CN117490133B - Heating control method and multi-energy complementary heating system - Google Patents
Heating control method and multi-energy complementary heating system Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D11/00—Central heating systems using heat accumulated in storage masses
- F24D11/02—Central heating systems using heat accumulated in storage masses using heat pumps
- F24D11/0214—Central heating systems using heat accumulated in storage masses using heat pumps water heating system
- F24D11/0221—Central heating systems using heat accumulated in storage masses using heat pumps water heating system combined with solar energy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1045—Arrangement or mounting of control or safety devices for water heating systems for central heating the system uses a heat pump and solar energy
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Abstract
The application provides a heating control method and a multifunctional complementary heating system, and belongs to the technical field of clean energy heating. According to the heating control method, first operation control information is generated according to a preset time interval, an objective function taking predicted power consumption as a function value is established according to a system parameter set of a multi-energy complementary heating system, constraint conditions of the objective function are established, a unit operation control table which does not meet the constraint conditions in the first operation control information is removed, a second operation control table is formed, the minimum value of the objective function value is obtained through an optimizing algorithm, and the corresponding unit operation control table is obtained to serve as an operation control table of the multi-energy complementary heating system; the heating control method can effectively reduce the running cost of the heating system and improve the performance coefficient and the energy utilization rate while ensuring the reliability and the comfort level of heating. The multi-energy complementary heating system adopts the heating control method to heat users.
Description
Technical Field
The application relates to the technical field of clean energy heating, in particular to a heating control method and a multi-energy complementary heating system.
Background
In most northern areas of China, the outdoor temperature is low in winter, the heating time is long, especially in most northwest areas, the requirements of people on indoor heating in winter are increasingly greater due to the severe cold and cold climate areas, and along with the development of economy and scientific technology, the requirements of people on indoor heating are also continuously improved. Because of the abundant solar energy resources in most areas in the north, outdoor temperature is low in winter, and heating is usually carried out by adopting a mode of complementation of multiple energy sources such as solar energy, air energy, electric energy and the like.
For a multi-energy complementary heating system, how to improve the comprehensive utilization rate of energy is always a difficulty of the multi-energy complementary heating technology, wherein the operation control of the heating system is an important factor affecting the comprehensive utilization rate of energy. Because of uncertainty of solar energy and lower operation efficiency of air energy heat pump heating in low temperature environment, maximum utilization of energy is difficult to realize through simple time control, energy waste is caused, and instability of operation of a heating system is increased.
Disclosure of Invention
The invention aims to provide a heating control method and a multi-energy complementary heating system, so as to improve the utilization rate of energy sources and reduce the energy consumption of the heating system.
To achieve the above and other related objects, the present application provides a heating control method, including the steps of:
generating first operation control information of the multi-energy complementary heating system according to a preset time interval delta t, wherein the first operation control information comprises a plurality of unit operation control tables;
acquiring weather forecast information;
constructing an objective function according to a system parameter set of the multi-energy complementary heating system, and predicting the power consumption W C Taking a value as an objective function;
constructing constraint conditions of the objective function according to the weather prediction information and the system parameter set;
rejecting a unit operation control table which does not meet the constraint condition in the first operation control information to form second operation control information;
according to the second operation control information, calculating to obtain the target function value W C The minimum value of the multi-energy complementary heating system is obtained, and a corresponding unit operation control table is obtained as an operation control table of the multi-energy complementary heating system;
and controlling the multi-energy complementary heating system to work according to the operation control table.
Optionally, the weather prediction information includes indoor temperature distribution information, outdoor temperature distribution information, and illumination radiation intensity information.
Optionally, constructing an objective function according to the system parameter set of the multi-energy complementary heating system, including the following steps:
acquiring the operation parameters of a circulating pump unit, the operation parameters of a compressor and the operation parameters of an air-cooled evaporator;
according to the cycleThe operation parameters of the pump unit are calculated to obtain the power consumption W of the circulating pump unit 1 ；
According to the operation parameters of the compressor, the power consumption W of the compressor is calculated 2 ；
Determining the power of the air-cooled evaporator of the multi-energy complementary heating system according to the weather prediction information and the operation parameters of the air-cooled evaporator to calculate and obtain the power consumption W of the air-cooled evaporator 3 ；
Constructing the objective function: w (W) C =W 1 +W 2 +W 3 。
Optionally, the power consumption W of the circulating pump unit 1 Comprises the power consumption W of a solar circulating pump 11 Power consumption W of water tank circulating pump 12 And the power consumption W of the hot water circulating pump 13 。
Optionally, the constraints include a first constraint, a second constraint, and a third constraint.
Optionally, the first constraint condition is a thermal balance constraint condition, and the constructing the first constraint condition of the objective function includes the following steps:
according to the weather forecast information, calculating to obtain a forecast heat load Q C And the heat storage quantity Q of the water tank S The predicted thermal load Q C For the user to predict the required heat, the water tank stores heat Q S Heating the solar heat collecting plate of the multi-energy complementary heating system;
according to the system parameter set, calculating to obtain auxiliary heating quantity Q AW ；
Constructing the first constraint condition: q (Q) C =Q S +Q AW 。
Optionally, the auxiliary heating quantity Q AW Including air source heat pump heating quantity Q A And heating quantity Q of water source heat pump W 。
Optionally, the second constraint condition is a mass balance constraint condition, and the constructing the second constraint condition of the objective function includes the following steps:
acquiring a first water outlet of a heat storage water tank of the multi-energy complementary heating systemFlow F so First water inlet flow F si Second water outlet flow F ho And a second water inlet flow F hi ；
Acquiring the volume change dV of the first working medium in the heat storage water tank in the time interval dt tank ；
Constructing the second constraint condition: dV (dV) tank =（F si +F hi -F so -F ho ）dt。
Optionally, the third constraint is a temperature constraint, and the expression of the third constraint is: t (T) min ≤T tank ≤T max The method comprises the steps of carrying out a first treatment on the surface of the Wherein T is min The temperature lower limit of the first working medium in the heat storage water tank of the multi-energy complementary heating system is T tank T is the temperature of the first working medium in the heat storage water tank max And the upper temperature limit of the first working medium in the heat storage water tank is set.
