Data collection experiment device of small low-temperature power generation module and safety protection method

Abstract

The invention discloses a data collection experiment device of a small low-temperature power generation module and a safety protection method, and belongs to the technical field of low-temperature power generation simulation experiments. The data collection experiment device comprises an ORC power generation module, a heat source simulation module, an inversion grid-connected module, an electronic load adjusting module, a storage battery charging module and a detection control module, controls the on-off of a corresponding circuit breaker and a relay, adjusts the resistance value of an electronic load and the frequency of a frequency converter, and controls the on-off of the storage battery charging module. And the opening degree of the throttle valve is manually adjusted, and experimental data is fitted, so that the following five different teaching modes and control methods thereof can be realized: a grid-connected teaching mode, a load teaching mode, a storage battery charging teaching mode, a grid-connected power stable output teaching mode and a variable working medium teaching mode. And secondly, the evaporator and the condenser related to the device can be better maintained and cleaned in the later period, and the stability of the fixed equipment can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of low-temperature power generation simulation experiments, and more specifically, to a data collection experimental device and a safety protection method for a small-scale low-temperature power generation module. Background Art

[0002] The energy generated by fossil energy is relatively stable, reliable and controllable, but fossil energy is non-renewable and unsustainable. The use of fossil energy has also caused a series of problems, such as greenhouse effect, damage to air quality, acid rain and impact on human health. Based on the crisis and drawbacks of the use of fossil energy, it is urgent to strengthen the development and application of new energy and the cultivation of relevant talents. Renewable energy is widely distributed in nature and can be obtained sustainably, such as solar energy, hydropower, wind energy, biomass energy, ocean temperature difference energy and geothermal energy. Organic Rankine Cycle (ORC) system, includes a working fluid pump, evaporator, expander, generator and air-cooled condenser; the evaporator transfers external heat energy to the system, such as solar energy, geothermal energy and industrial waste heat, and the liquid working fluid in the evaporator absorbs external heat energy and changes into a high-temperature and high-pressure gaseous working fluid; the expander converts the high-temperature and high-pressure heat energy carried by the gaseous working fluid into mechanical energy, the generator converts the mechanical energy into electrical energy, the gaseous working fluid is converted into liquid working fluid after passing through the air-cooled condenser, and then the working fluid pump sends the liquid working fluid into the evaporator.

[0003] The geothermal energy heat source diversion system in the CN115680810A patent allows the continuous utilization of geothermal energy, and the expander steam extraction system can cleverly compensate for the power consumption of the working fluid pump in the ORC system. However, the patent ignores the convenience of automatic control during system operation and the patent does not explain the energy storage method after the generator generates electricity.

[0004] Patent CN115559797A provides a medium-low temperature ORC waste heat power generation system, which uses a phase change heat storage module to improve the quality of the waste heat source and maintain a stable heating capacity. However, the system in this patent lacks an effective control method and does not study the impact of resistive loads on the system's power generation performance.

[0005] Patent CN113883029A discloses a photothermal and waste heat coupled power generation system that can improve power generation efficiency and is equipped with a dust cleaning device, but the patent ignores the impact of different experimental working fluids on the performance of the power generation system.

[0006] Patent CN115324672A provides a low-grade waste heat ORC power generation system with an online exhaust device, which can timely discharge the non-condensable gas generated during system operation while generating electricity, but the patent ignores the grid connection function after power generation.

[0007] Patent CN111980766A provides an ultra-low temperature waste heat power generation system and ultra-low temperature waste heat power generation equipment, which can realize hot water power generation above 80°C, and can realize heat source power generation above 10°C after changing to a low-temperature working fluid, but the patent lacks an effective automatic control strategy for stable power output.

[0008] In addition, the existing small-scale low-temperature power generation simulation experimental devices usually use evaporators and air-cooled condensers to adjust the temperature of the experimental environment to a certain extent. However, there are some significant problems in the actual application of evaporators and air-cooled condensers. First of all, in terms of subsequent maintenance, evaporators and air-cooled condensers show obvious disadvantages. Due to the complexity of their structure and the precision of internal components, the maintenance process becomes very time-consuming and laborious. For example, the heat exchange tubes of the evaporator may be scaled due to long-term operation, and professionals are required to perform careful cleaning and descaling operations. This not only takes a lot of time, but also requires professional equipment and technology. The fan and heat sink of the air-cooled condenser are also prone to accumulate dust and debris, affecting the heat dissipation effect, and cleaning these dust and debris is not easy. In addition, for the replacement and maintenance of some internal parts, the entire device needs to be disassembled and reassembled, which undoubtedly causes many troubles in actual use. Secondly, the existing air-cooled evaporator and air-cooled condenser often produce vibrations of a certain frequency during actual use. And such vibrations often cause the fixed fixing bolts to shift and loosen due to resonance. These looseness will further aggravate the instability of the device, and may cause problems such as increased noise and reduced operating efficiency. Over time, the loosening of the fixing bolts may cause gaps in the connections between components, thereby affecting the efficiency of heat exchange. In severe cases, it may even cause damage to components, increasing maintenance costs and downtime. In addition, due to the loosening of the fixing bolts, the device may be displaced during operation, which will not only affect its positional accuracy in the experimental device, but may also cause pulling and damage to the pipes and lines connected to it, thereby causing safety hazards. In summary, the maintenance difficulties and vibration-induced loosening of the fixing bolts in the evaporator and air-cooled condenser in the existing small-scale low-temperature power generation simulation experimental device have seriously affected the normal operation and use effect of the experimental device, and further improvement and optimization are urgently needed.

