CN116086015A - Control method and device of heat pump unit, controller and heat pump host - Google Patents

Control method and device of heat pump unit, controller and heat pump host Download PDF

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Publication number
CN116086015A
CN116086015A CN202211489547.3A CN202211489547A CN116086015A CN 116086015 A CN116086015 A CN 116086015A CN 202211489547 A CN202211489547 A CN 202211489547A CN 116086015 A CN116086015 A CN 116086015A
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China
Prior art keywords
real
heat pump
pump unit
time
capacity
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Pending
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CN202211489547.3A
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Chinese (zh)
Inventor
张常雄
文邦春
陈可兄
何健乐
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Hot Cube Technology Foshan Co ltd
Zhongshan Amitime Electric Co ltd
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Hot Cube Technology Foshan Co ltd
Zhongshan Amitime Electric Co ltd
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Priority to CN202211489547.3A priority Critical patent/CN116086015A/en
Publication of CN116086015A publication Critical patent/CN116086015A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H4/00—Fluid heaters characterised by the use of heat pumps
    • F24H4/02—Water heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/212—Temperature of the water
    • F24H15/219—Temperature of the water after heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/238—Flow rate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/305—Control of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/375—Control of heat pumps
    • F24H15/38—Control of compressors of heat pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/375—Control of heat pumps
    • F24H15/385—Control of expansion valves of heat pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/40—Control of fluid heaters characterised by the type of controllers
    • F24H15/414—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based
    • F24H15/421—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/40—Control of fluid heaters characterised by the type of controllers
    • F24H15/486—Control of fluid heaters characterised by the type of controllers using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • 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

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Fluid Mechanics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention relates to a control method and device of a heat pump unit, a controller and a heat pump host. The control method of the heat pump unit comprises the following steps: controlling the compressor of the heat pump unit to be started at a set operating frequency Fm, and continuing to operate for a time t; collecting real-time water flow L and real-time water inlet and outlet temperature difference delta T of a heat pump unit, and determining real-time output capacity Q of the heat pump unit according to the real-time water flow L and the real-time water inlet and outlet temperature difference delta T; dividing the real-time output capacity Q and the load demand capacity Qm of the heat pump unit, and multiplying the result after the dividing by the set operating frequency Fm; obtaining a target operating frequency F according to the multiplied result; and controlling the compressor to operate at the target operating frequency F. The invention can adjust the operation frequency of the compressor by real-time operation parameters, reduce the adjustment time and ensure that the real-time output capacity can rapidly meet the load demand capacity.

