WO2018146705A1 - Compression refrigerating system equipped with micro-channel evaporator - Google Patents

Compression refrigerating system equipped with micro-channel evaporator Download PDF

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Publication number
WO2018146705A1
WO2018146705A1 PCT/IT2018/000007 IT2018000007W WO2018146705A1 WO 2018146705 A1 WO2018146705 A1 WO 2018146705A1 IT 2018000007 W IT2018000007 W IT 2018000007W WO 2018146705 A1 WO2018146705 A1 WO 2018146705A1
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WO
WIPO (PCT)
Prior art keywords
refrigerating system
micro
manifolds
channel
evaporator
Prior art date
Application number
PCT/IT2018/000007
Other languages
French (fr)
Inventor
Davide MONTINA
Gian Piero CARNIELETTO
Alessandro ROMUSSI
Original Assignee
Pastorfrigor S.P.A.
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 Pastorfrigor S.P.A. filed Critical Pastorfrigor S.P.A.
Publication of WO2018146705A1 publication Critical patent/WO2018146705A1/en

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Classifications

    • 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
    • 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
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/0233—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with air flow channels
    • F28D1/024—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with air flow channels with an air driving element
    • 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
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
    • F28D1/0535—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight the conduits having a non-circular cross-section
    • F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
    • F28D1/05391—Assemblies of conduits connected to common headers, e.g. core type radiators with multiple rows of conduits or with multi-channel conduits combined with a particular flow pattern, e.g. multi-row multi-stage radiators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/126—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element consisting of zig-zag shaped fins
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/12—Inflammable refrigerants
    • 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
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0068—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for refrigerant cycles
    • F28D2021/0071—Evaporators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
    • F28F2250/08—Fluid driving means, e.g. pumps, fans

