US3901308A - Electrical overload control for a combination apparatus - Google Patents

Electrical overload control for a combination apparatus Download PDF

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Publication number
US3901308A
US3901308A US482172A US48217274A US3901308A US 3901308 A US3901308 A US 3901308A US 482172 A US482172 A US 482172A US 48217274 A US48217274 A US 48217274A US 3901308 A US3901308 A US 3901308A
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United States
Prior art keywords
air
space
compressor
unit
demand
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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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US482172A
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English (en)
Inventor
Isaac Berger
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.)
Carrier Corp
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Carrier Corp
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Filing date
Publication date
Application filed by Carrier Corp filed Critical Carrier Corp
Priority to US482172A priority Critical patent/US3901308A/en
Priority to AU79845/75A priority patent/AU487865B2/en
Priority to JP50048524A priority patent/JPS51751A/ja
Application granted granted Critical
Publication of US3901308A publication Critical patent/US3901308A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D29/00—Arrangement or mounting of control or safety devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/12—Circuit arrangements for AC mains or AC distribution networks for adjusting voltage in AC networks by changing a characteristic of the network load
    • H02J3/14—Circuit arrangements for AC mains or AC distribution networks for adjusting voltage in AC networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
    • H02J2310/10—The network having a local or delimited stationary reach
    • H02J2310/12—The local stationary network supplying a household or a building
    • H02J2310/14—The load or loads being home appliances
    • 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]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
    • 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
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • 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
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/242—Home appliances
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/242—Home appliances
    • Y04S20/244—Home appliances the home appliances being or involving heating ventilating and air conditioning [HVAC] units

