A hot water system and control method of solar energy, heat pump and gas coupling

Abstract

The hot water system and control method of solar energy, heat pump and gas coupling provided by the present invention relate to the field of solar energy application technology, including a solar water heater system, a heat pump system and a processor; the solar water heater system includes a solar heat collecting tube, a solar heat collecting tank, a circulating water pump, a solar radiation detection device, a first electric control valve, a second electric control valve, a third electric control valve, a fourth electric control valve and a first temperature detection device; the heat pump system includes a condenser, an evaporator, a compressor, a heat pump coil, a fifth electric control valve, a sixth electric control valve and a second temperature detection device, and the heat pump system absorbs solar heat by installing the heat pump coil in the solar heat collecting tube; the present invention adopts a solar radiation detection device and a temperature detection device to monitor changes in climate conditions, so as to control the electric control valve to change the flow direction of water and refrigerant, start different operation modes, and improve the energy application efficiency of the system.

Description

Technical Field

[0001] The invention relates to the technical field of solar energy application, and in particular to a hot water system coupled with solar energy, a heat pump and gas and a control method. Background Art

[0002] Solar energy is a clean renewable energy source with the characteristics of abundant resources and no mining costs. The application of solar heat pump systems has many benefits for society. Solar heat pumps have the advantages of not only absorbing solar energy but also absorbing energy in the air, which is both environmentally friendly and energy-saving. However, due to the inherent instability, dispersion, and seasonality of solar energy resources, the hot water directly heated by solar energy for daily use fluctuates greatly and cannot even be used in extremely cold or rainy weather. In the prior art, a solar water heating system is a system that uses solar collectors to collect solar radiation energy and prepare and provide hot water for users. Since solar radiation energy has a low density, is unstable, and is not manually controllable, solar water heating systems are usually equipped with a hot water storage tank regardless of the size of the system. In order to ensure the reliability of providing hot water volume and temperature, it is usually equipped with an auxiliary heating device that converts electrical energy into thermal energy, and has low thermal efficiency.

[0003] Heat pumps are a type of reverse cycle, and are highly efficient, especially under small temperature differences, but extreme weather has a significant impact on heat pumps. In the prior art, solar water heating systems and heat pump water heating systems exist independently, in series or in parallel. Combining the characteristics of solar energy and heat pumps, heat pumps and solar water heating systems can be used in combination, and the heat recovered from the solar water storage tank can be used to heat hot water through heat pumps, thereby improving the efficiency of the combined system. Although traditional solar water heaters and heat pump water heaters have been used in combination, the efficiency of switching heat sources is low and the thermal stability is poor. Summary of the invention

[0004] The purpose of the present invention is to provide a hot water system and control method coupled with solar energy, heat pump and gas. Compared with the independent solar water heater system and heat pump system in the prior art, the heat pump coil of the heat pump system is coupled with the solar collector tube. When the entire coupled system is working, the heat pump coil directly absorbs the solar radiation heat and also absorbs the heat of the hot water heated by the solar energy in the collector tube, thereby providing stable thermal performance and improving the efficiency of the hot water system.

[0005] To achieve the above-mentioned object, the present invention proposes the following technical solution: a solar energy, heat pump and gas coupled hot water system, comprising a solar water heater system, a heat pump system and a processor;

[0006] The solar water heater system comprises a solar heat collecting tube, a solar heat collecting tank, a circulating water pump, a solar radiation detection device, a first electrically controlled valve, a second electrically controlled valve, a third electrically controlled valve, a fourth electrically controlled valve and a first temperature detection device, wherein the solar radiation detection device is used to measure the solar radiation amount a, and the first temperature detection device is used to measure the water temperature t1 at the outlet of the solar heat collecting tank;

[0007] The heat pump system comprises a condenser, an evaporator, a compressor, a heat pump coil, a fifth electrically controlled valve, a sixth electrically controlled valve and a second temperature detection device, wherein the heat pump coil is installed in a solar heat collecting tube, and the second temperature detection device is used to measure the water temperature t2 at the condenser outlet;

[0008] The first route of the water supply pipeline is connected from the water supply pipeline inlet through the first electric control valve, the solar heat collection pipe and the circulating water pump to the solar heat collection tank, and the water outlet of the solar heat collection tank is connected to the water supply pipeline outlet through the fourth electric control valve; the second route of the water supply pipeline is connected from the water supply pipeline inlet through the second electric control valve and the condenser outlet to the water supply pipeline outlet; the third route of the water supply pipeline is connected from the water supply pipeline inlet through the third electric control valve to the solar heat collection tank;

[0009] The first path of the refrigerant pipeline is connected from the refrigerant outlet of the condenser through the fifth electric control valve, the heat pump coil and the compressor to the refrigerant inlet of the condenser; the second path of the refrigerant pipeline is connected from the refrigerant outlet of the condenser through the sixth electric control valve, the evaporator and the compressor to the refrigerant inlet of the condenser;

[0010] The processor is preset with a solar radiation critical value A, a solar water tank outlet water temperature critical value T1 and a condenser outlet water temperature critical value T2. The processor responds to the comparison results of the measured values ​​of the solar radiation detection device, the first temperature detection device and the second temperature detection device with their corresponding critical values, and controls the opening or closing of the first electrically controlled valve, the second electrically controlled valve, the third electrically controlled valve, the fourth electrically controlled valve, the fifth electrically controlled valve and the sixth electrically controlled valve respectively, thereby starting different operating modes of the hot water system.