Definitions

  • the present invention refers to a compression refrigerating system equipped with micro-channel evaporator, which is applied in the commercial refrigeration sector.
  • Compression refrigerating systems of this type are used to recreate, inside a defined space, suitable temperature conditions for storing food products.
  • This type of apparatus, within the commercial refrigeration, is called refrigerated cabinet .
  • Refrigerated cabinets with different types and configurations are known, having in common the same basic concept: the environment to be refrigerates is circumscribed inside an insulated structure (assembled panels or shell) .
  • the refrigeration effect is guaranteed by the compression refrigerating system composed of some major components: a heat exchanger, called evaporator, which is placed inside the spaces to be refrigerated, a laminating member which regulates the inflow of the refrigerating fluid inside the evaporator and a condensing unit, which can be embedded inside the refrigerated cabinet or remote.
  • CN-U-205037628 discloses a micro-channel "frostless" heat exchanger. It comprises an inlet tube, an outlet tube, a support for installation and a heat exchanger core of the multi-layered type. Every layer of the core includes a flat micro-channel tube and "U"-shaped wings. At the ends of the heat exchanger, there are two side reinforcing plates.
  • This micro-channel heat exchanger has a compact structure and can be convenient in application requiring high thermal exchange efficiencies.
  • Object of the present invention is providing a refrigerating system which allows improving the previously known techniques, both regarding the traditional design of refrigerated cabinets, and in design and use of micro-channel evaporators, in order to allow:
  • FIG. 1 is a schematic view of a first preferred embodiment of an open vertical refrigerated cabinet, adapted to be closed with doors, according to the present invention
  • FIG. 2 is an exploded schematic view of a preferred embodiment of the compression refrigerating system according to the present invention
  • FIG. 3 is a schematic view of the refrigerated cabinet of Figure 1 without part of its external structure;
  • - Figure 4 is a perspective view of the micro- channel evaporator of the present invention;
  • FIG. 5 is a top view of the micro-channel evaporator of Figure 4.
  • FIG. 6 is a side view of the micro-channel evaporator of Figure .
  • the compression refrigerating system for commercial use of the present invention comprises:
  • a vertical refrigerated cabinet (2) comprising spaces (4) necessary for circulating air;
  • an insulated body (1) composed of foamed panels and placed around the vertical cabinet (2) ;
  • the inlet (16) of the evaporator (8) is placed on the manifold (13) of the second rank, while the outlet (17) is placed on the manifold (11) of the first rank.
  • the pitch between the flat micro-channel tubes (15) is preferably equal to about 10 mm.
  • a flat micro-channel tube (15) and the following a series of "V"- shaped aluminum wings (18) are placed, with a pitch of about 17.5 mm.
  • the wings (18) on the two ranks are mutually offset by 180°.
  • the above refrigerating system can also comprise at least one condensing unit equipped with refrigerating fluid with hydrocarbons; the condensing unit is composed of the following major components: a compressor (5) and a condenser (6) mutually connected with airtight tubes.
  • the compressor (5) can be of the alternative airtight type (commonly called "piston type") or alternative airtight with variable speed with inverter.
  • the condenser (6) is of the type with aluminum micro- channels according to exclusive design geometries: of the single-rank type, it is composed of two manifolds (not shown) mutually connected by twenty- two flat micro-channel tubes (not shown) arranged perpendicular with respect to the manifolds themselves.
  • Inlet and outlet of the condenser are placed on the same manifold. Inside the manifolds dividing partitions are inserted, which create a total of four passages.
  • the pitch between the flat micro-channel tubes is preferably equal to about 10 mm. Between a flat micro-channel tube and the following one, there are a series of "V"-shaped aluminum wings (not shown) with a pitch of about 3.2 mm.
  • the refrigerating system of the invention can further comprise at least one laminating member (7) which mutually connects the condensing unit with compressor (5) and condenser (6) and the micro- channel evaporator (8): such laminating member (7) can be with capillary, with mechanic or electronic thermostatic valve.
  • Such compression refrigerating system allows a refrigerated cabinet (2) with an embedded or remote assemble, to have a very low impact both in energy and in environmental terms.
  • propane gas R290
  • refrigerating fluid of the refrigerating circuit preferably, but not exclusively, propane gas, R290, is used: it is a natural refrigerating gas, efficient and with a zero environmental impact, which satisfies all requirements of EU Regulations n. 517/2014 of the European Parliament and Council.
  • EN 378 and IEC 60335-2-89 Standards disclose the safety standards which must be observed by the apparatuses which use hydrocarbons as refrigerating gas, specifically the propane R290.
  • the refrigerating system of the present invention adopts technical innovative solutions, which allow satisfying all safety requirements, without in any way impairing the functional performances of the machine .
  • purpose of the present invention is providing a vertical refrigerated cabinet (2) with doors having a length greater than 2000 mm which, with a single circuit charged with less than 150 grams of propane gas (R290), is capable of keeping the exhibited product within the temperature classes (both positive and negative) described in the EN ISO 23953-2 Standard.
  • propane gas R290 propene gas R1270, isobutane gas R600a or other hydrocarbon gases can be used.
  • such gas performs two state passages: the first inside the evaporator (8) in which the refrigerating element gas passes from its liquid state to its gaseous state (the necessary energy for the state passages is taken from the surrounding air which in this way cools down) , the second inside the condenser (6) in which the refrigerating element passes from its gaseous state to its liquid state (the necessary energy for the state passages is taken by the surrounding air, which in this way heats up) .
  • the component which allows the refrigerating element to circulate inside the system is the compressor (5) , assembled on the condensing unit: its function is sucking gas exiting from the evaporator (8) and compress it towards the condenser (6) increasing both its pressure and its temperature.
  • the fourth component of the system is the laminating member (7), which is placed between the condenser (6) and the evaporator (8): by means of a bottleneck of the system, it has the function of lowering both the pressure and the temperature of the refrigerating element coming from the condenser (6). It is also the component which controls the refrigerating flow which goes back into the evaporator (8) to repeat the above described cycle.
  • a forced air circulation is applied with the help of fans (9).
  • the air circulation can also be natural, namely without the use of fans.
  • the described apparatus is managed by an electronic thermostat (10) which, by means of some probes, detects the system temperature and manages its operation.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Abstract

A compression refrigerating system for commercial use is described, comprising: a vertical refrigerated cabinet (2) comprising spaces (4) necessary for circulating air; an insulated body (1) composed of foamed panels and placed around al vertical cabinet (2); a series of sheet metals (3) placed inside the refrigerated cabinet (2), which are a structure for the refrigerated cabinet (2), to provide the areas where the food products to be exhibited are placed; and at least one micro- channel aluminum evaporator (8) placed inside the refrigerated cabinet (2).

