US20110036541A1 - Heat exchange ventilator - Google Patents

Heat exchange ventilator Download PDF

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Publication number
US20110036541A1
US20110036541A1 US12/936,806 US93680608A US2011036541A1 US 20110036541 A1 US20110036541 A1 US 20110036541A1 US 93680608 A US93680608 A US 93680608A US 2011036541 A1 US2011036541 A1 US 2011036541A1
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United States
Prior art keywords
heat exchange
exchange element
air
outdoor
indoor
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US12/936,806
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English (en)
Inventor
Masaru Takada
Shigeki Onishi
Hidemoto Arai
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Assigned to MITSUBISHI ELECTRIC CORPORATION reassignment MITSUBISHI ELECTRIC CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ARAI, HIDEMOTO, ONISHI, SHIGEKI, TAKADA, MASARU
Publication of US20110036541A1 publication Critical patent/US20110036541A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
    • F24F12/001—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air
    • F24F12/006—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air using an air-to-air heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/30—Arrangement or mounting of heat-exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
    • F24F12/001—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air
    • F24F2012/007—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air using a by-pass for bypassing the heat-exchanger
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/56—Heat recovery units

Definitions

  • the present invention relates to a heat exchange ventilator that provides ventilation while performing exchange of sensible heat or exchange of latent heat between two air flows different to each other in temperature or humidity.
  • a heat exchange ventilator that carries out heat exchange between outdoor air taken from outdoors and indoor air exhausted from indoors during ventilation, by a heat exchange element.
  • Such heat exchange ventilator is required to carry out the heat exchange while ensuring a desired ventilation air volume, and to collect heat from exhaust air (indoor air) to supply air (outdoor air).
  • downsizing of the heat exchange ventilator is required. For example, because in order to reserve a wide space for a habitable room, generally the spatial height of a loft is designed to be as small as possible, it is required to make the height of the heat exchange ventilator to be placed in such as a loft, as low as possible.
  • an air conditioner similarly to an air conditioner described in Patent Document 1, an air conditioner has been known that includes a humidifier in its inside, and is configured to humidify indoor air taken from an indoor air inlet with the humidifier while taking indoor air from another indoor air inlet, and to blow out indoor air into the room again that is cooled by a heat exchange element between the humidified indoor air and the not-humidified indoor air; however, such air conditioner has a large heat loss and is inefficient, therefore, a heat source is not internally arranged in many of heat exchange ventilators.
  • Patent Document 2 describes a total heat exchanger in which a plurality of heat exchange elements is arranged in series in a flowing direction of air.
  • Patent Document 3 describes a ventilator in which a plurality of heat exchangers is arranged in a casing that includes an inlet and an outlet of an intake fluid, and an inlet and an outlet of an exhaust fluid.
  • an air duct diameter in a heat exchange element small in order to improve heat exchange efficiency; if the air duct diameter in a heat exchange element is small, the air duct tends to be easily blocked with frost, consequently, sometimes air may not flow through the heat exchange element, and ventilation cannot be carried out in a worst case.
  • Patent Document 4 describes a heat exchange ventilator that includes a low-temperature duct through which cold air (outdoor air) flows, a high-temperature duct through which hot air (indoor air) flows, and a damper that controls a communication and a separation with the low-temperature duct and the high-temperature duct, and is configured to prevent frost from forming in the high-temperature duct by performing anti-icing operation of flowing hot air through the low-temperature duct as required.
  • Patent Document 5 describes an anti-icing system that includes a cold air inlet that leads inward outdoor air and a hot air inlet that leads inwards indoor air, an air outlet that supplies the above outdoor air or the above indoor air to a heat exchange ventilator, a damper that selectively closes the cold air inlet and the hot air inlet, and a heating element that is provided in the vicinity of the air outlet and heats air; and is configured to melt frost in the heat exchange ventilator by applying power to the heating element as required.
  • Patent Document 6 describes a heat exchange ventilator that the inside of a housing is partitioned with partition plates into a supply route and an exhaust root; a heat exchange element is provided at a cross point between the routes; an opening is provided on a partition plate on an upstream side of the heat exchange element; a damper that causes the supply route and the exhaust route to communicate with each other is provided to the opening; the supply route and the exhaust route are communicated with each other by turning the damper as required, so that frost deposited on the heat exchange element is removed.