Description

Control method and device of heat pump unit, controller and heat pump host
Technical Field
The present invention relates to the field of heat pump devices, and in particular, to a method and an apparatus for controlling a heat pump unit, a controller, and a heat pump host.
Background
With the progress of variable frequency compressors and variable frequency driving technologies in the field of heating ventilation and air conditioning equipment, heat pump products are rapidly developing towards the variable frequency technology. The operation capability of the variable frequency heat pump can be dynamically adjusted to adapt to the change of working conditions, so that the variable frequency heat pump is technically superior to a constant speed heat pump product, and frequent starting and stopping are not needed.
The current capacity output mode of the variable frequency heat pump is a step-type adjustment mode. As shown in fig. 1, when the capacity output cannot reach the load demand, the heat pump capacity output is stepped up by frequency conversion until the load and the capacity output reach equilibrium. Otherwise, when the capacity output of the variable-frequency heat pump is larger than the load requirement, the capacity output is stepped down until the load and the capacity output reach balance. The capacity output adjusting mode is long in adjusting period, so that the energy consumption output of the product is increased, and the use experience of a user is reduced.
Disclosure of Invention
Based on the above, the invention aims to provide a control method, a device, a controller and a heat pump host of a heat pump unit, which can adjust the operation frequency of a compressor according to real-time operation parameters, reduce the adjustment time and enable the real-time output capacity to rapidly meet the load demand capacity.
According to a first aspect of some embodiments of the present application, there is provided a control method of a heat pump unit, including the steps of:
controlling the compressor of the heat pump unit to be started at a set operating frequency Fm, and continuing to operate for a time t;
collecting real-time water flow L and real-time water inlet and outlet temperature difference delta T of the heat pump unit, and determining real-time output capacity Q of the heat pump unit according to the real-time water flow L and the real-time water inlet and outlet temperature difference delta T;
dividing the real-time output capacity Q and the load demand capacity Qm of the heat pump unit, and multiplying the result after the dividing by the set operating frequency Fm;
obtaining a target operating frequency F according to the multiplied result;
and controlling the compressor to operate at the target operating frequency F.
Further, after determining the real-time output capacity Q of the heat pump unit, the method further includes the following steps:
judging whether the difference value between the real-time output capacity Q and the load demand capacity Qm meets a set threshold value or not;
and if so, controlling the compressor to operate at the set operating frequency Fm.
Further, the determining whether the difference between the real-time output capability Q and the load demand capability Qm satisfies a set threshold includes:
it is determined whether the real-time output capacity Q is not less than 90% of the load demand capacity Qm or whether the real-time output capacity Q is not more than 110% of the load demand capacity Qm.
Further, the obtaining the target operating frequency F according to the result after the multiplication processing includes:
multiplying the multiplied result by a preset capacity influence coefficient to obtain the target operating frequency F; the larger the ratio between the real-time water flow L and the load demand rated flow Lm is, the larger the capacity influence coefficient is.
Further, the capacity influence coefficient f (x) is calculated according to the following formula:
f(x)＝-ax 3 +bx 2 -cx+d
wherein x is the ratio of the real-time water flow L to the rated water flow Lm required by the load, a is 0.3-0.8, b is 1.4-1.9, c is 1.4-1.9, and d is 1.2-1.5.
According to a second aspect of some embodiments of the present application, there is provided a control device of a heat pump unit, the device comprising:
the control unit starting module is used for controlling the compressor of the heat pump unit to start at a set running frequency Fm and for continuously running for a time t;
the real-time parameter acquisition module is used for acquiring the real-time water flow L of the heat pump unit and the real-time water inlet and outlet temperature difference delta T, and determining the real-time output capacity Q of the heat pump unit according to the real-time water flow L and the real-time water inlet and outlet temperature difference delta T;
the operation frequency calculation module is used for dividing the real-time output capacity Q and the load demand capacity Qm of the heat pump unit, and multiplying the result after the dividing and processing by the set operation frequency Fm;
the operation frequency calculation module is further used for obtaining a target operation frequency F according to the multiplied result;
and the operating frequency correction module is used for controlling the compressor to operate at the target operating frequency F.
According to a third aspect of some embodiments of the present application, there is provided a controller comprising:
at least one memory and at least one processor;
the memory is used for storing one or more programs;
when the one or more programs are executed by the at least one processor, the at least one processor is caused to implement the steps of a method for controlling a heat pump unit according to any one of the first aspect.
According to a third aspect of some embodiments of the present application, there is provided a heat pump host comprising a controller as described in the third aspect above.