The present application also provides a multi-energy complementary heating system for executing any one of the heating control methods of the foregoing embodiments, including:
the solar heat collecting module comprises a solar heat collecting plate, a heat collecting water inlet and a heat collecting water outlet;
the circulating pump unit comprises a solar circulating pump, a water tank circulating pump and a hot water circulating pump;
the heat storage water tank is provided with a first water inlet, a first water outlet, a second water inlet and a second water outlet, the first water inlet is communicated with the heat collection water outlet, and the first water outlet is communicated with the heat collection water inlet through the solar circulating pump;
the auxiliary heating module is provided with an auxiliary heating first water inlet, an auxiliary heating first water outlet, an auxiliary heating second water inlet and an auxiliary heating second water outlet, the auxiliary heating first water inlet is communicated with the second water outlet through the water tank circulating pump, and the auxiliary heating first water outlet is communicated with the second water inlet;
the user side heating module is provided with a tail end first water inlet communicated with the second water outlet, a tail end first water outlet communicated with the second water inlet, a tail end second water inlet communicated with the auxiliary heating second water outlet and a tail end second water outlet communicated with the auxiliary heating second water inlet, and the hot water circulating pump is arranged in the user side heating module so as to provide power for a second working medium flowing in the user side heating module;
the control cabinet is in communication connection with the solar heat collection module, the auxiliary heating module, the heat storage water tank, the user side heating module and the circulating pump unit.
The heating control method and the multifunctional complementary heating system have the following beneficial effects:
according to the heating control method, first operation control information is generated according to a preset time interval delta t, an objective function taking predicted power consumption as a function value is established through the acquired weather prediction information and a system parameter set of a multi-energy complementary heating system, constraint conditions of the objective function are determined, a unit operation control table which does not meet the constraint conditions in the first operation control information is removed, second operation control information is generated, the minimum value of the objective function is acquired according to the second operation control information, and the corresponding unit operation control table is used as an operation control table to control the operation of the multi-energy complementary heating system; the heating control method can effectively reduce the power consumption of the multi-energy complementary heating system by optimizing the operation time of the circulating pump unit while meeting the heating reliability and the comfort, improves the heating efficiency and the energy utilization rate of the multi-energy complementary heating system, and adjusts working conditions once every deltat according to weather forecast information to generate future operation control information, thereby effectively improving the operation stability of the heating system. The multi-energy complementary heating system of the present application performs heating by any one of the heating control methods described in the foregoing embodiments, and therefore has the same advantageous effects as described above.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a heating control method according to an embodiment of the present application.
Fig. 2 is a schematic flow chart of constructing a first constraint according to an embodiment of the present application.
Fig. 3 is a schematic flow chart of calculating the minimum value of the objective function according to the first embodiment of the present application.
Fig. 4 is a schematic structural diagram of a multi-energy complementary heating system according to a second embodiment of the present disclosure.
Fig. 5 is a detailed flow chart of a multi-energy complementary heating system according to the second embodiment of the present application.
The reference numerals indicate:
11. a solar heat collection module; 111. a solar heat collecting plate; 112. a heat collecting water inlet; 113. a heat collection water outlet; 114. an irradiation instrument; 101. a first control valve; 102. a second control valve; 103. a temperature sensor; 104. a flow sensor; 12. a thermal storage tank; 121. a first water inlet; 122. a first water outlet; 123. a second water inlet; 124. a second water outlet; 13. an auxiliary heating module; 131. an air-cooled evaporator; 132. a water-cooled evaporator; 133. a compressor; 134. a three-way valve; 135. a throttle valve; 136. a second heat exchanger; 1301. auxiliary heating first water inlet; 1302. a first auxiliary heating water outlet; 1303. a secondary heating second water inlet; 1304. a secondary heating second water outlet; 14. a user side heating module; 141. a terminal heating device; 142. a first heat exchanger; 1401. a terminal first water inlet; 1402. a first water outlet at the tail end; 1403. a second water inlet at the tail end; 1404. a second water outlet at the tail end; 15. a circulating pump unit; 151. a solar energy circulating pump; 152. a water tank circulation pump; 153. a hot water circulation pump; 16. and a control cabinet.
Detailed Description
To make the technical objects, technical solutions and technical effects of the present application more apparent, the technical solutions in the present application will be clearly and completely described below with reference to embodiments, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present application, it should be noted that, descriptions of terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Example 1
The embodiment provides a heating control method which is suitable for a multi-energy complementary heating system, so that the energy utilization rate of the multi-energy complementary heating system is improved, and the energy consumption of the multi-energy complementary heating system is reduced. Referring to fig. 1, the heating control method provided in the present embodiment includes steps S11 to S17.
