CN109764561B - Energy system and control method thereof - Google Patents
Energy system and control method thereof Download PDFInfo
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- CN109764561B CN109764561B CN201910018816.XA CN201910018816A CN109764561B CN 109764561 B CN109764561 B CN 109764561B CN 201910018816 A CN201910018816 A CN 201910018816A CN 109764561 B CN109764561 B CN 109764561B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E10/40—Solar thermal energy, e.g. solar towers
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Abstract
The invention belongs to the field of energy utilization, and discloses an energy system and a control method thereof, wherein the energy system comprises: solar collector, water heater and transfer heat exchanger, communicate with the form of heat conduction through the transfer heat exchanger between solar collector and the water heater, the method includes: determining the initial temperature of the solar heat collector and the initial temperature of the water heater; conducting the opening degree of the valve according to the initial temperature; determining the temperature of the solar heat collector and the water heater during the first time; and based on the calculated heat exchange coefficient k, controlling whether the heat conduction valve of the transit heat exchanger is closed or not according to the heat exchange coefficient k, the target temperature of the water heater, the temperature of the water heater when the heat conduction valve of the transit heat exchanger is opened for the first time period and the temperature of the solar heat collector when the heat conduction valve of the transit heat exchanger is opened for the first time period. The invention ensures that the heat conducting valve is closed under the condition that the heat of the solar heat collector is not enough to heat the water heater to the target temperature, thereby avoiding the waste of the heat in the solar heat collector.
Description
Technical Field
The invention relates to the technical field of energy utilization, in particular to an energy system and a control method thereof.
Background
An energy source is a resource capable of providing energy, and the energy source generally refers to heat energy, electric energy, light energy, mechanical energy, chemical energy, and the like. The water heater is a device which can increase the temperature of cold water into hot water in a certain time by various physical principles. The water heater needs to absorb heat when cold water is changed into hot water, and the water heater is usually heated by electric energy or gas. The solar heat collector can absorb sunlight and generate heat, and the heat of the solar heat collector can be transferred to the water heater for use. Generally, heat transfer between the solar heat collector and the water heater is controlled according to the temperature of the solar heat collector and the water heater, but sometimes the residual heat of the solar heat collector may not be enough for the water heater to heat to the target temperature, and at the moment, if the water heater is still used for heating, not only the use requirement of a user cannot be met, but also the heat in the solar heat collector is wasted.
Disclosure of Invention
The embodiment of the invention provides an energy system and a control method thereof, aiming at solving the problem of stopping the supply of heat of a solar heat collector when the heat of the solar heat collector is not enough to heat a hot water supply device to a target temperature. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
According to a first aspect of embodiments of the present invention, there is provided a control method of an energy system, the energy system including: the solar water heater comprises a solar heat collector, a water heater and a transfer heat exchanger, wherein the solar heat collector is communicated with the water heater in a heat conduction mode through the transfer heat exchanger, and the method comprises the following steps:
determining the initial temperature of the solar heat collector and the initial temperature of the water heater;
determining the opening degree of a heat conducting valve of the transit heat exchanger according to the initial temperatures of the solar heat collector and the water heater;
determining the temperature of the solar heat collector and the water heater when a heat conduction valve of the transfer heat exchanger is opened for a first time;
calculating heat transfer coefficient k, k ═ T1-T0)/(t0-t1) Wherein, T0Is the initial temperature, T, of the water heater1For the temperature t of the water heater when the heat conducting valve of the transfer heat exchanger is opened for the first time0Is the initial temperature of the solar collector, t1Opening a heat conducting valve of the transfer heat exchanger for the solar heat collector for the first time;
and controlling whether the heat conducting valve of the transit heat exchanger is closed or not according to the heat exchange coefficient k, the target temperature of the water heater, the temperature of the water heater when the heat conducting valve of the transit heat exchanger is opened for the first time period and the temperature of the solar heat collector when the heat conducting valve of the transit heat exchanger is opened for the first time period.
