Heat dissipating capacity calculation method and device of fuel cell system, electronic equipment and medium

Abstract

The invention provides a heat dissipating capacity calculation method and device of a fuel cell system, electronic equipment and a medium, and is applied to the field of fuel cell cooling modules.The method comprises the steps that the cooling air flow and the cooling air inlet flow speed of the fuel cell system and the real-time rotating speed of a fan are obtained; calculating a heat calculation parameter of the fuel cell system according to the cooling air flow and the cooling air inlet flow rate; and calculating the heat dissipation power of the fuel cell system according to the heat calculation parameter and the real-time rotating speed of the fan, and calculating the heat dissipation capacity of the fuel cell system according to the heat dissipation power. The method can solve the problem that the heat dissipation power of the cooling module cannot be mastered in real time in the test process of the research and development stage of the fuel cell system, the heat dissipation amount can be calculated online in real time by using the calculation method, the calculation amount is small, the calculation precision is high, and an auxiliary effect is provided for heat management strategy verification.

Description

Technical Field

[0001] The present application relates to the field of fuel cell cooling modules, and more specifically, to a method, device, electronic device and medium for calculating heat dissipation of a fuel cell system in the field of fuel cell cooling modules. Background Art

[0002] Fuel cells, as devices that convert hydrogen energy into electrical energy, have been widely used in passenger cars, buses, logistics vehicles and other fields in recent years. The main factors affecting the performance of hydrogen fuel cell stacks include flow, humidity, pressure and temperature, among which the stability of temperature mainly depends on the control and operation of the thermal management subsystem. Generally, the catalyst inside the hydrogen fuel cell stack is prone to failure at high temperatures, and its operating temperature generally does not exceed 80°C, while the temperature difference between the inlet and outlet of the coolant is generally not greater than 10°C. When the fuel cell is supplying power, a large amount of heat will be generated. If this part of the heat is not dissipated in time, it will affect the operation of the fuel cell. Therefore, a cooling module is set around the fuel cell, including an intercooler, an air compressor and a controller. The cooling module is the main way to manage the thermal management of the fuel cell system and plays an important role in the performance, life and safety of the stack. Therefore, during the testing process in the research and development stage of the fuel cell system, it is necessary to grasp the heat dissipation power of the cooling module in real time to enhance the thermal management strategy of the fuel cell.

[0003] In related technologies, modeling and simulation technology is generally used. For example, software such as GT-SUIT is used to simulate the thermal management of a fuel vehicle. By establishing a one-dimensional thermal management simulation model, inputting performance parameters and boundary parameters and solving them, the engine temperature and coolant flow are evaluated.

[0004] However, due to the complexity of the thermal management system of hydrogen fuel cell vehicles, the existing thermal management simulation models are unable to calculate the real-time heating power of the fuel cell stack; although there are a variety of simulation software on the market, the results between the software are difficult to achieve compatible operation, which needs to be solved urgently. Summary of the invention

[0005] The present application provides a method, device, electronic device and medium for calculating the heat dissipation of a fuel cell system. The method can solve the problem of being unable to grasp the heat dissipation power of a cooling module in real time during the testing process at the research and development stage of the fuel cell system. The calculation method can be used to calculate the heat dissipation online in real time with a small amount of calculation and high calculation accuracy, thus providing auxiliary effects on the verification of thermal management strategies.

[0006] In a first aspect, a method for calculating heat dissipation of a fuel cell system is provided, the method comprising the following steps:

[0007] Obtaining the cooling air flow rate, cooling air inlet flow rate and real-time fan speed of the fuel cell system;

[0008] Calculating a heat calculation parameter of the fuel cell system according to the cooling air flow rate and the cooling air inlet flow rate; and

[0009] The heat dissipation power of the fuel cell system is calculated according to the heat calculation parameter and the real-time rotation speed of the fan, and the heat dissipation amount of the fuel cell system is calculated according to the heat dissipation power.

[0010] Through the above technical solution, the heat dissipation power of the cooling module of the fuel cell system can be calculated online in real time with small calculation amount and high calculation accuracy, which provides auxiliary role in the verification of thermal management strategy.