Definitions

  • ABSTRACT A control for a combination apparatus including an electric water heater and mechanical refrigeration unit employed in an air conditioning system.
  • the control prevents the compressor of the refrigeration unit from operating when the electric water heater is energized even though the temperature demand of the space being conditioned requires cooled air from the air conditioning system.
  • the fan of the system adapted to route air to be conditioned over the evaporator will be selectively energized in response to the temperature demand of the space being conditioned even though the compressor is inoperable due to the energization of the electric water heater.
  • This invention relates to improvements in a control for combination apparatus of the type having an air conditioning unit and another unit, such as an electric water heater requiring heavy power demands.
  • a single packaged unit including apparatus adapted to provide each of the aforementioned functions is highly desirable.
  • the packaged unit or apparatus may be placed in a space such as a closet wherein a minimal of otherwise usable space is used for the unit.
  • Such a unit has been found particularly suitable for use in gardentype apartments or light commercial installations.
  • the fan of the air conditioning system adapted to route air to be conditioned in heat transfer relation with the refrigerant flowing through the evaporator will be selectively energized in response to the cooling demand of the space, even though the compressor ofthe system is maintained inoperable.
  • the circulation of air will provide convective cooling during the period of time when the compressors remain inoperable due to the energization of the other heavy power demand device.
  • the compressor may once again be energized in response to a demand for conditioned air.
  • a combination apparatus including a refrigeration unit of an air conditioning system and a second device, for example an electric water heater, having a relatively heavy power demand.
  • a refrigeration unit of an air conditioning system and a second device, for example an electric water heater, having a relatively heavy power demand.
  • the compressor of the refrigeration unit When the electric water heater element of the water heater is energized in response to a demand for water heating imposed on the water heater, the compressor of the refrigeration unit will be prevented from being energized even though the space being served by the air conditioning system requires cooled air.
  • the fan of the system adapted to circulate air to be cooled in heat trans fer relation with refrigerant passing through the evaporator will be selectively energized in response to the requirements of the space for conditioned air even though the compressor cannot be energized.
  • FIG. I illustrates a combination apparatus including an electric water heater and a refrigeration unit
  • FIG. 2 illustrates schematically a control circuit for the combination apparatus
  • FIG. 3 illustrates a schematic of the refrigeration unit of the combination apparatus.
  • a combination apparatus 10 having an upper housing shell 11 and a lower housing shell 12 secured together by suitable means.
  • Upper housing I] is provided with an opening covered by grill 14 to emit air into the interior of the housing.
  • An arcuately shaped refrigerant evaporator coil 16 is disposed behind grill l4, and a filter element 17 is inserted between the evaporator coil and the grill as shown, or on the outside of the grill, if desired.
  • Evaporator coil 16 forms a portion of a refrigeration unit to be more fully described hereinafter.
  • Liquid refrigerant is supplied to the evaporator through fitting 36 and leaves therefrom as a vapor through fitting 37.
  • a fan 15 is located in upper housing 11 within the arcuate section of evaporator coil [6 for drawing air to be conditioned through grill l4 and filter 17, to thereafter pass in heat transfer relation with the refrigerant flowing through evaporator coil 16.
  • the refrigerant absorbs heat from the air and is vaporized thereby.
  • the air is cooled to a desirable temperature level as a result ofits rejection of heat to the refrigerant.
  • the air is then discharged from fan 15 through a suitable discharge duct which is connected to the joint element 19 formed on the top of the housing.
  • One or more electric space heater elements 20 are provided within the discharge passage 21 of fan 15 for reheating of air being cooled and dehumidified or for providing heating of the air when temperature conditions in a space being served by the apparatus 10 poses a demand on the apparatus for heating.
  • a suitable condensate pan 22 extends from the lower portion of the upper housing I] to remove condensate formed during the passage of air over evaporator 16. The condensate is formed as a result of the cooling of the air below its dew point.
  • Lower housing shell contains a water heater tank which is insulated by a layer of fiberglass 26 or other suitable material from the exterior of the shell, One or more electric hot water heater elements 27 are provided within the interior of water heater tank 25 to provide the required water heating upon the demand therefor.
  • An inlet connection 28 is provided for supplying water to the tank 25 and an outlet connection 29 is provided for discharging heated water from the tank.
  • a drain connection 30 is provided with a suitable valve at the lower portion of tank 25 to allow the tank to be drained, and a pressure relief valve is provided adjacent the top of the tank.
  • a removable access panel 31 is provided in lower housing shell 12 to enable servicing of water heater elements 27. Electric service is provided by connecting an electric power line 34 to a control compartment 32.
  • FIG. 3 there is disclosed a schematic diagram of the refrigeration unit of apparatus 10.
  • the refrigeration unit is employed in an air conditioning system to provide relatively cool air to the space being served by the apparatus.
  • the refrigeration unit includes compression means, shown as a reciprocating type refrigerant compressor 40.
  • High pressure, vaporous refrigerant gas is discharged from reciprocating compressor to line 41.
  • Line 41 communicates with condenser 42.
  • the vaporous refrigerant passes through the condenser where a cooling medium, for example ambient air, is routed thereover by fan 43.
  • the vaporous refrigerant rejects heat to the ambient air and is condensed thereby.
  • the liquid refrigerant leaves condenser 42 and passes through line 44, thermal expansion means 45, shown as a thermal expansion valve and then passes through fitting 36 into evaporator coil l6.
  • air to be cooled is routed over the evaporator coil and thereby rejects heat to the refrigerant gas passing therethrough.
  • the refrigerant gas is vaporized as a result of its absorbing heat from the air and passes via line 46 to the suction side of compressor 40.