Step S11: generating first operation control information;
generating first operation control information of the multi-energy complementary heating system according to a preset time interval delta t; the first operation control information comprises a plurality of unit operation control tables, the preset time interval delta t is a scheduling period of the multi-energy complementary heating system, the scheduling period is the minimum continuous working time of the multi-energy complementary heating system in the same working mode, and when one scheduling period is finished, the multi-energy complementary heating system can adjust the working mode or continue the former working mode.
In this embodiment, the first operation control information is operation information of the multi-energy complementary heating system, where each unit operation control table corresponds to one operation condition of the multi-energy complementary heating system in the future 1 day, and the first operation control information includes all possible operation conditions of the multi-energy complementary heating system in the future 1 day; the number of operating conditions that may occur with the multi-energy complementary heating system is reduced when the preset time interval Δt is increased, and the number of operating conditions that may occur with the multi-energy complementary heating system is increased when the preset time interval Δt is reduced.
In an alternative embodiment, the preset time interval Δt is set to 0.5h, that is, the time of day includes 48 time intervals Δt, the multi-energy complementary heating system continuously works for 0.5h at least in the same working mode, and when the next preset time interval Δt arrives, the multi-energy complementary heating system can continue the former working mode or change other working modes.
Step S12: acquiring weather forecast information;
the weather forecast information is weather information of a time period in the future, and comprises temperature distribution information and illumination radiation intensity information.
In this embodiment, the temperature distribution information includes indoor temperature distribution information and outdoor temperature distribution information, where the indoor temperature distribution information is indoor temperature distribution information of a user side, and according to a requirement of the user on indoor temperature, the indoor temperature distribution information is obtained; the outdoor temperature distribution information is environment temperature distribution information of the location of the multi-energy complementary heating system, the outdoor temperature distribution information comprises a plurality of pieces of outdoor temperature information, and each piece of outdoor temperature information comprises outdoor temperature t within a preset time interval delta t w The method comprises the steps of carrying out a first treatment on the surface of the The illumination radiation intensity information is solar radiation intensity information of a location of the multi-energy complementary heating system and comprises a plurality of solar irradiance information, and each solar irradiance information comprises solar irradiance I within a preset time interval delta t t The method comprises the steps of carrying out a first treatment on the surface of the Alternatively, canTo obtain local ambient temperature distribution information and illumination radiation intensity information by broadcasting, the internet, or other acceptable means.
In an alternative embodiment, the indoor temperature t of the user n To be constant temperature, optionally, the indoor temperature t n The outdoor temperature distribution information and the irradiation intensity information are shown in table 1 at 18 ℃. It should be noted that the data shown in table 1 are only data given by way of example in a specific period of time, a specific place and a specific weather in the present embodiment, and are not limitations of the present application, and the preset time interval Δt and the indoor temperature t in the present embodiment n Outdoor temperature t w Solar irradiance I t And the weather conditions can be adjusted to other values according to actual needs and actual environment.
Table 1 outdoor temperature distribution information and illumination radiation intensity information for time of day
Step S13: constructing an objective function;
constructing an objective function according to a system parameter set of the multi-energy complementary heating system, and predicting the power consumption W C Take value as an objective function.
In this embodiment, the system parameter set of the multi-energy complementary heating system includes a circulation pump unit operation parameter, a compressor operation parameter, and an air-cooled evaporator operation parameter. According to the operation parameters of the circulating pump unit, the power P of the circulating pump unit is obtained 1 Power P of circulating pump unit 1 Comprising solar energy circulating pump power P 11 Power P of water tank circulation pump 12 Power P of hot water circulating pump 13 And calculating to obtain the power consumption W of the circulating pump unit 1 Power consumption W of circulating pump unit 1 Comprises the power consumption W of a solar circulating pump 11 Power consumption W of water tank circulating pump 12 Power consumption W of hot water circulating pump 13 The method comprises the steps of carrying out a first treatment on the surface of the Obtaining compressor power P according to the compressor power parameter 2 And compressor efficiency eta w And calculate the power consumption W of the compressor 2 The method comprises the steps of carrying out a first treatment on the surface of the From the following componentsThe operation of the air-cooled evaporator is greatly influenced by environmental factors, so that the corresponding power P of the air-cooled evaporator at different outdoor temperatures is determined according to the operation parameters of the air-cooled evaporator and the outdoor temperature distribution information 3 And calculate the power W of the air-cooled evaporator 3 The method comprises the steps of carrying out a first treatment on the surface of the Constructing an objective function: w (W) C =W 1 +W 2 +W 3 ，W C The predicted power consumption for a multi-energy complementary heating system.
In an alternative embodiment, the number of preset time intervals Δt included in the time of day is recorded as N, n=24/Δt, N being a positive integer; the power consumption W of the circulating pump unit 1 The expression of (2) is:due to P 1 = P 11 + P 12 + P 13 Power consumption W of circulating pump unit 1 It can also be expressed as:the method comprises the steps of carrying out a first treatment on the surface of the Compressor power consumption W 2 Can be expressed as:the method comprises the steps of carrying out a first treatment on the surface of the Power consumption W of air-cooled evaporator 3 Can be expressed as:. Alternatively, when Δt takes a value of 0.5 and N takes a value of 48, the objective function is:。
wherein i is the serial number of the preset time interval deltat,、andrespectively representing the corresponding power of the circulating pump unit, the power of the compressor and the air-cooled evaporator in the ith preset time interval delta tPower.