[0011] In combination with the first aspect, in some possible implementations, obtaining the cooling air flow rate, the cooling air inlet flow rate, and the real-time speed of the fan of the fuel cell system includes:

[0012] Obtain coolant mass flow rate, coolant specific heat capacity, coolant inlet temperature, coolant outlet temperature, cooling air inlet temperature, cooling air outlet temperature, air constant pressure specific heat, air density, blade tip speed ratio and fan blade maximum radius;

[0013] Calculate the cooling air flow rate according to the coolant mass flow rate, the coolant specific heat capacity, the coolant inlet temperature, the coolant outlet temperature, the air constant pressure specific heat, the cooling air inlet temperature, the cooling air outlet temperature and the air density;

[0014] The cooling air inlet flow rate is calculated based on the real-time rotation speed of the fan, the maximum radius of the fan blades and the tip speed ratio.

[0015] In combination with the first aspect and the above implementation manner, in some possible implementation manners, calculating the cooling air flow rate according to the coolant mass flow rate, the coolant specific heat capacity, the coolant inlet temperature, the coolant outlet temperature, the air constant pressure specific heat, the cooling air inlet temperature, the cooling air outlet temperature and the air density includes:

[0016] Calculating a first difference between the coolant inlet temperature and the coolant outlet temperature, and calculating a first product of the first difference, the coolant mass flow rate, and the coolant specific heat capacity;

[0017] Calculating a second difference between the cooling air inlet temperature and the cooling air outlet temperature, and calculating a second product of the second difference, the air constant pressure specific heat, and the air density;

[0018] The cooling air flow rate is obtained according to a ratio of the first product to the second product.

[0019] In combination with the first aspect and the above implementation manner, in some possible implementation manners, calculating the cooling air inlet flow rate according to the real-time rotation speed of the fan, the maximum radius of the fan blade and the tip speed ratio includes:

[0020] Calculating the fan blade angular velocity according to the real-time rotation speed of the fan;

[0021] A third product of the fan blade angular velocity and the maximum radius of the fan blade is calculated, and the cooling air inlet flow rate is obtained according to a ratio of the third product to the tip speed ratio.

[0022] In combination with the first aspect and the above implementations, in some possible implementations, calculating the heat dissipation power of the fuel cell system according to the heat calculation parameter and the real-time rotation speed of the fan includes:

[0023] Based on a preset relationship between fan speed and heat dissipation power, the heat dissipation power of the fuel cell system is calculated according to the heat calculation parameter and the real-time speed of the fan, wherein the preset relationship between fan speed and heat dissipation power is:

[0024]

[0025] Among them, P h is the heat dissipation power, R is the maximum radius of the fan blade, S air is the heat calculation parameter, λ is the tip speed ratio, c air is the specific heat of air at constant pressure, T cout is the cooling air outlet temperature, T cin is the cooling air inlet temperature, ρ air is the air density, n c is the preset fan speed.

[0026] In combination with the first aspect and the above implementations, in some possible implementations, calculating the heat calculation parameter of the fuel cell system according to the cooling air flow rate and the cooling air inlet flow rate includes:

[0027] The heat calculation parameter is obtained according to a ratio of the cooling air flow rate to the cooling air inlet flow rate.

[0028] In a second aspect, a device for calculating heat dissipation of a fuel cell system is provided, the device comprising:

[0029] An acquisition module, used to acquire the cooling air flow rate, cooling air inlet flow rate and real-time speed of the fan of the fuel cell system;

[0030] A first calculation module, configured to calculate a heat calculation parameter of the fuel cell system according to the cooling air flow rate and the cooling air inlet flow rate; and

[0031] The second calculation module is used to calculate the heat dissipation power of the fuel cell system according to the heat calculation parameter and the real-time rotation speed of the fan, and calculate the heat dissipation amount of the fuel cell system according to the heat dissipation power.

[0032] Optionally, in some possible implementations, the acquisition module includes:

[0033] An acquisition unit, used to acquire coolant mass flow, coolant specific heat capacity, coolant inlet temperature, coolant outlet temperature, cooling air inlet temperature, cooling air outlet temperature, air constant pressure specific heat, air density, blade tip speed ratio and fan blade maximum radius;

[0034] a first calculation unit, configured to calculate the cooling air flow rate according to the coolant mass flow rate, the coolant specific heat capacity, the coolant inlet temperature, the coolant outlet temperature, the air constant pressure specific heat, the cooling air inlet temperature, the cooling air outlet temperature and the air density;

[0035] The second calculation unit is used to calculate the cooling air inlet flow rate according to the real-time rotation speed of the fan, the maximum radius of the fan blades and the tip speed ratio.

