JPH0712382A - Heat exchanger for ventilation - Google Patents

Abstract

PURPOSE:To avoid rise or fall of air pressure of an area to be ventilated from an external air pressure of the area to be ventilated by so operating air flow rate regulating means that an air flow rate ratio of exhaust air to the atmosphere becomes a set ratio based on detection information of atmospheric amount detecting means and exhaust air amount detecting means. CONSTITUTION:Control means C so operates an operating motor M of an exhaust damper D1 to automatically regulate an opening of the damper D1 that an air flow rate ratio Qo:Qe of an air flow rate Qe of exhaust air EA to be detected by a differential pressure detector S1 of exhaust air amount detecting means to an air flow rate Qo of the atmosphere OA to be detected by an air flow rate sensor S2 of atmospheric air amount detecting means. Thus, a ventilating heat exchanger 7 heat exchanges the air EA with the atmosphere OA to recover warm heat, cold, and automatically regulates-maintains a flow rate of the exhaust air to be exhausted from the area to be ventilated and a flow rate of the atmosphere to be introduced to the area to be ventilated to a desired set ratio.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation heat exchange device provided with heat exchange means for exchanging heat between exhaust air discharged from a ventilation target area to the outside and outside air taken into the ventilation target area from the outside.

[0002]

2. Description of the Related Art The above-mentioned ventilation heat exchange device is used either alone or in a state where it is connected to an air conditioner for cooling and heating the ventilation target area (which is also the temperature control target area) in the ventilation of the ventilation target area. If you use it alone,
By exchanging heat between the exhaust air discharged from the ventilation target area to the outside and the outside air taken into the ventilation target area from the outside, the amount of heat (hot or cold heat) discharged from the ventilation target area to the outside together with the exhaust gas is collected as much as possible, , Ventilate the target area while keeping warm and cold heat in the target area.

When connecting to an air conditioner for use,
In the operation of mixing the outside air with the temperature-controlled air supplied from the air conditioner to the ventilation target area, when discharging part of the return air returning from the ventilation target area to the air conditioning apparatus to the outside as exhaust air, By exchanging heat with the intake outside air and recovering heat in the same manner as above, cooling and heating and ventilation are applied to the ventilation target area while saving energy.

In the conventional heat exchange device for ventilation as described above, an artificial damper is used for the air volume ratio between the air volume of the exhaust gas discharged from the ventilation target area to the outside and the air volume of the outside air taken into the ventilation target area from the outside. Only the initial settings were made by operation.

[0005]

However, in the above-mentioned prior art, the exhaust air and the intake air are taken in by the clogging of the equipment filter, the change in the fan performance of the ventilation fan over time, or the switching of the operating mode of the connected air conditioner. The air volume ratio of and changes from the desired set ratio, so, for example, even though the initial setting is made so that the exhaust gas and the external air volume are equal, the exhaust volume becomes less than the external air volume and the ventilation The air pressure (internal pressure) in the target area (for example, one room) is higher than the air pressure (outside pressure) outside the ventilation target area (for example, in an adjacent room or corridor), or conversely, the exhaust volume is greater than the external air volume. Then, the air pressure (internal pressure) in the ventilation target area becomes lower than the external air pressure (external pressure), and when the internal pressure becomes higher than the external pressure, the outside is reluctant to invade odors and cigarette smoke. Ventilation If there is a problem such as leakage of odors or cigarette smoke in the elephant area, or if the external pressure is lower than the internal pressure, odors, smoke, or drafts from the outside in addition to the intake air for ventilation are in the ventilation target area. There was a problem such as the problem of entering the

Further, when a clean room, an animal breeding room, a laboratory, or the like is set as a ventilation target area, air leakage from the ventilation target area to the outside other than a predetermined exhaust destination is surely prevented, or intake for ventilation is performed. For the purpose of surely preventing air from entering the ventilation target area from outside other than the outside air, the internal air pressure of the ventilation target area should be set by intentionally making a difference between the exhaust volume and the outside air volume in the initial air volume ratio setting. In some cases, the external pressure may be different from the external pressure. However, even in such a case, there is a problem in that the desired internal / external pressure condition is uncertainly maintained due to the same change in the air volume ratio as described above.