Step S14: constructing constraint conditions of the objective function;
and establishing constraint conditions of the objective function according to the acquired weather preset information and a system parameter set of the multi-energy complementary heating system. By establishing constraint conditions, the operation working conditions of the multi-energy complementary heating system which obviously do not meet the actual or cannot meet the requirements can be removed, so that the operation amount is reduced, and the operation efficiency is improved.
In this embodiment, the constraint conditions include a first constraint condition, a second constraint condition and a third constraint condition, where the first constraint condition is a thermal balance constraint condition, and is used to reflect a thermal balance state in the multi-energy complementary heating system, the second constraint condition is a mass balance constraint condition, and is used to reflect a mass balance state of the first working medium in the heat storage tank, and the third constraint condition is a temperature constraint condition, and is used to constrain a temperature of the first working medium in the heat storage tank.
In an alternative embodiment, the first constraint is a thermal equilibrium constraint, expressed as:wherein Q is C To predict the thermal load, the thermal load Q is predicted C For the user to predict the heat demand, Q S To store heat in the water tank, the water tank stores heat Q S Heating quantity Q of solar heat collecting plate of multi-energy complementary heating system AW To assist heating quantity Q AW To assist the heating quantity of the heating module. Referring to fig. 2, a first constraint of an objective function is constructed, including steps S141 to S143.
Step S141: calculating a predicted heat load and a water tank heat storage capacity;
because the predicted demand heat of the user is mainly influenced by the ambient temperature and the heating amount of the solar heat collecting plate is mainly influenced by illumination, the predicted heat load Q is calculated based on the acquired weather prediction information C And the heat storage quantity Q of the water tank S Specifically, calculating the predicted heat load and the tank heat accumulation amount includes steps S1411 to S1412.
Step S1411: calculating a pre-calculationHeat load Q C ；
Calculating according to the indoor temperature distribution information and the outdoor temperature distribution information to obtain a predicted heat load Q C 。
Specifically, the predicted thermal load within the ith preset time interval Δt is denoted as Q C (i)，Q C (i) The expression of (2) is:when the number of preset time intervals Δt in the time of day is N, the heat load Q is predicted C The expression of (2) is. Wherein alpha is the heat transfer performance correction coefficient of the outer protecting structure of the user side building, F is the surface area of the outer protecting structure of the user side building, K is the average heat transfer coefficient of the outer protecting structure, n is the ventilation times of the user side building, and V 0 For the volume of the building on the user side,andthe specific heat capacity and the density of the indoor air at the user side in the ith preset time interval are respectively,andthe indoor temperature and the outdoor temperature of the user side in the ith preset time interval respectively.
Step S1412: calculate the heat storage quantity Q of the water tank S ；
According to the illumination radiation intensity information, the heat storage quantity Q of the water tank is calculated S 。
Specifically, the stored heat of the water tank within the ith preset time interval delta t is recorded as Q S (i) Heat storage quantity Q of water tank S (i) The expression of (2) is:when the number of preset time intervals deltat in the time of day is N, the water tank stores heat Q S The expression of (2) is. Wherein,for the rate of heat loss from the tank,is the effective lighting area of the solar heat collecting plate,for the intercept efficiency (dimensionless) of the solar collector plate,for the solar irradiance within the ith preset time interval deltat.
In an alternative embodiment, the first working medium in the heat storage water tank is water, the water in the heat storage water tank with the temperature greater than T1 is recorded as a high-temperature heat source, the water in the heat storage water tank with the temperature lower than or equal to T1 is recorded as a low-temperature heat source, and optionally, T1 is 45 ℃. Heat storage quantity Q of water tank S Including a first heat storage quantity Q S1 And a second heat storage quantity Q S2 The solar heat collecting plate, the heat storage water tank and the first heat exchanger in the multi-energy complementary heating system form a solar heat pump, and the first heat storage quantity Q S1 The solar heat pump heating quantity in the multi-energy complementary heating system is provided by a high-temperature heat source in the heat storage water tank; second heat storage quantity Q S2 And the heat is transmitted to terminal heating equipment of a user through the heat storage water tank, the water-cooling evaporator of the auxiliary heating module and the second heat exchanger.
Step S142: calculating auxiliary heating quantity;
according to the system parameter set of the multi-energy complementary heating system, the auxiliary heating quantity Q is calculated AW Auxiliary heating quantity Q AW Including air source heat pump heating quantity Q A Heating quantity Q of water source heat pump W Optionally, the auxiliary heating quantity Q AW Can also comprise other energy heat pump systemsHeat quantity.
In an alternative embodiment, the auxiliary heating capacity includes an air source heat pump capacity Q A And heating quantity Q of water source heat pump W The heating capacity of the air source heat pump within the ith preset time interval delta t is recorded as Q A (i) The heating capacity of the water source heat pump is recorded as Q W (i) When the number of preset time intervals deltat in one day is N, Q A (i) The expression of (2) isHeating quantity Q of air source heat pump A The expression of (2) isThe method comprises the steps of carrying out a first treatment on the surface of the For the heating quantity of the water source heat pump, the second heat storage quantity Q in the compressor and the heat storage water tank in the auxiliary heating system S2 Contribution due to the second heat-accumulating quantity Q S2 Heat storage quantity Q in water tank S Has been counted, therefore, the heating quantity Q of the water source heat pump in the embodiment W Removing the second heat storage quantity Q S2 At this time, Q W (i) The expression of (2) is，Q W The expression of (2) isThereby calculating and obtaining the auxiliary heating quantity Q AW The expression of (2) is。
Step S143: constructing a first constraint condition;
based on the heat storage quantity Q of the water tank S Auxiliary heating quantity Q AW Constructing a first constraint condition, wherein the expression is as follows:。
in an alternative embodiment, the second constraint is a mass balance constraint, and the expression of the second constraint isWherein F is si F is the first water inlet flow of the heat storage water tank so Is the first water outlet flow of the heat storage water tank, F hi Is the flow rate of the second water inlet of the heat storage water tank, F ho Is the second water outlet flow of the heat storage water tank, dV tank The volume change of the first working medium in the heat storage water tank in the time interval dt is obtained. When the dt is approaching the value of 0,the value of (2) is the volume change rate of the first working medium in the heat storage water tank.