[0036] Optionally, in some possible implementations, the first computing unit is specifically configured to:

[0037] Calculating a first difference between the coolant inlet temperature and the coolant outlet temperature, and calculating a first product of the first difference, the coolant mass flow rate, and the coolant specific heat capacity;

[0038] Calculating a second difference between the cooling air inlet temperature and the cooling air outlet temperature, and calculating a second product of the second difference, the air constant pressure specific heat, and the air density;

[0039] The cooling air flow rate is obtained according to a ratio of the first product to the second product.

[0040] Optionally, in some possible implementations, the second computing unit is specifically configured to:

[0041] Calculating the fan blade angular velocity according to the real-time rotation speed of the fan;

[0042] A third product of the fan blade angular velocity and the maximum radius of the fan blade is calculated, and the cooling air inlet flow rate is obtained according to a ratio of the third product to the tip speed ratio.

[0043] Optionally, in some possible implementations, the second computing module is specifically configured to:

[0044] Based on a preset relationship between fan speed and heat dissipation power, the heat dissipation power of the fuel cell system is calculated according to the heat calculation parameter and the real-time speed of the fan, wherein the preset relationship between fan speed and heat dissipation power is:

[0045]

[0046] Among them, P h is the heat dissipation power, R is the maximum radius of the fan blade, S air is the heat calculation parameter, λ is the tip speed ratio, c air is the specific heat of air at constant pressure, T cout is the cooling air outlet temperature, T cin is the cooling air inlet temperature, ρ air is the air density, n c is the preset fan speed.

[0047] Optionally, in some possible implementations, the first computing module is specifically configured to:

[0048] The heat calculation parameter is obtained according to a ratio of the cooling air flow rate to the cooling air inlet flow rate.

[0049] In a third aspect, an electronic device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method in the first aspect or any possible implementation manner of the first aspect.

[0050] In a fourth aspect, a computer-readable storage medium is provided, which stores a computer program code. When the computer program code runs on a computer, the computer executes the method in the above-mentioned first aspect or any possible implementation manner of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 is a flow chart of a method for calculating heat dissipation of a fuel cell system provided in an embodiment of the present application;

[0052] Figure 2 is a schematic diagram of a fuel cell system cooling module according to an embodiment of the present application;

[0053] Figure 3 is a block diagram of a heat dissipation calculation device for a fuel cell system provided in an embodiment of the present application;

[0054] Figure 4 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0055] The technical solution in the present application will be described clearly and in detail below in conjunction with the accompanying drawings. In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B: "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0056] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as suggesting or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0057] Fuel cells (Proton Exchange Membrane Fuel Cell, PEMFC for short) are called the fourth continuous power generation method that can continuously generate electricity after hydropower, thermal power and nuclear power. They have many technical advantages that traditional thermal power generation cannot match. They do not go through the thermal engine Carnot cycle process but directly convert the chemical energy of the fuel into electrical energy, and then drive the vehicle through the motor. When the internal combustion engine drives the generator, its efficiency is only 30% to 40%; while the efficiency of fuel cells can reach 50% to 60%. Its outstanding advantage is to reduce pollution emissions. For hydrogen fuel cells, the only product after power generation is water, which can achieve zero pollution. PEMFC's superior performance in low-temperature rapid start-up and specific power energy conversion efficiency makes it the preferred power source for vehicles. Since the electrolyte uses a polymer membrane, it has the advantages of simple structure, fast start-up, and normal temperature operation. It is most suitable for providing pollution-free power supply for vehicles such as automobiles. The heat dissipation of PEMFC fuel cell stacks is the main factor affecting the performance, life and operation safety of fuel cells, and is also one of the research and development focuses of the next generation of fuel cell technology.

[0058] During the testing process of the traditional fuel cell system development stage, GT-SUIT and other software can be used to simulate the thermal management of the fuel vehicle. By establishing a one-dimensional thermal management simulation model, inputting performance parameters and boundary parameters and solving them, the engine temperature and coolant flow rate can be evaluated. Due to the complexity of the thermal management system of hydrogen fuel cell vehicles, the existing thermal management simulation model cannot calculate the real-time heating power of the battery stack; although there are many simulation software on the market, the results of the software are difficult to achieve compatible operation.

[0059] Based on the above problems, an embodiment of the present application provides a method for calculating the heat dissipation of a fuel cell system. This method is applicable to the case where the same speed signal controls multiple fans at the same time. It can solve the problem of not being able to grasp the heat dissipation power of the cooling module in real time during the testing process in the research and development stage of the fuel cell system. This calculation method can be used to calculate the heat dissipation online in real time, with a small amount of calculation and high calculation accuracy, which provides auxiliary role in the verification of thermal management strategies.

[0060] Figure 1 This is a flow chart of a method for calculating heat dissipation of a fuel cell system provided in an embodiment of the present application.

[0061] Before explaining the method for calculating the heat dissipation of the fuel cell system provided in the embodiment of the present application, the structure of the fuel cell cooling module involved in the embodiment of the present application is first explained.

[0062] For example, Figure 2 As shown, a fuel cell stack 9 and a fuel cell system cooling module used in the fuel cell stack 9 are illustrated, and the fuel cell cooling module includes: a cooling air outlet temperature sensor 1, used to provide a real-time online value of the cooling air outlet temperature; a cooling air inlet temperature sensor 2, used to provide a real-time online value of the cooling air inlet temperature; a fan radiator and a fan 3; a coolant flow meter 4, used to provide a real-time online value of the coolant mass flow rate; a coolant inlet temperature sensor 5, used to provide a real-time online value of the coolant inlet temperature; a coolant outlet temperature sensor 6, used to provide a real-time online value of the coolant outlet temperature; a coolant bypass valve 7 and a coolant pump 8.

[0063] Specifically, Figure 1 As shown, the method for calculating the heat dissipation of the fuel cell system includes the following steps:

[0064] Step S101, obtaining the cooling air flow rate, cooling air inlet flow rate and real-time fan speed of the fuel cell system.

[0065] Optionally, in some embodiments, the cooling air flow rate, cooling air inlet flow rate and real-time speed of the fan of the fuel cell system are obtained, including: obtaining the coolant mass flow rate, coolant specific heat capacity, coolant inlet temperature, coolant outlet temperature, cooling air inlet temperature, cooling air outlet temperature, air constant pressure specific heat, air density, tip speed ratio and maximum radius of fan blades; calculating the cooling air flow rate based on the coolant mass flow rate, coolant specific heat capacity, coolant inlet temperature, coolant outlet temperature, air constant pressure specific heat, cooling air inlet temperature, cooling air outlet temperature and air density; calculating the cooling air inlet flow rate based on the real-time speed of the fan, the maximum radius of the fan blades and the tip speed ratio.

[0066] Specifically, combined Figure 1 and Figure 2 In the embodiment of the present application, the mass flow rate of the coolant can be obtained by the coolant flowmeter 4; the specific heat capacity of the coolant is provided by the coolant manufacturer; the coolant inlet temperature can be provided by the coolant inlet temperature sensor 5 to provide its online value; the coolant outlet temperature can be provided by the coolant outlet temperature sensor 6 to provide its online value; the cooling air inlet temperature can be provided by the cooling air inlet temperature sensor 2 to provide its online value; the cooling air outlet temperature can be provided by the cooling air outlet temperature sensor 1 to provide its online value; the constant pressure specific heat of air is a constant, and the constant pressure specific heat of air under standard conditions (0°C, 1 standard atmosphere (1atm)) is 1.004kJ / (kg·°C); the air density is a constant, and under standard conditions, the air density is approximately 1.29kg / m 3 ; The tip speed ratio and the maximum radius of the fan blade are both constant values ​​and can be provided by the fan manufacturer. The cooling air flow rate can be calculated based on the coolant mass flow rate, coolant specific heat capacity, coolant inlet temperature, coolant outlet temperature, air constant pressure specific heat, cooling air inlet temperature, cooling air outlet temperature and air density; the cooling air inlet flow rate can be calculated based on the real-time fan speed, the maximum radius of the fan blade and the tip speed ratio.

[0067] As a possible implementation method, in some embodiments, the cooling air flow rate is calculated based on the coolant mass flow rate, the coolant specific heat capacity, the coolant inlet temperature, the coolant outlet temperature, the air constant pressure specific heat, the cooling air inlet temperature, the cooling air outlet temperature and the air density, including: calculating a first difference between the coolant inlet temperature and the coolant outlet temperature, and calculating a first product of the first difference, the coolant mass flow rate and the coolant specific heat capacity; calculating a second difference between the cooling air inlet temperature and the cooling air outlet temperature, and calculating a second difference, the air constant pressure specific heat and the second product of the air density; obtaining the cooling air flow rate according to the ratio of the first product to the second product.

[0068] Specifically, the first difference between the coolant inlet temperature and the coolant outlet temperature is calculated, and the first product of the first difference, the coolant mass flow rate and the coolant specific heat capacity is calculated, and formula (1) can be obtained:

[0069] P h =c cw (T hin -T hout )·m h ; (1)

[0070] Among them, m h is the coolant mass flow rate, in kg / s, c cw is the specific heat capacity of the coolant, in J / (kg·℃), P his the heat dissipation power, in W, T hin is the coolant inlet temperature, in °C, T hout is the coolant outlet temperature, in °C.

[0071] Further, a second difference between the cooling air inlet temperature and the cooling air outlet temperature is calculated, and a second product of the second difference, the air constant pressure specific heat, and the air density is calculated, as shown in formula (2):

[0072] c air ·(T cout -T cin )·ρ air ; (2)

[0073] Among them, c air is the specific heat of air at constant pressure, in J / (kg·℃), T cin is the cooling air inlet temperature, in °C, T cout is the cooling air outlet temperature, in °C, ρ air is the air density, in kg / m 3 .

[0074] As shown in formula (3), the cooling air flow rate V can be calculated based on the ratio of the first product to the second product: c :

[0075]

[0076] Among them, V c is the cooling air flow rate, in m 3 / s.

[0077] Optionally, in other real-time examples, the cooling air inlet flow rate is calculated based on the real-time speed of the fan, the maximum radius of the fan blades and the tip speed ratio, including: calculating the fan blade angular velocity based on the real-time speed of the fan; calculating the third product of the fan blade angular velocity and the maximum radius of the fan blades, and obtaining the cooling air inlet flow rate based on the ratio of the third product to the tip speed ratio.

[0078] Specifically, the fan blade angular velocity is calculated according to the real-time rotation speed of the fan, as shown in formula (4):

[0079]

[0080] Among them, n c is the real-time speed of the fan, in r / min, which can be obtained through the fan speed feedback signal, ω r is the angular velocity of the fan blades in rad / s.

[0081] The third product of the fan blade angular velocity and the maximum radius of the fan blade is calculated according to formula (5), and the cooling air inlet flow rate is obtained according to the ratio of the third product to the blade tip speed ratio:

[0082]

[0083] Where λ is the tip speed ratio, which is a constant provided by the fan manufacturer, and v c is the cooling air inlet velocity, in m / s.

[0084] Step S102, calculating heat calculation parameters of the fuel cell system according to the cooling air flow rate and the cooling air inlet flow rate.

[0085] Optionally, in some embodiments, calculating the heat calculation parameter of the fuel cell system according to the cooling air flow rate and the cooling air inlet flow rate includes: obtaining the heat calculation parameter according to the ratio of the cooling air flow rate to the cooling air inlet flow rate.

[0086] Specifically, as shown in formula (6), the heat calculation parameter S can be obtained according to the ratio of the cooling air flow rate and the cooling air inlet flow rate: air :

[0087]

[0088] Among them, S air It is a dimensionless heat calculation parameter. When the fuel cell system operates at different power densities, the heat calculation parameter is not much different.

[0089] For example, the fuel cell system operates at 0.5 electrical density. At this time, the coolant flow meter 4 can measure the coolant mass flow m h =1.3kg / s, specific heat capacity of coolant c cw =3.5×10 3 J / (kg·℃), the coolant inlet temperature sensor 5 and the coolant outlet temperature sensor 6 measure T hin -T hout = 8°C, cooling air outlet temperature sensor 1 and cooling air inlet temperature sensor 2 measure T cout -T cin =25℃, air constant pressure specific heat c air =1.004×10 3 J / (kg·℃), air density ρ air =1.09kg / m 3 , tip speed ratio λ = 2.6, maximum fan blade radius R = 0.2m, fan speed n c =1250r / min, from this, we can calculate S air ≈0.132.

[0090] Step S103, calculating the heat dissipation power of the fuel cell system according to the heat calculation parameter and the real-time rotation speed of the fan, and calculating the heat dissipation amount of the fuel cell system according to the heat dissipation power.

[0091] Optionally, in some embodiments, calculating the heat dissipation power of the fuel cell system according to the heat calculation parameter and the real-time speed of the fan includes: calculating the heat dissipation power of the fuel cell system according to the heat calculation parameter and the real-time speed of the fan based on a preset relationship between the fan speed and the heat dissipation power, wherein the preset relationship between the fan speed and the heat dissipation power is:

[0092]

[0093] Among them, P h is the heat dissipation power, R is the maximum radius of the fan blade, S air is the heat calculation parameter, λ is the tip speed ratio, c air is the specific heat of air at constant pressure, T cout is the cooling air outlet temperature, T cin is the cooling air inlet temperature, ρ air is the air density, n c The preset fan speed.