[0011] Further, the hot water system includes operation mode 1, operation mode 2, operation mode 3 and operation mode 4;

[0012] The operation mode 1 is that the solar water heater system operates independently, specifically: when a>A, t1>T1, the first and fourth electronically controlled valves are opened, the second, third, fifth and sixth electronically controlled valves are closed, and the solar water heater system operates independently;

[0013] The second operation mode is that the solar water heater system and the heat pump system operate alternately, specifically: when a>A, t1<T1, t2>T2, the solar water heater system and the heat pump system operate alternately, the first electronically controlled valve, the second electronically controlled valve, and the sixth electronically controlled valve are opened, and the third electronically controlled valve, the fourth electronically controlled valve, and the fifth electronically controlled valve are closed; when a>A, t1>T1, t2<T2, the first electronically controlled valve, the fourth electronically controlled valve, and the sixth electronically controlled valve are opened, and the second electronically controlled valve, the third electronically controlled valve, and the fifth electronically controlled valve are closed;

[0014] The operation mode three is that the solar water heater system and the heat pump system operate simultaneously, specifically: when 0<a<A, t1<T1, the solar water heater system and the heat pump system operate simultaneously, the first electronically controlled valve, the second electronically controlled valve, the third electronically controlled valve, and the fifth electronically controlled valve are opened, and the fourth electronically controlled valve and the sixth electronically controlled valve are closed;

[0015] The operation mode four is the independent operation of the heat pump system, specifically: when a=0, t2<T2, the heat pump system operates independently, the second electronically controlled valve and the sixth electronically controlled valve are opened, and the first electronically controlled valve, the third electronically controlled valve, the fourth electronically controlled valve and the fifth electronically controlled valve are closed.

[0016] Furthermore, a gas water heater is provided at the outlet of the water supply pipe, and the gas water heater is used to assist in heating low-temperature hot water when the outlet water temperature of the hot water system is required to be higher; the processor is preset with a water supply pipe outlet water temperature critical value T3 for starting the gas water heater; when the water supply pipe outlet water temperature set by the hot water system is higher than or equal to the water supply pipe outlet water temperature critical value T3, the gas water heater starts.

[0017] Furthermore, a throttling device, such as a throttling valve, is provided between the refrigerant pipeline from the refrigerant outlet of the condenser to the fifth electrically-controlled valve or the sixth electrically-controlled valve.

[0018] Furthermore, in the heat pump system, the condenser is a water box type condenser, and the evaporator is an air-cooled evaporator.

[0019] The present invention also discloses a control method for the above-mentioned solar energy, heat pump and gas coupled hot water system, which specifically includes the following control methods for the operation modes:

[0020] Operation mode 1: Solar water heater system operates independently

[0021] When a>A, t1>T1, the processor controls the first and fourth electronically controlled valves to open, the second, third, fifth and sixth electronically controlled valves to close, and the solar water heater system operates independently; the water at the inlet of the water supply pipe flows to the solar collector tube through the first electronically controlled valve, and is transported to the solar collector tank for storage through the circulating water pump after absorbing solar radiation and heating in the solar collector tube, and the hot water in the solar collector tank flows to the outlet of the water supply pipe through the fourth electronically controlled valve for user use. That is, when the amount of solar radiation is sufficient, the temperature of the hot water absorbing solar radiation energy and heating can meet the user's temperature requirements for the hot water system.

[0022] Operation mode 2: Solar water heater system and heat pump system operate alternately

[0023] When a>A, t1<T1, t2>T2, the processor controls the first electric control valve, the second electric control valve, and the sixth electric control valve to open, and the third electric control valve, the fourth electric control valve, and the fifth electric control valve to close; the solar water heater system and the heat pump system operate alternately; the water at the inlet of the water supply pipe flows to the condenser through the second electric control valve, and after heat exchange with the high-temperature refrigerant gas in the condenser and heating up, flows to the outlet of the water supply pipe for user use, and after heat exchange, the refrigerant liquid flows from the refrigerant outlet of the condenser through the sixth electric control valve in turn to the evaporator and the compressor, and circulates to the condenser; the water at the inlet of the water supply pipe flows to the evaporator and the compressor through the sixth electric control valve in turn .... It flows to the solar collector tube through the first electrically controlled valve, absorbs solar radiation and heats up in the solar collector tube, and is transported to the solar heat collection tank for storage through a circulating water pump until a>A, t1>T1, t2<T2, at which time the processor controls the fourth electrically controlled valve to open and the second electrically controlled valve to close, and the hot water in the solar heat collection tank flows to the water supply pipe outlet through the fourth electrically controlled valve for user use; Operation mode 2 is used when there is sufficient solar radiation, but the temperature of the temporary water outlet at the bottom of the solar heat collection tank cannot meet user requirements due to the user's water consumption. At this time, the solar collector and the heat pump system are started alternately.

