JP6322814B2 - Heat exchange ventilator - Google Patents

Description

  The present invention relates to a heat exchange type ventilator for exchanging heat between outside air and room air.

  Conventionally, as this type of ventilator, a ventilator that is installed in a building, introduces outside air from an outside air supply port, and supplies the outside through a built-in heat exchange element is known. (For example, refer to Patent Document 1).

  The ventilation air conditioner will be described below with reference to FIG.

  As shown in FIG. 4, the ventilator main body 101 is installed in an attic space or a ceiling space in a building. Fresh outside air is introduced from the outside air inlet 102, passes through the built-in heat exchange element 103, and is supplied to the room through the indoor inlet 104. On the other hand, the dirty air in the room is introduced from the indoor exhaust port 105, passes through the heat exchange element 103, and is exhausted to the outside through the outdoor exhaust port 106. Fresh fresh air introduced from the outdoor air supply port 102 and indoor dirty air introduced from the indoor exhaust port 105 are connected to the electric supply fan 109 connected to the electric motor 107 via the same shaft 108 via the heat exchange element 103. It is configured to be transferred by the exhaust fan 110.

JP-A-11-325535

  Such a conventional heat exchange type ventilator has a problem that condensation of heat exchange elements occurs at low temperatures in winter. In order to prevent the heat exchange element from freezing, intermittent operation may be performed, but there is also a problem that continuous supply / exhaust ventilation cannot be continued.

  Therefore, the present invention solves the above-described conventional problems, and an object of the present invention is to provide a heat exchange type ventilator that can continue supply and exhaust ventilation while suppressing freezing of the heat exchange element.

In order to achieve this object, the present invention provides an air supply fan having an air supply motor, an exhaust fan having an exhaust motor, and the air supply fan for blowing air from the outside to the room. The indoor air and the outdoor air are ventilated at a position where the supply air blowing path, the exhaust fan blowing air from the room to the outside by the exhaust fan, and the supply air blowing path and the exhaust air blowing path intersect. In the heat exchange type ventilator provided with a heat exchange element for exchanging heat when performing, a temperature detecting means is provided on the supply air inlet side of the heat exchange element in the supply air blowing path, and heat exchange is performed in the exhaust ventilation path Humidity detection means is provided on the exhaust inlet side of the element, and the controller controls the operation and rotation speed of the air supply motor and the exhaust motor. The controller detects the temperature detected by the temperature detection means first. 1 Lower the specified temperature In the case of Tsu, wherein as humidity detected is a humidity detecting means becomes a 1A ₁ supply air volume and the 1A ₁ exhaust air volume defined in advance when a first predetermined humidity range, in the humidity detecting means When the detected humidity is in the second predetermined humidity range, the rotation speeds of the air supply motor and the exhaust motor are decreased so that the first A ₂ supply air volume and the first A ₂ exhaust air volume are defined in advance. a shall be continued supply operation and exhaust operation while the maximum value <lowest value, the 1A ₁ supply air volume of the second predetermined humidity range> second 1A ₂ supply air volume of the first predetermined humidity range The _{first A 1} exhaust air volume> the first A ₂ exhaust air volume, thereby achieving the intended purpose.

According to the present invention, an air supply fan provided with an air supply motor, an exhaust fan provided with an exhaust motor, an air supply air passage that is blown indoors from the outside by the air supply fan, For exchanging heat when ventilating indoor air and outdoor air at a position where the exhaust air blowing path blown from the room to the outside by the exhaust fan, and the supply air blowing path and the exhaust air blowing path intersect. In the heat exchange type ventilator including the heat exchange element, a temperature detection means is provided on the supply air inlet side of the heat exchange element in the supply air blowing path, and humidity is detected on the exhaust inlet side of the heat exchange element in the exhaust ventilation path. Means for controlling the operation and rotation speed of the air supply motor and the exhaust motor by the control unit, wherein the control unit is configured such that the temperature detected by the temperature detection unit falls below a first predetermined temperature. The humidity As humidity detected by means out the Product 1A ₁ supply air volume and the 1A ₁ exhaust air volume defined in advance when a first predetermined humidity range, humidity detected by said humidity detecting means second In the predetermined humidity range, the air supply operation and the exhaust are performed while reducing the rotation speeds of the supply motor and the exhaust motor so that the first A ₂ supply air amount and the first A ₂ exhaust air amount are defined in advance. the Rukoto to continue the operation, increase the exchange efficiency, increasing the temperature of the heat exchange element the exhaust side, by lowering the humidity, while preventing the condensation and freezing occurring heat exchange element exhaust outlet, and the air supply The effect that the heat exchange operation of the exhaust can be continued can be obtained.

Schematic diagram showing a heat exchange type ventilator according to Embodiment 1 of the present invention. Block diagram of the control unit The block diagram of the control part of Embodiment 2 of this invention Top view configuration diagram showing a conventional heat exchange ventilator

A heat exchange ventilator according to an aspect of the present invention is blown into a room from the outside by an air supply fan including an air supply motor, an exhaust fan including an exhaust motor, and the air supply fan. The indoor air and the outdoor air are ventilated at a position where the supply air blowing path, the exhaust fan blowing air from the room to the outside by the exhaust fan, and the supply air blowing path and the exhaust air blowing path intersect. In the heat exchange type ventilator provided with a heat exchange element for exchanging heat when performing, a temperature detecting means is provided on the supply air inlet side of the heat exchange element in the supply air blowing path, and heat exchange is performed in the exhaust ventilation path Humidity detection means is provided on the exhaust inlet side of the element, and the controller controls the operation and rotation speed of the air supply motor and the exhaust motor. The controller detects the temperature detected by the temperature detection means first. 1 Below the specified temperature In the case, the as humidity detected is a humidity detecting means becomes a 1A ₁ supply air volume and the 1A ₁ exhaust air volume defined in advance when a first predetermined humidity range, are detected by the humidity detecting means When the humidity is within the second predetermined humidity range, the rotational speeds of the air supply motor and the exhaust motor are decreased so that the first A ₂ supply air volume and the first A ₂ exhaust air volume are defined in advance. The maximum value of the first predetermined humidity range <the minimum value of the second predetermined humidity range, the _{first A 1} supply air volume> the first A ₂ supply air volume, the _{first A 1} exhaust air volume> the first A ₂ exhaust air volume. .

