Temperature regulation control method for air heat collector heating system

Abstract

The invention relates to the technical field of renewable energy application building heating, in particular to an air heat collector heating system temperature regulation control method which comprises an air heat collector, an outlet of the air heat collector communicates with an indoor air supply outlet through an air supply pipeline, and a return opening of the air heat collector communicates with an indoor air return opening through an air return pipeline. The air return pipeline is communicated with the air supply pipeline through a temperature adjusting pipeline; with the node of the temperature adjusting pipeline and the air supply pipeline as a demarcation point, a fourth flow adjusting valve and a temperature sensing element used for monitoring the airflow temperature T4 are arranged at the position, away from the indoor air supply outlet, of the air supply pipeline, and a temperature sensing element used for monitoring the airflow temperature T6 is arranged at the position, close to the indoor air supply outlet, of the air supply pipeline; a fifth flow adjusting valve is arranged on the temperature adjusting pipeline, and a temperature sensing element used for monitoring the airflow temperature T5 is arranged at the position, close to the indoor air return opening, of the air return pipeline with the joint of the temperature adjusting pipeline and the air return pipeline as the demarcation point.

Description

Technical Field

[0001] The invention relates to the technical field of renewable energy application building heating, and in particular to a temperature adjustment control method for an air collector heating system. Background Art

[0002] A solar heating system refers to a system that uses solar collectors to absorb solar radiation energy and convert it into heat energy, which is then transported to buildings to meet the heating needs of the buildings. Common solar heating systems include flat plate collector solar heating systems, vacuum tube collector solar heating systems, CPC collector solar heating systems, and the like. The above-mentioned solar heating systems use water or antifreeze as heat transfer media and belong to the heating systems of solar water systems. They have the risks of freezing, scaling, and leakage, and require additional antifreeze and anti-scaling measures, which increases heating costs. Antifreeze, as a solar circulation medium, can solve the problem of outdoor freezing and blockage, but a heat exchanger needs to be added, which increases system costs and reduces system efficiency. In addition, the heating system of the solar water system needs to heat all the water, and the system starts slowly.

[0003] In addition, the solar heating system can also use air collectors to form a wind system heating system. The solar wind system heating system collects heat through air collectors, and the hot air is transported to the building through air ducts for heating. The solar wind system heating system has the advantages of fast startup, no risk of freezing and scaling, simple system structure, no need to fill the collector with medium, and easy installation. However, the existing air collector heating system has the problem of heat and temperature being difficult to control, and cannot ensure stable and comfortable indoor temperature. The system has poor stability and continuity, and cannot meet the heating problem at night. Summary of the invention

[0004] The present invention provides a temperature control method for an air collector heating system, which solves the problem in the prior art that the hot air of the air collector heating system cannot be adjusted, resulting in unstable indoor temperature, and can achieve constant temperature heating and improve heating comfort.

[0005] The present invention is achieved through the following technical solutions: A temperature control method for an air collector heating system, comprising an air collector, wherein the outlet of the air collector is connected to an indoor air supply port via an air supply duct, the return port of the air collector is connected to an indoor return air port via a return air duct, and the return air duct is connected to the air supply duct via a temperature control duct; Taking the node of the temperature control duct and the air supply duct as the dividing point, a fourth flow regulating valve and a temperature sensing element for monitoring the air flow temperature T4 are arranged at a position of the air supply duct away from the indoor air supply outlet, and a temperature sensing element for monitoring the air flow temperature T6 is arranged at a position of the air supply duct close to the indoor air supply outlet; The temperature control pipe is provided with a fifth flow regulating valve, and a temperature sensing element for monitoring the air flow temperature T5 is provided at a position of the return air duct near the indoor return air outlet, with the node between the temperature control pipe and the return air duct as the dividing point; It includes the following steps: S10, preset air supply temperature T; S20, when the air in the air supply duct meets the heating conditions, the air enters the room through the air supply duct; The indoor air returns to the air collector through the return air duct to continue heating; S30, monitoring T4, T5 and T6, and controlling the air mixing ratio of the supply air duct and the return air duct by adjusting the fourth flow regulating valve and the fifth flow regulating valve to make T6 equal to T; S40, real-time monitoring of T6, calibration of the fourth flow regulating valve and the fifth flow regulating valve, to achieve constant temperature heating.

