CN115183465A - Control method and control device for heat pump water heater, heat pump water heater and storage medium - Google Patents
Control method and control device for heat pump water heater, heat pump water heater and storage medium Download PDFInfo
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- CN115183465A CN115183465A CN202210716067.XA CN202210716067A CN115183465A CN 115183465 A CN115183465 A CN 115183465A CN 202210716067 A CN202210716067 A CN 202210716067A CN 115183465 A CN115183465 A CN 115183465A
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- water
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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
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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
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/212—Temperature of the water
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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
- 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
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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
- 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
Abstract
The application relates to the technical field of heat pump water heaters, and discloses a control method for a heat pump water heater, which comprises the following steps: controlling n units of the heat pump water heater to operate to heat water in the water tank; stopping the operation of all the units under the condition that the water temperature reaches the set temperature; starting the m units to operate under the condition that the water temperature is reduced from the set temperature to the first temperature, and heating the water in the water tank; and starting the w units to operate under the condition that the water temperature is reduced from the first temperature to the second temperature, and heating the water in the water tank. And (3) controlling all units of the heat pump water heater to operate, and stopping all units after the water temperature of the water tank reaches the set temperature. When the water temperature is reduced, partial units are started to heat water in the water tank according to the reduction degree of the water temperature. The machine set of the heat pump water heater is prevented from being repeatedly started and stopped at the same time, and the control on the heat pump water heater is more flexible. The application also discloses a control device, a heat pump water heater and a storage medium for the heat pump water heater.
Description
Technical Field
The present invention relates to the field of heat pump water heaters, and in particular, to a control method and a control device for a heat pump water heater, and a storage medium.
Background
At present, when a plurality of heat pump water heaters jointly run to produce hot water, necessary parameters are manually set on a controller, so that the set temperature of a water tank is obtained, and the start and stop of a unit are controlled. When the temperature of the water tank is higher than the set temperature, the unit is stopped, and when the temperature of the water tank is lower than a certain temperature, the unit is completely started again to improve the water temperature.
In order to solve the problem of setting the starting and stopping of a water tank temperature control unit when a plurality of heat pump water heaters are operated in a combined mode to produce hot water, the related technology discloses a control method of the heat pump water heaters, which comprises the following steps:
acquiring the temperature of cold water, the ambient temperature, the number of users and the water consumption of each person;
automatically judging the temperature of water according to the environment temperature;
calculating a reference heating temperature of the heat pump water heater according to the number of users, the total water consumption of the users, the water temperature and the cold water temperature, wherein the total water consumption of the users is obtained according to the number of the users and the water consumption of each person; and judging whether the reference heating temperature is lower than the water use temperature, if so, setting the water use temperature as the heating temperature of the heat pump water heater, and controlling the heat pump water heater to operate according to the heating temperature.
In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:
although the related art can set the starting and stopping of the water tank temperature control unit when a plurality of heat pump water heaters jointly operate to produce hot water, the starting and stopping of the control unit are too stiff and inflexible. When the temperature of the water tank is higher than the set temperature, the unit is completely stopped, and when the temperature of the water tank is lower than a certain temperature, the unit is completely restarted to raise the water temperature. When the temperature of the set water tank is too low and the hot water is too much, the unit can be started and stopped frequently. Such a control method is simple and inflexible and is not flexible enough.
Disclosure of Invention
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.
The embodiment of the disclosure provides a control method and a control device for a heat pump water heater, the heat pump water heater and a storage medium. When a plurality of heat pump water heaters jointly operate to produce hot water, the heat pump water heaters can be more flexibly controlled.
In some embodiments, the control method comprises:
controlling n units of the multi-connected heat pump water heater to operate, and heating water in the water tank; stopping the operation of all the units under the condition that the water temperature reaches a set temperature T; starting the m units to operate under the condition that the water temperature is reduced from the set temperature T to a first temperature T1, and heating the water in the water tank; starting w units to operate under the condition that the water temperature is reduced from a first temperature t1 to a second temperature t2, and heating the water in the water tank; wherein T is more than T1 and more than T2, n, m and w are positive integers, and n is more than or equal to w and more than or equal to m is more than or equal to 1.