  This improves the exchange efficiency, raises the temperature on the exhaust side of the heat exchange element, and lowers the humidity, thereby preventing the condensation and freezing that occurs at the outlet side of the heat exchange element, and the heat exchange operation between the supply air and the exhaust. The effect of being able to continue is produced.

Further, the control unit decreases the rotation speed of the supply motor and the exhaust motor by detecting that the temperature detected by the temperature detection unit is lower than a first predetermined temperature, and then When it is detected that the temperature detected by the temperature detecting means has fallen below the nth (n is an integer of 2 or more) predetermined temperature, the rotation of the air supply motor is decreased and the rotation of the exhaust motor is rotated. the continued ventilation operation without stopping, but the a first n predetermined temperature <the first predetermined temperature. Thereby, when the heat exchange operation is continued, the ventilation operation can be continued without causing the heat exchange element to freeze below the outside air temperature (nth predetermined temperature) at which the heat exchange element is frozen. There is an effect.

The temperature detection means is an integer greater than or equal to 3, and is detected by the temperature detection means after detecting that the temperature detected by the temperature detection means is below a first predetermined temperature. Before detecting that the temperature has fallen below the nth predetermined temperature, the temperature detected by the temperature detecting means is the kth (k = 2, 3,..., N−1 arbitrary integer) predetermined. When it is detected that the temperature has fallen below, when the humidity detected by the humidity detecting means is within the first predetermined humidity range, the kA ₁ supply air volume and the kA ₁ exhaust air volume are defined in advance. In addition, when the humidity detected by the humidity detecting means is within the second predetermined humidity range, the air supply motor and the air supply air flow are set so that the kA ₂ supply air volume and the kA ₂ exhaust air volume are defined in advance. Maintaining or reducing the rotational speed of the exhaust motor, Temperature <the first k predetermined temperature <the first predetermined temperature, said first kA ₁ supply air volume ≦ claim 1A ₁ supply air flow rate, the first kA ₁ exhaust air volume ≦ claim 1A ₁ exhaust air volume, the kA ₁ supply air volume > KA ₂ supply air volume, kA ₁ exhaust air volume> kA ₂ exhaust air volume. As a result, an appropriate air volume that does not cause condensation or freezing to the exhaust side of the heat exchange element according to the outside air temperature until the outside air temperature (the nth predetermined temperature) is lowered to the operation of exhaust only and the indoor humidity. Therefore, the maximum air volume in each temperature and humidity condition of the heat exchange air operation of the air supply operation and the exhaust operation can be maintained until just before the freezing condensation / generation of the heat exchange element.

Further, n = 3, and the control unit detects that the temperature detected by the temperature detecting unit is lower than a first predetermined temperature, and the temperature detected by the temperature detecting unit is the first level. 3 When it is detected that the temperature detected by the temperature detecting means is lower than the second predetermined temperature before detecting that the temperature is lower than the predetermined temperature, the humidity detected by the humidity detecting means is as the Product 2A ₁ supply air volume and the 2A ₁ exhaust air volume defined in advance when a predetermined humidity range, pre-defined when the humidity detected by said humidity detecting means is the second predetermined humidity range The rotational speeds of the supply motor and the exhaust motor are maintained or decreased so that the _{second A 2} supply air amount and the _{second A 2} exhaust air amount are obtained, and the third predetermined temperature <the second predetermined temperature < The first predetermined temperature, the second A ₁ supply air volume ≦ the _{first A 1} supply air volume, the second A ₁ exhaust air volume ≦ the _{first A 1} exhaust air volume, the second A ₁ supply air volume> the _{second A 2} supply air volume, the second A ₁ exhaust air volume> the _{second A 2} exhaust air volume. Is.

In addition, the control unit is configured to perform a predetermined first when the humidity detected by the humidity detecting unit falls within a third predetermined humidity range when the temperature detected by the temperature detecting unit falls below a first predetermined temperature. The rotational speeds of the air supply motor and the exhaust motor are decreased so that the 1A ₃ supply air amount and the first A ₃ exhaust air amount are obtained, and the maximum value of the second predetermined humidity range <the third predetermined humidity range. minimum value, the 1A ₁ supply air volume> the 1A ₂ supply air volume> the 1A ₃ supply air flow rate is one second 1A ₁ exhaust air volume> the 1A ₂ exhaust air volume> is the 1A ₃ exhaust air volume.

  As a result, an appropriate air volume that does not cause condensation or freezing to the exhaust side of the heat exchange element according to the outside air temperature until the outside air temperature (the nth predetermined temperature) is lowered to the operation of exhaust only and the indoor humidity. Therefore, there is an effect that the air volume of the heat exchange air operation of the air supply operation and the exhaust operation can be maintained until immediately before the freezing condensation / generation of the heat exchange element.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
About the heat exchange type | mold ventilation apparatus of the 1st Embodiment of this invention, an internal structure, an air supply ventilation path, and an exhaust ventilation path | route are demonstrated using FIG. As shown in FIG. 1, a heat exchange ventilator 1 includes an outside air suction port 2 and an indoor air exhaust port 3 on the side surface of a box-shaped main body, and an outside air supply port 4 and room air on the side surface facing this side surface. A suction port 5 is provided. A control unit 11 is provided inside or outside the heat exchange ventilator 1 to control the rotational speeds of the air supply motor of the air supply fan 9 and the exhaust motor of the exhaust fan 10.

