EP4296602A1 - Échangeur de chaleur à plaques et ensemble hydraulique comprenant un tel échangeur de chaleur - Google Patents

Échangeur de chaleur à plaques et ensemble hydraulique comprenant un tel échangeur de chaleur Download PDF

Info

Publication number
EP4296602A1
EP4296602A1 EP23179759.8A EP23179759A EP4296602A1 EP 4296602 A1 EP4296602 A1 EP 4296602A1 EP 23179759 A EP23179759 A EP 23179759A EP 4296602 A1 EP4296602 A1 EP 4296602A1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
fluid
ports
inlet
primary
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23179759.8A
Other languages
German (de)
English (en)
Inventor
Marco Rapaccioli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
G20 Engineering Srl
Original Assignee
G20 Engineering Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by G20 Engineering Srl filed Critical G20 Engineering Srl
Publication of EP4296602A1 publication Critical patent/EP4296602A1/fr
Pending legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0031—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other
    • F28D9/0043—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another
    • F28D9/005—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another the plates having openings therein for both heat-exchange media
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B39/00—Evaporators; Condensers
    • F25B39/04—Condensers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2339/00—Details of evaporators; Details of condensers
    • F25B2339/04—Details of condensers
    • F25B2339/047—Water-cooled condensers

Definitions

  • the present invention refers to a plate heat exchanger and hydraulic assembly comprising such a heat exchanger.
  • the invention has been developed with particular regard to, but not limited to, a plate heat exchanger for use in a boiler for the instantaneous production of domestic hot water and/or heating, as well as for use in a heat pump.
  • a heat exchanger is provided with four ports: two are respectively for inlet and outlet of the hot water heated by the burner, called primary circuit water, and the other two ports are for inlet of sanitary cold water and outlet of sanitary hot water, heated by the heat exchanger and ready to be supplied.
  • a heat exchanger comprising a plurality of plates.
  • the plates can be fixed to each other to form first chambers and second chambers.
  • the first chambers are preferably hydraulically connected to each other to form a primary circuit.
  • the second chambers are preferably hydraulically connected to each other to form a secondary circuit.
  • the primary circuit is preferably hydraulically separated from the secondary circuit.
  • the heat exchanger preferably comprises at least two ports for inlet and outlet of a fluid from the primary circuit and at least two ports for inlet and outlet of a fluid from the secondary circuit.
  • each plate has an elongated shape, with two long sides and two tapered ends. Tapered means that the width of the plate is reduced when moving away from the centre of the plate itself. Such a geometry allows a better thermal performance with the same footprint.
  • each plate has an elongated shape, for example it may be approximately polygonal, with two long sides and at least four short sides, or it may have two long sides and two curved short sides, for example semi-circle or semi-ellipse.
  • the plates have corrugations, to increase the turbulence of the fluid flowing therein and therefore the performance.
  • the corrugations are successions of valleys and ridges, which can be arranged with a herringbone pattern, preferably with opposing direction between adjacent plates.
  • a four-way valve particularly suitable for use in a heat pump, comprising a pair of opposing plates, provided with a total of four ports, and a rotating plate interposed between them.
  • the rotating plate has two through-holes, shaped in such a way that, when the three plates are brought together and tightened, each through-hole of the rotating plate connects a pair of ports.
  • the through-holes are in the shape of a slot.
  • valve can be used for both water and for other coolants such as for example those typically used in a heat pump.
  • a circulation pump 12 is positioned at the outlet of the primary circuit, to cause the circulation of the primary fluid.
  • a three-way valve 14 is instead placed at the inlet of the primary circuit. The purpose of the three-way valve is to convey the hot fluid coming from a primary heat exchanger inside the heat exchanger, if there is a request for sanitary hot water. In the absence of a request for sanitary hot water, on the other hand, the hot fluid coming from the primary exchanger is conveyed towards the heating circuit.
  • a safety valve 18 ensures that the pressure of the system never exceeds a predetermined pressure, for example 3 or 6 bar.
