CN112629022A - Multi-split water heater control method and device and multi-split water heater - Google Patents
Multi-split water heater control method and device and multi-split water heater Download PDFInfo
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- CN112629022A CN112629022A CN202011542966.XA CN202011542966A CN112629022A CN 112629022 A CN112629022 A CN 112629022A CN 202011542966 A CN202011542966 A CN 202011542966A CN 112629022 A CN112629022 A CN 112629022A
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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
- 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
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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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
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Abstract
The invention discloses a control method and a control device for a multi-connected hot water machine and the multi-connected hot water machine, wherein the method comprises the following steps: determining a target temperature of a hot water tank when the hot water mode is operated; determining starting time intervals of a plurality of heat pump outdoor units according to the target temperature; and controlling the plurality of heat pump outdoor units to be started in sequence according to the starting time interval. The invention solves the problem of poor user experience caused by insufficient intelligence of the multi-connected water heater control in the prior art, and improves the comfort of the user and the energy saving performance of the unit.
Description
Technical Field
The invention relates to the technical field of water heaters, in particular to a multi-split water heater control method and device and the multi-split water heater.
Background
The large-cooling-capacity multifunctional water heater is put on the market, and the large-cooling-capacity multifunctional water heater is a small-cooling-capacity multifunctional water heater. The difference between the two is that the multifunctional water heater with small cooling capacity can be flexibly configured in various house villas due to small cooling capacity, specifically, the multifunctional water heater is one machine, the water system is relatively independent, and the mode can be flexibly configured; the condition that one machine has multiple functions is considered for large cooling capacity, a water system becomes relatively complex, and the problem of disordered operation of the water system caused by control delay and mode switching is considered in actual control.
Moreover, because the thread of the water outlet end and the user side is too long at present, no central command system uniformly coordinates the whole waterway system, the water temperature of the water tank is influenced by various requirements of the user group from the group-controlled external machine to the ton-level water tank and then to the user group, the temperature of the water tank is indirectly raised to be unstable, the normal heating curve process is disturbed, the output of the external machine end is indirectly unstable, and therefore, the unnecessary abrasion of the accessories such as a compressor and the like which breaks through the limit use range is easily caused, and the long-term use reliability of the external machine group is influenced.
On the other hand, the rising and falling changes of the water tank temperature cannot meet the actual hot water demand of a user, sometimes the user does not use the demand, the water tank temperature is very high, and energy is consumed in vain; sometimes, a user has a use demand, but the water temperature of the ton-level water tank is not increased to a target value at the moment, so that the user experience is influenced.
Aiming at the problem that the control of a multi-connected water heater is not intelligent enough in the related art, so that the user experience is poor, an effective solution is not provided at present.
Disclosure of Invention
The invention provides a multi-connected hot water machine control method and device and a multi-connected hot water machine, and at least solves the problem that in the prior art, the multi-connected hot water machine control is not intelligent enough, so that the user experience is poor.
In order to solve the above technical problem, according to an aspect of an embodiment of the present invention, there is provided a method for controlling a multi-hot water machine, the multi-hot water machine including: a plurality of user water tanks for providing hot water to users; the hot water tank is connected with the user water tank and used for preparing hot water and providing the hot water for the user water tank; the heating system comprises a plurality of heat pump outdoor units, a plurality of heat pump outdoor units and a plurality of heating units, wherein the heat pump outdoor units are connected with the hot water tank and are used for heating the hot water tank; the method comprises the following steps: determining a target temperature of a hot water tank when the hot water mode is operated; determining starting time intervals of a plurality of heat pump outdoor units according to the target temperature; and controlling the plurality of heat pump outdoor units to be started in sequence according to the starting time interval.
Further, determining a target temperature of the hot water tank includes: acquiring target temperatures of all user water tanks, and calculating average target water temperatures of the user water tanks; acquiring a first coefficient for representing the hot water demand of a user and a second coefficient for representing the water temperature demand of the user; wherein the larger the first coefficient, the more the user's hot water demand; the larger the second coefficient is, the higher the water temperature requirement of the user is; determining the target temperature of the hot water tank according to the average target water temperature of the user water tank, the first coefficient and the second coefficient; wherein the target temperature of the hot water tank is a product of an average target water temperature of the user water tank, a first coefficient and a second coefficient.
