CN114165942A - Heat pump set - Google Patents
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- CN114165942A CN114165942A CN202111386122.5A CN202111386122A CN114165942A CN 114165942 A CN114165942 A CN 114165942A CN 202111386122 A CN202111386122 A CN 202111386122A CN 114165942 A CN114165942 A CN 114165942A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 112
- 238000000034 method Methods 0.000 claims description 4
- 230000002354 daily effect Effects 0.000 description 85
- 239000003507 refrigerant Substances 0.000 description 15
- 238000010438 heat treatment Methods 0.000 description 11
- 230000003203 everyday effect Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000005057 refrigeration Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 230000005494 condensation Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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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
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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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
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention discloses a heat pump unit, which enters an energy-saving mode when the daily actual output load of n days before the heat pump unit is in a stable state, and adjusts the highest operating frequency and the set water temperature of a compressor according to the daily continuous operating time of n days before the heat pump unit in the energy-saving mode so as to achieve the purposes of saving energy and reducing consumption and ensuring the comfort of users.
Description
Technical Field
The invention relates to the technical field of electric appliances, in particular to a heat pump unit.
Background
At present, the development of household water machines (air source heat pump units) is rapid, and the market growth rate reaches 30%; with the wide application of the household water machine, the energy-saving effect of the household water machine is more and more concerned by the industry.
At present, many products in the market put out the energy-saving mode of the unit, and a user can set the energy-saving mode through a wire controller. Under the 'energy-saving mode', the water outlet temperature of the unit is automatically adjusted according to the change of the outdoor environment temperature, namely the unit has the function of automatically adjusting the outlet water temperature (namely OTC). Under the function, the unit outlet water temperature can change according to the environment temperature. For example, at the lowest ambient temperature, the corresponding outlet water temperature set point is C5; at the highest ambient temperature, the corresponding outlet water temperature set point is C6.
However, when the outlet water temperature is adjusted according to the ambient temperature, the application scene of the unit is not considered, for example, when different buildings, floor heating laying modes of model selection and fan coil model selection are different, the outlet water temperature of a single control unit cannot meet the requirement of user comfort, the energy consumption of the unit is not low, and the energy-saving effect and the user comfort are not comprehensively considered.
Disclosure of Invention
The invention provides a heat pump unit, which can improve the comfort of users and reduce the energy consumption by adjusting the highest operating frequency and the set water temperature of a compressor according to the Time of the daily continuous operating Time of n days before the heat pump unit.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a heat pump unit, comprising:
a controller configured to:
when the daily actual output load of the heat pump unit is in a stable state n days before the heat pump unit, the heat pump unit enters an energy-saving mode;
under an energy-saving mode, acquiring the daily continuous operation Time of the heat pump unit for n days; and adjusting the maximum operating frequency of the compressor and the set water temperature according to the Time.
Further, the adjusting of the maximum operating frequency of the compressor and the set water temperature according to the Time specifically includes:
if the Time is less than or equal to the first set duration, reducing the highest running frequency of the compressor and the set water temperature;
if the first set Time is less than the Time and less than or equal to the second set Time, reducing the highest running frequency of the compressor and maintaining the set water temperature;
if the second set Time is less than the Time and less than or equal to the third set Time, maintaining the highest running frequency of the compressor and the set water temperature;
if the Time is larger than the third set Time, the highest running frequency of the compressor is recovered to the frequency before the compressor enters the energy-saving mode, and the set water temperature is recovered to the water temperature before the compressor enters the energy-saving mode.
Still further, if the Time is less than or equal to the first set duration, the maximum operating frequency and the set water temperature of the compressor are reduced, which specifically includes:
judging whether the highest operation frequency of the compressor is reduced to an optimal operation frequency section;
if not, reducing the highest running frequency of the compressor;
if yes, the set water temperature is lowered.
Furthermore, if the first set Time is less than the Time and less than or equal to the second set Time, the maximum operating frequency of the compressor is reduced, and the set water temperature is maintained, which specifically comprises:
keeping the set water temperature unchanged;
judging whether the highest operation frequency of the compressor is reduced to an optimal operation frequency section;
if not, reducing the highest running frequency of the compressor;
if so, the maximum operating frequency of the compressor is maintained.
