Ventilation device and ventilation method

Abstract

To provide a ventilation device and a ventilation method capable of achieving energy saving and improvement in indoor environmental hygiene.SOLUTION: A ventilation device 20 includes an air supply passage S1 for taking outside air into a room 10, and an exhaust passage E1 for discharging the air in the room 10 to the outside of the room. The ventilation device 20 includes a total heat exchanger 21 for exchanging heat of the air passing through the exhaust passage E1 and heat of the air passing through the air supply passage S1, and an air supply fan B1 and an exhaust fan B2 respectively provided in the air supply passage S1 and the exhaust passage E1. The ventilation device 20 includes a communication passage C1 for returning the air taken from an air return duct RA into the room 10, and an air sterilization device 22 through which the air passing through the communication passage C1 passes until the air is returned to the room 10. The ventilation device 20 includes a control unit for controlling a circulation amount of the air passing through the communication passage C1 on the basis of an amount of CO2 from a CO2 sensor 40.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a ventilation device and a ventilation method for taking in outside air and exchanging indoor air. [Background technology]

[0002] In large buildings such as shopping malls and buildings, in addition to air conditioners that adjust the temperature, ventilation equipment that ventilates the room is installed. This ventilation equipment exchanges the air inside the room with outside air for environmental hygiene within the building. In this case, for example, a ventilation equipment equipped with a total heat exchanger is known as an energy saving measure (see, for example, Patent Document 1). The ventilation equipment described in this document is equipped with a total heat exchange element that exchanges heat between the air passing through the intake air flow path and the air passing through the exhaust air flow path without mixing them, and a control unit that drives the intake air fan and the exhaust fan according to the detection result of the carbon dioxide sensor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-050273 A Summary of the Invention [Problem to be solved by the invention]

[0004] Conventionally, as described above, in order to save energy, a ventilation device takes in air from inside a room in an amount corresponding to the amount of carbon dioxide inside the room and exchanges it with outside air. On the other hand, as a measure against infectious diseases caused by viruses, it is desirable to exchange indoor air with outside air as much as possible in order to increase the cleanliness of the air. In this case, if all the indoor air taken in is exchanged with outside air, the indoor air that has been adjusted to the appropriate temperature is discharged outside, and the outside air is heated or cooled so that it is close to room temperature. Therefore, it has been difficult to achieve both energy conservation and indoor environmental hygiene. [Means for solving the problem]

[0005] A ventilation device that solves the above-mentioned problems comprises an air intake path section that takes in outside air into a room, an exhaust path section that exhausts the air inside the room to the outside, a total heat exchanger that exchanges heat between the air passing through the exhaust path section and the air passing through the air intake path section, and blowers provided respectively in the air intake path section and the exhaust path section, and replaces part of the air inside the room with the outside air, and further comprises a communication path section that returns the air inside the room taken in from a return air duct to the room, an air sterilization device through which the air that has passed through the communication path section passes before being returned to the room, and a control section that controls the amount of return air passing through the communication path section based on detection information from a sensor that identifies the environmental conditions inside the room.

[0006] In addition, a ventilation method that solves the above problem is a ventilation device that replaces part of the air in a room with outside air, and supplies the taken-in outside air to the room via a total heat exchanger and an air sterilization device, and returns at least a part of the air taken in from the room to the room via the air sterilization device. Effect of the Invention

[0007] According to the present invention, it is possible to improve indoor environmental hygiene while saving energy. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a system diagram of the ventilation device according to the embodiment. [Diagram 2] FIG. 2 is a configuration diagram illustrating control of the ventilation device according to the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, a specific embodiment of a ventilation device and a ventilation method will be described with reference to Figures 1 and 2. In this embodiment, a ventilation device that ventilates a part of indoor air with outside air will be described. As shown in Fig. 1, a building is provided with an air conditioning device 15 that adjusts the temperature and humidity of a room 10. The air conditioning device 15 humidifies or dehumidifies, heats or cools the air taken in from the room 10 so that the air has a set humidity and temperature, and then supplies the air to the room 10.

[0010] The ventilation device 20 ventilates the room 10 of the building. An air supply path section S1 and an exhaust path section E1 are formed separately inside the ventilation device 20. The air supply path section S1 is a flow path that supplies air from outside the room 10 (outside air) to the room 10. The exhaust path section E1 is a flow path that exhausts air from inside the room 10 to the outside.