  • a tap 20 instead allows a user to add water into the primary circuit to reach an operating pressure.
  • a plate heat exchanger 10 comprises a plurality of alternating plates 30a, 30b, placed next to each other and enclosed between a first end plate 32 and a second end plate 34, in opposing position with respect to the end plate 32.
  • the plates of the heat exchanger 10 are produced by moulding a sheet metal and are subsequently brought together.
  • the first end plate 32, the second end plate 34, and the plates 30a, 30b of the heat exchanger are permanently joined together to form a plate package.
  • the joining between the plates takes place by welding and more preferably by brazing, i.e. welding with material addition.
  • a particularly suitable brazing technology for the construction of the heat exchanger 10 is copper foil technology.
  • Each plate has an elongated shape, with two long approximately parallel sides 2.
  • each plate has an approximately polygonal shape, with two long sides and at least four short sides, like in the figures.
  • it is not excluded the possibility of providing a plate with two straight long sides 2 and two curved short sides, for example semi-circle or semi-ellipse or more generally two long sides 2 and two tapered ends 4.
  • each pair of facing plates 30a, 30b, 32, 34 defines between them a chamber 36, 38 for a fluid.
  • the chambers 36 are connected to each other to form the primary circuit 40 and the chambers 38 are connected to each other to form the secondary circuit 42.
  • the chambers 36 and 38 alternate such that each plate 30a, 30b serves as a dividing wall between the primary circuit 40 and the secondary circuit 42, thereby permitting a heat exchange between the primary fluid and the secondary fluid.
  • the heat exchanger 10 is provided with four ports 44, 46, 48, 50, visible in Figure 1a .
  • the ports 44 and 46 are for inlet and outlet of the fluid of the primary circuit, respectively, while the ports 48 and 50 are for outlet and inlet of the fluid of the secondary circuit, respectively.
  • the four ports are preferably arranged in line with each other, i.e. their axes all pass through a single straight or approximately straight line.
  • the four ports are preferably all positioned on the same side of the heat exchanger, for example on the side of the first plate 32.
  • the two ports 44, 46 of the primary circuit are positioned on the side of the first end plate 32 and the two ports 48, 50 of the secondary circuit are positioned on the side of the second end plate 34 (or vice versa).
  • the four ports are preferably arranged in line with each other, i.e. their axes all pass through a single straight or approximately straight line.
  • Figure 3 shows the course of the fluid within the primary circuit 40, in a chamber 36.
  • closed-profile shoulders 52 and 54 are provided, which when the heat exchanger is assembled are welded to the adjacent plate 30a, to separate the primary circuit from the secondary circuit.
  • the fluid enters from an inlet hole 65, near an end 4 of the heat exchanger.
  • the fluid is then directed towards the opposing end 4 of the heat exchanger, towards the outlet hole 63.
  • the arrows indicate the path that the fluid approximately travels in the chamber 36.
  • Figure 4 instead shows the course of the fluid within the secondary circuit 42, in a chamber 38.
  • shoulders 60 and 62 with closed-profile, are provided to separate the primary circuit from the secondary circuit and there is also provided a pair of shoulders 56, 58 with open profile, outlining a U.
  • the U-shaped shoulders 56, 58 are arranged so as to partially embrace the connection holes 64, 66 between adjacent chambers 38 and with the concavity facing outwards, more specifically towards the shoulders 60, 62.
  • the water enters from an inlet hole 66 is conveyed from the U-shaped shoulder 58 towards an end 4 of the heat exchanger, where the shoulder 62 is located.
  • the end 4 of the heat exchanger causes a reversal of the direction of the flow of the fluid, which is directed towards the opposing end 4 of the heat exchanger, where the shoulder 60 is located.
  • the fluid is then conveyed inside the U-shaped concavity of the shoulder 56 and then towards the outlet hole 64.
  • the shoulders 56, 58 may also have a different shape, for example V- or L-shaped. Overall it is sufficient that they direct the flow of the fluid towards an end 4 of the heat exchanger.
  • the thermal length i.e. the length along which the two fluids have a heat exchange
  • the thermal length is greater than the thermal length of a known heat exchanger.
  • the thermal length is less than the length of the heat exchanger, since there is no exchange near the primary and secondary fluid inlet and outlet ports.
