CN112283992A - Double-system heat pump defrosting method, computer storage medium and double-system heat pump unit - Google Patents
Double-system heat pump defrosting method, computer storage medium and double-system heat pump unit Download PDFInfo
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- CN112283992A CN112283992A CN202011179206.7A CN202011179206A CN112283992A CN 112283992 A CN112283992 A CN 112283992A CN 202011179206 A CN202011179206 A CN 202011179206A CN 112283992 A CN112283992 A CN 112283992A
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- heat pump
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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
- 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
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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
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
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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
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/01—Timing
Abstract
The invention relates to a double-system heat pump defrosting method, which comprises the steps of detecting whether one group of heat pump systems of a double-system heat pump meets a first defrosting condition, detecting whether the other group of heat pump systems of the double-system heat pump meets a second defrosting condition, controlling the double-system heat pump to enter a double-system defrosting mode if the other group of heat pump systems of the double-system heat pump meets the second defrosting condition, controlling the double-system heat pump to enter a single-system defrosting mode if the other group of heat pump systems does not meet the second defrosting condition, and exiting after defrosting is finished, wherein the second defrosting condition is. When the condition that the dual-system heat pump meets the condition of entering the single-system defrosting mode but does not meet the condition of entering the dual-system defrosting mode is detected, the system meeting the condition of entering the defrosting mode is enabled to enter defrosting, the system not meeting the condition of entering the defrosting mode is shut down to wait, so that the condition that two systems enter frostless defrosting which occurs when defrosting and energy consumption is increased is avoided, and when the condition that the dual-system heat pump unit meets the condition of entering the dual-system defrosting is detected, the dual-system heat pump is controlled to enter the dual-system defrosting, so that.
Description
Technical Field
The invention relates to the technical field of heat pumps, in particular to a double-system heat pump defrosting method, a computer storage medium and a double-system heat pump unit.
Background
Regarding the dryer of the dual-system heat pump unit, the equipment manufacturer rarely and specially provides a control strategy for defrosting the dryer of the dual-system heat pump unit sharing the heat exchange fan, and at present, the following two methods are usually adopted:
the method comprises the following steps: as long as one system meets the condition of entering defrosting, the two systems simultaneously enter defrosting, and after the defrosting is finished, the two systems enter heating operation again, so that the method can lead the systems which do not meet the defrosting condition to have frostless defrosting, and the energy loss to be increased;
the second method comprises the following steps: the two systems respectively judge conditions for entering defrosting, when one system meets the condition for entering defrosting, the system meeting the condition for entering defrosting enters defrosting, the other system stops for waiting, after defrosting is finished, the two systems enter heating operation again, the method can cause the condition that one system is seriously frosted to influence the heating operation, but the other system has frosting which does not influence the heating operation, the condition can cause that after defrosting of one system is finished, the heating operation is not stable, the frosting of the other system is worsened, and then the other system enters defrosting next, so that the defrosting time of a unit is overlong, and the heating operation is influenced.
Disclosure of Invention
The invention aims to provide a double-system heat pump defrosting method to judge whether a double-system heat pump unit enters double-system defrosting or single-system defrosting.
When detecting that one group of heat pump systems of the double-system heat pump meets a first defrosting condition, detecting whether the other group of heat pump systems of the double-system heat pump meets a second defrosting condition, if so, controlling the double-system heat pump to enter a double-system defrosting mode, if not, controlling the double-system heat pump to enter a single-system defrosting mode, and exiting after defrosting is finished, wherein if the first defrosting condition is met, the second defrosting condition is necessarily met.
Further, the single-system defrosting mode is that the heat pump system meeting the first defrosting condition enters the defrosting mode, and the other heat pump system stops waiting.
Further, the dual-system defrosting mode is that the heat pump system meeting the first defrosting condition enters defrosting first, and after the heat pump system finishes defrosting, the other group of heat pump system is started to enter defrosting.