According to the control method, the device, the controller and the heat pump host of the heat pump unit, the real-time output capacity of the heat pump unit is determined by collecting the real-time water flow and the real-time water inlet and outlet temperature difference, when the real-time output capacity does not meet the load demand capacity of the heat pump unit, the set operating frequency is corrected by the ratio of the real-time output capacity to the load demand capacity, and the compressor is controlled to operate at the corrected target operating frequency, so that the operating frequency of the compressor can be regulated by real-time operating parameters, and the regulating time is shortened; and when the load demand capacity of the heat pump unit changes, the real-time output capacity can synchronously change, so that the rapid balance of the real-time output capacity and the load demand capacity is met. The capacity influence coefficient of the heat pump unit is multiplied by the ratio of the real-time output capacity to the load demand capacity, so that a new target operating frequency is obtained, wherein the capacity influence coefficient can be calculated according to a fitting function of the influence of the ratio of the real-time water flow to the rated water flow on the heat pump energy efficiency, and the influence regulation of adding the real-time water flow in the compressor operating frequency regulation is realized.
For a better understanding and implementation, the present invention is described in detail below with reference to the drawings.
Drawings
FIG. 1 is a schematic diagram of a prior art variable frequency heat pump with stepped adjustment of capacity output;
fig. 2 is a schematic step diagram of a control method of a heat pump unit according to the present invention;
FIG. 3 is a schematic flow chart of a control method of a heat pump unit according to the present invention;
fig. 4 is a schematic diagram of a module structure of a control device of a heat pump unit according to the present invention;
fig. 5 is a schematic diagram of a refrigerant pipeline inside a heat pump host according to the present invention.
Reference numerals:
1. a compressor; 2. a plate heat exchanger; 3. a fin heat exchanger; 4. a four-way reversing valve; 5. an electronic expansion valve; 6. a water outlet temperature sensor; 7. a water inlet temperature sensor; 8. a water flowmeter.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the following detailed description of the embodiments of the present application will be given with reference to the accompanying drawings.
It should be understood that the described embodiments are merely some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the embodiments of the present application, are within the scope of the embodiments of the present application.
The terminology used in the embodiments of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the application. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as detailed in the accompanying claims. In the description of this application, it should be understood that the terms "first," "second," "third," and the like are used merely to distinguish between similar objects and are not necessarily used to describe a particular order or sequence, nor should they be construed to indicate or imply relative importance. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
Furthermore, in the description of the present application, unless otherwise indicated, "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.
Aiming at the technical problems in the background technology related to the background technology, the embodiment of the application provides a control method of a heat pump unit, which solves the problems of long regulation period and low efficiency of the existing heat pump system unit step-type regulation mode by regulating the operation frequency of a compressor in real time. As shown in fig. 2, in a specific embodiment, the control method of the heat pump unit provided by the present invention is executed by a control unit of a heat pump host, and includes the following steps:
s201: and controlling the compressor of the heat pump unit to start at a set operating frequency Fm, and continuing to operate for a time t.
When the heat pump unit receives a starting signal to start, the compressor is controlled to start at a set running frequency Fm, the running time of the compressor is started to be timed based on a timer, because the initial running of the compressor is unstable, the collected running parameters may have larger errors, and when the running time of the compressor after the starting running is greater than or equal to the running time t, the compressor can be regarded as in a stable running state, and the collected running parameters also tend to be stable. In one example, the run time t may be 1 minute or more.
S202: and collecting the real-time water flow L and the real-time water inlet and outlet temperature difference delta T of the heat pump unit, and determining the real-time output capacity Q of the heat pump unit according to the real-time water flow L and the real-time water inlet and outlet temperature difference delta T.
The real-time water flow L is detected by a water flow meter arranged on an outlet pipeline of the plate heat exchanger; the real-time water inlet and outlet temperature difference delta T is the difference between the real-time water inlet temperature and the real-time water outlet temperature, the water inlet temperature is obtained through a water inlet temperature sensor arranged on a water inlet pipeline of the plate heat exchanger, and the water outlet temperature is obtained through a water outlet temperature sensor arranged on a water outlet pipeline of the plate heat exchanger.
When the heat pump unit is actually used, the real-time output capacity Q can change along with the change of the temperature of the operating environment where the heat pump unit is located, in the embodiment of the application, the real-time water flow L and the real-time water inlet and outlet temperature difference delta T are used as main measurement parameters of the real-time output capacity Q, and in other embodiments, other heat pump unit operating parameters which change due to the change of the ring temperature can be fitted to be used as measurement parameters of the real-time output capacity Q.
S203: dividing the real-time output capacity Q and the load demand capacity Qm of the heat pump unit, and multiplying the result after the dividing by the set operating frequency Fm;
s204: obtaining a target operating frequency F according to the multiplied result;
s205: and controlling the compressor to operate at the target operating frequency F.
The load demand capacity Qm of the heat pump unit is generally determined according to the model of the heat pump unit, and in order to form a reference with the real-time output capacity Q, the rated water flow Lm and the rated water inlet and outlet temperature difference Tm of the load demand of the heat pump unit can be determined according to the model of the heat pump unit, and the rated operation capacity Qm of the variable-frequency heat pump unit can be determined according to the rated water flow Lm and the rated water inlet and outlet temperature difference Tm.