[0024] Operation mode 3: Solar water heater system and heat pump system operate simultaneously

[0025] When 0<a<A, t1<T1, the processor controls the first electrically controlled valve, the second electrically controlled valve, the third electrically controlled valve, and the fifth electrically controlled valve to be opened, and the fourth electrically controlled valve and the sixth electrically controlled valve to be closed, and the solar water heater system and the heat pump system operate simultaneously; the water at the inlet of the water supply pipe flows to the solar collector tube through the first electrically controlled valve, and is transported to the solar collector water tank through the circulating water pump after absorbing solar radiation and heating in the solar collector tube, and the hot water in the solar collector water tank is circulated to the solar collector tube through the third electrically controlled valve for cyclic heating, The hot water after circulating heating flows to the outlet of the water supply pipe through the fourth electric control valve for user use; the water at the inlet of the water supply pipe flows to the condenser through the second electric control valve, and after heat exchange with the high-temperature refrigerant gas in the condenser and heating up, flows to the outlet of the water supply pipe for user use. After heat exchange, the refrigerant liquid flows from the refrigerant outlet of the condenser through the fifth electric control valve to the heat pump coil arranged in the solar collector tube in sequence. The refrigerant liquid absorbs the heat of the hot water in the solar collector tube and evaporates. After evaporation, the refrigerant gas is compressed by the compressor and heated up and circulated to the condenser. Operation mode three is used when the solar radiation energy is low on cloudy days or in autumn and winter, and the solar radiation cannot heat the hot water to the hot water temperature required by the user.

[0026] Operation mode 4: heat pump system independent operation

[0027] When a=0, t2<T2, the processor controls the second and sixth electronically controlled valves to open, the first, third, fourth and fifth electronically controlled valves to close, and the heat pump system operates independently; the water at the inlet of the water supply pipe flows to the condenser through the second electronically controlled valve, and after heat exchange with the high-temperature refrigerant gas in the condenser and heating up, flows to the outlet of the water supply pipe for user use. After heat exchange, the refrigerant liquid flows from the refrigerant outlet of the condenser through the sixth electronically controlled valve to the evaporator and the compressor in turn, and then circulates to the condenser. When the sunlight is completely blocked, that is, at night, there is no solar radiation, and the hot water system directly operates in mode four.

[0028] Furthermore, the water supply pipe outlet is provided with a gas water heater for auxiliary heating; the processor presets a water supply pipe outlet water temperature critical value T3 for starting the gas water heater; when the water supply pipe outlet water temperature set by the hot water system is higher than or equal to the water supply pipe outlet water temperature critical value T3, the processor controls the start of the gas water heater.

[0029] Furthermore, the solar radiation detection device is a solar radiation measuring instrument; the first temperature detection device and the second temperature detection device are both temperature sensors.

[0030] Furthermore, the second operation mode also includes when a>A, t1<T1, t2<T2, the processor controls to start the gas water heater for auxiliary heating.

[0031] It can be seen from the above technical solutions that the hot water system and control method coupled with solar energy, heat pump and gas provided by the technical solution of the present invention have the following beneficial effects:

[0032] The hot water system and control method of solar energy, heat pump and gas coupling provided by the present invention relate to the field of solar energy application technology, including a solar water heater system, a heat pump system and a processor; the solar water heater system includes a solar heat collecting tube, a solar heat collecting tank, a circulating water pump, a solar radiation detection device, a first electrically controlled valve, a second electrically controlled valve, a third electrically controlled valve, a fourth electrically controlled valve and a first temperature detection device; the heat pump system includes a condenser, an evaporator, a compressor, a heat pump coil, a fifth electrically controlled valve, a sixth electrically controlled valve and a second temperature detection device, and the heat pump system absorbs solar heat by installing the heat pump coil in the solar heat collecting tube; the present invention adopts a solar radiation detection device and a temperature detection device to monitor changes in climate conditions so as to control the electrically controlled valve to change the flow direction of water and refrigerant and start different operating modes.

[0033] The present invention couples the heat pump coil of the heat pump system with the solar collector tube of the solar water heater system. When the coupled systems work synchronously, the heat pump coil directly absorbs the solar radiation heat and also absorbs the heat of the hot water heated by the solar energy in the solar collector tube, thereby providing stable thermal performance, improving the energy application efficiency of the hot water system, saving conventional energy consumption, and generating greater economic and social benefits.

[0034] It should be appreciated that all combinations of the foregoing concepts, as well as additional concepts described in greater detail below, may be considered to be part of the inventive subject matter of the present disclosure, provided such concepts are not mutually inconsistent.

[0035] The foregoing and other aspects, embodiments and features of the present invention can be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as the features and / or beneficial effects of the exemplary embodiments, will be apparent from the following description or learned from the practice of the specific embodiments according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in various figures may be represented by the same reference numeral. For clarity, not every component is labeled in every figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, in which:

[0037] Figure 1 The circuit diagram of the hot water system of the present invention which is coupled with solar energy, heat pump and gas;

[0038] Figure 2This is a flow chart of the control method of the hot water system coupled with solar energy, heat pump and gas according to the present invention.

