EP0031945A2 - Entfrostungssteuervorrichtung für Wärmepumpen - Google Patents

Entfrostungssteuervorrichtung für Wärmepumpen Download PDF

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Publication number
EP0031945A2
EP0031945A2 EP80108162A EP80108162A EP0031945A2 EP 0031945 A2 EP0031945 A2 EP 0031945A2 EP 80108162 A EP80108162 A EP 80108162A EP 80108162 A EP80108162 A EP 80108162A EP 0031945 A2 EP0031945 A2 EP 0031945A2
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EP
European Patent Office
Prior art keywords
outdoor
output
air temperature
counter
outdoor air
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Withdrawn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
EP80108162A
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English (en)
French (fr)
Other versions
EP0031945A3 (de
Inventor
Robert T. Ruminsky
Stephen L. Serber
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.)
Honeywell Inc
Original Assignee
Honeywell 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 Honeywell Inc filed Critical Honeywell Inc
Publication of EP0031945A2 publication Critical patent/EP0031945A2/de
Publication of EP0031945A3 publication Critical patent/EP0031945A3/de
Withdrawn legal-status Critical Current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
    • 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
    • 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
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • F25B47/022—Defrosting cycles hot gas defrosting
    • F25B47/025—Defrosting cycles hot gas defrosting by reversing the cycle