  Further, the heat exchange ventilator 1 draws fresh outdoor air (supply air) from the side outside air inlet 2 and passes through the heat exchange element 6 inside the heat exchange type ventilator 1 to the outside air inlet. 4 is provided with a supply air blowing path 7 that is supplied to the room. On the other hand, the contaminated indoor air (exhaust air) is sucked from the indoor air suction port 5, and has an exhaust ventilation path 8 that is exhausted from the indoor air exhaust port 3 to the outside through the heat exchange element 6. At this time, the heat exchange element 6 has a heat recovery function of supplying the amount of heat of exhausted air to the supplied air, or supplying the amount of heat of supplied air to the amount of heat of exhausted air. Have.

  Fresh outdoor air (supply air) introduced from the outside air inlet 2 and contaminated indoor air (exhaust air) introduced from the indoor air inlet 5 are an air supply fan 9 and an exhaust fan 10. In this way, the air flows through the air supply and exhaust passage 7 and the exhaust air passage 8, respectively. The heat exchanging element 6 is disposed at a position where the supply air blowing path 7 and the exhaust ventilation path 8 intersect. An air cleaning filter 12 is disposed on each of the outdoor air suction side and the indoor air suction side of the heat exchange element 6.

  Further, the temperature detection means 13 is disposed on the supply air inlet path of the heat exchange element 6 in the supply air blowing path 7, and the humidity detection means 14 is disposed on the exhaust inlet side of the heat exchange element 6 in the exhaust ventilation path 8.

  In addition, a duct (not shown) can be connected to each of the outside air inlet 2, the indoor air outlet 3, the outside air inlet 4, and the room air inlet. The duct connected to the outside air inlet 2 and the room air outlet 3 is routed to the outer wall surface of the building and communicates with the outdoor air outside the building. The duct connected to the outside air supply port 4 and the indoor air suction port 5 communicates with the ceiling surface or wall surface of the living room and communicates with the room air.

  The control unit 11 controls the rotation speeds of the air supply motor of the air supply fan 9 and the exhaust motor of the exhaust fan 10 to keep the supply air amount and the exhaust air amount constant.

  Here, the characteristic part in the present embodiment, that is, the operation of the control unit 11 will be described.

  When the heat exchange ventilator 1 is activated, the control unit 11 controls the rotation speeds of the air supply motor and the exhaust motor so that the airflow output from the air supply fan 9 and the exhaust fan 10 becomes equal. (Heat exchange air operation)

  However, when the outside air temperature decreases during the heat exchange air operation, condensation occurs from the exhaust air blowing path 8 side of the heat exchange element 6. This is because the indoor air (exhaust air) flowing through the exhaust air flow path 8 is heat-exchanged with the outside air (supply air) in the heat exchange element 6 to lower the temperature below the dew point, that is, saturated steam at the temperature after heat exchange. This is because it retains more water than the amount. The moisture generated by this condensation freezes when the exhaust temperature after heat exchange falls below 0 ° C., causing clogging of the heat exchange element 6 and lowering the ventilation function.

  Furthermore, if the operation is continued as it is, the freezing further proceeds, resulting in a large amount of freezing. The frozen condensed water starts to melt when the outside air temperature rises and overflows from the heat exchange type ventilator 1. The overflowing water has an adverse effect on the installation location and leads to unsafe occurrence such as poor insulation due to water leakage.

  In order to avoid such an event, the control unit 11 is provided on the exhaust gas inlet side of the heat exchange element 6 and the temperature T detected by the temperature detecting means 13 provided on the air supply inlet side of the heat exchange element 6. The humidity H detected by the detected humidity detecting means 14 is monitored, and the supply air amount and the exhaust air amount are decreased in accordance with a predetermined set value, that is, the rotation speed of the supply motor of the supply fan 9 Then, the rotational speed of the exhaust motor of the exhaust fan 10 is decreased.

  This will be described more specifically.

When the outside air temperature T detected by the temperature detecting means 13 is equal to or higher than the first predetermined temperature T ₁ (for example, 5 ° C.), the supply air volume and the exhaust air volume are operated at the predetermined air volume A (for example, 200 m ³ / h each). To do.

Consider a case in which this operating state is continued and the outside air temperature gradually decreases. If the outside temperature decreases, the temperature detecting means 13 detects that below a first predetermined temperature T ₁ of which is set.

When the temperature T detected by the temperature detection means 13 is lower than the first predetermined temperature T _{1 and} is equal to or higher than the second predetermined temperature T ₂ (for example, 0 ° C.) (when T ₂ ≦ T <T ₁ ), the humidity detection means 14 Check the indoor humidity H.

When the humidity H detected by the humidity detecting means 14 is in the first predetermined humidity range (for example, 0% or more and less than 50%), the _{first A 1} supply air volume (for example, 175 m ³ / h) defined in advance and the first A _When the humidity H detected by the humidity detecting means 14 is within a second predetermined humidity range (for example, 50% or more and less than 100%) so as to be ₁ exhaust air volume (for example, 175 m ³ / h), The control unit 11 decreases the rotation speeds of the air supply motor and the exhaust motor so that the 1A ₂ supply air volume (for example, 150 m ³ / h) and the first A ₂ exhaust air volume (for example, 150 m ³ / h) are obtained. .