In some optional embodiments, the controlling whether the heat conducting valve of the intermediate heat exchanger is closed according to the heat exchange coefficient k, the target temperature of the water heater, the temperature of the water heater when the heat conducting valve of the intermediate heat exchanger is opened for the first time period, and the temperature of the solar heat collector when the heat conducting valve of the intermediate heat exchanger is opened for the first time period includes:
calculating the predicted temperature t' ═ t of the solar heat collector when the water heater reaches the target temperature1-[(T’-T1)/k]Where T' is the target temperature of the water heater, T1For the temperature t of the water heater when the heat conducting valve of the transfer heat exchanger is opened for the first time1The temperature of the solar heat collector is at the first time when a heat conducting valve of the transfer heat exchanger is opened, and k is a heat exchange coefficient;
comparing the T 'with the T', and when the T 'is more than or equal to the T', keeping the opening degree of a heat conducting valve of the transfer heat exchanger; and when T 'is less than T', controlling a heat conducting valve of the intermediate heat exchanger to be closed.
In some optional embodiments, when T 'is less than T', the method further includes prompting a user after controlling the heat conducting valve of the intermediate heat exchanger to close.
In some alternative embodiments, the first time period is 5min to 7 min.
In some optional embodiments, the determining the opening degree of the heat conducting valve of the intermediate heat exchanger according to the initial temperatures of the solar heat collector and the water heater comprises:
calculating the difference delta T of the initial temperatures of the solar heat collector and the water heater;
and setting the opening degree of the heat conducting valve according to the magnitude relation between the delta T and the first preset value and the second preset value.
In some optional embodiments, the setting the opening degree of the heat conducting valve according to the magnitude relationship between Δ T and the first preset value and the second preset value includes:
when the delta T is smaller than or equal to a first preset value, setting the heat conduction valve to be a first opening degree;
when the delta T is larger than a first preset value and smaller than or equal to a second preset value, setting the heat conduction valve to be at a second opening degree;
when the delta T is larger than a second preset value, setting the heat conduction valve to be a third opening degree;
the first opening degree is smaller than the second opening degree, the second opening degree is smaller than the third opening degree, and the first preset value is smaller than the second preset value.
According to a second aspect of embodiments of the present invention, there is provided an energy source system comprising:
a solar collector for providing heat;
a water heater for absorbing heat;
the transfer heat exchanger is connected in series between the solar heat collector and the water heater and is provided with a heat conduction valve for controlling the flow of a heat conduction medium;
and the controller is used for controlling the opening of a heat conducting valve of the transfer heat exchanger.
In some optional embodiments, the controller comprises:
the temperature sensor is used for determining the initial temperature of the solar heat collector and the initial temperature of the water heater; determining the temperature of the solar heat collector and the water heater when a heat conduction valve of the transfer heat exchanger is opened for a first time;
the first control unit is used for determining the opening degree of a heat conduction valve of the transit heat exchanger according to the initial temperatures of the solar heat collector and the water heater;
a calculating unit for calculating heat exchange coefficient k, k ═ T1-T0)/(t0-t1) Wherein, T0Is the initial temperature, T, of the water heater1For the temperature t of the water heater when the heat conducting valve of the transfer heat exchanger is opened for the first time0Is the initial temperature of the solar collector, t1Opening a heat conducting valve of the transfer heat exchanger for the solar heat collector for the first time;
and the second control unit is used for controlling whether the heat conduction valve of the transit heat exchanger is closed or not according to the heat exchange coefficient k, the target temperature of the water heater, the temperature of the water heater in the first time period and the temperature of the solar heat collector in the first time period.
In some optional embodiments, the second control unit comprises:
a first calculating subunit, for calculating the predicted temperature t' ═ t of the solar heat collector when the water heater reaches the target temperature1-[(T’-T1)/k]Wherein T' is a water heaterTarget temperature of (T)1For the temperature t of the water heater when the heat conducting valve of the transfer heat exchanger is opened for the first time1The temperature of the solar heat collector is at the first time when a heat conducting valve of the transfer heat exchanger is opened, and k is a heat exchange coefficient;
the first control subunit is used for comparing the T 'with the T', and when the T 'is greater than or equal to the T', the opening degree of a heat conduction valve of the transfer heat exchanger is kept; and when T 'is less than T', controlling a heat conducting valve of the intermediate heat exchanger to be closed.