According to the method, the set operating frequency Fm is corrected by the ratio of the real-time output capacity Q to the load demand capacity Qm, and when the real-time output capacity Q does not meet the demand of the load demand capacity Qm, the set operating frequency Fm is corrected according to the correction scheme, so that the real-time output capacity Q and the load demand capacity Qm of the heat pump unit are balanced rapidly.
In a specific example, after determining the real-time output capacity Q of the heat pump unit, the method further includes the following steps:
judging whether the difference value between the real-time output capacity Q and the load demand capacity Qm meets a set threshold value or not;
and if so, controlling the compressor to operate at the set operating frequency Fm.
When the difference between the real-time output capacity Q and the load demand capacity Qm meets a set threshold range, the current operating frequency of the compressor can be considered to meet the load demand capacity requirement of the heat pump unit, so that the compressor is controlled to operate at the set operating frequency Fm, otherwise, the set operating frequency needs to be corrected according to the correction step, and the corrected target operating frequency F is operated.
In a specific example, the determining whether the difference between the real-time output capability Q and the load demand capability Qm satisfies a set threshold includes:
it is determined whether the real-time output capacity Q is not less than 90% of the load demand capacity Qm or whether the real-time output capacity Q is not more than 110% of the load demand capacity Qm.
Wherein, whether the real-time output capacity Q is not less than 90% of the load demand capacity Qm or whether the real-time output capacity Q is not more than 110% of the load demand capacity Qm can be judged by the real-time water flow L and the real-time water inlet-outlet temperature difference Δt, and the rated water flow Lm and the rated water inlet-outlet temperature difference Tm.
Specifically, the determination can be made according to the formula l×Δt= (0.9 to 1.1) lm×tm.
In a specific example, the embodiment of the present application further adds, to the embodiments of steps S3 to S5, an influence coefficient of the real-time water flow on the real-time output capability, specifically, the obtaining the target operating frequency F according to the result after the multiplication processing includes:
multiplying the multiplied result by a preset capacity influence coefficient F (x) to obtain the target operating frequency F; the larger the ratio between the real-time water flow L and the load demand rated flow Lm is, the larger the capacity influence coefficient is.
Specifically, the calculation may be performed according to the formula f=f (x) (L/Lm) ×Δt/Tm) ×fm.
In a specific example, the capacity influence coefficient f (x) is calculated according to the following formula:
f(x)＝-ax 3 +bx 2 -cx+d
wherein x is the ratio of the real-time water flow L to the rated water flow Lm, a is 0.3-0.8, b is 1.4-1.9, c is 1.4-1.9, and d is 1.2-1.5.
Specifically, the rated energy efficiency value of the heat pump unit is determined to be 1 when the ratio of the real-time water flow L to the rated water flow Lm is 1, so that when the ratio of the real-time water flow L to the rated water flow Lm accords with the area range of 0.8-1, the rated energy efficiency value of the heat pump unit is obtained to be 0.95-1 originally; when the ratio of the real-time water flow L to the rated water flow Lm is in the range of 1-1.3, the rated energy efficiency value of the heat pump unit is 1-1.3. And the capacity influence coefficient f (x) formula is obtained according to the ratio of the real-time water flow L to the rated water flow Lm and the corresponding heat pump unit influence value fitting, and the influence value of the real-time water flow ratio L/Lm on the heat pump unit of the heat pump unit accords with the formula within a certain range.
In a specific application scenario, as shown in fig. 3, the application determines the model of the heat pump unit according to the requirement of the actual use environment, obtains rated water flow Lm and rated water inlet and outlet temperature difference Tm of the heat pump unit according to the selected model, and determines the load demand capacity Qm of the heat pump unit according to the rated water flow Lm and the rated water inlet and outlet temperature difference Tm; the heat pump unit is controlled to be started at a set operating frequency Fm, and the operating time t is continued; collecting real-time water flow L and real-time water inlet and outlet temperature difference delta T of the heat pump unit, and determining real-time output capacity Q of the heat pump unit according to the real-time water flow L and the real-time water inlet and outlet temperature difference delta T; judging whether the real-time output capacity Q meets the requirement of the load demand capacity Qm according to the real-time output capacity Q and the load demand capacity Qm, controlling the heat pump unit to operate at a set operating frequency Fm when the real-time output capacity Q meets the requirement of the load demand capacity Qm, and controlling the heat pump unit to operate at a target operating frequency F when the real-time output capacity Q does not meet the requirement of the load demand capacity Qm, wherein the target operating frequency F is the ratio of the real-time output capacity Q to the load demand capacity Qm, multiplying F (x), and multiplying the obtained result by the set operating frequency Fm.
Corresponding to the above-mentioned operation control method of a heat pump unit, the present application further provides a control device of a heat pump unit, as shown in fig. 4, fig. 4 is a schematic block diagram of a control device of a heat pump unit, where the device 400 includes:
a control unit starting module 401, configured to control a compressor of the heat pump unit to start at a set operating frequency Fm, and to continue for an operating time t;
the real-time parameter acquisition module 402 is configured to acquire a real-time water flow L and a real-time water inlet and outlet temperature difference Δt of the heat pump unit, and determine a real-time output capacity Q of the heat pump unit according to the real-time water flow L and the real-time water inlet and outlet temperature difference Δt;
