JP2015021720A - Heat exchange ventilation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchange ventilation device capable of drying water adhering to a bypass air passage during normal ventilation operation and performing heat exchange ventilation simultaneously.SOLUTION: A heat exchange ventilation device moves a bypass air passage changeover plate 12 from a normal ventilation operation position where the bypass air passage changeover plate 12 opens a bypass air passage 11 and closes an air supply passage 1a of a heat exchanger 1, to a simultaneous ventilation operation position where the bypass air passage changeover plate 12 opens both of the bypass air passage 11 and the air supply passage 1a, on the basis of a measurement value of a humidity sensor 13.

Description

  The present invention relates to a heat exchange ventilator that is mainly used in the field of ventilation and performs heat exchange between air supply and exhaust via a heat exchanger while performing simultaneous supply and exhaust ventilation.

  Due to the recent increase in needs for 24-hour ventilation (always ventilation), when heat exchange ventilators are used in areas where fog and soot frequently occur in the morning and evening, the product contains fog and soot due to ventilation. There is a high possibility that high-humidity air is supplied into the room from the outdoor inlet. If high-humidity air containing mist or haze is drawn into the heat exchange ventilator, the high-humidity air aggregates and condenses in the heat exchanger to become water and wets the heat exchanger. The exchange performance sometimes deteriorated.

  As a solution for such a problem, for example, as in Patent Document 1, a humidity sensor installed in the supply air passage, and a bypass air passage that is provided in parallel with the supply passage in the heat exchanger and bypasses the supply passage. And a damper for switching between the air supply passage and the bypass air passage, and the humidity of the outdoor air measured by the humidity sensor when the damper is in a heat exchange ventilation operation state in which the bypass air passage is closed and the air supply passage is opened is a reference. In the case of a value Ra or more, there is a heat exchange ventilator characterized in that the damper switches to a normal ventilation operation with the air supply passage closed and the bypass air passage side opened. With this configuration, if the humidity of the outdoor air exceeds the reference value during the heat exchange ventilation operation, it is possible to automatically switch to the normal ventilation operation in which the outdoor air does not flow to the heat exchanger. The deterioration of the performance of the exchanger can be prevented. Also, when the humidity of the outdoor air became below the reference value, the normal ventilation operation was maintained for a certain period of time and then the operation was automatically switched to the heat exchange ventilation operation.

JP 2011-220561 A

  As described above, the heat exchange ventilator of Patent Document 1 maintains the normal ventilation operation for a certain period of time even after the outdoor air becomes below the reference value. Therefore, heat exchange ventilation is not performed for a certain period of time even though outdoor air is flowed to the heat exchanger, even though it does not cause condensation or condensation in the heat exchanger. It was increasing. In addition, if the outdoor air is switched from the normal ventilation operation to the heat exchange ventilation operation immediately after the air becomes below the reference value, the bypass air passage is sealed with water adhering to the high humidity air, and the bypass air Water adhering to the road is difficult to dry and bad odor is likely to occur.

  The present invention has been made to solve the above-described problems, and provides a heat exchange ventilator capable of performing heat exchange ventilation at the same time as drying water adhering to a bypass air passage.

  A heat exchange ventilator according to the present invention has an air supply passage and an exhaust passage inside, and a heat exchanger that performs heat exchange between air passing through the air supply passage and air passing through the exhaust passage, An outdoor air inlet, an indoor air outlet, an indoor air inlet, and an outdoor air inlet are formed. The casing includes the heat exchanger therein, the casing is formed inside the casing, and passes through the air supply passage. A supply air passage connecting the outdoor suction port and the indoor outlet and an exhaust air passage formed inside the casing and connecting the indoor suction port and the outdoor outlet via the exhaust passage And an air supply blower that forms a flow of outdoor air from the outdoor inlet to the indoor outlet in the supply air passage, and an air outlet from the indoor inlet to the outdoor outlet in the exhaust air passage An exhaust blower for creating a flow of room air; A bypass air passage formed in the air passage so that the flow of the outdoor air bypasses the air supply passage, and provided upstream of the heat exchanger in the air supply passage, Air path switching means for opening and closing and opening and closing the air supply passage, humidity measuring means for measuring the humidity of the outdoor air flowing upstream from the heat exchanger in the air supply air path, and measured values of the humidity measuring means The control device for controlling the air path switching device from a normal ventilation operation that closes the air supply passage and opens the bypass air passage to a simultaneous ventilation operation that opens both the air supply passage and the bypass air passage based on It is characterized by having.