The present invention has been made in view of the above circumstances, and an object thereof is to make it possible to stably maintain the air flow rate ratio between exhaust gas and outside air at a desired value and solve the above problems. There is a point to try.

[0008]

The ventilation heat exchange device according to the present invention is characterized in that an outside air amount detecting means for detecting an air amount of outside air to be taken in, an exhaust amount detecting means for detecting an air amount of exhaust gas to be exhausted, An air volume adjusting means for adjusting the air volume ratio of the outside air and the exhaust air is provided, and based on the detection information of the outside air volume detecting means and the exhaust air volume detecting means, the air volume ratio of the exhaust air and the outside air becomes a set ratio. The point is that a control means for operating the air volume adjusting means is provided.

[0009]

According to the characterizing feature of the present invention, the air volume ratio between the exhaust air volume detected by the exhaust volume detection means and the outside air volume detected by the outside air volume detection means is a set ratio (for example, 1: 1 or , A desired ratio), the control means actuates the air flow rate adjusting means, thereby exchanging heat from the exhaust air with the outside air to recover hot or cold heat. The air volume of the exhaust gas and the air volume of the outside air taken into the ventilation target area are automatically adjusted and maintained at a desired set ratio.

[0010]

According to the characteristic configuration of the present invention, for example, when the air flow rate ratio between exhaust gas and outside air is set to 1: 1, the filter is clogged, the fan performance changes over time, or the connected air conditioner operates. Regardless of form switching etc., 1: 1
The set air volume ratio is maintained, and the air pressure (internal pressure) in the ventilation target area (for example, one room) becomes higher or lower than the air pressure (external pressure) outside the ventilation target area (for example, in the adjacent room or corridor). Therefore, it is avoided that the internal pressure becomes higher than the external pressure, and conversely, when the external pressure is lower than the internal pressure, that is, the odor in the ventilation target area, cigarette smoke, etc. It is possible to surely prevent the trouble of leaking to the outside of the vehicle, the trouble of odor and smoke other than the intake air for ventilation, or the draft from the outside from entering the ventilation target area.

Also, in the case where the exhaust amount and the outside air amount are intentionally made different from each other so that the inner pressure and the outer pressure in the ventilation target area are different from each other, the clogging of the filter, the change of the fan performance over time, or the connection may also occur. Regardless of the operation mode switching of the air conditioner or the like, the set air volume ratio can be stably maintained, and the desired internal / external pressure condition can be reliably maintained.

Moreover, when the ventilation heat exchange device according to the present invention is used by being connected to an air conditioner, it is necessary to additionally equip the air conditioner with a device / mechanism for adjusting the air volume ratio between the exhaust air and the outside air. Instead, the above-described action and effect can be obtained only by connecting the ventilation heat exchange device, which is particularly advantageous when the air conditioner is an existing one.

[0013]

EXAMPLES Next, examples will be described.

In FIG. 9, I and P are interior zones as ventilation target areas in intelligent buildings,
And a perimeter zone, and 1 is an air conditioner for the interior zone I and the perimeter zone P.

In the air conditioner 1, the airframe is divided into an indoor unit 1a and an outdoor unit 1b, and these units 1a,
1b is a separate type heat pump type air conditioner connected to each other by a refrigerant pipe 2, and basically,
The combined return air RA from the interior zone I and the perimeter zone P is temperature-controlled for each zone by the indoor unit 1a, and the temperature-controlled air is supplied to the respective zones I and P by the supply air S.
i, Sp is sent from the indoor unit 1a to each zone I, P.

In each of the interior zone I and the perimeter zone P, based on the detection of the temperature in the zone, the amount of air supplied to each zone I, P is adjusted so as to adjust and maintain the temperature in the zone at a set temperature. Air volume of Si, Sp)
Is equipped with a variable air volume device 3 that automatically adjusts.

A part of the combined return air RA from both zones I and P is exhausted to the outside as an exhaust air EA, and the remaining return air RA whose temperature is controlled in the indoor unit 1a is equal to the exhaust air outside air OA. Are mixed, whereby both zones I and P are ventilated together with cooling and heating.