[0094] That is to say, the heat calculation parameter S calculated based on the above steps is air , a preset relationship between fan speed and heat dissipation power can be established, as shown in formula (7). According to the heat calculation parameters and the real-time speed of the fan, the heat dissipation power of the fuel cell system can be calculated.

[0095] Furthermore, according to the calculated heat dissipation power of the fuel cell system and the heat dissipation time of the fuel cell system, the heat dissipation amount of the fuel cell system can be calculated, as shown in formula (8).

[0096] Q h =P h ·t; (8)

[0097] Among them, Q h is the heat dissipation amount, and t is the heat dissipation time.

[0098] It should be noted that, in addition to formula (8), there are many other ways to calculate the heat dissipation according to the heat dissipation power, such as integral calculation, etc., which are only exemplified here and are not specifically limited.

[0099] In summary, by obtaining the cooling air flow rate, cooling air inlet flow rate and real-time speed of the fan of the fuel cell system, the present application can calculate the heat calculation parameters of the fuel cell system according to the cooling air flow rate and cooling air inlet flow rate; and can also calculate the heat dissipation power of the fuel cell system according to the heat calculation parameters and the real-time speed of the fan. Therefore, this method can solve the problem of not being able to grasp the heat dissipation power of the cooling module in real time during the testing process in the research and development stage of the fuel cell system. The calculation method can be used to calculate the heat dissipation in real time online, with small calculation amount and high calculation accuracy, which provides auxiliary effect for the verification of thermal management strategy.

[0100] Figure 3 It is a block diagram of a heat dissipation calculation device for a fuel cell system provided in an embodiment of the present application.

[0101] For example, Figure 3 As shown, the heat dissipation calculation device 10 of the fuel cell system may include: an acquisition module 100 , a first calculation module 200 and a second calculation module 300 .

[0102] The acquisition module 100 is used to acquire the cooling air flow rate, cooling air inlet flow rate and real-time speed of the fan of the fuel cell system;

[0103] A first calculation module 200, for calculating heat calculation parameters of the fuel cell system according to the cooling air flow rate and the cooling air inlet flow rate; and

[0104] The second calculation module 300 is used to calculate the heat dissipation power of the fuel cell system according to the heat calculation parameter and the real-time rotation speed of the fan, and calculate the heat dissipation amount of the fuel cell system according to the heat dissipation power.

[0105] Optionally, in some embodiments, the acquisition module 100 includes:

[0106] An acquisition unit, used to acquire coolant mass flow, coolant specific heat capacity, coolant inlet temperature, coolant outlet temperature, cooling air inlet temperature, cooling air outlet temperature, air constant pressure specific heat, air density, blade tip speed ratio and fan blade maximum radius;

[0107] A first calculation unit is used to calculate the cooling air flow rate according to the coolant mass flow rate, the coolant specific heat capacity, the coolant inlet temperature, the coolant outlet temperature, the air constant pressure specific heat, the cooling air inlet temperature, the cooling air outlet temperature and the air density;

[0108] The second calculation unit is used to calculate the cooling air inlet flow rate according to the real-time rotation speed of the fan, the maximum radius of the fan blades and the tip speed ratio.

[0109] Optionally, in some embodiments, the first computing unit is specifically configured to:

[0110] Calculating a first difference between a coolant inlet temperature and a coolant outlet temperature, and calculating a first product of the first difference, a coolant mass flow rate, and a coolant specific heat capacity;

[0111] Calculating a second difference between the cooling air inlet temperature and the cooling air outlet temperature, and calculating a second product of the second difference, the air constant pressure specific heat, and the air density;

[0112] The cooling air flow rate is obtained according to the ratio of the first product to the second product.

[0113] Optionally, in some embodiments, the second computing unit is specifically configured to:

[0114] Calculate the fan blade angular velocity based on the real-time fan speed;

[0115] The third product of the fan blade angular velocity and the maximum radius of the fan blade is calculated, and the cooling air inlet flow rate is obtained according to the ratio of the third product to the tip speed ratio.