  In the heat exchange ventilator according to the present invention, the normal ventilation operation is switched to the simultaneous ventilation operation in which both the air supply passage and the bypass air passage of the heat exchanger are opened based on the measurement value of the humidity measuring means. Heat exchange ventilation can be performed at the same time as flowing outdoor air with humidity.

It is the schematic of the heat exchange ventilation apparatus at the time of the heat exchange ventilation operation | movement of this invention. It is the schematic of the heat exchange ventilation apparatus at the time of the normal ventilation driving | operation of this invention. It is the schematic of the heat exchange ventilation apparatus at the time of the simultaneous ventilation driving | operation of this invention. It is a flowchart figure showing the automatic switching control of the ventilation operation mode in Embodiment 1 of this invention. It is a flowchart figure showing the automatic switching control of the ventilation operation mode in Embodiment 2 of this invention. It is a flowchart figure showing the automatic switching control of the ventilation operation mode in Embodiment 3 of this invention. It is a flowchart figure showing the automatic switching control of the ventilation operation mode in Embodiment 4 of this invention.

Embodiment 1
FIG. 1 is a schematic view of a heat exchange ventilator during heat exchange ventilation operation of the present invention. FIG. 2 is a schematic view of a heat exchange ventilator during normal ventilation operation of the present invention. FIG. 3 is a schematic view of a heat exchange ventilator during simultaneous ventilation operation of the present invention.

  The heat exchange ventilator 100 includes a main body casing 2 formed in a rectangular parallelepiped box shape. A heat exchanger 1 is provided inside the main casing 2. The heat exchanger 1 has an air supply passage 1a and an exhaust passage 1b inside, and the air flowing in the air supply passage 1a and the air flowing in the exhaust passage 1b exchange heat. The air supply passage 1a and the exhaust passage 1b are formed independently of each other. Further, a bypass air passage 11 is provided inside the main body casing 2 so as to be provided with the heat exchanger 1. Since the air passing through the bypass air passage 11 does not pass through the heat exchanger 1, heat exchange is not performed.

  The main body casing 2 is provided with an outdoor air inlet 7 that communicates with the outdoor side via a duct and an indoor air outlet 8 that communicates with the indoor side via a duct. Inside the main casing 2, an air supply air passage 5 that connects the outdoor-side suction port 7 and the indoor-side air outlet 8 is formed. The supply air passage 5 is divided into a route that passes through the supply passage 1 a of the heat exchanger 1 and a route that bypasses the heat exchanger 1 and passes through the bypass air passage 11.

  Further, the main casing 2 is provided with an indoor suction port 9 that communicates with the room via a duct and an outdoor air outlet 10 that communicates with the outside via a duct. An exhaust air passage 6 is formed in the main body casing 2 to connect the indoor side inlet 9 and the outdoor air outlet 10 via the exhaust passage 1 b of the heat exchanger 1.

  The supply air blower 3 is provided in the supply air path 5. When the air supply blower 3 operates, outdoor air is sucked from the outdoor air inlet 7, passes through the air supply air passage 5, and is supplied into the room through the indoor air outlet 8. The exhaust blower 4 is provided in the exhaust air passage 6. When the exhaust blower 4 is operated, room air is sucked from the indoor side suction port 9, passes through the exhaust air passage 6, and is exhausted to the outside from the outdoor air outlet 10.