In the indoor unit 1a, 4a is a first heat exchanger for adjusting the temperature of the supply air Si for the interior zone I, 4b is a second heat exchanger for adjusting the temperature of the supply air Sp for the perimeter zone P, and 5a, Reference numeral 5b denotes first and second humidifiers for humidifying the supply air Si, Sp for each zone I, P after temperature control, and 6a, 6b for supplying first supply air Si, Sp to each zone I, P. And a second air supply fan,
ex1 and ex2 are electronic expansion valves, respectively.

On the other hand, in the outdoor unit 1b, 4c is an outdoor heat exchanger for absorbing and radiating the outdoor air OA, 6c is an outdoor fan for ventilating the outdoor air OA to the outdoor heat exchanger 4c, and C
m is a refrigerant compressor, Vc is a four-way valve, and ac is an accumulator.

The first and second heat exchangers 4a and 4b, the expansion valves ex1 and ex2, the outdoor heat exchanger 4c, the compressor Cm, the accumulator ac, and the four-way valve Vc are the main constituent devices of the heat pump H, and these constituent devices. By circulating the refrigerant through the compressor Cm over the first and second heat exchangers 4
The temperature control function of a and 4b is performed.

The air conditioner 1 can selectively perform the cooling operation and the heating operation by switching the refrigerant path in the heat pump H by operating the valve. In FIG. 9, the outdoor heat exchanger 4c functions as a condenser. In addition, the outdoor heat exchanger 4 is configured so that each of the first and second heat exchangers 4a and 4b serves as a refrigerant path that functions as an evaporator.
While radiating c to the outside air OA, the first and second
The heat exchangers 4a and 4b adjust the cooling temperatures of the supply air Si and Sp to the zones I and P, respectively, to thereby cool the interior zone I and the perimeter zone P respectively.

That is, in the operating state shown in FIG. 9, the high-pressure vapor refrigerant discharged from the compressor Cm (indicated by the thick black line in the figure) is supplied to the outdoor heat exchanger 4c via the four-way valve Vc, The condensed liquid refrigerant (indicated by a thick line with hatching in the figure) that is condensed by the outdoor heat exchanger 4c and subsequently sent out from the outdoor heat exchanger 4c is passed through the expansion valves ex1 and ex2 to the first and second sides. The refrigerant is distributed and supplied to the heat exchangers 4a and 4b to evaporate the condensed liquid refrigerant in each of the first and second heat exchangers 4a and 4b, and then the first and second heat exchangers 4a and 4b.
The evaporated low-pressure vapor refrigerant (shown by a white thick line in the figure) sent from b is merged and returned to the compressor Cm via the four-way valve Vc and the accumulator ac.

Reference numeral 7 in the drawing denotes a heat exchange unit as a ventilation heat exchange device for exchanging heat between the exhaust air EA as a part of the return air RA and the intake outside air OA for ventilation. Exhaust EA in cooling due to heat exchange in
The cold heat of the exhaust gas EA is recovered, and the heat of the exhaust gas EA is recovered by the heating.

As shown in FIG. 2, the indoor unit 1a and the heat exchanging unit 7 are installed adjacent to each other, and the casings of the units 1a and 7 face each other when the two units 1a and 7 are installed adjacent to each other. The first communication item 8a for guiding the exhaust air EA from the indoor unit 1a to the heat exchange unit 7, and the heat exchange unit 7 to the indoor unit 1 are provided on the side wall portions (X-X line in the figure is a facing contact portion) to be brought into contact.
A second communication port 8b is formed to guide the outside air OA for ventilation to a.

2 to 6 (note that FIGS. 3, 4, and 5 are sectional views taken along the line AA, BB, and X- in FIG. 2, respectively). X
(Showing a line cross section), the return air RA introduced into the unit from the return air port 9 of the casing upper wall is led out to the heat exchange unit 7 as the exhaust air EA through the first communication port 8a. , The air to be introduced into the return air chamber 10 in the unit, and the introduced return air RA after the exhaust flow diversion in the return air chamber 10 and the outside air OA for return air introduced from the second communication port 8b. Are mixed.

