JP2013185714A - Heat exchange ventilator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve continuity of ventilation and energy saving of a ventilator without carrying out unnecessary defrost operation in a heat exchange ventilator used in a building such as a house, an office, or the like.SOLUTION: A heat exchange ventilator 1 includes an air supply fan 2, an air exhaust fan 6, a heat exchange element 10, an ambient air temperature sensor 11, and a microcomputer 13. In the heat exchanger ventilator, the microcomputer 13 calculates a natural ventilation amount based on an ambient air temperature detected by the ambient air temperature sensor 11, and controls the rotation speed of the air supply fan 2 and the air exhaust fan 6 to have an air ventilation amount that is an amount obtained by subtracting the natural ventilation amount from the necessary ventilation amount. The ventilator is provided with an exhaust air flow amount sensor 12. The microcomputer 13 is configured to carry out an operation for defrost when an exhaust air flow amount detected by the exhaust air flow amount sensor 12 does not satisfy the ventilation amount that is an amount obtained by subtracting the natural ventilation amount from the necessary ventilation amount, thus improving continuity of ventilation and the energy saving of the ventilator without performing an unnecessary defrost operation.

Description

  The present invention relates to a heat exchange type ventilation device used in a building such as a house or an office.

  In recent years, with the global warming, the energy saving in the residential field has become important. Since energy consumed in hot water supply, lighting, and air conditioning is relatively large among the energy consumed in a house, a technology for reducing these consumed energy is highly desired.

  Focusing on the air conditioning load of the house, there is heat that escapes from the housing of the house (cooling in the case of cooling) and heat that escapes due to ventilation. The heat escaping from the housing of housing has been significantly reduced due to the significant improvement in heat insulation and airtightness of the housing in recent decades. On the other hand, in order to reduce the heat escaped by ventilation, a heat exchange type ventilation device that exchanges heat between supply air and exhaust is effective.

  The need for air-conditioning energy reduction is particularly great in cold regions, but heat exchange ventilators have a problem that the air path of the element is clogged because frost develops inside the heat exchange element when the outside air is cold. This is because the warm air in the room is cooled by the cold outside air to a low temperature, and the water vapor is saturated. The frost is most easily formed on the exhaust air passage EA side inside the element.

  In order to remove frost adhering to the heat exchange element in this way, when frost is formed, indoor air is circulated inside the equipment, only exhaust is performed, or outside air is warmed with a heater and then introduced. The frost function is usually installed in heat exchange type ventilation equipment for cold regions. However, such a defrosting function reduces the continuity of ventilation and the energy saving performance of the equipment, so it is better not to perform it unless it is really necessary.

  By the way, since the outside air is cold in cold regions in winter, the temperature difference between indoor and outdoor is very large. Heat exchange type ventilation equipment is a type 1 ventilation that supplies and exhausts air at the same time, so the differential pressure generated by the equipment is relatively small, and as a result, a considerable amount of natural ventilation is generated due to the difference in indoor and outdoor temperatures. Will do. If the ventilation rate of the heat exchange type ventilation equipment is constant throughout the year, natural ventilation will be added if the temperature difference between the indoor and outdoor is large, resulting in over-ventilation.

  As described above, considering the fact that frost formation occurs when the outside air is at a low temperature and that the air is over-ventilated by natural ventilation, there is a possibility that the energy saving performance of the heat exchange type ventilator can be improved. In other words, even if the heat exchange element is clogged with some frost, if the ventilation volume reduced by the amount of over-ventilation is secured by natural ventilation, there is no extra heat loss due to over-ventilation and defrosting operation It is not necessary to do.

  As a conventional heat exchange type ventilator, one having a reduced amount of ventilation that is excessively ventilated by natural ventilation is known (for example, see Patent Document 1).

  Hereinafter, the heat exchange type ventilator will be described with reference to FIG. FIG. 4 is a configuration diagram showing the configuration of a conventional heat exchange type ventilation device 101.