[0006] Further, in step S30, T4*Q1+T5*Q2=T*Q; Q1+Q2=Q; Where: Q1 is the air volume in the air supply duct without mixing with return air, Q2 is the air volume in the temperature control duct, and Q is the air volume in the air supply duct after mixing with return air; Through the above formula, according to the real-time temperatures of T4 and T5, the preset temperature of the supply air temperature T, and the preset supply air volume Q, Q1 and Q2 are calculated to preliminarily determine the opening of the fourth flow control valve and the fifth flow control valve; In step S40, the temperature value of T6 is monitored every 1 minute, and when T6>T, the opening of the fourth flow regulating valve is reduced and the opening of the fifth flow regulating valve is increased; When T6<T, the opening degree of the fourth flow rate regulating valve is increased, and the opening degree of the fifth flow rate regulating valve is decreased.

[0007] Furthermore, the supply air temperature T is 38°C-42°C.

[0008] Furthermore, a hybrid pump is provided at a position of the air supply duct close to the indoor air supply outlet, taking the node of the temperature control duct and the air supply duct as the dividing point; In executing step S30, the hybrid pump needs to be turned on to allow the air in the temperature control duct to enter the air supply duct for mixing.

[0009] Furthermore, a fresh air duct is connected to the return air duct near the indoor return air outlet, the fresh air duct is used to connect to the outdoor air inlet, and a seventh flow regulating valve is provided on the fresh air duct; Taking the node of the fresh air duct and the return air duct as the dividing point, a sixth flow regulating valve is arranged at a position of the return air duct close to the indoor return air outlet; Also includes, S50, monitor indoor temperature t, indoor PM2.5 and indoor C0 through air quality and temperature monitor 2 concentration; S60, when the indoor temperature t<16℃, or the indoor temperature t is between 16-24℃, and PM2.5≤50μg / m3, CO 2 When the concentration is ≤1000PPm, the system starts the closed cycle heating mode, the seventh flow regulating valve is closed to prevent the mixing of outdoor cold air, and the sixth flow regulating valve is opened to realize indoor air circulation heating; When 75 μg / m 3 <PM2.5<150μg / m 3 Or 1000ppm<CO 2 When the concentration is less than 2000ppm, the system starts the semi-fresh air heating mode, the sixth flow regulating valve and the seventh flow regulating valve are opened halfway at the same time, and the fresh air and indoor air are mixed into the return air duct in a ratio of 1:1; When PM2.5≥150μg / m 3 or C0 2 When the concentration is ≥2000ppm, the sixth flow regulating valve is closed and the seventh flow regulating valve is opened. Fresh air is used for heating and a slight positive pressure is maintained in the heating room.

[0010] Furthermore, the air supply duct and the return air duct are connected to a switching duct at a position close to the air heat collector, and a third flow regulating valve is provided on the switching duct; Taking the node of the switching duct and the air supply duct as the dividing point, a first flow regulating valve is arranged at a position of the air supply duct close to the air outlet of the air collector, and a heat storage module is arranged at a position of the air supply duct far from the air outlet of the air collector; Taking the node between the switching duct and the return air duct as the dividing point, a second flow regulating valve is arranged at a position of the return air duct close to the return air outlet of the air collector.

[0011] Furthermore, the heat storage module is a phase change heat storage device, and a heating wire is also arranged in the heat storage module. The phase change temperature of the phase change heat storage material of the heat storage module is 45-50°C.