Definitions

  • the invention relates to an outdoor coil defrost control system for a reverse cycle refrigeration apparatus or heat pump for heating and cooling a building and comprising a refrigerant compressor, an indoor coil, an outdoor coil and refrigerant conduits interconnecting said compressor and said coils.
  • the controller has operative connections to the above recited temperature sensors and compressor operation sensor so as to receive the output signals thereof.
  • the controller comprises in part a special variable frequency oscillator having an input adapted to receive a signal indicative of the outdoor air temperature and to generate and output signal the frequency of which varies as a non-linear function of the magnitude of the outdoor air temperature.
  • the controller further comprises a counter having an input connected to receive the output signal of the variable frequency oscialltor. The controller places said heat pump into an outdoor coil defrost mode of operation upon the counter counting a preselected number of counts or pulses.
  • the system comprises outdoor coil temperature sensors having output signals indicative of both the temperature of the outdoor coil and the temperature of outdoor air.
  • the variable frequency oscillator delivers an output signal the frequency of which varies as a non-linear function of the magnitude of the outdoor coil temperature.
  • the controller further comprises a counter having an inp % t connected to receive the output signal of the variable frequency oscillator and finally placing said heat pump into an outdoor coil defrost mode of operation upon the counter means counting a pre-selected number of pulses. of the outdoor air temperature and an output signal the frequency of which varies as a non-linear function of the magnitude of the outdoor air temperature.
  • the special controller further comprises a counter means having an input connected to receive the output signal of the variable frequency oscillator.
  • the special controller comprises means for placing said heat pump system into an outdoor coil defrost mode of operation upon the counter means counting a pre- selected number of counts or pulses.
  • the outdoor coil defrost system comprises outdoor coil temperature sensing means having an output indicative of the temperature of the outdoor coil, means for producing an output signal indicative of the operation of the compression means, and a special controller means.
  • the special controller means has operative connections to the outdoor coil temperature sensor and compression means operation sensor so as to receive the outputs thereof.
  • the special controller comprises in part a special variable frequency oscillator having an input adapted to receive a signal indicative of the outdoor coil temperature and an output signal the frequency of which varies as a non-linear function of the magnitude of the outdoor coil temperature.
  • the special controller further comprises a counter means having an input connected to receive the output signal of the variable frequency oscillator.
  • the special controller comprises means for placing said heat pump system into an outdoor coil defrost mode of operation upon the counter means counting a pre-selected number of counts or pulses.
  • the block diagram of the reverse cycle refrigeration system of the present invention comprises an indoor heat exchange coil 10, an outdoor heat exchange coil 12, a refrigerant compression means or compressor 14 and refrigerant conduit means interconnecting the coils and the compressor, the refrigerant conduit means including a reversing valve 16 having a control 18, an expansion means 20, and appropriate interconnecting piping 21-26.
  • the system as thus far described is old in the art and is exemplified by the above identified patents and application.
  • a brief description of the operation of the system is that during the indoor heating mode, i.e.
  • compressor 14 when the reverse cycle system is operated so as to heat the inside of a building, then compressor 14 will discharge relatively hot gaseous refrigerant through pipe 25, reversing valve 16 and pipe 23 to the indoor heat exchange coil 10 through which heat is provided to the building.
  • the reversing valve 16 is operated so that the hot gaseous refrigerant from the compressor is routed via pipe 25, reversing valve 16 and pipe 24 to the outdoor heat exchange coil.
  • the defrost control system comprises an outdoor air temperature sensing means 30 which will hereinafter sometimes be referred to as "TODAS" and which has an output 31 on which is available an output signal indicative of the outdoor air temperature and which is sometimes hereinafter referred to as "TODA".
  • TODA output 31 is one of two temperature inputs to a special oscillator, counter and controller 40 to be described in more detail below.
  • the defrost control system further comprises outdoor coil temperature sensing means 34 hereinafter sometimes referred to as “TODCS" having an output lead 35 which is symbolic of an output signal indicative of the temperature of the outdoor coil said signal sometimes hereinafter being referred to as "PERMIT".
  • TODAS 30 and the corresponding TODA output 31 may be replaced with an outdoor coil temperature sensing means 330 which will hereinafter sometimes be referred to as "TODCSA” and which has an output 331 on which is avail- I able an output signal indicative of the outdoor coil temperature and which is sometimes hereinafter referred to as "TODCA".
  • T ODCA output 331 replaces TODA output 31 as one of two temperature inputs to controller 40.
  • TODCS and TODCSA may be the same sensor, with a means provided to supply TODCA and PERMIT as separate signals.
  • Compressor 14 is controlled by a controller 15 adapted to be energized from a suitable supply of electric power 17 and to be controlled from a rest "off" position to an operating or “on” condition as a function of receiving command signals from a suitable room thermostat 42 through interconnection means 43; the command signals as is well understood may be either a command for heating or cooling of the space being controlled by the heat pump.
