JPH0413028A - Heat exchanging ventilator - Google Patents

Abstract

PURPOSE:To suitably select a heat exchanging ventilation or a normal ventilation by delaying the start of control of switching means for switching the exchanging ventilation and the normal ventilation until a time required to guide the air from outside, after the start, to the vicinity of a predetermined position through an air feed duct is elapsed. CONSTITUTION:After a predetermined time T is elapsed after an operation switch is closed to start to drive air supply and discharge fans 28, 38, a damper 34 is controlled to be opened or closed by referring to an indoor temperature Tr and an outdoor temperature To to be respectively detected by temperature detectors 60r, 60o. That is, the start of controlling to open or close the damper 34 is delayed by the time T. Accordingly, even if there is a difference between a temperature near the detectors 60r, 60o and indoor, outdoor temperatures in a period immediately after the start, the damper 34 is not wastefully operated, but the heat exchanging ventilation or the normal ventilation is suitably selected accurately corresponding to the indoor and outdoor temperatures.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a heat exchange ventilation device that performs ventilation while exchanging heat between air exhausted from a room and outside air supplied into the room. .

<Conventional technology> Conventionally, in order to reduce the energy required for air conditioning and to provide comfortable air conditioning, there has been a system in which air is supplied from outdoors to indoors and air exhausted from indoors to outdoors. A heat exchange ventilation system is used that performs ventilation while exchanging heat. A typical heat exchange ventilation system is disclosed, for example, in Japanese Patent Application Laid-Open No. 61-295443, and its configuration is shown in FIG. 6 of the present application. The casing 1 is formed with indoor and outdoor air supply ports 2 and 3, and indoor and outdoor exhaust ports 4.5. The indoor air supply port 3 and the outdoor air supply port 5 each have an air supply fan 6,
There are 7 exhaust fans installed.

Outdoor air is led into the casing 1 from the outdoor air supply port 2 via the air supply duct 12, passes through the heat exchanger 8, and is ventilated from the indoor air supply port 3 via the air supply duct 13. Air is supplied to the room where the process is to be carried out. In addition, air from the room is led into the casing 1 from the indoor side exhaust port 4 via the exhaust duct 14, passes through the heat exchanger 8, and is discharged outdoors from the outdoor side exhaust port 5 and the exhaust duct 15. Ru. In this way, the heat exchanger 8 performs heat exchange between the air exhausted from the room and the outside air supplied into the room. As a result, the outside air is brought into the room after its temperature has been brought close to that of the indoor air, which reduces the energy required for air conditioning, and allows outside air with a large temperature difference to be supplied into the room. This allows for comfortable air conditioning.

In the passage 9 between the outdoor side and indoor side air supply ports 2 and 3, there is a damper 11 which is rotated in the direction of the arrow 10 by a structure not shown.
is installed. With this damper 11, the passage 9 is blocked and the outside air is supplied indoors through the heat exchanger 8, and the outside air is supplied indoors by bypassing the heat exchanger 8. You can choose between normal ventilation, which performs air supply and exhaust without heat exchange with indoor air.

Switching between heat exchange ventilation and normal ventilation by driving the damper 11 is performed by an outdoor temperature sensor 160 placed near the outdoor air supply port 2 and an indoor temperature sensor 16r placed near the indoor air exhaust port 4. This is done based on the detection output of For example, in the intermediate seasons between spring and autumn, it is better to supply outside air directly into the room without exchanging heat between the indoor air and the outside air, or to achieve comfortable air conditioning. The damper 11 is placed in the position shown by the two-dot chain line in FIG. 6, and the passage 9 is opened.

Whether or not it is in the intermediate period can be detected by setting the necessary indoor and outdoor temperature ranges for heating and cooling. In addition, even if it is not the middle of the year, for example, in the summer when air conditioning is used, the temperature of the indoor air may be higher than the outside air in the area where the stove is located, such as in the kitchen. In this case, if heat exchange ventilation is used, the indoor temperature will rise and the cooling efficiency will be questioned. Therefore, if the indoor temperature is higher than the outdoor temperature while cooling,
In order to perform normal ventilation, the damper 11 is placed at the position shown by the two-dot chain line with the passage 9 open.

