US3740967A - Forced flow vaporizer for compression type refrigerating equipment - Google Patents

Forced flow vaporizer for compression type refrigerating equipment Download PDF

Info

Publication number
US3740967A
US3740967A US00131913A US13191371A US3740967A US 3740967 A US3740967 A US 3740967A US 00131913 A US00131913 A US 00131913A US 13191371 A US13191371 A US 13191371A US 3740967 A US3740967 A US 3740967A
Authority
US
United States
Prior art keywords
pipe
vaporizer
mesh
inserts
fins
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.)
Expired - Lifetime
Application number
US00131913A
Other languages
English (en)
Inventor
Z Huelle
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.)
Danfoss AS
Original Assignee
Danfoss AS
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 Danfoss AS filed Critical Danfoss AS
Application granted granted Critical
Publication of US3740967A publication Critical patent/US3740967A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
    • 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
    • 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
    • F28F1/24—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 and extending transversely
    • F28F1/32—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 and extending transversely the means having portions engaging further tubular elements

Definitions

  • the effective outside radiating surface of the pipe is in- [52] 11.8.
  • CI. 62/527, 165/179 creased with fins and mesh inserts are disposed i t i [5 l Int. Cl. F25b 41/04 orly of the pipe, the fins and inserts only being provided [58] Field of Search 165/179; 62/515, for the straight portions of the pipe.
  • This invention relates to a forced-flow vaporizer for compression-type refrigerating equipment and having a pipe through which refrigerant flows and at the end of which only refrigerant vapour emerges.
  • a flooded vaporizer in which a mesh insert, which only slightly reduces the inside cross-section of the bore, is located closely against the inside surface.
  • the purpose of this insert is to trap liquid which may be present on the inside wall of the pipe, so that it is not entrained in the refrigerant vapour.
  • the object of the invention is to provide a forcedflow vaporizer for compression-type refrigerating equipment in which, for a given transmitted refrigerating capacity, both an extremely small pressure-drop and a very high state of fill of the system are achieved.
  • a forced-flow vaporizer for compression-type refrigerating equipment having a pipe through which in operation a refrigerant flows and at the end of which only refrigerant vapour emerges, and in which the effective outside radiating vapour emerges, and in which the effective outside reaiating surface of the pipe is increased by the provision of fins or the equivalent, the inner surface of the pipe is smooth and the pipe accommodates a mesh insert, which only slightly reduces the effective internal cross-section of the pipe the mesh insert being disposed closely against the inner surface of the pipe.
  • the mesh insert only slightly increases the resistance to flow of the vaporizer pipe.
  • the combination of features specified makes it possible to obtain coefficients of heat transmission k, hitherto not attainable, for the transfer of heat between the refrigerant and the medium to be cooled, in particular air.
  • k hitherto attainable were in the order of 12 13
  • a coefficient of heat transmission of more than 20 can be obtained by means of the invention. Consequently, the length of the pipe can be considerably shortened for a prescribed transferred refrigerating capacity, and the pressuredrop can be reduced to a considerably lower value. If this principle is applied to two or more pipes arranged in parallel, very much greater refrigerating capacities than heretofore can be transferred under otherwise similar conditions.
  • the straight portions of the pipes of a vaporizer are frequently interconnected by means of return bends and in applying a feature of the invention the fins and the mesh inserts are provided only along the straight portions of the pipes. Since the return bends constitute only a small part of the entire vaporizer pipe, it suffices to apply the measures for increasing the coefficient of heat transmission only to the straight portions. In this way, the fine, e.g., common fins, for all the straight pipe portions as well as the mesh inserts which can be inserted into the pipe-portion at one of its end-faces, can be more readily fitted.
  • each mesh insert consists of an elongate, flat length of mesh material, the width of which is some what smaller than the inside circumference of the pipe and which, prior to insertion in the pipe is bent to form a tube of generally circular cross-section biassed to a diameter less than that of the pipe, the material of the mesh being such that on insertion into the pipe the mesh tube will expand and closely engage the inner surface of the pipe.
  • edges of the elements of mesh material are so arranged that they form a gap at the bottom of the interior of the pipe. If oil is separated out in the vaporizer, it can flow away through the gap. The required position of the channel provided by the gap can be best achieved if each straight portion of the pipe is provided with a separate mesh insert.
  • heat transfer is achieved on the outside by an increase in area, and on the inside by increased degree of wetting.
  • FIG. 1 is a schematic longitudinal section through a vaporizer for use in compression-type equipment
  • FIG. 2 is a diagrammatic cross-section of the vaporizer shown to a larger scale than FIG. 1.
  • a refrigerant compressor 1 passes refrigerant into a vaporizer 2 by way of a pressure pipe.
  • the vaporizer 2 feeds liquid refrigerant into a vaporizer 4, the flow of refrigerant being controlled by an expansion valve 3.
  • the vaporized refrigerant returns to the compressor 1 through a vacuum pipe.
  • the expansion valve 3 is controlled by a temperature sensor 5, which is fitted at the outlet 6 of the vaporizer 4.
  • the vaporizer 4 has a single pipe 7 consisting of stright portions 8 and return bends 9 interconnecting the straight portions.
  • the pipe is held in supports 10 at each end.
  • the straight portions 8 of the pipe have common heat-transfer fins 11.
  • a mesh insert 12 is pushed into each straight portion of pipe. The air to be cooled flows in a direction parallel with the fins 11.
  • the inserts 12 are shown only diagrammatically.
  • they are made of metal gauze produced in flat pieces. Strip elements cut from these pieces, are bent to the shape of a tube and are inserted into the straight portions 8 of pipe in a biassed condition before these straight portions have been interconnected by means of the return bends 9.
  • biassed condition is meant that the strip gauze elements when bent into tubular form, tend by their nature to expand to a larger diameter.
  • the elements when they have been inserted in the pipe sections they will expand so as closely to engage the inner pipe walls to leave gaps 13 between their opposing edges. The elements are positioned so that the gaps 13 are positioned at the bottoms of the pipe sections 8.
  • a heat-transfer coefficient a, of 25 was recorded on the outside and a heat-transfer coefficient 01 of 1,400 on the inside, and the ratio of the outside area to the inside area was found to be 13.7. This resulted in a coefficient of heat transmission k of 20, this value not having previously been attained in the case of forced-flow vaporiz ers for the cooling of air.
  • a forced-flow vaporizer for compression-type refrigerating equipment comprising a pipe for conveying a refrigerant therethrough, fins for increasing the outside radiating surface of the pipe, said pipe having a smooth inner surface, mesh inserts disposed in said pipe in close engagement with said inner surface, said pipe having straight portions interconnected by return bends, said tins and mesh inserts being provided only along the straight portions of said pipe, each of said mesh inserts consisting of an element of mesh material having a circumference which is slightly larger than the internal circumference of said pipe and which has a resilience causing it to be resiliently biased and expanded against said inner surface of said pipe, at least one of said inserts having opposing longitudinally extending edges located at the bottom of the interior of one of said pipe portions to form a longitudinally extending gap.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
US00131913A 1970-03-23 1971-04-07 Forced flow vaporizer for compression type refrigerating equipment Expired - Lifetime US3740967A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702013808 DE2013808B2 (de) 1970-03-23 1970-03-23 Zwangsdurchlauf-verdampfer einer kompressionskaelteanlage