Further, obtaining a first coefficient characterizing a hot water demand of a user, comprises: acquiring the capacity of each user water tank, and calculating the total capacity of the user water tanks; the rated capacity of the hot water tank is obtained, and the ratio of the total capacity of the user water tank to the rated capacity of the hot water tank is calculated as a first coefficient.
Further, obtaining a second coefficient characterizing a water temperature demand of the user, comprises: acquiring real-time water temperatures of all user water tanks, determining the maximum value and the minimum value of the real-time water temperatures, and calculating the difference value between the maximum value and the minimum value of the real-time water temperatures as a first difference value; acquiring target water temperatures of all user water tanks, and calculating the temperature difference of all the user water tanks according to the target water temperatures and the real-time water temperatures; determining the maximum value and the minimum value of the temperature difference, and calculating the difference value between the maximum value and the minimum value of the temperature difference as a second difference value; and calculating the ratio of the first difference to the second difference as a second coefficient.
Further, determining the starting time intervals of the plurality of heat pump outdoor units according to the target temperature includes: acquiring initial starting time intervals of a plurality of heat pump outdoor units; determining a correction value of the initial startup time interval according to the target temperature; and correcting the initial startup time interval according to the correction value, and determining the startup time interval.
Further, determining a correction value for the initial boot interval based on the target temperature includes: detecting the real-time water temperature of the hot water tank; calculating a difference value between the average target water temperature and the real-time water temperature of the user water tank as a third difference value; calculating a difference value between the target temperature and the real-time water temperature as a fourth difference value; calculating a difference between the third difference and the fourth difference as a fifth difference; and acquiring the number of the user water tanks, and calculating the ratio of the fifth difference value to the number of the user water tanks to be used as a correction value.
Further, correcting the initial startup time interval according to the correction value, and determining the startup time interval, including: and calculating the product of the initial starting time interval and the correction value, and adding the product and the initial starting time interval to obtain the starting time interval.
Further, after controlling the plurality of heat pump outdoor units to be sequentially turned on according to the turn-on time interval, the method further includes: detecting rated heating time; and after the heat pump outdoor units are all started, if the rated heating time is not reached, controlling the heat pump outdoor units to all operate until the rated heating time.
Further, after the start-up time intervals of the plurality of heat pump outdoor units are determined according to the target temperature, the method further includes: acquiring a target output water volume of a hot water tank; detecting the current water quantity of the hot water tank; when the current water quantity is larger than the target output water quantity, controlling the hot water tank to discharge water until the water quantity of the hot water tank reaches the target output water quantity; and when the current water amount is less than the target output water amount, controlling the hot water tank to add water until the water amount of the hot water tank reaches the target output water amount.
Further, obtaining a target output water volume of the hot water tank comprises: calculating the output capacity Q1 of the heat pump outdoor units in the sequential starting stage; wherein Q1 ═ e × T0 ^2 × Q2/2, e is the number of heat pump outdoor units, T0 is the startup interval, Q2 is the single heating capacity of each heat pump outdoor unit; calculating the output capacity Q3 of all the operation stages of the heat pump outdoor units; q3 (Th-T0 e) Q4, Th being the rated heating time, and Q4 being the total heating capacity of the heat pump outdoor unit; detecting the real-time water temperature of the hot water tank, and calculating the difference value between the average target water temperature and the real-time water temperature of the user water tank; calculating the target output water amount by the following formula: (Q1+ Q3)/c/. DELTA.tu/ρ/L; wherein c is the specific heat capacity of water, Δ tu is the difference between the average target water temperature of the user water tank and the real-time water temperature, ρ is the density of water, and L is the rated capacity of the hot water tank.