[0011] A total heat exchanger 21 is provided inside the ventilation device 20, traversing both the air supply path section S1 and the exhaust path section E1. The total heat exchanger 21 exchanges heat between the air exhausted from the exhaust path section E1 to the outside of the room and the air supplied from the air supply path section S1 to the room 10.

[0012] In the air supply path section S1, an outdoor air intake duct OA, an outdoor temperature and humidity sensor 31, an outdoor air damper 35, and a filter f1 are arranged on the outdoor side of the total heat exchanger 21. The outdoor temperature and humidity sensor 31 measures the temperature and humidity of the taken-in outdoor air. This outdoor temperature and humidity sensor 31 may be installed in the air supply path section S1 as shown in FIG. 1, or may be installed outside (outdoors) of the ventilation device 20. The outdoor air damper 35 is an air volume adjustment device that adjusts the amount of supply air taken in by the outdoor air. This outdoor air damper 35 may be installed in the air supply path section S1 as shown in FIG. 1, or may be set outside (outdoors) of the ventilation device 20. The positions of the outdoor temperature and humidity sensor 31 and the outdoor air damper 35 may be reversed. In addition, the filter f1 removes dust and dirt from the taken-in outdoor air.

[0013] In the air supply path section S1, an air sterilization device 22, a cooling and heating coil 23, a humidifier 24, an air supply fan B1, and an air supply temperature sensor 32 are arranged in a line from the total heat exchanger 21 toward the room 10. The air sterilization device 22 is a device that sterilizes viruses and bacteria floating in the air. The cooling and heating coil 23 is a heat exchanger that cools or heats the outside air that has passed through the total heat exchanger 21 to bring it closer to a target value of temperature measured by the air supply temperature sensor 32. The humidifier 24 humidifies the outside air that has passed through the cooling and heating coil 23 in winter to bring it closer to a target value of humidity measured by the room temperature and humidity sensor 41 described later. The air supply fan B1 is a blower that sends the air that has passed through the air supply path section S1 of the ventilation device 20 into the room 10. The air supply temperature sensor 32 may be installed in the air supply path section S1 as shown in FIG. 1, or may be installed outside the ventilation device 20 (in the room 10).

[0014] The exhaust path E1 includes return air ducts RA and CO 2 The sensor 40, the indoor temperature and humidity sensor 41, the exhaust fan B2, and the filter f2 are arranged in a line. CO 2 The sensor 40 detects the amount of CO contained in the air taken in from the room 10. 2 The indoor temperature and humidity sensor 41 measures the temperature and humidity of the air taken in from the room 10. 2 The sensor 40 and the indoor temperature and humidity sensor 41 may be installed in the exhaust path E1 as shown in Fig. 1, or may be installed outside the ventilation device 20 (in the room 10). The exhaust fan B2 is a blower that sends the air introduced from the room 10 into the exhaust path E1 of the ventilation device 20 to the outside of the room via the exhaust duct EA. The filter f2 removes dust, dirt, etc. from the air taken in from the room 10.

[0015] In the exhaust path section E1, an exhaust damper 45 and an exhaust duct EA are provided side by side on the outdoor side of the total heat exchanger 21. The exhaust damper 45 is an air volume adjustment device that adjusts the amount of exhaust air that passes through the total heat exchanger 21 in the exhaust path section E1 and is exhausted to the outside of the room 10. The exhaust damper 45 may be installed in the exhaust path section E1 as shown in FIG. 1, or may be installed outside the ventilation device 20 (outdoors).

[0016] Furthermore, in the exhaust path E1, a communication path C1 communicating with the supply path S1 is provided between the total heat exchanger 21 and the filter f2. This communication path C1 is a path that sends a part of the air taken in from the room 10 and passing through the filter f2 of the exhaust path E1 to the upstream side of the air sterilization device 22 in the supply path S1.

[0017] The communication path section C1 is provided with a return air damper 48. The return air damper 48 is an air volume adjustment device that adjusts the volume of return air that passes through the filter f2 of the exhaust path section E1 and is sent to the supply air path section S1. Therefore, the air that passes through the communication path section C1 and is returned to the supply air path section S1 passes through the air sterilization device 22, the cooling / heating coil 23, the humidifier 24, the supply air fan B1, and the supply air temperature sensor 32, and is supplied to the room 10.

[0018] (Control unit) Next, the control unit 50 of the ventilation device 20 having the above-mentioned configuration will be described with reference to FIG. The control unit 50 2 connected to the sensor 40, 2 CO contained in the air taken in from the room 10 measured by the sensor 40 2 The concentration is acquired as detection information.

