CN103115389A - Solar energy combined type phase-change heat storage heating system - Google Patents

Abstract

The invention discloses a solar composite phase-change thermal storage heating system, which mainly includes a solar heat collector (1), an auxiliary heat source (2), a solar circulation pump (4), a phase-change thermal storage tank (5), Heating circulation pump (8), connected with water pipes, installed with valves for adjustment; solar collectors and auxiliary heat sources connected in series or in parallel; When the heater reaches the heating temperature, it will directly provide heating. When there is surplus heat, it can be stored in the phase change heat storage tank first, and then exchange heat with the heating return water when the solar radiation is insufficient; the present invention utilizes various pipelines, The combination of valves and the heat storage characteristics of large heat storage and stable temperature of the phase change heat storage material can solve the shortcoming of unstable solar radiation and shorten the time for opening the auxiliary heat source; the invention does not have a plate heat exchanger, which reduces investment and reduces The outlet water temperature of the solar collector is improved, which is energy-saving and environmentally friendly.

Description

Solar composite phase change heat storage heating system

technical field

The invention relates to solar heating technology, in particular to a solar composite phase change thermal storage heating system.

Background technique

As a renewable and clean energy, solar energy has been widely concerned by people. With the continuous deterioration of the environment, a low-carbon and green living environment has become a long-term goal of global sustainable development. According to the needs of the living environment, building heating is a high-energy-consuming industry that must be faced in many cold regions. A large amount of energy consumption has led to an increase in energy use year by year. From the initial coal heating to the gas and heat pump heating in recent years, all of them are completed under the premise of consuming a large amount of basic energy. Therefore, seeking a new heating method centered on energy conservation and environmental protection, and replacing traditional energy with clean renewable energy has become a new trend in modern building heating. Solar energy, as the most abundant and most potential energy resource in the world - the utilization technology of solar energy, has always attracted the attention of all countries in the world.

At present, solar energy technology has been greatly developed all over the world, but due to the instability and intermittent nature of solar energy, there will be residual heat that cannot be effectively used when the solar radiation is strong, and it cannot provide enough energy when the solar radiation is weak. Energy is used by buildings. However, most of the existing solar heat storage heating technologies cannot use solar heat collectors for direct heating, resulting in weak solar radiation in the morning and when the phase change heat storage tank cannot provide heating, the auxiliary heat source must be turned on all the time, so that the sun cannot be fully utilized. . Moreover, in the weather with weak solar radiation, the heat release temperature of the solar collector outlet and the phase change heat storage tank may always be lower than the heating temperature. At this time, only the auxiliary heat source can be used for heating, and the solar energy resources cannot be utilized at all. Therefore, these techniques are not conducive to saving energy.

This system is similar in structure to the previously published CN 101812590 A "solar heating system and its heating and hot water supply method", but the feature of this system is that it uses solar heat collectors to make hot water reach the heating temperature without sufficient heat storage. Directly supply heat to the end and use phase change heat storage materials to store heat, thereby reducing the opening time of the auxiliary heat source as much as possible, reducing the volume of the heat storage tank, thereby maximizing the use of solar energy for heating, and better realizing the utilization of renewable energy. CN 101812590 A "solar heating system and its heating and hot water supply method" uses more heat exchangers, resulting in higher heating temperature of solar heat collectors, and the efficiency of solar heat collectors increases with that of solar heat collectors. The temperature of the outlet heating decreases, the system omits the plate heat exchanger, which can reduce the outlet temperature of the solar collector, so the efficiency of the solar collector of this system will be relatively high.

Contents of the invention

Aiming at the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a heating method that uses solar energy as the main heat source, and the solar collector can directly provide heating, or can be combined with energy storage and auxiliary heat sources, which can be applied to various Solar composite phase change heat storage heating system for different buildings.