In some embodiments, the control device includes a processor and a memory storing program instructions. The processor is configured to execute the aforementioned control method for a heat pump water heater when executing the program instructions.
In some embodiments, the heat pump water heater comprises the aforementioned control device for a heat pump water heater.
In some embodiments, a storage medium stores program instructions. The program instructions, when executed, perform the aforementioned control method for a heat pump water heater.
The control method and the control device for the heat pump water heater, the heat pump water heater and the storage medium provided by the embodiment of the disclosure can realize the following technical effects:
and controlling all units of the heat pump water heater to operate, heating water in the water tank, and stopping all units after the water temperature reaches the set temperature. When the water temperature is reduced, part of the units are started to heat the water in the water tank according to the reduction degree of the water temperature. Therefore, the unit of the heat pump water heater is prevented from being repeatedly started and stopped at the same time, and the control on the heat pump water heater is more flexible. And like this part unit operation, the operation mode of part unit dormancy has reduced the energy consumption, has practiced thrift the energy.
Optionally, the starting the m units to operate includes starting the m units and operating at a first frequency f1 when the current time is in a set time period; starting the m units and operating at a second frequency f2 under the condition that the current time is not in a set time interval; wherein f2> f1.
Optionally, m =1.
Optionally, the m units are the units with the shortest running time.
Optionally, the starting w machine group running comprises starting w-m machine group running under the condition of keeping m machine group running.
Optionally, after the w units are started to operate, the method further includes starting all the units to operate under the condition that the water temperature is reduced from the second temperature t2 to the third temperature t3, and heating the water in the water tank.
Optionally, the control method for the heat pump water heater further comprises obtaining a tank temperature T according to Q = CM (T-Ta); wherein Q is the heat released by the water in the water tank, ta is the reference temperature, C is the specific heat capacity, and M is the water flow of the water tank.
Optionally, the control method for the heat pump water heater further comprises setting a water tank level.
Optionally, the setting of the water level of the water tank comprises obtaining the number of appointment persons in the place on the day; determining the maximum number of persons staying in the place on the same day according to the number of persons reserved on the place on the same day; and setting the water level of the water tank according to the maximum number of people entering the place on the same day.
Optionally, the determining the maximum number of persons who live in the place on the day according to the number of reserved persons on the place on the day comprises: and weighting the reserved persons in the place on the same day to obtain the maximum number of persons staying in the place on the same day.
Optionally, setting the water level of the water tank according to the maximum number of people entering the place on the day comprises determining the number of people in the place; and setting the water level of the water tank as the water level corresponding to the number of people according to a preset corresponding relation.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:
FIG. 1 is a schematic diagram of a heat pump water heater system;
fig. 2 is a schematic diagram of a control method for a heat pump water heater according to an embodiment of the disclosure;
FIG. 3 is a schematic diagram of another control method for a heat pump water heater according to an embodiment of the disclosure;
FIG. 4 is a schematic diagram of another control method for a heat pump water heater according to an embodiment of the disclosure;
fig. 5 is a schematic diagram of another control method for a heat pump water heater according to an embodiment of the disclosure;
fig. 6 is a schematic diagram of a control device for a heat pump water heater according to an embodiment of the disclosure.
Detailed Description
So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.
The terms "first," "second," and the like in the description and in the claims, and the above-described drawings of embodiments of the present disclosure, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.
The term "plurality" means two or more, unless otherwise specified.
In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an or relationship. For example, A/B represents: a or B.
The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. For example, a and/or B, represents: a or B, or A and B.
The term "correspond" may refer to an association or binding relationship, and a corresponds to B refers to an association or binding relationship between a and B.
Fig. 1 shows a structure of a heat pump water heater system. The heat pump water heater system comprises n units 101, a water tank 102, a variable frequency water pump 103, a control valve 104, a drain valve 105, a temperature sensor 106 and a water level control device (not shown in the figure). The heat pump water heater further comprises a processor (not shown in the figure). The processor is configured to control the operation of the n units.
The variable frequency water pump is arranged on a water pipe between the unit 101 and the water tank 102 and a water pipe between the water tank 102 and a user end. The frequency of the variable frequency water pump is changed to control the rotating speed of the variable frequency water pump, so that the water flow is adjusted. The operation of the n units is controlled, and water obtained from a tap water end 107 in the water tank is heated. The heated water is supplied to the user terminal 108 as domestic water.