  • the reversing valve 16 is also controlled by a connection means 41 from thermostat 42 so as to be in the appropriate position for the commanded system mode of operation; i.e. heating or cooling.
  • a connection 44 is provided between the controller 15 of the compressor 14 and the special controller 40; the purpose of connection 44 is to provide a signal to controller 40 indicative of whether or not the compressor 14 is running.
  • the special controller 40 has an output connection 50 which is connected to control 18 of the reversing valve 16 which, ae explained above, controls the mode of operation of reverse cycle refrigeration system; more specifically an output from controller 40 via 50 can command the cooling mode of operation as the reverse cycle refrigeration system so as to cause the melting and dispersal of any frost on the outdoor coil 12 which may have accumulated during the prior heating mode of operation.
  • a suitable temperature sensor for TODAS 30 is resistance type temperature sensor model C800A manufactured by Honeywell Inc., Minneapolis, Minnesota. Honeywell Inc. model T872 thermostat may be used for the room thermostat 42, this thermostat being a bi-metal operated mercury switch for heating and cooling applications and further including switch means for controlling a plurality of auxiliary heating means.
  • Honeywell Inc. model L4008C thermostat may be used for TODCS 34, this thermostat being a filled bulb operated switch for temperature sensing applications; a suitable temperature sensor for TODCAS 330 is resistance type temperature sensor model C800B manufactured by Honeywell Inc.; further the functions performed by TODCS 34 and TODCAS 330 may be performed with a single resistance type temperature sensor model C800B manufactured by Honeywell Inc., with suitable electronic circuitry to provide the appropriate signals TODC and TODCA.
  • the room thermostat 42 may be the means for providing the signal applied to connection 44 indicating whether or not the compressor 14 is running.
  • a suitable heat pump which may be used in combination with the present invention is a unit manufactured by the Westinghouse Company comprising an outdoor unit model No. HL036COW and indoor unit AG012HOK.
  • the outdoor coil temperature sensor TODCS 34 is shown in greater detail. More specifically the sensor 34 consists of a temperature sensing bulb 51 which is in thermal contact with the outdoor coil 12, said bulb 51 having a connection 52 to a controller means 53 and thence to a pair of electrical contacts 54 such that a change in the temperature of the outdoor coil 12 causes a corresponding change in the temperature of bulb 51 and a corresponding expansion of the fluid in bulb 51, said expansion being transmitted via connection 52 to controller 53 and thereby causing controller 53 to actuate electrical contacts 54 at a particular value of temperature of outdoor coil 12, hereinafter referred to as the "permit temperature"; such that the closure of electrical contacts 54 causes a current to flow through lines 55 and 56, said current causing amplifies 57 to apply an appropriate "permit" signal to connection 35 to indicate the conditions of outdoor coil 12, i.e. the outdoor coil having a temperature less than the "permit temperature", a representative value of "permit temperature” is 32°F (0°C).
  • a "terminate" signal is developed by a defrost termination means consisting of a defrost termination detection means 61 which provides a signal via connection 62 to controller 63 and thence to a pair of electrical contacts 64 such that the satisfaction of the criteria indicating the need to terminate the defrosting of outdoor coil 12 causes a corresponding signal to be generated at defrost termination detection means 61, said signal being transmitted via connector 62 to controller 63, whereby controller 63 actuates electrical contacts 64 and causes a current to flow through lines 65 and 66, said current causing amplifier 67 to apply an appropriate "terminate" signal to connection 68 to indicate the status of the defrost termination detection means, i.e. outdoor coil 12 being free of frost.
  • Suitable means of detection of defrost termination comprise part of the prior art and are not part of the invention herein described.
  • the compressor controller 15 is depicted as including a coil 15A and a contact 15B which is closed whenever the compressor is energized. Closing of the contact 15B is communicated through leads 44 to a suitable amplifier 70 having an output 71 of a first or "true" sense if the compressor is running and of the opposite sense if the compressor is not running i.e. when contacts 15B are open.
  • the outdoor air temperature sensor 30 supplying the TODA signal via connection 31 to a variable frequency oscillator 80 the output of which is applied via connection 81 to a suitable amplifier 82 having an output 83.
  • the output 83 is a signal the frequency of which varies on a non-linear basis according to the magnitude of the outdoor temperature TODA.
  • FIG. 2 At the bottom of Figure 2 is depicted an alternative to the connection of the outdoor air temperature sensor 30 supplying the TODA signal via connection 31 to a variable frequency oscillator 80, such alternative connection consisting of the outdoor coil temperature sensor TODCSA 330 supplying the TODCA signal via connector 331 to a variable frequency oscillator 80, the output of which is applied via connection 81 to a suitable amplifier 82 having an output 83.
  • the output 83 is a signal, the frequency of which varies on a non-linear basis according to the magnitude of the outdoor coil temperature TODCA.
  • the controller and counter depicted therein comprises in-part a plurality of four bit binary counters which may be type SN7493N manufactured by Texas Instruments, Inc. and others, connected in cascade.
  • each counter produces an output on terminal Q D at 1/16 the frequency of the input applied to the terminal A thereof.