[0019] Furthermore, the control unit 50 is connected to the outdoor air damper 35, the exhaust damper 45, and the return air damper 48, and controls the volume of air passing through each damper (35, 45, 48). In this embodiment, the control unit 50 controls the outdoor air damper 35 and the exhaust damper 45 to have an air volume of 30% to 100%, assuming that the maximum air volume supplied to the room 10 is 100%. Furthermore, the control unit 50 controls the return air damper 48 to have an air volume of 70% to 0%.

[0020] The control unit 50 also includes a mode specifying unit 51 and an airflow setting unit 52 . The mode specification unit 51 specifies the operation mode of the ventilation device 20. In this embodiment, a first mode and a second mode are used as the operation modes. The first mode is a mode that prioritizes air quality, and fixes the supply air volume to the maximum volume (100%). In this case, the CO 2 The air volume of the return air damper 48 is changed according to the concentration. On the other hand, the second mode is a mode that prioritizes energy saving in particular, and the CO 2 Depending on the amount (concentration), the amount (airflow) of air taken in from the room 10 is changed. In this case, the airflow in the return air damper 48 is set to 0%. The air volume setting unit 52 is 2 The air volumes of the outside air damper 35, the exhaust air damper 45 and the return air damper 48 are specified according to the concentration.

[0021] The control unit 50 also controls the driving of the supply air fan B1 and the exhaust air fan B2. Furthermore, the control unit 50 is connected to the temperature and humidity sensors (31, 41), the supply air temperature sensor 32, the cooling and heating coil 23, the humidifier 24, and the total heat exchanger 21. The control unit 50 obtains the air temperature from the supply air temperature sensor 32, and the air temperature and humidity from the temperature and humidity sensors (31, 41). Then, the control unit 50 controls the cooling and heating coil 23 and the humidifier 24 to supply air from the supply air path S1 to the room 10 at temperatures and humidity close to the set temperatures and humidity. Furthermore, the control unit 50 normally operates the total heat exchanger 21 while the ventilation device 20 is operating. Then, when the control unit 50 determines that the enthalpy of the outside air is lower than the enthalpy of the room 10 in summer, it stops the total heat exchanger 21.

[0022] (Ventilation method) Next, a method for ventilating the room 10 using the above-mentioned ventilation device 20 will be described. First, the mode specifying unit 51 of the control unit 50 specifies the set operation mode.

[0023] (First mode) When the first mode is detected, the air volume setting unit 52 of the control unit 50 sets the CO 2 Sensor 40 to CO 2 The airflow setting unit 52 then acquires the CO 2 Depending on the concentration, the air volumes of the outside air damper 35 and the exhaust damper 45 are determined. Furthermore, the air volume setting unit 52 sets the air supply fan B1 and the exhaust fan B2 to the maximum air volume (100%) and drives them. In this case, the minimum airflow rate is 30%, and the CO 2 A constant amount of outside air is ensured to be taken into the room 10 regardless of the concentration. Specifically, when the determined air volume is less than 30%, the control unit 50 sets the outside air damper 35 and the exhaust damper 45 to the lower limit air volume (30%) and the air volume of the return air damper 48 to 70%.

[0024] Furthermore, when the determined air volume is 30% or more, the control unit 50 sets the same air volume (30% to 100%) in the outdoor air damper 35 and the exhaust damper 45. Then, the control unit 50 sets the air volume (70% to 0%) obtained by subtracting the air volumes set in the outdoor air damper 35 and the exhaust damper 45 from 100% as the air volume of the return air damper 48. Furthermore, the control unit 50 drives the total heat exchanger 21, the air sterilization device 22, the cooling / heating coil 23, and the humidifier 24.

[0025] Then, the air taken in from the room 10 through the return air duct RA passes through the exhaust path section E1. Part of the air passes through the total heat exchanger 21 and is discharged to the outside air, and the remaining air passes through the connection path section C1. Meanwhile, the outside air taken in from the outside air intake duct OA passes through the total heat exchanger 21 of the supply air path section S1 and is mixed with the air that has passed through the connection path section C1 just before the air sterilization device 22. Then, the mixed air passes through the air sterilization device 22 and is sterilized, heated or cooled in the cooling / heating coil 23, humidified by the humidifier 24, and supplied to the room 10. As a result, part of the air taken in from the room 10 is mixed with the taken-in outside air and is sterilized by the air sterilization device 22, and is supplied again to the room 10.