[0009] In view of this, we propose a data collection experimental device and safety protection method for a small low-temperature power generation module. Summary of the invention

[0010] 1. Technical issues to be solved

[0011] The present invention aims at teaching and experimental practice, and provides a small-scale low-temperature power generation simulation experiment control and a control method thereof. A heat source simulation module is used to simulate low-temperature heat sources of different temperatures such as solar energy, geothermal energy, and industrial waste heat. A throttle valve (S4) is used to adjust the mass flow of the experimental working fluid. By controlling the on and off of corresponding circuit breakers and relays, adjusting the resistance of an electronic load (12) and the frequency of a frequency converter (5), and manually adjusting the opening of the throttle valve (S4), fitting the experimental data, and replacing different types of experimental working fluids, the present invention can realize the following five different teaching modes and control methods thereof: a grid-connected teaching mode and a control method thereof, a load teaching mode and a control method thereof, and a storage teaching mode and a control method thereof. Battery charging teaching mode and its control method, grid-connected power stable output teaching mode and its control method, variable working fluid teaching mode and its control method, teachers can choose different teaching modules according to different teaching needs to achieve different teaching objectives; students can deepen their understanding of the principles of low-temperature thermal power generation in experimental learning, and cultivate more talents for the field of new energy. The small-scale low-temperature power generation simulation experimental device includes an ORC power generation module, a heat source simulation module, an inverter grid-connected module, an electronic load adjustment module, a battery charging module and a detection control module; the ORC power generation module and the heat source simulation module both use copper tubes with an outer diameter of 22mm and a wall thickness of 1.2mm.

[0012] 2. Technical solution

[0013] A data collection experimental device and safety protection method for a small low-temperature power generation module, such as Figure 1-2 As shown:

[0014] The ORC power generation module comprises a heat source simulation module, a throttle valve (S4) connected to the outlet of a compressor (4) in the heat source simulation module, an expander (6) connected to the throttle valve (S4), a generator (9) and a rotary valve (S5) connected to the expander (6), an air-cooled condenser (7) connected to the rotary valve (S5), and an inlet on the D1 side of a thermal economizer (3) in the heat source simulation module connected to the air-cooled condenser (7); the throttle valve (S4) functions to: The mass flow rate of the experimental working fluid in the experimental device is regulated; the generator (9) is used to convert mechanical energy into 24V three-phase alternating current; the rotary valve (S5) is used to prevent the working fluid therein from flowing when the experimental device stops running; the air-cooled condenser (7) contains an air-cooled condenser fan (8), and the air-cooled condenser fan (8) is used to transfer the heat of the gaseous experimental working fluid to the surrounding environment; the temperature sensors (T7, T8) are used to detect the experimental working fluid at the inlet and outlet of the expander (6) respectively. temperature; pressure sensors (P3, P4) are used to detect the pressure of the experimental working fluid at the inlet and outlet of the expander (6); the mass flow sensor (M2) is used to detect the mass flow of the experimental working fluid at the outlet of the expander (6); the speed instrument (R) is used to detect the speed of the generator (9); the temperature sensors (T9, T10) are used to detect the temperature of the experimental working fluid at the inlet and outlet of the air-cooled condenser (7); the pressure sensors (P5, P6) are used to detect the pressure of the experimental working fluid at the inlet and outlet of the air-cooled condenser (7); the mass flow sensor (M3) is used to detect the mass flow of the experimental working fluid at the outlet of the air-cooled condenser (7); the temperature sensors (AT3, AT4) are used to detect the temperature of the air at the inlet and outlet of the air-cooled condenser fan (8); the mass flow sensor (AM2) is used to detect the mass flow of the air at the inlet of the air-cooled condenser fan (8); the temperature sensor (ET) is used to detect the ambient temperature around the experimental device; the humidity sensor (EH) is used to detect the ambient humidity around the experimental device;