[0012] Further, in step S20, when the system is in the air collector independent heating mode, the outlet temperature T2 of the air collector is ≥45°C, the air collector meets the heating conditions, the first flow regulating valve and the second flow regulating valve are opened, and the third flow regulating valve is closed. After being heated by the air collector, the air enters the room through the air supply duct, and the indoor air returns to the air collector through the return air duct to continue heating. When the indoor temperature t is lower than the set temperature by more than 10°C, or it enters the off-peak period, or the electric auxiliary heating is manually turned on, the system enters the air collector combined with electric auxiliary heating heating mode, the first flow regulating valve and the second flow regulating valve are opened, the third flow regulating valve is closed, the heating wire of the heat storage module is turned on, and the air enters the heat storage module after passing through the air collector and continues to be heated under the heating wire. Part of the heat is stored in the phase change material of the heat storage module, and the remaining heat enters the air supply duct with the hot air; Monitor the inlet temperature T1 and outlet temperature T2 of the air collector. When T2-T1≤5℃ and T2<45℃, the air collector does not meet the heating conditions, and the system enters the heat storage module heating mode. The first flow regulating valve and the second flow regulating valve are closed, and the third flow regulating valve is opened. The air enters the heat storage module and is heated by the phase change material and / or the heating wire to form hot air that enters the air supply duct. When the indoor temperature t reaches the set requirement, the heating system stops supplying heat to the room, T2≥45℃, the air collector stores heat in non-heating mode, the third flow regulating valve, the sixth flow regulating valve and the seventh flow regulating valve are closed, the first flow regulating valve, the second flow regulating valve, the fourth flow regulating valve and the fifth flow regulating valve are opened, the air enters the air collector and heats up before entering the heat storage module, storing the heat in the phase change material, and the air after heat exchange enters the air collector again to collect heat, and the cycle continues until T2-T3≤1℃, and the heat storage module completes heat storage.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. By adjusting the fourth flow regulating valve and the fifth flow regulating valve to control the air mixing ratio of the supply air duct and the return air duct, T6 is made close to or even equal to T, so as to ensure that the temperature of the hot air sent into the room is relatively constant, and constant temperature heating can be achieved, solving the problem of uncontrollable heating temperature of the existing air collector, and continuously heating with a small temperature difference, thereby improving heating comfort; 2. The heat storage module can achieve stable and continuous heating. The electric heating wire effectively utilizes off-peak electricity, reduces energy costs, and makes up for the uncontrollable, unstable and unsustainable shortcomings of heating with a simple air collector; 3. The present invention has an independent heating mode of an air collector, an air collector combined with electric auxiliary heating mode, a heat storage module independent heating mode and an air collector heat storage non-heating mode. It has a multi-mode working scene, is suitable for different climatic conditions and customer needs, and meets customers' energy-saving, comfortable and healthy heating needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the air collector heating system described in this embodiment; In the figure: 1. air collector, 2. heat storage module, 3. hybrid pump, 4. air supply duct, 5. return air duct, 6. switching duct, 7. first flow regulating valve, 8. second flow regulating valve, 9. third flow regulating valve, 10. fourth flow regulating valve, 11. fifth flow regulating valve, 12. temperature control duct, 13. fresh air duct, 14. sixth flow regulating valve, 15. seventh flow regulating valve, 16. air quality and temperature monitor. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0016] In the description of the invention, it is necessary to understand that the directions or positional relationships indicated by the terms "front", "rear", "up", "down", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the invention.

[0017] The present embodiment discloses an air collector heating system, which mainly includes an air collector 1, a heat storage module 2, a duct fan, a hybrid pump 3, and ducts. The outlet of the air collector 1 is connected to the indoor air supply port through the air supply duct 4, and the return port of the air collector 1 is connected to the indoor return air port through the return air duct 5. A temperature sensing element for monitoring the air flow temperature T1 is installed at the inlet of the air collector 1, and a temperature sensing element for monitoring the air flow temperature T2 is installed at the outlet of the air collector.