According to another aspect of embodiments of the present invention, there is provided a control apparatus of a multi-hot water machine, the multi-hot water machine including: a plurality of user water tanks for providing hot water to users; the hot water tank is connected with the user water tank and used for preparing hot water and providing the hot water for the user water tank; the heating system comprises a plurality of heat pump outdoor units, a plurality of heat pump outdoor units and a plurality of heating units, wherein the heat pump outdoor units are connected with the hot water tank and are used for heating the hot water tank; the device comprises: the determining module is used for determining the target temperature of the hot water tank when the hot water making mode operates; the calculation module is used for determining the starting time intervals of the heat pump outdoor units according to the target temperature; and the control module is used for controlling the heat pump outdoor units to be started in sequence according to the starting time interval.
According to still another aspect of an embodiment of the present invention, there is provided a multiple hot water machine including the multiple hot water machine control device as described above.
According to still another aspect of embodiments of the present invention, there is provided a storage medium containing computer-executable instructions for performing the method of controlling an inline water heater as described above when executed by a computer processor.
In the invention, the hot water requirement of the integrated user group is calculated, the target temperature of the hot water tank is determined, and the plurality of heat pump outdoor units are subjected to group control according to the target temperature of the hot water tank, namely, the starting time interval is set, and the plurality of heat pump outdoor units are controlled to be started in sequence according to the starting time interval. In the scheme, the water tank can set a hot water target according to the requirements of users, so that the users can use hot water in time, an emergency hot water heating mode of a common water heater is omitted, high-energy-consumption accessories with low energy efficiency, such as electric heating, heat source backup and the like, are eliminated, and the comprehensive operation energy efficiency of the heating and ventilation system is improved. Meanwhile, an outer machine group operation strategy is designed according to customer requirements, operation time ratio is optimized, the problem of frequent starting and stopping of a compressor is solved, and the overall operation life of the outer machine group is prolonged. And the outer machine group, the hot water tank and the user group are designed into a whole from a joint control level, so that the integrated operation from user requirements to whole machine feedback is realized, and the comfort of the user and the energy conservation of the machine group are improved.
Drawings
Fig. 1 is an alternative configuration schematic diagram of a multi-hot water machine according to an embodiment of the present invention;
fig. 2 is an alternative flow chart of a multi-connected hot water machine control method according to an embodiment of the invention;
FIG. 3 is a flow chart of another alternative method for controlling a multi-connected hot water heater according to an embodiment of the invention; and
fig. 4 is an alternative block diagram of a multi-connected water heater control device according to an embodiment of the invention.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
Example 1
In a preferred embodiment 1 of the present invention, a control method of a multi-connected hot water machine is provided, which can be directly applied to a multi-connected hot water machine, and fig. 1 shows an optional structural schematic diagram of the multi-connected hot water machine of the present invention, as shown in fig. 1, 1 is a compressor of a heat pump outdoor unit, 2 is a four-way valve of a heat pump outdoor unit, 3 is a condenser of the heat pump outdoor unit, 4 is a throttle valve of the heat pump outdoor unit, 5 is an evaporator of the heat pump outdoor unit, 6 is a water pump, 7 is a hot water tank, 9 is an electromagnetic valve, 10 is a temperature sensing bag of the water tank, 11 is an outlet temperature sensing bag, 12 is a return temperature sensing bag, 17 is a water coil, F1, F2, F3 · · Fn is a user group, and includes a plurality of user water tanks.
Based on the multi-split hot water machine, fig. 2 shows an alternative flowchart of a control method of the multi-split hot water machine, as shown in fig. 2, the method includes the following steps S202 to S206:
s202: determining a target temperature of a hot water tank when the hot water mode is operated;
s204: determining starting time intervals of a plurality of heat pump outdoor units according to the target temperature;
s206: and controlling the plurality of heat pump outdoor units to be started in sequence according to the starting time interval.