Description

COMPRESSION REFRIGERATING SYSTEM EQUIPPED WITH MICRO-CHANNEL EVAPORATOR
The present invention refers to a compression refrigerating system equipped with micro-channel evaporator, which is applied in the commercial refrigeration sector.
Compression refrigerating systems of this type are used to recreate, inside a defined space, suitable temperature conditions for storing food products. This type of apparatus, within the commercial refrigeration, is called refrigerated cabinet .
Refrigerated cabinets with different types and configurations are known, having in common the same basic concept: the environment to be refrigerates is circumscribed inside an insulated structure (assembled panels or shell) . The refrigeration effect is guaranteed by the compression refrigerating system composed of some major components: a heat exchanger, called evaporator, which is placed inside the spaces to be refrigerated, a laminating member which regulates the inflow of the refrigerating fluid inside the evaporator and a condensing unit, which can be embedded inside the refrigerated cabinet or remote.
There are also patents which disclose various types of micro-channel evaporator, which are different as regards sizes, geometries and/or fields of application. Among them, it is possible to find CN-U-205037628, which discloses a micro- channel "frostless" heat exchanger. It comprises an inlet tube, an outlet tube, a support for installation and a heat exchanger core of the multi-layered type. Every layer of the core includes a flat micro-channel tube and "U"-shaped wings. At the ends of the heat exchanger, there are two side reinforcing plates. This micro-channel heat exchanger has a compact structure and can be convenient in application requiring high thermal exchange efficiencies.
The above described known technologies, both the traditional refrigerated cabinet and the micro- channel evaporators, have aspects whose improvement is the object of the present invention:
- all refrigerated cabinets with compression refrigerating system use a traditional evaporator W
composed of copper tubes and aluminum wings, which implies substantial disadvantages: the need of high amounts of refrigerating fluid to obtain the desired performances for the system, which cause an increase of consumptions, big sizes and weight, and scarce recyclability;
moreover, all known micro-channel evaporators have never been applied properly in the commercial refrigeration, in the form, in the modes and with the results disclosed in the present invention .
Object of the present invention is providing a refrigerating system which allows improving the previously known techniques, both regarding the traditional design of refrigerated cabinets, and in design and use of micro-channel evaporators, in order to allow:
- strongly reducing the charge of gas of the system;
- optimizing the load losses;
- reducing the weight of the machine in which it is inserted, also increasing its exhibiting capability; and
- having a very low environmental and energy impact . The above and other objects and advantages of the invention, with other ones, which will result from the following description, are obtained with a compression refrigerating system equipped with micro-channel evaporator as claimed in claim 1. Preferred embodiments and non-trivial variations of the present invention are the subject matter of the dependent claims.
It is intended that all enclosed claims are an integral part of the present description.
The present invention will be better described by some preferred embodiments thereof, provided as a non-limiting example, with reference to the enclosed drawings, in which:
- Figure 1 is a schematic view of a first preferred embodiment of an open vertical refrigerated cabinet, adapted to be closed with doors, according to the present invention;
- Figure 2 is an exploded schematic view of a preferred embodiment of the compression refrigerating system according to the present invention;
- Figure 3 is a schematic view of the refrigerated cabinet of Figure 1 without part of its external structure; - Figure 4 is a perspective view of the micro- channel evaporator of the present invention;
- Figure 5 is a top view of the micro-channel evaporator of Figure 4; and
- Figure 6 is a side view of the micro-channel evaporator of Figure .
With reference to the Figures, it will be immediately obvious that numerous variations and modifications (for example related to shape, sizes, arrangements and parts with equivalent functionality) can be made to what is described, without departing from the scope of the invention, as appears from the enclosed claims.
According to the Figures, the compression refrigerating system for commercial use of the present invention comprises:
a vertical refrigerated cabinet (2) comprising spaces (4) necessary for circulating air;
an insulated body (1) composed of foamed panels and placed around the vertical cabinet (2) ;
a series of sheet metals (3) placed inside the refrigerated cabinet (2), which are a structure for the refrigerated cabinet (2), to provide the areas where the food products to be exhibited are placed; and