[0018] The air supply duct 4 and the return air duct 5 are connected with a switching duct 6 at a position close to the air collector. The node between the switching duct 6 and the air supply duct 4 is used as a dividing point. A first flow regulating valve 7 is set at a position of the air supply duct 4 close to the air collector outlet, and a heat storage module 2 is set at a position of the air supply duct 4 far from the air collector outlet. The node between the switching duct 6 and the return air duct 5 is used as a dividing point. A second flow regulating valve 8 is set at a position of the return air duct 5 close to the air collector return air outlet, and a third flow regulating valve 9 is set on the switching duct 6. The heat storage module 2 is a conventional phase change heat exchanger. A heating wire is also installed in the heat storage module 2. The phase change temperature of the phase change heat storage material of the heat storage module 2 is 45-50°C. A temperature sensing element for monitoring the air flow temperature T3 is installed at the outlet of the heat storage module 2. The heat storage module 2 can achieve an outlet air temperature of about 40°C. On the one hand, it can store excess heat in the system, and on the other hand, it does not affect the normal heating temperature. When the outlet temperature of the air collector 1 is lower than 45°C, the phase change material no longer absorbs heat and directly provides heating. The heat storage module 2 stores heat during the day and provides heating at night. At the same time, the electric heating wire equipped with the heat storage module 2 can realize the use of off-peak electricity and reduce energy costs.

[0019] The return air duct 5 is connected to the supply air duct 4 through the temperature regulating duct 12. The node between the temperature regulating duct 12 and the supply air duct 4 is used as the dividing point. A fourth flow regulating valve 10 and a temperature sensing element for monitoring the air flow temperature T4 are arranged at a position of the supply air duct 4 away from the indoor air supply outlet. A hybrid pump 3 and a temperature sensing element for monitoring the air flow temperature T6 are arranged at a position of the supply air duct 4 close to the indoor air supply outlet. A fifth flow regulating valve 11 is installed on the temperature regulating duct 12. The node between the temperature regulating duct 12 and the return air duct 5 is used as the dividing point. A temperature sensing element for monitoring the air flow temperature T5 is arranged at a position of the return air duct 5 close to the indoor return air outlet.

[0020] A fresh air duct 13 is connected to the return air duct 5 at a position close to the indoor return air outlet. The fresh air duct 13 is used to connect to the outdoor air inlet, and a seventh flow regulating valve 15 is arranged on the fresh air duct 13; with the node between the fresh air duct 13 and the return air duct 5 as the dividing point, a sixth flow regulating valve 14 is arranged at a position of the return air duct 5 close to the indoor return air outlet.

[0021] According to GB / T 18883-2022 "Indoor Air Quality Standard", indoor air quality must meet PM2.5≤50μg / m3, CO 2 Concentration ≤1000PPm. Taking the requirement of indoor temperature 16-24℃ in winter and indoor air flow rate ≤0.2m / s as an example, based on the above-mentioned air collector heating system, this embodiment also discloses a temperature control method of the air collector heating system, which includes the following steps: S10, preset air supply temperature T. In this embodiment, based on life experience, the air supply temperature T is set to 38°C-42°C, which can maintain the indoor temperature at about 20°C in winter; S20, when the air in the air supply duct meets the heating conditions, that is, the air supply temperature T reaches 38°C-42°C, it enters the room through the air supply duct; the indoor air returns to the air collector through the return air duct to continue heating; In winter, in order to make the air in the air supply duct meet the heating conditions, this embodiment has operation modes for different situations: When the system is in the air collector independent heating mode, the outlet temperature of the air collector T2 ≥ 45 ° C, the air collector meets the heating conditions, the first flow control valve and the second flow control valve are opened, and the third flow control valve is closed. The air is heated by the air collector and then enters the room through the air supply duct. The indoor air returns to the air collector through the return air duct to continue heating. When the indoor temperature t is lower than the set temperature by more than 10°C, or it enters the off-peak period, or the electric auxiliary heating is manually turned on, the system enters the air collector combined with electric auxiliary heating heating mode, the first flow regulating valve and the second flow regulating valve are opened, the third flow regulating valve is closed, the heating wire of the heat storage module is turned on, and the air enters the heat storage module after passing through the air collector and continues to be heated under the heating wire. Part of the heat is stored in the phase change material of the heat storage module, and the remaining heat enters the air supply duct with the hot air; this mode can accelerate the indoor temperature rise, so that the indoor temperature reaches the set temperature quickly, and at the same time, it can use the off-peak electricity to store energy and provide heating at night, reducing energy costs; Monitor the inlet temperature T1 and outlet temperature T2 of the air collector. When T2-T1≤5℃ and T2<45℃, the air collector does not meet the heating conditions, and the system enters the heat storage module heating mode. The first flow regulating valve and the second flow regulating valve are closed, and the third flow regulating valve is opened. The air enters the heat storage module and is heated by the phase change material and / or the heating wire to form hot air that enters the air supply duct. This mode is mainly started at night or when the solar radiation is insufficient, and can achieve stability and reliability of indoor heating; When the indoor temperature t reaches the set requirement, the heating system stops supplying heat to the room, T2≥45℃, the air collector stores heat in non-heating mode, the third flow regulating valve, the sixth flow regulating valve and the seventh flow regulating valve are closed, the first flow regulating valve, the second flow regulating valve, the fourth flow regulating valve and the fifth flow regulating valve are opened, the air enters the air collector and heats up before entering the heat storage module, where the heat is stored in the phase change material, and the air after heat exchange enters the air collector again to collect heat, and the cycle continues until T2-T3≤1℃, and the heat storage module completes heat storage; S30, the mixing pump needs to be turned on to allow the air in the temperature control duct to enter the air supply duct for mixing, monitor T4, T5 and T6, and control the air mixing ratio of the air supply duct and the return air duct by adjusting the fourth flow control valve and the fifth flow control valve to make T6 equal to T; In this step, T4*Q1+T5*Q2=T*Q; Q1+Q2=Q; Where: Q1 is the air volume in the air supply duct without mixing with return air, Q2 is the air volume in the temperature control duct, and Q is the air volume in the air supply duct after mixing with return air; Through the above formula, according to the real-time temperatures of T4 and T5, the preset temperature of the supply air temperature T, and the preset supply air volume Q, Q1 and Q2 are calculated to preliminarily determine the opening of the fourth flow control valve and the fifth flow control valve; For example: T4 temperature is 65℃, T5 temperature is 22℃, the design air supply temperature T is 42℃, the air supply velocity is 0.2m / s, the air supply pipe diameter is 200mm, and the air supply flow rate Q=πR 2 V = π × 0.1 2 ×0.2×3600=22.6m³ / h. According to the above calculation formula, Q1=10.5 m³ / h, Q2=12.1 m³ / h. After the control system calculates Q1 and Q2 internally, it sends instructions to the fourth flow control valve and the fifth flow control valve to adjust the opening of the fourth flow control valve and the fifth flow control valve to achieve constant temperature heating; S40, real-time monitoring of T6, calibration of the fourth flow regulating valve and the fifth flow regulating valve, to achieve constant temperature heating; In this step, the temperature value of T6 is monitored every 1 minute. When T6>T, the opening of the fourth flow control valve is reduced and the opening of the fifth flow control valve is increased; when T6<T, the opening of the fourth flow control valve is increased and the opening of the fifth flow control valve is reduced. S50, install air quality and temperature monitor 16 indoors, monitor indoor temperature t, indoor PM2.5 and indoor C0 through air quality and temperature monitoring, 16 2 concentration; S60, when the indoor temperature t<16℃, or the indoor temperature t is between 16-24℃, and PM2.5≤50μg / m3, CO 2 When the concentration is ≤1000PPm, the system starts the closed-loop heating mode, the seventh flow regulating valve is closed to prevent the mixing of outdoor cold air, and the sixth flow regulating valve is opened to realize indoor air circulation heating; this mode has low system energy loss and can achieve a steady and rapid increase in indoor temperature. It is suitable for the initial operation of the system, cold weather and daily energy-saving mode.