Further, the first defrosting condition comprises severe frosting of the system, the second defrosting condition comprises moderate frosting of the system, the severe frosting of the system is represented by that the frosting degree has negative influence on the heating of the system, and the moderate frosting of the system is represented by that the frosting phenomenon exists but the frosting degree has no negative influence on the heating of the system.
Further, the first defrosting condition and the second defrosting condition each include a heating accumulated operation time > DI of the heat pump system, and a compressor continuous operation time > DTCcom of the heat pump system, where DI and DTcom are set values empirically obtained,
if the defrosting is carried out on the system after the double-system heat pump is started, the heating accumulated running time refers to the time from the current time to the last defrosting of the system, and if the defrosting is not carried out on the system after the double-system heat pump is started, the heating accumulated running time refers to the time from the current time to the starting.
Further, the severe frosting of the system is a low pressure saturation temperature T < DST corresponding to the low pressure of the system, DST is a set value determined according to hardware parameters of the dual-system heat pump, the moderate frosting of the system is a low pressure saturation temperature T corresponding to the low pressure of the system is less than or equal to DST plus Δ DST, and Δ DST is a set value determined according to the hardware parameters of the dual-system heat pump and the ambient temperature.
Further, when the dual-system heat pump unit enters a single-system defrosting mode or a dual-system defrosting mode, the condensing fan of the dual-system heat pump unit is controlled to keep running at a low speed.
Further, the double-system heat pump unit controls the evaporation fan to run at a high speed for a set time after defrosting is finished.
There is also provided a computer storage medium storing a computer program which, when executed by a processor, implements the method as described above.
Still provide a dual system heat pump set, this dual system heat pump set includes: comprises a first compressor, a first four-way valve, a first low-pressure sensor, a first gas-liquid separator, a first electronic expansion valve, a double-flow-path condenser, a condensing fan, a second electronic expansion valve, a second gas-liquid separator, a second low-pressure sensor, a second four-way valve, a second compressor, an evaporating fan, a double-flow-path evaporator and an outdoor environment temperature sensor for detecting the outdoor temperature,
the exhaust port of the first compressor is connected with the first interface of the first four-way valve, the second interface of the first four-way valve passes through the first flow path of the double-flow-path condenser and then sequentially passes through the first electronic expansion valve and the first flow path of the double-flow-path evaporator and then is connected with the third interface of the first four-way valve, the fourth interface of the first four-way valve passes through the first gas-liquid separator and then is connected with the suction port of the first compressor, the first low-pressure sensor is positioned on the low-pressure pipe of the first gas-liquid separator to detect the pressure of the low-,
the exhaust port of the second compressor is connected with a second interface of a second four-way valve, a first interface of the second four-way valve passes through a second flow path of the double-flow-path condenser and then sequentially passes through a second electronic expansion valve and a second flow path of the double-flow-path evaporator and then is connected with a third interface of the second four-way valve, a fourth interface of the second four-way valve passes through a second gas-liquid separator and then is connected with a suction port of the second compressor, a second low-pressure sensor is positioned on a low-pressure pipe of the second gas-liquid separator to detect the pressure of the low-,
the evaporation fan is used for supplying air for the double-flow-path evaporator, and the condensing fan is used for supplying air for the double-flow-path condenser, and the evaporator further comprises:
a controller; and the number of the first and second groups,
a memory arranged to store computer executable instructions which, when executed, cause the controller to implement a method as described above.
Has the advantages that:
when the condition that the dual-system heat pump meets the condition of entering the single-system defrosting mode but does not meet the condition of entering the dual-system defrosting mode is detected, the system meeting the condition of entering the defrosting mode is enabled to enter defrosting, the system not meeting the condition of entering the defrosting mode is shut down to wait, so that the condition that two systems enter frostless defrosting which occurs when defrosting and energy consumption is increased is avoided, and when the condition that the dual-system heat pump unit meets the condition of entering the dual-system defrosting is detected, the dual-system heat pump is controlled to enter the dual-system defrosting, so that.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic diagram of a hardware configuration of a dual-system heat pump unit according to the present invention;
FIG. 2 is a schematic diagram of a single system defrost sequence of the present invention;
FIG. 3 is a schematic diagram of a dual system defrost sequence of the present invention;
FIG. 4 is a schematic view of a control loop structure of the heat pump unit of the present invention;
FIG. 5 is a schematic diagram of a computer storage medium according to the present invention.