Publications (1)

Publication Number Publication Date
US3740967A true US3740967A (en) 1973-06-26

Family

ID=5765969

Family Applications (1)

Application Number Title Priority Date Filing Date
US00131913A Expired - Lifetime US3740967A (en) 1970-03-23 1971-04-07 Forced flow vaporizer for compression type refrigerating equipment

Country Status (8)

Country Link
US (1) US3740967A (de)
AT (1) AT310206B (de)
CH (1) CH521559A (de)
DE (1) DE2013808B2 (de)
FR (1) FR2084926A5 (de)
GB (1) GB1277554A (de)
NL (1) NL7103754A (de)
NO (1) NO130880C (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4291751A (en) * 1979-08-16 1981-09-29 Wolf Bernard A Thermal inverter
US5040380A (en) * 1988-08-04 1991-08-20 Super S.E.E.R. Systems Inc. Method and apparatus for the sensing of refrigerant temperatures and the control of refrigerant loading
US6032726A (en) * 1997-06-30 2000-03-07 Solid State Cooling Systems Low-cost liquid heat transfer plate and method of manufacturing therefor
US6354002B1 (en) 1997-06-30 2002-03-12 Solid State Cooling Systems Method of making a thick, low cost liquid heat transfer plate with vertically aligned fluid channels
US6536450B1 (en) * 1999-07-07 2003-03-25 Semitool, Inc. Fluid heating system for processing semiconductor materials
US6736150B2 (en) 1999-07-06 2004-05-18 Semitool, Inc. Fluid heating system for processing semiconductor materials
US20070108304A1 (en) * 2005-11-02 2007-05-17 Eiji Seki Hot water supply device
US20080099191A1 (en) * 2005-02-02 2008-05-01 Carrier Corporation Parallel Flow Heat Exchangers Incorporating Porous Inserts
WO2016207598A1 (en) * 2015-06-23 2016-12-29 Edwards Limited Device and method for controlling a phase transition of a fluid between liquid and vapour states

