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
  • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
  • F28D7/0066—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids
• • 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
  • F25B39/02—Evaporators
• • 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
  • F25B40/00—Subcoolers, desuperheaters or superheaters
  • F25B40/06—Superheaters
• • 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
  • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
  • F28D21/0017—Flooded core heat exchangers
• • 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
  • F25B2339/02—Details of evaporators
  • F25B2339/024—Evaporators with refrigerant in a vessel in which is situated a heat exchanger
  • F25B2339/0242—Evaporators with refrigerant in a vessel in which is situated a heat exchanger having tubular elements
• • 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
  • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
  • F25D2500/00—Problems to be solved
  • F25D2500/02—Geometry problems
• • 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
  • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
  • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation

Definitions

• the invention concerns an improved heat exchanger with tube bundle.
• the heat exchanger that is the subject of the invention is of the so-called "flooded" type and is used as an evaporator in refrigerating and/or air conditioning systems.
• a heat exchanger of the "flooded" type is constituted by a container body developing in a mainly longitudinal direction, in which a tube bundle is arranged, The latter is supported at each end by a tube plate that in turn is fixed to the container body.
• Each tube plate is provided with a cover that is applied thereto in such a way as to define two opposing heads, in each one of which a manifold chamber communicating with the tube bundle is defined.
• the container body thus contains a heat exchange chamber delimited by the tube plates and the outer surface of the tube bundle, said chamber communicating with the outside via an inlet mouth and an outlet mouth, both created in the container body.
• Heat exchangers of the type described above are used as evaporators in refrigerating and/or air conditioning systems in order to evaporate the refrigerant fluid that comes from the condenser, through heat exchange with another liquid, usually water.
• the refrigerant fluid coming from the condenser is introduced in the heat exchange chamber through the inlet mouth, absorbs heat via heat exchange with the hot water that flows along the tube bundle and flows out of the outlet mouth in the form of saturated vapour.
• the temperature of the water decreases during the heat exchange and when it flows out of the tube bundle the water can be used for refrigerating purposes.
• the refrigerant fluid in the form of saturated vapour must be properly superheated in order to eliminate any liquid that is still present therein and that would damage the compressor.
• the superheating of the refrigerant fluid in the form of saturated vapour is carried out by means of superheating units with tube bundle or analogous units in which the saturated vapour to be superheated is circulated preferably countercurrent with respect to a warmer fluid, constituted for example by the same refrigerant fluid in the liquid state flowing out of the condenser.
• a first drawback lies in that the evaporator and the superheater are separated and to connect them with each other it is necessary to use pipes and fittings, which means a marked increase in the cost of the system.
• a further drawback is represented by the inevitable thermodynamic losses along the pipes, which entail a reduced enthalpy difference to be exploited and therefore a lower coefficient of performance that is commonly indicated by the acronym COP.
• the present invention aims to overcome the drawbacks listed above.
• the heat exchanger of the invention comprises:
• - a superheating unit associated with the first container body and comprising a second container body that contains a second tube bundle.
• the tube plates that support each end of the tube bundles of the heat exchanger and of the superheater are carried out in a single flange.
• the heat exchanger that is the subject of the invention is simpler and more compact than equivalent heat exchangers constructed according to the known art.
• the increased compactness of the heat exchanger makes it simpler to construct than equivalent heat exchangers of known type.
• the absence of connection pipes between the heat exchanger and the superheater simplifies maintenance and also makes operation safer.
• FIG. 2 shows the cross section of the heat exchanger shown in Figure 1, carried out along plane H-Il;
• FIG. 3 shows a side view of a construction variant of the heat exchanger that is the subject of the invention
• FIG. 4 shows more heat exchangers carried out according to the variant shown in Figure 3 and connected in series.
• the heat exchanger that is the subject of the invention is represented in a longitudinal view in Figure 1 and in cross section along plane H-Il in Figure 2, and is indicated as a whole by 1. It can be observed that it contains a first container body 2, developing mainly in a longitudinal direction, inside which there is a first tube bundle indicated as a whole by 3, constituted by a plurality of tubes parallel to one another that substantially run along the entire length of the first container body 2. Two tube plates 4, 5, each fixed to one end of the first container body 2, support the first tube bundle 3 at the level of its ends.
• the heat exchanger 1 comprises a superheating unit 20 of said second fluid, associated with said first container body 2.