In conjunction with the heat pump water heater shown in fig. 1, embodiments of the present disclosure provide a control method for a heat pump water heater. As shown in fig. 2, the method includes:
s201, the processor controls n units of the heat pump water heater to operate, and water in the water tank is heated.
And S202, stopping the operation of all units by the processor under the condition that the water temperature reaches the set temperature T.
S203, when the water temperature is reduced from the set temperature T to the first temperature T1, the processor starts the m units to operate, and heats the water in the water tank.
S204, under the condition that the water temperature is reduced from the first temperature t1 to the second temperature t2, the processor starts w units to operate, and water in the water tank is heated.
Wherein T is more than T1 and more than T2, n, m and w are positive integers, and n is more than or equal to w and more than or equal to m is more than or equal to 1.
By adopting the control method for the heat pump water heater provided by the embodiment of the disclosure, all units of the heat pump water heater are controlled to operate, water in the water tank is heated, and the operation of all units is stopped after the water temperature reaches the set temperature. When the water temperature is reduced, part of the units are started to heat the water in the water tank according to the reduction degree of the water temperature. Therefore, the unit of the heat pump water heater is prevented from being repeatedly started and stopped at the same time, and the control on the heat pump water heater is more flexible. And like this part unit operation, the operation mode of part unit dormancy has reduced the energy consumption, has practiced thrift the energy.
Optionally, starting the m units to operate includes starting the m units and operating at the first frequency f1 when the current time is in the set time period; and starting the m units and operating at a second frequency f2 under the condition that the current time is not in the set time interval. Wherein f2> f1.
The set time period is set by the user, and is generally set to a low peak time period when hot water is used. For example, in the case where the place of use is a hotel, the set time period is 0 o 'clock to 6 o' clock. In the case where the place of use is a library, the set period is 18 o 'clock to 8 o' clock on the next day.
The first frequency f1 may be the lowest frequency of the heat pump water heater, and the second frequency f2 may be the highest frequency of the heat pump water heater.
The m units are started and run at the highest frequency in the peak period of using hot water, so that the speed of hot water production of the heat pump hot water machine can be the fastest, and the hot water use by a user is not delayed. And m units are started and run at the lowest frequency in the low peak period of using hot water, so that the water temperature of the heat pump water heater can be slowly increased and maintained, and the heat pump water heater is prevented from being stopped for many times under the condition of less number of people using hot water. Therefore, the operation of the heat pump water heater unit can be controlled more flexibly.
Optionally, m =1.
Therefore, resources can be saved better. When the water temperature begins to drop, if all the units are started, resources are wasted if the water temperature is larger than the water temperature. Only one unit is needed to be started, and the requirement of water production can be met.
Optionally, the m units are the units with the shortest running time.
The number of the units of the heat pump water heater is n, and when the units of the heat pump water heater are controlled to operate, each unit is started in turn. In this way, the running time of each unit is different, which results in a shorter service life of the individual units. In order to prolong the service life of the heat pump water heater, the set started each time is the set with the shortest total running time.
For example, when a plurality of heat pump water heaters are operated in combination to produce hot water, 3 units are provided. The water temperature is reduced to 60 degrees from the set temperature of 65 degrees, and the No. 1 unit is started at the moment. With the use of hot water, the water temperature is reduced from 60 degrees to 55 degrees, and the No. 2 unit is started while the No. 1 unit is kept running. And the water temperature continues to drop due to excessive water consumption, and the No. 3 unit is started while the No. 1 unit and the No. 2 unit are kept running. Then the water temperature is increased back to the set temperature of 65 ℃, and 3 units are controlled to stop running. After a period of time, the water temperature drops again, and at the moment, the number 3 unit is started first. Since unit number 3 has the shortest run time in the previous run. In order to guarantee the service life of each unit by averaging the running time of each unit, the No. 3 unit with the shortest running time is started.
Therefore, the running time of each unit can be better guaranteed to be average, and the service life of each unit is guaranteed.
Optionally, initiating w fleet operations comprises initiating w-m fleet operations while maintaining m fleet operations.