  • Patent Document 7 describes a heat exchange ventilator that an air-flow separating unit is provided on an exhaust plane of indoor air in a heat exchanger, thereby preventing water produced by a defrost operation from frosting again afterwards.
  • Patent Document 8 describes a heat exchange ventilator that is provided with an opening on a partition that partitions between an air duct of hot air (indoor air) after passing through a heat exchange element and an air duct of cold air (outdoor air) before passing through the heat exchange element, and provided with a damper to the opening, and controls an operation of the damper as required, mixes the hot air into the cold air and returns it into a room again, thereby constantly performing ventilation while preventing the heat exchange element from freezing.
  • a heat exchange ventilator that is provided with an opening on a partition that partitions between an air duct of hot air (indoor air) after passing through a heat exchange element and an air duct of cold air (outdoor air) before passing through the heat exchange element, and provided with a damper to the opening, and controls an operation of the damper as required, mixes the hot air into the cold air and returns it into a room again, thereby constantly performing ventilation while preventing the heat exchange element from freezing.
  • Patent Document 1 Japanese Patent Application Laid-open No. S61-107020
  • Patent Document 2 Japanese Patent Application Laid-open No. 2006-337015
  • Patent Document 3 Japanese Patent Application Laid-open No. 2000-146250
  • Patent Document 4 Japanese Utility Model Application Laid-open No. S62-17743
  • Patent Document 5 Japanese Patent Application Published No. H3-50180
  • Patent Document 6 Japanese Patent Application Laid-open No. 2005-331193
  • Patent Document 7 Japanese Patent Application Laid-open No. 2001-235199
  • Patent Document 8 Japanese Patent Application Laid-open No. 2007-170712
  • Any of conventional heat exchange ventilators or conventional anti-icing systems that can prevent frost on a heat exchange element is configured either to stop ventilation during an anti-icing operation (a defrost operation), or to mix supply air (outdoor air) and exhaust air (indoor air), so that during the anti-icing operation, the ventilation cannot be carried out, or a ventilation air volume decreases. Therefore, to keep the ventilation air volume per unit of time during the anti-icing operation equal to a ventilation air volume during a usual operation, a processing air rate during the anti-icing operation has to be higher than a processing air rate during the usual operation, and a heat exchange element needs to be upsized in order to maintain a heat exchange efficiency during the anti-icing operation equal to the heat exchange efficiency during the usual operation.
  • the present invention has been made to solve the above problems, and an object of the present invention is to obtain a heat exchange ventilator that easily achieve prevention of condensation and frost on a heat exchange element and an improvement in the heat exchange efficiency, while limiting a height dimension of the equipment.
  • a heat exchange ventilator includes a supply air duct that takes in outdoor air and blows it out indoors, an exhaust air duct that takes in indoor air and blows it out outdoors, and a plurality of heat exchange elements that exchanges heat between outdoor air flowing down through the supply air duct and indoor air flowing down through the exhaust air duct, the heat exchange elements being arranged in series from an outdoor side to an indoor side, wherein a sensible heat exchange efficiency of a heat exchange element arranged on a most outdoor side is higher than a sensible heat exchange efficiency of a heat exchange element arranged on an indoor side adjacent to the heat exchange element arranged on the most outdoor side.
  • a heat exchange ventilator includes a supply air duct that takes in outdoor air and blows it out indoors, an exhaust air duct that takes in indoor air and blows it out outdoors, and a plurality of heat exchange elements that exchanges heat between outdoor air flowing down through the supply air duct and indoor air flowing down through the exhaust air duct, the heat exchange elements being arranged in series from an outdoor side to an indoor side, wherein a latent heat exchange efficiency of a heat exchange element arranged on a most outdoor side is lower than a latent heat exchange efficiency of a heat exchange element arranged on an indoor side adjacent to the heat exchange element arranged on the most outdoor side.