  As shown in FIG. 4, the heat exchange type ventilation device 101 includes an air supply fan 102, an exhaust fan 103, a motor 104 (not shown) that moves them, an air supply inlet 105, and an air supply outlet 106. The exhaust air inlet 107, the exhaust outlet 108, and the heat exchange element 109 are provided to exchange heat and moisture between the exhaust air and the supply air. The heat exchange type ventilator 101 also includes an outdoor temperature sensor 110 that detects the outdoor temperature, an indoor temperature sensor 111 that detects the indoor temperature, and a controller 112 (not shown) that controls the motor 104 in response to the detected temperature. The controller 112 stores in advance data indicating the relationship between the indoor / outdoor temperature difference, the airtight performance value, and the natural ventilation amount, and the natural ventilation is determined from the indoor / outdoor temperature difference, the input airtight performance value, and the above data. The amount is calculated, and the motor 104 is controlled so that the ventilation amount of the heat exchange type ventilation device 101 becomes the ventilation amount obtained by subtracting the natural ventilation amount from the necessary ventilation amount.

JP 2011-7354 A

  In such a conventional heat exchange type ventilator, no particular reference is made to the defrosting operation when frosting occurs. For example, as a general defrosting operation, a method of measuring the temperature and humidity inside the EA air passage and performing a defrosting operation when the temperature becomes near freezing point or the relative humidity becomes near 100% can be considered. However, this method is to perform defrosting operation when the inside of the element gets frosted, and even if the ventilation volume reduced by the amount of over-ventilation due to natural ventilation can be secured, it will be defrosted regardless of that. It had a problem that the continuity of ventilation and the energy-saving performance of the equipment were reduced due to operation.

  Therefore, the present invention solves the above-described conventional problems, and only when the heat exchange element is frosted and the ventilation amount reduced by the amount of excessive ventilation due to natural ventilation cannot be secured, the defrosting mode is set. Therefore, it aims at providing the heat exchange type | formula ventilation apparatus which improves the continuity of ventilation and the energy-saving property of an apparatus, without performing unnecessary defrost operation.

  In order to achieve this object, the present invention provides an air supply means for supplying air from the outside to the room, an exhaust means for exhausting air from the room to the outside, and heat between the supply air and the exhaust air. A heat exchanging element for exchanging; an outside air temperature detecting means for detecting the temperature of the outside air; and a control means for receiving the detection result of the outside air temperature detecting means to control the air supply means and the exhaust means. The means calculates the natural ventilation based on the difference between the outside air temperature detected by the outside air temperature detecting means and the room temperature, and the air supply means and the air pressure so as to obtain a ventilation volume obtained by subtracting the natural ventilation volume from the necessary ventilation volume. The heat exchange type ventilation device for controlling the exhaust means includes an exhaust air volume detection means for detecting the exhaust air volume, and the control means receives the detection result of the exhaust air volume detection means, and the exhaust air volume is changed from the necessary ventilation volume to the natural ventilation volume. The ventilation volume is reduced. A heat exchange ventilator that performs operation for defrosting the absence, thereby is to achieve the intended purpose.

  According to the present invention, the air supply means for supplying air from the outdoor to the room, the exhaust means for exhausting from the indoor to the outdoor, and the heat exchange element for exchanging heat between the supply air and the exhaust air An outside air temperature detecting means for detecting the temperature of the outside air, and a control means for receiving the detection result of the outside air temperature detecting means to control the air supply means and the exhaust means, wherein the control means is the outside air temperature detecting means. Heat exchange that calculates the natural ventilation based on the difference between the outside air temperature detected by the air and the room temperature and controls the air supply means and the exhaust means so as to obtain a ventilation quantity obtained by subtracting the natural ventilation quantity from the necessary ventilation quantity The ventilator has an exhaust air volume detection means for detecting the exhaust air volume, and the control means receives the detection result of the exhaust air volume detection means, and the exhaust air volume satisfies the ventilation volume obtained by subtracting the natural ventilation volume from the necessary ventilation volume. Movement for defrosting when not Since the defrost mode is entered only when the heat exchange element is frosted and the ventilation volume reduced by the amount of excessive ventilation due to natural ventilation cannot be secured, The effect of improving the continuity of ventilation and the energy saving performance of the equipment without performing the frost operation can be obtained.