Still further, if Time is greater than a third set duration, the maximum operating frequency of the compressor is restored to the frequency before entering the energy saving mode, and the set water temperature is restored to the water temperature before entering the energy saving mode, which specifically includes:
judging whether the highest running frequency of the compressor is recovered to the frequency before entering the energy-saving mode;
if not, the highest running frequency of the compressor is recovered to the frequency before entering the energy-saving mode;
if so, the set water temperature is restored to the water temperature before entering the energy-saving mode.
Further, when the variation range of the daily continuous operation time of the heat pump unit for the previous n days compared with the previous day is within a preset range, and the variation range of the daily set water temperature of the previous n days compared with the previous day is within the preset range, the daily actual output load of the heat pump unit for the previous n days is judged to be in a stable state, and the heat pump unit enters an energy-saving mode.
Still further, when the variation range of the daily continuous operation time of the heat pump unit n days before the heat pump unit is not within the preset range compared with the previous day, or the variation range of the daily set water temperature of the previous n days before the previous day is not within the preset range, or the variation range of the daily power consumption of the compressor n days before the previous day is not within the preset range, it is determined that the daily actual output load of the heat pump unit n days before the heat pump unit is in an unstable state, and the heat pump unit exits the energy-saving mode.
Further, the preset range is [ -20%, +20% ].
Still further, the first set time period is 6 hours, the second set time period is 12 hours, and the third set time period is 18 hours.
Further, n = 7.
Compared with the prior art, the technical scheme of the invention has the following technical effects: according to the heat pump unit, when the daily actual output load of the heat pump unit for the previous n days is in a stable state, the heat pump unit enters an energy-saving mode, and under the energy-saving mode, the highest operation frequency and the set water temperature of the compressor are adjusted according to the daily continuous operation time of the heat pump unit for the previous n days, so that the purposes of saving energy and reducing consumption and ensuring user comfort are achieved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of an embodiment of energy saving control of a heat pump unit of the present invention;
fig. 2 is a flowchart of another embodiment of energy-saving control of the heat pump unit of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center," "upper," "lower," "front," "back," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application.
In the description of the present application, it is to be understood that the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The heat pump unit performs a cooling and heating cycle of the heat pump unit by using a compressor, a condenser, an expansion valve, and an evaporator. The cooling and heating cycle includes a series of processes involving compression, condensation, expansion, and evaporation to cool or heat an indoor space.
The low-temperature and low-pressure refrigerant enters the compressor, the compressor compresses the refrigerant gas in a high-temperature and high-pressure state, and the compressed refrigerant gas is discharged. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The expansion valve expands the high-temperature and high-pressure liquid-phase refrigerant condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a refrigerating effect by heat exchange with a material to be cooled using latent heat of evaporation of a refrigerant. In the whole circulation, the heat pump unit can adjust the temperature of the indoor space.
The outdoor unit of the heat pump unit refers to a portion of the refrigeration cycle including a compressor, an outdoor heat exchanger, and an outdoor fan, the indoor unit of the heat pump unit includes portions of an indoor heat exchanger and an indoor fan, and a throttle device (such as a capillary tube or an electronic expansion valve) may be provided in the indoor unit or the outdoor unit.
The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. The heat pump unit performs a heating mode when the indoor heat exchanger serves as a condenser, and performs a cooling mode when the indoor heat exchanger serves as an evaporator.
The indoor heat exchanger and the outdoor heat exchanger are switched to be used as a condenser or an evaporator, a four-way valve is generally adopted, and specific reference is made to the setting of a conventional heat pump unit, which is not repeated herein.
The refrigeration working principle of the heat pump unit is as follows: the compressor works to enable the interior of the indoor heat exchanger (in the indoor unit, the evaporator at the moment) to be in an ultralow pressure state, liquid refrigerant in the indoor heat exchanger is rapidly evaporated to absorb heat, air blown out by the indoor fan is cooled by the coil pipe of the indoor heat exchanger to become cold air which is blown into a room, the evaporated and vaporized refrigerant is compressed by the compressor, is condensed into liquid in a high-pressure environment in the outdoor heat exchanger (in the outdoor unit, the condenser at the moment) to release heat, and the heat is dissipated into the atmosphere through the outdoor fan, so that the refrigeration effect is achieved by circulation.
