Solar energy hetero-phase plate heat pump air conditioning system for bus and control method

Abstract

A solar hetero-state plate heat pump air conditioning system for bus and a control method, comprising a solar hetero-state plate, one end of the solar hetero-state plate is connected to an air conditioning main circuit through a solar plate electronic expansion valve, the air conditioning main circuit comprises an outdoor core, a main circuit expansion valve and an indoor core connected in series; wherein the indoor core is connected to a first end of a four-way valve, and the outdoor core is connected to a second end of the four-way valve; the other end of the solar hetero-state plate is connected to the second end of the four-way valve through an electromagnetic valve; a third end of the four-way valve is connected to a gas-liquid separator, the gas-liquid separator is connected to a low-pressure side of a compressor, and a high-pressure side of the compressor is connected to a fourth end of the four-way valve. The application amplifies the solar heat through the air conditioning system to improve the heating capacity, and the system principle has the advantages of simple structure and easy realization, and has been applied to products.

Description

Technical Field

[0001] This invention relates to a solar heterogeneous plate heat pump air conditioning system and control method for buses. Background Technology

[0002] Currently, there are few product options available in the bus air conditioning industry for heating in cold regions. Conventional electric air conditioners will stop working when the ambient temperature is low. In-vehicle heating is provided by PTC or fuel heaters. PTC has high power consumption and low energy efficiency, which has a significant impact on the vehicle's range. Fuel heaters have high fuel costs and high carbon emissions, which have a significant impact on the environment.

[0003] In summary, automotive air conditioning systems using pure PTC heating consume a lot of energy and have a significant impact on the vehicle's range.

[0004] Existing heating systems on the market that use oil-fired heaters have high carbon emissions and negatively impact the environment. Summary of the Invention

[0005] The technical problem to be solved by this invention is: how to solve the problem of insufficient heating capacity in low-temperature areas of existing conventional air conditioners, while taking into account functions such as high-temperature cooling, normal-temperature cooling, normal-temperature heating, low-temperature heating, and defrosting. This invention provides a solar heterogeneous plate heat pump air conditioning system and control method for buses.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: A solar heterogeneous heat pump air conditioning system for buses includes a solar heterogeneous panel. One end of the solar heterogeneous panel is connected to the main air conditioning circuit via a solar panel electronic expansion valve. The main air conditioning circuit includes an outdoor core, a main circuit expansion valve, and an indoor core connected in series. The indoor core is connected to the first end of a four-way valve, and the outdoor core is connected to the second end of the four-way valve. The other end of the solar heterogeneous panel is connected to the second end of the four-way valve via a solenoid valve. The third end of the four-way valve is connected to the gas-liquid separator, which is connected to the low-pressure side of the compressor, while the high-pressure side of the compressor is connected to the fourth end of the four-way valve.

[0007] A sunlight sensor is installed on the solar heterogeneous plate.

[0008] A two-way dryer filter is connected to the refrigerant outlet side of the outdoor core, and a two-way filter is connected to the refrigerant inlet side of the indoor core.

[0009] The solenoid valve is also connected to a PT sensor, which is used to collect the pressure and temperature of the refrigerant in this pipeline.

[0010] A defrosting temperature sensor is installed on the outdoor core.

[0011] A control method for a solar-powered heterogeneous plate heat pump air conditioning system for buses. The refrigeration control method is: When the air conditioning system is in cooling mode, the refrigerant is discharged from the compressor, passes through the outdoor core, and enters the second expansion valve for throttling. At this time, the solenoid valve is in the closed state, the solar panel electronic expansion valve of the solar heterogeneous plate is in the open state, and the solenoid valve is in the closed state. The main expansion valve is adjusted according to the superheat of the circuit. After the refrigerant is throttled, it enters the indoor core, passes through the heat exchanger, returns to the gas-liquid separator, and finally returns to the compressor.