Detailed Description
The control method of the embodiment is used for controlling a dual-system heat pump unit shown in fig. 1, and the system is used for drying materials placed indoors and comprises a first compressor 1, a first four-way valve 2, a first low-pressure sensor 3, a first gas-liquid separator 4, a first filter 5, a first electronic expansion valve 6, a second filter 7, a dual-flow-path condenser 8, a condensing fan 9, an electric heater 10, a third filter 11, a second electronic expansion valve 12, a fourth filter 13, a second gas-liquid separator 14, a second low-pressure sensor 15, a second four-way valve 16, a second compressor 17, a second outdoor coil temperature sensor 18, an evaporating fan 19, a dual-flow-path evaporator 20 and a first outdoor coil temperature sensor 21.
The exhaust port of the first compressor 1 is connected with a first interface of a first four-way valve 2, a second interface of the first four-way valve 2 passes through a first flow path of a double-flow-path condenser 8 and then sequentially passes through a second filter 7, a first electronic expansion valve 6, a first filter 5 and a first flow path of a double-flow-path evaporator 20 and then is connected with a third interface of the first four-way valve 2, a fourth interface of the first four-way valve 2 passes through a first gas-liquid separator 4 and then is connected with an air suction port of the first compressor 1, so that a first heat pump unit system is formed, a first outdoor coil temperature sensor 21 for acquiring the coil temperature of the first heat pump unit system is arranged on the first flow path of the double-flow-path evaporator 20, and a first low-pressure sensor 3 for detecting the low-pressure value of the first heat pump unit system is arranged on the low-pressure pipe of the.
Similarly, the exhaust port of the second compressor 17 is connected to the first interface of the second four-way valve 16, the second interface of the second four-way valve 16 passes through the second flow path of the dual-flow path condenser 8 and then sequentially passes through the third filter 11, the second electronic expansion valve 12, the fourth filter 13 and the second flow path of the dual-flow path evaporator 20 and then is connected to the third interface of the second four-way valve 16, the fourth interface of the second four-way valve 16 passes through the second gas-liquid separator 14 and then is connected to the suction port of the second compressor 17, thereby forming a second heat pump unit system, the second flow path of the dual-flow path evaporator 20 is provided with a second outdoor coil temperature sensor 18 for acquiring the coil temperature of the second heat pump unit system, and the low-pressure pipe of the second gas-liquid separator 14 is provided with a second low-pressure sensor 15 for detecting the low-pressure value of the second heat pump unit.
The first heat pump unit system and the second heat pump unit system form a complete dual-system heat pump unit, the evaporation fan 19 is used for supplying air to the dual-flow-path evaporator 20, and the condensation fan 9 is used for supplying air to the dual-flow-path condenser 8, so that the operation efficiency of the dual-system heat pump unit is improved. Further, an outdoor ambient temperature sensor (not shown) is provided to detect an outdoor ambient temperature, and an indoor temperature sensor (not shown) is provided to detect an indoor actual temperature.
During heating operation, taking the first heat pump unit as an example, a high-temperature and high-pressure refrigerant is connected to the first loop of the double-loop condenser 8 from the exhaust port of the first compressor 1 through the first four-way valve 2, the refrigerant after heat dissipation in the first loop of the double-loop condenser 8 is delivered to the first electronic expansion valve 6 for throttling and pressure reduction, the reduced-pressure low-temperature and low-pressure refrigerant is delivered to the first loop of the double-loop evaporator 20 for heat absorption, and the heat-absorbed refrigerant returns to the air inlet of the first compressor 1 through the first four-way valve 2 and the first gas-liquid separator 4.