At this time, the maximum value of the first predetermined humidity range <the minimum value of the second predetermined humidity range, the _{first A 1} supply air volume> the first A ₂ supply air volume, the _{first A 1} exhaust air volume> the first A ₂ exhaust air volume. .

Here, the _{first A 1} supply air volume and the _{first A 1} exhaust air volume are a predetermined indoor temperature when the detected temperature T is T ₂ ≦ T <T ₁ and the detected humidity H is in the first predetermined humidity range. When (for example, JIS B 8628) is assumed, the air volume at which condensation does not occur in the heat exchange element is experimentally obtained and defined. In addition, the first A ₂ supply air volume and the first A ₂ exhaust air volume have a predetermined indoor temperature (when the detected temperature T is T ₂ ≦ T <T ₁ and the detected humidity H is in the second predetermined humidity range). For example, JIS B
8628), the air volume at which condensation does not occur in the heat exchange element is experimentally determined and defined.

  Condensation of the heat exchange element 6 in the exhaust air blowing path 8 is less than the dew point because the indoor air (exhaust air) flowing through the exhaust air blowing path 8 exchanges heat with the outside air (supply air) in the heat exchange element 6. Appears when And the condensed water freezes when the indoor air (exhaust air) which flows through the exhaust ventilation path 8 becomes less than 0 degreeC.

  As described above, when the outside air temperature decreases, condensation and freezing occur in the heat exchange element 6 in the exhaust air blowing path 8. However, in the dew condensation / freezing temperature, the total heat exchange efficiency depends on the air velocity of the supply air flow and the exhaust air flow flowing through the heat exchange element 6, the heat exchange performance of the heat exchange element 6 itself, and the indoor humidity. In other words, if the wind speed is low and the heat exchange performance is high, the exhaust temperature after heat exchange will be high and the saturated water vapor amount will be large, so that more moisture can be retained, and if the indoor humidity is low, the exhaust air As the amount of water retained becomes smaller, the risk of dew condensation is reduced.

  For example, when the air volume of the supply air flow and the exhaust air flow passing through the heat exchange element 6 is extremely small, the total heat exchange efficiency is increased. Therefore, even when the indoor humidity is high, the indoor air (exhaust air) may be deprived of most of the water retained after heat exchange by the outside air (supply air). In this case, only a very small amount of freezing appears even if the element temperature on the exhaust outlet side of the heat exchange element 6 in the exhaust air blowing path 8 becomes 0 ° C. or less. Thus, it can be said that the factors that determine the outside air temperature at which condensation occurs are the wind speed, the exchange efficiency, and the indoor humidity.

  In addition, the control unit 11 decreases the rotation speed of the supply motor and the exhaust motor by detecting that the temperature detected by the temperature detection unit 13 is lower than the first predetermined temperature, When it is detected that the temperature detected by the detection means 13 is below the nth (n is an integer of 2 or more) predetermined temperature, the rotation of the air supply motor is stopped and the rotation of the exhaust motor is stopped. The ventilation operation may be continued only by the exhaust operation without stopping. Here, nth predetermined temperature <first predetermined temperature. As a result, the heat exchange air operation of the air supply operation and the exhaust operation can be continued until immediately before freezing occurs, and the ventilation operation can be continued by switching to the operation of only the exhaust in the extremely low temperature region.

In addition, the control unit 11 may continue the supply / exhaust heat exchange air operation while reducing the supply air amount and the exhaust air amount in a stepwise manner according to the detected temperature and the detected humidity and preventing the occurrence of condensation. That is, the control unit 11 detects that the temperature detected by the temperature detecting unit 13 is lower than the first predetermined temperature, and the temperature detected by the temperature detecting unit 13 is the nth predetermined temperature (n is The temperature detected by the temperature detection means 13 is kth (k = 2, 3,..., N-1), a predetermined temperature before it is detected that the temperature is less than 3). When the humidity detected by the humidity detecting means 14 is in the first predetermined humidity range, the kA ₁ supply air volume and the kA ₁ exhaust air volume are defined in advance. When the humidity detected by the humidity detecting means 14 is in the second predetermined humidity range, the air supply motor and the exhaust air flow are set so that the kA ₂ supply air volume and the kA ₂ exhaust air volume are defined in advance. Maintain or reduce motor speed. Here, the nth predetermined temperature <kth predetermined temperature <first predetermined temperature, kA ₁ supply air volume ≦ first A ₁ supply air volume, kA ₁ exhaust air volume ≦ first A ₁ exhaust air volume, kA ₁ supply air volume> The kA ₂ supply air volume, the kA ₁ exhaust air volume> the kA ₂ exhaust air volume.

  FIG. 2 illustrates the flow of the above control by the control unit 11 when n = 3 (block diagram of the control unit 11). Hereinafter, it demonstrates in order.

When the temperature T detected by the temperature detection means 13 is equal to or higher than a first predetermined temperature T ₁ (for example, 5 ° C.), the supply air volume (SA air volume) and the exhaust air volume (EA air volume) are set to the set air volume A (for example, 200 m ³ each). / H) to continue operation.

When the outside air temperature decreases and the temperature T of the temperature detecting means 13 falls below a first predetermined temperature T ₁ (for example, 5 ° C.), the humidity detecting means 14 detects the indoor humidity H.

