GB1171084A - Improvements in or relating to Defrosting of Cooling Systems. - Google Patents

Improvements in or relating to Defrosting of Cooling Systems.

Info

Publication number
GB1171084A
GB1171084A GB06007/68A GB1600768A GB1171084A GB 1171084 A GB1171084 A GB 1171084A GB 06007/68 A GB06007/68 A GB 06007/68A GB 1600768 A GB1600768 A GB 1600768A GB 1171084 A GB1171084 A GB 1171084A
Authority
GB
United Kingdom
Prior art keywords
contact
fan
energized
evaporator
motor
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
Application number
GB06007/68A
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.)
Controls Company of America
Original Assignee
Controls Company of America
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 Controls Company of America filed Critical Controls Company of America
Publication of GB1171084A publication Critical patent/GB1171084A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/001—Compression cycle type
    • 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
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/02—Detecting the presence of frost or condensate
    • F25D21/025—Detecting the presence of frost or condensate using air pressure differential detectors

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Defrosting Systems (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Abstract

1,171,084. Defrosting. CONTROLS CO. OF AMERICA. 3 April, 1968 [21 April, 1967], No. 16007/68. Heading F4H. [Also in Division H1] In a cooling system in which a centrifugal fan 20 draws air over a refrigerant evaporator 16, defrosting of the evaporator by a heater 32 is initiated in response to an increase in speed of the fan motor 28 resulting from a reduction of the load on the fan by ice formation on the evaporator. During a cooling cycle, a contact 41 of a toggle switch 35 and a fixed contact 44 are in contact so that the fan motor 28 and the refrigerant compressor 10 are energized. When the motor speed increases to a given value, a weight 108 which is pivoted at 118 on a disc 106 rotated by the motor moves outwardly against a spring 120 and strikes a member 130 of the toggle switch so that the contacts 41 and 44 are broken and the contact 41 engages a further fixed contact 56. The fan motor and compressor are thus de-energized and the defrost heater 32 is energized. When the temperature in the region of the evaporator has risen to a given level, the arm 46 of a thermal switch 40 moves to engage a contact 84, thereby energizing a reset heater 92 to heat a bimetal strip 88. The strip 88 flexes and moves a rod 90 downwardly on to the member 130 of the toggle switch to reset the latter and thereby re-establish the cooling cycle. The air flow from the fan is used to cool a cold room, and a switch 74 is operated by the room door so that when the latter is open, the fan motor is switched off and a room light 84 is energized.
GB06007/68A 1967-04-21 1968-04-03 Improvements in or relating to Defrosting of Cooling Systems. Expired GB1171084A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US632788A US3397550A (en) 1967-04-21 1967-04-21 Defrost control means responsive to speed of evaporator blower

Publications (1)

Publication Number Publication Date
GB1171084A true GB1171084A (en) 1969-11-19

Family

ID=24536942

Family Applications (1)

Application Number Title Priority Date Filing Date
GB06007/68A Expired GB1171084A (en) 1967-04-21 1968-04-03 Improvements in or relating to Defrosting of Cooling Systems.

Country Status (5)

Country Link
US (1) US3397550A (en)
DE (1) DE1751173A1 (en)
ES (1) ES352950A1 (en)
FR (1) FR1560158A (en)
GB (1) GB1171084A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3464224A (en) * 1967-12-22 1969-09-02 Clark Equipment Co Means and method for controlling a refrigeration system
US4280332A (en) * 1979-07-30 1981-07-28 Intertherm Inc. Defrost control monitoring fan motor temperature rise
US4316365A (en) * 1980-10-20 1982-02-23 Honeywell Inc. Defrost control system for refrigeration system
FR2595806A1 (en) * 1986-03-12 1987-09-18 Total Energie Dev Method and device for detecting frost on a heat exchanger

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2001028A (en) * 1932-09-26 1935-05-14 Frick Co Defrosting system

Also Published As

Publication number Publication date
FR1560158A (en) 1969-03-14
ES352950A1 (en) 1969-09-16
DE1751173A1 (en) 1971-02-25
US3397550A (en) 1968-08-20

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