When one of the heat pump units in the dual-system heat pump unit detects that the following three conditions are simultaneously met, the frosting of the system is described:
A. heating accumulated operation time > DI, if the system performs defrosting after the dual-system heat pump is started, the heating accumulated operation time refers to the time between the start of the system and the last defrosting, if the system does not perform defrosting after the dual-system heat pump is started, the heating accumulated operation time refers to the time between the start of the dual-system heat pump, DI is a system set value related to system characteristics, the system characteristics refer to system hardware parameters such as the type of refrigerant and compressor parameters adopted by the system, and for example, the DI value in the embodiment is set to 60 min;
B. compressor continuous operation time > DTCom, satisfying which indicates that the system heating capacity is reduced, it is difficult to maintain the internal temperature, which is likely to be related to the occurrence of frost on the coil, which is related to condition a, if not, long-time operation of the compressor may be to raise the temperature in the room, DTCom is related to the system characteristics of the system, which is set to 10min in the present embodiment;
C. the low-pressure saturation temperature T corresponding to the low-pressure of the system is less than or equal to DST, the saturation temperature refers to the temperature of the refrigerant when liquid and gas of the refrigerant are in dynamic balance under the pressure, the relation between the low-pressure saturation temperature T and the low-pressure of the system is related to the type of the refrigerant, the condition is met, the low-pressure of the system is too low, the DST value is possibly caused by serious frosting or even icing of the system, and the DST value is related to the ambient temperature, for example, when the ambient temperature is-5 ℃, the DST value is-.
At this time, whether the other system meets the following three conditions is detected:
A. cumulative operating time for heating > DI;
B. compressor continuous run time > DTCom;
D. the low pressure saturation temperature T corresponding to the low pressure of the system is less than or equal to DST + Δ DST, if the condition is satisfied, it is indicated that the system is frosted slightly, although the defrosting condition is not reached, continuous defrosting of the dual-system heat pump may occur if defrosting is not performed, the value of Δ DST is related to the system characteristic and the current outdoor environment temperature, and in the case of determining the system characteristic, the lower the outdoor environment temperature is, the smaller the Δ DST is, the table relating Δ DST to the environment temperature in the present embodiment is given below,
| ambient temperature | >0 | [0,-5) | [-5,-10) | [-10,-15] | <-15 |
| △DST | 3 | 2.5 | 2 | 1.5 | 1 |
It is worth noting that the condition CD for entering defrost can be given instead as follows:
C. the temperature of the outdoor coil pipe of the system is less than or equal to DST;
D. the temperature of the outdoor coil pipe of the system is less than or equal to DST plus delta DST.
However, when the temperature of the outdoor coil of the system is used as a basis for judging the defrosting condition, the judgment of the frosting amount is more inaccurate, and therefore, the judgment is only used as a secondary selection.
And if one system meets ABC and the other system meets ABD, the two systems simultaneously enter defrosting, if one system meets the condition ABC and the other system does not meet ABD, the system meeting the condition enters defrosting, and the system not meeting the condition stops waiting.
Referring to fig. 2, taking an example that the first heat pump system satisfies ABC and the second heat pump system does not satisfy ABD, when it is detected that the first heat pump system satisfies ABC and the second heat pump system does not satisfy ABD, a single-system defrosting mode is entered, both the first compressor 1 and the second compressor 17 stop operating, the condensing fan 9 is switched to low-speed operation, the first electronic expansion valve 6 is adjusted to a set defrosting opening 400B, the second electronic expansion valve 12 is adjusted to a set initial opening 300B, after entering defrosting T1, the first four-way valve 2 is reversed, the evaporating fan 19 stops operating, and after entering defrosting T2, the first compressor 1 starts operating.