  • the output of the second or the following counter is at 1/16 the frequency of the output of the first one or 1/256 the frequency of the first counter's input.
  • This cascading technique may be used to convert an oscillator with a frequency of several kilohertz or megahertz to a signal with a period of several hours.
  • counter Cl C2 and CN are depicted each having several terminals, six of which are shown: A, QA, B, QD, Ro(l), Ro(2). Other terminals are omitted for clarity.
  • the terminal QD of counter Cl is connected via 90 to terminal A of counter C2 and terminal QD of counter C2 is connected via 91 to successive stages of counters until eventually an input 92 is applied to the final four bit counter CN.
  • the terminals QA and B are interconnected as at 95.
  • the output of oscillator 80 is applied via 83, a gate 100 and a connection 101 to terminal A of counter Cl whenever gate 100 is enabled, this being controlled by a first input which is the output 71 from the compressor running detector means depicted in Figure 2 and by a second input which is the output 130 of inverter 129, said gate 100 causing the output signal on connector 101 to have a frequency signal to the frequency of the signal of the oscillator whenever both said first input and said second input are in the logical "true" state.
  • Inverter 129 in turn receives an input via connection 128 from the output of counter CN such that the output of inverter 129 is the logical negation of the output of counter CN.
  • the output from oscillator 80 is permitted to flow via 83 and through the gate 100 so as to be counted by the counting means when both a compressor running signal is present at the output 71 of amplifier 70 and the last output 128 on the QD terminal of counter CN is a logical "false", i.e. the compressor is running and the counter has not counted a sufficient number of cycles to indicate a need for defrosting.
  • Each stage C 1 , C 2 ...CN of the counter has two reset terminals R 0 (1) and R O (2) which, upon the input signal on connection 111 being a logical "true” state causes the counter to reset to its initial state, said input signal being a logical "true” when either 1) a defrost terminate signal is detected as a logical "true” signal on connection 68 from amplifier 67, depicted on Figure 2, or 2) both inputs of gate 105 are in the logical "true” state, corresponding to the outputs on connection 130 from inverter 129 and the output on connection 106 from inverter 59.
  • the signal on connection 68 is a logical "true” whenever the conditions are proper to terminate defrosting of the outdoor coil.
  • the signal on connection 106 is a logical "true” when the output of inverter 59 is true, the output of inverter 59 being the logical negation of the signal on connection 35 which is the output of amplifier 57, i.e. the signal on connection 35 is a logical "true” whenever TODC is less than the "permit temperature", i.e. the output of inverter 59 is a logical "true” when TODC is greater than the "permit temperature”.
  • the output terminal QD of the final stage CN of the counter means is connected through a connecting lead 50 (see also Figure 1) to the control 18 of the reversing valve 16 of the heat pump system.
  • a connecting lead 50 see also Figure 1
  • an amplifier 121 receiving the output from counter unit CN the output of the amplifier 121 is shown to be connected to a contactor unit 123 comprising a coil 124 connected at one end to amplifier 121 and to ground at the other end and adapted when energized to actuate contacts 125 which are symbolic of means for actuating the reversing valve 16.
  • the counter and controller depicted in Figure 3 operate to accumulate a count of cycles of oscillator 80 under conditions of frost accumulation on outdoor coil 12.
  • the conditions for accumulation of a count of said cycles are: 1) the compressor 14 is operating, 2) the heat pump is not defrosting 3) a signal to reset the counter is not present.
  • a signal to reset the counter is present under one of the following conditions: 1) the heat pump is not defrosting and TODC is not less than the "permit temperature", or 2) the heat pump is defrosting and the conditions for termination of defrosting are satisfied.
  • variable frequency oscillator 80 is shown in greater detail.
  • the outdoor temperature sensor (TODAS) 30 is depicted as having an output signal TODA on connection 31 which provides a linearly varying voltage with outdoor air temperature.
  • the outdoor coil temperature sensor TODCS 330 is depicted as having an output signal TODCA on connection 331 which provides a linearly varying voltage with outdoor coil temperature.
  • the oscillator 80 further comprises an operational amplifier 160 having non-inverting terminal 162 and an inverting terminal 161 as well as an output 163.
  • a positive feedback resistor 164 is connected between 163 and 162; and the output TODAS 30 is applied to the non-inverting terminal 162 of operational amplifier 160 through a resistor network 166, 173 and 174.
  • a resistor 176 is connected between terminal 170 and input terminal 161 of amplifier 160 and yet another resistor 177 is connected between 161 and ground 153.
  • a capacitor 181 is connected between terminal 161 and ground 153.
  • a resistor 184 and a diode 185 are connected in series between output lead 81 of the oscillator and junction point 161 and an oppositely poled diode 187 and a resistor 186 are also connected between lead or output 81 and junction point 5 161.
  • Resistors 184 and 186, diodes 185 and 187 and capacitor 181 comprise a negative feedback network for amplifier 160.
  • the operation of the oscillator 80 is based upon the use of the operational amplifier 160 as a voltage comparator.
  • the input terminals 161 and 162 have a high impedance. When 0 the voltage at the non-inverting terminal 162 exceeds the voltage at the inverting terminal 161 then the voltage at the output 163 or 81 goes to the level of the supply voltage 170. When the voltage at the negative terminal 161 exceeds the voltage at the positive terminal 162 then the output voltage at 5 81 goes to zero.