Optionally, the time interval dt takes a value as a preset time interval Δt, and the volume change of the first working medium in the thermal storage water tank in Δt is recorded as Δv tank The first water inlet flow F is obtained through a flow sensor si First water outlet flow F so Flow rate F of second water inlet hi And a second water outlet flow F ho The expression of the second constraint is:wherein, the method comprises the steps of, wherein,the volume of the first working medium flowing from the solar heat collecting plate to the heat storage water tank in the ith preset time interval delta t is as follows:wherein C is w And ρ w The specific heat capacity and the density of the first working medium are respectively,the water outlet temperature of the solar heat collecting plate in the ith preset time interval delta t,the temperature of the first working medium in the heat storage water tank in the ith preset time interval delta t is obtained.
In an alternative embodiment, the third constraint is a temperature constraint, the third constraintThe expression of the condition is: t (T) min ≤T tank ≤T max Wherein T is min The temperature lower limit of the first working medium in the heat storage water tank of the multi-energy complementary heating system is T tank Is the temperature of the first working medium in the heat storage water tank, T max Is the upper temperature limit of the first working medium in the heat storage water tank. Alternatively T min At 10 ℃, T max Is 85 ℃.
Step S15: forming second operation control information;
and eliminating the unit operation control table which does not meet the constraint condition in the first operation control information based on the constructed constraint condition of the objective function so as to form second operation control information.
In this embodiment, forming the second operation control information includes the steps of:
substituting the operation working conditions corresponding to the unit operation control table in the first operation control information into constraint conditions;
judging whether the constraint condition is satisfied;
when the constraint condition is met, reserving the unit operation control table as second operation control information;
when the constraint condition is not established, rejecting the unit operation control table;
repeating the steps until the judgment of all the unit operation control tables in the first operation control information is completed, so as to form second operation control information.
Because of the plurality of unit operation control tables of the first operation control information, at least one operation condition which does not meet the constraint condition may exist, the operation condition cannot meet the constraint condition, may be caused by failing to meet the heat requirement of the user side, or may affect the normal operation of the multi-energy complementary heating system, or may be caused by other possible situations. The number of the unit operation control tables can be effectively reduced by eliminating the unit operation control tables which do not meet the constraint conditions, so that the operation amount is reduced, and the operation efficiency is improved.
Step S16: calculating the value W of the objective function C Obtaining the minimum value of the running control table;
according to the second operationControl information is calculated to obtain an objective function value W C The minimum value of the (2) is obtained, a corresponding unit operation control table is obtained as an operation control table of the multi-energy complementary heating system, and the objective function takes the value W C The unit operation control tables are in one-to-one correspondence with the unit operation control tables in the second operation control information.
In an alternative embodiment, referring to FIG. 3, the objective function value W is calculated C Comprises steps S161 to S164.
S161: extracting a j-th unit operation control table;
and acquiring a j-th unit operation control table in the second operation control information, wherein j is a positive integer.
S162: calculating an objective function value W corresponding to a j-th unit operation control table C (j)；
Substituting the operation working conditions corresponding to the j-th unit operation control table into the objective function, and calculating a corresponding objective function value W C (j)。
S163: forming the target function value W C ；
Changing the value of j and repeating the steps until all the unit operation control tables in the second operation control information are traversed to form an objective function value W C 。
S164: acquiring an operation control table;
obtaining the value W of the objective function C And extracting a corresponding unit operation control table as an operation control table of the multi-energy complementary heating system.
In an alternative embodiment, all the unit operation control tables in the second operation control information can be traversed through an optimizing algorithm, and the objective function value W corresponding to each unit operation control table is obtained through calculation C (j) Thereby forming the objective function value W C Obtaining the value W of the objective function C And extracting a corresponding unit operation control table as an operation control table of the multi-energy complementary heating system. Further, when the objective function takes the value W C When the number of the operation control tables corresponding to the minimum value is multiple, obtaining a plurality of unit operation control tables corresponding to the operation control tables, and taking one of the unit operation control tables as the operation controlAnd (5) tabulating.
Step S17: controlling the operation of the multi-energy complementary heating system according to the operation control table;
and controlling the multi-energy complementary heating system to work according to the operation control table through a control cabinet of the multi-energy complementary heating system.
