The present invention relates to a technical field on air treatment, and particularly relates to a heat exchanger in an air treatment device.
There has conventionally been known an air treatment device including a case having a fresh air port, a supply air port, a return air port, and an exhaust air port. The case is provided therein with a supply air route from the fresh air port to the supply air port, and an exhaust air route from the return air port to the exhaust air port. A fan is provided downstream of each of the supply air route and the exhaust air route. When the fan is driven to rotate, due to negative pressure generated by the fan, outdoor air is sucked into the case via the fresh air port on the supply air route, and the outdoor air exchanges heat in the heat exchanger and then flows into indoors via the supply air port. The air passing the fresh air port receives large resistance from an edge of the fresh air port, and thus has a flow reduced in flow speed at each end in a height direction of the case. The air entering via the fresh air port accordingly has high flow speed at a center in the height direction of the case, and has low flow speed at each of the ends in the height direction of the case.
When the air passes the heat exchanger, flow speed distribution in an air passage is more uneven due to change in flow direction, pressure loss in the heat exchanger, and the like. This affects heat exchange performance of the entire air treatment device.
The air treatment device often needs to be attached in a small attachment space upon actual application, and thus needs to be entirely downsized. This shortens a flow route for air in the air treatment device before entering the heat exchanger. Air sucked via the fresh air port or the return air port then enters the heat exchanger without evenly diffused, and air flowing out of the heat exchanger is also uneven.
An air treatment device includes a case having a fresh air port, a supply air port, a return air port, and an exhaust air port. The case is provided therein with a supply air route from the fresh air port to the supply air port, and an exhaust air route from the return air port to the exhaust air port. The supply air route and the exhaust air route are each provided with a fan. The case accommodates a heat exchanger configured to cause heat exchange between air flowing in the supply air route and air flowing in the exhaust air route. The heat exchanger includes multiple layers of heat exchange core fins, and multiple layers of films stacked alternately. The films adjacent to each other interpose an air flow passage allowing air to flow therethrough. A section perpendicular to an air flow direction of an air flow path in the case and upstream of the heat exchanger includes a first region and a second region. The first region is higher in air flow speed than the second region. In the heat exchanger, the films adjacent to each other have a gap H1 in a region corresponding to the first region, and a distance H2 in a region corresponding to the second region, with H1<H2.
An air treatment device according to each of an embodiment and a modification example of the present invention will be hereinafter described with reference to
As depicted in
The air treatment device 100 thus configured has a fresh air mode where, as indicated by arrow RA, fresh air entering from outdoors via the fresh air port 11 exchanges heat in the heat exchanger 40 and then flows through the fresh air fan 20 to be eventually sent indoors via the supply air port 12, a return air mode where, as indicated by arrow RB, indoor air enters the heat exchanger 40 via the return air port 13 and exchanges heat and then flows through the exhaust air fan 30 to be eventually sent out via the exhaust air port 14, and an internal circulation mode where, as indicated by arrow RC, indoor air enters the case via the return air port 13, and directly flows through the fresh air fan 20 without passing the heat exchanger 40 to be eventually sent indoors via the supply air port 12.
The air treatment device 100 in the above described three modes achieves indoor air treatment with use of outdoor air as well as air treatment with direct use of indoor air.
The heat exchanger 40 according to the present embodiment includes a heat exchange core 41 and a lid plate 42. The heat exchange core 41 is constituted by multiple layers of heat exchange core fins and multiple layers of films alternately stacked in the first direction X. The heat exchange core 41 is herein principally constituted by paper produced with use of dedicated fibers through a special process. Such paper has high moisture permeability and high airtightness, and is characterized by tearing resistance, aging resistance, and fungiproofness. The fibers are disposed with small gaps to allow passage of only water vapor molecules having small particle size, to achieve total heat exchange of the heat exchange core 41.
As depicted in
As depicted in
The second core fin group 412 is formed by multiple layers of second core fins 412a and multiple layers of second films 412b alternately stacked in the first direction X. One of the second films 412b and adjacent one of the second films 412b also interpose the supply air passage RA1 allowing air in the supply air route RA to flow therethrough and the exhaust air passage RB1 allowing air in the exhaust air route RB to flow therethrough. Both the supply air passages RA1 and the exhaust air passages RB1 in the second core fin group 412 have gaps H2, and H1 and H2 satisfy H1<H2.
As depicted in
The supply air passage RA1 and the exhaust air passage RB1 are thus partitioned in the heat exchanger 40 to achieve independent heat exchange between air in the supply air route RA and air in the exhaust air route RB. Air flowing out of the first region Q1 and having high flow speed receives resistance while passing the first core fin group 411 in the heat exchanger 40, and the resistance is larger than resistance received by air flowing out of the second region Q2 and having low flow speed while passing the second core fin group 412 in the heat exchanger 40. Accordingly, air flowing out after heat exchange in the heat exchanger 40 has even flow speed distribution in the first direction X, and air adjacent to an inlet of the heat exchanger 40 also has gradually equalized flow speed distribution in the first direction X. This achieves even heat exchange in the first direction X in the heat exchanger 40, for improvement in heat exchange performance of the entire heat exchanger 40.
As depicted in
This configuration causes air flowing out of the first region Q1 and having high flow speed to flow into the heat exchanger 40 via the branch flow passages having narrow length in the second direction Y, as well as causes air flowing out of the second region Q2 and having low flow speed to flow into the heat exchanger 40 via the branch flow passages having wide length in the second direction Y. Accordingly, resistance received in the heat exchanger 40 by the air flowing out of the first region Q1 can be made larger than resistance received in the heat exchanger 40 by the air flowing out of the second region Q2. Accordingly, air flowing out after heat exchange in the heat exchanger 40 has even flow speed distribution in the second direction Y, and air adjacent to the inlet of the heat exchanger 40 also has gradually equalized flow speed distribution in the first direction X. This achieves even heat exchange in the second direction Y in the heat exchanger 40, for improvement in heat exchange performance of the entire heat exchanger 40.