[0012] The heating control method is: Step 1: When the air conditioning system is in heating mode, the ambient temperature is divided into different zones, and each temperature zone corresponds to a light intensity, establishing a correspondence between temperature zones and light intensity; after the system is turned on, the solenoid valve is initially in the open state, and the solar panel electronic expansion valve of the solar heterogeneous plate is in the closed state. Step 2: After the system runs for time T1, the sunlight sensor detects the current light intensity G. 测 And the current ambient temperature and the current light intensity G. 测 When the light intensity exceeds the temperature range corresponding to the current temperature zone, open the electronic expansion valve of the solar panel to the initial opening. Step 3: After maintaining the initial opening of the solar panel electronic expansion valve for a certain period of time, adjust the opening of the main circuit expansion valve according to the superheat of this circuit; Step 4: When G is detected for consecutive time intervals T2 测 When the light intensity is less than the light intensity corresponding to the temperature range, the electronic expansion valve of the solar panel is closed.

[0013] Step 5 is also included: When the defrost temperature sensor detects that the outdoor core or solar heterogeneous panel needs defrosting, the air conditioning system enters the defrost mode, the four-way valve reverses, the solenoid valve opens, and the main expansion valve and the solar panel electronic expansion valve maintain a certain fixed opening. After defrosting is completed, the heating state is restored.

[0014] The ambient temperature range of -15℃ to 20℃ is divided into four zones, T. a T b T c Among them, -15℃ < T a ≤-5℃, -5℃<T b ≤5℃, 5℃<T c ≤15℃, T d >15℃.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention solves the problem of insufficient heating at low ambient temperatures. By absorbing solar heat and amplifying it through an air conditioning system, the heating capacity is increased. The principle of this system is simple and easy to implement, and it has already been applied to products.

[0016] 1. Improve energy efficiency and user comfort by utilizing solar energy through solar heterogeneous panels.

[0017] 2. This invention solves the refrigerant storage problem during cooling and heating by adding a solenoid valve to the air conditioning system. 3. Precise control of the heat pump system by dividing temperature ranges and solar radiation intensity results in higher energy efficiency, greater energy savings, more precise operation and regulation, and higher reliability.

[0018] 4. The defrosting function of the solar heterogeneous panels is achieved through the control of the solenoid valve and the electronic expansion valve. 5. This invention can realize the functions of high-temperature cooling, normal-temperature cooling, high-temperature heating, normal-temperature heating, low-temperature heating, and defrosting in air conditioning systems. Attached Figure Description

[0019] Figure 1 This is a refrigeration cycle diagram of the air conditioning system of the present invention; Figure 2 This is a diagram of the heating cycle of the air conditioning system of the present invention. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0022] like Figure 1 , Figure 2As shown, a solar heterogeneous plate heat pump air conditioning system for buses includes a solar heterogeneous plate 1. One end of the solar heterogeneous plate 1 is connected to the air conditioning main circuit through a solar panel electronic expansion valve 2. The air conditioning main circuit includes an outdoor core 8, a main circuit expansion valve 10, and an indoor core 4 connected in series. The indoor core 4 is connected to the first end of a four-way valve 5, and the outdoor core 8 is connected to the second end of the four-way valve 5. The other end of the solar heterogeneous plate 1 is connected to the second end of the four-way valve 5 through a solenoid valve 14. That is, the other end of the solar heterogeneous plate 1 is connected between the outdoor core 8 and the four-way valve 5.

[0023] The third end of the four-way valve 5 is connected to the gas-liquid separator 7, which is connected to the low-pressure side of the compressor 6. The high-pressure side of the compressor 6 is connected to the fourth end of the four-way valve 5.

[0024] Furthermore, a sunlight sensor 11 is installed on the solar heterogeneous plate 1.

[0025] Furthermore, a bidirectional dryer filter 9 is connected to the refrigerant outlet side of the outdoor core 8, and a bidirectional filter 3 is connected to the refrigerant inlet side of the indoor core 4.

[0026] It should be noted that the connection point between the solar panel electronic expansion valve 2 and the air conditioning main circuit is between the main circuit expansion valve 10 and the bidirectional filter 3 of the indoor core 4.

[0027] Furthermore, the solenoid valve 14 is also connected to a PT sensor 13, which is used to collect the pressure and temperature of the refrigerant in this pipeline.