The block diagram which shows the structure of the heat exchange type | mold ventilation apparatus of Embodiment 1 of this invention Flow diagram showing the operation method of the heat exchange type ventilation equipment Graph showing the relationship between indoor / outdoor temperature difference and number of ventilations due to natural ventilation The block diagram which shows the structure of the conventional heat exchange type ventilation equipment

  The heat exchange type ventilator according to claim 1 of the present invention includes an air supply means for supplying air from the outside to the room, an exhaust means for exhausting air from the room to the outside, and between the supply air and the exhaust air. A heat exchange element for exchanging heat; an outside air temperature detecting means for detecting the temperature of the outside air; and a control means for controlling the air supply means and the exhaust means in response to a detection result of the outside air temperature detecting means, The control means calculates the natural ventilation based on the difference between the outside air temperature detected by the outside air temperature detecting means and the room temperature, and the air supply means so as to obtain a ventilation volume obtained by subtracting the natural ventilation volume from the necessary ventilation volume. And the heat exchange type ventilator for controlling the exhaust means, the exhaust means is provided with an exhaust air volume detection means for detecting the exhaust air volume, and the control means receives the detection result of the exhaust air volume detection means, so that the exhaust air volume is The ventilation volume is reduced by reducing the ventilation volume. It has a configuration that performs an operation for defrosting the absence. As a result, the defrosting mode is entered only when the heat exchange element is frosted and the ventilation volume reduced by the amount of excessive ventilation due to natural ventilation cannot be secured. It has the effect of improving the continuity of ventilation and the energy saving performance of the equipment.

  Further, the room temperature may be set to a preset temperature. This eliminates the need for an indoor temperature detecting means for detecting the indoor temperature, and thus has the effect of reducing costs.

  Moreover, immediately after performing the operation for defrosting, the control means notifies an abnormality when the exhaust air volume detected by the exhaust air volume detecting means is less than the ventilation volume obtained by subtracting the natural ventilation volume from the necessary ventilation volume. It may be configured as follows. Thereby, even if it is a situation where frost is attached to the heat exchange element, there is an effect that it is possible to notify the user of an abnormality when the ventilation amount is reduced due to a cause other than frost.

  Further, the control means is configured such that the outside air temperature detected by the outside air temperature detecting means is equal to or higher than a certain value, and the exhaust air volume detected by the exhaust air volume detecting means satisfies a ventilation volume obtained by subtracting a natural ventilation volume from a necessary ventilation volume. If there is not, it may be configured to notify the abnormality. As a result, when the outside air temperature is clearly not frosted in summer or in the middle, the ventilation rate is reduced due to a cause other than frost, and the user is not required to perform an abnormal defrosting operation. Since it can be informed, the effect is high efficiency and energy saving.

  Further, the ventilation may be stopped when the natural ventilation calculated by the control means is greater than the necessary ventilation. Thereby, there is an effect that energy is saved without consuming unnecessary power.

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

(Embodiment 1)
A heat exchange type ventilation apparatus 1 according to Embodiment 1 of the present invention will be described with reference to FIG. FIG. 1 is a configuration diagram showing the configuration of the heat exchange type ventilation device 1 of the first embodiment.

  The heat exchange type ventilator 1 includes an air supply fan 2 as an air supply means, an air supply intake port 3, an air supply outlet 4, and a motor 5 (not shown) for moving the air supply fan 2, and also serves as an exhaust means. An exhaust fan 6, an exhaust suction port 7, an exhaust outlet 8, and a motor 9 (not shown) that moves the exhaust fan 6 are provided. The air supply fan 2 and the exhaust fan 6 are of a high static pressure type such as a sirocco fan so that air can be reliably supplied or exhausted even if there is a pressure difference between the room and the outside. The motors 5 and 9 are DC motors whose rotation speed can be continuously changed. The motor 5 and the motor 9 may be the same, and the air supply fan 2 and the exhaust fan 6 may be moved simultaneously by one motor.

  The heat exchange type ventilation device 1 includes a heat exchange element 10 for exchanging heat between the supply air and the exhaust air. The heat exchange element 10 is a total heat type, but may be a sensible heat type. In cold districts, sensible heat exchange elements are usually used. However, as long as there is no risk of deterioration or damage due to freezing, using a total heat exchange element such as paper or resin film will increase the total heat exchange efficiency. can do. Further, since the total heat exchange element can also exchange latent heat (humidity), it has a feature that frost is hardly formed even when the outside air temperature is lowered.

  Further, the heat exchange type ventilation device 1 includes an outside air temperature sensor 11 as an outside air temperature detecting means in the vicinity of the supply air inlet 3 in the supply air passage. The outside air temperature sensor 11 can measure with relatively high accuracy even when the outside air becomes low temperature, for example, a K-type thermocouple.