The heating working principle of the heat pump unit is as follows: the gaseous refrigerant is pressurized by the compressor to become high-temperature and high-pressure gas, and the high-temperature and high-pressure gas enters the indoor heat exchanger (the condenser at the moment), is condensed, liquefied and released heat to become liquid, and simultaneously heats indoor air, so that the aim of increasing the indoor temperature is fulfilled. The liquid refrigerant is decompressed by the throttling device, enters the outdoor heat exchanger (an evaporator at the moment), is evaporated, gasified and absorbs heat to form gas, absorbs the heat of outdoor air (the outdoor air becomes cooler) to form gaseous refrigerant, and enters the compressor again to start the next cycle.
The heat pump unit of this embodiment is air source heat pump unit, can export cold water, hot water when refrigeration, heating, provides the water terminal and uses, and the water terminal can be equipment such as ground heating, installs in the building.
For an air source heat pump heating unit, the energy efficiency of the unit is reduced by high-frequency operation and high-temperature operation; after the configuration of the unit is determined, according to the characteristics of the compressor and the type selection characteristics of the heat exchanger, the operation energy efficiency of the unit presents a parabolic trend along with the gradual increase of the frequency, and an optimal operation frequency section exists, for example, the optimal operation frequency section of the integral heating machine is near 60 Hz. For example, the optimal operating frequency band is [55Hz, 65Hz ]; when the compressor runs in the optimal operation frequency section, the energy efficiency of the heat pump unit is optimal. In the normal mode of the heat pump unit, the highest operation frequency of the compressor is higher than the optimal operation frequency section.
The heat pump unit of the present embodiment includes a controller configured to: when the daily actual output load of the heat pump unit is in a stable state n days before the heat pump unit, the heat pump unit enters an energy-saving mode; under an energy-saving mode, acquiring the daily continuous operation Time of the heat pump unit for n days; and adjusting the maximum operating frequency of the compressor and the set water temperature according to the Time.
Specifically, the controller executes the following energy saving control steps, as shown in fig. 1.
Step S1: and judging whether the daily actual output load of the heat pump unit n days before is in a stable state.
And when the daily actual output load of the heat pump unit is in a stable state for n days, the heat pump unit enters an energy-saving mode or keeps the energy-saving mode, and step S2 is executed.
And when the daily actual output load of the heat pump unit for n days is in an unstable state, the heat pump unit exits the energy-saving mode and enters a normal mode.
Step S2: under an energy-saving mode, acquiring the daily continuous operation Time of the heat pump unit for n days; and adjusting the maximum operating frequency of the compressor and the set water temperature according to the Time.
The set water temperature refers to a target outlet water temperature set by a user.
The controller continuously records various operating parameters of the unit. The controller automatically acquires the operation parameters of the heat pump unit, such as the set water temperature of a user, the daily continuous operation Time of n days before the heat pump unit and the operation Time ratio of the compressor in different frequency sections; and detecting the numerical value of the current sensor of the compressor to calculate the power of the compressor and the like.
When the actual output load of the heat pump unit every n days before is in a stable state, namely the required load of the building every n days before is in a stable state, the heat pump unit enters an energy-saving mode at the moment, and the highest operation frequency and the set water temperature of the compressor can be directly adjusted according to the continuous operation Time of every day, so that the purposes of simplifying control, saving energy and ensuring user comfort are achieved.
In this embodiment, when the variation range of the daily continuous operation time of the heat pump unit n days before the heat pump unit is within the preset range from the previous day, and the variation range of the daily set water temperature of the previous n days before the previous day is within the preset range from the previous day, it is determined that the daily actual output load of the heat pump unit n days before the heat pump unit is in a stable state, and the heat pump unit enters the energy saving mode.
When the change width of the daily continuous operation time from the previous day is within the preset range, it is indicated that the daily continuous operation time is not changed much even though it is changed, and the daily continuous operation time can be considered to be stable.
When the change width of the daily set water temperature from the previous day is within the preset range, it is described that the daily set water temperature does not change much even though it changes, and the daily set water temperature is considered to be stable.
