US2769310A - Cooling arrangements using eutectic solutions - Google Patents

Cooling arrangements using eutectic solutions Download PDF

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Publication number
US2769310A
US2769310A US314723A US31472352A US2769310A US 2769310 A US2769310 A US 2769310A US 314723 A US314723 A US 314723A US 31472352 A US31472352 A US 31472352A US 2769310 A US2769310 A US 2769310A
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United States
Prior art keywords
solution
tank
eutectic
cooling
tanks
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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
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US314723A
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English (en)
Inventor
Stickland Frank Samuel
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.)
Stone J and Co Ltd
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Stone J and Co Ltd
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Publication date
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Publication of US2769310A publication Critical patent/US2769310A/en
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    • 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
    • F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
    • F25D3/005—Devices using other cold materials; Devices using cold-storage bodies combined with heat exchangers

Definitions

  • holdover value drops to about 25% of the value for the fresh solution. This loss is ascribed to a change of condition in the solution of which visual evidence is afforded by the deposition of salt crystals in the bottom of the tank. A similar phenomenon has been noted with potassium chromate.
  • the invention seeks to overcome this ditficulty and to insure that a holdover value at least approaching the theoretical figure is maintained.
  • an arrangement of the kind set forth comprises in combination with the tank containing the eutectic solution and the coil for cooling the said solution, a pump for positively circulating the solution in the tank.
  • the pump may be a small rotary pump driven by an electric motor and thermostatically controlled so that circulation is produced as long as the solution is at temperatures above or well above its freezing point, for example about 40 F. in the case of sodium chloride. Separation appears to occur only during thawing and circulation during this stage would be sufficient.
  • Fig. 1 is a longitudinal section through a tank, on the line II in Fig. 2,
  • Fig. 2 is a cross section on the line IIII in Fig. 1,
  • Fig. 3 is a perspective diagram of a bank of such tanks.
  • Fig. 4 a circuit diagram.
  • a fiat plate-shaped steel tank 1 which contains a Patented Nov. 6, 1956 eutectic solution of, say, sodium chloride is provided with a zig-zag tube 2 (Figs. 1 and 3) constituting an evaporator coil which is adapted for being connected to refrigerating apparatus for the periodical pro-cooling of the said solution, the plate itself being thereafter used for cooling purposes, all in well known manner.
  • the tank 1 or each tank 1 of a bank of tanks (Fig. 3) is provided with an inlet 3 at the top of the tank and an outlet 4 at the bottom.
  • the inlet 3 and outlet 4 of the tank, or of a bank of tanks in series (Fig. 3), are connected to the delivery side 5 and the suction side 6 respectively of a small rotary pump 7, driven by an electric motor 8.
  • the starting and stopping of the motor are controlled by a thermostat 9 whose temperature-sensitive element is located in the suction line 10 of the pump.
  • the thermostat 9 is arranged to control the motor 8 in such a manner that the pump 7 is driven and the solution positively maintained in circulation as long as the temperature of the solution is well above its freezing point, for example about 40 F. in the case of sodium chloride.
  • the solution is drawn off at the bottom of the tank or tanks and is delivered to the top of the said tank or tanks, so that the whole of the solution is subject to the agitating effect of the circulation.
  • the inlet 3 and outlet 4 may be disposed near diagonally opposite corners of the tank.
  • FIG. 3 Several tanks 1 may be connected in series to a single pump 7, the outlet 4 of one tank being connected to the inlet 3 of the next, as shown in Fig. 3.
  • the sealing of each tank 1 under vacuum would present difliculty, each tank is vented to the air through a plug 11 (Figs. 1 and 2).
  • Figs. 1 and 2 As the tanks 1 cannot be completely filled, because room must be left for expansion of the solution on freezing, only tanks at the same level can be connected to a common pump 7. Tanks or banks of tanks at different levels should be connected to individual pumps.
  • a thermostat of the known mercury-in-glass type is connected in series with the winding 12 of a thermostat relay when contacts 13 are in turn connected in series with the winding 14 of a main relay.
  • the contacts 15 of the latter relay control the supply of current to the motor 8 from D. C. supply mains 16.
  • Also connected in series with the thermostat 9 and 1 winding 12 are contacts 17 of a master control switch and interlock contacts 18 which are closed only when the current supply (usually A. C.) is connected to the refrigerating apparatus for pre-cooling. Consequently, the motor 8 is energized to drive the circulating pump 7 only as long as the temperature in the line 10 is above the predetermined value for the thermostat 9 and then only if the control switch contacts 17 and the interlock contacts 18 have been closed.
  • a tank for containing a eutectic solution serving as a cold-storing medium said tank having walls through which heat passes by conduction to the eutectic solution for effecting the cooling, a cooling coil extending within said tank for flow of a fluid refrigerating medium for cooling and freezing said eutectic solution, means for withdrawing said eutectic solution from said tank when in the liquid state and agitating said withdrawn solution to reduce precipitation and settling out of the solute of said eutectic solution, said withdrawing and agitating means comprising a system of piping connected with said tank, a pump connected in said system, an electric motor connected for driving said pump, said motor having an electric current supply circuit connected thereto, a current connecting and interrupting device connected in said circuit, thermostatic means responsive solely to the temperature of the eutectic solution for controlling said current connecting and interrupting device to close said circuit and supply current to said motor only when said solution is at a temperature substantially above its freezing point.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Meat, Egg Or Seafood Products (AREA)
  • Non-Alcoholic Beverages (AREA)
US314723A 1951-10-18 1952-10-14 Cooling arrangements using eutectic solutions Expired - Lifetime US2769310A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB24378/51A GB710010A (en) 1951-10-18 1951-10-18 Improvements relating to cooling arrangements using eutectic solutions