an operating frequency calculation module 403, configured to divide the real-time output capacity Q by the load demand capacity Qm of the heat pump unit, and multiply the result after the division by the set operating frequency Fm;
the operation frequency calculation module 403 is further configured to obtain a target operation frequency F according to the result after the multiplication;
an operating frequency correction module 404 for controlling the compressor to operate at the target operating frequency F.
In an alternative embodiment, the real-time parameter acquisition module 402 of the apparatus 400 further comprises:
a judging unit configured to judge whether a difference between the real-time output capability Q and the load demand capability Qm satisfies a set threshold;
and if so, controlling the compressor to operate at the set operating frequency Fm.
In an alternative embodiment, the real-time parameter acquisition module 402 of the apparatus 400 further comprises:
and a second judging unit for judging whether the real-time output capacity Q is not less than 90% of the load demand capacity Qm or whether the real-time output capacity Q is not more than 110% of the load demand capacity Qm.
In an alternative embodiment, the operation frequency calculation module 403 of the apparatus 400 further includes:
an influence coefficient calculation unit, configured to multiply the result after the multiplication processing by a preset capability influence coefficient to obtain the target operating frequency F; the larger the ratio between the real-time water flow L and the load demand rated flow Lm is, the larger the capacity influence coefficient is.
In an alternative embodiment, the operation frequency calculation module 403 of the apparatus 400 further includes:
the specific calculation unit is used for calculating the capacity influence coefficient f (x) according to the following formula:
f(x)＝-ax 3 +bx 2 -cx+d
wherein x is the ratio of the real-time water flow L to the rated water flow Lm required by the load, a is 0.3-0.8, b is 1.4-1.9, c is 1.4-1.9, and d is 1.2-1.5.
For the device embodiments, reference is made to the description of the method embodiments for the relevant points, since they essentially correspond to the method embodiments. The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements. It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
Corresponding to the above-mentioned control method of the heat pump unit, the embodiment of the application further provides a controller of the heat pump unit, including:
at least one memory and at least one processor;
the memory is used for storing one or more programs;
the one or more programs, when executed by the at least one processor, cause the at least one processor to implement the steps of a method of controlling a heat pump unit as described in any of the embodiments above.
Corresponding to the control method of the heat pump unit, the embodiment of the application also provides a heat pump host, which comprises the controller in the embodiment.
Specifically, as shown in fig. 5, the heat pump host further comprises a compressor 1, a plate heat exchanger 2 and a fin heat exchanger 3 which are sequentially connected through refrigerant pipelines, and a four-way reversing valve 4 is arranged between the compressor 1 and the plate heat exchanger 2 and between the compressor 1 and the fin heat exchanger 3, so that the circulation direction of a refrigerant in the pipelines can be changed by changing the communication direction of the four-way reversing valve 4, and the heat pump unit can be switched among refrigeration, dehumidification and heating modes. Optionally, an electronic expansion valve 5 is arranged between the plate heat exchanger 2 and the fin heat exchanger 3.
The heat pump host also comprises a water outlet temperature sensor 6, a water inlet temperature sensor 7 and a water flow meter 8, wherein the water outlet temperature sensor 6 and the water flow meter 8 are arranged on a water outlet pipeline of the plate heat exchanger and are used for respectively detecting real-time water outlet temperature and real-time water flow; the water inlet temperature sensor 7 is arranged on a water inlet pipeline of the plate heat exchanger and is used for detecting the real-time water inlet temperature.
In one example, a controller of a heat pump host receives a starting signal, controls a compressor to start working, drives a refrigerant to run in a closed loop system formed by a plate type heat exchanger, an electronic expansion valve and a fin type heat exchanger in a condensing pipeline, realizes refrigeration or heating, and detects real-time water outlet temperature and real-time water inlet temperature through a water outlet temperature sensor and a water inlet temperature sensor and detects real-time water flow through a water flow meter in the refrigerating or heating process of a heat pump unit; the controller executes the steps of the control method of the heat pump unit according to any of the above embodiments according to the above data.
According to the control method, the device, the controller and the heat pump host of the heat pump unit, the real-time output capacity of the heat pump unit is determined by collecting the real-time water flow and the real-time water inlet and outlet temperature difference, when the real-time output capacity does not meet the load demand capacity of the heat pump unit, the set operating frequency is corrected by the ratio of the real-time output capacity to the load demand capacity, and the compressor is controlled to operate at the corrected target operating frequency, so that the operating frequency of the compressor can be regulated by real-time operating parameters, and the regulating time is shortened; and when the load demand capacity of the heat pump unit changes, the real-time output capacity can synchronously change, so that the rapid balance of the real-time output capacity and the load demand capacity is met. The capacity influence coefficient of the heat pump unit is multiplied by the ratio of the real-time output capacity to the load demand capacity, so that a new target operating frequency is obtained, wherein the capacity influence coefficient can be calculated according to a fitting function of the influence of the ratio of the real-time water flow to the rated water flow on the heat pump energy efficiency, and the influence regulation of adding the real-time water flow in the compressor operating frequency regulation is realized.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.