For example, the water temperature is decreased from the set temperature, and 1 unit is started. The water temperature continues to drop, which indicates that the speed of 1 unit for operating the hot water can not meet the requirements of users, and at the moment, 3 units are started. These three units include the 1 unit that has been turned on. I.e. in case of keeping 1 unit running, 2 unit runs are added.
Therefore, the operation of the heat pump water heater can be controlled more flexibly. The starting number of the units is controlled according to the requirement, and the units are not started simultaneously to operate the water heating. Therefore, the operation of part of the units and the dormant operation mode of part of the units can reduce energy consumption and save resources.
Optionally, after the w units are started to operate, in the case that the water temperature is reduced from the second temperature t2 to the third temperature t3, all the units are started to operate, and the water in the water tank is heated.
Referring to fig. 3, another control method for a heat pump water heater is provided in an embodiment of the present disclosure, including:
s301, the processor controls n units of the heat pump water heater to operate to heat water in the water tank.
And S302, stopping the operation of all the units by the processor under the condition that the water temperature reaches the set temperature T.
And S303, under the condition that the water temperature is reduced from the set temperature T to the first temperature T1, the processor starts the m units to operate, and heats the water in the water tank.
S304, under the condition that the water temperature is reduced from the first temperature t1 to the second temperature t2, the processor starts w units to operate, and water in the water tank is heated.
And S305, starting all units to operate by the processor to heat the water in the water tank under the condition that the water temperature is reduced from the second temperature t2 to the third temperature t 3.
The falling speed of the water temperature from the second temperature t2 to the third temperature t3 is too high, and all units need to be started to operate so as to meet the current requirement.
For example, when a plurality of heat pump water heaters are operated in combination to produce hot water, 4 units are provided. The water temperature is reduced from 65 ℃ to 60 ℃ within 30 minutes, and the No. 1 unit is started at the moment. With the use of hot water, the water temperature is reduced from 60 ℃ to 55 ℃ within 30 minutes, and the No. 2 unit is started while the No. 1 unit is kept running. The water temperature drops rapidly from 55 to 45 degrees in 30 minutes due to excessive water consumption. At the moment, only one unit is added, the current requirement for heating hot water is difficult to meet, and then all units are started to operate to heat water.
Therefore, when the water temperature is reduced slowly, the control part of the units operates in sequence. When the water temperature is decreased quickly, all the units are controlled to operate simultaneously. The heat pump water heater can be more effectively controlled to operate as required, and the heat pump water heater can be more flexibly controlled.
Optionally, the control method for the heat pump water heater further comprises setting the water tank temperature T.
Referring to fig. 4, another control method for a heat pump water heater is provided in an embodiment of the present disclosure, including:
s401, the processor sets the water tank temperature T.
S402, the processor controls n units of the heat pump water heater to operate, and water in the water tank is heated.
And S403, stopping the operation of all the units by the processor when the water temperature reaches the set temperature T.
S404, under the condition that the water temperature is reduced to a first temperature T1 from a set temperature T, the processor starts m units to operate, and water in the water tank is heated.
S405, under the condition that the water temperature is reduced from the first temperature t1 to the second temperature t2, the processor starts w units to operate, and water in the water tank is heated.
Therefore, the operation of the heat pump water heater can be controlled more flexibly, and the temperature of the water tank can be automatically set by using the control device of the heat pump water heater. The temperature of the water tank is set without manual operation, manpower is liberated, and resources are saved.
Optionally, setting the tank temperature T comprises obtaining the tank temperature T according to Q = CM (T-Ta); wherein Q is the heat released by the water in the water tank, ta is the reference temperature, C is the specific heat capacity, and M is the water flow of the water tank.
The water in the water tank gives off heat Q equal to the heat Q 'absorbed by the tap water, i.e. CM (T-Ta) = CM' (Ta-T). Wherein M' is the flow rate of tap water, and t is the temperature of tap water.
The reference temperature Ta is the average temperature of the user water, which is obtained by counting large data.
t is the temperature of tap water. And a temperature sensor is arranged at a tap water outlet of the user side and is used for acquiring the temperature of tap water.