Further, the return air R mixed in the return air chamber 10
The mixed air of A and the outside air OA is separately distributed to each of the first and second heat exchangers 4a and 4b through the ventilation passage 11 at the inner bottom of the unit, and these first and second heat exchanges are performed. The air (that is, the air supply Si, Sp for each zone I, P) that has passed through the chambers 4a, 4b is installed in the upper part of the unit by the first and second air supply fans 6a, 6b. The second air supply ports 12a and 12b are configured to separately deliver the air.

Reference numeral 13 denotes the first and second air supply fans 6a, 6
While the return air RA and the ventilation outside air OA from the heat exchange unit 7 are taken into the return air chamber 10 by the suction action of b, an adjustment damper that gives resistance to the introduction of the return air into the return air chamber 10. By adjusting the opening degree of the adjustment damper 13, the resistance to the introduction of the return air is changed to change the return air chamber 1
The ratio of the return air introduction amount to 0 and the outside air introduction amount is adjusted (in other words, the ventilation outside air amount in the supply air Si, Sp to each zone I, P is adjusted).

Reference numeral 14 denotes the return air chamber 10 and the first heat exchanger 4
A bypass path that short-circuits the downstream region of a and a bypass damper 15 that opens and closes the bypass path 14 are closed during normal cooling and heating operation.

Further, in the figure, each f is a filter.

Reference numeral 16 denotes an operation controller. The operation controller 16 adjusts and maintains the temperatures of the supply air Si and Sp to the zones I and P to the respective set supply air temperatures. Two
While adjusting the temperature control output of the heat exchangers 4a and 4b and automatically adjusting the air flow rates of the supply air Si, Sp by the air flow rate changer 3, the supply air supply Si, Sp to each zone I, P is sent. The outputs of the first and second air supply fans 6a and 6b are adjusted so as to adjust and maintain the static supply pressure at the set pressure, and the ventilation outside air from the heat exchange unit 7 is adjusted in response to the adjustment of the supply air amount. OA
The adjustment damper 13 is automatically operated so as to maintain a predetermined fixed amount or a predetermined constant ratio with respect to the adjusted supply air amount.

On the other hand, in the heat exchange unit 7, the main outside air passage 18a for guiding the outside air OA introduced from the outside air outlet 17 of the top plate to the second communication port 8b, and the exhaust gas introduced from the first communication port 8a. A main exhaust passage 20a for guiding the EA to the exhaust port 19 of the top plate is formed in the unit, and the total heat exchange section 21 as heat exchange means is arranged so as to extend over the main outside air passage 18a and the main exhaust passage 20a. Equipped in the unit,
As a result, in normal cooling and heating operation, the exhaust air EA introduced from the indoor unit 1a to the heat exchange unit 7 via the first communication port 8a and the indoor unit 1 via the second communication port 8b.
The total heat exchanging portion 21 heat-exchanges the outside air OA taken in from the outside air port 17 as the ventilation outside air to be sent to the a, so that the cold heat of the introduced exhaust gas EA is held in the cooling mode, and the introduced exhaust gas EA is heated in the heating mode. The retained heat is collected.

Reference numeral 22 sucks and introduces the exhaust air EA from the indoor unit 1a into the heat exchange unit 7 through the first communication port 8a, and exhausts the exhaust air EA after passing through the unit to the exhaust port 19
It is an exhaust fan that is sent out from the exhaust fan 22. In this embodiment, the exhaust fan 22 always operates at a constant output.

D1 is an exhaust damper that constantly operates the exhaust fan 22 at a constant output, and adjusts the air volume Qe of the exhaust EA by adjusting the opening degree of the exhaust fan 22 on the discharge side. This exhaust damper D1 Serves as an air volume adjusting means for adjusting the air volume ratio between the air volume Qe of the exhaust air EA and the air volume Qo of the ventilation outside air OA.

18b is an outside air O introduced from the outside air outlet 17.
A is bypassed without passing through the total heat exchange section 21
An outside air bypass passage leading to the communication port 8b, 20b is an exhaust bypass passage leading to the exhaust port 19 by bypassing the exhaust gas EA introduced from the first communication port 8a without passing through the total heat exchange section 21, and 23 Is the outside air taken in from the outside air outlet 17
A switching damper 24 for selecting whether to pass A to the main outside air passage 18a or to the outside air bypass passage 18b is also provided with an exhaust gas EA introduced from the first communication port 8a. It is a switching damper that selects whether to pass the passage 20a or the exhaust bypass passage 20b. In a normal cooling and heating in which the total intake air OA and the exhaust air EA are heat-exchanged in the total heat exchange section 21, Both the switching dampers 23 and 24 are closed.