In an alternative embodiment, the modes of operation of the multi-energy complementary heating system include a solar heat pump mode of operation, a water source heat pump mode of operation, and an air source heat pump mode of operation. Acquiring the heat storage quantity Q of the water tank according to weather prediction information S And predicting the thermal load Q C When the multi-energy complementary heating system works according to the operation control table, the heat storage quantity Q of the water tank can be stored S Dispensing occurs during heating. Controlling the multifunctional complementary heating system to work in a water source heat pump working mode at night with lower outdoor temperature; in a period of time with higher working efficiency of the air-cooled evaporator, controlling the multi-energy complementary heating system to work in an air source heat pump working mode; and when the temperature of the user side is detected to be unable to meet the requirement, the working mode of the multi-energy complementary heating system is adjusted to enable the multi-energy complementary heating system to work in an air source heat pump working mode or a water source heat pump working mode. The multi-energy complementary heating system is enabled to work in an air source heat pump working mode in a time period with higher working efficiency of the air-cooled evaporator, and frosting time of the air-cooled heat pump can be shortened; the working mode of the water source heat pump is started at night with lower temperature, the second heat accumulation amount of the low-temperature heat source in the heat accumulation water tank can be effectively utilized, the air-cooled evaporator is prevented from working in a period with lower efficiency, the coefficient of performance and the energy utilization rate of the heat pump cycle are improved, and therefore the coefficient of performance of the multi-energy complementary heating system is improved.
According to the heating control method provided by the embodiment, the first operation control information is generated according to the preset time interval delta t, the objective function taking the predicted power consumption as the function value is established according to the system parameter set, and the constraint condition of the objective function is established to eliminate the unit operation control table which does not meet the constraint condition in the first operation control information, so that the second operation control table is formed, the operand can be effectively reduced, and the calculation efficiency is improved; the optimizing algorithm traverses all the unit operation control tables in the second operation control table to obtain the minimum value of the objective function value, and extracts the corresponding unit operation control table as the operation control table, so that the operation cost of the heating system can be effectively reduced while the heating reliability and the comfort of the system are ensured, the performance coefficient and the energy utilization rate of the heating system are improved, the operation control information of one day in the future is generated according to weather forecast information, and the operation stability of the heating system is effectively improved every deltat, so that the system has the advantages of low operation cost, high energy utilization rate, good stability and the like, and is beneficial to popularization and use of products.
Example two
The present embodiment provides a multi-energy complementary heating system for executing any one of the heating control methods described in the first embodiment, and referring to fig. 4, the multi-energy complementary heating system includes a solar heat collecting module 11, a heat storage tank 12, an auxiliary heating module 13, a user side heating module 14, and a circulation pump unit 15.
Referring to fig. 4 and 5, the solar heat collecting module 11 includes a solar heat collecting plate 111, a heat collecting water inlet 112 and a heat collecting water outlet 113, a first working medium flows in from the heat collecting water inlet 112, flows out from the heat collecting water outlet 113 through the solar heat collecting plate 111, and the solar heat collecting plate 111 can heat the first working medium flowing therein by solar energy, alternatively, the first working medium is water.
In an alternative embodiment, the solar collector module 11 is further provided with an irradiation instrument 114 and a first control valve 101. The irradiance meter 114 is used for obtaining irradiance of sunlight and is mounted on the solar heat collecting plate 111; two first control valves 101 are arranged in the solar heat collection module 11, one is arranged at the heat collection water inlet 112 and used for controlling the flow rate of the first working medium flowing into the solar heat collection plate 111, and the other is arranged at the heat collection water outlet 113 and used for controlling the flow rate of the first working medium flowing out of the solar heat collection plate 111. A temperature sensor 103 is also provided in the open space outside the room where the solar collector module 11 is located to acquire the outdoor temperature.
The heat storage water tank 12 is used for storing a first working medium, a first water inlet 121, a first water outlet 122, a second water inlet 123 and a second water outlet 124 are arranged in the heat storage water tank 12, the first water inlet 121 is communicated with the heat collection water outlet 113 through a pipeline, and the first water outlet 122 is communicated with the heat collection water inlet 112 through a pipeline. Optionally, a temperature sensor 103 is further provided in the heat storage tank 12, for acquiring the temperature of the first working medium in the heat storage tank 12.
The auxiliary heating module 13 has an auxiliary heat first water inlet 1301, an auxiliary heat first water outlet 1302, an auxiliary heat second water inlet 1303 and an auxiliary heat second water outlet 1304, wherein the auxiliary heat first water inlet 1301 communicates with the second water outlet 124, and the auxiliary heat first water outlet 1302 communicates with the second water inlet 123.
In this embodiment, referring to fig. 5, the auxiliary heating module 13 further includes an air-cooled evaporator 131, a water-cooled evaporator 132, a compressor 133, a three-way valve 134, a throttle valve 135, and a second heat exchanger 136. Wherein the air-cooled evaporator 131, the compressor 133, the three-way valve 134, the second heat exchanger 136 and the throttle valve 135 constitute an air source heat pump; the water-cooled evaporator 132, the compressor 133, the three-way valve 134, the second heat exchanger 136, and the throttle valve 135 constitute a water source heat pump. The air-cooled evaporator 131 is connected to the heat storage tank 12 through the auxiliary heat first water inlet 1301 and the auxiliary heat first water outlet 1302, and the first working medium flowing out from the second water outlet 124 of the heat storage tank 12 flows into the heat storage tank 12 through the auxiliary heat first water inlet 1301, the water-cooled evaporator 132, the auxiliary heat first water outlet 1302, and the second water inlet 123.
In an alternative embodiment, a flow sensor 104 is disposed at the auxiliary heat second water outlet 1304 to obtain the flow of the second working medium flowing in the pipeline at the corresponding position; a flow sensor 104 is also provided at the auxiliary heat first water outlet 1302 to obtain the flow of the first working medium flowing in the pipeline at the corresponding position.