at least one micro-channel aluminum evaporator (8) placed in the refrigerated cabinet (2) according to exclusive design geometry and positioning: it is of the two- rank type. Every rank is composed of two manifolds (11, 12 and 13, 14) mutually connected, preferably, by fifteen flat micro- channel tubes (15) arranged perpendicular with respect to the manifolds (11, 12 and 13, 14) themselves. The two ranks are mutually spaced by about 50mm and are connected through tubes (20) (preferably seven) placed on the two manifolds (11, 12 and 13, 14) from the same side of the evaporator (8). The inlet (16) of the evaporator (8) is placed on the manifold (13) of the second rank, while the outlet (17) is placed on the manifold (11) of the first rank. Inside the manifolds (11, 12 and 13, 14) dividing partitions are inserted, which create in total two passages for every rank. The pitch between the flat micro-channel tubes (15) is preferably equal to about 10 mm. Between a flat micro-channel tube (15) and the following a series of "V"- shaped aluminum wings (18) are placed, with a pitch of about 17.5 mm. The wings (18) on the two ranks are mutually offset by 180°.
The above refrigerating system can also comprise at least one condensing unit equipped with refrigerating fluid with hydrocarbons; the condensing unit is composed of the following major components: a compressor (5) and a condenser (6) mutually connected with airtight tubes. The compressor (5) can be of the alternative airtight type (commonly called "piston type") or alternative airtight with variable speed with inverter. The condenser (6) is of the type with aluminum micro- channels according to exclusive design geometries: of the single-rank type, it is composed of two manifolds (not shown) mutually connected by twenty- two flat micro-channel tubes (not shown) arranged perpendicular with respect to the manifolds themselves. Inlet and outlet of the condenser are placed on the same manifold. Inside the manifolds dividing partitions are inserted, which create a total of four passages. The pitch between the flat micro-channel tubes is preferably equal to about 10 mm. Between a flat micro-channel tube and the following one, there are a series of "V"-shaped aluminum wings (not shown) with a pitch of about 3.2 mm.
The refrigerating system of the invention can further comprise at least one laminating member (7) which mutually connects the condensing unit with compressor (5) and condenser (6) and the micro- channel evaporator (8): such laminating member (7) can be with capillary, with mechanic or electronic thermostatic valve.
Such compression refrigerating system allows a refrigerated cabinet (2) with an embedded or remote assemble, to have a very low impact both in energy and in environmental terms.
As refrigerating fluid of the refrigerating circuit, preferably, but not exclusively, propane gas, R290, is used: it is a natural refrigerating gas, efficient and with a zero environmental impact, which satisfies all requirements of EU Regulations n. 517/2014 of the European Parliament and Council.
EN 378 and IEC 60335-2-89 Standards disclose the safety standards which must be observed by the apparatuses which use hydrocarbons as refrigerating gas, specifically the propane R290. The refrigerating system of the present invention adopts technical innovative solutions, which allow satisfying all safety requirements, without in any way impairing the functional performances of the machine .
In particular, purpose of the present invention is providing a vertical refrigerated cabinet (2) with doors having a length greater than 2000 mm which, with a single circuit charged with less than 150 grams of propane gas (R290), is capable of keeping the exhibited product within the temperature classes (both positive and negative) described in the EN ISO 23953-2 Standard.
As alternative to the refrigerating propane gas R290, propene gas R1270, isobutane gas R600a or other hydrocarbon gases can be used.
In a known way, during the operation of the inventive system, such gas performs two state passages: the first inside the evaporator (8) in which the refrigerating element gas passes from its liquid state to its gaseous state (the necessary energy for the state passages is taken from the surrounding air which in this way cools down) , the second inside the condenser (6) in which the refrigerating element passes from its gaseous state to its liquid state (the necessary energy for the state passages is taken by the surrounding air, which in this way heats up) . The component which allows the refrigerating element to circulate inside the system is the compressor (5) , assembled on the condensing unit: its function is sucking gas exiting from the evaporator (8) and compress it towards the condenser (6) increasing both its pressure and its temperature. The fourth component of the system is the laminating member (7), which is placed between the condenser (6) and the evaporator (8): by means of a bottleneck of the system, it has the function of lowering both the pressure and the temperature of the refrigerating element coming from the condenser (6). It is also the component which controls the refrigerating flow which goes back into the evaporator (8) to repeat the above described cycle.
Inside the refrigerated cabinet (2) a forced air circulation is applied with the help of fans (9). In refrigerating cabinets (2) with different geometries with respect to those described herein, the air circulation can also be natural, namely without the use of fans. The described apparatus is managed by an electronic thermostat (10) which, by means of some probes, detects the system temperature and manages its operation.