  Further, the heat exchange type ventilation device 1 includes an exhaust air flow sensor 12 as an exhaust air flow detecting means in the exhaust air passage. If the exhaust air volume sensor 12 is installed on the downstream (outdoor) side of the heat exchange element of the exhaust air path, there is a possibility of condensation, so it is better to install it on the upstream (indoor) side of the heat exchange element. The exhaust air volume sensor 12 is an electric type, for example, a hot-wire anemometer.

  Moreover, the heat exchange type | mold ventilation apparatus 1 is provided with the microcomputer (henceforth, microcomputer) 13 as a control means. The microcomputer 13 is connected to the outside air temperature sensor 11 and the exhaust air volume sensor 12 so as to receive the detected values. Here, since the anemometer is used as the exhaust air volume sensor 12, the microcomputer 13 stores the relationship between the wind speed and the air volume in advance.

  The microcomputer 13 is connected to the motor 5 and the motor 9 so that the number of rotations thereof can be controlled. The microcomputer 13 has a memory function for storing information and a timer function for measuring time.

  Further, the heat exchange type ventilation device 1 includes a switch 14 (not shown) so that the user can input start and stop of operation, a desired operation mode, and the like. The switch 14 is connected to the microcomputer 13 by wire or wirelessly and transmits information input by the user to the microcomputer 13.

  The heat exchanging ventilator 1 includes an OA filter 15 and an RA filter 16 to prevent dust and insects from accumulating inside the heat exchanging ventilator 1, particularly the heat exchanging element 10.

  Hereinafter, the operation method of the heat exchange type ventilation apparatus 1 will be described with reference to FIG. FIG. 2 is a flowchart showing the operation method of the heat exchange type ventilation device 1.

  First, S1 in FIG. 2 will be described. S <b> 1 is a step of starting the operation of the heat exchange type ventilation device 1.

  When the user instructs the start of operation by operating the switch 14, the microcomputer 13 receives the information and rotates the motor 5 and the motor 9. Thereby, the heat exchange type | mold ventilation apparatus 1 starts an operation | movement and ventilation of a building is started.

  As for the ventilation amount during operation, the building portion to be ventilated is set to a ventilation amount that can ventilate 0.5 [times / h], but several other operation modes may be provided. For example, a three-step operation mode of a strong mode for ventilation at about 1.0 [times / h], a normal mode for ventilation at 0.5 [times / h], and an absence mode for ventilation at about 0.1 [times / h] Is set so that the user can select the mode by operating the switch 14.

The microcomputer 13 stores in advance the approximate volume of the portion of the building to be ventilated (this will be referred to as the ventilation target volume), and the ventilation frequency [times / h] instructed as described above. The product of the ventilation target volume [m ³ ] is stored as the required ventilation volume [m ³ / h]. The volume of the ventilation target is roughly determined by the area of the part of the building to be ventilated for each model, so multiply the area by the normal ceiling height of the building (about 2.2 to 2.4 [m]). Value.

  Next, S2 in FIG. 2 will be described. S2 is a step of detecting the outside air temperature.

  The microcomputer 13 measures the time after the operation of the heat exchange type ventilation device 1 is started, and stores the value detected by the outside air temperature sensor 11 after a certain time as the outside air temperature. Immediately after the start of operation, the effect of the heat storage of the OA duct and the heat exchange type ventilation device 1 itself is relatively large. Therefore, the value after at least about 10 minutes has elapsed since the start of operation is stored as the outside air temperature.

  Next, S3 in FIG. 2 will be described. S3 is a step of calculating the indoor / outdoor temperature difference.

  The microcomputer 13 calculates the absolute value of the difference between the outside air temperature and the room temperature and stores it as the room outside temperature difference. It is assumed that the indoor temperature is stored in the microcomputer 13 as a preset value. Since the room temperature is considered to vary depending on the performance of the building and the preference of the occupants, the user can set it by operating the switch 14.

  Although the indoor temperature can be detected by a sensor, the room temperature does not change greatly when a person is present in the room. Therefore, even if the room temperature is set in advance, the value of natural ventilation is very large. There is no effect. If a sensor for detecting the room temperature is unnecessary, the cost can be reduced accordingly.