  A bypass air path switching plate 12 serving as air path switching means is provided at a branch point between the bypass air path 11 and the air supply path 1a upstream of the heat exchanger 1 in the air supply path 5. The bypass air passage switching plate 12 moves in the direction perpendicular to the air flow in the air supply air passage 5 to open and close the air supply passage 1 a and open and close the bypass air passage 11. Examples of the moving mechanism of the bypass air path switching plate 12 include a mechanism that combines a mechanical element that converts a rotational motion such as a rack and pinion into a linear motion and a motor capable of position control such as a servo motor.

  Depending on the position of the bypass air path switching plate 12, the ventilation operation mode of the heat exchange ventilator 100 is divided into three types of heat exchange ventilation operation, normal ventilation operation, and simultaneous ventilation operation.

  In the heat exchange ventilation operation, as shown in FIG. 1, the bypass air passage switching plate 12 is in a position where the air supply passage 1 a is opened and the bypass air passage 11 is closed. Since the route of the supply air passage 5 through the supply passage 1a is opened, the outdoor air sucked from the outdoor suction port 7 passes through the supply passage 1a and is supplied into the room. Further, the indoor air sucked from the indoor suction port 9 passes through the exhaust passage 1b of the heat exchanger 1 and is exhausted outside the room. Therefore, the heat exchange ventilator 100 during the heat exchange ventilation operation can ventilate the room by exchanging heat between the sucked indoor air and the sucked outdoor air.

  In the normal ventilation operation, the bypass air passage switching plate 12 is in a position where the air supply passage 1a is closed and the bypass air passage 11 is opened as shown in FIG. Since the route passing through the bypass air passage 11 of the air supply air passage 5 is opened, the outdoor air sucked from the outdoor air inlet 7 passes through the bypass air passage 11 and is supplied into the room. Therefore, the heat exchange ventilator 100 during normal ventilation operation can ventilate the room without exchanging heat between the sucked room air and the sucked outdoor air.

  In the simultaneous ventilation operation, the bypass air passage switching plate 12 is in a position where only a part of the bypass air passage 11 is opened as shown in FIG. Since both the route passing through the air supply passage 1a of the supply air passage 5 and the route passing through the bypass air passage 11 are opened, a part of the outdoor air sucked from the outdoor suction port 7 passes through the air supply passage 1a. The other air passes through the bypass air passage 11 and is supplied into the room. Therefore, the heat exchange ventilator 100 during the simultaneous ventilation operation performs heat exchange between a part of the outdoor air sucked and passed through the air supply passage 1a and the sucked indoor air and at the same time sucked into the bypass air passage 11 as well. Ventilation can be achieved by passing a part of the outdoor air.

  A humidity sensor 13 that is a humidity measuring means for detecting the humidity of the sucked outdoor air is provided upstream of the bypass air path switching plate 12 of the air supply air path 5. Further, the heat exchange ventilator 100 is provided with a control device 14 for controlling the position of the bypass air path switching plate 12 and the air volume of the air supply blower 3 and the exhaust blower 4. The control device 14 is connected to an external controller 15 such as a humidity sensor 13 and a remote controller. Based on signals from the humidity sensor 13 and the external controller 15, the control device 14 controls the position of the bypass air path switching plate 12 and the air volume of the supply air blower 3 and the exhaust air blower 4.

  Further, the heat exchange ventilator 100 is controlled by the external controller 15 to turn on / off the ventilation operation (ON-OFF), change the ventilation air flow (strength), change the ventilation operation mode (heat exchange ventilation operation or normal ventilation operation), and ventilation described later. ON / OFF of the automatic switching control of the operation mode can be arbitrarily set. When the ventilation operation is turned on by the external controller 15, the supply air blower 3 and the exhaust air blower 4 operate simultaneously. At this time, ventilation is performed based on the ventilation operation and the air volume selected by the external controller 15.

  Next, the automatic switching control of the ventilation operation mode in the first embodiment will be described. FIG. 4 is a flowchart showing the automatic switching control of the ventilation operation mode in the first embodiment.