[0022] When 75 μg / m3 <PM2.5<150μg / m 3 Or 1000ppm<CO 2 When the concentration is less than 2000ppm, the system starts the semi-fresh air heating mode, the sixth flow regulating valve and the seventh flow regulating valve are opened halfway at the same time, and the fresh air and indoor air are mixed in a 1:1 ratio and enter the return air duct; this mode ensures the heating effect of the system while maintaining a certain amount of fresh air in the room, which is an energy-saving and comfortable mode; When PM2.5≥150μg / m 3 or C0 2 When the concentration is ≥2000ppm, the sixth flow regulating valve is closed and the seventh flow regulating valve is opened. All heating is done with fresh air, and the heating room is kept in a slightly positive pressure state. This mode can achieve fresh air heating, good air quality, slow overall indoor temperature rise, and high system energy consumption. It can be turned on when the air quality is poor or the temperature difference between indoor and outdoor is small to ensure indoor air quality.

Claims

1. A temperature control method for an air collector heating system, characterized in that: It includes an air collector, the outlet of the air collector is connected to the indoor air supply port through an air supply duct, the return port of the air collector is connected to the indoor return air port through a return air duct, and the return air duct is connected to the air supply duct through a temperature regulating duct; Taking the node of the temperature control duct and the air supply duct as the dividing point, a fourth flow regulating valve and a temperature sensing element for monitoring the air flow temperature T4 are arranged at a position of the air supply duct away from the indoor air supply outlet, and a temperature sensing element for monitoring the air flow temperature T6 is arranged at a position of the air supply duct close to the indoor air supply outlet; The temperature control pipe is provided with a fifth flow regulating valve, and a temperature sensing element for monitoring the air flow temperature T5 is provided at a position of the return air duct near the indoor return air outlet, with the node between the temperature control pipe and the return air duct as the dividing point; It includes the following steps: S10, preset air supply temperature T; S20, when the air in the air supply duct meets the heating conditions, the air enters the room through the air supply duct; The indoor air returns to the air collector through the return air duct to continue heating; S30, monitoring T4, T5 and T6, and controlling the air mixing ratio of the supply air duct and the return air duct by adjusting the fourth flow regulating valve and the fifth flow regulating valve to make T6 equal to T; S40, real-time monitoring of T6, calibration of the fourth flow regulating valve and the fifth flow regulating valve, to achieve constant temperature heating.

2. The temperature control method of the air collector heating system according to claim 1, characterized in that: In step S30, T4*Q1+T5*Q2=T*Q; Q1+Q2=Q; Where: Q1 is the air volume in the air supply duct without mixing with return air, Q2 is the air volume in the temperature control duct, and Q is the air volume in the air supply duct after mixing with return air; Through the above formula, according to the real-time temperatures of T4 and T5, the preset temperature of the supply air temperature T, and the preset supply air volume Q, Q1 and Q2 are calculated to preliminarily determine the opening of the fourth flow control valve and the fifth flow control valve; In step S40, the temperature value of T6 is monitored every 1 minute, and when T6>T, the opening of the fourth flow regulating valve is reduced and the opening of the fifth flow regulating valve is increased; When T6<T, the opening degree of the fourth flow rate regulating valve is increased, and the opening degree of the fifth flow rate regulating valve is decreased.

3. The temperature control method of the air collector heating system according to claim 2, characterized in that: The supply air temperature T is 38℃-42℃.

4. The temperature control method of the air collector heating system according to claim 1, characterized in that: The node between the temperature control duct and the air supply duct is used as the dividing point, and a hybrid pump is also provided at the position of the air supply duct close to the indoor air supply outlet; In executing step S30, the hybrid pump needs to be turned on to allow the air in the temperature control duct to enter the air supply duct for mixing.