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2500141A1 (fr) * 1981-02-19 1982-08-20 Cordier Francoise Echangeur de chaleur air-liquide a convection naturelle

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4291751A (en) * 1979-08-16 1981-09-29 Wolf Bernard A Thermal inverter
US5040380A (en) * 1988-08-04 1991-08-20 Super S.E.E.R. Systems Inc. Method and apparatus for the sensing of refrigerant temperatures and the control of refrigerant loading
US6032726A (en) * 1997-06-30 2000-03-07 Solid State Cooling Systems Low-cost liquid heat transfer plate and method of manufacturing therefor
US6354002B1 (en) 1997-06-30 2002-03-12 Solid State Cooling Systems Method of making a thick, low cost liquid heat transfer plate with vertically aligned fluid channels
US6736150B2 (en) 1999-07-06 2004-05-18 Semitool, Inc. Fluid heating system for processing semiconductor materials
US6536450B1 (en) * 1999-07-07 2003-03-25 Semitool, Inc. Fluid heating system for processing semiconductor materials
US20080099191A1 (en) * 2005-02-02 2008-05-01 Carrier Corporation Parallel Flow Heat Exchangers Incorporating Porous Inserts
US20070108304A1 (en) * 2005-11-02 2007-05-17 Eiji Seki Hot water supply device
WO2016207598A1 (en) * 2015-06-23 2016-12-29 Edwards Limited Device and method for controlling a phase transition of a fluid between liquid and vapour states
US10514212B2 (en) 2015-06-23 2019-12-24 Edwards Limited Device and method for controlling a phase transition of a fluid between liquid and vapour states

Also Published As

Publication number Publication date
CH521559A (de) 1972-04-15
AT310206B (de) 1973-09-25
NO130880C (de) 1975-02-26
DE2013808A1 (de) 1971-10-07
NO130880B (de) 1974-11-18
FR2084926A5 (de) 1971-12-17
GB1277554A (en) 1972-06-14
DE2013808B2 (de) 1976-04-08
NL7103754A (de) 1971-09-27

Similar Documents

Publication Publication Date Title
US3938349A (en) Refrigerating apparatus with superheat control
US5765391A (en) Refrigerant circulation apparatus utilizing two evaporators operating at different evaporating temperatures
US3740967A (en) Forced flow vaporizer for compression type refrigerating equipment
US2589384A (en) Reversible heat pump cycle with means for adjusting the effective charge
US2385667A (en) Refrigerating system
US2415243A (en) Refrigeration apparatus and method of making same
US2121253A (en) Heat exchanger and accumulator
US2183343A (en) Refrigeration apparatus and method
US3246482A (en) Heat pumps
US2964926A (en) Flooded water chiller
ITTO940727A1 (it) Impianto frigorifero
US2242334A (en) Refrigerating system
US2785542A (en) Capillary coupled heat exchangers
US2510881A (en) Refrigeration system
US2901894A (en) Refrigerant control means
US1919500A (en) Apparatus for controlling the flow of refrigerant in refrigerating apparatus
US2138777A (en) Refrigeration
US2434118A (en) Restrictor tube for refrigerating systems
US2979917A (en) Cooling arrangement for hermetically sealed refrigerant compressor
US2137260A (en) Refrigerating apparatus
US2056022A (en) Flow controlling device for refrigerating systems
US2069630A (en) Flow controlling device for refrigerating systems
US2740263A (en) Feed control means for refrigerating apparatus
DE1751717B2 (de) Kühlanlage, deren Verdampfer über ein regulierbares Expansionsventil gespeist wird
US2188893A (en) Refrigerating apparatus