[0028] Furthermore, a defrost temperature sensor 12 is installed on the outdoor core 8.

[0029] The working principle of this invention is: This invention uses a solar heterogeneous plate 1 to absorb solar energy and convert it into heat energy, which is then transferred to the air conditioning system to increase the system's heat exchange capacity. A sunlight sensor 11 senses the light intensity and controls the opening and closing of the solar heterogeneous plate 1 in different temperature ranges. Different light intensities are calibrated through bench testing to control the opening and closing of the solar heterogeneous plate 1 at different temperatures. The opening degree of the solar panel electronic expansion valve 2 is controlled by the superheat of the outlet of the solar heterogeneous plate 1.

[0030] like Figure 1 As shown, the cooling control method of the solar heterogeneous plate heat pump air conditioning system for buses in this invention is as follows: When the air conditioning system is in cooling mode, the refrigerant is discharged from the compressor 6, passes through the outdoor core 8, and enters the second expansion valve 10 for throttling. At this time, the solenoid valve 14 is in the closed state, the solar panel electronic expansion valve 2 of the solar heteropolymer panel 1 is in the open state, the solenoid valve 14 is in the closed state, the main expansion valve 10 is adjusted according to the superheat of the circuit, and after the refrigerant is throttled, it enters the indoor core 4, passes through the heat exchanger, returns to the gas-liquid separator 7, and finally returns to the compressor 6.

[0031] like Figure 2 As shown, the heating control method of the solar heterogeneous plate heat pump air conditioning system for buses in this invention is as follows: Step 1: When the air conditioning system is in heating mode, use an ambient temperature sensor to collect the ambient temperature and divide the ambient temperature into different zones T. a T b T c For example, -15℃ to 20℃ is divided into -15℃ < T a ≤-5℃, -5℃<T b ≤5℃, 5℃<T c ≤15℃, T d >15℃, each temperature zone corresponds to a light intensity G a G b G c Then, establish the correspondence between temperature range and light intensity. After power-on, solenoid valve 14 is initially in the open state, and solar panel electronic expansion valve 2 of solar heteropolymer panel 1 is in the closed state.

[0032] Step 2: After the system runs for time T1, the sunlight sensor 11 detects the current light intensity G. 测 And the current ambient temperature and the current light intensity G. 测 When the light intensity exceeds the temperature range corresponding to the area, the electronic expansion valve 2 of the solar panel (e.g., G) is opened. 测 ≥G a To the initial opening degree; Step 3: After maintaining the initial opening of the solar panel electronic expansion valve 2 for a certain period of time, adjust the opening of the main circuit expansion valve 10 according to the overheating of this circuit. Step 4: When G is detected for consecutive time intervals T2 测 When the light intensity is less than the light intensity corresponding to the temperature range, close the solar panel electronic expansion valve 2 (e.g., G). 测 <G a ).

[0033] It also includes step 5: when the defrost temperature sensor 12 detects that the outdoor core 8 or the solar heterogeneous panel 1 has a defrost requirement, the air conditioning system enters the defrost mode, the four-way valve 5 reverses, the solenoid valve 14 opens, the main expansion valve 10 and the solar panel electronic expansion valve 2 maintain a certain fixed opening, and the heating state is restored after the defrost is completed.

[0034] In this process, the solar panel electronic expansion valve 2, the main expansion valve 10, the solenoid valve 14, the four-way valve 5, the compressor 6, the PT sensor 13, the sunlight sensor 11, and the defrost temperature sensor 12 are all connected to the air conditioner controller, which controls the above-mentioned heating and cooling control methods.

[0035] Therefore, this invention possesses functions such as low-temperature heating, cooling, and defrosting. Through this invention and its control method, the air conditioning system collects solar energy via a solar heterogeneous plate for heating and can also perform intelligent defrosting, improving user comfort.

[0036] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present invention, and these should also be considered within the scope of protection of the present invention.