  • the refrigeration unit hereinabove described is of a conventional type well known to those skilled in the art.
  • FIG. 2 there is schematically illustrated a preferred embodiment of a control in accordance with the present invention.
  • Line current is provided to the control at terminals 51, 52.
  • the control illustrated in this embodiment includes a two-stage space heater comprising electric space heater elements 53 and 54 and a single-stage electric water heater element 55.
  • a water heater thermostat 56 has a first normally closed switch 57 and a second normally open switch S8, responsive to a sensed demand for water heating imposed on the control.
  • a transformer having a line voltage primary winding 48 and a low voltage secondary winding 59 supplies current for operation of the low voltage components of the control.
  • the low voltage components include a manually selectible heat-cool switch 49 for selecting either heating or air conditioning, as desired. When switch 49 is in a position to pro vide heating, terminals 60 are connected to each other. When switch 49 is in a position to provide air conditioning, terminals 6] are connected to each other as illustrated in the drawing.
  • Room thermostat 62 is located in the space to be conditioned for sensing a heating or cooling demand imposed upon the control.
  • contact 63 ofthermostat 62 is connected to the common terminal as illustrated in the drawing, the space to be cooled is warmer than the set point temperature and a demand for cool ing is indicated.
  • contact 64 of the thermostat is connected to the common terminal.
  • switch 49 is in a heating position, closing of contact 64 of thermostat 62 energizes space heat control relay 66', and when switch 49 is in the cooling position, connecting thermostat contact 63 to the common terminal energizes air conditioning relay 67.
  • a second relay 68 con nected in parallel with air conditioning relay 67 will also be energized when contact 63 is connected to the common terminal.
  • a normally closed switch 69 Connected in series with relay 68, for a reason to be more fully disclosed hereinafter, is a normally closed switch 69.
  • a two-speed electric fan motor 70 having a low speed terminal 71 and a high speed terminal 72, is provided to operate fan 15. As noted previously, fan 15 is provided to route air over evaporator coil 16. Fan [5 will also route air over the electric space heater elements.
  • the low speed terminal 71 of fan motor is in series with normally closed air conditioning relay contact 75 and the high speed terminal 72 of motor 70 is in series with normally open air conditioning relay contact 76. Consequently, fan motor 70 normally runs on low speed during the heating mode of operation and is switched to high speed operation when air conditioning is required and relay 67 is energized.
  • Space heat control relay 66 has a pair of contacts 77, 78 connected thereto.
  • Energization of relay 66 in response to a demand for heating closes contacts 77 and 78 to energize the space heaters.
  • Relay 68 is the main compressor relay, the energization thereof causing compressor 40 of the refrigera tion unit to become operable.
  • switch 58 closes thereby energizing water heater element 55.
  • relay 80 in parallel with water heater element 55 will also be ener gized.
  • the energization of relay 80 will open normally closed switch 69.
  • switch 69 is con nected in series with compressor relay 68. The opening of switch 69 will render the compressor inoperable even though the room thermostat senses a demand for cooling.
  • fan motor 70 will remain energized when the room thermostat senses a demand for relatively cool air to thereby partially satisfy the cooling requirement in the space being conditioned.
  • the circulation of air via the continued operation of the fan motor will provide convective cooling to reduce the discomfort to occupants of the space that might otherwise occur due to the inoperability of the com pressor of the refrigeration unit.
  • the combination apparatus has been particularly described as comprising a mechanical refrigeration unit of a type employed in an air conditioning system and an electric water heater
  • the electric water heater may be replaced by any other device that has a heavy electrical power demand when energized, for example an electrostatic air filter.
  • said air conditioning system including fan means operable to route air to be conditioned in heat transfer relation with refrigerant passing through the refrigeration unit evaporator, the refrigerant absorbing heat and being vaporized thereby;
  • said fan means of said air conditioning system being selectively energized in response to the sensed air temperature even though said compressor is inoperable due to the energization of said heater element, whereby air is circulated in said space served by said air conditioning system.
  • said second unit is an electric water heater having an electric water heater element.
  • the fan of the refrigeration unit being selectively energized to circulate air in the space being conditioned even though the compressor remains deenergized due to the energization of the second unit.
  • a method as set forth in claim 4 further including the step of energizing an electric heater
  • a water heater thermostat having switch means associated therewith adapted to respond to a demand for water heating imposed on said control, said water heating element being connected in an electrical circuit controlled by said water heater thermostat to selectively energize and deenergize said water heater element in response to the sensed demand for water heating;
  • space thermostat means having switch means associated therewith adapted to respond to a demand for space cooling imposed on said control, said refrigeration unit being connected in an electrical circuit controlled by said space thermostat means to energize and deenergize said compressor in response to the sensed demand for space cooling, said air conditioning system further including fan means operable to route air to be cooled in heat transfer relation with refrigerant passing through said evaporator, said fan means also being connected in said electrical circuit controlled by said space thermostat means; and
  • said fans means of said air conditioning system continuing to be selectively energized in response to the sensed air temperature of said space even though said compressor is rendered inoperable due to the energization of said heater element, whereby air is circulated in said space.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Power Engineering (AREA)
  • Air Conditioning Control Device (AREA)
US482172A 1974-06-24 1974-06-24 Electrical overload control for a combination apparatus Expired - Lifetime US3901308A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US482172A US3901308A (en) 1974-06-24 1974-06-24 Electrical overload control for a combination apparatus
AU79845/75A AU487865B2 (en) 1975-04-04 Electrical overload control fora combination apparatus
JP50048524A JPS51751A (enrdf_load_stackoverflow) 1974-06-24 1975-04-21