In the above embodiment, the hot water demand of the integrated user group is calculated, the target temperature of the hot water tank is determined, and the plurality of heat pump outdoor units are group-controlled according to the target temperature of the hot water tank, that is, the startup time interval is set, and the plurality of heat pump outdoor units are controlled to be sequentially started up according to the startup time interval. In the scheme, the water tank can set a hot water target according to the requirements of users, so that the users can use hot water in time, an emergency hot water heating mode of a common water heater is omitted, high-energy-consumption accessories with low energy efficiency, such as electric heating, heat source backup and the like, are eliminated, and the comprehensive operation energy efficiency of the heating and ventilation system is improved. Meanwhile, an outer machine group operation strategy is designed according to customer requirements, operation time ratio is optimized, the problem of frequent starting and stopping of a compressor is solved, and the overall operation life of the outer machine group is prolonged. And the outer machine group, the hot water tank and the user group are designed into a whole from a joint control level, so that the integrated operation from user requirements to whole machine feedback is realized, and the comfort of the user and the energy conservation of the machine group are improved.
In a preferred embodiment of the present invention, determining a target temperature of a hot water tank comprises: acquiring target temperatures of all user water tanks, and calculating average target water temperatures of the user water tanks; acquiring a first coefficient for representing the hot water demand of a user and a second coefficient for representing the water temperature demand of the user; wherein the larger the first coefficient, the more the user's hot water demand; the larger the second coefficient is, the higher the water temperature requirement of the user is; determining the target temperature of the hot water tank according to the average target water temperature of the user water tank, the first coefficient and the second coefficient; wherein the target temperature of the hot water tank is a product of an average target water temperature of the user water tank, a first coefficient and a second coefficient.
Specifically, obtaining a first coefficient for characterizing a user's hot water demand includes: acquiring the capacity of each user water tank, and calculating the total capacity of the user water tanks; the rated capacity of the hot water tank is obtained, and the ratio of the total capacity of the user water tank to the rated capacity of the hot water tank is calculated as a first coefficient.
Further, obtaining a second coefficient characterizing a user water temperature demand includes: acquiring real-time water temperatures of all user water tanks, determining the maximum value and the minimum value of the real-time water temperatures, and calculating the difference value between the maximum value and the minimum value of the real-time water temperatures as a first difference value; acquiring target water temperatures of all user water tanks, and calculating the temperature difference of all the user water tanks according to the target water temperatures and the real-time water temperatures; determining the maximum value and the minimum value of the temperature difference, and calculating the difference value between the maximum value and the minimum value of the temperature difference as a second difference value; and calculating the ratio of the first difference to the second difference as a second coefficient.
Specifically, it can be calculated as follows:
the capacities of the user group water tanks are m1, m2 and m 3. mn; the unit of water capacity is L;
setting the maximum capacity of a ton-level water tank as L and the actual water capacity as p;
the initial tank target temperature Tt is calculated as follows:
the capacity coefficient alpha of the water tank is (m1+ m2+ m3+ · + mn)/L;
user group real-time tank temperatures to1, to2, to3, · · ton;
the temperature differences delta t1, delta t2, delta t3 & cndot & ltdelta tn & gt of the water tanks of the user group; the temperature difference is the target temperature-the actual temperature;
the maximum temperature difference delta tmax and the minimum temperature difference delta tmin correspond to the water tank temperature tomax and tomin;
the average target water temperature Tt1 ((. DELTA.t 1+ to1) + (. DELTA.t 2+ to2) + (. DELTA.tn + ton))/n is calculated
The calculation formula is as follows:
when the second coefficient is increased, the user demand is increased, alpha is the total water tank demand of the user, and the increase of alpha indicates the increase of the water quantity demand of the user; when the user demand increases, the target water temperature increases.
After the target temperature is determined, the method for determining the starting time intervals of the heat pump outdoor units according to the target temperature comprises the following steps: acquiring initial starting time intervals of a plurality of heat pump outdoor units; determining a correction value of the initial startup time interval according to the target temperature; and correcting the initial startup time interval according to the correction value, and determining the startup time interval.