  • the fluids flow side by side along the entire length of the heat exchanger.
  • Each plate has corrugations 70, understood as successions of valleys and ridges, clearly visible in the section of Figure 2 .
  • the corrugations are generally with a herringbone pattern, with opposing direction between the plates 30a and the plates 30b. In this way, two adjacent plates always have opposing corrugations.
  • the corrugations allow to create a series of tunnels, all communicating, for the fluid to pass in the chambers 36, 38. Compared to the use of smooth plates, it has been noted that plates with corrugations result in greater turbulence of the fluid and, therefore, a better heat exchange.
  • the fluids are predominantly countercurrent, i.e. the primary fluid and the secondary fluid are directed in the opposing direction. In this way the temperature difference between primary and secondary fluid is relatively constant, with reduced swings. However, there are short stretches in which the fluids are in phase, near the inlet 66 and outlet 64 holes.
  • the plates are preferably made of steel.
  • each plate is obtained by moulding from a metal sheet.
  • heat exchanger described above has a layout compatible with a standard DIN template.
  • FIG. 5 shows the summer mode operation diagram of a heat pump comprising a heat exchanger 10.
  • the fluid then passes through the four-way valve 90, which is now in a different configuration than it was in summer mode, to convey the fluid towards the compressor 92.
  • the compressor compresses the fluid, bringing it to a higher pressure and, consequently, to a temperature T5', higher than T3' and T4'.
  • the fluid exiting the compressor passes again in the four-way valve 90 and can thus return to the heat exchanger 10 to heat the fluid of the secondary circuit.
  • FIG. 7 shows in detail the hydraulic assembly 100 constituting the secondary circuit.
  • the hydraulic assembly 100 comprises a circulation pump 102, which pushes the fluid that passes through it towards a four-way valve 104.
  • the four-way valve 104 may be configured to send the fluid coming from the pump 102 towards the port 48 or the port 50 of the heat exchanger, of choice.
  • the ports 44 and 46 of the heat exchanger are intended to be connected to a closed primary circuit for a fluid of a heat pump, as described above.
  • the heat pump can be used in heating (winter) or cooling (summer) mode, by reversing the direction of the fluid in the primary circuit. Since, however, a heat exchanger operates more efficiently when primary and secondary fluid are in countercurrent, the four-way valve 104 allows to reverse the direction of the secondary fluid to adapt it to that of the primary circuit, defined by the mode of operation (heating or cooling). This results in a maximum efficiency of the heat pump.
  • FIG. 8 An exploded view of the four-way valve 90, 104 is shown in Figure 8 .
  • the valve comprises two opposing plates 110, 112.
  • the first plate 110 is provided with two ports 114, 116 and the second plate 112 with two ports 118, 120.
  • a rotating plate 122 is interposed between them and has two slotted through-holes 124 and 126.
  • the three plates are tightened together in use, such that each through-hole 124, 126 each connects a port of the first plate 110 and a port of the second plate 112.
  • By turning the rotating plate 122 it is possible to change the pairing of the ports, as better visible in the diagrams of Figures 9 and 10 .
  • the through-hole 124 connects the ports 116 and 118, while the through-hole 126 connects the ports 114 and 120.
  • a second configuration in which the rotating plate 122 is rotated by 90° with respect to the position in which it is in the first configuration, the through-hole 124 connects the ports 114 and 118, while the through-hole 126 connects the ports 116 and 120.
  • Seals 128 ensure tightness and thus allow the two circuits to be kept separated from each other.
  • ports can all be provided on one of the two plates 110, 112, the other being solid, without changing the functionality of the valve.
  • the four-way valve shown here can be sized for the passage of water or of a coolant and finds particular but not exclusive use in a hydraulic assembly 100 for heat pump such as the one depicted in Figure 7 , i.e. comprising a heat exchanger 10.
  • the hydraulic assembly 100 in turn finds particular but not exclusive use in a heat pump such as the one described above and illustrated in Figures 5 and 6 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
EP23179759.8A 2022-06-24 2023-06-16 Échangeur de chaleur à plaques et ensemble hydraulique comprenant un tel échangeur de chaleur Pending EP4296602A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT202200013423 2022-06-24