  • a heat exchange ventilator includes a supply air duct that takes in outdoor air and blows it out indoors, an exhaust air duct that takes in indoor air and blows it out outdoors, and a plurality of heat exchange elements that exchanges heat between outdoor air flowing down through the supply air duct and indoor air flowing down through the exhaust air duct, the heat exchange elements being arranged in series from an outdoor side to an indoor side, wherein a sensible heat exchange efficiency of a heat exchange element arranged on a most outdoor side is higher than a sensible heat exchange efficiency of a heat exchange element arranged on an indoor side adjacent to the heat exchange element arranged on the most outdoor side, and a latent heat exchange efficiency of the heat exchange element arranged on the most outdoor side is lower than a latent heat exchange efficiency of the heat exchange element arranged on an indoor side adjacent to the heat exchange element arranged on the most outdoor side.
  • any of the heat exchange ventilators according to the present invention include a plurality of heat exchange elements arranged in series, thereby being able to increase heat exchange efficiency, compared with a case of performing heat exchange only with a single heat exchange element.
  • the heat exchange efficiency is equal to that of the heat exchange ventilator with the single heat exchange element can be obtained.
  • a sensible heat exchange efficiency of a heat exchange element arranged on the most outdoor side is higher than the sensible heat exchange efficiency of a heat exchange element arranged on an indoor side adjacent to the heat exchange element arranged on the most outdoor side
  • the temperature of indoor air flowing into the heat exchange element positioned on the most outdoor side is higher than that in a case where the respective sensible heat exchange efficiencies of the heat exchange elements are equal, consequently, condensation and frost are hard to be produced on the heat exchange element during heat exchange with outdoor air.
  • the heat exchange ventilators according to the present invention in one of them in which the latent heat exchange efficiency of a heat exchange element arranged on the most outdoor side is lower than the latent heat exchange efficiency of a heat exchange element arranged on an indoor side adjacent to the most outdoor side, the humidity of indoor air flowing into the heat exchange element positioned on the most outdoor side is lower than that in a case where the respective latent heat exchange efficiencies of the heat exchange elements are equal, consequently, condensation and frost are hard to be produced on the heat exchange element during heat exchange with outdoor air.
  • the air duct diameter in the heat exchange element can be made small and its heat exchange efficiency can be easily improved. Accordingly, the heat exchange ventilator according to the present invention easily achieves prevention of condensation and frost on a heat exchange element and an improvement in the heat exchange efficiency, while limiting a height dimension of the equipment.
  • FIG. 1 is a vertical cross-sectional view that schematically depicts an example of a heat exchange ventilator according to the present invention
  • FIG. 2 is a perspective view that schematically depicts two heat exchange units used in the heat exchange ventilator shown in FIG. 1 ;
  • FIG. 3-1 is a perspective view that schematically depicts a heat exchange element used in the heat exchange ventilator shown in FIG. 1 ;
  • FIG. 3-2 is a front view that schematically depicts the heat exchange element shown in FIG. 3-1 ;
  • FIG. 4 is a vertical cross-sectional view that schematically depicts an example of a heat exchange ventilator among heat exchange ventilators according to the present invention, of which a plurality of individual heat exchange elements is adjusted by changing the volume and the heat-transfer area of each of the heat exchange elements;
  • FIG. 5-1 is a perspective view that schematically depicts an example of a heat exchange element that can be used in the heat exchange ventilator according to the present invention, and includes an air duct having a rectangular cross section;
  • FIG. 5-2 is a front view that schematically depicts the heat exchange element shown in FIG. 5-1 ;
  • FIG. 6 is a graph that indicates an example of respective measurement results of variations with time in before-and-after differential pressure in a heat exchange element on which condensation and frost is controlled, and variations with time in before-and-after differential pressure in a heat exchange element on which condensation and frost is in progress;
  • FIG. 7 is a table that indicates respective measurement results of the total heat exchange efficiency and an average pressure-loss increase-speed ratio obtained with respect to each of heat exchange ventilators according to each of Examples 1 to 3, Reference Examples 1 and 2, and Comparative Examples 1 and 2.
  • FIG. 1 is a vertical cross-sectional view that schematically depicts an example of a heat exchange ventilator according to the present invention
  • FIG. 2 is a perspective view that schematically depicts two heat exchange units used in the heat exchange ventilator shown in FIG. 1 .
