air SA to flow around the room temperature sensor 155. As a result, the influence of the supply air SA on the measurement of the temperature of the indoor air RA by the room temperature sensor 155 can be suppressed.

(4-2)
In the above-mentioned air-conditioning ventilation system 1, an indoor fan 152 is provided in the central portion of the upstream internal space US, and the air supply port 103 or the first air supply port 167 and the second air supply port 168 are provided on the first side 111. The room temperature sensor 155 is arranged along the same side. The air supply SA is attracted to the air flow of the indoor fan 152. Therefore, it becomes difficult for the air supply SA to reach the room temperature sensor 155, and the result of measurement by the room temperature sensor 155 is less likely to be affected by the air supply SA.

(4-3)
In the above-mentioned air conditioning ventilation system 1, the air supply air flowing in from the two air supply ports 167 and 168 is attracted to the air flow of the indoor fan 152, so that the room temperature sensor is arranged between the two air supply ports 167 and 168. The air supply SA is less likely to reach 155, and the measurement result by the room temperature sensor 155 is less likely to be affected by the air supply SA.

(4-4)
In the air-conditioning ventilation system 1 of the above-mentioned modification A, the room temperature sensor 155 is arranged at a position closer to the decorative panel 120 than the first air supply port 167 and the second air supply port 168, and is located far from the indoor heat exchanger 151. Is placed in. When the room temperature sensor 155 is arranged in this way, the measurement result of the room temperature sensor 155 is less likely to be affected by the air supply SA directed from the first air supply port 167 and the second air supply port 168 to the indoor unit 130.

(4-5)
In the above-mentioned air conditioning / ventilation system 1, the indoor unit 100 is configured so that the indoor fan 152 is driven in conjunction with the air supply fan 330 when the air supply fan 330 is driven by an instruction from the remote controller 30. Therefore, when the indoor fan 152 is not driven, only the air supply fan 330 is driven, and it is possible to prevent backflow of air in the indoor unit 100. Alternatively, since the air volume of the air supply fan 330 is larger than the air volume of the indoor fan 152, it is possible to prevent backflow of air in the indoor unit 100.

(4-6)
In the above-mentioned air conditioning ventilation system 1, the ventilation volume of the ventilation device 300 is set to 30% or less of the rated air volume of the indoor unit 100. In the air-conditioning ventilation system 1 configured in this way, it is possible to prevent the air-conditioning load from becoming too large and the comfort from being lowered due to the excessive amount of air supply SA.

Although the embodiments of the present disclosure have been described above, it will be understood that various modifications of the embodiments and details are possible without departing from the spirit and scope of the present disclosure described in the claims. ..

1 Air conditioning ventilation system 30 Remote controller 100 Indoor unit 103 Air supply port 105 Inner side surface 111 1st side 112 2nd side 113 3rd side 114 4th side 120 Decorative panel 121 1st side air outlet 122 2nd side air outlet 123 3rd side air outlet 124 4th side air outlet 130 Indoor unit 136 Bellmouth 137 Opening 151 Indoor heat exchanger 152 Indoor fan 155 Room temperature sensor 160 Suction chamber 167 1st air supply port 168 2nd air supply port 300 Ventilator 330 Air supply fan 360 Total heat exchanger

Japanese Unexamined Patent Publication No. 2005-3344

Claims (8)

A ventilation device (300) having a total heat exchanger (360) and sending outside air that has passed through the total heat exchanger as supply air.
An indoor unit (100) that is connected to the ventilation device, has an indoor heat exchanger (151) and an air supply port (103), and air-conditions an indoor space.
Equipped with
The air supply port communicates with the upstream internal space on the upstream side of the air flow of the indoor heat exchanger.
The indoor unit has a room temperature sensor (155) that measures the temperature of the indoor air sucked from the indoor space.
The air supply sent from the ventilation device flows into the upstream internal space through the air supply port, and then flows into the upstream internal space.
The room temperature sensor is an air-conditioning ventilation system (1) arranged in the upstream internal space avoiding a place along which the main flow of the air supply coming out of the air supply port is along. The inner side surface (105) surrounding the upstream side internal space of the indoor unit is a quadrangle when viewed from above.
The indoor unit is provided in the central portion of the upstream side internal space in a top view, and has an indoor fan (152) that generates an air flow in the indoor heat exchanger.
The air supply port is provided on the first side of the inner side surface in a top view.
The room temperature sensor is arranged along the first side (111) of the inner surface in the top view.
The air-conditioning ventilation system (1) according to claim 1. The air supply port is provided at the end of the first side of the inner side surface in a top view.
The air-conditioning ventilation system (1) according to claim 2. The air supply port includes a first air supply port (167) and a second air supply port (168) provided at both ends of the first side of the inner surface surface in a top view.
The room temperature sensor is arranged between the first air supply port and the second air supply port in a top view.
The air-conditioning ventilation system (1) according to claim 3. The indoor unit has a bell mouth (136) in the central portion of the upstream internal space in a top view.
The room temperature sensor is fixed to the bell mouth.
The air-conditioning ventilation system (1) according to any one of claims 2 to 4. The indoor unit is arranged between the decorative panel (120) facing the indoor space, the indoor unit (130) in which the indoor heat exchanger is arranged, and the decorative panel and the indoor unit. Equipped with a suction chamber (160) with an air supply port,
The room temperature sensor is arranged at a position closer to the decorative panel than the air supply port.
The air-conditioning ventilation system (1) according to any one of claims 1 to 5. A remote controller (30) for instructing the operation of the ventilation device and the indoor unit is provided.
The ventilator has an air supply fan (330) for sending the air supply.
The indoor unit has an indoor fan (152) that generates an air flow in the indoor heat exchanger.
When the air supply fan is driven by an instruction from the remote controller, the indoor fan is configured to be driven in conjunction with the air supply fan.
The air-conditioning ventilation system (1) according to any one of claims 1 to 6. The ventilation volume of the ventilation device is 30% or less of the rated air volume of the indoor unit.
The air-conditioning ventilation system (1) according to any one of claims 1 to 7.

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