Publications (1)

Publication Number Publication Date
EP4296602A1 true EP4296602A1 (fr) 2023-12-27

Family

ID=83271432

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23179759.8A Pending EP4296602A1 (fr) 2022-06-24 2023-06-16 Échangeur de chaleur à plaques et ensemble hydraulique comprenant un tel échangeur de chaleur

Country Status (1)

Country Link
EP (1) EP4296602A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005078370A1 (fr) * 2004-02-10 2005-08-25 Pewo Energietechnik Gmbh Echangeur de chaleur a chambre contenant un milieu de mesure
EP1843116A2 (fr) * 2006-04-03 2007-10-10 Behr GmbH & Co. KG Échangeur de chaleur à plaques empilées
JP2013088044A (ja) * 2011-10-19 2013-05-13 Mitsubishi Electric Corp プレート熱交換器および給湯機
US20130292101A1 (en) * 2010-11-10 2013-11-07 Valeo Systemes Thermiques Fluid/Fluid Heat Exchanger
US20150184954A1 (en) * 2012-06-14 2015-07-02 Alfa Laval Corporate Ab Plate heat exchanger
US20200006822A1 (en) * 2016-02-03 2020-01-02 Modine Manufacturing Company Plate Assembly for Heat Exchanger
US20200408135A1 (en) * 2018-02-28 2020-12-31 Ufi Filters S.P.A. Oil temperature control assembly

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005078370A1 (fr) * 2004-02-10 2005-08-25 Pewo Energietechnik Gmbh Echangeur de chaleur a chambre contenant un milieu de mesure
EP1843116A2 (fr) * 2006-04-03 2007-10-10 Behr GmbH & Co. KG Échangeur de chaleur à plaques empilées
US20130292101A1 (en) * 2010-11-10 2013-11-07 Valeo Systemes Thermiques Fluid/Fluid Heat Exchanger
JP2013088044A (ja) * 2011-10-19 2013-05-13 Mitsubishi Electric Corp プレート熱交換器および給湯機
US20150184954A1 (en) * 2012-06-14 2015-07-02 Alfa Laval Corporate Ab Plate heat exchanger
US20200006822A1 (en) * 2016-02-03 2020-01-02 Modine Manufacturing Company Plate Assembly for Heat Exchanger
US20200408135A1 (en) * 2018-02-28 2020-12-31 Ufi Filters S.P.A. Oil temperature control assembly

Similar Documents

Publication Publication Date Title
US11519673B2 (en) Plate heat exchanger and heat pump device including the same
CN108603732B (zh) 板式热交换器及具备板式热交换器的热泵式制热供热水系统
EP3217135B1 (fr) Collecteur stratifié, échangeur de chaleur et appareil de climatisation
JP6305574B2 (ja) プレート熱交換器及びヒートポンプ式室外機
US20190226771A1 (en) Heat exchanging plate and heat exchanger
CN106642792B (zh) 喷气增焓空调机组
JP5819592B2 (ja) プレート式熱交換器及びヒートポンプ装置
JP2018096636A (ja) 熱交換器およびそれを用いた冷凍システム
JP6108332B2 (ja) 空気調和機
JP2019152367A (ja) 熱交換器ユニットおよびそれを用いた空気調和機
EP3071897A1 (fr) Échangeur thermique à plaques, en particulier pour chaudières à condensation
EP2982924A1 (fr) Échangeur de chaleur
EP4296602A1 (fr) Échangeur de chaleur à plaques et ensemble hydraulique comprenant un tel échangeur de chaleur
JP5661205B2 (ja) 積層型熱交換器及びそれを搭載したヒートポンプシステム、並びに積層型熱交換器の製造方法
JP6177459B1 (ja) プレート式熱交換器および冷凍サイクル装置
CN105466114A (zh) 空调系统
JP5046748B2 (ja) 給湯システムのガスクーラ
WO2000016029A1 (fr) Echangeur de chaleur et systeme de conditionnement d'air refrigerant
JP5171280B2 (ja) 熱交換器及びそれを用いたヒートポンプ式給湯機
JP2006317094A (ja) 熱交換器
ES1306838U (es) Válvula de cuatro vías
CN208620665U (zh) 一种新型间壁式微型换热器
JPH10300260A (ja) 吸収冷温水機
EP4060239A1 (fr) Echangeur de chaleur a plaques, systeme de chauffage urbain, et procede de transfert de la chaleur urbaine a l'eau domestique
JP2000180076A (ja) 水・冷媒熱交換器

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR