CN109764561B - An energy system and its control method - Google Patents

Abstract

The invention belongs to the field of energy utilization, and discloses an energy system and a control method thereof. The energy system includes a solar collector, a water heater and an intermediate conversion heat exchanger. The method includes: determining the initial temperature of the solar collector and the initial temperature of the water heater; conducting the valve opening according to the initial temperature; determining the temperature of the solar collector and the water heater for the first time period; The heat transfer coefficient k, the target temperature of the water heater, the temperature when the heat conduction valve of the water heater is in the middle of the conversion heat exchanger is opened for the first time, the temperature when the heat conduction valve of the solar collector is in the middle of the conversion heat is opened for the first time, and the control is in the middle of the conversion. Whether the heat transfer valve of the heater is closed. The invention enables the solar heat collector to close the heat conduction valve when the heat is insufficient to supply the water heater to the target temperature, so as to avoid waste of heat in the solar heat collector.

Description

An energy system and its control method

technical field

The invention relates to the technical field of energy utilization, in particular to an energy system and a control method thereof.

Background technique

Energy is a resource that can provide energy, and energy usually refers to thermal energy, electrical energy, light energy, mechanical energy, chemical energy, etc. A water heater refers to a device that increases the temperature of cold water into hot water within a certain period of time through various physical principles. The water heater needs to absorb heat when it turns cold water into hot water, and usually uses electricity or gas to heat the water heater. The solar collector can absorb sunlight and generate heat, and the heat of the solar collector can be transferred to the water heater for use. Generally, the heat transfer between the solar collector and the water heater is controlled according to the temperature of the solar collector, but sometimes the residual heat of the solar collector may not be enough to heat the water heater to the target temperature. demand, and waste heat in the solar collector.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide an energy system and a control method thereof, so as to solve how to stop the heat supply of the solar thermal collector when the heat of the solar thermal collector is insufficient to heat the water heater to a target temperature. In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended to be an extensive review, nor is it intended to identify key/critical elements or delineate the scope of protection of these embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the detailed description that follows.

According to a first aspect of the embodiments of the present invention, there is provided a control method of an energy system, the energy system includes: a solar collector, a water heater, and an intermediate conversion heat exchanger, and the solar collector and the water heater pass through the intermediate heat exchanger. The recuperators are communicated in a thermally conductive manner, the method comprising:

Determine the initial temperature of the solar collector and the initial temperature of the water heater;

Determine the opening degree of the heat conduction valve of the intermediate heat exchanger according to the initial temperature of the solar collector and the water heater;

Determine the temperature when the heat conduction valve of the solar collector and the water heater is opened for the first period of time;

Calculate the heat transfer coefficient k, k=(T ₁ -T ₀ )/(t ₀ -t ₁ ), where T ₀ is the initial temperature of the water heater, and T ₁ is the first time when the heat conduction valve of the water heater is in the middle of the conversion heat exchanger , t ₀ is the initial temperature of the solar collector, and t ₁ is the temperature at which the heat conduction valve of the solar collector is in the middle of the conversion heat when the heat conduction valve is opened for the first time;

According to the heat exchange coefficient k, the target temperature of the water heater, the temperature when the heat conduction valve of the water heater is in the middle of the conversion heat exchanger is opened for the first time, and the temperature when the heat conduction valve of the solar collector is in the middle of the conversion heat is opened for the first time. Whether the heat transfer valve of the heat exchanger is closed.

In some optional embodiments, the method is based on the heat transfer coefficient k, the target temperature of the water heater, the temperature at which the heat conduction valve of the water heater is switched on for a first period of time, the heat conduction valve of the solar collector switched in Turn on the temperature for the first time, and control whether the heat transfer valve of the heat exchanger is closed, including:

Calculate the expected temperature of the solar collector when the water heater reaches the target temperature t'=t ₁ -[(T'-T ₁ )/k], where T' is the target temperature of the water heater, and T ₁ is the heat exchanger in the middle of the water heater is the temperature when the heat conduction valve of the solar collector is opened for the first time, t ₁ is the temperature when the heat conduction valve of the solar collector is in the middle of the heat exchanger is opened for the first time, and k is the heat transfer coefficient;

Compare the size of t' and T', when t' is greater than or equal to T', keep the opening of the heat transfer valve of the intermediate heat exchanger; when t' is less than T', control the heat transfer valve of the intermediate heat exchanger to close.

In some optional embodiments, when t' is less than T', after the heat conduction valve of the conversion heat exchanger is closed under control, a prompt is also included to the user.

In some optional embodiments, the first duration is 5 min to 7 min.

In some optional embodiments, determining the opening degree of the heat conduction valve of the intermediate heat exchanger according to the initial temperature of the solar collector and the water heater includes:

Calculate the difference ΔT between the initial temperature of the solar collector and the water heater;

According to the magnitude relationship between ΔT and the first preset value and the second preset value, the opening degree of the heat conduction valve is set.

In some optional embodiments, the setting of the opening degree of the heat conduction valve according to the magnitude relationship between ΔT and the first preset value and the second preset value includes:

When ΔT is less than or equal to the first preset value, set the heat conduction valve to the first opening degree;

When ΔT is greater than the first preset value and less than or equal to the second preset value, set the heat conduction valve to the second opening degree;

When ΔT is greater than the second preset value, set the heat conduction valve to the third opening degree;

Wherein, the first opening degree is less than the second opening degree, the second opening degree is less than the third opening degree, and the first preset value is less than the second preset value.

According to a second aspect of the embodiments of the present invention, an energy system is provided, including:

Solar collectors for providing heat;

water heaters, for absorbing heat;

an intermediate heat exchanger, which is connected in series between the solar collector and the water heater, and the intermediate heat exchanger has a heat conduction valve for controlling the flow rate of the heat conduction medium;

The controller is used for controlling the opening degree of the heat conduction valve of the intermediate conversion heat exchanger.

In some optional embodiments, the controller includes:

a temperature sensor for determining the initial temperature of the solar collector and the initial temperature of the water heater; and determining the temperature of the solar collector and the water heater when the heat conduction valve of the heat transfer heater is opened for a first period of time;

a first control unit, configured to determine the opening degree of the heat conduction valve of the intermediate heat exchanger according to the initial temperature of the solar collector and the water heater;

The calculation unit is used to calculate the heat transfer coefficient k, k=(T ₁ -T ₀ )/(t ₀ -t ₁ ), where T ₀ is the initial temperature of the water heater, and T ₁ is the heat conduction valve of the heat exchanger in the middle of the water heater The temperature at the time of opening the first time period, t ₀ is the initial temperature of the solar collector, and t ₁ is the temperature when the heat conduction valve of the solar collector is in the middle of the conversion heat exchanger when the heat conduction valve is opened for the first time period;

The second control unit is used to control whether the heat conduction valve of the conversion heat exchanger is closed according to the heat exchange coefficient k, the target temperature of the water heater, the temperature of the water heater during the first period of time, and the temperature of the solar collector during the first period of time.

In some optional embodiments, the second control unit includes:

The first calculation subunit is used to calculate the expected temperature of the solar collector when the water heater reaches the target temperature t'=t ₁ -[(T'-T ₁ )/k], where T' is the target temperature of the water heater, T ₁ is the temperature at which the heat-conducting valve of the water heater in the middle of the conversion heater is opened for the first time, t ₁ is the temperature when the heat-conducting valve of the solar collector is in the middle of the conversion heat when the heat-conducting valve is opened for the first time, and k is the heat transfer coefficient;

The first control sub-unit is used to compare the size of t' and T'. When t' is greater than or equal to T', the opening degree of the heat conduction valve of the middle conversion heat exchanger is maintained; when t' is less than T', the middle conversion heat is controlled. The heat transfer valve of the device is closed.

In some optional embodiments, the first control unit specifically includes:

The second calculation subunit is used to calculate the difference ΔT of the initial temperature of the solar collector and the water heater;

The second control subunit is used for setting the opening degree of the heat conduction valve according to the magnitude relationship between ΔT and the first preset value and the second preset value.

The technical solutions provided by the embodiments of the present invention may include the following beneficial effects:

Through the initial temperature of the solar collector and the water heater, the opening degree of the heat conduction valve of the middle conversion heat exchanger is controlled. When the heat conduction valve is opened for the first time, the opening degree of the heat conduction valve is checked again according to the temperature of the solar collector and the water heater. Control, so that when the heat of the solar collector is not enough to heat the water heater to the target temperature, the heat conduction valve is closed to avoid the waste of heat 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.

Description of 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 of a control method of an energy system according to an exemplary embodiment;

FIG. 2 is a schematic structural diagram of an energy system according to an exemplary embodiment;

FIG. 3 is a flowchart of a control method of an energy system according to another exemplary embodiment;

FIG. 4 is a flowchart of a control method of an energy system according to another exemplary embodiment;

FIG. 5 is a structural block diagram of a controller of an energy system according to an exemplary embodiment;

6 is a structural block diagram of a controller of an energy system according to another exemplary embodiment;

7 is a structural block diagram of a controller of an energy system according to another exemplary embodiment;

FIG. 8 is a schematic structural diagram of an intermediate heat exchanger according to an exemplary embodiment.

Detailed ways

The following description and drawings sufficiently illustrate the 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 other embodiments. The scope of the embodiments herein includes the full scope of the claims, along with all available equivalents of the claims. Herein, the terms "first," "second," etc. are only used to distinguish one element from another, and do not require or imply any actual relationship or order between the elements. In fact the first element can also be called the second element and vice versa. Furthermore, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a structure, device or device comprising a list of elements includes not only those elements, but also others not expressly listed elements, or elements inherent to such structures, devices, or equipment. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in the structure, apparatus or device that includes the element. The various embodiments herein are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and it is sufficient to refer to each other for the same and similar parts between the various embodiments.

The terms "portrait", "landscape", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", "top", " The orientation or positional relationship indicated by "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the text and simplifying the description, rather than indicating or implying that the indicated device or element must be It has a specific orientation, is constructed and operates in a specific orientation, and therefore should not be construed as a limitation of the present invention. In the description herein, unless otherwise specified and limited, the terms "installed", "connected" and "connected" should be construed in a broad sense, for example, it may be a mechanical connection or an electrical connection, or the internal communication between two elements, It can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific situations.

As used herein, unless stated otherwise, the term "plurality" means two or more.

In this article, the character "/" indicates that the preceding and following objects are in an "or" relationship. For example, A/B means: A or B.

Herein, the term "and/or" is an associative relationship describing objects, indicating that three relationships can exist. For example, A and/or B, means: A or B, or, A and B three relationships.

A control method of an energy system, as shown in FIG. 2, the energy system includes: a solar collector 1011, a water heater 1021 and an intermediate conversion heat exchanger 11. The form of heat conduction is connected, as shown in Figure 1, and the method includes:

S201, determine the initial temperature of the solar collector and the initial temperature of the water heater;

S202, determining the opening degree of the heat conduction valve of the intermediate heat exchanger according to the initial temperature of the solar collector and the water heater;

S203, determining the temperature at which the heat conduction valve of the solar collector and the water heater is in the middle of the conversion heater when the heat conduction valve is opened for a first period of time;

S204. Calculate the heat transfer coefficient k, k=(T ₁ -T ₀ )/(t ₀ -t ₁ ), where T ₀ is the initial temperature of the water heater, and T ₁ is the first time that the heat conduction valve of the water heater converts the heat exchanger in the middle The temperature during the time period, t ₀ is the initial temperature of the solar collector, and t ₁ is the temperature when the heat conduction valve of the solar collector is in the middle of the conversion heat exchanger is opened for the first period of time;

S205, according to the heat exchange coefficient k, the target temperature of the water heater, the temperature when the heat conduction valve of the water heater is in the middle of the conversion heat exchanger is opened for the first time period, and the temperature when the heat conduction valve of the solar collector in the middle conversion heat exchanger is opened for the first time period, Whether the heat transfer valve of the heat exchanger in the control is closed.

In S201, the initial temperature of the solar collector and the water heater is detected by setting the temperature sensor. Optionally, a temperature sensor for detecting the temperature of the water heater is arranged on the outer side wall of the water heater tank 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 wall of the water heater tank, or the actual temperature of the water heater is determined by detecting the temperature of the inner tank of the water heater. In S202, the heat conduction valve of the intermediate conversion heat exchanger is used to control the circulation of the heat conduction medium between the solar collector and the water heater. When the flow rate of the heat conduction medium is constant, the opening of the heat conduction valve increases and the flow rate of the heat conduction medium increases. ; The opening of the heat conduction valve is reduced, and the flow rate of the heat conduction medium is reduced.

In S203, the temperature at which the heat conduction valve of the solar collector and the water heater in the middle conversion heat exchanger is opened for a first period of time may be detected by the temperature sensor. Optionally, the first duration is 5 min to 7 min. By detecting the temperature of the solar collector and the water heater when the heat conduction valve is opened for the first time, combined with the initial temperatures of the two, the heat exchange between the solar collector and the water heater can be reflected. In S204, the heat exchange coefficient k can reflect how much the temperature of the water heater increases for every 1°C decrease of the solar heat collector, that is, the heat exchange effect of the solar heat collector on the heat exchanger. Exemplarily, T ₁ =34°C, T ₀ =30°C, t ₀ =70°C, t ₁ =62°C, then k=(T ₂ -T ₁ )/(t ₁ -t ₂ )=(34- 30)/(70-62)=0.5. In S205, according to the heat exchange coefficient k, the target temperature of the water heater, and the temperature when the heat conduction valve of the water heater and the solar heat collector is in the middle conversion heat exchanger for a first period of time, it can be determined whether the remaining heat of the solar heat collector can satisfy the water heater Heat to target temperature. In this way, when the heat of the solar thermal collector is insufficient to heat the water heater to the target temperature, the supply of heat to the solar thermal collector can be stopped.

Optionally, as shown in FIG. 2 , the solar heat collector 100 communicates with the middle conversion heat exchanger 102 through the first terminal heat exchanger 101 in the form of heat conduction, and the water heater 104 communicates with the middle conversion heat exchanger 102 through the second end heat exchanger 103 . Connected by heat conduction. The first terminal heat exchanger 101 is used to absorb the heat generated by the solar heat collector 100 and transfer the heat to the middle conversion heat exchanger 102, and the second terminal heat exchanger 103 is used to absorb the heat in the middle conversion heat exchanger 102, and transfer the heat to the middle conversion heat exchanger 102. It is passed to the water heater 104 . In this way, it is beneficial to transfer the heat from the solar collector to the water heater.

In an embodiment of the present invention, as shown in FIG. 3 , according to the heat exchange coefficient k, the target temperature of the water heater, the temperature of the water heater during the first period of time, and the temperature of the solar heat collector during the first period of time, the conversion during control The opening of the heat conduction valve of the heater, including:

S301. Calculate the expected temperature of the solar collector when the water heater reaches the target temperature t'=t ₁ -[(T'-T ₁ )/k], where T' is the target temperature of the water heater, and T ₁ is the conversion of the water heater in the middle The temperature when the heat conduction valve of the heat exchanger is opened for the first time, t ₁ is the temperature when the heat conduction valve of the solar collector is in the middle of the conversion heat exchanger is opened for the first time, k is the heat transfer coefficient;

S302, compare the size of t' and T', when t' is greater than or equal to T', keep the opening of the heat conduction valve of the intermediate heat exchanger; when t' is less than T', control the heat conduction valve of the intermediate heat exchanger to close.

In this embodiment, the estimated temperature of the solar collector when the water heater reaches the target temperature can be obtained through calculation. When t' is greater than or equal to T', it indicates that the solar collector has sufficient energy to heat the water heater to the target temperature, and it can be Keep the opening of the heat conduction valve of the middle conversion heat exchanger and continue to heat the water heater; when t' is less than T', it indicates that the remaining heat of the solar collector is not enough to heat the water heater to the target temperature, at this time, control the heating of the middle conversion heat exchanger. The heat transfer valve is closed and the water heater is no longer heated. Exemplarily, t ₁ =150°C, T'=55°C, T ₁ =32°C, k=0.6, t'=t ₁ -[(T'-T ₁ )/k]=150-[(55- 32)/0.6]=112°C, t'>T', indicating that the solar collector has sufficient heat to heat the water heater to the target temperature, which can maintain the opening of the heat conduction valve of the intermediate heat exchanger. Exemplarily, t ₁ =80°C, T'=55°C, T ₁ =32°C, k=0.6, t'=t ₁ -[(T'-T ₁ )/k]=80-[(55- 32)/0.6]=42°C, t'<T', indicating that the heat of the solar heat collector is insufficient, then close the heat conduction valve of the middle conversion heat exchanger. In this way, when the heat of the solar heat collector is insufficient to heat the water heater to the target temperature, the supply of heat to the solar heat collector can be stopped, thereby avoiding heat waste. If it is used to lower the target temperature of the water heater, perform steps S301 and S302 again. When t' is greater than or equal to T', take the temperature of the solar collector and the water heater for the first time period as the initial temperature, and determine according to S202 The opening degree of the heat conduction valve of the intermediate heat exchanger is maintained; when t' is less than T', the heat conduction valve of the intermediate heat exchanger is controlled to be closed.

In an embodiment of the present invention, when t' is less than T', after the heat conduction valve of the heat exchanger under control is closed, a prompt is also included to the user. In this way, the user can be informed that the water heater cannot be heated to the target temperature, which is convenient for the user to make the next choice.

In an embodiment of the present invention, the first duration is 5 min to 7 min.

In an embodiment of the present invention, as shown in FIG. 4 , the opening degree of the heat conduction valve of the intermediate heat exchanger is determined according to the initial temperature of the solar collector and the water heater, including:

S303, calculate the difference ΔT of the initial temperature of the solar collector and the water heater;

S304. Set the opening degree of the heat conduction valve according to the magnitude relationship between ΔT and the first preset value and the second preset value.

In S303, ΔT=t ₀ -T ₀ , where t ₀ is the actual temperature of the water heater, and T ₀ is the target temperature of the water heater. Exemplarily, T ₀ is 40°C, 45°C, 48°C, 50°C, 52°C, 55°C, 60°C, or 65°C. The target temperature of the water heater may be obtained by the user setting the water heater. In S304, two preset values are set, ΔT is compared with the two preset values, and the opening degree of the heat conduction valve is set according to the comparison result. In this way, the heat transfer medium between the solar thermal collector and the water heater can transfer heat at a suitable flow rate.

In an embodiment of the present invention, according to the magnitude relationship between ΔT and the first preset value and the second preset value, setting the opening of the heat conduction valve includes:

When ΔT is less than or equal to the first preset value, set the heat conduction valve to the first opening degree;

When ΔT is greater than the first preset value and less than or equal to the second preset value, set the heat conduction valve to the second opening degree;

When ΔT is greater than the second preset value, set the heat conduction valve to the third opening degree;

Wherein, the first opening degree is greater than the second opening degree, the second opening degree is greater than the third opening degree, and the first preset value is less than the second preset value.

Optionally, the first opening degree is 81%-100%, the second opening degree is 61%-80%, and the third opening degree is 40%-60%. Optionally, the first preset value is 20°C, and the second preset value is 50°C. Under the condition that the flow rate of the heat transfer medium is constant, when the actual temperature difference between the water heater and the solar collector is large, the opening of the heat transfer valve should be set smaller, so that the flow rate of the heat transfer medium is reduced, and it can still be faster. When the difference between the actual temperature of the water heater and the target temperature is small, the opening of the heat conduction valve can be set larger to make the temperature reach the target temperature in time.

As shown in Figure 2, an energy system includes:

A solar collector 1011 for providing heat;

water heater 1021, for absorbing heat;

The intermediate heat exchanger 11 is connected in series between the solar collector 1011 and the water heater 1021, and the intermediate heat exchanger 11 has a heat conduction valve for controlling the flow rate of the heat conduction medium;

The controller is used to control the opening degree of the heat conduction valve of the intermediate heat exchanger 11 .

In an optional embodiment, the solar heat collector 1011 communicates with the middle conversion heat exchanger 11 through the first terminal heat exchanger 1 in the form of heat conduction, and the water heater 1021 communicates with the middle conversion heat exchanger 11 through the second end heat exchanger 2 In the form of heat conduction, the first terminal heat exchanger 1 and the second terminal heat exchanger 2 both have a liquid inlet pipe 141 and a liquid outlet pipe 142 (ie, a set of communication pipeline groups 14), which are connected to the middle through two pipelines. The heat exchange devices of the heat exchanger 11 communicate with each other, and the heat transfer between the solar heat collector 1011 , the water heater 1021 and the intermediate heat exchanger 11 is performed through the respective heat transfer medium circulation passages.

In the intermediate heat exchanger 11 of the embodiment of the present invention, when the heat absorbing end 111 of the intermediate heat exchanger 11 is connected to the solar heat collector 1011 , the heat releasing end 112 is connected to the water heater, and the solar heat collector 1011 passes through the intermediate heat exchanger 11 Heat is supplied to the water heater 1021 .

Optionally, as shown in FIG. 8 , the intermediate heat exchanger 11 includes:

The heat absorption end 111 is used for being connected to the solar heat collector 1011;

The heat release end 112 is used to communicate with the water heater 1021;

The unidirectional heat conduction device 120 , the heat absorption end 111 and the heat release end 112 are arranged at both ends of the unidirectional heat conduction device 120 .

In an optional embodiment, the heat absorbing end 111 of the intermediate heat exchanger 11 specifically adopts a heat exchange device, such as a plate heat exchanger, an evaporator or a heat exchange coil. The exothermic end 112 specifically adopts a heat exchange device, such as a plate heat exchanger, a condenser, or a heat exchange coil.

In an optional embodiment, the solar heat collector 1 and the water heater 2 specifically employ heat exchange devices, such as a plate heat exchanger, an evaporator, or a heat exchange coil.

In this embodiment, the unidirectional heat conduction device 120 realizes (forced) exchange of the heat from the heat absorption end 111 to the heat release end 112 . Specifically, a refrigerant heat exchanger or a semiconductor temperature regulator can be used.

In an optional 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 middle heat exchanger 11 includes two heat-absorbing chambers 113 and a heat releasing chamber 114 arranged with adiabatic insulation; the evaporator 121 is arranged opposite to the heat-absorbing end 111 of the middle heat exchanger 11 and is arranged in the heat-absorbing chamber 113 ; The condenser 122 is arranged opposite to the exothermic end 112 of the intermediate heat exchanger 11 and is arranged in the exothermic chamber 114 .

In an embodiment of the present invention, as shown in FIG. 5 , the energy system further includes a controller 400, and the controller 400 includes:

The temperature sensor 410 is used for determining the initial temperature of the solar collector and the initial temperature of the water heater; and determining the temperature of the solar collector and the water heater when the heat conduction valve of the heat transfer heater is opened for a first period of time;

the first control unit 420, configured to determine the opening degree of the heat conduction valve of the intermediate heat exchanger according to the initial temperature of the solar collector and the water heater;

The calculation unit 430 is used to calculate the heat transfer coefficient k, k=(T ₁ -T ₀ )/(t ₀ -t ₁ ), where T ₀ is the initial temperature of the water heater, and T ₁ is the heat conduction of the heat exchanger in the middle of the water heater The temperature when the valve is opened for the first period of time, t ₀ is the initial temperature of the solar collector, and t ₁ is the temperature when the heat conduction valve of the solar collector is in the middle of converting the heat exchanger to open for the first period of time;

The second control unit 440 is configured to open the heat conduction valve of the heat transfer heat exchanger in the middle of the solar collector according to the heat transfer coefficient k, the target temperature of the water heater, the temperature when the heat conduction valve of the water heater is in the middle of the conversion heat exchanger is opened for a first period of time, and the heat conduction valve of the solar heat collector in the middle conversion heat exchanger For a long time of temperature, control whether the heat conduction valve of the converter heat exchanger is closed.

In this embodiment, the temperature of the solar collector and the water heater is determined by the temperature sensor 410, the first control unit 440 controls the opening of the heat conduction valve according to the initial temperature of the solar collector and the water heater, and the calculation unit 430 calculates the heat transfer coefficient k, 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 transfer coefficient k and other parameters indicate that the heat of the solar collector is not enough to heat the water heater to the target temperature, the heat conduction valve of the middle conversion heat exchanger is closed; when the heat transfer coefficient k and other parameters indicate that the heat of the solar collector When it is enough to heat the water heater to the target temperature, keep the opening of the heat conduction valve of the intermediate conversion heat exchanger and continue to heat the water heater. In this way, when the heat of the solar heat collector is insufficient to heat the water heater to the target temperature, the supply of heat to the solar heat collector can be stopped, thereby avoiding heat waste.

In one embodiment of the present invention, as shown in FIG. 6 , the second control unit 440 includes:

The first calculation subunit 441 is used to calculate the expected temperature of the solar collector when the water heater reaches the target temperature t'=t ₁ -[(T'-T ₁ )/k], where T' is the target temperature of the water heater, T1 is the temperature when the heat conduction valve _of the water heater in the middle of the conversion heater is opened for the first time, _t1 is the temperature when the heat conduction valve of the solar collector is in the middle of the conversion heat when the heat conduction valve is opened for the first time, and k is the heat transfer coefficient;

The first control sub-unit 442 is used to compare the magnitudes of t' and T'. When t' is greater than or equal to T', the opening degree of the heat conduction valve of the intermediate conversion heat exchanger is maintained; when t' is less than T', the intermediate switching is controlled. The heat transfer valve of the heater is 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 calculation subunit 441 , and the first control subunit 442 controls the Thermal valve.

In an embodiment of the present invention, as shown in FIG. 7 , the first control unit 420 specifically includes:

The second calculation sub-unit 421 is used to calculate the difference ΔT of the initial temperature of the solar collector and the water heater;

The second control subunit 422 is configured to set the opening degree of the heat conduction valve according to the magnitude relationship between ΔT and the first preset value and the second preset value.

In this embodiment, ΔT=t ₀ -T ₀ , where t ₀ is the initial temperature of the solar collector, and T ₀ is the initial temperature of the water heater. The ΔT is calculated by the second calculation subunit 421, and the second control subunit 422 sets the opening of the heat conduction valve according to the magnitude relationship between the ΔT and the first preset value and the second preset value.

Regarding the device of the above-mentioned embodiment, the specific manner in which each unit performs the operation has been described in detail in the embodiment of 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 accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims (7)