When the indoor humidity H is H <H ₁ (for example, H <50%), the supply air amount and the exhaust air amount are the _{first A 1} supply air amount and the _{first A 1} exhaust air amount (for example, 175 m ³ / h, respectively). Reduce the number of revolutions of the motor and exhaust motor. When the indoor humidity H is H ₁ ≦ H <H ₂ (for example, 50% ≦ H <100%), the supply air amount and the exhaust air amount are the first A ₂ supply air amount and the first A ₂ exhaust air amount (for example, 150 m ³ / h, respectively). ) To reduce the rotation speed of the air supply motor and the exhaust motor.

  The higher the room humidity, the greater the moisture contained in the exhaust air, increasing the risk of condensation and freezing. For this reason, in order to reduce the risk of condensation and freezing, the temperature of the exhaust air is increased and the humidity of the exhaust air is lowered by increasing the replacement efficiency by increasing the wind speed. As the temperature of the exhaust air increases, the dew point temperature increases and the amount of water that can be retained increases. Further, if the humidity of the exhaust air decreases, there is a margin for the amount of moisture that the exhaust air can hold.

  These actions can reduce the risk of condensation and freezing of exhaust air.

Incidentally, below the temperature T is the first predetermined temperature T ₁ of the temperature detecting means 13, the 1A ₁ supply air volume, the 1A ₁ exhaust air volume operation air volume, one of the first 1A ₂ supply air volume, the 1A ₂ exhaust air volume When the detected temperature T becomes a value exceeding the predetermined value T ₁ + α after the operation is continued, the supply air flow rate and the exhaust air flow rate are set to A (for example, 200 m ³ / h each) as the initial air flow rate. Return each one. Here, α is a predetermined value (for example, 3) for providing hysteresis.

The same control is performed when the outside air temperature further decreases. When the temperature T of the temperature detection means 13 falls below a second predetermined temperature T ₂ (for example, 0 ° C.), the humidity detection means 14 detects the indoor humidity H.

When the indoor humidity H is H <H ₁ (for example, H <50%), the supply air amount and the exhaust air amount are the second A ₁ supply air amount and the second A ₁ exhaust air amount (for example, 150 m ³ / h, respectively). Maintain or reduce motor and exhaust motor speed. When the indoor humidity H is H ₁ ≦ H <H ₂ (for example, 50% ≦ H <100%), the supply air volume and the exhaust air volume are the _{second A 2} supply air volume and the _{second A 2} exhaust air volume (for example, 125 m ³ / h, respectively). ) To maintain or reduce the rotation speed of the air supply motor and the exhaust motor.

The temperature T of the temperature detecting means 13 is lower than the second predetermined temperature T ₂ , and the operating air volume is any of the second A ₁ supply air volume, the _{second A 1} exhaust air volume, the _{second A 2} supply air volume, and the _{second A 2} exhaust air volume. When the detected temperature T becomes a value exceeding the predetermined value T ₂ + α after the operation is continued, the _{first A 1} supply air volume / Return to the 1A ₁ exhaust air volume (for example, 175 m ³ / h each) or the first A ₂ supply air volume / the first A ₂ exhaust air volume (for example, 150 m ³ / h each).

When the outside air temperature further decreases and the temperature T of the temperature detecting means 13 falls below a third predetermined temperature T ₃ (for example, −5 ° C.), the humidity detecting means 14 detects the indoor humidity H.

When the indoor humidity H is H <H ₁ (for example, H <50%), the rotational speed of the exhaust motor is maintained or decreased so that the exhaust air volume becomes the ^{third A} ₁ exhaust air volume (for example, 125 m ³ / h). Indoor humidity H
When H ₁ ≦ H <H ₂ (for example, 50% ≦ H <100%), the rotational speed of the exhaust motor is maintained or reduced so that the exhaust air volume becomes the ^{third A} ₂ exhaust air volume (for example, 100 m ³ / h). At these times, only the exhaust is operated, and the air supply motor is stopped.

If the temperature T of the temperature detecting means 13 decreases to a temperature lower than the third predetermined temperature T ₃ , the risk of freezing becomes very high because the exhaust temperature becomes 0 ° C. or less even with a small air volume. Conventionally, the ventilation operation is stopped in such a low temperature range, but the control unit 11 stops only the air supply fan to operate only the exhaust, thereby preventing the introduction of outside air and preventing the heat exchange element 6 from freezing. Meanwhile, the ventilation operation can be continued.

  Further, since only the exhaust operation is performed, the temperature detection means 13 cannot detect the outside air temperature, so that the air supply fan is also operated periodically (after t time in FIG. 2) to return to the heat exchange air operation, so that the outside air Control to an operating state appropriate to the temperature.

In this way, up to the n-th predetermined temperature T _n (for example, n = 3) that must be exhausted only is defined arbitrarily, and the indoor humidity (H <H ₁ , H 2) at each predetermined temperature T _k (for example, k = 2). By defining the set air volume (kA ₁ supply air volume, kA ₁ exhaust air volume, kA ₂ supply air volume, kA ₂ exhaust air volume) for each ₁ ≦ H <H ₂ ), the room humidity and the outdoor temperature Heat exchange air operation can be performed while maintaining the air volume that does not condense or freeze under the conditions of

  In FIG. 2, n = 3 does not mean that there are only three steps for detecting temperature or humidity, but means that there are at least three steps. More appropriate ventilation operation is possible by arbitrarily defining the steps and finely controlling the air volume.

In this embodiment, the third predetermined temperature <the second predetermined temperature <the first predetermined temperature, the third A ₁ supply air volume ≦ the second A ₁ supply air volume ≦ the _{first A 1} supply air volume, and the third A ₁ exhaust air volume ≦ the first predetermined temperature. filled 2A ₁ exhaust air volume ≦ first 1A ₁ exhaust air volume, the 2A ₁ supply air volume> the 2A ₂ supply air flow rate, the 2A ₁ exhaust air volume> the 2A ₂ exhaust air volume, the first 3A ₁ exhaust air volume> the 3A ₂ exhaust air volume ing.