[0116] Optionally, in some embodiments, the second calculation module 300 is specifically configured to:

[0117] Based on the preset relationship between fan speed and heat dissipation power, the heat dissipation power of the fuel cell system is calculated according to the heat calculation parameter and the real-time speed of the fan, wherein the preset relationship between fan speed and heat dissipation power is:

[0118]

[0119] Among them, P h is the heat dissipation power, R is the maximum radius of the fan blade, S air is the heat calculation parameter, λ is the tip speed ratio, c air is the specific heat of air at constant pressure, T cout is the cooling air outlet temperature, T cin is the cooling air inlet temperature, ρ air is the air density, n c The preset fan speed.

[0120] Optionally, in some embodiments, the first calculation module 200 is specifically configured to:

[0121] The heat calculation parameter is obtained according to the ratio of the cooling air flow rate and the cooling air inlet flow rate.

[0122] It should be noted that the above explanation of the embodiment of the method for calculating the heat dissipation of a fuel cell system is also applicable to the device for calculating the heat dissipation of a fuel cell system of this embodiment, and will not be repeated here.

[0123] In summary, by obtaining the cooling air flow rate, cooling air inlet flow rate and real-time speed of the fan of the fuel cell system, the present application can calculate the heat calculation parameters of the fuel cell system according to the cooling air flow rate and cooling air inlet flow rate; and can also calculate the heat dissipation power of the fuel cell system according to the heat calculation parameters and the real-time speed of the fan. Therefore, this method can solve the problem of not being able to grasp the heat dissipation power of the cooling module in real time during the testing process in the research and development stage of the fuel cell system. The calculation method can be used to calculate the heat dissipation in real time online, with small calculation amount and high calculation accuracy, which provides auxiliary effect for the verification of thermal management strategy.

[0124] Figure 4 It is a structural schematic diagram of an electronic device provided in an embodiment of the present application.

[0125] It should be understood that the above-described method can be applied to Figure 4 In an electronic device of the structure shown.

[0126] In addition, an embodiment of the present application also protects a device, which may include a memory 401 and a processor 402, wherein the memory 401 stores an executable program code, and the processor 402 is used to call and execute the executable program code to execute the heat dissipation calculation method of the fuel cell system provided in the embodiment of the present application.

[0127] Furthermore, the electronic device also includes: a communication interface 403 for communication between the memory 401 and the processor 402 .

[0128] It should be understood that the device provided in this embodiment is used to execute the above-mentioned method for calculating the heat dissipation of a fuel cell system, and thus can achieve the same effect as the above-mentioned implementation method.

[0129] In the case of an integrated unit, the device may include a processing module and a storage module. When the device is applied to an electronic device, the processing module may be used to control and manage the actions of the electronic device. The storage module may be used to support the electronic device to execute mutual program codes, etc.

[0130] The processing module may be a processor 402 or a controller, which may implement or execute various exemplary logic blocks, modules and circuits disclosed in the present application. The processor 402 may also be a combination that implements a computing function, such as a combination of one or more microprocessors, a combination of digital signal processing and a microprocessor, etc. The storage module may be a memory 401.

[0131] In addition, the device provided in the embodiments of the present application may specifically be a chip, a component or a module, and the chip may include a connected processor 402 and a memory 401; wherein the memory 401 is used to store instructions, and when the processor 402 calls and executes the instructions, the chip can execute the heat dissipation calculation method of the fuel cell system provided in the above embodiments.

[0132] This embodiment also provides a computer-readable storage medium, in which a computer program code is stored. When the computer program code is executed on a computer, the computer executes the above-mentioned related method steps to implement the method for calculating the heat dissipation of the fuel cell system provided in the above embodiment.

[0133] Among them, the device, computer-readable storage medium or chip provided in this embodiment is used to execute the corresponding method provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding method provided above, and will not be repeated here.

[0134] Through the description of the above implementation methods, technical personnel in the relevant field can understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0135] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0136] The above contents are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for calculating heat dissipation of a fuel cell system, characterized in that: The following steps are involved: Obtaining the cooling air flow rate, cooling air inlet flow rate and real-time fan speed of the fuel cell system; Calculating a heat calculation parameter of the fuel cell system according to the cooling air flow rate and the cooling air inlet flow rate; as well as The heat dissipation power of the fuel cell system is calculated according to the heat calculation parameter and the real-time rotation speed of the fan, and the heat dissipation amount of the fuel cell system is calculated according to the heat dissipation power.