  However, since the room temperature differs greatly in summer and winter, the room temperature in summer and the room temperature in winter may be set. In this case, it is determined from the outside air temperature detected by the outside air temperature sensor 11 whether the present is in summer or winter.

  Next, S4 in FIG. 2 will be described. S4 is a step of calculating the natural ventilation.

  The microcomputer 13 stores in advance the relationship between the indoor / outdoor temperature difference and the number of ventilations by natural ventilation. An example of this relationship is shown in FIG. FIG. 3 is a graph showing the relationship between the indoor / outdoor temperature difference and the number of ventilations by natural ventilation. The higher the C value of the building and the better the airtightness, the smaller the natural ventilation for the same indoor / outdoor temperature difference. For this reason, it is better to prepare several types of relationships between the indoor / outdoor temperature difference and the number of ventilations by natural ventilation according to the airtight performance of the building. FIG. 3 illustrates two types of cases where the C value is 2.0 or more and less than 2.0. The C value of the building can be selected in advance by operating the switch 14 or the like.

The microcomputer 13 calculates the indoor / outdoor temperature difference [K] from the outside air temperature detected by the outside air temperature sensor 11 and the preset indoor temperature, and stores the indoor / outdoor temperature difference stored in advance and the ventilation frequency by natural ventilation. seeking ventilation rate by natural ventilation [times / h] from the relation, and stores as ventilation frequency [times / h] and ventilation target volume [m ^3] natural ventilation a value obtained by multiplying the [m ³ / h] deep.

  Natural ventilation includes buoyancy ventilation due to the temperature difference between the indoor and outdoor of the building and wind ventilation due to outdoor wind. Here, only buoyancy ventilation is considered, but an anemometer is installed outdoors to consider wind ventilation. Is also possible.

  Next, S5 in FIG. 2 will be described. S5 is a step of calculating the target ventilation.

The microcomputer 13 stores the value obtained by subtracting the natural ventilation [m ³ / h] from the necessary ventilation of the stored [m ³ / h] as a target ventilation [m ³ / h]. The target ventilation is a ventilation that can be regarded as being ventilated as much as the necessary ventilation for the part of the building that is subject to ventilation if a sufficient amount of ventilation can be secured as the heat exchange type ventilation device 1. .

At this time, if the natural ventilation is more than the necessary ventilation, that is, if natural ventilation alone is sufficient, the target ventilation is set to 0 [m ³ / h], and the heat exchange type ventilation device 1 Ventilation due to shall be stopped. Thereby, the heat exchange type ventilation apparatus 1 does not consume useless electric power, and is energy saving.

  Next, S6 in FIG. 2 will be described. S6 is a step for performing a ventilation operation.

The microcomputer 13 controls the rotation speeds of the motor 5 and the motor 9 so that the air volume detected by the exhaust air volume sensor 12 becomes the stored target ventilation volume. Of course, when the target ventilation is 0 [m ³ / h], the motor 5 and the motor 9 are stopped. The microcomputer 13 measures the elapsed time from S2 and returns to S2 when a certain time (for example, 1 hour) elapses, but maintains the target ventilation until then until S6 again. To do.

  In the 1st type ventilation that supplies and exhausts air at the same time as the heat exchange type ventilation device 1, the differential pressure between the indoor and the outdoor generated by the device is relatively small, and as a result, the natural ventilation due to the indoor / outdoor temperature difference is considerable. Amount will be generated. If the ventilation rate of the heat exchange type ventilation device 1 is constant throughout the year, if the temperature difference between the indoor and outdoor is large, natural ventilation will be added and over-ventilation will occur. Since the heat exchange type ventilation device 1 ventilates only the target ventilation amount that is obtained by subtracting the natural ventilation amount from the volume, it is not necessary to ventilate more than necessary, so the energy consumed by the heat exchange type ventilation device 1 is also reduced. It is possible to reduce the air conditioning energy of the building, and it is very energy saving.

  By the way, if the heat exchange type ventilator 1 ventilates only the amount obtained by subtracting the natural ventilation amount from the necessary ventilation amount as described above, the natural ventilation amount also increases if the indoor / outdoor temperature difference is large as in a cold region in winter. The target ventilation amount is considerably smaller than the ventilation amount determined as the rated value of the heat exchange type ventilation device 1. In such a case, even if some frost adheres to the heat exchange element, it is considered that it is not necessary to perform defrosting as long as the necessary amount of ventilation can be secured.

