GB2016174A - Frost and temperature control system - Google Patents

Frost and temperature control system

Info

Publication number
GB2016174A
GB2016174A GB7901901A GB7901901A GB2016174A GB 2016174 A GB2016174 A GB 2016174A GB 7901901 A GB7901901 A GB 7901901A GB 7901901 A GB7901901 A GB 7901901A GB 2016174 A GB2016174 A GB 2016174A
Authority
GB
United Kingdom
Prior art keywords
frost
temperature
evaporator coil
control apparatus
output
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.)
Withdrawn
Application number
GB7901901A
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.)
Duracell Inc USA
Original Assignee
PR Mallory and Co Inc
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 PR Mallory and Co Inc filed Critical PR Mallory and Co Inc
Publication of GB2016174A publication Critical patent/GB2016174A/en
Withdrawn legal-status Critical Current

Links

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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/002—Defroster control
    • F25D21/006—Defroster control with electronic control circuits
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1927—Control of temperature characterised by the use of electric means using a plurality of sensors
    • G05D23/193—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces
    • G05D23/1935—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces using sequential control

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Combustion & Propulsion (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Chemical & Material Sciences (AREA)
  • Remote Sensing (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Defrosting Systems (AREA)
  • Control Of Temperature (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Abstract

A control apparatus for use with heat pumps, especially refrigeration systems to maintain a desired ambient temperature within an environment and a frost-free condition on an evaporator coil of the system. The control apparatus Figure 3 includes ambient temperature sensing circuits 160, 180 responsive to the temperature of a refrigerated chamber and evaporator coil respectively. The circuits 160, 180 each produce a "1" output when the chamber temperature is above a desired level and the evaporator coil temperature is below melting point level respectively. A frost sensor 150, which may be capacitive, produces a "0" output when frost build-up is excessive. A logic circuit 130 responds to these outputs to control relays 118, 120 whereby the defrosting means 116 and heat transferring cooling means 114 cannot be in an activated state at the same time. <IMAGE>
GB7901901A 1978-03-09 1979-01-18 Frost and temperature control system Withdrawn GB2016174A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US88499378A 1978-03-09 1978-03-09

Publications (1)

Publication Number Publication Date
GB2016174A true GB2016174A (en) 1979-09-19

Family

ID=25385895

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7901901A Withdrawn GB2016174A (en) 1978-03-09 1979-01-18 Frost and temperature control system

Country Status (5)

Country Link
JP (1) JPS54121447A (en)
AU (1) AU4348979A (en)
DE (1) DE2842985A1 (en)
FR (1) FR2419482A1 (en)
GB (1) GB2016174A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0644386A1 (en) * 1993-09-22 1995-03-22 Whirlpool Europe B.V. Method and device for dynamically controlling frost formation on a refrigerator evaporator

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116719365B (en) * 2023-07-03 2024-06-21 深圳海关食品检验检疫技术中心 PCR temperature control device and control method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0644386A1 (en) * 1993-09-22 1995-03-22 Whirlpool Europe B.V. Method and device for dynamically controlling frost formation on a refrigerator evaporator

Also Published As

Publication number Publication date
AU4348979A (en) 1979-09-13
DE2842985A1 (en) 1979-09-13
JPS54121447A (en) 1979-09-20
FR2419482A1 (en) 1979-10-05

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)