  • component members shown in FIG. 2 component members that are also shown in FIG. 1 are assigned with the same reference numerals as those used in FIG. 1 .
  • a heat exchange ventilator 50 A shown in FIG. 1 includes a housing 10 ; two heat exchange units 15 A and 15 B arranged in a center of the housing 10 ; an outdoor air inlet 20 a, an outdoor air outlet 20 b, an indoor air inlet 25 a, and an indoor air outlet 25 b each of which is attached to the housing 10 ; a supply air fan 30 arranged in the housing 10 , an exhaust air fan 35 arranged in the housing 10 , and a control unit (not shown) that controls operations of the supply air fan 30 and the exhaust air fan 35 .
  • three horizontal partitions 3 a, 3 b, and 3 c, and four vertical partitions 5 a, 5 b, 7 a, and 7 b are provided inside the housing 10 .
  • the two of the horizontal partitions 3 a and 3 b, and the two of the vertical partitions 5 a and 5 b are separated from each other in the center and slightly outdoor side, at which the first heat exchange unit 15 A is arranged.
  • the two of the horizontal partitions 3 b and 3 c, and the two of the vertical partitions 7 a and 7 b are separated from each other in the center and slightly indoor side in the housing 10 , at which the second heat exchange unit 15 B is arranged.
  • the first heat exchange unit 15 A includes a frame 11 A and a heat exchange element 13 A accommodated in the frame 11 A
  • the second heat exchange unit 15 B includes a frame 11 B and a heat exchange element 13 B accommodated in the frame 11 B.
  • the heat exchange units 15 A and 15 B are arranged in series with each other such that the heat exchange elements 13 A and 13 B are laid, and a current flowing down through one of the heat exchange elements flows into the other heat exchange element.
  • the outdoor air inlet 20 a attached to the housing 10 shown in FIG. 1 communicates with a space below the horizontal partition 3 a in the housing 10
  • the outdoor air outlet 20 b communicates with a space below the horizontal partition 3 c in the housing 10
  • the indoor air inlet 25 a communicates with a space above the horizontal partition 3 c in the housing 10
  • the indoor air outlet 25 b communicates with a space above the horizontal partition 3 a in the housing 10 .
  • the supply air fan 30 is arranged below the horizontal partition 3 c in the housing 10 .
  • the supply air fan 30 operates under the control of the control unit, and a supply air flow SF that is taken from outdoor air and blows out indoors is formed inside the heat exchange ventilator 50 A by driving the supply air fan 30 .
  • the outdoor air inlet 20 a functions as an inlet of the supply air flow SF
  • the outdoor air outlet 20 b functions as an outlet of the supply air flow SF.
  • the outdoor air taken from the outdoor air inlet 20 a into the heat exchange ventilator 50 A passes through the first heat exchange unit 15 A, flows into the space above the horizontal partition 3 b, and blows out indoors via the second heat exchange unit 15 B, the supply air fan 30 , and the outdoor air outlet 20 b.
  • a flow of outdoor air in the supply air flow SF is denoted by a dash-single-dot line CL 1 .
  • a flow of outdoor air is denoted by an arrow A in dash-single-dot line.
  • the exhaust air fan 35 is arranged above the horizontal partition 3 a in the housing 10 .
  • the exhaust air fan 35 operates under the control of the control unit, an exhaust air flow EF that is taken from indoor air and blow out outdoors is formed inside the heat exchange ventilator 50 A by driving the exhaust air fan 35 .
  • the indoor air inlet 25 a functions as an inlet of the exhaust air flow EF
  • the indoor air outlet 25 b functions as an outlet of the exhaust air flow EF.
  • the indoor air taken from the indoor air inlet 25 a into the heat exchange ventilator 50 A passes through the second heat exchange unit 15 B, flows into the space below the horizontal partition 3 b, and blows out outdoors via the first heat exchange unit 15 A, the exhaust air fan 35 , and the indoor air outlet 25 b.
  • a flow of indoor air in the exhaust air flow EF is denoted by a dash-double-dot line CL 2 .