[0026] (Second mode) When the second mode is detected, the air volume setting unit 52 of the control unit 50 sets the CO 2 Sensor 40 to CO 2 The airflow setting unit 52 then acquires the CO 2 The air volumes of the supply air fan B1 and the exhaust air fan B2 are determined according to the concentration, and their drive is controlled. In this case, the air volume of the return air damper 48 is set to "0". Here, the determined air volume is set to 30% as the lower limit, and when the determined air volume is less than 30%, the control unit 50 drives the intake fan B1 and the exhaust fan B2 at the lower limit air volume of 30% (constant). 2 A constant amount of outside air is taken into the room 10 regardless of the concentration.

[0027] On the other hand, when the determined air volume is 30% or more, the control unit 50 controls the drive of the supply air fan B1 and the exhaust air fan B2 to the same determined air volume (30% to 100%). Then, the control unit 50 drives the total heat exchanger 21, the air sterilization device 22, the cooling / heating coil 23, and the humidifier 24. As a result, a part of the air in the room 10 is replaced with outside air, the amount of which is supplied according to the amount of air taken in from the room 10 and discharged to the outside.

[0028] (action) In the first mode, the control unit 50 of the ventilation device 20 takes in a maximum amount of air from the room 10. Then, at least a part of the taken-in air from the room 10 is supplied to the air supply path section S1 via the communication path section C1, passed through the air sterilization device 22, and supplied again to the room 10. As a result, the air in the room 10 that is not exchanged with outside air is returned to the room 10 after being sterilized by the air sterilization device 22, thereby reducing the energy required for cooling and heating, and air close to the temperature of the room 10 can be supplied to the room 10.

[0029] According to this embodiment, the following effects can be obtained. (1) In the first mode, the ventilation device 20 of this embodiment takes in a maximum amount of air from the room 10. Then, a part of the taken-in air is passed through the air sterilization device 22 via the communication path section C1 and is supplied again to the room 10. As a result, the air in the room 10 is sterilized and returned to the room 10, so that the environmental hygiene of the air in the room 10 can be improved while saving energy.

[0030] (2) In the ventilation device 20 of the present embodiment, when the determined air volume is 30% or more in the first mode, the maximum amount of air taken in from the room 10 is reduced by 10%. 2 The amount of air corresponding to the concentration is exchanged with outside air. 2 If the concentration increases, the CO 2 By taking in outside air according to the concentration, you can save energy while reducing CO 2 Based on this, the environmental hygiene of the air in the room 10 can be improved.

[0031] (3) In the ventilation device 20 of the present embodiment, the communication path section C1 is provided in the air supply path section S1 before the air sterilization device 22. This allows the taken-in outside air and the air returned to the room 10 to be sterilized in the same air sterilization device 22 and then supplied to the room 10.

[0032] (4) The ventilation device 20 of this embodiment includes a total heat exchanger 21 that crosses both the intake air path section S1 and the exhaust air path section E1. This allows the thermal energy of the air in the room 10 that is discharged to the outside to be transferred to the outside air that is taken in from the outside. This allows the thermal energy to be used efficiently, thereby saving energy.

[0033] This embodiment can be modified as follows: This embodiment and the following modifications can be combined with each other to the extent that there is no technical contradiction. In the above embodiment, the air filtering device 22 is provided in the air supply path S1 of the ventilation device 20 at a position adjacent to the indoor 10 side of the total heat exchanger 21. The arrangement of the air filtering device 22 is not limited to this. For example, an air filtering device through which outside air passes may be provided upstream of a point where the air that has passed through the communication path is mixed, and an air filtering device may be provided in the communication path separately from this air filtering device.

[0034] The control unit 50 of the ventilation device 20 of the above embodiment controls the CO 2 CO contained in the air in the room 10 measured by the sensor 40 2 The volume of air taken in from outside was set based on the concentration. The volume of air taken in from outside can be set based on the detection information that can identify the environmental condition of the air in the room 10. 2 It is not limited to the case where the concentration is used. For example, the air volume for taking in outside air may be specified according to the number of people in the room 10. Specifically, the control unit 50 installs a camera in the room 10 as a sensor for specifying the environmental condition of the room 10. Then, the control unit 50 obtains a captured image of the room 10 from the camera. Next, the control unit 50 calculates the number of people in the room 10 (indoor environmental condition) by image processing of the captured image. Then, the control unit 50 sets the air volume for taking in outside air according to the number of people.