In some optional embodiments, the first control unit specifically includes:
the second calculating subunit is used for calculating the difference value delta T of the initial temperatures of the solar heat collector and the water heater;
and the second control subunit is used for setting the opening of the heat conducting valve according to the size relation between the delta T and the first preset value and the second preset value.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
through the initial temperature of solar collector and water heater, the heat conduction valve aperture of transfer heat exchanger is controlled, when the heat conduction valve opened first time length, combines the temperature condition of solar collector and water heater, controls the aperture of heat conduction valve once more to make solar collector under the heat is not enough to heat the water heater and heat to the condition of target temperature, the heat conduction valve is closed, avoids thermal waste in the solar collector.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a flowchart illustrating a control method of an energy system according to an exemplary embodiment;
fig. 2 is a schematic diagram of an energy system according to an exemplary embodiment;
fig. 3 is a flowchart illustrating a control method of an energy system according to another exemplary embodiment;
fig. 4 is a flowchart illustrating a control method of an energy system according to another exemplary embodiment;
fig. 5 is a block diagram illustrating a controller of an energy system according to an exemplary embodiment;
fig. 6 is a block diagram illustrating a configuration of a controller of an energy system according to another exemplary embodiment;
fig. 7 is a block diagram illustrating a configuration of a controller of an energy system according to another exemplary embodiment;
fig. 8 is a schematic structural view of the relay heat exchanger according to an exemplary embodiment.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments herein to enable those skilled in the art to practice them. Portions and features of some embodiments may be included in or substituted for those of others. The scope of the embodiments herein includes the full ambit of the claims, as well as all available equivalents of the claims. The terms "first," "second," and the like, herein are used solely to distinguish one element from another without requiring or implying any actual such relationship or order between such elements. In practice, a first element can also be referred to as a second element, and vice versa. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a structure, apparatus, or device that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such structure, apparatus, or device. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a structure, device or apparatus that comprises the element. The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like herein, as used herein, are defined as orientations or positional relationships based on the orientation or positional relationship shown in the drawings, and are used for convenience in describing and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. In the description herein, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may include, for example, mechanical or electrical connections, communications between two elements, direct connections, and indirect connections via intermediary media, where the specific meaning of the terms is understood by those skilled in the art as appropriate.
Herein, the term "plurality" means two or more, unless otherwise specified.
Herein, the character "/" indicates that the preceding and following objects are in an "or" relationship. For example, A/B represents: a or B.
Herein, the term "and/or" is an associative relationship describing objects, meaning that three relationships may exist. For example, a and/or B, represents: a or B, or A and B.
A control method of an energy system, as shown in fig. 2, the energy system includes: the solar water heater comprises a solar heat collector 1011, a water heater 1021 and a transfer heat exchanger 11, wherein the solar heat collector 1011 and the water heater 1021 are communicated in a heat conduction mode through the transfer heat exchanger 11, as shown in fig. 1, the method comprises the following steps:
s201, determining the initial temperature of a solar heat collector and the initial temperature of a water heater;
s202, determining the opening degree of a heat conducting valve of the transit heat exchanger according to the initial temperatures of the solar heat collector and the water heater;
s203, determining the temperature of the solar heat collector and the water heater when a heat conduction valve of the transfer heat exchanger is opened for a first time;
s204, calculating the heat exchange coefficient k, k ═ T1-T0)/(t0-t1) Wherein, T0Is the initial temperature, T, of the water heater1For the temperature t of the water heater when the heat conducting valve of the transfer heat exchanger is opened for the first time0Is the initial temperature of the solar collector, t1Opening a heat conducting valve of the transfer heat exchanger for the solar heat collector for the first time;
s205, controlling whether the heat conducting valve of the transit heat exchanger is closed or not according to the heat exchange coefficient k, the target temperature of the water heater, the temperature of the water heater when the heat conducting valve of the transit heat exchanger is opened for the first time period and the temperature of the solar heat collector when the heat conducting valve of the transit heat exchanger is opened for the first time period.