  • a flow of indoor air is denoted by an arrow B in dash-double-dot line.
  • the heat exchange ventilator 50 A having such configuration is characterized by a combination of the heat exchange element 13 A and the heat exchange element 13 B (see FIG. 2 ), therefore, each of the heat exchange elements 13 A and 13 B is explained below in detail with reference to FIGS. 3-1 and 3 - 2 .
  • Each of the heat exchange elements 13 A and 13 B is a total heat exchange element of a cross flow type.
  • partition members 13 a in sheet form and spacing members 13 b in wave form are alternately layered, and a top plate 13 c in the same configuration as the partition member 13 a is layered on the top of the spacing members 13 b.
  • a plurality of air flow paths FP is formed between the partition member 13 a and the spacing member 13 b therebelow, and between the partition member 13 a and the spacing member 13 b thereabove, respectively.
  • FIG. 3-1 the direction of a flow of outdoor air is denoted by an arrow C in dash-single-dot line, and the direction of a flow of indoor air is denoted by an arrow D in dash-double-dot line.
  • FIG. 3-1 is a perspective view that schematically depicts the heat exchange element 13 A, and the number of layers of the partition members 13 a and the spacing members 13 b are different from the number of layers in a real heat exchange element 13 A.
  • FIG. 3-2 is a front view that schematically depicts the heat exchange element shown in FIG. 3-1 .
  • the heat exchange element 13 A have a pitch P and a height H of the air flow paths to be formed with the partition member 13 a and the spacing member 13 b thereabove or therebelow preliminarily selected.
  • heat exchange elements of a cross flow type each of which has different sensible heat exchange efficiency and different latent heat exchange efficiency from the others can be obtained.
  • the heat exchange element 13 B (see FIG. 2 ) has a configuration similar to the heat exchange element 13 A described above, and is a total heat exchange element of a cross flow type of which external dimensions are also substantially equal to the external dimensions of the heat exchange element 13 A; however, the pitch P and the height H described above are each different from the pitch P and the height H in the heat exchange element 13 A, the sensible heat exchange efficiency in the heat exchange element 13 B is lower than the sensible heat exchange efficiency in the heat exchange element 13 A, and the latent heat exchange efficiency in the heat exchange element 13 B is higher than the latent heat exchange efficiency in the heat exchange element 13 A.
  • the heat exchange ventilator 50 A (see FIG.
  • the sensible heat exchange efficiency of the heat exchange element 13 A arranged on the most outdoor side is higher than the sensible heat exchange efficiency of the heat exchange element 13 B arranged on the indoor side adjacent to the heat exchange element 13 A
  • the latent heat exchange efficiency of the heat exchange element 13 A arranged on the most outdoor side is lower than the latent heat exchange efficiency of the heat exchange element 13 B arranged on the indoor side adjacent to the heat exchange element 13 A.
  • the heat exchange ventilator 50 A in which the heat exchange element 13 A and the heat exchange element 13 B described above are arranged in series performs heat exchange with two of the heat exchange elements 13 A and 13 B, thereby being capable to obtain higher heat exchange efficiency than in a case of performing heat exchange only with a single heat exchange element. For this reason, even if reducing a height dimension to smaller than that of a heat exchange ventilator performing heat exchange only with a single heat exchange element, heat exchange efficiency equal to that of the heat exchange ventilator only with the single heat exchange element can be obtained.
  • the sensible heat exchange efficiency is higher in the heat exchange element 13 A on the outdoor side than in the heat exchange element 13 B on the indoor side, compared with a case of using two heat exchange elements having the same sensible heat exchange efficiency, the temperature of indoor air flowing into the heat exchange element 13 A becomes higher, consequently, the temperature of the heat exchange element 13 A is also higher. For this reason, during heat exchange with outdoor air, condensation and frost are difficult to be produced on the heat exchange element 13 A, and condensation and frost are more difficult be produced on the heat exchange element 13 B that is on a further outdoor side than the heat exchange element 13 A.