[0035] Next, the technical ideas that can be understood from the above embodiment and other examples will be described below. (a) The ventilation device according to any one of claims 1 to 3, characterized in that the control unit determines the amount of exhaust air to be discharged outside the room and the amount of supply air to be returned to the room, depending on the amount of carbon dioxide in the room. (b) The ventilation device according to claim 1, characterized in that an air conditioning device for adjusting a temperature inside the room is provided inside the room. [Explanation of symbols]

[0036] B1...supply fan, B2...exhaust fan, C1...connection path, E1...exhaust path, f1, f2...filter, OA...outdoor air intake duct, RA...return air duct, S1...supply path, 10...room, 15...air conditioning device, 20...ventilation device, 21...total heat exchanger, 22...air sterilization device, 23...cooling / heating coil, 24...humidifier, 31...outdoor temperature / humidity sensor, 32...supply air temperature sensor, 35...outdoor air damper, 40...CO 2 Sensor, 41... indoor temperature and humidity sensor, 45... exhaust damper, 48... return air damper, 50... control unit, 51... mode specification unit, 52... air volume setting unit.

Claims

1. An air intake path that takes in outside air into the room; An exhaust path portion that exhausts air from inside the room to the outside; a total heat exchanger that exchanges heat between air passing through the exhaust path and air passing through the intake path; a first fan and a second fan provided in the air supply path portion and the air exhaust path portion, A ventilation device that replaces a portion of the air in the room with the outside air, A communication path portion that returns the indoor air taken in through a return air duct to the indoor air; A first air flow rate adjusting device provided in the communication path portion and configured to adjust an amount of return air sent to the air supply path portion; an air filtering device through which the air that has passed through the communication path portion passes before being returned to the room; A control unit that controls the amount of return air passing through the communication path unit based on detection information of a CO2 concentration from a sensor that specifies the indoor environmental condition, The communication path section and the air filtering device are disposed on the indoor side of the total heat exchanger in the air supply path section, The air filtering device is disposed on the indoor side of the communication path section, thereby filtering out the taken-in outside air and the air supplied to the air supply path section through the communication path section, The control unit is When a setting that prioritizes air quality is acquired, a first mode is executed in which the first blower and the second blower are set to maximum air volumes and the return air volume of the first air volume adjustment device is changed according to the CO2 concentration; A ventilation device characterized in that, when a setting that prioritizes energy saving is obtained, the return air volume by the first air volume control device is set to "0" and a second mode is executed in which the air volumes of the first blower and the second blower are changed in accordance with the CO2 concentration.

2. a second airflow adjustment device that is disposed on an outdoor side of the total heat exchanger in the air supply path portion and adjusts an amount of the air supply that is taken in from the outside; The ventilation device according to claim 1, further comprising a third air volume adjustment device arranged on the outdoor side of the total heat exchanger in the exhaust path section and adjusting the exhaust volume of the air that has passed through the total heat exchanger and is exhausted outside the room.

3. A ventilation method for a ventilation device that replaces a portion of indoor air with outside air, comprising the steps of: The ventilation system is an air supply path portion that takes in the outside air into the room; An exhaust path portion that exhausts air from the room to the outside; a total heat exchanger that exchanges heat between air passing through the exhaust path and air passing through the intake path; a first fan and a second fan provided in the air supply path portion and the air exhaust path portion, respectively; A communication path portion that returns the indoor air taken in through a return air duct to the indoor air; A first air flow rate adjusting device provided in the communication path portion and configured to adjust an amount of return air sent to the air supply path portion; an air filtering device through which the air that has passed through the communication path portion passes before being returned to the room; A control unit that controls the amount of return air passing through the communication path unit based on detection information of a CO2 concentration from a sensor that specifies the indoor environmental condition, The communication path section and the air filtering device are disposed on the indoor side of the total heat exchanger in the air supply path section, The air filtering device is disposed on the indoor side of the communication path section, thereby filtering out the taken-in outside air and the air supplied to the air supply path section through the communication path section, The control unit is When a setting that prioritizes air quality is acquired, a first mode is executed in which the first blower and the second blower are set to maximum air volumes and the return air volume of the first air volume adjustment device is changed according to the CO2 concentration; A ventilation method characterized by executing a second mode in which, when a setting that prioritizes energy saving is obtained, the return air volume by the first air volume control device is set to "0" and the air volumes of the first blower and the second blower are changed in accordance with the CO2 concentration.

Images