Claims

Compression refrigerating system for commercial use comprising:
a vertical refrigerated cabinet (2) comprising spaces (4) necessary for circulating air;
an insulated body (1) composed of foamed panels and placed around the vertical cabinet (2) ;
a series of sheet metals (3) placed inside the refrigerated cabinet (2), which are a structure for the refrigerated cabinet (2), to provide the areas where the food products to be exhibited are placed; and
at least one micro-channel aluminum evaporator (8) placed inside the refrigerated cabinet (2) ,
characterized in that the micro-channel aluminum evaporator (8) is of a two-rank type, every rank being composed of two manifolds (11, 12 and 13, 14) mutually connected by flat micro- channel tubes (15) arranged perpendicular with respect to the manifolds (11, 12 and 13, 14), the two ranks being mutually connected through a welded holed plate (19) between two adjacent manifolds (11, 12 and 13, 14), an inlet (16) of the evaporator (8) being placed on the manifold (13) of the second rank while an outlet (17) is placed on the manifold (11) of the first rank, inside the manifolds (11, 12 and 13, 14) (11, 12 and 13, 14) dividing partitions being inserted, which create a total of two passages for every rank.
2. Refrigerating system according to claim 1, characterized in that the flat micro-channel tubes (15) are fifteen and the pitch between the flat micro-channel tubes (15) is of about 10 mm.
3. Refrigerating system according to claim 1 or 2, characterized in that, between a flat micro-channel tube (15) and the following one, the evaporator (8) further comprises a series of "V"-shaped aluminum wings (18), the wings (18) on the two ranks being mutually offset by 180°.
4. Refrigerating system according to claim 1, 2 or 3, characterized in that it further comprises at least one condensing unit equipped with refrigerating fluid with hydrocarbons, said condensing unit being composed of a compressor (5) and a condenser (6) mutually connected with airtight tubes; and at least one laminating member (7) connected to the condensing unit and to the micro-channel evaporator (8).
Refrigerating system according to claim 4, characterized in that said refrigerating fluid is propane gas (R290) with a charge not greater than 150 g.
Refrigerating system according to claim 4, characterized in that said refrigerating fluid is propene gas (R1270) with a charge not greater than 150 g.
Refrigerating system according to claim 4, characterized in that said refrigerating fluid is isobutane gas (R600a) with a charge not greater than 150 g, or a hydrocarbon gas.
Refrigerating system according to any one of claims 4 to 7, characterized in that the compressor (5) is of an alternative airtight piston type or of an alternative airtight type with variable speed with inverter.
Refrigerating system according to any one of claims 4 to 8, characterized in that the condenser (6) is of a type with aluminum micro- channels according to geometries of a single- rank type, is composed of two manifolds mutually connected by twenty-two flat micro-channel tubes arranged perpendicular with respect to the manifolds, an inlet and an outlet of the condenser (6) being placed on a same manifold, inside the manifolds dividing partitions being inserted, which create a total of four passages, the pitch between the flat micro-channel tubes being preferably of about 10 mm.
10. Refrigerating system according to claim 9, characterized in that the condenser (6) further comprises, between a flat micro-channel tube and the following one, a series of "V"-shaped aluminum wings with pitch of about 3.2 mm.
11. Refrigerating system according to any one of claims 4 to 10, characterized in that the laminating member (7) is a capillary, or a mechanic or electronic thermostatic valve.
12. Refrigerating system according to any one of the previous claims, characterized in that the two manifolds (11, 12 and 13, 14) are mutually connected by fifteen flat micro-channel tubes (15) arranged perpendicular with respect to the manifolds (11, 12 and 13, 14), the two ranks being mutually spaced by about 50 mm and being connected through seven tubes (20) placed on the two manifolds (11, 12 and 13, 14) on a same side of the evaporator (8), the pitch between the flat micro-channel tubes (15) being of about 10 mm.
13. Refrigerating system according to any one of the previous claims, characterized in that inside the refrigerated cabinet (2) a forced air circulation is applied with the help of fans (9) .
14. Refrigerating system according to any one of claims 1 to 12, characterized in that inside the refrigerated cabinet (2) a natural air circulation, namely without the use of fans, is applied.
15. Refrigerating system according to any one of the previous claims, characterized in that it is managed by an electronic thermostat (10) which, by means of probes, detects the temperature of the system and manages its operation.
PCT/IT2018/000007 2017-02-07 2018-01-22 Compression refrigerating system equipped with micro-channel evaporator WO2018146705A1 (en)

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IT102017000013218A IT201700013218A1 (en) 2017-02-07 2017-02-07 Compression refrigerator system equipped with microchannel evaporator
IT102017000013218 2017-02-07

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
IT201900025159A1 (en) * 2019-12-20 2021-06-20 Friulair S R L AIR CONDITIONING APPARATUS

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