(Embodiment 2)
FIG. 3 illustrates a flow of control by the control unit 11 regarding the heat exchange type ventilator according to the second embodiment of the present invention (block diagram of the control unit 11).

The main difference between FIG. 3 and FIG. 2 is that in FIG. 2, there are two predetermined humidity ranges, a first predetermined humidity range (H <H ₁ ) and a second predetermined humidity range (H ₁ ≦ H <H ₂ ). On the other hand, in FIG. 3, the predetermined humidity ranges are the first predetermined humidity range (H <H ₁ ), the second predetermined humidity range (H ₁ ≦ H <H ₂ ), and the third predetermined humidity range (H ₂ ≦ There are three points H <H ₃ ). Note that the maximum value in the second predetermined humidity range <the minimum value in the third predetermined humidity range.

  Hereinafter, it demonstrates in order.

When the temperature T detected by the temperature detection means 13 is equal to or higher than a first predetermined temperature T ₁ (for example, 5 ° C.), the supply air volume (SA air volume) and the exhaust air volume (EA air volume) are set to the set air volume A (for example, 200 m ³ each). / H) to continue operation.

When the outside air temperature decreases and the temperature T of the temperature detecting means 13 falls below a first predetermined temperature T ₁ (for example, 5 ° C.), the humidity detecting means 14 detects the indoor humidity H.

When the indoor humidity H is H <H ₁ (for example, H <30%), the supply air amount and the exhaust air amount are the _{first A 1} supply air amount and the _{first A 1} exhaust air amount (for example, 175 m ³ / h, respectively). Reduce the number of revolutions of the motor and exhaust motor. When the indoor humidity H is H ₁ ≦ H <H ₂ (for example, 30% ≦ H <50%), the supply air volume and the exhaust air volume are the first A ₂ supply air volume and the first A ₂ exhaust air volume (for example, 150 m ³ / h, respectively). ) To reduce the rotation speed of the air supply motor and the exhaust motor. When the indoor humidity H is H ₂ ≦ H <H ₃ (for example, 50% ≦ H <100%), the supply air amount and the exhaust air amount are the first A ₃ supply air amount and the first A ₃ exhaust air amount (for example, 125 m ³ / h) The rotational speeds of the air supply motor and the exhaust motor are reduced so as to satisfy h).

  The higher the room humidity, the greater the moisture contained in the exhaust air, increasing the risk of condensation and freezing. For this reason, in order to reduce the risk of condensation and freezing, the temperature of the exhaust air is increased and the humidity of the exhaust air is lowered by increasing the replacement efficiency by increasing the wind speed. As the temperature of the exhaust air increases, the dew point temperature increases and the amount of water that can be retained increases. Further, if the humidity of the exhaust air decreases, there is a margin for the amount of moisture that the exhaust air can hold.

  These actions can reduce the risk of condensation and freezing of exhaust air.

In addition, since the third predetermined humidity range (H ₂ ≦ H <H ₃ ) is added, the heat exchange air operation can be continued more effectively in a state in which condensation and freezing hardly occur.

Incidentally, below the temperature T is the first predetermined temperature T ₁ of the temperature detection means 13, the operating air volume first 1A ₁ supply air volume, the 1A ₁ exhaust air volume, the 1A ₂ supply air volume, the 1A ₂ exhaust air volume, the 1A _If the detected temperature T exceeds the specified value T ₁ + α after continuing operation with either the ₃ supply air volume or the first A ₃ exhaust air volume, the initial settings are made for the supply air volume and the exhaust air volume. The air flow is returned to A (for example, 200 m ³ / h, respectively). Here, α is a predetermined value (for example, 3) for providing hysteresis.

The same control is performed when the outside air temperature further decreases. When the temperature T of the temperature detection means 13 falls below a second predetermined temperature T ₂ (for example, 0 ° C.), the humidity detection means 14 detects the indoor humidity H.

When the indoor humidity H is H <H ₁ (for example, H <30%), the supply air amount and the exhaust air amount are the second A ₁ supply air amount and the second A ₁ exhaust air amount (for example, 150 m ³ / h, respectively). Maintain or reduce motor and exhaust motor speed. When the indoor humidity H is H ₁ ≦ H <H ₂ (for example, 30% ≦ H <50%), the supply air amount and the exhaust air amount are the _{second A 2} supply air amount and the _{second A 2} exhaust air amount (for example, 125 m ³ / h, respectively). ) To maintain or reduce the rotation speed of the air supply motor and the exhaust motor. When the indoor humidity H is H ₂ ≦ H <H ₃ (for example, 50% ≦ H <100%), the supply air amount and the exhaust air amount are the second A ₃ supply air amount and the second A ₃ exhaust air amount (for example, 100 m ³ / h) Maintain or reduce the rotational speeds of the air supply motor and the exhaust motor so that

Note that the temperature T of the temperature detecting means 13 is lower than the second predetermined temperature T ₂ , and the operating air volume is the second A ₁ supply air volume / the second A ₁ exhaust air volume, the _{second A 2} supply air volume / the _{second A 2} exhaust air volume, the second A _When the detected temperature T exceeds the predetermined value T ₂ + α after continuing operation with either the ₃ supply air volume or the second A ₃ exhaust air volume, one step is taken between the supply air volume and the exhaust air volume. The _{first A 1} supply air volume / first A ₁ exhaust air volume (for example, 175 m ³ / h, respectively) or the first A ₂ supply air volume / first A ₂ exhaust air volume (for example, 150 m ³ / h, respectively) or the first A ₃ Return to the supply air volume / first A ₃ exhaust air volume (for example, 125 m ³ / h, respectively).