For this reason, the present invention adopts the following technical solutions: 1. The solar energy composite phase change heat storage heating system, including the solar heat collector mainly composed of the solar heat collector (1) and the heating terminal (9) for direct heating without heat storage Circulating heating circuit Ⅰ, including direct heating of solar collectors and heat storage circulating heating circuit Ⅱ, mainly composed of solar collectors (1), phase change heat storage tanks (5), and heating terminals (9), including mainly composed of solar collectors Heat collector (1), phase change heat storage tank (5), and heating terminal (9) are composed of solar energy and phase change heat storage tank in series heating cycle heating loop III, which mainly consists of phase change heat storage tank (5), heating The phase-change heat storage tank heating cycle heating circuit IV composed of the terminal (9) includes the auxiliary heat source heating cycle heating circuit V mainly composed of the auxiliary heat source (2) and the heating terminal (9), which is characterized in that:

A. The solar collector direct heating without heat storage circulation heating loop I includes solar collector (1), solar circulation pump (4), heating water supply pipe (6), heating return water pipe (7), heating circulation The pump (8) and the heating terminal (9) are connected by water pipes between each component;

B. The solar heat collector direct heating plus thermal storage circulation heating circuit II includes a solar heat collector (1), a solar circulation pump (4), a phase change heat storage tank (5), a heating water supply pipe (6), The heating return pipe (7), the heating circulation pump (8) and the heating terminal (9), all components are connected by water pipes;

C. The solar energy and phase-change thermal storage tanks connected in series for heating circulation heating circuit III include solar collectors (1), phase-change thermal storage tanks (5), solar circulation pumps (4), heating water supply pipes (6), The heating return pipe (7), the heating circulation pump (8) and the heating terminal (9), all components are connected by water pipes;

D. The phase change heat storage tank heating cycle heating circuit IV includes a phase change heat storage tank (5), a heating water supply pipe (6), a heating return water pipe (7), a heating circulation pump (8) and a heating terminal (9 ), each component is connected with water pipes;

E. The auxiliary heat source heating cycle heating circuit V includes auxiliary heat source (2), heating water supply pipe (6), heating return water pipe (7), heating circulation pump (8) and heating terminal (9), between each component water pipe connection;

F. The above-mentioned solar collector direct heating without heat storage circulating heating loop I, solar collector direct heating plus thermal storage circulating heating loop II, solar energy and phase change heat storage tank in series heating circulating heating loop III, phase change storage The hot box heating cycle heating circuit IV and the auxiliary heat source heating cycle heating circuit V operate alternately. The conversion between the heating circuits of each heating cycle is regulated by the valves on the pipeline; the pumps, valve electric control devices, temperature sensors and auxiliary heat source controls in the system are respectively electrically connected to the controller (10);

2. Solar composite phase change thermal storage heating system, including the solar collector direct heating non-thermal storage cycle heating loop I mainly composed of solar collector (1) and heating terminal (9), including the solar thermal collector Solar collector (1), phase change heat storage tank (5), and heating terminal (9) are composed of solar collector direct heating plus heat storage cycle heating circuit II, including mainly composed of solar heat collector (1), phase change heat storage Solar energy and phase-change heat storage box series heating cycle heating circuit III composed of box (5) and heating terminal (9), including phase-change heat storage box mainly composed of phase-change heat storage box (5) and heating terminal (9) Heating cycle heating loop IV, including auxiliary heat source heating cycle heating loop V mainly composed of auxiliary heat source (2) and heating terminal (9), including solar heat collector (1), solar circulation pump (4), phase change The heat storage box (5), the auxiliary heat source (2), and the heating terminal (9) are composed of solar energy and auxiliary heat source in series heating cycle heating circuit VI; it is characterized in that:

A. The solar collector direct heating without heat storage circulation heating loop I includes solar collector (1), solar circulation pump (4), heating water supply pipe (6), heating return water pipe (7), heating circulation The pump (8) and the heating terminal (9) are connected by water pipes between each component;

B. The solar heat collector direct heating plus thermal storage circulation heating circuit II includes a solar heat collector (1), a solar circulation pump (4), a phase change heat storage tank (5), a heating water supply pipe (6), The heating return pipe (7), the heating circulation pump (8) and the heating terminal (9), all components are connected by water pipes;

C. The solar energy and phase-change thermal storage tanks connected in series for heating circulation heating circuit III include solar collectors (1), phase-change thermal storage tanks (5), solar circulation pumps (4), heating water supply pipes (6), The heating return pipe (7), the heating circulation pump (8) and the heating terminal (9), all components are connected by water pipes;

D. The phase change heat storage tank heating cycle heating circuit IV includes a phase change heat storage tank (5), a heating water supply pipe (6), a heating return water pipe (7), a heating circulation pump (8) and a heating terminal (9 ), each component is connected with water pipes;