[0039] In the figure, the specific meaning of each mark is as follows:

[0040] 1- water supply pipe inlet, 2- solar energy heat collecting pipe, 3- circulating water pump, 4- solar energy heat collecting tank, 5- water supply pipe outlet, 6- condenser, 7- compressor, 8- throttling device, 9- heat pump coil, 10- evaporator, 11- gas water heater. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be the common meaning understood by people with general skills in the field to which the present invention belongs.

[0042] The words "first", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular form of "a", "an" or "the" and other similar words do not indicate a quantitative limitation, but indicate the existence of at least one. "Include" or "comprises" and other similar words mean that the elements or objects appearing before "include" or "comprises" include the features, wholes, steps, operations, elements and / or components listed after "include" or "comprises", and do not exclude the existence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections.

[0043] The solar energy, heat pump and gas coupled hot water system and control method of the present invention will be further specifically introduced below in conjunction with the accompanying drawings.

[0044] The hot water system of solar energy, heat pump and gas coupling of the present invention comprises a solar water heater system, a heat pump system and a processor; wherein the solar water heater system comprises a solar heat collecting tube 2, a solar heat collecting tank 4, a circulating water pump 3, a solar radiation detection device, a first electrically controlled valve S1, a second electrically controlled valve S2, a third electrically controlled valve S3, a fourth electrically controlled valve S4 and a first temperature detection device, wherein the solar radiation detection device is used to measure the solar radiation amount a, and the first temperature detection device is used to measure the water temperature t1 at the outlet of the solar heat collecting tank 4; the heat pump system comprises a condenser 6, an evaporator 10, a compressor 7, a heat pump coil 9, a fifth electrically controlled valve S5, a sixth electrically controlled valve S6 and a second temperature detection device, wherein the second temperature detection device is used to measure the water temperature t2 at the outlet of the condenser 6; the heat pump coil 9 is installed in the solar heat collecting tube 2 to realize the coupling of the heat pump coil 9 in the heat pump system and the solar heat collecting tube 2 in the solar water heater system. Therefore, when the coupled system works synchronously, the heat pump coil 9 directly absorbs the solar radiation heat while also absorbing the heat of the hot water heated by solar energy in the solar collector tube 2, effectively improving the energy application efficiency of the hot water system and enabling the hot water system to provide stable thermal performance.

[0045] Combination Figure 1 As shown, the hot water system of the present invention includes a water supply pipeline and a refrigerant pipeline, and the connection relationship of the pipelines is as follows. The first route of the water supply pipeline is connected from the water supply pipeline inlet 1 through the first electric control valve S1, the solar heat collection pipe 2 and the circulating water pump 3 to the solar heat collection tank 4, and the water outlet of the solar heat collection tank 4 is connected to the water supply pipeline outlet 5 through the fourth electric control valve S4; the second route of the water supply pipeline is connected from the water supply pipeline inlet 1 through the second electric control valve S2 and the water outlet of the condenser 6 to the water supply pipeline outlet 5; the third route of the water supply pipeline is connected from the water supply pipeline inlet 1 through the third electric control valve S3 to the solar heat collection tank 4; the first route of the refrigerant pipeline is connected from the refrigerant outlet of the condenser 6 through the fifth electric control valve S5, the heat pump coil 9 and the compressor 7 to the refrigerant inlet of the condenser 6; the second route of the refrigerant pipeline is connected from the refrigerant outlet of the condenser 6 through the sixth electric control valve S6, the evaporator 10 and the compressor 7 to the refrigerant inlet of the condenser 6. In the embodiment shown in the drawings, a throttling device 8 is provided between the refrigerant outlet of the condenser 6 and the fifth electrically controlled valve S5 or the sixth electrically controlled valve S6 in the refrigerant pipeline, and the throttling device 8 is a throttling valve.

[0046] The processor controls the operating mode of the hot water system. Specifically, the processor is preset with a solar radiation critical value A, a water temperature critical value T1 at the water outlet of the solar water collection tank 4, and a water temperature critical value T2 at the water outlet of the condenser 6. The processor responds to the comparison results of the measured values ​​of the solar radiation detection device, the first temperature detection device, and the second temperature detection device with their corresponding critical values, and controls the opening or closing of the first electrically controlled valve S1, the second electrically controlled valve S2, the third electrically controlled valve S3, the fourth electrically controlled valve S4, the fifth electrically controlled valve S5, and the sixth electrically controlled valve S6 respectively, connects different water supply pipeline loops and refrigerant pipeline loops, and starts different operating modes of the hot water system.

[0047] The hot water system includes operation mode 1, operation mode 2, operation mode 3 and operation mode 4; the operation mode 1 is that the solar water heater system operates independently, specifically: when a>A, t1>T1, the first electrically controlled valve S1 and the fourth electrically controlled valve S4 are opened, the second electrically controlled valve S2, the third electrically controlled valve S3, the fifth electrically controlled valve S5 and the sixth electrically controlled valve S6 are closed, and the solar water heater system operates independently; the operation mode 2 is that the solar water heater system and the heat pump system operate alternately, specifically: when a>A, t1<T1, t2>T2, the solar water heater system and the heat pump system operate alternately, the first electrically controlled valve, the second electrically controlled valve and the sixth electrically controlled valve are opened, the third electrically controlled valve, the fourth electrically controlled valve and the fifth electrically controlled valve are closed; when a>A, t1>T1, t2<T2 , the first electrically controlled valve, the fourth electrically controlled valve, and the sixth electrically controlled valve are opened, and the second electrically controlled valve, the third electrically controlled valve, and the fifth electrically controlled valve are closed; the operation mode three is that the solar water heater system and the heat pump system operate simultaneously, specifically: when 0<a<A, t1<T1, the solar water heater system and the heat pump system operate simultaneously, the first electrically controlled valve S1, the second electrically controlled valve S2, the third electrically controlled valve S3, and the fifth electrically controlled valve S5 are opened, and the fourth electrically controlled valve S4 and the sixth electrically controlled valve S6 are closed; the operation mode four is that the heat pump system operates independently, specifically: when a=0, t2<T2, the heat pump system operates independently, the second electrically controlled valve S2 and the sixth electrically controlled valve S6 are opened, and the first electrically controlled valve S1, the third electrically controlled valve S3, the fourth electrically controlled valve S4 and the fifth electrically controlled valve S5 are closed.

[0048] Further integration Figure 1As shown, the water supply pipe outlet 5 is also provided with a gas water heater 11, and the gas water heater 11 is used for auxiliary heating when the solar water heater system and the heat pump system cannot reach the water outlet temperature set by the hot water system in any operation mode. Specifically, the processor presets a critical value T3 of the water temperature at the water supply pipe outlet for starting the gas water heater 11, and when the water temperature at the water supply pipe outlet set by the hot water system is higher than or equal to the critical value T3 of the water temperature at the water supply pipe outlet, the gas water heater 11 is started. The gas water heater 11 is also used in another scenario, when the solar radiation is sufficient, but the user uses a large amount of water, the solar water heater system and the heat pump system are not enough to support the water temperature to rise to the set temperature of the hot water system immediately, that is, a>A, t1<T1, t2<T2, at this time, the gas water heater 11 is also controlled to start auxiliary heating of hot water, so as to reach the set temperature of the hot water system and continuously supply a large amount of hot water to the user.

[0049] In this embodiment, the condenser 6 of the heat pump system uses a water box condenser, and the evaporator 10 uses an air-cooled evaporator. The embodiment discloses a specific installation structure for implementing the technical solution of the present invention, but the installation structure in the technical solution of the present invention is not limited to the water box condenser and / or air-cooled evaporator disclosed in the embodiment, and other structures of the condenser 6 and evaporator 10 may also be used.

[0050] Combination Figure 2 As shown in the flowchart of the control method of the hot water system coupled with solar energy, heat pump and gas of the present invention, it can be known that the control method of the present invention controls the opening or closing of six electrically controlled valves according to the comparison results of the measured values ​​of the solar radiation detection device, the first temperature detection device and the second temperature detection device with the corresponding critical values ​​preset by the processor, so as to change the flow direction of water and refrigerant, connect different water supply pipes and refrigerant pipes, and start the control process of different operation modes.

[0051] First, the solar radiation detection device measures the solar radiation a in real time, such as once every hour or based on the local solar radiation data, which can be used to judge the current climate; secondly, the specific data of the water temperature t1 at the outlet of the solar water collection tank 4 and the water temperature t2 at the outlet of the condenser 6 are obtained in real time, and the data a, t1 and t2 are compared with the solar radiation critical value A, the solar water collection tank 4 outlet water temperature critical value T1, and the condenser 6 outlet water temperature critical value T2 respectively; finally, according to the data comparison results, the operating mode that meets the current conditions is selected from the four operating modes to supply hot water. The four operating modes of the hot water system are introduced below.

[0052] Operation mode 1: Solar water heater system operates independently

[0053] When a>A, t1>T1, when the solar radiation is sufficient, the temperature of the hot water absorbed by the solar radiation energy can meet the user's temperature demand for the hot water system, the processor controls the first electrically controlled valve S1 and the fourth electrically controlled valve S4 to open, and the second electrically controlled valve S2, the third electrically controlled valve S3, the fifth electrically controlled valve S5 and the sixth electrically controlled valve S6 to close, and the solar water heater system operates independently; the water at the water supply pipe inlet 1 flows to the solar collector tube 2 through the first electrically controlled valve S1, and after absorbing solar radiation and heating in the solar collector tube 2, it is transported to the solar collector tank 4 for storage through the circulating water pump 3, and the hot water in the solar collector tank 4 flows to the water supply pipe outlet 5 through the fourth electrically controlled valve S4 for user use.

[0054] Operation mode 2: Solar water heater system and heat pump system operate alternately