  Therefore, hereinafter, the defrosting of the heat exchange type ventilation device 1 and the operation method related thereto will be described in detail with reference to FIG. 2 again.

  First, S7 in FIG. 2 will be described. S7 is a step of inspecting the exhaust air volume.

  The microcomputer 13 measures the time while carrying out the ventilation operation of S6, shifts to S7 periodically (for example, every 20 minutes), and is the exhaust air volume detected by the exhaust air volume sensor 12 insufficient with respect to the target ventilation volume? Inspect whether. If there is no shortage, the process returns to S6 again and the ventilation operation is continued. On the other hand, when the exhaust air volume is insufficient with respect to the target ventilation, the process proceeds to S8.

  Next, S8 in FIG. 2 will be described. S8 is a step of adjusting the rotational speed of the motor.

  The microcomputer 13 increases the rotational speeds of the motor 5 and the motor 9 so that the exhaust air volume detected by the exhaust air volume sensor 12 reaches the target ventilation volume.

  Next, S9 in FIG. 2 will be described. S9 is a step of inspecting the exhaust air volume.

  The microcomputer 13 again checks whether the exhaust air volume detected by the exhaust air volume sensor 12 is insufficient with respect to the target ventilation volume. If there is no shortage, the process returns to S6 again and the ventilation operation is continued. On the other hand, if the exhaust air volume is insufficient with respect to the target ventilation volume, that is, if the exhaust air volume is still insufficient even if the rotational speeds of the motors 5 and 9 are increased within a possible range, the process proceeds to S10.

Next, S10 in FIG. 2 will be described. S10 is a step of determining whether a certain value above T ₁ is the outside air temperature.

  If the exhaust air volume is not enough even if the number of revolutions of the motors 5 and 9 is increased, the heat exchange element 10 is clogged with frost as a cause, and the RA filter 16 is clogged with dust or dust. It is possible. Further, when the motor 5 and the motor 9 are the same motor, the OA filter 15 may be clogged with dust or dust.

Therefore, the microcomputer 13 determines whether or not the outside air temperature sensor 11 detects the outside air temperature constant value T ₁ or more. If it is less than T ₁ , there is a possibility that the heat exchange element 10 is clogged with frost. It performs the defrosting operation, and the OA filter 15 or RA filter 16 because it is not likely jammed frost to the heat exchange element 10 when it is above T ₁ is likely to have clogged, S13 The process proceeds to the step of notifying the user of the abnormality.

  As a result, when the outside air temperature is clearly not frosted in summer or in the middle, the ventilation rate is reduced due to a cause other than frost, and the user is not required to perform an abnormal defrosting operation. Since it can be notified, it is efficient and energy saving.

The value of T ₁ must be a temperature at which the heat exchange element is clearly not frosted. For example, if it is 5 degreeC, the air of EA will also be 0 degreeC or more clearly, and it can be said that there is almost no possibility that the heat exchange element will form frost.

  Next, S11 in FIG. 2 will be described. S11 is a step which performs a defrost operation.

  Although there are several methods for the defrosting operation, any method may be used, and the heat exchange type ventilator 1 is configured to enable each defrosting operation. Here, the microcomputer 13 stops the motor 5 that moves the air supply fan 2, rotates only the motor 9 that moves the exhaust fan 6, and the heat exchange ventilator 1 performs defrosting so that it only exhausts for a certain period of time. To do.

  Next, S12 in FIG. 2 will be described. S12 is a step of inspecting the exhaust air volume.

  The microcomputer 13 increases the number of revolutions of the motor 5 and the motor 9 so that the exhaust air volume detected by the exhaust air volume sensor 12 reaches the target ventilation volume. When the exhaust air volume reaches the target ventilation volume, the microcomputer 13 returns to S6 again and performs the ventilation operation. Do. On the other hand, when the exhaust air volume does not reach the target ventilation volume, it is highly likely that the OA filter 15 or the RA filter 16 is clogged, and the process proceeds to the step of notifying the user of S13 of the abnormality.

  Thereby, even if it is in the situation where frost is attached to the heat exchange element 10, it is possible to notify the user of an abnormality when the ventilation amount is reduced due to a cause other than frost.