E. The auxiliary heat source heating cycle heating circuit V includes auxiliary heat source (2), heating water supply pipe (6), heating return water pipe (7), heating circulation pump (8) and heating terminal (9), between each component water pipe connection;

F. The solar energy and auxiliary heat source in series heating cycle heating circuit VI includes solar collector (1), solar circulation pump (4), phase change heat storage tank (5), auxiliary heat source (2) heating water supply pipe (6 ), heating return pipe (7), heating circulation pump (8) and heating terminal (9), all components are connected by water pipes;

G. The above-mentioned solar collector direct heating without heat storage circulating heating loop I, solar collector direct heating plus thermal storage circulating heating loop II, solar energy and phase change heat storage tank in series heating circulating heating loop III, phase change storage The hot box heating cycle heating loop IV, the auxiliary heat source heating cycle heating loop V, and the solar energy and auxiliary heat source series heating cycle heating loop VI alternately operate. The conversion between the heating circuits of each heating cycle is regulated by the valves on the pipeline; the pumps, valve electric control devices, temperature sensors and auxiliary heat source controls in the system are respectively electrically connected to the controller (10);

3. According to the solar composite phase change heat storage heating system according to claim 2, the solar collector and the auxiliary heat source can be connected in series, and when the sun cannot provide heating but some heat can be used, the heating can be used first. The return water is heated to a certain temperature, and then heated by an auxiliary heat source. Can reduce the energy consumption of auxiliary heat source;

4. The solar composite phase change heat storage heating system according to claim 1 and 2, characterized in that the auxiliary heat source can be water source heat pump, ground source heat pump, boiler or other forms of auxiliary heat source, and can be combined with solar energy The collectors are connected in parallel;

5. The solar composite phase change heat storage heat supply system according to claims 1 and 2, characterized in that: the heat storage material in the phase change heat storage tank (5) can be organic matter such as paraffin, fatty acid, etc. It can also be inorganic substances such as water and salt, including the above-mentioned phase-change heat storage material after packaging, and its phase-change temperature is 0-100°C;

6. The solar composite phase change thermal storage heating system according to claims 1 and 2, characterized in that: the heating output circulation loop, the heating end form can be floor radiant heating, radiator heating, or can be Fan coil units, etc.

7. The solar composite phase change heat storage heating system according to claims 1 and 2, characterized in that ethylene glycol or other antifreeze should be added to the heating water to prevent the solar collector from freezing.

Compared with the prior art, the present invention has the following beneficial effects:

(1) The present invention utilizes heat storage materials to collect solar energy, and utilizes the special heat absorption and heat release functions of phase change heat storage materials. When the solar radiation is strong, the remaining heat is stored in the phase change heat storage tank. When the solar radiation is weak The heat in the phase-change heat storage tank is used to heat the building, which avoids the waste of solar energy resources and makes better use of solar energy to heat the building;

(2) The present invention uses phase-change heat storage materials for heat storage. The phase-change materials have high thermal density, compact structure, small volume, high thermal efficiency, constant heat absorption and release temperature, easy to match with the operating system, and easy to control. Save space for users and make it more convenient for users to use;

(3) The present invention adopts various forms such as series and parallel connection of solar energy and auxiliary heat source, and can use solar collectors for direct heating, auxiliary heat source and solar system in series to reduce the opening time of auxiliary heat source, improve the efficiency of auxiliary heat source, and better Use energy to reduce operating costs;

(4) The present invention does not use a plate heat exchanger, but only adds antifreeze to the heating water, which reduces the investment, and can reduce the temperature of the solar heat collector's outlet water, thereby improving the efficiency of the solar heat collector.

(5) The present invention is suitable for general residential buildings and public buildings, and has a wide range of applications.

Description of drawings

Accompanying drawing 1 direct heating of solar heat collector, parallel connection compound system of solar energy and auxiliary heat source

Accompanying drawing 2 is direct heating of solar heat collector, solar energy and auxiliary heat source series-parallel compound system.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

The solar composite phase change heat storage heating system mainly includes solar heat collector (1), auxiliary heat source (2), hot water tank (3), solar circulation pump (4), phase change heat storage tank (5), Heating water supply pipe (6), heating return water pipe (7), heating circulation pump (8), heating terminal (9), controller (10). They are connected with water pipes and installed with valves for regulation.