<Problem to be solved by the invention> However, in the above-mentioned conventional technology, the detection of indoor and outdoor temperatures is difficult.
The temperature of the air supplied from outdoors via the air supply duct 12 is detected by an outdoor temperature detector 16o, and the temperature of air from the room via the exhaust duct 14 is detected by an indoor temperature detector 16r. Therefore, the above duct 12.14
If the length is long, the temperature sensor 16r,
The temperature of the air near 16 o'clock and the temperature inside and outside the room are not necessarily the same.

For this reason, when starting up the ventilation system, selection between heat exchange ventilation and normal ventilation is not always made appropriately. Therefore, during the period after the start of the engine until the indoor and outdoor air reaches the vicinity of the temperature detectors 16r and 16o, there is a risk that good ventilation may not be performed, and the control of the damper 11 may be performed in vain. There is a possibility that it will happen.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a heat exchange ventilation system that solves the above-mentioned technical problems, allows selection between heat exchange ventilation and normal ventilation, and eliminates wasteful control.

<Means for Solving the Problems> The heat exchange ventilation device of the present invention for achieving the above object exchanges heat between air led from outdoors through an air supply duct and air led from indoors. a heat exchanger for performing heat exchange and supplying the air from the outdoors after heat exchange to the room to be ventilated, and discharging the air from the indoor room after heat exchange to the outdoors; and the air passing through the air supply duct. and a switching means for switching at least one distribution route of air led from the room between a route passing through the heat exchanger and a route bypassing the heat exchanger, and a first temperature detector that is placed at a predetermined position in any of the air passages guided to the heat exchanger and detects the temperature of the guided air; and a first temperature detector that detects the temperature of the air guided from the room to the heat exchanger. A heat exchange ventilation apparatus comprising: a second temperature detector for detecting a temperature; and a control means for controlling the switching means based on outputs of the first and second temperature detectors, wherein either the control means or the switching means controls the switching means. The apparatus includes means for delaying the start of control of the means until a time required for air from the outdoors to be introduced into the vicinity of the predetermined position via the air supply duct after start-up has started.

<Operation> According to the above configuration, there are two types: heat exchange ventilation, which performs ventilation while exchanging heat between the air from outdoors and the air exhausted from indoors using a heat exchanger, and ventilation, which performs ventilation without performing the heat exchange. The switching means for switching between normal ventilation and normal ventilation is not controlled based on the outputs of the first and second temperature detectors during the period immediately after the start of the heat exchange ventilation system. The first temperature sensor is placed at a predetermined position in the air passageway that leads the air from the outdoors to the heat exchanger via the air supply duct.

The control means for controlling the switching means starts controlling the switching means after the time required for the air from the outdoors to be guided to the vicinity of the predetermined position has elapsed after starting the heat exchange ventilation system. That is, after the temperature of the outdoor air is accurately detected by the first temperature sensor,
Control of the switching means is then started. As a result, the control means does not control the switching means unnecessarily, and the control means controls the switching means only during the period when the outdoor temperature is accurately detected by the first temperature sensor. Optimal ventilation conditions are achieved.

<Example> Embodiments will be described in detail below with reference to the accompanying drawings showing examples.

FIG. 3 is a plan view showing a simplified internal configuration of a heat exchange ventilation system according to an embodiment of the present invention, and FIG. 4 is a side view showing the internal configuration. This heat exchange ventilation device is used, for example, with an air conditioner (not shown) that performs cooling and heating, and air from the outdoors is guided from the air supply duct 21 through the outdoor air supply port 22, and air from the room is guided from the air supply duct 21 through the outdoor air supply port 22. A casing 25 is provided which is led from an exhaust duct 23 through an indoor exhaust port 24. The outside air from the outdoor air supply port 22 flows along a path 29 from the air supply passage 26 through the heat exchanger 27 to the air supply fan 28, passes from the air supply fan 28 to the indoor air supply port 30, and then enters the air supply. Air is supplied into the room from the air duct 31.