[0055] When a>A, t1<T1, t2>T2, although the solar radiation is sufficient, the user's water consumption is roughly such that the temperature of the temporary water outlet at the bottom of the solar water collection tank 4 cannot meet the user's needs. The processor controls the first electrically controlled valve S1, the second electrically controlled valve S2, and the sixth electrically controlled valve S6 to open, and the third electrically controlled valve S3, the fourth electrically controlled valve S4 and the fifth electrically controlled valve S5 to close, and the solar water heater system and the heat pump system operate alternately; the water at the water supply pipe inlet 1 flows to the condenser 6 through the second electrically controlled valve S2, and after heat exchange with the high-temperature refrigerant gas in the condenser 6 and temperature rises, it flows to the water supply pipe outlet 5 for user use. After heat exchange, the refrigerant liquid flows from the refrigerant outlet of the condenser 6 through the sixth electrically controlled valve S6 to the evaporator 10 and the compressor 7 in sequence for recycling. To the condenser 6; the water at the water supply pipe inlet 1 flows to the solar collector tube 2 through the first electric control valve S1 in another way, and after absorbing solar radiation and heating up in the solar collector tube 2, it is transported to the solar water collection tank 4 for storage through the circulating water pump 3 until a>A, t1>T1, t2<T2, the processor controls the first electric control valve S1, the fourth electric control valve S4, and the sixth electric control valve S6 to open, the second electric control valve S2, the third electric control valve S3 and the fifth electric control valve S5 to close, and the hot water in the solar water collection tank 4 flows to the water supply pipe outlet 5 through the fourth electric control valve S4 for user use; that is, when the solar water heater system is heated, the heat pump system is used to supply hot water until the water temperature of the solar water heater system is sufficient, the heat pump system is turned off, and the solar water heater system is re-supplied with water, and the water is used alternately in a cycle.

[0056] Operation mode 3: Solar water heater system and heat pump system operate simultaneously

[0057] When 0<a<A, t1<T1, on cloudy days or in autumn and winter when the solar radiation energy is low, the solar radiation cannot heat the hot water to the hot water temperature required by the user, the processor controls the first electrically controlled valve S1, the second electrically controlled valve S2, the third electrically controlled valve S3, the fifth electrically controlled valve S5 to open, the fourth electrically controlled valve S4 and the sixth electrically controlled valve S6 to close, and the solar water heater system and the heat pump system operate simultaneously; the water at the water supply pipe inlet 1 flows through the first electrically controlled valve S1 to the solar collector tube 2, absorbs solar radiation in the solar collector tube 2 and heats up, and is transported to the solar collector tank 4 through the circulating water pump 3, and the hot water in the solar collector tank 4 is transported to the solar collector tank 4 through the third electrically controlled valve S1. Valve S3 circulates to the solar energy heat collecting tube 2 for circulated heating, and the hot water after circulated heating flows to the water supply pipe outlet 5 through the fourth electrically-controlled valve S4 for user use; the water at the water supply pipe inlet 1 flows to the condenser 6 through the second electrically-controlled valve S2 in another way, and exchanges heat with the high-temperature refrigerant gas in the condenser 6 to heat up and flows to the water supply pipe outlet 5 for user use. After the heat exchange, the refrigerant liquid flows from the refrigerant outlet of the condenser 6 through the fifth electrically-controlled valve S5 in sequence to the heat pump coil 9 arranged in the solar energy heat collecting tube 2, and the refrigerant liquid absorbs the solar radiation heat and the hot water heat in the solar energy heat collecting tube 2 and then evaporates. After evaporation, the refrigerant gas is compressed and heated by the compressor 7 and circulated to the condenser 6.

[0058] Operation mode 4: heat pump system independent operation

[0059] When a=0, t2<T2, the sunlight is completely blocked, and it is nighttime with no solar radiation. The processor controls the second electrically-controlled valve S2 and the sixth electrically-controlled valve S6 to open, and the first electrically-controlled valve S1, the third electrically-controlled valve S3, the fourth electrically-controlled valve S4 and the fifth electrically-controlled valve S5 to close, and the heat pump system operates independently; the water at the water supply pipe inlet 1 flows to the condenser 6 through the second electrically-controlled valve S2, and after heat exchange with the high-temperature refrigerant gas in the condenser 6 and temperature rises, it flows to the water supply pipe outlet 5 for user use. After heat exchange, the refrigerant liquid flows from the refrigerant outlet of the condenser 6 through the sixth electrically-controlled valve S6 to the evaporator 10 and the compressor 7 in sequence, and changes into a high-temperature refrigerant gas and recirculates to the condenser 6.

[0060] In order to ensure that the hot water system can always provide hot water at the temperature set by the user, the control method also includes a gas water heater 11 for auxiliary heating at the water supply pipe outlet 5, and the processor presets a water supply pipe outlet water temperature critical value T3 for starting the gas water heater 11. When the water temperature at the water supply pipe outlet set by the hot water system is higher than or equal to the water supply pipe outlet water temperature critical value T3, the processor controls to start the gas water heater 11. Generally, the water supply pipe outlet water temperature critical value T3 should exceed the highest temperature that the solar water heater system and the heat pump system in the hot water system can reach in any operating mode, that is, when the solar water heater system and the heat pump system cannot meet the user's needs, the control method starts the gas water heater 11 to assist in heating the hot water to the high temperature set by the user. For example, the water supply pipe outlet water temperature critical value T3 is set to 60°C. When the set water outlet temperature of the hot water system is greater than or equal to 60°C, the gas water heater 11 is directly started in any operating mode. In addition, the gas water heater 11 is also used in some emergency scenarios. For example, in operation mode 2, when a>A, t1<T1, t2<T2, the user uses a large amount of water, making the solar water heater system and the heat pump system insufficient to support the water temperature to be raised to the user-set temperature immediately. At this time, the gas water heater starts to assist in heating the hot water until the temperature required by the user is reached for user use.