  When the automatic switching control of the ventilation operation mode is started, it is first determined in step S10 whether or not the current ventilation operation mode of the heat exchange ventilator 100 is the heat exchange ventilation operation. If it is a heat exchange ventilation operation, the process proceeds to step S20, and if it is not a heat exchange ventilation operation, the process proceeds to step S40.

  In step S20, the control device 14 determines whether the humidity R% of the outdoor air detected by the humidity sensor 13 is equal to or higher than a first reference value Ra% set in advance, that is, R ≧ Ra. If it is determined that R ≧ Ra, the process proceeds to step S30. If it is determined that R <Ra, the process returns to the determination in step S20. The first reference value Ra% is a humidity reference for determining whether or not the outdoor air has a high humidity, and may be set to a humidity at which condensation or condensation occurs in the heat exchanger 1. In the present embodiment, description will be made on the assumption that Ra = 90% as an example.

  In step S30, the bypass air path switching plate 12 is moved from the state of FIG. 1 to the state of FIG. 2, the ventilation operation mode is changed from the heat exchange ventilation operation to the normal ventilation operation, and the process proceeds to step S40. In step S40, the controller 14 determines whether the humidity R% of the outdoor air detected by the humidity sensor 13 is less than the second reference value (Ra-5)%, that is, R <(Ra-5). . When it determines with R <(Ra-5), it progresses to step S50, and when it determines with R> = (Ra-5), it returns to determination of step S40. By setting the second reference value (Ra-5)% to a value lower than the first reference value Ra%, the outdoor air humidity R% varies outdoors around the first reference value Ra%. The ventilation operation mode is prevented from being frequently switched according to fluctuations in air humidity. Since Ra = 90% is assumed in the present embodiment, the second reference value is assumed to be (Ra-5) = 85%. Further, in this embodiment, the humidity difference is 5%, but the humidity difference is not limited to 5% as long as the ventilation operation mode is prevented from frequently switching.

  In step S50, the control device 14 moves the bypass air path switching plate 12 from the state of FIG. 2 to the state of FIG. 3, changes the ventilation operation mode from the normal ventilation operation to the simultaneous ventilation operation, and proceeds to step S60. In step S60, the control device 14 starts measurement of the simultaneous ventilation operation duration time t1 indicating how long the simultaneous ventilation operation time has continued, and proceeds to step S70. As a method for measuring the simultaneous ventilation operation continuation time t1, a timer is built in the control device 14, and the like.

  In step S70, the control device 14 determines whether the first set time Ta set in advance for the simultaneous ventilation operation duration t1 has elapsed, that is, whether t1 ≧ Ta. The first set time Ta is a time during which the simultaneous ventilation operation is continued until the water attached to the bypass air passage 11 is dried. In the present embodiment, description will be made on the assumption that Ta = 2 hours as an example, but the time is not limited to Ta = 2 hours as long as the water adhering to the bypass air passage 11 is dried.

  If it is determined in step S70 that t1 ≧ Ta, the control device 14 ends the measurement of the simultaneous ventilation operation duration time t1 in step S100, and then proceeds to step S110. In step S110, the control device 14 moves the bypass air path switching plate 12 from the state of FIG. 3 to the state of FIG. 1, changes the ventilation operation mode from the simultaneous ventilation operation to the heat exchange ventilation operation, and returns to step S20.

  If it is determined in step S70 that t1 <Ta, the process proceeds to step S80. In step S <b> 80, the control device 14 determines whether the current outdoor air humidity R% detected by the humidity sensor 13 is equal to or higher than a first reference value Ra% set in advance. When it is determined that R ≧ Ra, the measurement of the simultaneous ventilation operation continuation time t1 is completed in step S90, and then the process returns to step S30 to change the ventilation operation mode from the simultaneous ventilation operation to the normal ventilation operation. If it is determined that R <Ra, the process returns to step S70.

  With the above configuration and operation, normal ventilation operation is performed when high-humidity outdoor air such as fog or haze is generated, and even if water droplets adhere to the bypass air passage, simultaneous ventilation operation is performed for a certain period of time after normal ventilation operation is completed. By letting low-humidity air flow through the road, it is possible to dry the bypass air path. In the simultaneous ventilation operation, air is also passed through the heat exchanger, so that heat exchange ventilation can be performed even during drying in the bypass air passage, and loss of air conditioning energy can be reduced.