At this time, the first compressor 1 delivers the high-temperature and high-pressure refrigerant from the exhaust port to the dual-flow evaporator 20 through the first four-way valve 2 to perform heat release and defrost, the refrigerant after heat release is throttled and depressurized by the first electronic expansion valve 6 and then enters the dual-flow condenser 8 to absorb heat, and the refrigerant after heat absorption returns to the suction port of the first compressor 1 through the first four-way valve 2 and the first gas-liquid separator 4 to complete a primary defrost cycle.
When the system meets the defrosting exit condition, the evaporation fan 19 continuously operates for T3 time to blow dry water generated by frost melting on the double-flow-path evaporator 20, secondary frosting is avoided, after the evaporation fan 19 operates for T3 time, the first four-way valve 2 is reversed, the system exits defrosting, and the heating operation is switched.
Referring to fig. 3, taking an example that the first heat pump system satisfies the condition ABC and the second heat pump system satisfies the condition ABD, when it is detected that the first heat pump system satisfies the condition ABC and the second heat pump system satisfies the condition ABD, the dual-system defrost mode is entered, the first compressor 1 and the second compressor 17 are both stopped, the condensing fan 9 is switched to low-speed operation, the first electronic expansion valve 6 and the second electronic expansion valve 12 are both adjusted to defrost opening, after the defrost mode is entered for time T1, the first four-way valve 2 is reversed, the evaporating fan 19 is stopped, after the defrost mode is entered for time T2, the first compressor 1 is started to operate, the second four-way valve 16 is reversed, when it is detected that the first heat pump system satisfies the defrost exit condition, the first compressor 1 is stopped to operate, after it is detected that the first heat pump system satisfies the defrost exit condition T3, the first four-way valve 2 is reversed, the first electronic expansion valve 6, and the second compressor 17 is started to operate, when the second heat pump system is detected to meet the defrosting exit condition, the evaporation fan 19 operates at a high speed for T4 time, then the second four-way valve 16 is reversed, the system exits defrosting and is switched to heating operation.
During the defrosting operation of the dual heat pump system, in order to keep the indoor temperature stable, the value of the indoor actual temperature is monitored in real time, when the value of the indoor actual temperature is detected to be smaller than the set temperature set by a user, the electric heater 10 is started, and the electric heater 10 is used as an indoor heat supply facility during the defrosting operation of the dual heat pump system to keep the indoor temperature stable.
It should be noted that in this embodiment, a method of defrosting before a system with severe frost formation and a method of defrosting after a system with moderate frost formation are adopted for defrosting, but a method of defrosting before a system with moderate frost formation and a method of defrosting after a system with severe frost formation may also be selected, and a method of defrosting without one system and waiting for another system may also be selected, but a method of defrosting by entering two systems together is adopted for defrosting.
In addition, when the system operates in the defrosting mode, the condensing fan 9 can stop operating instead of keeping low-speed operation, but because the low-speed operation of the condensing fan 9 can ensure that indoor materials cannot be stuffy and bad in a high-temperature and high-humidity environment, the scheme can reduce energy consumption and is only selected for the second time.
The defrosting exit condition for the single-system defrosting is one of the following conditions:
E. the defrosting time of the system is greater than Dtamax;
F. temperature of the outdoor coil of the system > OCT.
When the double-system defrosting is performed, the condition that the system entering the defrosting first exits the defrosting is the same as the condition that the system entering the defrosting second exits the defrosting, and the condition that the system entering the defrosting later exits the defrosting meets one of the following three conditions:
F. temperature of the outdoor coil of the system > OCT;
G. the defrosting time of the system is > Dtbmax, because the frosting amount of the system entering the defrosting later is less than the defrosting amount of the system entering the defrosting first, and in addition, the defrosting amount of the system entering the defrosting later may be slightly melted during the defrosting period of the system entering the defrosting first, so that the Dtbmax < Dtamax in general;
H. the total defrosting time of the dual-system heat pump is > Dtmax.
In order to prevent the excessive frosting amount of the system and the overlong defrosting time of the system, default defrosting time DT, minimum defrosting interval time Dimin and maximum defrosting interval time Dimax are set, when the defrosting time of the double heat pump system is greater than DT + x, the value of DI is changed into DI +10min, when the defrosting time of the double heat pump system is less than DT-y, the value of DI is changed into DI-10min, the maximum value of DI is Dimax, and the minimum value of DI is Dimin.