  • the latent heat exchange efficiency is higher in the heat exchange element 13 B on the indoor side than in the heat exchange element 13 A on the outdoor side, collection of latent heat is performed by the heat exchange element 13 B more positively than in a case of using two heat exchange elements having the same latent heat exchange efficiency, and the humidity of indoor air flowing into the heat exchange element 13 A becomes lower. From this point, condensation and frost are difficult to be produced on the heat exchange element 13 A during heat exchange with outdoor air.
  • the heat exchange ventilator 50 A can easily improve the heat exchange efficiency of the heat exchange element 13 A by reducing its air duct diameter, and easily achieve prevention of condensation and frost on each of the heat exchange elements 13 A and 13 B while limiting the height dimension of the equipment. A thin and reliable one of the heat exchange ventilator 50 A can be easily obtained.
  • an interval of defrost operations can be long.
  • energy collection from exhaust air (indoor air) cannot be substantially performed, and an exhaust air (outdoor air) temperature blown out indoors is the one after ice deposited on the heat exchange element is melted, which is lower than the temperature of indoor air without exception, consequently, a load in a ventilation operation performed afterwards is increased, and energy is consumed more.
  • an extension of an interval of defrost operations can bring about increase in energy collection rate, and reduction in ventilation load.
  • a technical effect is expected that the defrost function or a drain pan as a countermeasure against condensation can be omitted.
  • the heat exchange efficiency in a heat exchange element can be controlled by changing a volume and or a heat-transfer area of the heat exchange element.
  • the latent heat exchange efficiency can be controlled with materials of the heat exchange element, and a quantity and a type of a moisture absorbent to be contained.
  • the heat exchange efficiency of each of individual heat exchange elements can be controlled by controlling the volume and/or the heat-transfer area of the heat exchange element, or the quantity and the type of the moisture absorbent to be contained in the heat exchange element.
  • FIG. 4 is a vertical cross-sectional view that schematically depicts an example of a heat exchange ventilator of which a plurality of individual heat exchange elements is adjusted by changing the volume and the heat-transfer area of each of the heat exchange elements.
  • component members shown in FIG. 4 component members that have the functions in common with those shown in FIG. 1 are assigned with the same reference numerals as those used in FIG. 1 , except each of heat exchange units 15 C and 15 D.
  • a heat exchange ventilator 50 B shown in the figure includes two heat exchange units 15 C and 15 D.
  • a heat exchange element (not shown FIG. 4 ) included in the heat exchange unit 15 C is larger than a heat exchange element (not shown in FIG. 4 ) included in the heat exchange unit 15 D; its sensible heat exchange efficiency is higher than the sensible heat exchange efficiency of the heat exchange element in the heat exchange unit 15 D; and its latent heat exchange efficiency is lower than the latent heat exchange efficiency of the heat exchange element included in the heat exchange unit 15 D.
  • the heat exchange ventilator 50 B constructed by combining these heat exchange elements has technical effects similar to the heat exchange ventilator 50 A explained above in the first embodiment.
  • the heat exchange ventilator according to the present invention can be any in which a plurality of heat exchange elements arranged in series from the outdoor side to the indoor side is included; and the sensible heat exchange efficiency of a heat exchange element arranged on the most outdoor side is higher than the sensible heat exchange efficiency of a heat exchange element arranged on the indoor side adjacent to the heat exchange element arranged on the most outdoor side, or the latent heat exchange efficiency of the heat exchange element arranged on the most outdoor side is lower than the latent heat exchange efficiency of the heat exchange element arranged on the indoor side adjacent to the heat exchange element arranged on the most outdoor side.
  • the heat exchange element arranged on the most outdoor side can be one that has a higher sensible heat exchange efficiency and a lower latent heat exchange efficiency than those of the heat exchange element arranged on the indoor side adjacent to the heat exchange element arranged on the most outdoor side.
  • heat exchange elements to be combined and used are appropriately selected in accordance with heat exchange characteristics required for the heat exchange ventilator. It can be a combination of only total heat exchange elements that perform both heat exchange of sensible heat and heat exchange of latent heat; it can be a combination of only sensible heat exchange elements that perform only heat exchange of sensible heat; or it can be a combination of total heat exchange elements and sensible heat exchange elements.
  • a heat exchange element of not only a cross flow type, but also counter flow type can be used.