In S201, initial temperatures of the solar collector and the water heater are detected by providing a temperature sensor. Optionally, a temperature sensor for detecting the temperature of the water heater is provided on the outer sidewall of the water tank of the water heater or on the inner tank of the water heater. The actual temperature of the water heater is determined by detecting the temperature of the outer side wall of the water tank of the water heater, or the actual temperature of the water heater is determined by detecting the temperature of the inner container of the water heater. In S202, a heat conduction valve of the relay heat exchanger is used to control the circulation of the heat conduction medium between the solar heat collector and the water heater, and when the flow rate of the heat conduction medium is constant, the opening of the heat conduction valve is increased, and the flow rate of the heat conduction medium is increased; the opening of the heat-conducting valve is reduced, and the flow of the heat-conducting medium is reduced.
In S203, the temperature of the solar collector and the water heater when the heat conducting valve of the intermediate heat exchanger is opened for the first time period may be detected by the temperature sensor. Optionally, the first time period is 5min to 7 min. The temperature of the solar thermal collector and the temperature of the water heater are detected when the heat conduction valve is opened for the first time period, and the initial temperature of the solar thermal collector and the initial temperature of the water heater are combined, so that the heat exchange condition between the solar thermal collector and the water heater can be reflected. In S204, the heat exchange coefficient k can reflect the temperature of the water heater to be increased by 1 ℃ when the solar heat collector is lowered, namely the heat exchange of the solar heat collector to the heat exchangerAnd (5) effect. Exemplary, T1＝34℃，T0＝30℃，t0＝70℃，t162 ℃, then k ═ T2-T1)/(t1-t2) 0.5 for (34-30)/(70-62). In S205, it may be determined whether the remaining heat of the solar thermal collector can satisfy the requirement that the water heater is heated to the target temperature according to the heat exchange coefficient k, the target temperature of the water heater, and the temperature of the water heater and the solar thermal collector when the heat conducting valve of the relay heat exchanger is opened for the first time. In this way, the supply of heat from the solar collector can be stopped when the heat from the solar collector is insufficient to heat the water heater to the target temperature.
Alternatively, as shown in fig. 2, the solar collector 100 is in heat-conducting communication with the intermediate heat exchanger 102 through a first end heat exchanger 101, and the water heater 104 is in heat-conducting communication with the intermediate heat exchanger 102 through a second end heat exchanger 103. The first end heat exchanger 101 is used for absorbing heat generated by the solar collector 100 and transferring the heat to the intermediate heat exchanger 102, and the second end heat exchanger 103 is used for absorbing heat in the intermediate heat exchanger 102 and transferring the heat to the water heater 104. Thus, the heat of the solar heat collector is favorably transferred to the water heater.
In an embodiment of the present invention, as shown in fig. 3, the controlling the opening degree of the heat conducting valve of the transit heat exchanger according to the heat exchange coefficient k, the target temperature of the water heater, the temperature of the water heater at the first time, and the temperature of the solar heat collector at the first time comprises:
s301, calculating the predicted temperature t' ═ t of the solar heat collector when the water heater reaches the target temperature1-[(T’-T1)/k]Where T' is the target temperature of the water heater, T1For the temperature t of the water heater when the heat conducting valve of the transfer heat exchanger is opened for the first time1The temperature of the solar heat collector is at the first time when a heat conducting valve of the transfer heat exchanger is opened, and k is a heat exchange coefficient;
s302, comparing the T 'with the T', and when the T 'is larger than or equal to the T', keeping the opening degree of a heat conducting valve of the transfer heat exchanger; and when T 'is less than T', controlling a heat conducting valve of the intermediate heat exchanger to be closed.