  Note that the volume of the sucked outdoor air passing through the bypass air passage 11 in the simultaneous ventilation operation is proportional to the area where the bypass air passage switching plate 12 opens the bypass air passage 11. Therefore, if the area for opening the bypass air passage 11 is increased, the amount of air passing through the bypass air passage 11 increases, and the bypass air passage 11 dries quickly. Conversely, if the area for opening the bypass air passage 11 is narrowed, the amount of air passing through the heat exchanger 1 increases, and the heat exchange efficiency during simultaneous ventilation operation increases. The area for opening the bypass air passage 11 in the simultaneous ventilation operation may be set uniformly, or may be arbitrarily set by the user with the external controller 15.

  Furthermore, in the heat exchange ventilator 100 according to the first embodiment, the supply air passage 5 and the bypass air passage 11 are switched by the bypass air passage switching plate 12, but the present invention is not limited to this, and the air supply air passage and the bypass air passage are provided. Can be used at the same time, conventional air path switching means such as the damper of Patent Document 1 may be used.

Embodiment 2
FIG. 5 is a flowchart of the automatic switching control in the ventilation operation mode in the second embodiment. The structure of the heat exchange ventilator 100 is the same as that of the first embodiment. Next, a flowchart of the automatic switching control of the ventilation operation mode in the second embodiment will be described. The control flowchart of the second embodiment is substantially the same as the control flowchart of the first embodiment except that steps S21 to S25 and steps S41 to S45 are added. Therefore, the description of the same parts as those in Embodiment 1 is omitted.

  In step S20, when the control device 14 determines that R ≧ Ra, the process proceeds to step S21. In step S21, the control device 14 starts measuring the high humidity duration time t2 indicating how long the high humidity state of the outdoor humidity continues, and proceeds to step S22. As a method for measuring the high humidity duration time t2, a timer for measuring the simultaneous ventilation operation measurement time t1 may be used.

  In step S22, the control device 14 determines whether the high humidity continuation time t2 has passed a preset second set time Tb, that is, whether t2 ≧ Tb. The second set time Tb is a set time for determining whether or not the outdoor humidity is stable in a high humidity state with the first reference value Ra% or more. In the present embodiment, description will be made on the assumption that Tb = 2 hours as an example, but it is not limited to Tb = 2 hours as long as it can be determined whether the outdoor humidity is stable in a high humidity state.

  If it is determined in step S22 that t2 ≧ Tb, the control device 14 ends the measurement of the high humidity duration time t2 in step S25 and then proceeds to step S30. In step S30, the control device 14 heats the ventilation operation mode. Switch from exchange ventilation operation to normal ventilation operation.

  If it is determined in step S22 that t2 <Tb, the process proceeds to step S23. In step S23, the control device 14 determines whether the humidity R% of the current outdoor air detected by the humidity sensor 13 is equal to or higher than a preset first reference value Ra%. If it is determined that R ≧ Ra, the control device 14 ends the measurement of the high humidity duration time t2 in step S24 and returns to step S20. If it is determined that R <Ra, the process returns to step S22.

  In step S40, if the control device 14 determines that R <(Ra-5), the process proceeds to step S41. In step S41, the control device 14 starts measuring the low humidity duration time t3 indicating how long the low humidity state of the outdoor humidity continues, and proceeds to step S42. As a method for measuring the low humidity duration time t3, a timer for measuring the simultaneous ventilation operation measurement time t1 as in the high humidity duration time t2 may be used.

  In step S42, the control device 14 determines whether the low humidity continuation time t3 has passed a preset third set time Tc, that is, whether t3 ≧ Tc. The third set time Tc is a set time for determining whether or not the outdoor humidity is stable in a low humidity state with the first reference value Ra% or less. In the present embodiment, the description will be made assuming that Tc = 30 minutes as an example, but is not limited to Tc = 30 minutes as long as it can be determined whether the outdoor humidity is stable in a low humidity state. Further, since the current outdoor air humidity R% is not more than the first reference value Ra% in the determination in step S40, the time required for determining outdoor humidity stability may be short.