Therefore, when the change range of the daily continuous operation time compared with the previous day is within the preset range and the change range of the daily set water temperature compared with the previous day is within the preset range, the daily actual output load of the heat pump unit can be judged to be in a stable state, and the heat pump unit enters an energy-saving mode. By adopting the judgment conditions, whether the daily actual output load of the heat pump unit is stable or not can be accurately judged, and the energy-saving mode can be accurately entered.
In this embodiment, when the variation range of the daily continuous operation time of the heat pump unit n days before the heat pump unit is not within the preset range from the previous day, or the variation range of the daily set water temperature of the previous n days before the previous day is not within the preset range from the previous day, or the variation range of the daily power consumption of the compressor n days before the previous day is not within the preset range from the previous day, it is determined that the daily actual output load of the heat pump unit n days before the heat pump unit is in an unstable state, and the heat pump unit exits the energy saving mode.
When the change width of the daily continuous operation time as compared with the previous day is not within the preset range, it is indicated that the daily continuous operation time is largely changed, and the daily continuous operation time may be considered to be unstable.
When the change width of the daily set water temperature from the previous day is not within the preset range, it is considered that the daily set water temperature is unstable because the daily set water temperature is largely changed.
When the variation range of the daily power consumption of the compressor from the previous day is not within the preset range, it is said that the daily power consumption varies greatly, and the daily power consumption is considered to be unstable.
Therefore, when the change range of the daily continuous operation time compared with the previous day is not in the preset range, or the change range of the daily set water temperature compared with the previous day is not in the preset range, or the change range of the daily power consumption of the compressor compared with the previous day is not in the preset range, the fact that the daily actual output load of the heat pump unit is in an unstable state can be judged, and the heat pump unit exits the energy-saving mode. By adopting the judgment conditions, whether the daily actual output load of the heat pump unit is stable or not can be accurately judged, and the energy-saving mode can be accurately exited.
In the present embodiment, the preset range is [ -20%, +20% ], and thus, when the variation amplitude is within [ -20%, +20% ], it is indicated that the variation is not large; when the variation amplitude is not within [ -20%, +20% ], the variation is indicated to be large. By selecting the preset range, the daily continuous operation time, the daily set water temperature and the daily change range of the power consumption of the compressor can be accurately judged, and the compressor can accurately enter or exit the energy-saving mode.
When the change width of the daily continuous operation time from the previous day is within [ -20%, +20% ], it is indicated that the daily continuous operation time does not change much.
When the change range of the daily set water temperature is within [ -20%, +20% ] from the previous day, it is indicated that the daily set water temperature does not change much.
When the change range of the daily power consumption of the compressor is within [ -20%, +20% ] compared with the previous day, the change of the daily power consumption of the compressor is not large.
For example, after entering the energy saving mode, the current value of the daily operation of the compressor can be recorded by the compressor current sensor, the power value consumed by the daily compressor can be calculated, when the power consumption of the daily compressor is changed within +/-20% compared with the previous day, the load of the building is considered to be stable as a whole, the energy saving mode can be entered or maintained, and the frequency and the water temperature can be continuously adjusted. When the power consumption of the compressor changes by more than +/-20% compared with the power consumption of the compressor on the previous day, the load of the building is considered to have certain change, the comfort requirement of a user needs to be met firstly, and the energy-saving mode exits.
In the present embodiment, n = 7. Because 7 days is a complete work and rest cycle, including working days and rest days, the water consumption condition of users and the operation condition of the heat pump unit can be completely and comprehensively reflected. Therefore, whether the daily actual output load of the heat pump unit is stable or not can be accurately judged according to the daily continuous operation time of the heat pump unit in the previous 7 days, the daily set water temperature of the previous 7 days and the daily power consumption of the compressor in the previous 7 days.
For example, when the change of the water temperature set by the user within 7 days and the change of the last day of the building are within ± 20%, and the change of the continuous operation time of the heat pump unit per day and the change of the last day of the building are within ± 20%, the daily actual output load of the heat pump unit is determined to be stable, and further the load required by the building is determined to be in a relatively stable state, so that the energy-saving mode can be entered.