  • the heat exchange efficiency in a heat exchange element can be controlled by appropriately selecting the pitch P and the height H (see FIG. 3-2 ) of an air duct in the heat exchange element; or can be controlled by changing the volume and the heat-transfer area of the heat exchange element.
  • the latent heat exchange efficiency can be controlled with materials to be the heat exchange element, and the quantity and the type of a moisture absorbent to be contained.
  • the heat exchange efficiency can be controlled with the shape of each air duct in the heat exchange element.
  • FIG. 5-1 is a perspective view that schematically depicts an example of a heat exchange element that includes an air duct having a rectangular cross section; and FIG. 5-2 is a front view that schematically depicts the heat exchange element shown in FIG. 5-1 .
  • a heat exchange element 113 shown the figures is configured such that a plurality of spacing members 113 b shaped in flat plate standing on each one of partition members 113 a forms one unit, and a plurality of units is layered; and a top plate 113 c in the same configuration as the partition member 113 a is layered on the top of the units.
  • the former is arranged on the indoor side, and the latter is arranged on the outdoor side.
  • the heat exchange ventilator according to the present invention can include a bypass air duct for performing ventilation without passing through the heat exchange element, for example in spring or autumn when temperature and humidity differences between indoors and outdoors are small, and an air-duct switching device that controls an opening and a closing of the bypass air duct.
  • an air-duct switching unit to be used for performing a defrost operation, a filter to be used for air cleaning, or the like can be included.
  • various modifications, decorations, and combinations can be applied to the heat exchange ventilator according to the present invention. The present invention is explained below in more detail with reference to examples.
  • a non-porous hydrophilic polymer thin film was produced by thinly coating a polyurethane resin containing an oxyethylene group on a surface of a porous sheet of 25 ⁇ m in thickness made from polytetrafluoroethylene; and then a compound moisture penetration film that air-permeable nonwoven fabric was adhered by spot gluing on the back surface of the hydrophilic polymer thin film was used; so that partition members in a total heat exchange element to be arranged on the outdoor side were manufactured. Spacing members were manufactured by using a sheet of approximately 100 ⁇ m in thickness that pulp and fiber of a polyethylene resin were mixed. The pitch P of an air duct in the total heat exchange element was approximately 4.3 mm, and the height H (see FIG. 3-2 ) was approximately 1.8 mm.
  • the total heat exchange element is hereinafter referred to as an “element I-A”.
  • Partition members in a total heat exchange element to be arranged on the indoor side were manufactured from specially-processed paper having a basis weight 20 g/m 2 added with a moisture absorbent processed by beating cellulose fiber (pulp) to have 200 seconds/100 cm 3 or more of the Gurley air permeability as a single partition member; and spacing members were manufactured from flame-retardant paper having a basis weight 70 g/m 2 .
  • the pitch P of an air duct in the total heat exchange element was approximately 6.0 mm, and the height H was approximately 2.4 mm.
  • the total heat exchange element is hereinafter referred to as an “element II-B”.
  • Sizes and shapes of the partition members and the spacing members in a plan view were made to be the same between the element I-A and the element II-B; and a total number of layers of the partition members and the spacing members in each of the element I-A and the element II-B was controlled such that respective heights of the element I-A and the element II-B were to be equal.
  • a total heat exchange element having the same configuration as the element I-A explained in Example 1 except that the pitch P of a flow route of an air flow was approximately 6.0 mm and the height H was approximately 2.4 mm (hereinafter, the total heat exchange element is referred to as an “element I-B”) was manufactured and arranged on the outdoor side, and the others were made similar to Example 1; so that a heat exchange ventilator was obtained.
  • a heat exchange ventilator was obtained by manufacturing the element I-B explained in Example 2 and arranging it on the indoor side, and leaving the others similar to Example 1.
  • Example 2 By using the element I-B explained in Example 2, a heat exchange ventilator configured similarly to the heat exchange ventilator 50 A shown in FIG. 1 except to include only the element I-B as a heat exchange element was obtained. The size of each of horizontal partitions and each of vertical partitions in the housing was appropriately adjusted not to produce gap between a partition and a heat exchange unit.