When the outside air temperature further decreases and the temperature T of the temperature detecting means 13 falls below a third predetermined temperature T ₃ (for example, −5 ° C.), the humidity detecting means 14 detects the indoor humidity H.

When the indoor humidity H is H <H ₁ (for example, H <30%), the rotational speed of the exhaust motor is maintained or reduced so that the exhaust air volume becomes the ^{third A} ₁ exhaust air volume (for example, 125 m ³ / h). When the indoor humidity H is H ₁ ≦ H <H ₂ (for example, 30% ≦ H <50%), the rotational speed of the exhaust motor is maintained so that the exhaust air volume becomes the ^{third A} ₂ exhaust air volume (for example, 100 m ³ / h) or Decrease. When the indoor humidity H is H ₂ ≦ H <H ₃ (for example, 50% ≦ H <100%), the rotational speed of the exhaust motor is set so that the exhaust air volume becomes the _{third A 3} exhaust air volume (for example, 75 m ³ / h). Maintain or decrease. At these times, only the exhaust is operated, and the air supply motor is stopped.

If the temperature T of the temperature detecting means 13 decreases to a temperature lower than the third predetermined temperature T ₃ , the risk of freezing becomes very high because the exhaust temperature becomes 0 ° C. or less even with a small air volume. Conventionally, the ventilation operation is stopped in such a low temperature range, but the control unit 11 stops only the air supply fan and performs only the exhaust operation, thereby preventing the introduction of outside air and preventing the heat exchange element from freezing. However, the ventilation operation can be continued.

  Further, since only the exhaust operation is performed, the temperature detection unit 13 cannot detect the outside air temperature, so that the air supply fan is also operated periodically (after t time in FIG. 3) to return to the heat exchange air operation. Control to an operating state appropriate to the temperature.

In this way, up to the n-th predetermined temperature T _n (for example, n = 3) that must be exhausted only is defined arbitrarily, and the indoor humidity (H <H ₁ , H 2) at each predetermined temperature T _k (for example, k = 2). _{For each of 1} ≦ H <H ₂ and H ₂ ≦ H <H ₃ , the set air volume (kA ₁ supply air volume, kA ₁ exhaust air volume, kA ₂ supply air volume, kA ₂ exhaust air volume, kA ₃ supply air flow rate, by defining the first kA ₃ exhaust air volume), while maintaining the air volume no condensation-frozen under conditions of room humidity and outdoor temperature, it is possible to perform the heat exchange of gas operation.

  In FIG. 3, n = 3 does not mean that there are only three steps for detecting temperature or humidity, but means that there are at least three steps. More appropriate ventilation operation is possible by arbitrarily defining the steps and finely controlling the air volume.

In this embodiment, the third predetermined temperature <the second predetermined temperature <the first predetermined temperature, the third A ₁ supply air volume ≦ the second A ₁ supply air volume ≦ the _{first A 1} supply air volume, and the third A ₁ exhaust air volume ≦ the first predetermined temperature. 2A ₁ exhaust air volume ≦ 1A ₁ exhaust air volume, 1A ₁ air supply air volume> 1A ₂ air supply air volume> 1A ₃ air supply air volume, 1A ₁ exhaust air volume> 1A ₂ exhaust air volume> 1A ₃ exhaust air volume, the 2A ₁ supply air volume> the 2A ₂ supply air volume> the 2A ₃ supply air flow rate, the 2A ₁ exhaust air volume> the 2A ₂ exhaust air volume> the 2A ₃ exhaust air volume, the 3A ₁ exhaust air volume> the 3A ₂ exhaust air volume > 3A ₃ Exhaust air volume is satisfied.

  The heat exchange type ventilator is effective for applications such as a duct type ventilator and a duct type air conditioner for the purpose of exchanging heat between outside air and room air.

DESCRIPTION OF SYMBOLS 1 Heat exchange type ventilator 2 Outside air suction port 3 Indoor air exhaust port 4 Outside air supply port 5 Indoor air suction port 6 Heat exchange element 7 Supply air ventilation path 8 Exhaust air supply path 9 Supply air fan 10 Exhaust fan 11 Control part 12 Air cleaning filter 13 Temperature detection means 14 Humidity detection means

Claims (6)