1. A control method for an energy system, characterized in that the energy system comprises: a solar collector, a water heater, and an intermediate conversion heat exchanger, wherein the solar thermal collector and the water heater pass through the intermediate conversion heat exchanger to conduct heat transfer. Formally connected, the method includes: Determine the initial temperature of the solar collector and the initial temperature of the water heater; Determine the opening degree of the heat conduction valve of the intermediate heat exchanger according to the initial temperature of the solar collector and the water heater; Determine the temperature when the heat conduction valve of the solar collector and the water heater is opened for the first period of time; Calculate the heat transfer coefficient k, k=(T ₁ -T ₀ )/(t ₀ -t ₁ ), where T ₀ is the initial temperature of the water heater, and T ₁ is the first time when the heat conduction valve of the water heater is in the middle of the conversion heat exchanger , t ₀ is the initial temperature of the solar collector, and t ₁ is the temperature at which the heat conduction valve of the solar collector is in the middle of the conversion heat when the heat conduction valve is opened for the first time; Calculate the expected temperature of the solar collector when the water heater reaches the target temperature t'=t ₁ -[(T'-T ₁ )/k], where T' is the target temperature of the water heater, and T ₁ is the heat exchanger in the middle of the water heater is the temperature when the heat conduction valve of the solar collector is opened for the first time, t ₁ is the temperature when the heat conduction valve of the solar collector is in the middle of the heat exchanger is opened for the first time, and k is the heat transfer coefficient; Compare the size of t' and T', when t' is greater than or equal to T', keep the opening of the heat transfer valve of the intermediate heat exchanger; when t' is less than T', control the heat transfer valve of the intermediate heat exchanger to close. 2. The control method of an energy system according to claim 1, characterized in that, when t' is less than T', after the heat conduction valve of the heat exchanger in the control is closed, it also includes prompting the user. 3 . The control method of an energy system according to claim 1 , wherein the first duration is 5 min to 7 min. 4 . 4. The control method of an energy system according to claim 1, wherein the determining the opening degree of the heat conduction valve of the intermediate heat exchanger according to the initial temperature of the solar collector and the water heater comprises: Calculate the difference ΔT between the initial temperature of the solar collector and the water heater; According to the magnitude relationship between ΔT and the first preset value and the second preset value, the opening degree of the heat conduction valve is set. 5 . The control method of the energy system according to claim 4 , wherein the setting of the opening degree of the heat conduction valve according to the magnitude relationship between ΔT and the first preset value and the second preset value, comprising: 6 . : When ΔT is less than or equal to the first preset value, set the heat conduction valve to the first opening degree; When ΔT is greater than the first preset value and less than or equal to the second preset value, set the heat conduction valve to the second opening degree; When ΔT is greater than the second preset value, set the heat conduction valve to the third opening degree; Wherein, the first opening degree is less than the second opening degree, the second opening degree is less than the third opening degree, and the first preset value is less than the second preset value. 6. An energy system, characterized in that, comprising: Solar collectors for providing heat; water heaters, for absorbing heat; an intermediate heat exchanger, which is connected in series between the solar collector and the water heater, and the intermediate heat exchanger has a heat conduction valve for controlling the flow rate of the heat conduction medium; Controller, including: a temperature sensor for determining the initial temperature of the solar collector and the initial temperature of the water heater; and determining the temperature of the solar collector and the water heater when the heat conduction valve of the heat transfer heater is opened for a first period of time; a first control unit, configured to determine the opening degree of the heat conduction valve of the intermediate heat exchanger according to the initial temperature of the solar collector and the water heater; The calculation unit is used to calculate the heat transfer coefficient k, k=(T ₁ -T ₀ )/(t ₀ -t ₁ ), where T ₀ is the initial temperature of the water heater, and T ₁ is the heat conduction valve of the heat exchanger in the middle of the water heater The temperature at the time of opening the first time period, t ₀ is the initial temperature of the solar collector, and t ₁ is the temperature when the heat conduction valve of the solar collector is in the middle of the conversion heat exchanger when the heat conduction valve is opened for the first time period; The second control unit includes: a first calculation sub-unit for calculating the expected temperature of the solar collector when the water heater reaches the target temperature t'=t ₁ -[(T'-T ₁ )/k], where T' is the target temperature of the water heater, T ₁ is the temperature when the heat conduction valve of the water heater is in the middle of the conversion heater is opened for the first time, t ₁ is the temperature when the heat conduction valve of the solar collector in the middle of the conversion heat is opened for the first time, k is the heat transfer coefficient; the first control sub-unit is used to compare the size of t' and T', when t' is greater than or equal to T', keep the opening of the heat conduction valve of the middle conversion heat exchanger; when t' is less than T' , the heat transfer valve of the control heat exchanger is closed. 7. The energy system according to claim 6, wherein the first control unit specifically comprises: The second calculation subunit is used to calculate the difference ΔT of the initial temperature of the solar collector and the water heater; The second control subunit is used for setting the opening degree of the heat conduction valve according to the magnitude relationship between ΔT and the first preset value and the second preset value.

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