The invention combines the solar heating system with the phase change heat storage, utilizes the special heat absorption and heat release functions of the phase change heat storage material, and controls the opening and closing of various valves and systems to achieve the purpose of heating. The system operation mode is based on temperature conversion control, and the temperature controls the opening and closing of each system through the controller during the whole process.

It is assumed that the heating supply and return water temperature used in the following implementation example is 50/40 ^o C. The domestic hot water supply temperature is 50 ^o C.

Example 1: Solar energy composite phase change heat storage heating system: direct heating of solar collectors, parallel connection of solar energy and auxiliary heat source composite system. See Figure 1 for the detailed structure and connection of the system.

The system can realize the direct heating of the solar collector, avoiding the excessively long time of the auxiliary heat source being turned on due to the need to heat the phase change heat storage tank to the required heating temperature when the solar system is just turned on; Store it, and use the heat stored in the phase change heat storage tank for heating when the solar radiation is weak. The system does not need a plate heat exchanger, and the solar collector outlet temperature can reach the heating water temperature for heating, and the auxiliary heat source is turned on for less time, but the system needs to add antifreeze to the circulating water of the entire system.

In this system, the solar collector system heats through the heat exchange between the plate heat exchanger and the heating water, and forms a parallel system with the phase change heat storage tank, and stores the excess heat when the solar radiation is strong; it is composed of an auxiliary heat source Parallel system, when neither the solar collector nor the phase change heat storage tank can provide heating, the auxiliary heat source system provides heating.

Since the solar energy system is an open system, it has high requirements on the pressure bearing capacity of the solar heat collector, and the pressure bearing capacity of the solar heat collector should be additionally considered when selecting the solar heat collector. The solar collector system should be determined according to the specific local climate conditions, building area, heating load and other factors. The system has no specific requirements for the solar collector system and can be selected based on the existing technical basis. When selecting the heat accumulator and auxiliary heat source, the influence of the antifreeze added in the circulating water on the heat transfer should be additionally considered. The phase change heat storage material in the phase change heat storage tank is an existing mature product, which can be inorganic water and salt PCM, or paraffin, or fatty acid material, etc. The heat storage temperature, heat storage material and volume of the phase change heat storage tank should be determined according to the local solar radiation, heating supply and return water, the type and area of solar collectors, and economical rationality and other factors. The selection of the auxiliary heat source system should be considered comprehensively with the solar collector system, phase change heat storage tank and heating system.

The invention can be used in general residential buildings and public buildings, and has a wide range of applications. Buildings with existing heating systems can also be remodeled on the original basis, and are relatively easy to implement.

The solar energy composite phase change heat storage heating system of the present invention: the operation process of the solar collector direct heating, solar energy and auxiliary heat source parallel composite system is as follows:

Operation mode 1: The solar system is turned on, and the hot water in the solar collector is directly heated by the plate heat exchanger; the heat storage system and the auxiliary heat source system are turned off. The heating of the system is independently undertaken by the solar system.

Operation mode 2: When the solar system is turned on, part of the hot water in the solar collector is directly heated through the plate heat exchanger, and part of it is supplied to the phase change heat storage tank, so that the excess heat is stored in the phase change heat storage tank; the auxiliary heat source The system shuts down. The heating of the system is independently undertaken by the solar system.

Operation mode 3: The solar system is turned on, the direct heating system of the solar collector and the auxiliary heat source system are turned off, the heat storage system is turned on, and the heat accumulated in the phase change heat storage tank is used for heating, and the heating of the system is independently undertaken by the solar system.

Operation mode 4: The solar system and the auxiliary heat source system are turned off, the heat storage system is turned on, and the heat accumulated in the phase change heat storage tank is used for heating, and the heating of the system is still independently borne by the solar energy.

Operation mode 5: the solar collector system and heat storage system are turned off, and the auxiliary heat source system is turned on. The heating of the system is independently undertaken by the auxiliary heat source system.