In step S2, the method adjusts the maximum operating frequency and the set water temperature of the compressor according to the daily continuous operation Time of the heat pump unit n days before, and specifically includes the following steps, as shown in fig. 2. T1 in fig. 2 represents the first set time period, t2 represents the second set time period, and t3 represents the third set time period.
S20: and under the energy-saving mode, acquiring the daily continuous operation Time of the heat pump unit for n days.
S21: and if the Time is less than or equal to the first set duration, reducing the highest operating frequency of the compressor and the set water temperature.
If the daily continuous operation Time of the heat pump unit is less than or equal to the first set Time, the daily actual output load of the heat pump unit is small, and the load required by a building is considered to be far lower than the rated capacity of the heat pump unit, the maximum operation frequency and the set water temperature of the compressor can be reduced at the moment, so that the purpose of energy conservation is achieved, and the comfort level of a user can be ensured.
In this step, reducing the maximum operating frequency and the set water temperature of the compressor specifically includes:
s211: and judging whether the highest operation frequency of the compressor is reduced to the optimal operation frequency section.
S212: if not, the maximum operation frequency of the compressor is reduced, and the set frequency is reduced every day (for example, the maximum operation frequency is reduced by 10Hz every day).
S213: if yes, the maximum operation frequency of the compressor is already in the optimal operation frequency range, the set water temperature is lowered, and the set value is lowered every day (for example, the set water temperature is lowered by 2 ℃ every day).
That is to say, firstly, the highest operation frequency of the compressor is reduced to the optimal operation frequency section, and then the set water temperature is reduced, so that the purpose of energy saving is achieved, the influence on the stability of the heat pump unit is avoided as much as possible, and the comfort of users is ensured.
Therefore, when the daily continuous operation Time of the heat pump unit is less than or equal to a first set Time, the high-frequency operation of the heat pump unit in the operation Time period can be limited; gradually limiting the highest operation frequency of the heat pump units (such as gradually reducing the highest operation frequency by 10Hz every day), and continuously paying attention to the continuous operation Time value of the subsequent heat pump units every day; when the highest operation frequency of the unit reaches the optimal operation frequency section of the unit, the water temperature set by the user is gradually reduced (for example, the set water temperature is gradually reduced by 2 ℃ every day).
S22: if the first set Time is less than the Time and less than or equal to the second set Time, the highest running frequency of the compressor is reduced, and the set water temperature is maintained.
If the daily continuous operation Time of the heat pump unit is between the first set Time and the second set Time, which indicates that the daily actual output load of the heat pump unit is slightly smaller, the load required by a building is considered to be slightly lower than the rated capacity of the heat pump unit, at the moment, the highest operation frequency of the compressor can be reduced to achieve the purpose of energy conservation, but the set water temperature is kept unchanged to ensure the comfort of users.
In this step, the maximum operating frequency of the compressor is reduced, and the set water temperature is maintained, which specifically includes:
s221: the set water temperature is kept unchanged.
S222: and judging whether the highest operation frequency of the compressor is reduced to the optimal operation frequency section.
S223: if not, the maximum operation frequency of the compressor is reduced, and the set frequency is reduced every day (for example, the maximum operation frequency is reduced by 10Hz every day).
S224: if so, the highest operation frequency of the compressor is maintained after the highest operation frequency of the compressor is in the optimal operation frequency section.
That is to say, the highest operating frequency of the compressor is reduced to the optimal operating frequency section, and the set water temperature is kept unchanged, so that the purpose of energy conservation is achieved, the influence on the stability of the heat pump unit is avoided as much as possible, and the comfort of users is ensured.
Therefore, when the daily continuous operation Time of the heat pump unit is between the first set Time and the second set Time, the highest operation frequency of the heat pump unit can be gradually limited until the highest operation frequency of the heat pump unit reaches the optimal operation frequency section of the heat pump unit; the set water temperature adjustment is not performed.
S23: and if the second set Time is less than the Time and less than or equal to the third set Time, maintaining the highest running frequency of the compressor and the set water temperature.