  If it is determined in step S42 that t3 ≧ Tc, the control device 14 ends the measurement of the low humidity duration time t3 in step S45, and then proceeds to step S50. In step S50, the control device 14 switches the ventilation operation mode from the normal ventilation operation to the simultaneous ventilation operation.

  If it is determined in step S42 that t3 <Tc, the process proceeds to step S43. In step S43, the control device 14 determines whether or not the current outdoor air humidity R% detected by the humidity sensor 13 is equal to or higher than a preset first reference value Ra%. If it is determined that R ≧ Ra, the control device 14 ends the measurement of the low humidity duration time t3 in step S44 and returns to step S40. If it is determined that R <Ra, the process returns to step S42.

  As described above, the heat exchange ventilator according to the second embodiment measures the outdoor humidity for a certain period of time before switching between the normal ventilation operation and the simultaneous ventilation operation, and determines whether the outdoor humidity is stable. Therefore, the ventilation operation mode is prevented from frequently switching even when the detected value of the humidity sensor fluctuates greatly, such as using an inexpensive and low-precision humidity sensor for the humidity sensor 13.

Embodiment 3
FIG. 6 is a flowchart of the automatic switching control in the ventilation operation mode in the third embodiment. The structure of the heat exchange ventilator 100 is the same as that of the first embodiment. Next, a flowchart of the automatic switching control of the ventilation operation mode in the third embodiment will be described. The control flowchart of the third embodiment is substantially the same as the control flowchart of the second embodiment except that steps S51, S91, and S111 are added. Therefore, the description of the same parts as those in Embodiment 2 is omitted.

  In step S50, the control device 14 moves the bypass air path switching plate 12 to change the ventilation operation mode from the normal ventilation operation to the simultaneous ventilation operation, and then proceeds to step S51. In step S51, the control device 14 forcibly changes the supply air amount to a weak air amount, and proceeds to step S60. Note that step S51 is executed after step S50 is executed. However, the present invention is not limited to this. For example, the position of step S51 is from step S45 to step S60, for example, at the same time as the change in ventilation mode or at the end of t3 measurement. If it is between.

  Further, after the measurement of t1 is completed in step S90, the process proceeds to step S91. In step S91, the control device 14 returns the supply air volume to the supply air volume before the change in step S51, that is, the air volume set by the external controller 15, and returns to step S30. In addition, although it progresses to step S91 after completion | finish of step S90, it is not restricted to this, The position of step S91 should just be between step S30 after R> Ra is determined to be true in step S80.

  In step S110, the control device 14 moves the bypass air path switching plate 12 to change the ventilation operation mode from the simultaneous ventilation operation to the heat exchange ventilation operation, and then proceeds to step S111. In step S111, similarly to step S91, the control device 14 returns the supply air volume to the air volume set by the external controller 15, and returns to step S20. Note that step S111 is executed after step S110 is executed. However, the present invention is not limited to this, and similarly to step S51, between step S110 and step S20, for example, at the same time as switching the ventilation operation mode or immediately before switching. If it is good.

  In the simultaneous ventilation operation, since a part of the supply airflow flows through the bypass air passage, the heat exchange efficiency is inferior to the heat exchange ventilation operation in which the entire supply airflow flows to the heat exchanger and heat is exchanged. In general, it is known that the heat exchange efficiency of the heat exchange ventilator increases as the amount of supplied air decreases. Therefore, the heat exchange ventilator according to the third embodiment can select the air volume that is selectable and has the smallest air supply volume by forcibly changing the supply air volume when performing the simultaneous ventilation operation to the weak air volume. Since the heat exchange efficiency is improved, the loss of air conditioning energy can be further reduced.

