USRE32083E - Reduction of superheating - Google Patents

Reduction of superheating Download PDF

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Publication number
USRE32083E
USRE32083E US06/632,887 US63288784A USRE32083E US RE32083 E USRE32083 E US RE32083E US 63288784 A US63288784 A US 63288784A US RE32083 E USRE32083 E US RE32083E
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US
United States
Prior art keywords
housing
solution
lithium halide
generator
baffle
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 - Fee Related
Application number
US06/632,887
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English (en)
Inventor
Isaih Vardi
Joseph Bourne
Jonathan Ben-Dror
Yigal Kimchi
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.)
ESHEL RESIDUAL ENERGY FOR COOLING AND HEATING Ltd INDUSTRIAL ZONE AZOR ISRAEL (PO BOX 30 AZOR)
Eshel Residual Energy For Cooling and Heating Ltd
Original Assignee
Eshel Residual Energy For Cooling and Heating Ltd
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 Eshel Residual Energy For Cooling and Heating Ltd filed Critical Eshel Residual Energy For Cooling and Heating Ltd
Assigned to ESHEL RESIDUAL ENERGY FOR COOLING AND HEATING LTD., INDUSTRIAL ZONE, AZOR, ISRAEL (P.O. BOX 30, AZOR) reassignment ESHEL RESIDUAL ENERGY FOR COOLING AND HEATING LTD., INDUSTRIAL ZONE, AZOR, ISRAEL (P.O. BOX 30, AZOR) ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BEN-DROR, JONATHAN, BOURNE, JOSPEH, KIMCHI, YIGAL, VARDI, ISAIH
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Publication of USRE32083E publication Critical patent/USRE32083E/en
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
    • C09K5/02—Materials undergoing a change of physical state when used
    • C09K5/04—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa
    • C09K5/047—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa for absorption-type refrigeration systems
    • 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
    • F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
    • F25B15/02—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas
    • F25B15/06—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas the refrigerant being water vapour evaporated from a salt solution, e.g. lithium bromide
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
    • 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]
    • Y02B30/62—Absorption based systems
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency

Definitions

  • the present invention relates to improvements in absorption refrigeration systems of the type using a lithium halide (lithium bromide and/or chloride) and water cycle or another absorbent. More particularly the present invention relates to an improvement in such systems wherein a generator is used wherein the lithium halide solution is heated to remove water in vapor form so as to obtain a more concentrated lithium halide solution or where similar liquids are used which tend to give superheated solutions.
  • a lithium halide lithium bromide and/or chloride
  • water cycle or another absorbent More particularly the present invention relates to an improvement in such systems wherein a generator is used wherein the lithium halide solution is heated to remove water in vapor form so as to obtain a more concentrated lithium halide solution or where similar liquids are used which tend to give superheated solutions.
  • the liquid i.e. the lithium halide solution drips off the tubular elements and is passed on from there via an exit port to another section of the cooling machine.
  • the solution which drips off the bottom tubes of a thin film evaporator is generally superheated, and this to a degree of about 10° to 13° F. This superheating causes substantial thermodynamic losses and decreases the overall efficiency of the cooling cycle.
  • the present invention relates to improvements in absorption refrigeration machines wherein a lithium halide, such as lithium bromide and/or lithium chloride/water cycle is used.
  • a lithium halide such as lithium bromide and/or lithium chloride/water cycle is used.
  • an extended path is provided by introducing baffle means into the sections of the machine at which such concentrated lithium halide is drained and circulated to other parts of the machine.
  • splash baffles are provided at the bottom part of the generator section of a cooling machine of this type, beneath the lowest row of tubes in such generator section which baffles substantially increase the path of the concentrated lithium halide from said thin film evaporator tubes and to the exit port of said generator section from where the concentrated lithium halide is circulated to the section of the machine.
  • Droplets have a comparatively small surface area, and thus the superheating is substantial.
  • the droplets move along these, spread out and form a surface film. Evaporation from such film is much better, and thus superheating is substantially reduced.
  • the lithium halide which is concentrated in this section is frequently superheated to an appreciable degree, i.e. by a number of degrees F., and according to the present invention this superheating is substantially reduced by providing a structure wherein the said superheated lithium halide solution is passed over one or more baffles, whereby the superheating is substantially reduced .
  • the added compartment with the baffles can be of a size which extends only along a part of the length of the generator section.
  • the dimensions of the baffles have to be such as to provide for an efficient removal of excess heat from the superheated lithium halide solution.
  • baffles The extended pathway of the superheated liquid along said baffles is adequate to substantially reduce the superheating. While this reaches frequently up to about 12° or even 13° F. with thin film evaporators, and where the liquid leaves the shell of this compartment while still superheated by about 7° to 8° F., the provision of efficient baffles reduces the superheating and this is reduced to about 2° to 6° F.
  • the baffles are of simple construction and need practically no maintenance. The saving of energy is a substantial one and exceeds by far the costs of such baffle means.
  • FIG. 1 is an elevational cross-sectional view through the lower part of a housing wherein there are positioned a generator and condenser section of a spray type generator operating on the principle of thin film evaporation.
  • FIG. 2 is an elevational cross-sectional view through a flooded type generator with attached compartment containing a plurality of baffles for reducing superheating.
  • the generator section a number of rows of tubes 11 disposed below the spraying device 10, and droplets of superheated liquid lithium bromide drip off the lowermost row of these.
  • droplets drop onto the bottom of the housing 12, and leave via exit port 13 as superheated liquid.
  • the exit port 13 is connected to a flow line leading to the absorber of the refrigeration machine.
  • baffle plate 14 there are provided two inclined baffles 14 and 15, one of which is attached to the housing 12, the other to the upright structure 16, and thus droplets dripping off from the tubes 11 fall on baffle plate 14, move along it and drop onto baffle plate 15, and move along it until the liquid drips off at its edge 17. As the liquid moves along the baffle plates 14 and 15 it evaporates some water vapor and the superheating is substantially reduced.
  • a flooded type generator comprises a housing 21, wherein a plurality of tubes 22 are located in the liquid lithium bromide 23. Along a part of the length of the tubular unit 21 there is provided a housing 24. A typical length of a cooling machine of this type is about 15 feet, and in such case a housing 24 of about 18 inch will be adequate.
  • the housing 21 is provided with an outlet port 25 and with an upper opening 26. Superheated liquid leaves via port 25, into the adjacent chamber 27 wherein a plurality of staggered baffles 28, 29 and 30 are provided, baffle 29 being attached to wall 31 and baffles 28 and 30 to wall 32.
  • the liquid starts to boil when it enters the chamber 27, and the liquid moves along the baffles 28, 29 and 30, and thus the degree of superheating is substantially reduced, until the liquid leaves via exit opening 33.
  • the exit opening 33 like the exit port 13 of FIG. 1, is connected to a flow line leading to an absorber of the refrigeration machine.
  • the provision of the extended baffles substantially increases the surface to which the superheated liquid is exposed, and the superheated liquid thus loses much of its excess of heat.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Organic Chemistry (AREA)
  • Sorption Type Refrigeration Machines (AREA)
US06/632,887 1980-03-25 1984-07-20 Reduction of superheating Expired - Fee Related USRE32083E (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IL59708A IL59708A (en) 1980-03-25 1980-03-25 Absorption refrigeration system and method
IL59708 1980-03-25