Applications Claiming Priority (1)

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US482172A US3901308A (en) 1974-06-24 1974-06-24 Electrical overload control for a combination apparatus

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JP (1) JPS51751A (enrdf_load_stackoverflow)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4110827A (en) * 1976-10-29 1978-08-29 Honeywell Inc. Load cycling with space temperature feedback
US4141407A (en) * 1975-07-21 1979-02-27 Briscoe Harry H Power demand limiting circuit
US4147296A (en) * 1977-12-09 1979-04-03 Honeywell Inc. Proportional demand limit controller
US4160153A (en) * 1977-06-24 1979-07-03 Pako Corporation Duty cycle shared proportional temperature control
US4242554A (en) * 1978-05-31 1980-12-30 General Electric Company Effective time ratio browning in a microwave oven employing high thermal mass browning unit
US4263962A (en) * 1977-06-13 1981-04-28 General Electric Company Heat pump control system
US4310770A (en) * 1979-07-25 1982-01-12 Ohio Agricultural Research And Development Center Demand load control
GB2221105A (en) * 1988-05-17 1990-01-24 Samsung Electronics Co Ltd Control circuit for a refrigerator combined with a microwave oven
US4915162A (en) * 1985-09-10 1990-04-10 Sanden Corporation Method and apparatus for heater current control for automatic vending machine
US5036676A (en) * 1990-09-21 1991-08-06 Carrier Corporation Method of compressor current control for variable speed heat pumps
GB2241614A (en) * 1990-03-01 1991-09-04 Gemini Clothescare Ltd Logic circuit for limited power consumed by an appliance having a plurality of loads
US20030000706A1 (en) * 1997-04-07 2003-01-02 Carstensen Kenneth J. High impact communication and control system
US20100146995A1 (en) * 2007-06-01 2010-06-17 David Richard Mathews Air conditioning methods and apparatus
CN109140773A (zh) * 2018-08-14 2019-01-04 珠海格力电器股份有限公司 换热组件及具有该换热组件的整体式热泵热水器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2736844A (en) * 1949-10-10 1956-02-28 Wesley Hicks W Electric load regulator
US3515892A (en) * 1968-04-26 1970-06-02 Us Army Load disabling circuit
US3767894A (en) * 1972-09-18 1973-10-23 Carrier Corp Combination electric water heater and electric space heater

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4516373Y1 (enrdf_load_stackoverflow) * 1968-05-15 1970-07-07

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2736844A (en) * 1949-10-10 1956-02-28 Wesley Hicks W Electric load regulator
US3515892A (en) * 1968-04-26 1970-06-02 Us Army Load disabling circuit
US3767894A (en) * 1972-09-18 1973-10-23 Carrier Corp Combination electric water heater and electric space heater

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4141407A (en) * 1975-07-21 1979-02-27 Briscoe Harry H Power demand limiting circuit
US4110827A (en) * 1976-10-29 1978-08-29 Honeywell Inc. Load cycling with space temperature feedback
US4263962A (en) * 1977-06-13 1981-04-28 General Electric Company Heat pump control system
US4160153A (en) * 1977-06-24 1979-07-03 Pako Corporation Duty cycle shared proportional temperature control
US4147296A (en) * 1977-12-09 1979-04-03 Honeywell Inc. Proportional demand limit controller
US4242554A (en) * 1978-05-31 1980-12-30 General Electric Company Effective time ratio browning in a microwave oven employing high thermal mass browning unit
US4310770A (en) * 1979-07-25 1982-01-12 Ohio Agricultural Research And Development Center Demand load control
US4915162A (en) * 1985-09-10 1990-04-10 Sanden Corporation Method and apparatus for heater current control for automatic vending machine
GB2221105A (en) * 1988-05-17 1990-01-24 Samsung Electronics Co Ltd Control circuit for a refrigerator combined with a microwave oven
GB2221105B (en) * 1988-05-17 1993-01-20 Samsung Electronics Co Ltd Load control circuit for preventing overload of a power supply
GB2241614A (en) * 1990-03-01 1991-09-04 Gemini Clothescare Ltd Logic circuit for limited power consumed by an appliance having a plurality of loads
GB2241614B (en) * 1990-03-01 1994-04-13 Gemini Clothescare Ltd Electrical Logic Circuit for Controlling the Distribution of Power in an Appliance
US5036676A (en) * 1990-09-21 1991-08-06 Carrier Corporation Method of compressor current control for variable speed heat pumps
US20030000706A1 (en) * 1997-04-07 2003-01-02 Carstensen Kenneth J. High impact communication and control system
US20100146995A1 (en) * 2007-06-01 2010-06-17 David Richard Mathews Air conditioning methods and apparatus
CN109140773A (zh) * 2018-08-14 2019-01-04 珠海格力电器股份有限公司 换热组件及具有该换热组件的整体式热泵热水器
CN109140773B (zh) * 2018-08-14 2019-09-20 珠海格力电器股份有限公司 换热组件及具有该换热组件的整体式热泵热水器

Also Published As

Publication number Publication date
AU7984575A (en) 1976-10-07
JPS51751A (enrdf_load_stackoverflow) 1976-01-06

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