[0061] In the present invention, the solar radiation detection device for measuring the solar radiation amount a is a solar radiation measuring instrument, and the first temperature detection device for measuring the water temperature t1 at the water outlet of the solar water collection tank 4 and the second temperature detection device for measuring the water temperature t2 at the water outlet of the condenser 6 are both temperature sensors. The solar radiation detection device and the temperature detection device in the technical solution of the present invention are not limited to the solar radiation measuring instrument and the temperature sensor indicated in the specification, and other measuring devices may also be selected, which should also be included in the scope disclosed in the technical solution of the present invention.

[0062] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. A hot water system coupled with solar energy, heat pump and gas, characterized in that: Includes solar water heater systems, heat pump systems and processors; The solar water heater system comprises a solar heat collecting tube, a solar heat collecting tank, a circulating water pump, a solar radiation detection device, a first electrically controlled valve, a second electrically controlled valve, a third electrically controlled valve, a fourth electrically controlled valve and a first temperature detection device, wherein the solar radiation detection device is used to measure the solar radiation amount a, and the first temperature detection device is used to measure the water temperature t1 at the outlet of the solar heat collecting tank; The heat pump system comprises a condenser, an evaporator, a compressor, a heat pump coil, a fifth electrically controlled valve, a sixth electrically controlled valve and a second temperature detection device, wherein the heat pump coil is installed in a solar heat collecting tube, and the second temperature detection device is used to measure the water temperature t2 at the condenser outlet; The hot water system coupled with solar energy, heat pump and gas comprises a water supply pipeline and a refrigerant pipeline, the outlet of the water supply pipeline is provided with a gas water heater, and the gas water heater is used for auxiliary heating; the first route of the water supply pipeline is connected from the water supply pipeline inlet through the first electric control valve, the solar heat collecting pipe and the circulating water pump to the solar heat collecting tank, and the water outlet of the solar heat collecting tank is connected to the water supply pipeline outlet through the fourth electric control valve; the second route of the water supply pipeline is connected from the water supply pipeline inlet through the second electric control valve and the condenser outlet to the water supply pipeline outlet; the third route of the water supply pipeline is connected from the water supply pipeline inlet through the third electric control valve to the solar heat collecting tank; The first path of the refrigerant pipeline is connected from the refrigerant outlet of the condenser through the fifth electric control valve, the heat pump coil and the compressor to the refrigerant inlet of the condenser; the second path of the refrigerant pipeline is connected from the refrigerant outlet of the condenser through the sixth electric control valve, the evaporator and the compressor to the refrigerant inlet of the condenser; The processor is preset with a solar radiation critical value A, a solar water collection tank outlet water temperature critical value T1, and a condenser outlet water temperature critical value T2. The processor responds to the comparison result of the measured values ​​of the solar radiation detection device, the first temperature detection device, and the second temperature detection device with their corresponding critical values, and controls the opening or closing of the first electric control valve, the second electric control valve, the third electric control valve, the fourth electric control valve, the fifth electric control valve, and the sixth electric control valve, respectively, to start different operation modes of the hot water system; The hot water system includes operation mode 1, operation mode 2, operation mode 3 and operation mode 4; The operation mode 1 is that the solar water heater system operates independently, specifically: when a>A, t1>T1, the first electronically controlled valve and the fourth electronically controlled valve are opened, and the second electronically controlled valve, the third electronically controlled valve, the fifth electronically controlled valve and the sixth electronically controlled valve are closed; The second operation mode is that the solar water heater system and the heat pump system operate alternately, specifically: when a>A, t1<T1, t2>T2, the first electronically controlled valve, the second electronically controlled valve, and the sixth electronically controlled valve are opened, and the third electronically controlled valve, the fourth electronically controlled valve, and the fifth electronically controlled valve are closed; when a>A, t1>T1, t2<T2, the first electronically controlled valve, the fourth electronically controlled valve, and the sixth electronically controlled valve are opened, and the second electronically controlled valve, the third electronically controlled valve, and the fifth electronically controlled valve are closed; The operation mode three is that the solar water heater system and the heat pump system operate simultaneously, specifically: when 0<a<A, t1<T1, the first electrically controlled valve, the second electrically controlled valve, the third electrically controlled valve, and the fifth electrically controlled valve are opened, and the fourth electrically controlled valve and the sixth electrically controlled valve are closed; The operation mode 4 is the independent operation of the heat pump system, specifically: when a=0, t2<T2, the second electronically controlled valve and the sixth electronically controlled valve are opened, and the first electronically controlled valve, the third electronically controlled valve, the fourth electronically controlled valve and the fifth electronically controlled valve are closed.

2. The solar energy, heat pump and gas coupled hot water system according to claim 1, characterized in that: The refrigerant pipeline is provided with a throttling device between the refrigerant outlet of the condenser and the fifth electrically controlled valve or the sixth electrically controlled valve.

3. The solar energy, heat pump and gas coupled hot water system according to claim 1, characterized in that: In the heat pump system, the condenser is a water box type condenser, and the evaporator is an air-cooled evaporator.