In the heat exchange unit 7, an air volume sensor S1 as an outside air volume detecting means for detecting the air volume Qo of the ventilation outside air OA is provided near the second communication port 8b in the outside air path in the unit. As shown in FIG. 7, a differential pressure detector for detecting a downstream static pressure p1 of the exhaust damper D1, an intake static pressure p2 of the exhaust fan 22 and a differential pressure Δp as exhaust volume detection means for detecting the air volume of the exhaust EA. Equipped with S2.

Further, as shown in FIG. 1, as the control means for operating the exhaust damper D1 based on the detection information of the air flow sensor S1 and the differential pressure detector S2, the above difference when operating the exhaust fan 22 at a constant output. While the relationship F (see FIG. 8) between the pressure Δp and the exhaust air flow rate Qe is stored in advance,
The air volume Qe of the exhaust gas EA is calculated based on the memory relationship F and the differential pressure Δp detected by the differential pressure detector S2, and the air volume ratio between the calculated exhaust air volume Qe and the external air volume Qo detected by the air volume sensor S1. Is provided with an air volume ratio control unit C that automatically adjusts the opening degree of the exhaust damper D1 by operating the operation motor M of the exhaust damper D1 so as to be a set ratio (for example, 1: 1).

That is, in the heat exchange unit 7 that handles the exhaust air EA and the ventilation outside air OA in the state where the air passage is connected to the indoor unit 1a, the air volume ratio between the exhaust air EA and the ventilation outside air OA is automatically adjusted to the set ratio. As a result, the pressures inside and outside the zones I and P as the ventilation target areas are stably maintained at desired conditions (that is, in the case where the set target ratio is 1: 1, each zone is controlled). The internal pressures of I and P are kept the same as those of the outside).

In this example, the indoor unit 1a
A configuration in which the air volume ratio control unit C is configured by using a microcomputer in the operation controller 16 (that is, the air volume sensor S
1 and the exhaust damper D based on the detection information of the differential pressure detector S2
1) is executed with a partial function of the microcomputer in the operation controller 16),
When the indoor unit 1a and the heat exchange unit 7 are installed adjacent to each other, the air flow sensor S, the differential pressure detector S2, and the operation controller 1
6 is connected by a control signal line.

For both zones I and P, not only normal cooling and heating operation but also so-called outside air cooling can be performed. In this outside air cooling operation, the adjustment damper 1 in the indoor unit 1a
3 is fully closed, and the switching dampers 23, 24 in the heat exchange unit 7 are fully opened, so that the total amount of return air RA from both zones I, P is exhausted as the exhaust gas EA.
Outside air OA taken in from the outside air port 20 while being discharged through the communication port 8a, the exhaust bypass passage 20b, and the exhaust port 19
Is introduced into the indoor unit 1a through the outside air bypass passage 18b, and only this outside air OA is sent out from the first and second air supply ports 12a, 12b as the air supply Si, Sp for each zone I, P.

In this outside air cooling operation, the air quantity Qo of the intake outside air OA increases as compared with the above-mentioned normal cooling and heating operation. Against this, the air quantity is detected based on the detection information of the air quantity sensor S1 and the differential pressure detector S2. By the exhaust damper opening degree control executed by the ratio control unit C, the exhaust air EA and the outside air O
The air volume ratio Qe: Qo of A is automatically adjusted to the set ratio.

The bypass passage 14 and the bypass damper 15 in the indoor unit 1a are for dehumidifying the interior zone I in the outside air cooling operation.
In performing this dehumidification, the bypass damper 15 is opened, and a part of the introduced outside air OA from the second communication port 8b is short-circuited to the downstream side of the first heat exchanger 4a via the bypass passage 14. By operating the first heat exchanger 4a as an evaporator, the first heat exchanger 4a cools and dehumidifies the passing outside air OA that has been reduced in quantity due to a partial short circuit, and the cooled dehumidified air and the short-circuited outside air from the bypass passage 14 The interior zone I is dehumidified by merging with OA in the downstream region of the first heat exchanger 4a and sending the combined air as the supply air Si for the interior zone I from the first supply port 12a.