From the characteristics of different operating modes, the operating modes of different weathers can be obtained.

the mode of operation 1 mode of operation 2 mode of operation 3 Run mode 4 Run mode 5 sunny √ √ √ √ base on needs partly cloudy √ √ √ √ √ rainy day base on needs the the the √

The solar composite phase change heat storage heating system of the present invention: the solar collector direct heating, the solar energy and the auxiliary heat source parallel composite system are controlled in different weathers:

Sunny day : When the solar radiation can basically meet the heating load of the whole day, there is no need to run mode 5, start from turning on the solar system in the morning, and run modes 1, 2, 3, 4 in sequence; if the solar radiation cannot meet the heating load of the whole day , starting from turning on the solar system in the morning, the operation mode 1, 2, 3, 4, 5 in sequence.

Cloudy: At this time, the solar radiation generally cannot meet the heating load of the whole day. Starting from turning on the solar system in the morning, the operation modes 1, 2, 3, 4, and 5 are sequentially operated.

Cloudy and rainy days: In cloudy and rainy days, the amount of solar radiation is very small, and modes 2, 3, and 4 basically cannot operate. It may be possible to operate mode 1 when the solar radiation is strong on cloudy days, but it is mainly operated in mode 5, and it can only be operated in mode 5 in rainy days.

The work and control process of embodiment 1 are:

1. When heating, give priority to the use of solar energy, and use temperature control to start and stop the solar cycle system. When the outlet water temperature of the solar collector (1) is less than 50 ^o C, the temperature sensor A inputs a temperature signal to the controller (10), and the controller (10) sends a control command to close the three-way valves 12, 13, 14 and close the valves 11, 19, 20 and the solar circulation system, the solar heat collector (1) is in the state of suffocation, open the three-way valve 15, 16 and the heating circulation pump (8), and control the three-way valve 15, 16 to make the solar heat collection Before the water temperature at the outlet of the device (1) reaches 50 ^o C, the auxiliary heat source (2) operates independently, and the heating of the system is independently undertaken by the auxiliary heat source.

2. When the water temperature at the outlet of the solar collector (1) is greater than 50 ^o C, the temperature sensor A inputs a temperature signal to the controller (10), and the controller (10) sends a control command, the solar circulation system is turned on, and the auxiliary heat source system is turned off. Valves 11, 19, 20 are closed, three-way valves 12, 13, 14, 15, 16 and heating circulation pump (8) are opened, and the solar energy system is turned into independent operation. Before the water temperature at the outlet of the solar collector (1) reaches 55 ^o C, the temperature sensor A inputs a temperature signal to the controller (10), and the controller (10) sends a control command to control the three-way valves 12, 13, 14, 15 , 16, so that the heating is directly supplied by the solar heat collector (1), and does not store heat in the phase change heat storage tank (5) and the hot water tank (3); when the outlet water temperature of the solar heat collector (1) is greater than 55 After ^o C, by controlling the three-way valves 12, 13, 14, 15, and 16, the solar cycle system can directly supply heat on the one hand, and store heat in the phase change heat storage tank (5) on the other hand. At this time, the heating of the system is directly provided by the solar heat collector (1), and the heating of the system is independently undertaken by the solar circulation system.

3. When the water temperature at the heating outlet in the phase change heat storage tank (5) is greater than 50 ^o C but not 55 ^o C, the temperature sensor B sends a signal to open the three-way valves 12, 13, 14, 15, 16 and valves 19, 20 , by controlling the three-way valves 13, 14, 15, and 16, the direct heating of the solar heat collector (1) is stopped, and only the heat is stored, and the heat is transferred to the phase-change heat storage tank (5) for heating. At this time, the solar circulation system and the phase-change heat storage heating system operate simultaneously, and the heating of the system is jointly undertaken by the phase-change heat storage heating system and the solar energy system.

4. When the temperature of the heating outlet water in the phase-change heat storage tank (5) is greater than 55 ^o C, the temperature sensor B sends a signal to open the valve 11, and the solar collector (1) stops heating to the phase by controlling the three-way valve 12. The variable heat storage tank (5) supplies heat, and all the heat is supplied to the hot water tank (3) to prevent the heating system from overheating. At this time, the heating of the system is independently undertaken by the phase change heat storage tank; when the phase change heat storage tank (5) When the water temperature at the heating outlet is lower than 45 ^o C, the temperature sensor B sends a signal to stop the solar collector (1) from supplying heat to the hot water tank (3), and all the heat is supplied to the phase change heat storage tank (5). The heat accumulated in the hot water tank (3) can prevent the water in the solar heat collector (1) from freezing when the solar circulation system is closed at night.