  The flowchart of the automatic switching control of the ventilation operation mode of the third embodiment is based on the flowchart of the automatic switching control of the ventilation operation mode of the second embodiment, but is not limited to this, and the ventilation operation of the first embodiment. It may be based on a flowchart of automatic mode switching control. In this case, step S91 and step S111 are provided in the same place as in the third embodiment, and step S51 is provided between step S40 and step S60 after R <(Ra-5) is determined to be true. That's fine.

  Further, in the third embodiment, only the supply air amount is changed to the weak air amount in step S51. However, the present invention is not limited to this, and the exhaust air amount may be changed simultaneously with the change of the supply air amount. Generally, if the exhaust air flow rate> the supply air flow rate, the greater the difference between the exhaust air flow rate and the supply air flow rate, the higher the heat exchange efficiency. Therefore, by changing the supply air flow rate to a weak air flow and simultaneously changing the exhaust air flow to a strong air flow rate The difference between the exhaust air volume and the supply air volume is further increased, and the loss of air conditioning energy can be further reduced. Further, by changing the supply air volume to the weak air volume and simultaneously changing the exhaust air volume to the weak air volume, the exhaust air volume and the supply air volume can be balanced, and negative pressure in the room can be prevented.

  In the third embodiment, the supply air volume is changed to the weak air volume in step S51. However, the present invention is not limited to this, and conversely, the supply air volume may be changed to the strong air volume. In this case, the heat exchange efficiency is lowered because the amount of supplied air is increased, but the amount of supplied air flowing through the bypass air passage 11 is increased and the bypass air passage 11 dries faster, so the first set time Ta can be set short. It is possible to return to heat exchange ventilation operation earlier.

Embodiment 4
FIG. 7 is a flowchart of the automatic switching control of the ventilation operation mode in the fourth embodiment. The structure of the heat exchange ventilator 100 is the same as that of the first embodiment. Next, a flowchart of the automatic switching control of the ventilation operation mode in the fourth embodiment will be described. The control flowchart of the fourth embodiment is substantially the same as the control flowchart of the third embodiment except that step S51 and step S91 are omitted and step S31 is added. Therefore, description of the same parts as those in Embodiment 3 is omitted.

  In step S30, the control device 14 moves the bypass air path switching plate 12 to change the ventilation operation mode from the heat exchange ventilation operation to the normal ventilation operation, and then proceeds to step S31. In step S31, the control device 14 forcibly changes the supply air volume to a weak air volume, and the process proceeds to step S40. Although step S31 is executed after step S30 is executed, the present invention is not limited to this. For example, the position of step S31 is changed from step S25, for example, when the ventilation operation mode is switched to simultaneous ventilation operation or simultaneously with the end of t2 measurement. It may be between step S40.

  The heat exchange ventilator 100 according to the fourth embodiment is effective not only in the case of performing the simultaneous ventilation operation but also in the case of performing the normal ventilation operation. In addition, it is possible to suppress the inflow of high-humidity air into the room to some extent during normal ventilation operation and to suppress the increase in indoor humidity.

  The flowchart of the automatic switching control of the ventilation operation mode of the fourth embodiment is based on the flowchart of the automatic switching control of the ventilation operation mode of the third embodiment, but is not limited thereto, and the ventilation operation of the first embodiment is not limited thereto. It may be based on a flowchart of automatic mode switching control. In that case, step S31 may be provided between step S20 and step S40 after R ≧ Ra is determined to be true.

  In the third embodiment and the fourth embodiment, the supply air amount is lowered by forcibly changing to the weak air amount. However, the present invention is not limited to this, and for example, the supply air amount is set by the external controller 15. It suffices if the supply air volume can be reduced, for example, by changing the supply air volume by a certain ratio.