If the daily continuous operation Time of the heat pump unit is between the second set Time and the third set Time, the daily actual output load of the heat pump unit is relatively proper, and the load required by the building and the rated capacity of the heat pump unit are considered to be in a corresponding level; at this time, the maximum operation frequency of the compressor and the set water temperature are kept unchanged.
S24: if the Time is larger than the third set Time, the highest running frequency of the compressor is recovered to the frequency before the compressor enters the energy-saving mode, and the set water temperature is recovered to the water temperature before the compressor enters the energy-saving mode.
If the daily continuous operation Time of the heat pump unit is larger than the third set Time, the daily actual output load of the heat pump unit is larger, the load required by a building is considered to be higher than the rated capacity of the heat pump unit, the comfort of a user side is possibly influenced, the highest operation frequency and the set water temperature of the compressor are recovered at the moment, and the comfort of the user is ensured.
In this step, the maximum operating frequency of the compressor is restored to the frequency before entering the energy saving mode, and the set water temperature is restored to the water temperature before entering the energy saving mode, which specifically includes:
s241: it is determined whether the maximum operating frequency of the compressor has been restored to the frequency before entering the saving mode.
S242: if not, the highest running frequency of the compressor is recovered to the frequency before entering the energy-saving mode.
S243: if so, the maximum operation frequency of the compressor is recovered, and the set water temperature is recovered to the water temperature before entering the energy-saving mode.
That is to say, the highest operating frequency of the compressor is firstly recovered to the frequency before entering the energy-saving mode, and then the set water temperature is recovered to the water temperature before entering the energy-saving mode, so that the purpose of energy saving is achieved, the influence on the stability of the heat pump unit is avoided as much as possible, and the comfort of a user is ensured.
Therefore, when the daily continuous operation Time of the heat pump unit is greater than the third set Time, the highest operation frequency of the compressor needs to be recovered firstly, and then the set water temperature is recovered to the water temperature before entering the energy-saving mode if the daily continuous operation Time of the heat pump unit still exceeds the third set Time.
Through design S21 ~ S24, it is more reasonable to refine energy-conserving mode, guarantees the basis of user' S travelling comfort, promotes the energy-conserving effect of unit, and moreover, application scope is wider.
In the present embodiment, the first set time period is 6 hours, the second set time period is 12 hours, and the third set time period is 18 hours. By selecting the three values, the actual output load of the unit can be accurately judged according to the Time of the daily continuous operation Time, and whether the maximum operation frequency of the compressor is adjusted or not and the set water temperature are accurately judged.
That is to say that the first and second electrodes,
if the Time is less than or equal to 6 hours, reducing the highest operating frequency of the compressor and the set water temperature.
If the Time is more than 6 hours and less than or equal to 12 hours, the highest running frequency of the compressor is reduced, and the set water temperature is maintained.
If the Time is more than 12 hours and less than or equal to 18 hours, the highest running frequency and the set water temperature of the compressor are maintained.
If the Time is more than 18 hours, the highest operation frequency of the compressor is recovered to the frequency before the compressor enters the energy-saving mode, and the set water temperature is recovered to the water temperature before the compressor enters the energy-saving mode.
Aiming at the energy-saving mode of the air source heat pump heating unit, the heat pump unit records the operation time, the operation frequency and the set water temperature of the unit, the daily required load of a building is estimated by detecting parameters such as the set water temperature of a user, the daily continuous operation time of the unit and the like, when the daily load of the building is in a stable state within seven days and the load of the building is lower than the rated capacity of the unit, the highest operation frequency is limited, and the energy consumption increase caused by the high-frequency operation of the unit is reduced; and then the set water temperature is adjusted, so that the energy consumption increase caused by the high water temperature operation of the unit is reduced. The heat pump unit of this embodiment carries out frequency control and sets for the temperature control according to building load demand to improve the holistic operating efficiency of unit.
In this embodiment, the control strategy executed by the controller of the heat pump unit is applicable to an air source heat pump heating unit, not only to a variable frequency heat pump system, but also to a constant speed heat pump system; for a fixed speed heat pump system, the optimal operating frequency band is 50 Hz.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (10)
1. A heat pump unit, comprising:
a controller configured to:
when the daily actual output load of the heat pump unit is in a stable state n days before the heat pump unit, the heat pump unit enters an energy-saving mode;
under an energy-saving mode, acquiring the daily continuous operation Time of the heat pump unit for n days; and adjusting the maximum operating frequency of the compressor and the set water temperature according to the Time.