For example, statistical big data gives the average temperature of seasonal user water usage. In 6 to 8 months in northern China, the average temperature of water used by a user is 37 ℃, the temperature of tap water is 20 ℃, the water flow of the tap water is 1m < 3 >/h, and the water flow of a hot water tank is 1m < 3 >/h according to statistical big data. It is available from Q = CM (T-Ta) = Q '= CM' (Ta-T), 1 × (T-37) =1 × (37-20), T =54 ℃, whereby it is obtained that the temperature of the hot water tank needs to be set to 54 ℃.
Optionally, setting the tank temperature T comprises manually entering the set temperature.
Thus, the user can freely set the temperature of the water tank meeting the self requirement.
Optionally, the control method for the heat pump water heater further comprises setting a water tank level.
With reference to fig. 5, another control method for a heat pump water heater is provided in an embodiment of the present disclosure, including:
s501, the processor sets the water level of the water tank.
S502, the processor controls n units of the heat pump water heater to operate to heat water in the water tank.
And S503, stopping the operation of all the units by the processor when the water temperature reaches the set temperature T.
And S504, under the condition that the water temperature is reduced to the first temperature T1 from the set temperature T, the processor starts the m units to operate, and heats the water in the water tank.
And S505, under the condition that the water temperature is reduced from the first temperature t1 to the second temperature t2, the processor starts w units to operate to heat the water in the water tank.
Therefore, the operation of the heat pump water heater can be controlled more flexibly, and the water level of the water tank can be automatically set by using the control device of the heat pump water heater. Reasonable water injection is carried out on the water tank, so that water resources are saved, and waste is avoided.
Optionally, setting the tank water level comprises:
and S511, acquiring the number of the reserved persons in the place on the same day.
And S512, determining the maximum number of persons staying in the place on the same day according to the number of persons reserved on the place on the same day.
And S513, setting the water level of the water tank according to the maximum number of persons staying in the place on the day.
Taking a heat pump water heater in a hotel as an example, a control device of the heat pump water heater is connected with a reservation check-in system of the hotel. The control device of the heat pump water heater can acquire the number of persons reserved today from a reservation check-in system of a hotel, and the number of persons is the number of persons reserved in the same place on the same day. And then the maximum number of persons staying in the place on the same day is determined according to the number of persons reserved on the place on the same day, so as to set the water level of the water tank.
Therefore, the water level of the water tank can be set according to the number of persons in the place reserved on the same day, manual operation is not needed for setting the water level of the water tank, manpower is liberated, and resources are saved.
Optionally, setting the tank level comprises setting the tank level according to the season in which it is located.
Take a heat pump water heater in a hotel as an example. In summer, the hotel has the most water consumption and corresponds to a high-grade water level. In spring and autumn, the water consumption of the hotel is less than that of summer, and corresponds to a middle gear. In winter, the water consumption of the hotel is minimum, and the hotel corresponds to a low gear.
Thus, the water level of the water tank is set, and the water level of the water tank is set only at the beginning of each season without setting for multiple times. The operation of setting the water level of the water tank is simple and convenient.
Optionally, setting the tank level comprises setting the tank level according to a peak water usage period and a low water usage period.
Take a heat pump water heater in an office building as an example. The water consumption peak period of the office building is from 7 to 20, and the water consumption peak period is from 20 to 7 in the next day. And setting the water level of the water tank as a high gear when the water consumption peak period is from 7 to 20. And setting the water level of the water tank to be a low gear from 20 o 'clock to 7 o' clock on the next day.
The water level of the water tank is set, the water level control gear of the heat pump water heater is two gears at least, and the selectable models of the heat pump water heater are more.
Optionally, determining the maximum number of persons in the place on the day according to the number of reserved persons on the place on the day comprises weighting the number of reserved persons on the place on the day to obtain the maximum number of persons in the place on the day.
The maximum number of persons staying in the place on the day is obtained by multiplying the number of reserved persons on the place on the day by a coefficient. The coefficient can be obtained by statistics of big data of the past year, and the number of actual persons who live in the space is more or less than the number of reserved persons in different seasons, holidays, ordinary dates and the like, so that a coefficient is obtained to determine the maximum number of persons who live in the space on the day.
The maximum number of people staying in the place on the day is more accurate, and a foundation is laid for reasonably setting the water level later.
Optionally, setting the water level of the water tank according to the maximum number of people entering the place on the day comprises determining the number of people in the place; and setting the water level of the water tank as the water level corresponding to the number of people according to a preset corresponding relation.