Example 2: Solar energy composite phase change heat storage heating system: direct heating of solar collectors, solar energy and auxiliary heat source series-parallel composite system. See Figure 2 for the detailed structure and connection of the system. Compared with the system of Example 1, the advantage of this system is that the solar radiation can be stored in the phase-change thermal storage tank when the solar energy system cannot directly provide heating on cloudy days. The solar energy system and the auxiliary heat source form a series system, and the phase-change thermal storage tank The heat in the heating system first heats the heating return water to a certain temperature, and then the auxiliary heat source heats it to the water supply temperature, which can reduce the energy consumption of the auxiliary heat source and make more use of solar energy.

The selection of each part in the solar composite phase change thermal storage heating system is the same as that of the solar composite phase change thermal storage heating system in Embodiment 1, and the two are only slightly different in connection form. There is an additional operating mode 6 in the operating mode.

Operation mode 6: When the outlet temperature of the solar collector has not reached the heating temperature but there is a certain temperature rise, the thermal storage system and the auxiliary heat source system are turned on at this time, and the two are connected in series to provide heating for the system.

The operating mode of sunny days, cloudy days and rainy days is the same as that of the solar composite phase change thermal storage heating system in Embodiment 1.

Cloudy day: In the morning, the solar energy system is turned on to run modes 6 and 5 in sequence.

The work and control process of embodiment 4 are:

1. When heating, give priority to the use of solar energy, and use temperature control to start and stop the solar cycle system. When the outlet water temperature of the solar collector (1) is less than 50 ^o C, the temperature sensor A inputs a temperature signal to the controller (10), and the controller (10) sends a control command to close the three-way valves 12, 13, 14, 17, Close the valves 11, 19 and the solar circulation system, the solar collector (1) is in the state of suffocation, open the three-way valves 15, 16, 18 and the heating circulation pump (8), and control the three-way valves 15, 16, 18, Before the outlet water temperature of the solar collector (1) reaches 50 ^o C, the auxiliary heat source (2) operates independently, and the heating of the system is independently undertaken by the auxiliary heat source.

2. On cloudy days, the auxiliary heat source operates independently. When the solar collector (1) is suffocated to the set maximum operating hours, the outlet water temperature of the solar collector (1) is still less than 50 ^o C. At this time, the temperature sensor A Input the temperature signal to the controller (10), the controller (10) sends a control command, the three-way valves 12, 13, 14, 15, 16, 17, and 18 are opened, and the valve 19 is opened. At this time, the solar cycle system and the auxiliary heat source are combined In operation, by controlling the three-way valves 12, 13, 14, the solar cycle system only stores heat in the phase change heat storage tank (5) without heating. Control the three-way valves 15, 16, 17, and 18 so that the phase change heat storage tank (5) does not heat the heating return water directly, but supplies it to the auxiliary heat source (2), and in the auxiliary heat source (2) Heat it to 50 ^o C before serving warm. At this time, the heating of the system is jointly undertaken by the auxiliary heat source and the solar cycle system, and the two are connected in series for heating.

3. When the water temperature at the outlet of the solar collector (1) is greater than 50 ^o C, the temperature sensor A inputs a temperature signal to the controller (10), and the controller (10) sends a control command, the solar circulation system is turned on, and the auxiliary heat source system is turned off. Open the three-way valves 12, 13, 14, 15, 16, the heating circulation pump (8) and the solar circulation pump (4) to switch to the independent operation of the solar energy system. Before the water temperature at the outlet of the solar collector (1) reaches 55 ^o C, the temperature sensor A inputs a temperature signal to the controller (10), and the controller (10) issues a control command, by controlling the three-way valves 12, 13, 14, The heating is directly supplied by the solar heat collector (1), and the heat is not stored in the phase change heat storage tank (5); when the outlet water temperature of the solar heat collector (1) is greater than 55 ^o C, by controlling the three-way valve 12, 13 and 14, so that the solar cycle system directly supplies heat on the one hand, and stores heat in the phase change heat storage box (5) on the other hand. At this time, the heating of the system is directly provided by the solar collector, and the heating of the system is independently undertaken by the solar circulation system.