Such setting of size in both the first direction X and the second direction Y of the supply air route RA1 and the exhaust air route RB1 in the heat exchanger 40 achieves further even flow speed distribution of air flowing out after heat exchange in the heat exchanger 40. Alternatively, the size in the first direction or an X direction of the supply air route RA1 and the exhaust air route RB1 in the heat exchanger 40 can be set individually, or the size in the second direction or a Y direction of the supply air route RA1 and the exhaust air route RB1 in the heat exchanger 40 can be set individually.
Description is made to specific installation of the heat exchange core fins in the heat exchanger.
A designer typically sets predetermined average supply air volume q1 of an air treatment device, and matches a corresponding fan and a heat exchange area S of a heat exchanger in accordance with the predetermined average supply air volume q1.
Specifically, assume that a selected fan actually has average supply air volume q2. A relation q1>q2 indicates that the heat exchanger 40 has large pressure loss. In this case, in order for decrease in pressure loss of the entire heat exchanger, the second core fin group 412 having the large gaps in the heat exchanger 40 can be increased in stacking number (i.e. sets of the second core fin 412a and the second film 412b are increased in a number m). A relation q1<q2 indicates that the heat exchanger 40 has small pressure loss. In this case, in order to increase in pressure loss of the entire heat exchanger as well as further equalized heat exchange with air in the heat exchanger 40, the first core fin group 411 having the small gaps in the heat exchanger 40 can be increased in stacking number (i.e. combination of the first core fin 411a and the first film 411b are increased in a number n).
According to an average gap H=(mH2+nH1)/(m+n) of the heat exchanger thus designed, the values H1 and H2 are appropriately selected to satisfy H=(H1+H2)/2.
In a case where the present embodiment selects 2.0 mm as the value H1 and 2.6 mm as the value H2, the average gap H is (2.0+2.6)/2=2.3 mm.
Designing as described above enables sufficient heat exchange between air flowing in the first core fin group 411 and air flowing in the second core fin group 412, to equalize heat exchange in the heat exchanger and improve performance of the entire heat exchanger.
As depicted in
As depicted in
Accordingly, in the heat exchanger 40 depicted in
As depicted in
In comparison to the above embodiment, the section perpendicular to the air flow direction of the air flow path in the case 10 is further divided in the first direction X, and the heat exchange core fins in the heat exchanger 40 in the first direction X, to further equalize flow speed in the first direction X of air obtained by heat exchange in the heat exchanger 40.
Described above are the embodiment and the modification example of the present invention. In addition to the technical ideas according to the embodiment of the modification example, elements of the embodiment and the modification example can be combined to obtain additional technical ideas of the present invention without departing from the purpose of the present invention.
According to the embodiment and the modification example described above, the heat exchange core fins being stacked in the heat exchange core 41 are each made of paper. The present invention is not limited to this case. The heat exchange core 41 may alternatively be formed by stacking cores made of a material such as resin and moisture permeable films made of a high polymer material.
According to the embodiment and the modification example described above, the first region having high air flow speed is located at the center in the first direction, and the second region having low air flow speed is located at each of the ends in the first direction. The present invention is not limited to this case. Alternatively, the first region having high air flow speed may be located at each of the ends in the first direction, and the second region having low air flow speed may be located at the center in the first direction.
According to the embodiment and the modification example described above, the section perpendicular to the air flow direction of the air flow path at the fresh air port 11 is divided into the first region and the second regions, or into the first region, the second regions, and the third regions in the first direction X. The present invention is not limited to this case. Alternatively, the section may alternatively be divided into more regions.
According to the embodiment and the modification example described above, the length W1 in the second direction Y of each of the branch flow passages in the first core fin group 411 and the length W2 in the second direction Y of each of the branch flow passages in the second core fin group 412 are simply set to satisfy W1<W2. The present invention is not limited to this case, and a length W3 in the second direction Y of each branch flow passage in the third core fin group 413 may be further set to satisfy W1<W3<W2.
According to the embodiment and the modification example described above, the first region corresponds to the position in the first direction of the fresh air port or the return air port. The present invention is not limited to this case, and the first region may alternatively correspond to a position in the first direction of a fan volute.
In the embodiment and the modification example described above, the heat exchange core may be assembled by combining core fin groups, may be assembled by stacking independent core fins one by one, or may be assembled by providing core fins having different gaps to be substantially equal in height to the corresponding regions.
According to the embodiment and the modification example described above, as depicted in
According to the embodiment and the modification example described above, the core fin groups in the heat exchange core are stacked in the first direction X. The present invention is not limited to this case, and the core fin groups in the heat exchange core may alternatively be stacked in the second direction Y.
The embodiment and the modification example described above provides only one heat exchanger. The present invention is not limited to this case, and there may alternatively be provided a plurality of heat exchangers.
Number | Date | Country | Kind |
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202110415448.X | Apr 2021 | CN | national |
This is a continuation of International Application No. PCT/JP2022/017600 filed on Apr. 12, 2022, which claims priority to Chinese Patent Application No. 202110415448.X, filed on Apr. 18, 2021. The entire disclosures of these applications are incorporated by reference herein.
Number | Date | Country | |
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Parent | PCT/JP2022/017600 | Apr 2022 | US |
Child | 18380140 | US |