Claims

1. A solar-powered heterogeneous plate heat pump air conditioning system for buses, characterized in that: The system includes a solar heterogeneous plate (1), one end of which is connected to the air conditioning main circuit via a solar panel electronic expansion valve (2). The air conditioning main circuit includes an outdoor core (8), a main circuit expansion valve (10), and an indoor core (4) connected in series. The indoor core (4) is connected to the first end of a four-way valve (5), and the outdoor core (8) is connected to the second end of the four-way valve (5). The other end of the solar heterogeneous plate (1) is connected to the second end of the four-way valve (5) via a solenoid valve (14). The third end of the four-way valve (5) is connected to the gas-liquid separator (7), the gas-liquid separator (7) is connected to the low-pressure side of the compressor (6), and the high-pressure side of the compressor (6) is connected to the fourth end of the four-way valve (5). A control method for a solar heterogeneous plate heat pump air conditioning system for buses, wherein the cooling control method is: When the air conditioning system is in cooling mode, after the refrigerant is discharged from the compressor (6), it passes through the outdoor core (8) and enters the second expansion valve (10) for throttling. At this time, the solenoid valve (14) is closed, the solar panel electronic expansion valve (2) of the solar heteropolymer plate (1) is open, the solenoid valve (14) is closed, the main expansion valve (10) is adjusted according to the superheat of the circuit, and after the refrigerant is throttled, it enters the indoor core (4), passes through the heat exchanger and returns to the gas-liquid separator (7), and finally returns to the compressor (6). The heating control method is: Step 1: When the air conditioning system is in heating mode, the ambient temperature is divided into different zones, and each temperature zone corresponds to a light intensity, establishing the correspondence between temperature zones and light intensity; after the machine is turned on, the solenoid valve (14) is initially in the open state, and the solar panel electronic expansion valve (2) of the solar heteropolymer plate (1) is in the closed state. Step 2: After the system runs for time T1, the sunlight sensor (11) detects the current light intensity G. 测 And the current ambient temperature and the current light intensity G. 测 When the light intensity is greater than that corresponding to the temperature range, open the electronic expansion valve (2) of the solar panel to the initial opening degree; Step 3: After the initial opening of the solar panel electronic expansion valve (2) is maintained for a certain period of time, the opening of the main expansion valve (10) is adjusted according to the overheating of the circuit. Step 4: When G is detected for consecutive time intervals T2 测 When the light intensity is less than the light intensity corresponding to the temperature range, the electronic expansion valve of the solar panel is closed (2).

2. The solar heterogeneous plate heat pump air conditioning system for buses according to claim 1, characterized in that: A sunlight sensor (11) is installed on the solar heteropolymer panel (1).

3. The solar heterogeneous plate heat pump air conditioning system for buses according to claim 1, characterized in that: A two-way dryer filter (9) is connected to the refrigerant outlet side of the outdoor core (8), and a two-way filter (3) is connected to the refrigerant inlet side of the indoor core (4).

4. The solar heterogeneous plate heat pump air conditioning system for buses according to claim 1, characterized in that: The solenoid valve (14) is also connected to a PT sensor (13), which is used to collect the pressure and temperature of the refrigerant in the pipeline.

5. A solar-powered heterogeneous plate heat pump air conditioning system for buses according to claim 1, characterized in that: A defrost temperature sensor (12) is installed on the outdoor core (8).

6. The solar heterogeneous plate heat pump air conditioning system for buses according to claim 1, characterized in that: It also includes step 5: when the defrost temperature sensor (12) detects that the outdoor core (8) or the solar heterogeneous plate (1) has a defrost requirement, the air conditioning system enters the defrost mode, the four-way valve (5) reverses, the solenoid valve (14) opens, the main expansion valve (10) and the solar panel electronic expansion valve (2) maintain a certain fixed opening, and the heating state is restored after the defrost is completed.

7. A solar-powered heterogeneous plate heat pump air conditioning system for buses according to claim 1, characterized in that: The ambient temperature range of -15℃ to 20℃ is divided into four zones, T. a T b T c Among them, -15℃ < T a ≤-5℃, -5℃<T b ≤5℃, 5℃<T c ≤15℃, T d >15℃.

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