  • a heat exchange ventilator was obtained similarly to Example 2, except by using the element I-B also as a heat exchange element on the indoor side.
  • a heat exchange ventilator was obtained similarly to Example 1, except by using the element I-A also as a heat exchange element on the indoor side.
  • the average pressure-loss increase-speed ratio is a ratio where an average pressure-loss increase-speed in the heat exchange ventilator of Reference Example 2 is assumed at “1”.
  • Letter “T” in the expression denotes an elapse time from when the pressure loss PD 1 is measured until when the pressure loss PD 2 is measured.
  • FIG. 6 An example of respective measurement results of variations with time in before-and-after differential pressure in a heat exchange element on which condensation and frost is controlled, and variations with time in before-and-after differential pressure in a heat exchange element on which condensation and frost is in progress, is shown in FIG. 6 .
  • Respective measurement results of a total heat exchange efficiency and an average pressure-loss increase-speed ratio obtained with respect to each of the heat exchange ventilators described above are shown in FIG. 7 .
  • the heat exchange ventilators according to the present invention are preferable as a heat exchange ventilator for household use and a heat exchange ventilator for commercial use, and particularly suitable as a heat exchange ventilator to be used in a cold district.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
US12/936,806 2008-04-16 2008-04-16 Heat exchange ventilator Abandoned US20110036541A1 (en)

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US20170045257A1 (en) * 2015-08-14 2017-02-16 Trane International Inc. Heat exchange assembly in an air to air heat exchanger
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US20220120460A1 (en) * 2019-12-19 2022-04-21 Panotec Co., Ltd. Smart air conditioner for reduction in fine dust and harmful gas
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US8899309B2 (en) 2010-12-20 2014-12-02 Daikin Industries, Ltd. Ventilation device
US20130059523A1 (en) * 2011-09-01 2013-03-07 Jeongtae RYU Ventilation apparatus
US9410716B2 (en) * 2011-09-01 2016-08-09 Lg Electronics Inc. Ventilation apparatus
US11035586B2 (en) 2012-02-02 2021-06-15 Carrier Corporation Energy recovery ventilator
US10222085B2 (en) 2012-02-29 2019-03-05 Carrier Corporation Energy recovery ventilator with reduced power consumption
US11378300B2 (en) 2012-02-29 2022-07-05 Carrier Corporation Energy recovery ventilator with reduced power consumption
US20130288591A1 (en) * 2012-04-27 2013-10-31 Hon Hai Precision Industry Co., Ltd. Heat dissipating device
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US10527367B2 (en) * 2015-08-14 2020-01-07 Trane International Inc. Heat exchange assembly in an air to air heat exchanger
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US20190234652A1 (en) * 2017-04-10 2019-08-01 Shinwa Controls Co., Ltd Air conditioning system
US11287147B2 (en) * 2018-06-19 2022-03-29 Nhn Corporation Air handling system and method
WO2020060102A1 (ko) * 2018-09-18 2020-03-26 주식회사 아모그린텍 환기장치용 열교환 유닛
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US20220120460A1 (en) * 2019-12-19 2022-04-21 Panotec Co., Ltd. Smart air conditioner for reduction in fine dust and harmful gas
US12085294B2 (en) * 2019-12-19 2024-09-10 Panotec Co., Ltd. Smart air conditioner for reduction in fine dust and harmful gas
US20220381454A1 (en) * 2021-05-31 2022-12-01 Huawei Digital Power Technologies Co., Ltd. Evaporative cooling unit and data center
EP4098953A1 (en) * 2021-05-31 2022-12-07 Huawei Digital Power Technologies Co., Ltd. Evaporative cooling unit and data center
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US20230304680A1 (en) * 2022-03-28 2023-09-28 Therma-Stor LLC Energy recovery ventilation unit with a dehumidification system

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EP2275751A1 (en) 2011-01-19
CN102007346B (zh) 2014-02-26
JP5220102B2 (ja) 2013-06-26
WO2009128150A1 (ja) 2009-10-22
KR20100120313A (ko) 2010-11-15
CN102007346A (zh) 2011-04-06
JPWO2009128150A1 (ja) 2011-08-04

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