  In addition, the heat exchange ventilator of the third and fourth embodiments has only two types of ventilation airflows that can be set by the external controller 15, but is not limited to this, for example, a plurality of such as strong, medium and weak The number of steps is not limited as long as it is a step. In addition, when there are three or more levels of ventilation air flow that can be set, not only the air flow rate is forcibly changed to the smallest air flow rate when reducing the air supply air flow, but there are three levels, for example, strong, medium and weak In this case, if the strong air volume is selected by the external controller 15, it is changed to the medium air volume. Similarly, if the medium air volume is set, the air volume is changed to the weak air volume. If it is selected, the air volume may be changed to an air volume one step lower than the air volume selected by the external controller 15 such as leaving the weak air volume.

  Further, the flow chart of the automatic switching control of the ventilation operation mode from the first embodiment to the fourth embodiment may be selected by the external controller 15.

DESCRIPTION OF SYMBOLS 1 Heat exchanger, 1a Air supply path, 1b Exhaust path, 2 Main body casing, 3 Supply air blower, 4 Exhaust air blower, 5 Supply air path, 6 Exhaust air path, 7 Outdoor side inlet, 8 Indoor side outlet, 9 Indoor suction port, 10 outdoor air outlet, 11 bypass air passage, 12 bypass air passage switching plate, 13 humidity sensor, 14 control device, 15 external controller, 100 heat exchange ventilator

Claims (8)

A heat exchanger having an air supply passage and an exhaust passage inside to exchange heat between air passing through the air supply passage and air passing through the exhaust passage;
An outdoor air inlet, an indoor air outlet, an indoor air inlet and an outdoor air inlet, and a casing provided with the heat exchanger inside;
An air supply air passage formed inside the casing and connecting the outdoor-side suction port and the indoor-side air outlet through the air supply passage;
An exhaust air passage formed inside the casing and connecting the indoor-side suction port and the outdoor-side air outlet through the exhaust passage;
An air supply blower that forms a flow of outdoor air from the outdoor inlet to the indoor outlet in the supply air passage;
An exhaust air blower that forms a flow of room air from the indoor air inlet to the outdoor air outlet in the exhaust air passage;
A bypass air passage formed in the air supply air passage and formed so that the flow of the outdoor air bypasses the air supply passage;
An air path switching means provided on the upstream side of the heat exchanger of the air supply passage, for opening and closing the bypass air passage and opening and closing the air supply passage;
Humidity measuring means for measuring the humidity of the outdoor air flowing upstream from the heat exchanger in the supply air path;
Based on the measurement value of the humidity measuring means, the air path switching device is operated from a normal ventilation operation that closes the air supply passage and opens the bypass air passage, and a simultaneous ventilation operation that opens both the air supply passage and the bypass air passage. And a control device for controlling,
A heat exchange ventilator characterized by comprising: The control device controls the air path switching unit from the normal ventilation operation to the simultaneous ventilation operation when the normal ventilation operation is performed and the measured value of the humidity measuring unit is less than a second reference value. The heat exchange ventilator according to claim 1. When the control device maintains the simultaneous ventilation operation for a first preset time or longer, the control device opens the air supply passage from the simultaneous ventilation operation to open the bypass air flow. The heat exchange ventilator according to claim 1 or 2, wherein the heat exchange ventilator is controlled to be in a state of heat exchange ventilation operation in which the path is closed. The control device is the heat exchange ventilation operation, and when the measured value of the humidity measurement means is equal to or higher than a first reference value, the air path switching means is changed from the heat exchange ventilation operation to the normal ventilation operation. The heat exchange ventilator according to claim 3, wherein the heat exchange ventilator is controlled. The heat according to any one of claims 1 to 4, wherein the control device can control the air volume of the supply air blower, and changes the air volume of the supply air blower when the air path switching means is switched. Exchange ventilation device. 6. The heat exchange ventilator according to claim 5, wherein the control device lowers an air supply air amount when the air path switching device is switched from the heat exchange ventilation operation to the normal ventilation operation. 6. The heat exchange ventilator according to claim 5, wherein the control device lowers an air supply air amount when the air path switching device is switched from the normal ventilation operation to the simultaneous ventilation operation. The heat exchange ventilator according to claim 6 or 7, wherein the control device increases the air supply air amount when the air path switching device is switched from the simultaneous ventilation operation to the heat exchange ventilation operation.

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