Determining a correction value for an initial boot time interval based on a target temperature, comprising: detecting the real-time water temperature of the hot water tank; calculating a difference value between the average target water temperature and the real-time water temperature of the user water tank as a third difference value; calculating a difference value between the target temperature and the real-time water temperature as a fourth difference value; calculating a difference between the third difference and the fourth difference as a fifth difference; and acquiring the number of the user water tanks, and calculating the ratio of the fifth difference value to the number of the user water tanks to be used as a correction value.
Correcting the initial startup time interval according to the correction value, and determining the startup time interval, wherein the steps comprise: and calculating the product of the initial starting time interval and the correction value, and adding the product and the initial starting time interval to obtain the starting time interval.
Specifically, detecting the real-time temperature Tu of a tonnage water tank;
calculating a control temperature difference (third difference) Δ Tu being Tt-Tu, and a primary temperature difference (fourth difference) Δ Tu1 being Tt 1-Tu;
the initial starting interval of the outer machine groups is T0, and the number of the outer machine groups is e;
the startup interval correction Δ T is calculated as follows:
Δ T is T0 ([ delta ] tu1- [ delta ] tu)/e, and the turn-on interval is corrected to Δ T + T0.
Delta tu 1-delta tu is a target temperature difference variation amount, which can show the change of the customer demand, when the demand is negative, the demand of the user is shrunk, and when the demand is positive, the demand of the user is increased; dividing it by the number of units e is the correction factor for the startup interval.
After controlling the plurality of heat pump outdoor units to start up in sequence according to the start-up time interval, the method further comprises the following steps: detecting rated heating time; and after the heat pump outdoor units are all started, if the rated heating time is not reached, controlling the heat pump outdoor units to all operate until the rated heating time.
After the startup time intervals of the heat pump outdoor units are determined according to the target temperature, the method further comprises the following steps: acquiring a target output water volume of a hot water tank; detecting the current water quantity of the hot water tank; when the current water quantity is larger than the target output water quantity, controlling the hot water tank to discharge water until the water quantity of the hot water tank reaches the target output water quantity; and when the current water amount is less than the target output water amount, controlling the hot water tank to add water until the water amount of the hot water tank reaches the target output water amount.
Wherein, obtain the target output water yield of hot water tank, include: calculating the output capacity Q1 of the heat pump outdoor units in the sequential starting stage; wherein Q1 ═ e × T0 ^2 × Q2/2, e is the number of heat pump outdoor units, T0 is the startup interval, Q2 is the single heating capacity of each heat pump outdoor unit; calculating the output capacity Q3 of all the operation stages of the heat pump outdoor units; q3 ═ Th-T0 ·) Q4, Th is the rated heating time, and Q4 is the total heating capacity of the heat pump outdoor unit; detecting the real-time water temperature of the hot water tank, and calculating the difference value between the average target water temperature and the real-time water temperature of the user water tank; calculating the target output water amount by the following formula: (Q1+ Q3)/c/. DELTA.tu/ρ/L; wherein c is the specific heat capacity of water, Δ tu is the difference between the average target water temperature of the user water tank and the real-time water temperature, ρ is the density of water, and L is the rated capacity of the hot water tank.
The specific water tank capacity adjustment strategy is as follows:
the outdoor units are sequentially opened for Tp (T0 × e), the output capacity of all the heat pump outdoor units in operation is Q4, and the single-machine capacity is Q2;
setting the rated heating time as Th;
the required water capacity PP is calculated as follows:
the output capacity Q1 of the sequentially opened segment of the outer cluster is calculated as follows
Further derived as Q1 ═ (e × T0) ^2 × Q2/2;
the full load output capacity time, that is, the time of all the operation stages of the plurality of heat pump outdoor units is Th-T0 × e;
then PP ═ Q1+ (Th-T0 × e) × Q4)/c/[ delta ] tu/ρ/L;
the water tank capacity adjustment quantity delta P is equal to PP-P;
when the delta P is positive, water is added into the ton-level water tank, and otherwise, water is discharged.