The user-side heating module 14 has a terminal first water inlet 1401, a terminal first water outlet 1402, a terminal second water inlet 1403, and a terminal second water outlet 1404, the terminal first water inlet 1401 communicates with the second water outlet 124, the terminal first water outlet 1402 communicates with the second water inlet 123, the terminal second water inlet 1403 communicates with the auxiliary heat second water outlet 1304, and the terminal second water outlet 1404 communicates with the auxiliary heat second water inlet 1303.
In this embodiment, referring to fig. 5, the user side heating module 14 further includes an end heating apparatus 141, a first heat exchanger 142, a first control valve 101, and a second control valve 102. The end heating device 141 is provided in the user room for providing heat to the user room, and an input end and an output end of the end heating device 141 are respectively communicated with the auxiliary heat second water outlet 1304 and the auxiliary heat second water inlet 1303, and with an output end and an input end of the first heat exchanger 142. The second control valve 102 is disposed between the first heat exchanger 142 and the terminal heating device 141, optionally, the second control valve 102 is a three-way valve, the second control valve 102 in the user side heating module 14 includes two second control valves, ports of one second control valve 102 are respectively communicated with an output end of the terminal heating device 141, the auxiliary heat second water inlet 1303 and an input end of the first heat exchanger 142, and ports of the other second control valve 102 are respectively communicated with an input end of the terminal heating device 141, the auxiliary heat second water outlet 1304 and an output end of the first heat exchanger 142. The first control valves 101 in the user side heating module 14 comprise 6 first control valves 101, wherein the 4 first control valves 101 are respectively arranged at an input end and an output end of the terminal heating equipment 141, and an input end and an output end of the first heat exchanger 142 communicated with the terminal heating equipment 141, and are used for controlling the flow of the second working medium flowing in the pipeline; the other 2 first control valves 101 are disposed at the end first water inlet 1401 and the end first water outlet 1402, and are used for controlling the flow of the first working medium flowing in the pipeline.
In an alternative embodiment, the output end of the terminal heating device 141 is further provided with a temperature sensor 103 and a flow sensor 104, which are used for respectively acquiring the temperature and the flow of the second working medium flowing in the pipeline at the corresponding position, the user room is provided with the temperature sensor 103, which is used for acquiring the temperature in the user room, and the input end of the terminal heating device 141 is provided with the temperature sensor 103, so as to acquire the temperature of the second working medium, and optionally, the second working medium is water.
Referring to fig. 5, a second control valve 102 is further provided between the heat storage tank 12 and the user side heating module 14 or the auxiliary heating module 13, and the second control valve 102 includes two ports, wherein one port of the second control valve 102 is respectively communicated with the second water outlet 124, the auxiliary heat first water inlet 1301 and the end first water inlet 1401, and the other port of the second control valve 102 is respectively communicated with the second water inlet 123, the auxiliary heat first water outlet 1302 and the end first water outlet 1402. Alternatively, the second control valve 102 is a three-way valve.
The circulating pump unit 15 comprises a solar circulating pump 151, a water tank circulating pump 152 and a hot water circulating pump 153, wherein the solar circulating pump 151 is arranged between the first water outlet 122 of the heat storage water tank 12 and the solar heat collecting plate 111, the first water outlet 122 is communicated with the heat collecting water inlet 112 through the solar circulating pump 151, and the solar circulating pump 151 is used for providing power for a first working medium flowing to the solar heat collecting plate 111; the second water outlet 124 of the heat storage water tank 12 is respectively communicated with the auxiliary heat first water inlet 1301 and the tail end first water inlet 1401 through the water tank circulating pump 152, and the water tank circulating pump 152 is used for providing power for the first working medium flowing out of the heat storage water tank 12; a hot water circulation pump 153 is provided in the user side heating module 14 for powering the second working fluid flowing in the user side heating module 14.
The multi-energy complementary heating system of this embodiment further includes a control cabinet 16, where the control cabinet 16 is in communication connection with the solar heat collecting module 11, the heat storage water tank 12, the auxiliary heating module 13, the user side heating module 14 and the circulation pump unit 15, and further, the control cabinet 16 is in communication connection with the temperature sensor 103, the flow sensor 104 and the irradiation instrument 114. The control cabinet 16 can control the normal operation of the multi-energy complementary heating system.
The multi-energy complementary heating system provided by the embodiment controls the multi-energy complementary heating system to work through the control cabinet according to any one of the heating control methods provided by the first embodiment, so that the multi-energy complementary heating system has the beneficial effects of the first embodiment as well.
The foregoing embodiments are merely illustrative of the principles of the present application and their effectiveness, and are not intended to limit the application. Modifications, variations, or combinations of the above-described embodiments may be made by those skilled in the art without departing from the spirit and scope of the present application. Accordingly, it is intended that all equivalent modifications and variations which may be accomplished by persons skilled in the art without departing from the spirit and technical spirit of the disclosure be covered by the claims of this application.