4. The solar energy, heat pump and gas coupled hot water system according to claim 1, characterized in that: The processor is preset with a critical value T3 of the water temperature at the outlet of the water supply pipe for starting the gas water heater; When the water temperature at the water supply pipe outlet set by the hot water system is higher than or equal to the water supply pipe outlet water temperature critical value T3, the gas water heater starts.

5. The control method of the hot water system coupled with solar energy, heat pump and gas according to claim 1, characterized in that: The control method of the following operating modes is included: Operation mode 1: Solar water heater system operates independently When a>A, t1>T1, the processor controls the first and fourth electronically controlled valves to open, and the second, third, fifth and sixth electronically controlled valves to close, and the solar water heater system operates independently; the water at the inlet of the water supply pipe flows to the solar heat collecting tube through the first electronically controlled valve, and after absorbing solar radiation and heating in the solar heat collecting tube, it is transported to the solar heat collecting tank for storage through the circulating water pump, and the hot water in the solar heat collecting tank flows to the outlet of the water supply pipe through the fourth electronically controlled valve for user use; Operation mode 2: Solar water heater system and heat pump system operate alternately When a>A, t1<T1, t2>T2, the processor controls the first electronically controlled valve, the second electronically controlled valve, and the sixth electronically controlled valve to be opened, and the third electronically controlled valve, the fourth electronically controlled valve, and the fifth electronically controlled valve to be closed; the solar water heater system and the heat pump system operate alternately; the water at the inlet of the water supply pipe flows to the condenser through the second electronically controlled valve, and after heat exchange with the high-temperature refrigerant gas in the condenser and temperature rises, it flows to the outlet of the water supply pipe for user use, and after heat exchange, the refrigerant liquid flows from the refrigerant outlet of the condenser through the sixth electronically controlled valve in sequence to the evaporator and the compressor, and circulates to the condenser; the water at the inlet of the water supply pipe flows to the solar heat collecting tube through the first electronically controlled valve in another way, and after absorbing solar radiation and temperature rises in the solar heat collecting tube, it is transported to the solar heat collecting tank for storage through the circulating water pump, until when a>A, t1>T1, t2<T2, the processor controls the fourth electronically controlled valve to be opened, the second electronically controlled valve to be closed, and the hot water in the solar heat collecting tank flows to the outlet of the water supply pipe through the fourth electronically controlled valve for user use; Operation mode 3: Solar water heater system and heat pump system operate simultaneously When 0<a<A, t1<T1, the processor controls the first electrically controlled valve, the second electrically controlled valve, the third electrically controlled valve, and the fifth electrically controlled valve to be opened, and the fourth electrically controlled valve and the sixth electrically controlled valve to be closed, and the solar water heater system and the heat pump system operate simultaneously; the water at the inlet of the water supply pipe flows to the solar collector tube through the first electrically controlled valve, and is transported to the solar collector water tank through the circulating water pump after absorbing solar radiation and heating in the solar collector tube, and the hot water in the solar collector water tank is circulated to the solar collector tube through the third electrically controlled valve for cyclic heating, The hot water after circulating heating flows to the outlet of the water supply pipe through the fourth electric control valve for user use; the water at the inlet of the water supply pipe flows to the condenser through the second electric control valve in another way, and exchanges heat with the high-temperature refrigerant gas in the condenser to increase the temperature before flowing to the outlet of the water supply pipe for user use; after the heat exchange, the refrigerant liquid flows from the refrigerant outlet of the condenser through the fifth electric control valve in sequence to the heat pump coil arranged in the solar heat collecting tube, and the refrigerant liquid absorbs the heat of the hot water in the solar heat collecting tube and evaporates, and the refrigerant gas after evaporation is compressed by the compressor to increase the temperature and circulate to the condenser; Operation mode 4: heat pump system independent operation When a=0, t2<T2, the processor controls the second electrically-controlled valve and the sixth electrically-controlled valve to open, and the first electrically-controlled valve, the third electrically-controlled valve, the fourth electrically-controlled valve and the fifth electrically-controlled valve to close, and the heat pump system operates independently; the water at the inlet of the water supply pipe flows to the condenser through the second electrically-controlled valve, and after heat exchange with the high-temperature refrigerant gas in the condenser and heating up, flows to the outlet of the water supply pipe for user use. After heat exchange, the refrigerant liquid flows from the refrigerant outlet of the condenser through the sixth electrically-controlled valve in sequence to the evaporator and the compressor, and then circulates to the condenser.

6. The control method of the hot water system coupled with solar energy, heat pump and gas according to claim 5, characterized in that: The outlet of the water supply pipe is provided with a gas water heater for auxiliary heating; the processor is preset with a critical value T3 of the water temperature at the outlet of the water supply pipe for starting the gas water heater; When the water temperature at the water supply pipe outlet set by the hot water system is higher than or equal to the water supply pipe outlet water temperature critical value T3, the processor controls the gas water heater to start.

7. The control method of the hot water system coupled with solar energy, heat pump and gas according to claim 5, characterized in that: The solar radiation detection device is a solar radiation measuring instrument, and the first temperature detection device and the second temperature detection device are both temperature sensors.

8. The control method of the hot water system coupled with solar energy, heat pump and gas according to claim 6, characterized in that: The second operation mode also includes when a>A, t1<T1, t2<T2, the processor controls to start the gas water heater for auxiliary heating.

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