In preferred embodiment 1 of the present invention, another method for controlling a multi-hot water machine is further provided, and specifically, fig. 3 shows an alternative flowchart of the method, and as shown in fig. 3, the method includes the following steps S302-S312:
s302, starting up the unit to run;
s304, detecting data such as temperature difference, water capacity and the like of the water tank;
s306, calculating a water tank target through a preliminary correlation;
s308, recalculating the requirement of the external unit according to the target value of the water tank and providing the start-stop law coefficient of the external unit;
s310, adjusting the start-stop rule of the external unit and adjusting the water capacity of the water tank;
and S312, continuing to operate.
In the above embodiment, the hot water demand of the integrated user group is calculated, the target temperature of the hot water tank is determined, and the plurality of heat pump outdoor units are group-controlled according to the target temperature of the hot water tank, that is, the startup time interval is set, and the plurality of heat pump outdoor units are controlled to be sequentially started up according to the startup time interval. In the scheme, the water tank can set a hot water target according to the requirements of users, so that the users can use hot water in time, an emergency hot water heating mode of a common water heater is omitted, high-energy-consumption accessories with low energy efficiency, such as electric heating, heat source backup and the like, are eliminated, and the comprehensive operation energy efficiency of the heating and ventilation system is improved. Meanwhile, an outer machine group operation strategy is designed according to customer requirements, operation time ratio is optimized, the problem of frequent starting and stopping of a compressor is solved, and the overall operation life of the outer machine group is prolonged. And the outer machine group, the hot water tank and the user group are designed into a whole from a joint control level, so that the integrated operation from user requirements to whole machine feedback is realized, and the comfort of the user and the energy conservation of the machine group are improved.
Example 2
Based on the method for controlling the multiple hot water machine provided in the foregoing embodiment 1, in a preferred embodiment 2 of the present invention, there is further provided a device for controlling a multiple hot water machine, and specifically, fig. 4 shows an alternative structural block diagram of the device, as shown in fig. 4, the device includes:
a determining module 402, configured to determine a target temperature of the hot water tank when the hot water heating mode is in operation;
a calculating module 404, connected to the determining module 402, for determining the startup time intervals of the heat pump outdoor units according to the target temperature;
and the control module 406 is connected to the calculation module 404, and is configured to control the heat pump outdoor units to start up sequentially according to the start-up time interval.
In the above embodiment, the hot water demand of the integrated user group is calculated, the target temperature of the hot water tank is determined, and the plurality of heat pump outdoor units are group-controlled according to the target temperature of the hot water tank, that is, the startup time interval is set, and the plurality of heat pump outdoor units are controlled to be sequentially started up according to the startup time interval. In the scheme, the water tank can set a hot water target according to the requirements of users, so that the users can use hot water in time, an emergency hot water heating mode of a common water heater is omitted, high-energy-consumption accessories with low energy efficiency, such as electric heating, heat source backup and the like, are eliminated, and the comprehensive operation energy efficiency of the heating and ventilation system is improved. Meanwhile, an outer machine group operation strategy is designed according to customer requirements, operation time ratio is optimized, the problem of frequent starting and stopping of a compressor is solved, and the overall operation life of the outer machine group is prolonged. And the outer machine group, the hot water tank and the user group are designed into a whole from a joint control level, so that the integrated operation from user requirements to whole machine feedback is realized, and the comfort of the user and the energy conservation of the machine group are improved.
With regard to the apparatus in the above embodiments, the specific manner in which each unit and each module performs operations has been described in detail in the embodiments related to the method, and will not be described in detail herein.
Example 3
Based on the control device of the multiple hot water machine provided in the above embodiment 2, in a preferred embodiment 3 of the present invention, there is also provided a multiple hot water machine including the control device of the multiple hot water machine as described above.