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US06/246,844 Reissue US4383424A (en) 1981-03-23 1981-03-23 Reduction of superheating

Publications (1)

Publication Number Publication Date
USRE32083E true USRE32083E (en) 1986-02-18

Family

ID=11051714

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/632,887 Expired - Fee Related USRE32083E (en) 1980-03-25 1984-07-20 Reduction of superheating

Country Status (4)

Country Link
US (1) USRE32083E (enrdf_load_stackoverflow)
DE (1) DE3111772A1 (enrdf_load_stackoverflow)
GB (1) GB2072823B (enrdf_load_stackoverflow)
IL (1) IL59708A (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9918581D0 (en) * 1999-08-06 1999-10-06 British Gas Plc A generator for an absorption chiller

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1630648A (en) * 1923-12-22 1927-05-31 Sulzer Ag Absorption refrigerator
US3158008A (en) * 1962-10-10 1964-11-24 Worthington Corp Absorption refrigeration apparatus
US3225556A (en) * 1964-02-24 1965-12-28 Worthington Corp Capacity control for absorption refrigeration
US3267691A (en) * 1964-10-23 1966-08-23 Borg Warner Cooling and lubricating system for absorption refrigeration apparatus

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL121565C (enrdf_load_stackoverflow) * 1960-03-02
CA924917A (en) * 1969-04-04 1973-04-24 H. Merrick Richard Horizontally fired heat exchanger
US3977211A (en) * 1975-11-14 1976-08-31 Carrier Corporation Alcohol separator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1630648A (en) * 1923-12-22 1927-05-31 Sulzer Ag Absorption refrigerator
US3158008A (en) * 1962-10-10 1964-11-24 Worthington Corp Absorption refrigeration apparatus
US3225556A (en) * 1964-02-24 1965-12-28 Worthington Corp Capacity control for absorption refrigeration
US3267691A (en) * 1964-10-23 1966-08-23 Borg Warner Cooling and lubricating system for absorption refrigeration apparatus

Also Published As

Publication number Publication date
DE3111772C2 (enrdf_load_stackoverflow) 1991-09-12
IL59708A (en) 1984-04-30
IL59708A0 (en) 1980-06-30
GB2072823B (en) 1984-02-29
GB2072823A (en) 1981-10-07
DE3111772A1 (de) 1982-07-01

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Owner name: ESHEL RESIDUAL ENERGY FOR COOLING AND HEATING LTD.

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