And dividing the number of people intervals according to the wish of the user, wherein the number of the people intervals is equal to the number of the water level control gears of the water tank. And matching the maximum number of people who live in the place to the corresponding people number interval. And setting the water level of the water tank according to the corresponding relation between the preset number of people and the water level of the water tank.
For example, the water tank is provided with 4-level water level control, and the number of people is divided into 4 different sections. 76-100, 51-75, 26-50, 0-25. Each number of people interval corresponds to different water levels. 76-100 persons correspond to the full water level, 51-75 persons correspond to 3/4 of the full water level, 26-50 persons correspond to 1/2 of the full water level, and 0-25 persons correspond to 1/4 of the full water level. When the number of people is 90 on the day, the water level of the water tank is set to be full. When the number of people is 70 at most on the day, the water level of the water tank is set to be 3/4 of the full water level.
The water level of the water tank is set more reasonably, and different people can supply water according to different water levels. The waste of water resources can be avoided.
In practical application, a plurality of heat pump water heaters are combined to operate to produce hot water, and the hot water is widely used for producing domestic sanitary hot water in markets, hotels, supermarkets, office places and the like.
Referring to fig. 1, taking a heat pump water heater in a hotel as an example, a control device of the heat pump water heater is connected to a reservation stay system of the hotel to obtain 200 persons for reserving the hotel in 5 months and 1 day. According to statistics of the number of people who check in the past year in 5 months and 1 day, the maximum number of people who check in the past year in 5 months and 1 day is 2.5 times of the number of reserved people, so that the maximum number of people who check in the hotel in the past year in 5 months and 1 day is 500. The heat pump water heater of the hotel has 4-level water level control, namely full water level, 3/4 full water level, 1/2 full water level and 1/4 full water level. The hotel can contain at most 600 persons, and the water level is set to be full when the number of persons who live in the hotel is 451-600 persons at most in advance. The water level is 3/4 of full water level when the number of people who live in the water tank is 301-450 people at most. When the number of people who live in the water tank is 151-300 people at most, the water level is 1/2 of the full water level. The water level is 1/4 of the full water level when the number of people is 0-150 at most. In 5 months and 1 day, the maximum number of people who enter the hotel is 500, and in the interval of 451 to 600 people, the water tank is set to be full of water level.
This hotel running water delivery port position is provided with temperature sensor for acquire the temperature of running water. In 12 months to 3 months in the next year in northern China, big data are counted to obtain that the average temperature of water used by seasonal users is 40 ℃, the temperature of tap water is 15 ℃, and the water flow of the tap water is 1m 3 H, the water flow of the hot water tank is 1.5m 3 H is used as the reference value. I.e., the reference temperature Ta is 40 ℃,1.5 × (T-40) =1 × (40-15), obtainable from Q = CM (T-Ta) = Q '= CM' (Ta-T), whereby the temperature of the hot water tank needs to be set to 57 ℃.
The heat pump water heater of the hotel is provided with 6 units. And 5 months and 1 day, 6 units of the heat pump water heater are controlled to operate to heat water in the water tank. And at 10 o' clock at night, the temperature of the water tank reaches the set temperature of 57 ℃, and the operation of all the units is stopped. At this point, the hotel is on-peak. When the temperature of the water tank is reduced to 55 ℃ in 30 minutes along with the use of hot water, the No. 1 unit can be started firstly to run at the highest frequency so as to improve the water temperature. After another 30 minutes, the water temperature is reduced to 53 ℃ again at 55 ℃, at the moment, the unit 1 is kept running, and then the unit 2 is started to run at the highest frequency to improve the water temperature. However, when the temperature of the water tank is reduced to 48 ℃ in 30 minutes, the water temperature is reduced too fast, and all the units from No. 1 to No. 6 are required to operate at the highest frequency to increase the water temperature. When the water temperature reaches the set temperature 57 ℃ again, the machine set is shut down completely. The heat pump water heater of the hotel is set to operate at the lowest frequency from 1 point to 7 points in the morning. No one uses hot water at 2 am, and the water temperature drops very slowly. When the water temperature is reduced, a group of heat pump water heaters are started to raise the water temperature at the lowest frequency. At this time, the starting unit starts from the 6 # unit, because the 1 # unit is started first last time, the running time is longest. This time starts to open from the 6 th unit, and the running time of each unit is guaranteed to be average.