It should be noted that:
the method used in this embodiment can be converted into program steps that can be stored in a computer storage medium, and is implemented by being invoked and executed by a controller of the dual-system heat pump unit.
The methods provided herein are not inherently related to any particular computer, dual system heat pump unit, or other apparatus. Various general dual system heat pump units may also be used in conjunction with the teachings herein. The construction required to construct such a dual system heat pump unit will be apparent from the above description. Moreover, the present invention is not directed to any particular programming language. It is appreciated that a variety of programming languages may be used to implement the teachings of the present invention as described herein, and any descriptions of specific languages are provided above to disclose the best mode of the invention.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.
The various component embodiments of the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. It will be appreciated by those skilled in the art that a microprocessor or Digital Signal Processor (DSP) may be used in practice to implement some or all of the functions of some or all of the components of a dual system heat pump unit in accordance with embodiments of the present invention. The present invention may also be embodied as an apparatus or dual system heat pump unit program (e.g., computer program and computer program product) for performing a portion or all of the methods described herein. Such programs implementing the present invention may be stored on computer-readable media or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
For example, fig. 4 is a schematic diagram illustrating a control loop structure of a dual-system heat pump unit according to an embodiment of the present invention. The heat pump unit conventionally comprises a processor 41 and a memory 42 arranged to store computer executable instructions (program code). The memory 42 may be an electronic memory such as a flash memory, an EEPROM (electrically erasable programmable read only memory), an EPROM, a hard disk, or a ROM. The memory 42 has a storage space 43 storing program code 44 for performing any of the method steps in the embodiments. For example, the storage space 23 for the program code may comprise respective program codes 44 for implementing respective steps in the above method. The program code can be read from or written to one or more computer program products. These computer program products comprise a program code carrier such as a hard disk, a Compact Disc (CD), a memory card or a floppy disk. Such a computer program product is typically a computer storage medium such as described in fig. 5. The computer storage medium may have a storage section, a storage space, etc. arranged similarly to the memory 42 in the dual-system heat pump unit of fig. 4. The program code may be compressed, for example, in a suitable form. In general, the memory unit stores a program code 51 for executing the steps of the method according to the invention, i.e. a program code which can be read by a processor such as 51 and which, when run by the dual-system heat pump unit, causes the dual-system heat pump unit to carry out the individual steps of the method described above.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several heat pump units, several of these heat pump units can be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
Claims (10)
1. A defrosting method of a dual-system heat pump is characterized in that: when one group of heat pump systems of the double-system heat pump is detected to meet the first defrosting condition, whether the other group of heat pump systems of the double-system heat pump meets the second defrosting condition is detected, if the other group of heat pump systems meets the second defrosting condition, the double-system heat pump is controlled to enter a double-system defrosting mode, if the other group of heat pump systems does not meet the second defrosting condition, the double-system heat pump is controlled to enter a single-system defrosting mode, and the double-system heat pump exits after defrosting is completed, wherein if the first defrosting condition is.
2. The dual system heat pump defrost method of claim 1 wherein: the single-system defrosting mode is that the heat pump system meeting the first defrosting condition enters a defrosting mode, and the other heat pump system stops for waiting.
3. The dual system heat pump defrost method of claim 1 wherein: the double-system defrosting mode is that the heat pump system meeting the first defrosting condition firstly enters defrosting, and after the heat pump system finishes defrosting, the other group of heat pump system is started to enter defrosting.