[Other Embodiments] Next, other embodiments will be listed.

(1) In the above embodiment, the heat exchange unit 7 as a ventilation heat exchange device is connected to the air conditioner 1a by the air passage, but the present invention is connected to the air conditioner by the air passage. It can also be applied to a heat exchange device for ventilation that is used alone without.

(2) The control means C for operating the air volume adjusting means D1 based on the detection information of the outside air amount detecting means S1 and the exhaust air amount detecting means S2 uses the CPU on the side of the connected air conditioner as in the above-mentioned embodiment. It may be configured, or may be configured as a single control device equipped in the ventilation heat exchange device.

(3) To detect the air volume Qe of the exhaust EA,
The frequency correlation of the exhaust fan 22, the opening degree of the exhaust damper D1, and the exhaust air flow rate Qe are stored in advance, and the exhaust fan frequency and the exhaust damper opening degree at each time point are stored based on the stored correlation. Exhaust air volume Qe
May be obtained, or a mode in which the air flow rate Qe of the exhaust gas EA is detected by using a wind speed sensor or a wind turbine sensor may be adopted, and the specific air flow rate detection configuration of the exhaust gas amount detection means S2 may be variously changed. Is possible.

(4) Similarly, with respect to the outside air amount detecting means S1 for detecting the air amount Qo of the outside air OA, the specific air amount detecting structure can be variously changed.

(5) The ventilation heat exchange device according to the present invention comprises:
The exhaust fan 22 that blows the exhaust air EA and the outside air fan that blows the outside air OA may be both provided, or only one of them may be provided, and both the exhaust fan 22 and the outside air fan may be provided. Outside air OA is provided by a separate air blower that is not provided and is provided for the ventilation area.
-Ventilation of the exhaust air EA may be performed.

(6) Exhaust damper D1 as in the above embodiment
Air flow ratio Q of outside air OA and exhaust air EA only by adjusting the opening of
o: Instead of adjusting Qe, output adjustment of the exhaust fan 22, output adjustment of the outside air fan, opening adjustment of the outside air damper,
Or, by combining them, the outside air OA and the exhaust air E
A mode in which the air volume ratio Qo: Qe of A is adjusted may be adopted, and the specific configuration of the air volume adjusting means for adjusting the air volume ratio Qo: Qe of the outside air OA and the exhaust air EA can be variously modified.

(7) The set air volume ratio between the outside air OA and the exhaust air EA is not limited to 1: 1 and the set ratio may be appropriately determined according to the use of the ventilation target area and the like.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a schematic control block diagram.

FIG. 2 is a front sectional view.

3 is a sectional view taken along line AA in FIG.

4 is a sectional view taken along line BB in FIG.

5 is a sectional view taken along line XX in FIG.

FIG. 6 is a plan view.

FIG. 7 is a configuration diagram of an exhaust amount detection means.

FIG. 8 is a graph for explaining a displacement detection mode.

[Figure 9] Overall system diagram of air conditioning equipment

[Explanation of symbols]

 I, P Ventilation target area EA Exhaust air OA Outside air S1 Outside air amount detecting means S2 Exhaust amount detecting means D1 Air volume adjusting means C Control means

Claims (1)

[Claims] 1. Exhaust air (EA) discharged from the ventilation target area (I, P) to the outside and the ventilation target area (I, P) from the outside
A heat exchange device for ventilation comprising a heat exchange means (21) for exchanging heat with the outside air (OA) to be taken in, the outside air amount detecting means (S1) for detecting an air volume (Qo) of the outside air (OA) to be taken in, Exhaust volume detection means (S2) for detecting the exhaust air volume (Qe) of the exhaust air (EA) and air volume control means (D1) for adjusting the air volume ratio (Qo: Qe) between the outside air (OA) and the exhaust air (EA). And an air flow rate ratio (Qo: Qe) between the exhaust air (EA) and the outside air (OA) is set based on the detection information of the outside air amount detecting means (S1) and the exhaust amount detecting means (S2). A heat exchange device for ventilation, which is provided with a control means (C) for operating the air volume adjusting means (D1) so as to obtain a ratio.