  • the circuit is caused to oscillate by establishing switch points on the positive terminal 162 and then charging and discharging the capacitor of 181 to sweep the negative terminal 161 voltage back and forth past the switch points. To further describe the operation of the oscillator,
  • the device is in operation and then the events which occur may be described by selecting a starting point and then noting the events which sequentially occur to return to the same starting point.
  • the selected_ starting condition is just before the output switches from low to high.
  • the "low reference point" is established on the non-inverting terminal 162 as determined by nodal analysis for resistors 173, 174 and 164 and the voltage at node 163 at zero volts. Because the output voltage at 163 is low and is about to switch high, the negative terminal voltage at 161 is slightly above the low reference point.
  • Capacitor 181 is discharging through resistor 186 and zener diode 187 which causes the negative terminal voltage to drop.
  • capacitor 181 discharges such that the inverting terminal voltage 161 is less than the non-inverting terminal voltage at 162 then the output voltage at 163 swings high i.e. to the level of the supply voltage at 170. Because the voltage across capacitor 181 does not change instanteously then the voltage at the inverting terminal 161 remains unchanged but the voltage at the non-inverting terminal is increased due to the contribution of the increased voltage at node 163 to the voltage at node 162.
  • the capacitor 181 then begins charging through diode 185 and resistor 184 thus raising the voltage at the inverting terminal 161 until it reaches the high reference voltage when the inverting terminal voltage exceeds the non-inverting terminal voltage, output voltage at node 163 goes low and capacitor 181 discharges through resistor 186 and diode 187 for it to return to the starting point.
  • Capacitor 181 charges and discharges at an exponential rate; because of this the rate of charging and discharging about the low and high switch point varies depending upon the average of the two switch points (assuming the difference in the switch points is constant).
  • oscillator 80 is designed so that the frequency of oscillation will peak or be at a maximum at a preselected value of outdoor air temperature and drop off at values either greater or lesser than such value. This is depicted in Figure 6 where the reference numerical 190 is used to identify a graph of oscillator frequency plotted as a function of outdoor air temperature.
  • oscillator 80 has a maximum frequency at an input thereto which corresponds to a preselected outdoor air temperature; such temperature is selected to be that which had been predetermined to require a maximum number of daily defrost cycles of the heat pump system (when operated in the heating mode).
  • reference numeral 195 identifies a plot of the voltage applied to the input of amplifier 152 of oscillator 80 (see Figure 5) as a function of the magnitude of outdoor air temperature.
  • graph 190 of Figure 6 is also representative as the number of daily defrost cycles, i.e., a preselected schedule of defrost cycles of the heat pump system when used in the heating mode.
  • the rate of change in frequency of the oscillator can be adjusted by varying the charging of the capacitor and discharging of the capacitor by adjusting the values of resistors 184 and 186.
  • variable frequency oscillator 80 will have a maximum frequency of oscillation at a preselected value of outdoor air temperature, preferably approximately 0° Celsius or alternatively at a preselected value of outdoor coil temperature corresponding to an outdoor air temperature of 0° Celsius typically -5.5°C (22 0 F) , and as the outdoor air temperature or alternatively outdoor coil temperature deviates from said preselected value the frequency of the oscillator will decrease as depicted in Figure 6.
  • a graph-300 depicts the variation between the number of daily defrost cycles and outdoor coil temperatures; it will be observed that the peak defrost requirement occurs at about 22°F.
  • the reference numeral 305 designates the voltage applied to the input of the oscillator
  • graph 300 is also representative of the desired frequency output of the oscillator as a function of outdoor coil temperature.
  • the reference numeral 200 identifies a "system on" entry point flowing into a junction 201 which flows to an instruction block 202 "clear counter" the flow from which is through a junction 203 to a logic instruction block 204 "TODC is less than Tpermit?" having a "no" response 205 connected to junction 201 and a “yes” response 206 connected to logic instruction block 207 !'compressor running?" having a "no” response 208 connected to an operation or instruction block 209 “turn off counter,” and a “yes” response 210 connected to an operational instruction block 214 “turn on counter” flow from which is applied to a junction 215 which also receives the flow from instruction block 209; flow from junction 215 is to a logic instruction block 222 "count complete?"having a "no” response connected to junction 203 and a “yes” response connected to another operation or instruction block 224 "place heat pump in defrost mode" flow from which is to
  • the non-linear relationship between TODA and the output frequency of oscillator 80 is specifically tailored to the preselected relationship between TODA and the number of daily defrost cycles required for a heat pump system to obtain optimum performance.
  • the output frequency of oscillator 80 varies as shown in Figure 6 to cause either an increase or decrease in the frequency of the defrost cycle.
  • the non-linear relationship between TODCA and the output frequency of oscillator 80 is specifically tailored to the preselected relationship between TODCA and the number of daily defrost cycles required for a heat pump system to obtain optimum performance.
  • the output frequency of oscillator 80 varies as shown for a typical heat pump in Figure 7 to cause either an increase or decrease in the frequency of the defrost cycle.