2. The heat pump unit of claim 1, wherein the adjusting of the maximum operating frequency and the set water temperature of the compressor according to the Time specifically comprises:
if the Time is less than or equal to the first set duration, reducing the highest running frequency of the compressor and the set water temperature;
if the first set Time is less than the Time and less than or equal to the second set Time, reducing the highest running frequency of the compressor and maintaining the set water temperature;
if the second set Time is less than the Time and less than or equal to the third set Time, maintaining the highest running frequency of the compressor and the set water temperature;
if the Time is larger than the third set Time, the highest running frequency of the compressor is recovered to the frequency before the compressor enters the energy-saving mode, and the set water temperature is recovered to the water temperature before the compressor enters the energy-saving mode.
3. The heat pump unit of claim 2, wherein if the Time is less than or equal to a first set duration, the maximum operating frequency and the set water temperature of the compressor are reduced, and the method specifically comprises the following steps:
judging whether the highest operation frequency of the compressor is reduced to an optimal operation frequency section;
if not, reducing the highest running frequency of the compressor;
if yes, the set water temperature is lowered.
4. The heat pump unit of claim 2, wherein if the first set Time is less than the Time and less than or equal to the second set Time, the maximum operating frequency of the compressor is reduced, and the set water temperature is maintained, specifically comprising:
keeping the set water temperature unchanged;
judging whether the highest operation frequency of the compressor is reduced to an optimal operation frequency section;
if not, reducing the highest running frequency of the compressor;
if so, the maximum operating frequency of the compressor is maintained.
5. The heat pump unit of claim 2, wherein if the Time is greater than a third set duration, the maximum operating frequency of the compressor is restored to the frequency before entering the energy saving mode, and the set water temperature is restored to the water temperature before entering the energy saving mode, specifically comprising:
judging whether the highest running frequency of the compressor is recovered to the frequency before entering the energy-saving mode;
if not, the highest running frequency of the compressor is recovered to the frequency before entering the energy-saving mode;
if so, the set water temperature is restored to the water temperature before entering the energy-saving mode.
6. The heat pump unit of claim 1, wherein when the variation range of the daily continuous operation time of the heat pump unit n days before the heat pump unit is within the preset range compared with the previous day, and the variation range of the daily set water temperature of the previous n days before the previous day is within the preset range, the daily actual output load of the heat pump unit n days before the heat pump unit is determined to be in a stable state, and the heat pump unit enters the energy-saving mode.
7. The heat pump unit of claim 1, wherein when the variation range of the daily continuous operation time of the heat pump unit n days before the heat pump unit is not within the preset range from the previous day, or the variation range of the daily set water temperature of the previous n days is not within the preset range from the previous day, or the variation range of the daily power consumption of the compressor n days before the compressor n days is not within the preset range from the previous day, it is determined that the daily actual output load of the heat pump unit n days before the heat pump unit is in an unstable state, and the heat pump unit exits the energy saving mode.
8. A heat pump unit according to claim 7, characterised in that said predetermined range is [ -20%, +20% ].
9. A heat pump unit according to claim 2, characterised in that the first set period of time is 6 hours, the second set period of time is 12 hours and the third set period of time is 18 hours.
10. A heat pump unit according to any one of claims 1 to 9, characterised in that n = 7.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111386122.5A CN114165942A (en) | 2021-11-22 | 2021-11-22 | Heat pump set |
| PCT/CN2022/099951 WO2023087700A1 (en) | 2021-11-17 | 2022-06-20 | Multi-connected system and control method thereof |
| CN202280039424.1A CN117413151A (en) | 2021-11-17 | 2022-06-20 | Multi-split system and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111386122.5A CN114165942A (en) | 2021-11-22 | 2021-11-22 | Heat pump set |
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| CN114165942A true CN114165942A (en) | 2022-03-11 |
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| CN202111386122.5A Pending CN114165942A (en) | 2021-11-17 | 2021-11-22 | Heat pump set |
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