On the other hand, indoor air from the indoor side exhaust port 24 is supplied to a passage near the indoor side exhaust port 24, and is driven by the damper motor DM and the connecting rod 32 to rotate in the direction of the arrow 33. It flows through the casing 25 according to one of the paths 35 and 36. That is, when the damper 34 is in the position shown by the solid line in FIG. . On the other hand, damper 34 or 3
When in the position shown by the two-dot chain line in the figure, the exhaust passage 3
7 to the exhaust fan 38 through the casing 25. In this way, in this embodiment, the switching means includes the tamper 34, the damper motor DM, and the like.

Indoor air from the exhaust fan 38 is exhausted outdoors from the outdoor exhaust port 40 via the exhaust duct 41. In addition, 4
2 is a filter of the heat exchanger 27.

An outdoor temperature detector 600, which is a first temperature detector for detecting the temperature of outside air, is disposed inside the casing 25 near the outdoor air supply port 22, and an outdoor temperature sensor 600, which is a first temperature detector for detecting the temperature of outside air, is disposed inside the casing 25 near the outdoor air supply port 22. An indoor temperature detector 60r, which is a second temperature detector for detecting the temperature of indoor air, is disposed within the indoor temperature sensor 25. The temperature detectors 60o and 60r may be configured using, for example, thermistors.

FIG. 1 is a block diagram showing the electrical configuration of the heat exchange ventilation system of this embodiment. The outdoor temperature detector 600 and the indoor temperature detector 60r are connected to the control circuit 50. This control circuit 50 is connected to a power source (not shown) from a single-phase 20
A voltage of 0V is supplied via a step-down transformer 51. The control circuit 50 also includes, for example, the duct 23.
31 is connected to the remote control unit 5 installed in the room.
2 are connected.

This remote control unit 52 can automatically switch on/off the heat exchange ventilation system, switch the air volume (strong wind or weak wind), switch between heat exchange ventilation and normal ventilation, and switch between normal ventilation and heat exchange ventilation. A switch 52a is provided for switching between the automatic mode, which is performed, and the manual mode, which is manually performed.

Electric power from the power supply device is supplied from lines 53 and 54 to the air supply motor M1 of the air supply fan 28 via switches SIH and SIL, and also to the exhaust motor M1 of the exhaust fan 38 via switches S2H and S2L. It is supplied to M2. Switches S]H and S2H are respectively connected to motor M1.
The switches SIL and S2L are connected to the high-speed rotation terminals TIH and T2H of the motor M2, respectively, and the switches SIL and S2L are connected to the high-speed rotation terminals TIH and T2H of the motor M2, respectively.
are connected to respective low-speed rotation terminals TIL and T2L. Either one of the switches SIH and SIL is turned on, and the motor M1 is switched between two states: high-speed rotation and low-speed rotation. The same applies to the switch 52H32L.

Furthermore, the power from the power supply device is supplied to an open limit switch 55o or a close limit switch 55s from a changeover switch SW for switching between normal ventilation and heat exchange ventilation.
is supplied to the damper motor DM via. The open limit switch 55o is a switch that is turned off when the damper 34 reaches the end position indicated by the two-dot chain line when the damper 34 rotates from the position indicated by the solid line in FIG. 3 to the position indicated by the two-dot chain line. be. In addition, the close limit switch 55s is
This is a switch that is turned off when the damper 34 reaches the rotation end position shown by the solid line when the damper 34 rotates from the position shown by the two-dot chain line to the position shown by the solid line in FIG.

FIG. 2 is a flowchart for explaining the operation of the control circuit 50. In step n1, the main power is turned on, and when the main power is turned on, the changeover switch SW or the close limit switch 55s is connected in step n2, and the damper 34 is set to the solid line position in FIG. 3, and the passage 39 is blocked. The state will be as follows. In the following, the case where the damper 34 is in the solid line position in FIG.
It is said that the C damper 34 is in the open state when it is in the position shown by the two-dot chain line in FIG.