Claims (8)

1. The control method of the heat pump unit is characterized by comprising the following steps:
controlling the compressor of the heat pump unit to be started at a set operating frequency Fm, and continuing to operate for a time t;
collecting real-time water flow L and real-time water inlet and outlet temperature difference delta T of the heat pump unit, and determining real-time output capacity Q of the heat pump unit according to the real-time water flow L and the real-time water inlet and outlet temperature difference delta T;
dividing the real-time output capacity Q and the load demand capacity Qm of the heat pump unit, and multiplying the result after the dividing by the set operating frequency Fm;
obtaining a target operating frequency F according to the multiplied result;
and controlling the compressor to operate at the target operating frequency F.
2. The control method of a heat pump unit according to claim 1, further comprising the steps of, after determining the real-time output capacity Q of the heat pump unit:
judging whether the difference value between the real-time output capacity Q and the load demand capacity Qm meets a set threshold value or not;
and if so, controlling the compressor to operate at the set operating frequency Fm.
3. The method according to claim 2, wherein the determining whether the difference between the real-time output capacity Q and the load demand capacity Qm satisfies a set threshold value comprises:
it is determined whether the real-time output capacity Q is not less than 90% of the load demand capacity Qm or whether the real-time output capacity Q is not more than 110% of the load demand capacity Qm.
4. The control method of a heat pump unit according to claim 1, wherein the obtaining the target operating frequency F according to the result of the multiplication processing includes:
multiplying the multiplied result by a preset capacity influence coefficient to obtain the target operating frequency F; the larger the ratio between the real-time water flow L and the rated load water flow Lm is, the larger the capacity influence coefficient is.
5. The control method of a heat pump unit according to claim 4, wherein:
the capacity influence coefficient f (x) is calculated according to the following formula:
f(x)＝-ax 3 +bx 2 -cx+d
wherein x is the ratio of the real-time water flow L to the rated water flow Lm required by the load, a is 0.3-0.8, b is 1.4-1.9, c is 1.4-1.9, and d is 1.2-1.5.
6. A control device for a heat pump unit, comprising:
the control unit starting module is used for controlling the compressor of the heat pump unit to start at a set running frequency Fm and for continuously running for a time t;
the real-time parameter acquisition module is used for acquiring the real-time water flow L of the heat pump unit and the real-time water inlet and outlet temperature difference delta T, and determining the real-time output capacity Q of the heat pump unit according to the real-time water flow L and the real-time water inlet and outlet temperature difference delta T;
the operation frequency calculation module is used for dividing the real-time output capacity Q and the load demand capacity Qm of the heat pump unit, and multiplying the result after the dividing and processing by the set operation frequency Fm;
the operation frequency calculation module is further used for obtaining a target operation frequency F according to the multiplied result;
and the operating frequency correction module is used for controlling the compressor to operate at the target operating frequency F.
7. A controller, comprising:
at least one memory and at least one processor;
the memory is used for storing one or more programs;
when the one or more programs are executed by the at least one processor, the at least one processor is caused to implement the steps of a method of controlling a heat pump unit according to any one of claims 1 to 5.
8. A heat pump host, characterized by:
comprising a controller as claimed in claim 7.
CN202211489547.3A 2022-11-25 2022-11-25 Control method and device of heat pump unit, controller and heat pump host Pending CN116086015A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211489547.3A CN116086015A (en) 2022-11-25 2022-11-25 Control method and device of heat pump unit, controller and heat pump host

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211489547.3A CN116086015A (en) 2022-11-25 2022-11-25 Control method and device of heat pump unit, controller and heat pump host

Publications (1)

Publication Number Publication Date
CN116086015A true CN116086015A (en) 2023-05-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211489547.3A Pending CN116086015A (en) 2022-11-25 2022-11-25 Control method and device of heat pump unit, controller and heat pump host

Country Status (1)

Country Link
CN (1) CN116086015A (en)

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