• the superheating unit 20 is of the type with tube bundle and comprises a second container body 22 that develops in a substantially longitudinal direction, inside which there is a second tube bundle 23 consisting of a plurality of tubes parallel to one another that substantially run along the entire length of the second container body 22.
• An inlet way 30 created in the cover 26 and an outlet way 31 created in the cover 27 allow the flow through the second tube bundle 23 according to the direction and sense indicated by the arrow C.
• both the tube plates 4, 24; 5, 25 arranged on the same side of each tube bundle 3, 23 are obtained in a single flange 34, 35.
• the heat exchanger 1 of the invention is used, for example, as evaporator-superheater in refrigerating and/or air conditioning systems comprising, among other things, at least one compressor and at least one condenser, none of which is represented herein.
• the first heat exchange fluid constituted by hot water, flows into the inlet head 8 through the inlet way 10 created in the cover 6 of the first container body 2 and then from the inlet manifold chamber 8a it runs through the first tube bundle 3 according to the direction indicated by the arrow A until reaching the outlet head 9 and then the outlet chamber 9a and flow out through the outlet way 11.
• a second fluid constituted for example by the hot refrigerant fluid flowing out of the condenser of the refrigerating or air conditioning system, flows through the inlet way 30 present in the cover 26 of the superheating unit 20 and runs through the second tube bundle 23 according to the direction and sense indicated by the arrow B, until reaching the outlet way 31.
• the outlet way 31 communicates with the inlet mouth 12 present in the second container body 2 and thus the second fluid that flows out of the outlet way 31 enters the evaporation chamber 2a.
• the pressure inside the evaporation chamber 2a and the temperature of the hot water that circulates in the first tube bundle 3 are such as to create the conditions necessary to allow the second fluid passing through the inlet mouth 12 to evaporate due to the heat exchange with the hot water that flows in the first tube bundle 3.
• the hot water that flows in the first tube bundle 3 cools down and flows out through the outlet way 11 at a temperature that is lower than it was at the level of the inlet way 10.
• Said refrigerated water can thus be reused, for example inside a cabinet or an exchange coil for refrigeration.
• the second fluid that is now present in the evaporation chamber 2a in the form of saturated vapour flows through the intake ways 32 and into the superheating chamber 22a, where it comes into contact with the second tube bundle 23 in which, as already said, there is the refrigerant fluid coming from the outlet of the condenser, whose temperature is higher than it was when it entered the evaporation chamber 2a passing through the inlet mouth 12.
• the second hotter fluid that circulates in the second tube bundle 23 cools down and flows out through the outlet way 31 to flow back into the evaporation chamber 2a passing through the inlet mouth 12.
• the second cooler fluid present in the superheating chamber 22a superheats and thus when it flows out of the outlet mouth 33, it can be conveyed to the suction port of the compressor.
• the temperature of the first fluid which in this specific case is water, at the level of the inlet way 10 of the first tube bundle 3 is higher than it is at the level of the outlet way 11 of the same first tube bundle 3, since in the evaporation chamber 2a it transfers heat to the refrigerant fluid in the form of saturated vapour.
• the heat exchanger of the invention as an evaporator, it is possible to superheat the refrigerant fluid that flows in through the inlet mouth 12 thanks to the heat exchange with the hot water that flows in through the inlet way 10 and flows out, cool, through the outlet way 11, and with the hot refrigerant fluid coming from the condenser that flows in through the inlet way 30 and flows out, cool, through the outlet way 31.
• the heat exchanger that is the subject of the invention achieves all the set objects. In particular, since it is not necessary to proceed to the laying and connection of pipes and fittings for the connection of the superheating unit, the operation is more economic compared to the known art.
• the same heat exchanger can be provided with superheating unit or not.
• Figure 3 where it is indicated as a whole by 40 and differs from the variant described above owing to the different arrangement of the inlet and outlet ways, respectively 41 and 42, of the second tube bundle 43 that makes up the superheating unit 44.
• inlet and outlet ways 41 and 42 communicate with the inlet and outlet heads, respectively 45 and 46, belonging to the second container body 47 that contains the second tube bundle 43 through tubular bends, respectively inlet 48 and outlet 49 bends, which project from the periphery of the first container body 50.
• FIG. 4 shows two heat exchangers 40 that are connected in series by flanging them at the level of two adjacent tube plates 51, 52, after removal of the inlet and outlet heads 53, 54 and of the covers 55, 56 of the first tube bundle 57.

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)

Applications Claiming Priority (2)

Publications (1)

Family

ID=40090101

Family Applications (1)

Country Status (4)

Families Citing this family (19)

Family Cites Families (12)

• 2007
  • 2007-07-03 IT IT000187A patent/ITVI20070187A1/it unknown
• 2008
  • 2008-05-29 WO PCT/IB2008/001371 patent/WO2009004422A2/en active Application Filing
  • 2008-05-29 EP EP08762740A patent/EP2160544A2/de not_active Withdrawn
  • 2008-05-29 US US12/529,330 patent/US20100132927A1/en not_active Abandoned

Non-Patent Citations (1)

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