In step n3, it is determined whether the operation switch is turned on or not by referring to the signal from the remote control unit 52. If it is not turned on, in step n4, the damper 3
4 is closed, and further, in step n5, both the air supply motor MI and the exhaust motor M2 are turned off, that is, switches SIH, SQL, S2H, and S2L are all shut off, and the air supply fan is turned off. 28 and exhaust fan 38
to stop. Therefore, in the stopped state, the damper 34
is in an open state to prevent pests and the like from entering from outside through the passageway 39.

If the operation switch is turned on in step n3, ill
If it is disconnected, the process proceeds to step n6, and the switch SIH, 32
H or s] L and 2L are electrically connected and the supply/exhaust motor M
1. M2 is energized and the supply/exhaust fans 28, 38 are driven.

In step n7, it is determined in the remote control unit 52 whether the automatic operation mode in which heat exchange ventilation and normal ventilation are automatically selected is selected. When the automatic operation mode is selected, in step n8, a predetermined time ΔT (for example, 20 to 30 seconds) after the operation switch is turned on is determined by referring to the time measured by a timer (not shown) that starts when the operation switch is turned on. It is determined whether or not the period has elapsed. If this predetermined time ΔT has not elapsed, the process waits until this time elapses, and then the process moves to step n9. The predetermined time ΔT is such that indoor air reaches the vicinity of the location of the indoor temperature detector 60r via the exhaust duct 23, and outdoor air reaches the location of the outdoor temperature detector 60o via the air supply duct 41. The time taken is longer than the time required to reach the vicinity.

In step n9, it is determined whether the indoor temperature Tr detected by the indoor temperature detector 60r and the outdoor temperature TO detected by the outdoor temperature detector 60o are both in the range of 20 to 24°C, for example. . In this embodiment, in the control circuit 50, the minimum indoor temperature and minimum outdoor temperature that require cooling are set to 24°C, and the maximum indoor temperature and maximum outdoor temperature that require heating are set to 20°C. There is. Therefore, in the above temperature range, heating and cooling are not necessary, and an air conditioner (not shown) is operated to blow air.

If the judgment in step n9 is affirmative, that is, if the air conditioner performs the blowing operation, step nl
After proceeding to step n, the damper 34 is brought into a closed state.
Return to 3.

When it is determined in step n9 that the indoor temperature Tr or the outdoor temperature To is not within the above range (20 to 24°C), the process proceeds to step nll.

In this step nil, Tr≦24 and TO≧24 or Tr≧24 and TO≧20 It is determined whether or not it holds true. Temperature Tr, T.

If the above temperature condition is satisfied, the process proceeds to step n]2, where it is determined whether the outdoor temperature TO is higher than the indoor temperature Tr, and if the outdoor temperature To is higher, the process proceeds to step n.
Heat exchange ventilation is performed by opening the damper 34 at lO. When the outdoor temperature To is not higher than the indoor temperature Tr, the process proceeds from step n12 to step n13, where the damper 34 is opened and normal ventilation is performed.) If the judgment in step ni+ is negative, step Proceed to n14. In step n14, it is determined whether Tr≦20 and TO≦24 or Tr≧20 and TO≦20 hold true. When this condition is satisfied, the indoor temperature Tr is changed to the outdoor temperature T in step n15.
It is checked whether the indoor temperature TrO is higher than TrO, and if the indoor temperature TrO is higher, the damper 34 is closed in step n10 and heat exchange ventilation is performed.

If it is determined in step n15 that the indoor temperature TO is higher than the outdoor temperature Tr, the process moves to step n13, where the damper 34 is opened and normal ventilation is performed.

If it is determined in step n14 that the indoor temperature Tr and the outdoor temperature To do not satisfy the above conditions, the process returns to step n3.

If it is determined in step n7 that the automatic mode is not selected by the remote control unit 52, the process proceeds to step n16, in which it is determined whether heat exchange ventilation is selected.

When heat exchange ventilation is selected, step nlo
If not, proceed to step n13.

The processes of steps n9 to n15 described above are summarized in FIG. In FIG. 5, the area indicated by the diagonal line upward to the right,
That is, the indoor temperature Tr is equal to the above indoor minimum temperature (straight line RA
:24°C) or above and the outdoor temperature To is above the above maximum outdoor temperature (line OB: 20''C), or when the indoor temperature Tr is below the above indoor minimum temperature (straight line RA) and the outdoor temperature To is above the above The area indicating the case where the outdoor minimum temperature (linear OA, 24°C) or higher is the cooling area where the air conditioner performs cooling operation.Furthermore, in this cooling area, when the outdoor temperature To is higher than the indoor temperature Tr. , that is, To=
In the area to the left of the straight line 11 indicating Tr, heat exchange ventilation is performed, and the outdoor temperature To is lower than the indoor temperature Tr! Normal ventilation occurs in the area to the right of 1.

On the other hand, in FIG. 5, the area indicated by the diagonal line upward to the left, that is, the indoor temperature Tr is the maximum indoor temperature (straight line RB: 20
°C) and the outdoor temperature To is below the above minimum outdoor temperature (linear OA), or the indoor temperature Tr is above the above indoor maximum temperature (straight line RB) and the outdoor temperature To is below the above maximum outdoor temperature (OB) The area in which case is shown is a heating area where heating operation is performed by the air conditioner. Further, in this heating region, when the outdoor temperature To is higher than the indoor temperature Tr, that is, in the region to the left of the straight line 12 indicating To=Tr, normal ventilation is performed, and when the outdoor temperature To or the indoor temperature T
Heat exchange ventilation takes place in the region to the right of straight line r2 lower than r.

Both outdoor temperature To and indoor temperature Tr are 20 to 24.
In the area surrounded by the straight lines OA, OB, and RARB, which are in the temperature range of 0.degree.

In this way, when the automatic mode automatically selects heat exchange ventilation or normal ventilation, the optimal ventilation state is selected according to the operating state of the air conditioner, the indoor temperature Tr, and the outdoor temperature TO. This allows for energy saving and optimization of air conditioning.

As described above, in this embodiment, after the operation switch is turned on and the supply/exhaust fans 28, 38 start driving, the temperature detectors 60r, 60o are turned on after a predetermined time ΔT has elapsed.
Opening/closing control of the damper 34 is performed with reference to the indoor temperature Tr and the outdoor temperature To detected. That is, the start of the opening/closing control of the damper 34 is delayed by the predetermined time ΔT. Therefore, after indoor and outdoor air is guided to the vicinity of the temperature detectors 60r and 60o through the ducts 23.2, the opening and closing of the damper 34 is controlled based on the outputs of these temperature detectors 60r and 60o. Therefore, even if there is a difference between the temperature near the temperature detectors 60r and 60o and the temperature inside and outside the room immediately after starting, the damper 34 will not be unnecessarily controlled, and the heat exchange ventilation operation will not be performed. Normal ventilation operation, etc.
Appropriate selection will now be made in accordance with the indoor and outdoor temperatures. Furthermore, in this embodiment, the damper 34 is kept in the closed state for a period after the operation switch is turned on until the damper 34 is controlled based on the outputs of the temperature detectors 60r and 60o (see Fig. 2). Step n2) can prevent air with a large temperature difference from being supplied into the room.

For example, for the above time ΔT <5ec), the length of the duct 21 connecting the outdoor air supply port 22 with the outdoor air supply port 22 is calculated as L (m).
, its diameter is D (m), and the amount of air supplied by the air supply fan 28 is Q (rr?/h), and is calculated as follows.

For example, L = 60 (m), D = 0.25 (m), and the wind jlQ is 720 (rn'/h) when the wind is strong.
, assuming that it is 510 (rr?/h) when the wind is weak,
When the wind is strong, ΔT = 7.9 (sec), and when the wind is weak, it is ΔT-11,1 (sec). Also, L=50
(m), D=0.2 (m), and the wind IQ is 500 (rn'/h) in strong winds and 330 (rn'/h) in weak winds.
rn'/h), then in strong winds △T= l
1.3 (sec), △T=25,7 (
sec). However, approximately △T-30 (sec
), it is thought that unnecessary control of the damper 34 during the period immediately after the start of startup can be prevented.

Note that the present invention is not limited to the above-described embodiments. For example, in the above-mentioned embodiment, a damper is provided in the exhaust route, and the air from the room is switched between heat exchange ventilation and normal ventilation depending on whether the air is guided to the route via the heat exchanger or the heat exchanger is bypassed. Although the configuration has been described as an example, the present invention can be easily applied to the configuration I in which a damper is provided in the air supply path and the ventilation operation is changed by changing the outside air path.

In the above embodiment, after starting, the outdoor air detector 600
Control of the damper 34 is started after the time required for the outside air to be introduced into the vicinity of the room temperature sensor 60r and the air from the room to be introduced near the room temperature sensor 60r. Since it is considered that the difference between the temperature near 60r and the indoor temperature is not large, the damper 34 is controlled so that at least the outside air is detected by the outdoor temperature sensor 60 after starting the engine.
It is sufficient to start after the time required to be guided to the vicinity of 0 has elapsed.

Further, in the above-described embodiments, the heat exchange ventilation device is connected to the outdoors and indoors using ducts, but the present invention can be installed, for example, by being embedded in the ceiling. The present invention can also be easily applied to a heat exchange ventilation system in which indoor air from an exhaust port formed in the ceiling is guided to a heat exchanger without going through a duct.

Further, in the above-described embodiment, the outdoor temperature detector 600 is provided inside the casing 25 of the heat exchange ventilation system, but it may also be provided within the air supply duct 21, for example. That is, the temperature detector for detecting the temperature of the outside air may be disposed at any predetermined position in the air path leading to the heat exchanger 27 via the air supply duct 21.

Furthermore, in the above-described embodiment, the damper 34 is kept in the closed state during the period after the operation switch is turned on until the control of the damper 34 based on the indoor and outdoor temperatures is started. Such control of the damper 34 may be omitted.

Various other design changes can be made without changing the gist of the present invention.

<Effects of the Invention> As described above, according to the heat exchange ventilation system of the present invention, the switching means for switching between heat exchange ventilation and normal ventilation after the first temperature detector accurately detects the outdoor temperature. Since the control is started, the switching means is prevented from being controlled unnecessarily. Further, since the switching means is controlled only during the period when the temperature of the outdoor air is accurately detected by the first temperature detector, the ventilation operation state can be appropriately selected.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the electrical configuration of a heat exchange ventilation system according to an embodiment of the present invention, FIG. 2 is a flowchart for explaining the operation of the control circuit 50, and FIG. FIG. 4 is a simplified side view of the internal configuration; FIG. 5 is a diagram that summarizes the control operations corresponding to indoor and outdoor temperatures; and FIG. 6 is a cross-section showing the conventional technology. It is a diagram. Fig. 5 21...Air supply duct, 27...Heat exchanger, 34...
- Damper, 39... Bypass passage, 50... Control circuit (control means), 60o... Outdoor temperature detector (first temperature detector), 60r... Indoor temperature detector (second temperature detector) Temperature detector), SW...changeover switch, DM...damper motor Patent applicant Daikin Industries, Ltd.

Claims (1)

[Claims] 1. Heat exchange is performed between the air led from outdoors through the air supply duct (21) and the air led from indoors, and the air from the outdoors after heat exchange is a heat exchanger (27) that provides ventilation to the room to be ventilated and exhausts the air from the room after heat exchange to the outdoors; switching means (34, DM) for switching at least one of the distribution routes between a route (35) passing through the heat exchanger (27) and a route (36) bypassing the heat exchanger (27); , a first temperature detector (1) disposed at a predetermined position in any of the passages of air guided to the heat exchanger (27) via the air supply duct (21), and detecting the temperature of the guided air; 6
0o), a second temperature detector (60r) that detects the temperature of the air led from the room to the heat exchanger (27), and the outputs of the first and second temperature detectors (60o, 60r). control means (34, DM) for controlling the switching means (34, DM) based on
50), wherein the control means (50) includes the switching means (34, DM
) is characterized by including means for delaying the start of the control until the time required for air from the outdoors to be guided to the vicinity of the predetermined position via the air supply duct (21) after the start of startup has elapsed. heat exchange ventilation equipment.