Publications (1)

Publication Number Publication Date
US2769310A true US2769310A (en) 1956-11-06

Family

ID=10210789

Family Applications (1)

Application Number Title Priority Date Filing Date
US314723A Expired - Lifetime US2769310A (en) 1951-10-18 1952-10-14 Cooling arrangements using eutectic solutions

Country Status (6)

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US (1) US2769310A (en))
BE (1) BE514736A (en))
CH (1) CH304146A (en))
DE (1) DE926190C (en))
FR (1) FR1068103A (en))
GB (1) GB710010A (en))

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3481154A (en) * 1968-02-28 1969-12-02 Sarah A Johnson Means to retain food and drink items at their prepared temperatures
US5272887A (en) * 1992-08-11 1993-12-28 Zendzian Sr Peter R Portable refrigeration hold-over pack

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2517921A1 (de) * 1975-04-23 1976-11-04 Philips Patentverwaltung Latentwaermespeicher
DE2802343C2 (de) * 1978-01-20 1982-04-22 Peter Prof. Dr.-Ing. Friderichs Latentwärmespeicher-Behälter
FR2433319A1 (fr) * 1978-08-16 1980-03-14 Bordas Robert Meuble destine a la conservation de produits tels que vin en bouteille, ou autres denrees
IT1290117B1 (it) * 1997-03-18 1998-10-19 Selnor Scambiatore di calore quale un condensatore e/o un evaporatore per un apparecchio generatore di freddo

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2117505A (en) * 1936-07-31 1938-05-17 George D Reinhardt Refrigerating cabinet
US2292692A (en) * 1941-05-23 1942-08-11 Francis A Hoover Liquid refrigerating unit
US2448453A (en) * 1944-09-11 1948-08-31 Joseph I Morrison Liquid cooling system
US2538015A (en) * 1948-01-17 1951-01-16 Dole Refrigerating Co Liquid cooler

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2117505A (en) * 1936-07-31 1938-05-17 George D Reinhardt Refrigerating cabinet
US2292692A (en) * 1941-05-23 1942-08-11 Francis A Hoover Liquid refrigerating unit
US2448453A (en) * 1944-09-11 1948-08-31 Joseph I Morrison Liquid cooling system
US2538015A (en) * 1948-01-17 1951-01-16 Dole Refrigerating Co Liquid cooler

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3481154A (en) * 1968-02-28 1969-12-02 Sarah A Johnson Means to retain food and drink items at their prepared temperatures
US5272887A (en) * 1992-08-11 1993-12-28 Zendzian Sr Peter R Portable refrigeration hold-over pack

Also Published As

Publication number Publication date
FR1068103A (fr) 1954-06-22
CH304146A (fr) 1954-12-31
GB710010A (en) 1954-06-02
BE514736A (en))
DE926190C (de) 1955-04-07

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