In the embodiment, the predicted temperature of the solar heat collector when the water heater reaches the target temperature can be obtained through calculation, when T 'is greater than or equal to T', the solar heat collector is indicated to have sufficient energy to heat the water heater to the target temperature, the opening degree of a heat conduction valve of the transfer heat exchanger can be maintained, and the water heater is continuously heated; and when T 'is less than T', the residual heat of the solar heat collector is not enough to heat the water heater to the target temperature, and the heat conducting valve of the transfer heat exchanger is controlled to be closed to stop heating the water heater. Exemplary, t1＝150℃，T’＝55℃，T1＝32℃，k＝0.6，t’＝t1-[(T’-T1)/k]＝150-[(55-32)/0.6]112 ℃, T '> T', indicating that the solar heat collector has enough heat to heat the water heater to the target temperature, and the opening degree of the heat conducting valve of the intermediate heat exchanger can be maintained. Exemplary, t1＝80℃，T’＝55℃，T1＝32℃，k＝0.6，t’＝t1-[(T’-T1)/k]＝80-[(55-32)/0.6]And (4) if the temperature T 'is less than T' and is 42 ℃, indicating that the heat of the solar heat collector is insufficient, closing a heat conducting valve of the intermediate transfer heat exchanger. Therefore, under the condition that the heat of the solar heat collector is not enough to be heated to the target temperature by the hot water supply device, the heat supply of the solar heat collector is stopped, and the waste of heat is avoided. If the target temperature of the water heater is adjusted to be low, executing the steps S301 and S302 again, and when T 'is larger than or equal to T', taking the temperature of the solar heat collector and the water heater at the first time as the initial temperature, determining the opening degree of a heat conducting valve of the transit heat exchanger according to S202, and keeping the opening degree of the heat conducting valve of the transit heat exchanger; and when T 'is less than T', controlling a heat conducting valve of the intermediate heat exchanger to be closed.
In an embodiment of the present invention, when T 'is less than T', after controlling the heat conducting valve of the intermediate heat exchanger to close, prompting the user is further included. Therefore, the user can know that the water heater cannot be heated to the target temperature, and the user can conveniently make next selection.
In one embodiment of the invention, the first period of time is 5min to 7 min.
In one embodiment of the present invention, as shown in fig. 4, the determining the opening degree of the heat conducting valve of the intermediate heat exchanger according to the initial temperatures of the solar heat collector and the water heater comprises:
s303, calculating the difference delta T of the initial temperatures of the solar heat collector and the water heater;
s304, setting the opening degree of the heat conducting valve according to the magnitude relation between the delta T and the first preset value and the second preset value.
In S303, Δ T ═ T0-T0Wherein t is0Is the actual temperature, T, of the water heater0Is the target temperature of the water heater. Exemplary, T0At 40 deg.C, 45 deg.C, 48 deg.C, 50 deg.C, 52 deg.C, 55 deg.C, 60 deg.C or 65 deg.C. The target temperature of the water heater can be set by a user. In S304, two preset values are set, Δ T is compared with the two preset values, and the opening degree of the heat transfer valve is set according to the comparison result. In this way, the heat transfer medium between the solar collector and the water heater can transfer heat at a suitable flow rate.
In one embodiment of the present invention, setting the opening degree of the heat conducting valve according to the magnitude relationship between Δ T and the first preset value and the second preset value includes:
when the delta T is smaller than or equal to a first preset value, setting the heat conduction valve to be a first opening degree;
when the delta T is larger than a first preset value and smaller than or equal to a second preset value, setting the heat conduction valve to be at a second opening degree;
when the delta T is larger than a second preset value, setting the heat conduction valve to be a third opening degree;
the first opening degree is larger than the second opening degree, the second opening degree is larger than the third opening degree, and the first preset value is smaller than the second preset value.
Optionally, the first opening degree is 81% to 100%, the second opening degree is 61% to 80%, and the third opening degree is 40% to 60%. Optionally, the first preset value is 20 ℃ and the second preset value is 50 ℃. Under the condition that the flow rate of the heat-conducting medium is constant, when the actual temperature difference between the water heater and the solar heat collector is large, the opening degree of the heat-conducting valve is set to be small, so that the flow of the heat-conducting medium is reduced, and the temperature of the water heater can still be quickly increased; when the difference between the actual temperature and the target temperature of the water heater is small, the opening degree of the heat conduction valve can be set to be larger, so that the temperature can reach the target temperature in time.