In the above embodiment, the hot water demand of the integrated user group is calculated, the target temperature of the hot water tank is determined, and the plurality of heat pump outdoor units are group-controlled according to the target temperature of the hot water tank, that is, the startup time interval is set, and the plurality of heat pump outdoor units are controlled to be sequentially started up according to the startup time interval. In the scheme, the water tank can set a hot water target according to the requirements of users, so that the users can use hot water in time, an emergency hot water heating mode of a common water heater is omitted, high-energy-consumption accessories with low energy efficiency, such as electric heating, heat source backup and the like, are eliminated, and the comprehensive operation energy efficiency of the heating and ventilation system is improved. Meanwhile, an outer machine group operation strategy is designed according to customer requirements, operation time ratio is optimized, the problem of frequent starting and stopping of a compressor is solved, and the overall operation life of the outer machine group is prolonged. And the outer machine group, the hot water tank and the user group are designed into a whole from a joint control level, so that the integrated operation from user requirements to whole machine feedback is realized, and the comfort of the user and the energy conservation of the machine group are improved.
Example 4
Based on the multi-hot water machine control method provided in the above embodiment 1, there is also provided in a preferred embodiment 4 of the present invention a storage medium containing computer-executable instructions for executing the multi-hot water machine control method as described above when executed by a computer processor.
In the above embodiment, the hot water demand of the integrated user group is calculated, the target temperature of the hot water tank is determined, and the plurality of heat pump outdoor units are group-controlled according to the target temperature of the hot water tank, that is, the startup time interval is set, and the plurality of heat pump outdoor units are controlled to be sequentially started up according to the startup time interval. In the scheme, the water tank can set a hot water target according to the requirements of users, so that the users can use hot water in time, an emergency hot water heating mode of a common water heater is omitted, high-energy-consumption accessories with low energy efficiency, such as electric heating, heat source backup and the like, are eliminated, and the comprehensive operation energy efficiency of the heating and ventilation system is improved. Meanwhile, an outer machine group operation strategy is designed according to customer requirements, operation time ratio is optimized, the problem of frequent starting and stopping of a compressor is solved, and the overall operation life of the outer machine group is prolonged. And the outer machine group, the hot water tank and the user group are designed into a whole from a joint control level, so that the integrated operation from user requirements to whole machine feedback is realized, and the comfort of the user and the energy conservation of the machine group are improved.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (13)
1. A control method of a multi-split water heater is characterized in that the multi-split water heater comprises the following steps: a plurality of user water tanks for providing hot water to users; the hot water tank is connected with the user water tank and used for preparing hot water and providing the hot water for the user water tank; the heating system comprises a plurality of heat pump outdoor units, is connected with the hot water tank and is used for heating the hot water tank; the method comprises the following steps:
determining a target temperature of the hot water tank when operating in a hot water mode;
determining the starting time intervals of the heat pump outdoor units according to the target temperature;
and controlling the plurality of heat pump outdoor units to be started in sequence according to the starting time interval.
2. The method of claim 1, wherein said determining a target temperature of said hot water tank comprises:
acquiring target temperature of each user water tank, and calculating average target water temperature of the user water tanks;
acquiring a first coefficient for representing the hot water demand of a user and a second coefficient for representing the water temperature demand of the user; wherein the larger the first coefficient, the more the user's hot water demand; the larger the second coefficient is, the higher the water temperature demand of the user is;
determining a target temperature of the hot water tank according to the average target water temperature of the user water tank, the first coefficient and the second coefficient; wherein the target temperature of the hot water tank is a product of an average target water temperature of the user water tank, the first coefficient, and the second coefficient.
3. The method of claim 2, wherein obtaining a first coefficient characterizing a user's hot water demand comprises:
acquiring the capacity of each user water tank, and calculating the total capacity of the user water tanks;
and acquiring the rated capacity of the hot water tank, and calculating the ratio of the total capacity of the user water tank to the rated capacity of the hot water tank as the first coefficient.
4. The method of claim 2, wherein said obtaining a second coefficient characterizing a user water temperature demand comprises:
acquiring real-time water temperatures of the user water tanks, determining the maximum value and the minimum value of the real-time water temperatures, and calculating a difference value between the maximum value and the minimum value of the real-time water temperatures to serve as a first difference value;
acquiring target water temperatures of the user water tanks, and calculating temperature differences of the user water tanks according to the target water temperatures and the real-time water temperatures;
determining the maximum value and the minimum value of the temperature difference, and calculating the difference value between the maximum value and the minimum value of the temperature difference as a second difference value;
calculating a ratio of the first difference to the second difference as the second coefficient.