  Finally, S13 in FIG. 2 will be described. S13 is a step of notifying the user of the abnormality.

  There are several methods for notifying abnormality, and either method may be used, and the heat exchange type ventilator 1 is configured to enable each method. Here, it is assumed that an alarm 17 (not shown) for making a sound for notifying an abnormality is provided in the vicinity of the switch 14, and the alarm 17 is connected to the microcomputer 13 by wire or wirelessly. Instructs the alarm 17 to make a sound.

  It is assumed that the ventilation operation of the heat exchange type ventilator 1 is continued while the abnormality is notified to the user in S13, and even if the exhaust air volume detected by the exhaust air volume sensor 12 does not reach the target ventilation volume, Repeat S6. While the operation of the heat exchange type ventilation device 1 is continued, the notification of the abnormality by the alarm device 17 is continued, and when the operation of the heat exchange type ventilation device 1 is stopped, the notification of the abnormality by the notification device 17 is also given. When the operation is stopped and then resumed, the operation starts again from S1.

  As a conventional general defrosting operation, there has been a method of measuring the temperature and humidity inside the EA air passage, and performing a defrosting operation when the temperature is near freezing point or the relative humidity is near 100%. . However, in this method, when the element is in a state where frost is formed, the defrosting operation is performed regardless of the fact that the target ventilation amount can be secured, and the continuity of ventilation and the energy saving performance of the device are reduced. There was a problem.

  However, as described above, the defrosting method of the heat exchanging ventilation device 1 does not perform defrosting if the target ventilation is secured even if the heat exchange element 10 is clogged with some frost and the target ventilation is secured. The defrosting is performed only when it is no longer possible to secure the ventilation, and the continuity of ventilation and the energy saving performance of the device can be improved without performing an unnecessary defrosting operation.

  The heat exchange type ventilating apparatus according to the present invention can improve the continuity of ventilation and the energy saving performance of the apparatus without performing an unnecessary defrosting operation, and is therefore used in buildings such as houses and offices. It is useful as a heat exchange type ventilation device.

DESCRIPTION OF SYMBOLS 1 Heat exchange type ventilator 2 Air supply fan 3 Supply air inlet 4 Supply air outlet 5 Motor 6 Exhaust fan 7 Exhaust air inlet 8 Exhaust outlet 9 Motor 10 Heat exchange element 11 Outside air temperature sensor 12 Exhaust air volume sensor 13 Microcomputer 14 Switch 15 OA filter 16 RA filter 17 Alarm

Claims (5)

An air supply means for supplying air from the outside to the room, an exhaust means for exhausting the air from the room to the outside, a heat exchange element for exchanging heat between the supply air and the exhaust air, and the temperature of the outside air An outside air temperature detecting means for detecting, and a control means for controlling the air supply means and the exhaust means in response to a detection result of the outside air temperature detecting means, wherein the control means includes an outside air temperature detected by the outside air temperature detecting means and In a heat exchange type ventilator that calculates the natural ventilation based on the difference from the room temperature and controls the air supply means and the exhaust means so as to obtain a ventilation quantity obtained by subtracting the natural ventilation quantity from the necessary ventilation quantity. Exhaust air volume detection means for detecting the air volume, and the control means receives the detection result of the exhaust air volume detection means, and when the exhaust air volume is less than the ventilation volume obtained by subtracting the natural ventilation volume from the necessary ventilation volume, defrosting is performed. Heat exchanging type for operation Electrical equipment. The heat exchange type ventilator according to claim 1, wherein the room temperature is set to a preset temperature. The control means notifies an abnormality when the exhaust air volume detected by the exhaust air volume detection means is less than the ventilation volume obtained by subtracting the natural ventilation volume from the necessary ventilation volume immediately after performing the operation for defrosting. The heat exchange type ventilator according to 1 or 2. When the outside air temperature detected by the outside air temperature detecting means is equal to or higher than a certain value and the exhaust air volume detected by the exhaust air volume detecting means is less than the ventilation volume obtained by subtracting the natural ventilation volume from the necessary ventilation volume. The heat exchange type ventilator according to any one of claims 1 to 3, which notifies an abnormality. The heat exchange type ventilator according to any one of claims 1 to 4, wherein ventilation is stopped when the natural ventilation calculated by the control means is equal to or greater than a necessary ventilation.

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