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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)
  • Air Conditioning Control Device (AREA)
EP80108162A 1980-01-04 1980-12-23 Entfrostungssteuervorrichtung für Wärmepumpen Withdrawn EP0031945A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10974380A 1980-01-04 1980-01-04
US109743 1980-01-04

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EP0031945A2 true EP0031945A2 (de) 1981-07-15
EP0031945A3 EP0031945A3 (de) 1982-05-19

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2492070A1 (fr) * 1980-10-14 1982-04-16 Gen Electric Dispositif de commande de degrivrage pour une pompe a chaleur
EP0271428A2 (de) * 1986-12-04 1988-06-15 Carrier Corporation Abtausteuerung für Wärmepumpen mit regelbarer Geschwindigkeit
AU606826B2 (en) * 1989-04-07 1991-02-14 Mitsubishi Jukogyo Kabushiki Kaisha Refrigerating apparatus
EP2743615A1 (de) * 2012-12-14 2014-06-18 Whirlpool Corporation Verfahren zur Steuerung der Entfrostung eines Verdampfers in einer Kühlanwendung
CN105004000A (zh) * 2015-06-29 2015-10-28 宁波奥克斯电气有限公司 变频空调机制热运行时的除霜控制方法
CN115342481A (zh) * 2022-08-16 2022-11-15 宁波奥克斯电气股份有限公司 一种空调器的控制方法、控制装置和空调器

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115183401B (zh) * 2022-06-30 2023-07-14 海信空调有限公司 空调器和空调器除霜控制方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3466888A (en) * 1968-05-15 1969-09-16 Westinghouse Electric Corp Defrost controls for heat pumps
US3894404A (en) * 1974-07-29 1975-07-15 Honeywell Inc Hot gas defrost refrigeration system
FR2367997A1 (fr) * 1976-10-15 1978-05-12 Borg Warner Dispositif de commande pour la regulation du fonctionnement d'une pompe a chaleur
US4132085A (en) * 1973-06-20 1979-01-02 Hitachi, Ltd. Control apparatus including an electronic timer
US4209994A (en) * 1978-10-24 1980-07-01 Honeywell Inc. Heat pump system defrost control

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5031842Y2 (de) * 1971-07-08 1975-09-17
JPS5323053B2 (de) * 1973-10-29 1978-07-12

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3466888A (en) * 1968-05-15 1969-09-16 Westinghouse Electric Corp Defrost controls for heat pumps
US4132085A (en) * 1973-06-20 1979-01-02 Hitachi, Ltd. Control apparatus including an electronic timer
US3894404A (en) * 1974-07-29 1975-07-15 Honeywell Inc Hot gas defrost refrigeration system
FR2367997A1 (fr) * 1976-10-15 1978-05-12 Borg Warner Dispositif de commande pour la regulation du fonctionnement d'une pompe a chaleur
US4209994A (en) * 1978-10-24 1980-07-01 Honeywell Inc. Heat pump system defrost control

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2492070A1 (fr) * 1980-10-14 1982-04-16 Gen Electric Dispositif de commande de degrivrage pour une pompe a chaleur
EP0271428A2 (de) * 1986-12-04 1988-06-15 Carrier Corporation Abtausteuerung für Wärmepumpen mit regelbarer Geschwindigkeit
EP0271428A3 (en) * 1986-12-04 1990-01-31 Carrier Corporation Defrost control for variable speed heat pumps
AU606826B2 (en) * 1989-04-07 1991-02-14 Mitsubishi Jukogyo Kabushiki Kaisha Refrigerating apparatus
EP2743615A1 (de) * 2012-12-14 2014-06-18 Whirlpool Corporation Verfahren zur Steuerung der Entfrostung eines Verdampfers in einer Kühlanwendung
US9551523B2 (en) 2012-12-14 2017-01-24 Whirlpool Corporation Method for controlling the defrost of an evaporator in a refrigeration appliance
CN105004000A (zh) * 2015-06-29 2015-10-28 宁波奥克斯电气有限公司 变频空调机制热运行时的除霜控制方法
CN105004000B (zh) * 2015-06-29 2017-11-07 宁波奥克斯电气股份有限公司 变频空调机制热运行时的除霜控制方法
CN115342481A (zh) * 2022-08-16 2022-11-15 宁波奥克斯电气股份有限公司 一种空调器的控制方法、控制装置和空调器

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EP0031945A3 (de) 1982-05-19
JPS56102638A (en) 1981-08-17

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