5. The method of claim 2, wherein the determining the turn-on time intervals of the plurality of heat pump outdoor units according to the target temperature comprises:
acquiring initial starting time intervals of the plurality of heat pump outdoor units;
determining a correction value of the initial starting-up time interval according to the target temperature;
and correcting the initial starting-up time interval according to the correction value, and determining the starting-up time interval.
6. The method of claim 5, wherein said determining a correction value for said initial turn-on interval based on said target temperature comprises:
detecting the real-time water temperature of the hot water tank;
calculating a difference value between the average target water temperature of the user water tank and the real-time water temperature as a third difference value;
calculating a difference value between the target temperature and the real-time water temperature as a fourth difference value;
calculating a difference between the third difference and the fourth difference as a fifth difference;
and acquiring the number of the user water tanks, and calculating the ratio of the fifth difference value to the number of the user water tanks to be used as the correction value.
7. The method of claim 5, wherein said modifying said initial turn-on interval according to said modified value, and determining said turn-on interval comprises:
and calculating the product of the initial starting-up time interval and the correction value, and adding the product and the initial starting-up time interval to obtain the starting-up time interval.
8. The method of claim 1, wherein after controlling the plurality of heat pump outdoor units to be sequentially turned on according to the turn-on time interval, the method further comprises:
detecting rated heating time;
and after the heat pump outdoor units are all started, if the rated heating time is not reached, controlling the heat pump outdoor units to all operate until the rated heating time.
9. The method of claim 8, further comprising, after determining the turn-on time intervals of the plurality of heat pump outdoor units according to the target temperature:
acquiring a target output water volume of the hot water tank;
detecting the current water quantity of the hot water tank;
when the current water amount is larger than the target output water amount, controlling the hot water tank to discharge water until the water amount of the hot water tank reaches the target output water amount;
and when the current water amount is smaller than the target output water amount, controlling the hot water tank to add water until the water amount of the hot water tank reaches the target output water amount.
10. The method of claim 9, wherein said obtaining a target output water volume of said hot water tank comprises:
calculating the output capacity Q1 of the heat pump outdoor units in the sequential starting-up stage; wherein Q1 ═ e × T0 ^2 × Q2/2, e is the number of the heat pump outdoor units, T0 is the on-time interval, and Q2 is the single heating capacity of each heat pump outdoor unit;
calculating the output capacity Q3 of all the operation stages of the heat pump outdoor units; wherein Q3 (Th-T0 e) Q4, Th is the rated heating time, and Q4 is the total heating capacity of the heat pump outdoor unit;
detecting the real-time water temperature of the hot water tank, and calculating the difference value between the average target water temperature of the user water tank and the real-time water temperature;
calculating the target output water amount by the following formula: (Q1+ Q3)/c/. DELTA.tu/ρ/L; wherein c is the specific heat capacity of water, Δ tu is the difference between the average target water temperature of the user water tank and the real-time water temperature, ρ is the density of water, and L is the rated capacity of the hot water tank.
11. A control device of a multi-connected water heater is characterized in that the multi-connected water heater comprises: a plurality of user water tanks for providing hot water to users; the hot water tank is connected with the user water tank and used for preparing hot water and providing the hot water for the user water tank; the heating system comprises a plurality of heat pump outdoor units, is connected with the hot water tank and is used for heating the hot water tank; the device comprises:
the determining module is used for determining the target temperature of the hot water tank when the hot water heating mode operates;
the calculation module is used for determining the starting time intervals of the heat pump outdoor units according to the target temperature;
and the control module is used for controlling the plurality of heat pump outdoor units to be started in sequence according to the starting time interval.
12. A multiple hot water machine characterized by comprising the multiple hot water machine control device as claimed in claim 11.
13. A storage medium containing computer-executable instructions for performing the multi-hot water machine control method according to any one of claims 1 to 10 when executed by a computer processor.
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