As shown in fig. 2, an energy system includes:
a solar collector 1011 for providing heat;
a water heater 1021 for absorbing heat;
the transfer heat exchanger 11 is connected in series between the solar heat collector 1011 and the water heater 1021, and the transfer heat exchanger 11 is provided with a heat conduction valve for controlling the flow of a heat conduction medium;
and the controller is used for controlling the opening of the heat conducting valve of the intermediate heat exchanger 11.
In an optional embodiment, the solar heat collector 1011 is communicated with the transfer heat exchanger 11 through the first terminal heat exchanger 1 in a heat conduction manner, the water heater 1021 is communicated with the transfer heat exchanger 11 in a heat conduction manner through the second terminal heat exchanger 2, the first terminal heat exchanger 1 and the second terminal heat exchanger 2 are both provided with a liquid inlet pipe 141 and a liquid outlet pipe 142 (i.e., a group of communicating pipe set 14), and are communicated with the heat exchange device of the transfer heat exchanger 11 through two pipes, and heat conversion is performed among the solar heat collector 1011, the water heater 1021 and the transfer heat exchanger 11 through respective heat-conducting medium circulation passages.
In the relay heat exchanger 11 according to the embodiment of the present invention, when the heat absorbing end 111 of the relay heat exchanger 11 is communicated to the solar heat collector 1011, the heat releasing end 112 is communicated to the water heater, and the solar heat collector 1011 supplies heat to the water heater 1021 through the relay heat exchanger 11.
Alternatively, as shown in fig. 8, the intermediate heat exchanger 11 includes:
a heat absorption end 111 for communicating with a solar heat collector 1011;
a heat releasing end 112 for communicating with a water heater 1021;
the unidirectional heat conducting device 120, the heat absorbing end 111 and the heat releasing end 112 are disposed at both ends of the unidirectional heat conducting device 120.
In an alternative embodiment, the heat absorbing end 111 of the intermediate heat exchanger 11 is implemented by a heat exchanging device, such as a plate heat exchanger, an evaporator, or a heat exchanging coil. The heat releasing end 112 is embodied by a heat exchanging device, such as a plate heat exchanger, a condenser, or a heat exchanging coil.
In an alternative embodiment, the solar heat collector 1 and the water heater 2 are embodied by heat exchange devices, such as plate heat exchangers, evaporators or heat exchange coils.
In the present embodiment, the unidirectional heat conducting device 120 realizes the (forced) heat exchange from the heat absorbing end 111 to the heat releasing end 112. Specifically, a refrigerant heat exchanger or a semiconductor temperature regulator may be used.
In an alternative embodiment, the refrigerant heat exchanger includes an evaporator 121, a compressor (not shown), a condenser 122 and an expansion valve (not shown), which are connected to form a heat exchange circuit. The intermediate heat exchanger 11 comprises two heat absorption chambers 113 and two heat release chambers 114 which are arranged in a heat insulation way; the evaporator 121 is disposed opposite to the heat absorbing end 111 of the intermediate heat exchanger 11 and is disposed in the heat absorbing chamber 113; the condenser 122 is disposed opposite to the heat releasing end 112 of the relay heat exchanger 11 and is disposed in the heat releasing chamber 114.
In one embodiment of the present invention, as shown in fig. 5, the energy system further includes a controller 400, the controller 400 including:
a temperature sensor 410 for determining an initial temperature of the solar collector and an initial temperature of the water heater; determining the temperature of the solar heat collector and the water heater when a heat conduction valve of the transfer heat exchanger is opened for a first time;
the first control unit 420 is used for determining the opening degree of a heat conducting valve of the transit heat exchanger according to the initial temperatures of the solar heat collector and the water heater;
a calculating unit 430 for calculating the heat transfer coefficient k, k ═ T1-T0)/(t0-t1) Wherein, T0Is the initial temperature, T, of the water heater1For the temperature t of the water heater when the heat conducting valve of the transfer heat exchanger is opened for the first time0Is the initial temperature of the solar collector, t1Opening a heat conducting valve of a solar heat collector in a transfer heat exchangerTemperature over a period of time;
the second control unit 440 is configured to control whether the heat conduction valve of the transit heat exchanger is closed according to the heat exchange coefficient k, the target temperature of the water heater, the temperature of the water heater when the heat conduction valve of the transit heat exchanger is opened for the first time period, and the temperature of the solar heat collector when the heat conduction valve of the transit heat exchanger is opened for the first time period.