Claims (7)
1. A heating control method applied to a multi-energy complementary heating system, comprising the following steps:
generating first operation control information of the multi-energy complementary heating system according to a preset time interval delta t, wherein the first operation control information comprises a plurality of unit operation control tables;
acquiring weather forecast information;
constructing an objective function according to a system parameter set of the multi-energy complementary heating system, and predicting the power consumption W C Take the value as an objective function, wherein the objective function is W C =W 1 +W 2 +W 3 Wherein W is 1 For the power consumption of the circulating pump unit, W 2 For compressor power consumption, W 3 The power consumption of the air-cooled evaporator is reduced;
constructing constraint conditions of the objective function according to the weather prediction information and the system parameter set, wherein the constraint conditions comprise a first constraint condition, a second constraint condition and a third constraint condition, and the first constraint condition is Q C =Q S +Q AW The second constraint condition is dV tank =（F si +F hi -F so -F ho ) dt, the third constraint is T min ≤T tank ≤T max Wherein Q is C To predict thermal load, Q S To store heat for water tank, Q AW dV for assisting heating quantity tank For the volume change quantity of the first working medium in the heat storage water tank of the multi-energy complementary heating system within the time interval dt, F si 、F hi 、F so 、F ho The first water inlet flow, the second water inlet flow, the first water outlet flow and the second water outlet flow of the heat storage water tank are respectively, the third constraint condition is a temperature constraint condition, and T is a temperature constraint condition min T is the lower temperature limit of the first working medium in the heat storage water tank tank T is the temperature of the first working medium in the heat storage water tank max The upper temperature limit of the first working medium in the heat storage water tank is set;
rejecting a unit operation control table which does not meet the constraint condition in the first operation control information to form second operation control information;
according to the second operation control information, calculating to obtain the target function value W C The minimum value of the multi-energy complementary heating system is obtained, and a corresponding unit operation control table is obtained as an operation control table of the multi-energy complementary heating system;
controlling the multi-energy complementary heating system to work according to the operation control table;
wherein, the multi-energy complementary heating system includes:
the solar heat collecting module comprises a solar heat collecting plate, a heat collecting water inlet and a heat collecting water outlet;
the circulating pump unit comprises a solar circulating pump, a water tank circulating pump and a hot water circulating pump;
the heat storage water tank is provided with a first water inlet, a first water outlet, a second water inlet and a second water outlet, the first water inlet is communicated with the heat collection water outlet, and the first water outlet is communicated with the heat collection water inlet through the solar circulating pump;
the auxiliary heating module is provided with an auxiliary heating first water inlet, an auxiliary heating first water outlet, an auxiliary heating second water inlet and an auxiliary heating second water outlet, the auxiliary heating first water inlet is communicated with the second water outlet through the water tank circulating pump, and the auxiliary heating first water outlet is communicated with the second water inlet;
the user side heating module is provided with a tail end first water inlet communicated with the second water outlet, a tail end first water outlet communicated with the second water inlet, a tail end second water inlet communicated with the auxiliary heating second water outlet and a tail end second water outlet communicated with the auxiliary heating second water inlet, and the hot water circulating pump is arranged in the user side heating module so as to provide power for a second working medium flowing in the user side heating module;
the control cabinet is in communication connection with the solar heat collection module, the auxiliary heating module, the heat storage water tank, the user side heating module and the circulating pump unit.
2. The heating control method according to claim 1, wherein the weather prediction information includes indoor temperature distribution information, outdoor temperature distribution information, and illumination radiation intensity information.
3. The heating control method according to claim 1, wherein constructing an objective function from the system parameter set of the multi-energy complementary heating system comprises the steps of:
acquiring the operation parameters of a circulating pump unit, the operation parameters of a compressor and the operation parameters of an air-cooled evaporator;
according to the operation parameters of the circulating pump unit, calculating to obtain the power consumption W of the circulating pump unit 1 ；
According to the operation parameters of the compressor, the power consumption W of the compressor is calculated 2 ；
Determining the power of the air-cooled evaporator of the multi-energy complementary heating system according to the weather prediction information and the operation parameters of the air-cooled evaporator to calculate and obtain the power consumption W of the air-cooled evaporator 3 ；
Constructing the objective function: w (W) C =W 1 +W 2 +W 3 。
4. A heating control method according to claim 3, wherein the circulation pump unit power consumption W 1 Comprises the power consumption W of a solar circulating pump 11 Power consumption W of water tank circulating pump 12 And the power consumption W of the hot water circulating pump 13 。
5. The heating control method according to claim 1, wherein the first constraint is a heat balance constraint, and constructing the first constraint of the objective function includes the steps of:
according to the weather forecast information, calculating to obtain a forecast heat load Q C And the heat storage quantity Q of the water tank S The predicted thermal load Q C For the user to predict the required heat, the water tank stores heat Q S Heating the solar heat collecting plate of the multi-energy complementary heating system;
according to the system parameter set, calculating to obtain auxiliary heating quantity Q AW ；
Constructing the first constraint condition: q (Q) C =Q S +Q AW 。
6. The heating control method according to claim 5, characterized in that the auxiliary heating amount Q AW Including air source heat pump heating quantity Q A And heating quantity Q of water source heat pump W 。
7. The heating control method according to claim 1, wherein the second constraint is a mass balance constraint, and constructing the second constraint of the objective function includes the steps of:
acquiring a first water outlet flow F of a heat storage water tank of the multi-energy complementary heating system so First water inlet flow F si Second water outlet flow F ho And a second water inlet flow F hi ；
Acquiring the volume change dV of the first working medium in the heat storage water tank in the time interval dt tank ；
Constructing the second constraint condition: dV (dV) tank =（F si +F hi -F so -F ho ）dt。
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| CN102520675B (en) * | 2011-10-23 | 2014-03-12 | 西安交通大学 | Gas-steam combined cycle and solar power generation combined heating system and scheduling method thereof |
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| CN110070198A (en) * | 2018-01-22 | 2019-07-30 | 山东大学 | One kind is provided multiple forms of energy to complement each other building energy system and its energy storage method for optimizing configuration |
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