4. The dual system heat pump defrost method of claim 1 wherein: the first defrost condition comprises a severe system frosting, which is characterized by a degree of frosting that has negatively affected system heating, and the second defrost condition comprises a moderate system frosting, which is characterized by a frosting but not negatively affected system heating.
5. The dual system heat pump defrost method of claim 4 wherein:
the first and second defrosting conditions each include a heating accumulated operation time of the heat pump system, DI, and a compressor continuous operation time of the heat pump system, DTCom, wherein DI and DTCom are set values empirically obtained,
if the defrosting is carried out on the system after the double-system heat pump is started, the heating accumulated running time refers to the time from the current time to the last defrosting of the system, and if the defrosting is not carried out on the system after the double-system heat pump is started, the heating accumulated running time refers to the time from the current time to the starting.
6. The dual system heat pump defrost method of claim 4 wherein: the severe frosting of the system is that the low-pressure saturation temperature T < DST corresponding to the low-pressure of the system is a set value determined according to hardware parameters of the dual-system heat pump, the moderate frosting of the system is that the low-pressure saturation temperature T corresponding to the low-pressure of the system is less than or equal to DST plus delta DST, and the delta DST is a set value determined according to the hardware parameters of the dual-system heat pump and the environment temperature.
7. The dual system heat pump defrost method of claim 1 wherein: and when the double-system heat pump unit enters a single-system defrosting mode or a double-system defrosting mode, controlling a condensing fan (9) of the double-system heat pump unit to keep running at a low speed.
8. The dual system heat pump defrost method of claim 1 wherein: and after the double-system heat pump unit finishes defrosting, controlling the evaporation fan (19) to run at a high speed for a set time.
9. Computer storage medium storing a computer program which, when executed by a processor, implements the method of any one of claims 1-8.
10. A dual system heat pump unit, the dual system heat pump unit comprising: comprises a first compressor (1), a first four-way valve (2), a first low-pressure sensor (3), a first gas-liquid separator (4), a first electronic expansion valve (6), a double-channel condenser (8), a condensing fan (9), a second electronic expansion valve (12), a second gas-liquid separator (14), a second low-pressure sensor (15), a second four-way valve (16), a second compressor (17), an evaporating fan (19), a double-channel evaporator (20) and an outdoor environment temperature sensor for detecting outdoor temperature,
an exhaust port of a first compressor (1) is connected with a first interface of a first four-way valve (2), a second interface of the first four-way valve (2) passes through a first flow path of a double-flow-path condenser (8) and then sequentially passes through a first electronic expansion valve (6) and a first flow path of a double-flow-path evaporator (20) and then is connected with a third interface of the first four-way valve (2), a fourth interface of the first four-way valve (2) passes through a first gas-liquid separator (4) and then is connected with an air suction port of the first compressor (1), a first low-pressure sensor (3) is positioned on a low-pressure pipe of the first gas-liquid separator (4) to detect the pressure of the low-,
the exhaust port of the second compressor (17) is connected with a first interface of a second four-way valve (16), a second interface of the second four-way valve (16) passes through a second flow path of the double-flow-path condenser (8) and then sequentially passes through a second electronic expansion valve (12) and a second flow path of the double-flow-path evaporator (20) and then is connected with a third interface of the second four-way valve (16), a fourth interface of the second four-way valve (16) passes through a second gas-liquid separator (14) and then is connected with the suction port of the second compressor (17), a second low-pressure sensor (15) is positioned on a low-pressure pipe of the second gas-liquid separator (14) to detect the pressure of the low-pressure pipe,
the evaporation fan (19) is used for supplying air to the double-flow-path evaporator (20), the condensation fan (9) is used for supplying air to the double-flow-path condenser (8), and the device is characterized by further comprising:
a controller; and the number of the first and second groups,
a memory arranged to store computer executable instructions that, when executed, cause the controller to implement the method of any one of claims 1-8.
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