4. When the water temperature at the heating outlet in the phase change heat storage tank (5) is greater than 50 ^o C but not 55 ^o C, the temperature sensor B sends a signal to open the three-way valves 12, 13, 14, 15, 16, 17 and valve 19 , by controlling the three-way valves 12, 13, 14, the direct heating of the solar heat collector is stopped, and the heating is transferred to the phase change thermal storage tank (5). By controlling the three-way valves 15, 16, and 17, the phase change heat storage tank (5) directly heats the heating return water. At this time, the phase change heat storage and the solar energy system operate simultaneously, and the heating of the system is provided by the phase change heat storage heating system and the solar energy system. Shared responsibility.

5. When the temperature of the heating outlet water in the phase-change heat storage tank (5) is greater than 55 ^o C, the temperature sensor B sends a signal to open the valve 11, and the solar collector (1) stops heating to the phase by controlling the three-way valve 12. The variable heat storage tank (5) supplies heat, and all the heat is supplied to the hot water tank (3) to prevent the heating system from overheating. At this time, the heating of the system is independently undertaken by the phase change heat storage tank; when the phase change heat storage tank (5) When the water temperature at the heating outlet is lower than 45 ^o C, the temperature sensor B sends a signal to stop the solar heat collector from supplying heat to the hot water tank (3), and all the heat is supplied to the phase change heat storage tank (5). The heat accumulated in the hot water tank (3) can prevent the water in the solar collector from freezing when the solar circulation system is closed at night.

Claims (7)