In this embodiment, the temperature conditions of the solar collector and the water heater are determined by the temperature sensor 410, the first control unit 440 controls the opening degree of the heat conduction valve according to the initial temperatures of the solar collector and the water heater, the calculation unit 430 calculates the heat exchange coefficient k, and the second control unit 450 controls whether the heat conduction valve is closed according to the heat exchange coefficient k and other parameters. When the heat exchange coefficient k and other parameters indicate that the heat of the solar heat collector is not enough to heat the water heater to the target temperature, closing a heat conducting valve of the intermediate heat exchanger; and when the heat exchange coefficient k and other parameters indicate that the heat of the solar heat collector is enough to heat the water heater to the target temperature, keeping the opening degree of a heat conducting valve of the transfer heat exchanger to continuously heat the water heater. Therefore, under the condition that the heat of the solar heat collector is not enough to be heated to the target temperature by the hot water supply device, the heat supply of the solar heat collector is stopped, and the waste of heat is avoided.
In one embodiment of the present invention, as shown in fig. 6, the second control unit 440 includes:
a first calculating subunit 441, configured to calculate an estimated temperature t' ═ t of the solar heat collector when the water heater reaches the target temperature1-[(T’-T1)/k]Where T' is the target temperature of the water heater, T1For the temperature t of the water heater when the heat conducting valve of the transfer heat exchanger is opened for the first time1The temperature of the solar heat collector is at the first time when a heat conducting valve of the transfer heat exchanger is opened, and k is a heat exchange coefficient;
the first control subunit 442, configured to compare the magnitudes of T 'and T', and when T 'is greater than or equal to T', maintain the opening degree of the heat conducting valve of the intermediate heat exchanger; and when T 'is less than T', controlling a heat conducting valve of the intermediate heat exchanger to be closed.
In this embodiment, the second control unit 440 calculates the expected temperature of the solar collector when the water heater reaches the target temperature through the first calculating subunit 441, and the first control subunit 442 controls the heat conducting valve based on the result of the first calculating subunit 441.
In an embodiment of the present invention, as shown in fig. 7, the first control unit 420 specifically includes:
the second calculating subunit 421, configured to calculate a difference Δ T between the initial temperatures of the solar thermal collector and the water heater;
and the second control subunit 422 is configured to set the opening degree of the heat conducting valve according to a magnitude relationship between Δ T and the first preset value and the second preset value.
In the present embodiment, Δ T ═ T0-T0Wherein t is0Is the initial temperature, T, of the solar collector0Is the initial temperature of the water heater. The second calculating subunit 421 calculates Δ T, and the second controlling subunit 422 sets the opening degree of the heat conducting valve according to the magnitude relationship between Δ T and the first and second preset values.
With regard to the above-described embodiment apparatus, the specific manner in which each unit performs the operation has been described in detail in the embodiment related to the method, and will not be described in detail here.
The present invention is not limited to the structures that have been described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (7)
1. A control method of an energy system, characterized in that the energy system comprises: the solar water heater comprises a solar heat collector, a water heater and a transfer heat exchanger, wherein the solar heat collector is communicated with the water heater in a heat conduction mode through the transfer heat exchanger, and the method comprises the following steps:
determining the initial temperature of the solar heat collector and the initial temperature of the water heater;
determining the opening degree of a heat conducting valve of the transit heat exchanger according to the initial temperatures of the solar heat collector and the water heater;
determining the temperature of the solar heat collector and the water heater when a heat conduction valve of the transfer heat exchanger is opened for a first time;
calculating heat transfer coefficient k, k ═ T1-T0)/(t0-t1) Wherein, T0Is the initial temperature, T, of the water heater1For the temperature t of the water heater when the heat conducting valve of the transfer heat exchanger is opened for the first time0Is the initial temperature of the solar collector, t1Opening a heat conducting valve of the transfer heat exchanger for the solar heat collector for the first time;
calculating the predicted temperature t' ═ t of the solar heat collector when the water heater reaches the target temperature1-[(T’-T1)/k]Where T' is the target temperature of the water heater, T1For the temperature t of the water heater when the heat conducting valve of the transfer heat exchanger is opened for the first time1The temperature of the solar heat collector is at the first time when a heat conducting valve of the transfer heat exchanger is opened, and k is a heat exchange coefficient;
comparing the T 'with the T', and when the T 'is more than or equal to the T', keeping the opening degree of a heat conducting valve of the transfer heat exchanger; and when T 'is less than T', controlling a heat conducting valve of the intermediate heat exchanger to be closed.