As shown in fig. 6, an embodiment of the present disclosure provides a control device for a heat pump water heater, which includes a processor (processor) 600 and a memory (memory) 601. Optionally, the apparatus may also include a Communication Interface 602 and a bus 603. The processor 600, the communication interface 602, and the memory 601 may communicate with each other via a bus 603. The communication interface 602 may be used for information transfer. The processor 600 may invoke logic instructions in the memory 601 to execute the control method for the heat pump water heater of the above-described embodiment.
In addition, the logic instructions in the memory 601 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as a stand-alone product.
The memory 601 is a storage medium and can be used for storing software programs, computer executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 600 executes functional applications and data processing by executing program instructions/modules stored in the memory 601, namely, implements the control method for the heat pump water heater in the above-described embodiment.
The memory 601 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal device, and the like. In addition, the memory 601 may include a high speed random access memory, and may also include a non-volatile memory.
The embodiment of the disclosure provides a heat pump water heater, which comprises n units and further comprises the control device for the heat pump water heater.
The disclosed embodiments provide a storage medium storing computer-executable instructions configured to perform the above-described method for controlling an air conditioner.
The storage medium described above may be a transitory computer-readable storage medium or a non-transitory computer-readable storage medium. A non-transitory storage medium comprising: a U-disk, a portable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other media capable of storing program codes, and may also be a transient storage medium.
The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. Furthermore, the words used in the specification are words of description only and are not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, the terms "comprises" and/or "comprising," when used in this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising a" \8230; "does not exclude the presence of additional like elements in a process, method or apparatus comprising the element. In this document, each embodiment may be described with emphasis on differences from other embodiments, and the same and similar parts between the respective embodiments may be referred to each other. For methods, products, etc. of the embodiment disclosure, reference may be made to the description of the method section for relevance if it corresponds to the method section of the embodiment disclosure.
Claims (10)
1. A control method for a heat pump water heater including n banks, characterized by comprising:
controlling n units of the heat pump water heater to operate to heat water in the water tank;
stopping the operation of all units under the condition that the water temperature reaches the set temperature T;
starting the m units to operate under the condition that the water temperature is reduced from the set temperature T to a first temperature T1, and heating the water in the water tank;
under the condition that the water temperature is reduced from a first temperature t1 to a second temperature t2, starting w units to operate, and heating the water in the water tank;
wherein T is more than T1 and more than T2, n, m and w are positive integers, and n is more than or equal to w and more than or equal to m is more than or equal to 1.
2. The control method of claim 1, wherein said initiating m banks to operate comprises:
starting m units and running at a first frequency f1 under the condition that the current time is in a set time interval;
starting the m units and operating at a second frequency f2 under the condition that the current time is not in a set time interval;
wherein f2> f1.
3. The control method according to claim 2, characterized in that m =1.
4. The control method according to claim 1, wherein the m units are the units having the shortest running time.
5. The control method according to claim 1, wherein the starting w units to operate comprises:
and starting w-m machine sets to run under the condition of keeping m machine sets running.
6. The control method according to any one of claims 1 to 5, wherein after starting the operation of the w units, the method further comprises:
and starting all the units to operate under the condition that the water temperature is reduced from the second temperature t2 to the third temperature t3, and heating the water in the water tank.
7. The control method according to any one of claims 1 to 5, characterized by further comprising:
obtaining a water tank temperature T according to Q = CM (T-Ta);
wherein Q is the heat released by the water in the water tank, ta is the reference temperature, C is the specific heat capacity, and M is the water flow of the water tank.
8. A control device for a heat pump water heater, comprising a processor and a memory storing program instructions, characterized in that the processor is configured to execute the control method for a heat pump water heater according to any one of claims 1 to 5 when executing the program instructions.
9. A heat pump water heater comprising n units and a water tank, characterized by further comprising a control device for the heat pump water heater according to claim 8.
10. A storage medium storing program instructions, characterized in that the program instructions, when executed, perform a control method for a heat pump water heater according to any one of claims 1 to 5.
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