5. The temperature control method of the air collector heating system according to claim 1, characterized in that: A fresh air duct is connected to the return air duct near the indoor return air outlet, and the fresh air duct is used to connect to the outdoor air inlet. A seventh flow regulating valve is provided on the fresh air duct; Taking the node of the fresh air duct and the return air duct as the dividing point, a sixth flow regulating valve is arranged at a position of the return air duct close to the indoor return air outlet; Also includes, S50, monitoring indoor temperature t, indoor PM2.5 and indoor C02 concentration through air quality and temperature monitor; S60, when the indoor temperature t<16℃, or the indoor temperature t is between 16-24℃, and PM2.5≤50μg / m3, CO2 concentration≤1000PPm, the system starts the closed cycle heating mode, the seventh flow regulating valve is closed to prevent the mixing of outdoor cold air, and the sixth flow regulating valve is opened to realize indoor air circulation heating; When 75 μg / m 3 <PM2.5<150μg / m 3 Or 1000ppm<CO2 concentration<2000ppm, the system starts the semi-fresh air heating mode, the sixth flow regulating valve and the seventh flow regulating valve are half opened at the same time, and the fresh air and indoor air are mixed into the return air duct in a 1:1 ratio; When PM2.5≥150μg / m 3 Or when the C02 concentration is ≥2000ppm, the sixth flow regulating valve is closed and the seventh flow regulating valve is opened. Fresh air is used for heating and a slight positive pressure is maintained in the heating room.

6. The temperature control method of the air collector heating system according to claim 1, characterized in that: The air supply duct and the return air duct are connected to a switching duct at a position close to the air heat collector, and a third flow regulating valve is provided on the switching duct; Taking the node of the switching duct and the air supply duct as the dividing point, a first flow regulating valve is arranged at a position of the air supply duct close to the air outlet of the air collector, and a heat storage module is arranged at a position of the air supply duct far from the air outlet of the air collector; Taking the node between the switching duct and the return air duct as the dividing point, a second flow regulating valve is arranged at a position of the return air duct close to the return air outlet of the air collector.

7. The temperature control method of the air collector heating system according to claim 6, characterized in that: The heat storage module is a phase change heat storage device. A heating wire is also arranged inside the heat storage module. The phase change temperature of the phase change heat storage material of the heat storage module is 45-50°C.

8. The temperature control method of the air collector heating system according to claim 7, characterized in that: In step S20, when the system is in the air collector independent heating mode, the outlet temperature T2 of the air collector is ≥ 45°C, the air collector meets the heating conditions, the first flow regulating valve and the second flow regulating valve are opened, and the third flow regulating valve is closed. After being heated by the air collector, the air enters the room through the air supply duct, and the indoor air returns to the air collector through the return air duct to continue heating. When the indoor temperature t is lower than the set temperature by more than 10°C, or it enters the off-peak period, or the electric auxiliary heating is manually turned on, the system enters the air collector combined with electric auxiliary heating heating mode, the first flow regulating valve and the second flow regulating valve are opened, the third flow regulating valve is closed, the heating wire of the heat storage module is turned on, and the air enters the heat storage module after passing through the air collector and continues to be heated under the heating wire. Part of the heat is stored in the phase change material of the heat storage module, and the remaining heat enters the air supply duct with the hot air; Monitor the inlet temperature T1 and outlet temperature T2 of the air collector. When T2-T1≤5℃ and T2<45℃, the air collector does not meet the heating conditions, and the system enters the heat storage module heating mode. The first flow regulating valve and the second flow regulating valve are closed, and the third flow regulating valve is opened. The air enters the heat storage module and is heated by the phase change material and / or the heating wire to form hot air that enters the air supply duct. When the indoor temperature t reaches the set requirement, the heating system stops supplying heat to the room, T2≥45℃, the air collector stores heat in non-heating mode, the third flow regulating valve, the sixth flow regulating valve and the seventh flow regulating valve are closed, the first flow regulating valve, the second flow regulating valve, the fourth flow regulating valve and the fifth flow regulating valve are opened, the air enters the air collector and heats up before entering the heat storage module, storing the heat in the phase change material, and the air after heat exchange enters the air collector again to collect heat, and the cycle continues until T2-T3≤1℃, and the heat storage module completes heat storage.

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