2. The method for controlling the energy system according to claim 1, wherein when T 'is less than T', the method further comprises prompting a user after controlling the heat conducting valve of the intermediate heat exchanger to be closed.
3. The control method of the energy system according to claim 1, wherein the first period of time is 5 to 7 min.
4. The method for controlling the energy system according to claim 1, wherein the determining the opening degree of the heat conducting valve of the intermediate heat exchanger according to the initial temperatures of the solar heat collector and the water heater comprises:
calculating the difference delta T of the initial temperatures of the solar heat collector and the water heater;
and setting the opening degree of the heat conducting valve according to the magnitude relation between the delta T and the first preset value and the second preset value.
5. The method for controlling the energy system according to claim 4, wherein the setting the opening degree of the heat conducting valve according to the magnitude relationship between Δ T and the first and second preset values comprises:
when the delta T is smaller than or equal to a first preset value, setting the heat conduction valve to be a first opening degree;
when the delta T is larger than a first preset value and smaller than or equal to a second preset value, setting the heat conduction valve to be at a second opening degree;
when the delta T is larger than a second preset value, setting the heat conduction valve to be a third opening degree;
the first opening degree is smaller than the second opening degree, the second opening degree is smaller than the third opening degree, and the first preset value is smaller than the second preset value.
6. An energy system, comprising:
a solar collector for providing heat;
a water heater for absorbing heat;
the transfer heat exchanger is connected in series between the solar heat collector and the water heater and is provided with a heat conduction valve for controlling the flow of a heat conduction medium;
a controller, comprising:
the temperature sensor is used for determining the initial temperature of the solar heat collector and the initial temperature of the water heater; determining the temperature of the solar heat collector and the water heater when a heat conduction valve of the transfer heat exchanger is opened for a first time;
the first control unit is used for determining the opening degree of a heat conduction valve of the transit heat exchanger according to the initial temperatures of the solar heat collector and the water heater;
a calculating unit for calculating heat exchange coefficient k, k ═ T1-T0)/(t0-t1) Wherein, T0Is the initial temperature, T, of the water heater1For water heaters in transit heat exchangersTemperature t of the heat-conducting valve at the first time period0Is the initial temperature of the solar collector, t1Opening a heat conducting valve of the transfer heat exchanger for the solar heat collector for the first time;
a second control unit comprising: a first calculating subunit, for calculating the predicted temperature t' ═ t of the solar heat collector when the water heater reaches the target temperature1-[(T’-T1)/k]Where T' is the target temperature of the water heater, T1For the temperature t of the water heater when the heat conducting valve of the transfer heat exchanger is opened for the first time1The temperature of the solar heat collector is at the first time when a heat conducting valve of the transfer heat exchanger is opened, and k is a heat exchange coefficient; the first control subunit is used for comparing the T 'with the T', and when the T 'is greater than or equal to the T', the opening degree of a heat conduction valve of the transfer heat exchanger is kept; and when T 'is less than T', controlling a heat conducting valve of the intermediate heat exchanger to be closed.
7. The energy system according to claim 6, wherein the first control unit comprises:
the second calculating subunit is used for calculating the difference value delta T of the initial temperatures of the solar heat collector and the water heater;
and the second control subunit is used for setting the opening of the heat conducting valve according to the size relation between the delta T and the first preset value and the second preset value.
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Effective date of registration: 20201126 Address after: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Applicant after: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. Applicant after: Haier Zhijia Co.,Ltd. Address before: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Applicant before: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. |
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