2. The method according to claim 1, characterized in that The step of obtaining the cooling air flow rate, cooling air inlet flow rate and real-time speed of the fan of the fuel cell system includes: Obtain coolant mass flow rate, coolant specific heat capacity, coolant inlet temperature, coolant outlet temperature, cooling air inlet temperature, cooling air outlet temperature, air constant pressure specific heat, air density, blade tip speed ratio and fan blade maximum radius; Calculate the cooling air flow rate according to the coolant mass flow rate, the coolant specific heat capacity, the coolant inlet temperature, the coolant outlet temperature, the air constant pressure specific heat, the cooling air inlet temperature, the cooling air outlet temperature and the air density; The cooling air inlet flow rate is calculated based on the real-time rotation speed of the fan, the maximum radius of the fan blades and the tip speed ratio.

3. The method according to claim 2, characterized in that The step of calculating the cooling air flow rate according to the coolant mass flow rate, the coolant specific heat capacity, the coolant inlet temperature, the coolant outlet temperature, the air constant pressure specific heat, the cooling air inlet temperature, the cooling air outlet temperature and the air density comprises: Calculating a first difference between the coolant inlet temperature and the coolant outlet temperature, and calculating a first product of the first difference, the coolant mass flow rate, and the coolant specific heat capacity; Calculating a second difference between the cooling air inlet temperature and the cooling air outlet temperature, and calculating a second product of the second difference, the air constant pressure specific heat, and the air density; The cooling air flow rate is obtained according to a ratio of the first product to the second product.

4. The method according to claim 2, characterized in that: The step of calculating the cooling air inlet flow rate according to the real-time rotation speed of the fan, the maximum radius of the fan blades and the tip speed ratio comprises: Calculating the fan blade angular velocity according to the real-time rotation speed of the fan; A third product of the fan blade angular velocity and the maximum radius of the fan blade is calculated, and the cooling air inlet flow rate is obtained according to a ratio of the third product to the tip speed ratio.

5. The method according to claim 2, characterized in that: The step of calculating the heat dissipation power of the fuel cell system according to the heat calculation parameter and the real-time rotation speed of the fan includes: Based on a preset relationship between fan speed and heat dissipation power, the heat dissipation power of the fuel cell system is calculated according to the heat calculation parameter and the real-time speed of the fan, wherein the preset relationship between fan speed and heat dissipation power is: Among them, P h is the heat dissipation power, R is the maximum radius of the fan blade, S air is the heat calculation parameter, λ is the tip speed ratio, c air is the specific heat of air at constant pressure, T cout is the cooling air outlet temperature, T cin is the cooling air inlet temperature, ρ air is the air density, n c is the preset fan speed.

6. The method according to claim 1, characterized in that The step of calculating the heat calculation parameters of the fuel cell system according to the cooling air flow rate and the cooling air inlet flow rate comprises: The heat calculation parameter is obtained according to a ratio of the cooling air flow rate to the cooling air inlet flow rate.

7. A heat dissipation calculation device for a fuel cell system, characterized in that: include: An acquisition module, used to acquire the cooling air flow rate, cooling air inlet flow rate and real-time speed of the fan of the fuel cell system; A first calculation module, configured to calculate a heat calculation parameter of the fuel cell system according to the cooling air flow rate and the cooling air inlet flow rate; as well as The second calculation module is used to calculate the heat dissipation power of the fuel cell system according to the heat calculation parameter and the real-time rotation speed of the fan, and calculate the heat dissipation amount of the fuel cell system according to the heat dissipation power.

8. The device according to claim 7, characterized in that The acquisition module comprises: An acquisition unit, used to acquire coolant mass flow, coolant specific heat capacity, coolant inlet temperature, coolant outlet temperature, cooling air inlet temperature, cooling air outlet temperature, air constant pressure specific heat, air density, blade tip speed ratio and fan blade maximum radius; a first calculation unit, configured to calculate the cooling air flow rate according to the coolant mass flow rate, the coolant specific heat capacity, the coolant inlet temperature, the coolant outlet temperature, the air constant pressure specific heat, the cooling air inlet temperature, the cooling air outlet temperature and the air density; The second calculation unit is used to calculate the cooling air inlet flow rate according to the real-time rotation speed of the fan, the maximum radius of the fan blades and the tip speed ratio.

9. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method for calculating heat dissipation of a fuel cell system as described in any one of claims 1 to 6.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the method for calculating the heat dissipation of a fuel cell system as described in any one of claims 1 to 6.

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