1. Solar composite phase-change thermal storage heating system, including the solar collector direct heating non-thermal storage circulation heating circuit I mainly composed of solar collector (1) and heating terminal (9), including mainly solar collector Solar collector (1), phase change heat storage tank (5), and heating terminal (9) are composed of solar collector direct heating plus heat storage cycle heating circuit II, including mainly composed of solar heat collector (1), phase change heat storage Solar energy and phase-change heat storage box series heating cycle heating circuit III composed of box (5) and heating terminal (9), including phase-change heat storage box mainly composed of phase-change heat storage box (5) and heating terminal (9) The heating cycle heating circuit IV includes the auxiliary heat source heating cycle heating circuit V mainly composed of the auxiliary heat source (2) and the heating terminal (9), which is characterized in that: A. The solar collector direct heating without heat storage circulation heating loop I includes solar collector (1), solar circulation pump (4), heating water supply pipe (6), heating return water pipe (7), heating circulation The pump (8) and the heating terminal (9) are connected by water pipes between each component; B. The solar heat collector direct heating plus thermal storage circulation heating circuit II includes a solar heat collector (1), a solar circulation pump (4), a phase change heat storage tank (5), a heating water supply pipe (6), The heating return pipe (7), the heating circulation pump (8) and the heating terminal (9), all components are connected by water pipes; C. The solar energy and phase-change thermal storage tanks connected in series for heating circulation heating circuit III include solar collectors (1), phase-change thermal storage tanks (5), solar circulation pumps (4), heating water supply pipes (6), The heating return pipe (7), the heating circulation pump (8) and the heating terminal (9), all components are connected by water pipes; D. The phase change heat storage tank heating cycle heating circuit IV includes a phase change heat storage tank (5), a heating water supply pipe (6), a heating return water pipe (7), a heating circulation pump (8) and a heating terminal (9 ), each component is connected with water pipes; E. The auxiliary heat source heating cycle heating circuit V includes auxiliary heat source (2), heating water supply pipe (6), heating return water pipe (7), heating circulation pump (8) and heating terminal (9), between each component water pipe connection; F. The above-mentioned solar collector direct heating without heat storage circulating heating loop I, solar collector direct heating plus thermal storage circulating heating loop II, solar energy and phase change heat storage tank in series heating circulating heating loop III, phase change storage The hot box heating cycle heating loop IV and the auxiliary heat source heating cycle heating loop V operate alternately; the conversion between each heating cycle heating loop is regulated by the valve on the pipeline; the pump, valve electronic control device, temperature sensor and auxiliary heat source control in the system are respectively It is electrically connected with the controller (10). 2. Solar composite phase-change thermal storage heating system, including the solar collector direct heating non-thermal storage cycle heating circuit I mainly composed of solar collector (1) and heating terminal (9), including the solar thermal collector Solar collector (1), phase change heat storage tank (5), and heating terminal (9) are composed of solar collector direct heating plus heat storage cycle heating circuit II, including mainly composed of solar heat collector (1), phase change heat storage Solar energy and phase-change heat storage box series heating cycle heating circuit III composed of box (5) and heating terminal (9), including phase-change heat storage box mainly composed of phase-change heat storage box (5) and heating terminal (9) Heating cycle heating loop IV, including auxiliary heat source heating cycle heating loop V mainly composed of auxiliary heat source (2) and heating terminal (9), including solar heat collector (1), solar circulation pump (4), phase change The heat storage box (5), the auxiliary heat source (2), and the heating terminal (9) are composed of solar energy and auxiliary heat source in series heating cycle heating circuit VI; it is characterized in that: A. The solar collector direct heating without heat storage circulation heating loop I includes solar collector (1), solar circulation pump (4), heating water supply pipe (6), heating return water pipe (7), heating circulation The pump (8) and the heating terminal (9) are connected by water pipes between each component; B. The solar heat collector direct heating plus thermal storage circulation heating circuit II includes a solar heat collector (1), a solar circulation pump (4), a phase change heat storage tank (5), a heating water supply pipe (6), The heating return pipe (7), the heating circulation pump (8) and the heating terminal (9), all components are connected by water pipes; C. The solar energy and phase-change thermal storage tanks connected in series for heating circulation heating circuit III include solar collectors (1), phase-change thermal storage tanks (5), solar circulation pumps (4), heating water supply pipes (6), The heating return pipe (7), the heating circulation pump (8) and the heating terminal (9), all components are connected by water pipes; D. The phase change heat storage tank heating cycle heating circuit IV includes a phase change heat storage tank (5), a heating water supply pipe (6), a heating return water pipe (7), a heating circulation pump (8) and a heating terminal (9 ), each component is connected with water pipes; E. The auxiliary heat source heating cycle heating circuit V includes auxiliary heat source (2), heating water supply pipe (6), heating return water pipe (7), heating circulation pump (8) and heating terminal (9), between each component water pipe connection; F. The solar energy and auxiliary heat source in series heating cycle heating circuit VI includes solar collector (1), solar circulation pump (4), phase change heat storage tank (5), auxiliary heat source (2) heating water supply pipe (6 ), heating return pipe (7), heating circulation pump (8) and heating terminal (9), all components are connected by water pipes; G. The above-mentioned solar collector direct heating without heat storage circulating heating loop I, solar collector direct heating plus thermal storage circulating heating loop II, solar energy and phase change heat storage tank in series heating circulating heating loop III, phase change storage Hot box heating cycle heating loop IV, auxiliary heat source heating cycle heating loop V, solar energy and auxiliary heat source series heating cycle heating loop VI operate alternately; the conversion between each heating cycle heating loop is regulated by valves on the pipeline; pumps and valves in the system The electric control device, the temperature sensor and the auxiliary heat source control are respectively electrically connected to the controller (10). 3. According to the solar composite phase change heat storage heating system according to claim 2, the solar heat collector and the auxiliary heat source can be connected in series, and when the sun cannot provide heating but some heat can be used, the heating system can be used first. The return water is heated to a certain temperature, and then heated by the auxiliary heat source, which can reduce the energy consumption of the auxiliary heat source. 4. The solar composite phase change heat storage heating system according to claim 1, 2, characterized in that the auxiliary heat source can be water source heat pump, ground source heat pump, boiler or other forms of auxiliary heat source, and can be combined with solar energy The collectors are connected in parallel. 5. The solar composite phase change heat storage heating system according to claim 1 and 2, characterized in that: the heat storage material in the phase change heat storage tank (5) can be organic matter such as paraffin, fatty acid, etc. It can also be inorganic substances such as water and salt, and also includes the above-mentioned phase-change heat storage material after packaging, and its phase-change temperature is between 0 and 100°C. 6. The solar composite phase change heat storage heating system according to claim 1, 2, characterized in that: the heating output circulation loop, the heating terminal form can be floor radiation heating, radiator heating, or can be Fan coil units, etc. 7. The solar composite phase change heat storage heating system according to claim 1, 2, characterized in that ethylene glycol or other antifreeze should be added to the heating water to prevent the solar collector from freezing.

Images