An air supply fan equipped with an air supply motor;
An exhaust fan with an exhaust motor;
An air supply air passage that is blown indoors from the outside by the air supply fan;
An exhaust air blowing path for blowing air from the room to the outside by the exhaust fan;
In a heat exchange type ventilator provided with a heat exchange element for exchanging heat when ventilating indoor air and outdoor air at a position where the supply air blowing path and the exhaust air blowing path intersect,
A temperature detection means is provided on the supply air inlet side of the heat exchange element in the supply air blowing path,
Humidity detection means is provided on the exhaust inlet side of the heat exchange element in the exhaust air blowing path,
The controller controls the operation and rotation speed of the air supply motor and the exhaust motor,
When the temperature detected by the temperature detection means falls below a first predetermined temperature and the humidity detected by the humidity detection means is within a first predetermined humidity range, When the humidity detected by the humidity detecting means is in the second predetermined humidity range so that the ₁ intake air volume and the 1A ₁ exhaust air volume become the first 1 A ₂ supply air volume and the 1 A ₂ exhaust air volume So that the air supply operation and the exhaust operation are continued while reducing the rotation speed of the air supply motor and the exhaust motor,
The maximum value of the first predetermined humidity range <the minimum value of the second predetermined humidity range, the _{first A 1} supply air volume> the first A ₂ supply air volume, the _{first A 1} exhaust air volume> the first A ₂ exhaust air volume. Heat exchange type ventilator. The controller detects the temperature after the number of rotations of the supply motor and the exhaust motor is decreased by detecting that the temperature detected by the temperature detection means is lower than a first predetermined temperature. When it is detected that the temperature detected by the means is lower than the nth (n is an integer of 2 or more) predetermined temperature, the rotation of the supply motor is decreased and the rotation of the exhaust motor is stopped. to continue the ventilation operation without,
The heat exchange type ventilator according to claim 1, wherein the nth predetermined temperature <the first predetermined temperature. An air supply fan equipped with an air supply motor;
An exhaust fan with an exhaust motor;
An air supply air passage that is blown indoors from the outside by the air supply fan;
An exhaust air blowing path for blowing air from the room to the outside by the exhaust fan;
In a heat exchange type ventilator provided with a heat exchange element for exchanging heat when ventilating indoor air and outdoor air at a position where the supply air blowing path and the exhaust air blowing path intersect,
A temperature detection means is provided on the supply air inlet side of the heat exchange element in the supply air blowing path,
Humidity detection means is provided on the exhaust inlet side of the heat exchange element in the exhaust air blowing path,
The controller controls the operation and rotation speed of the air supply motor and the exhaust motor,
When the temperature detected by the temperature detection means falls below a first predetermined temperature and the humidity detected by the humidity detection means is within a first predetermined humidity range, ₁ Supply air volume and 1A ₁ When the humidity detected by the humidity detecting means is in the second predetermined humidity range so as to be the exhaust air volume, the first 1A defined in advance is used. ₂ Supply air volume and 1A ₂ Decrease the rotation speed of the air supply motor and the exhaust motor so that the exhaust air volume becomes
The maximum value of the first predetermined humidity range <the minimum value of the second predetermined humidity range, 1A ₁ Supply air volume> 1A ₂ Supply air volume, 1A ₁ Exhaust air volume> 1A ₂ Exhaust air volume,
The controller detects the temperature after the number of rotations of the supply motor and the exhaust motor is decreased by detecting that the temperature detected by the temperature detection means is lower than a first predetermined temperature. When it is detected that the temperature detected by the means has fallen below the nth (n is an integer equal to or greater than 2) predetermined temperature, the rotation of the supply motor is stopped and the rotation of the exhaust motor is stopped. Without exhausting, and continuing ventilation only
The heat exchange type ventilator, wherein the nth predetermined temperature <the first predetermined temperature. n is an integer greater than or equal to 3,
The control unit detects that the temperature detected by the temperature detecting means is lower than a first predetermined temperature and that the temperature detected by the temperature detecting means is lower than an nth predetermined temperature. Before detecting, when it is detected that the temperature detected by the temperature detecting means is lower than the kth (k = 2, 3,..., N-1 any integer) predetermined temperature, When the humidity detected by the humidity detecting means is within the first predetermined humidity range, the humidity detected by the humidity detecting means so that the kA ₁ supply air volume and the kA ₁ exhaust air volume are defined in advance. When the air pressure is in the second predetermined humidity range, the rotational speeds of the air supply motor and the exhaust motor are maintained or decreased so that the kA ₂ supply air volume and the kA ₂ exhaust air volume are defined in advance. ,
Nth predetermined temperature <kth predetermined temperature <first predetermined temperature, kA ₁ supply air volume ≦ _{first A 1} supply air volume, kA ₁ exhaust air volume ≦ _{first A 1} exhaust air volume, kA ₁ supply air volume> the kA ₂ supply air flow rate, heat exchanger type ventilation system according to claim 2 or 3, wherein the first kA ₁ exhaust air volume> a first kA ₂ exhaust air volume. n = 3,
The control unit detects that the temperature detected by the temperature detecting means is lower than a first predetermined temperature and that the temperature detected by the temperature detecting means is lower than a third predetermined temperature. Before detecting, when it is detected that the temperature detected by the temperature detecting means is lower than the second predetermined temperature, the humidity detected by the humidity detecting means is in the first predetermined humidity range in advance. When the humidity detected by the humidity detecting means is within the second predetermined humidity range so that the defined second A ₁ supply air volume and the second A ₁ exhaust air volume are obtained, the predefined _{second A 2} supply air volume is obtained. And maintaining or reducing the rotation speed of the air supply motor and the exhaust motor so that the _{second A 2} exhaust air volume is obtained,
The third predetermined temperature <the second predetermined temperature <the first predetermined temperature, the second A ₁ supply air volume ≦ the _{first A 1} supply air volume, the second A ₁ exhaust air volume ≦ the _{first A 1} exhaust air volume, and the second A 5. The heat exchange type ventilator according to claim 4 , wherein ₁ supply air volume> second A ₂ supply air volume, 2A ₁ exhaust air volume> second A ₂ exhaust air volume. When the temperature detected by the temperature detecting means falls below a first predetermined temperature and the humidity detected by the humidity detecting means is within a third predetermined humidity range, Reduce the rotation speed of the air supply motor and the exhaust motor so that ₃ air supply air volume and 1A ₃ exhaust air flow volume.
Maximum <minimum value of the third predetermined humidity range, the 1A ₁ supply air volume> the second predetermined humidity range first 1A ₂ supply air volume> the 1A ₃ supply air flow rate, the 1A ₁ exhaust air volume> the 1A ₂ The heat exchange ventilator according to any one of claims 1 to _{3, wherein the} exhaust air volume is greater than the first A3 exhaust air volume.

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