[0015] The heat source simulation module comprises a heat economizer (3), a sight glass (24) connected to the D2 side outlet of the heat economizer (3), an air-cooled evaporator (1) connected to the sight glass (24), a first solenoid valve (S1) and a second solenoid valve (S2) connected to the air-cooled evaporator (1), an F1 side inlet of the heat economizer (3) connected to the first solenoid valve (S1), and a compressor (4) connected to the F2 side outlet of the heat economizer (3) and the second solenoid valve (S2); the function of the rotary valve (S3) is to replace the experimental working fluid in the experimental device (the experimental working fluid selected in this experimental device is R134A, R410A, R404 A); the first solenoid valve (S1) and the second solenoid valve (S2) are used to control the direction of the experimental working fluid in the device; the sight glass (24) is used to observe the state of the experimental working fluid at the inlet of the air-cooled evaporator (1); the air-cooled evaporator (1) contains an evaporator fan (2), and the function of the evaporator fan (2) is to transfer heat from the surrounding environment to the experimental working fluid; the function of the thermal economizer (3) is to transfer heat from the D1-D2 side to the F1-F2 side; the temperature sensor (T11) is used to detect the temperature of the experimental working fluid at the inlet of the D1 side of the thermal economizer (3); the temperature sensor (T12) is used to detect the temperature of the experimental working fluid at the outlet of the D2 side of the thermal economizer (3); The pressure sensor (P7) is used to detect the pressure of the experimental working fluid at the outlet of the D2 side of the thermal economizer (3); the temperature sensors (T1, T2) are used to detect the temperature of the experimental working fluid at the inlet and outlet of the air-cooled evaporator (1); the pressure sensors (P8, P9) are used to detect the pressure of the experimental working fluid at the inlet and outlet of the air-cooled evaporator (1); the mass flow sensor (M1) is used to detect the mass flow of the experimental working fluid at the inlet of the air-cooled evaporator (1); the temperature sensors (AT1, AT2) are used to detect the temperature of the air at the inlet and outlet of the evaporator fan (2); the mass flow sensor (AM1) is used to detect the flow rate of the experimental working fluid at the inlet of the evaporator fan (2); The mass flow rate of air at the inlet of the heat economizer (3); the temperature sensor (T3) is used to detect the temperature of the experimental working fluid at the inlet of the F1 side of the heat economizer (3); the temperature sensor (T4) is used to detect the temperature of the experimental working fluid at the outlet of the F2 side of the heat economizer (3); the pressure sensor (P10) is used to detect the pressure of the experimental working fluid at the inlet of the F1 side of the heat economizer (3); the pressure sensor (P11) is used to detect the pressure of the experimental working fluid at the outlet of the F2 side of the heat economizer (3); the pressure sensors (P1, P2) are used to detect the pressure of the experimental working fluid at the inlet and outlet of the compressor (4); the temperature sensors (T5, T6) are used to detect the temperature of the experimental working fluid at the inlet and outlet of the compressor (4);

[0016] The inverter grid-connected module comprises a three-phase circuit breaker (K1) connected to the generator (9), a first relay (KM1) connected to the three-phase circuit breaker (K1), a grid-connected inverter (10) connected to the first relay (KM1), and a mains supply connected to the grid-connected inverter (10); the circuit breaker (K1) and the first relay (KM1) control the on-off of the inverter grid-connected module circuit; the grid-connected inverter (10) is used to convert the three-phase alternating current generated by the generator (9) into 220V alternating current, which then flows to the mains supply; the power sensor (W1) is used to detect the generated power after grid connection;

[0017] The electronic load adjustment module comprises a three-phase circuit breaker (K2) connected to the generator (9), a second relay (KM2) connected to the three-phase circuit breaker (K2), a three-phase rectifier bridge (11) connected to the second relay (KM2), and an electronic load (12) connected to the three-phase rectifier bridge (11); the circuit breaker (K2) and the second relay (KM2) are used to control the on and off of the circuits between the electronic load adjustment modules; the rectifier bridge (11) is used to convert the 24V three-phase alternating current generated by the generator (9) into direct current for resistive load experiments; the voltage sensor (U1) is used to detect the voltage at both ends of the electronic load; the current sensor (I1) is used to detect the current in the electronic load; the electronic load (12) is used to change the resistance value of 20-90Ω to study the power generation of the generator (9);

[0018] The battery charging module comprises a three-phase circuit breaker (K3) connected to the generator (9), a third relay (KM3) connected to the three-phase circuit breaker (K3), a charging controller (13) connected to the third relay (KM3), and a battery (14) connected to the charging controller (13); the circuit breaker (K3) and the third relay (KM3) are used to control the on and off of the circuits between the battery charging modules; the charging controller (13) is used to store the three-phase alternating current generated by the generator (9) in a 24V battery (14); the voltage sensor (U2) is used to detect the charging voltage of the battery (14); the current sensor (I2) is used to detect the charging current of the battery (14); and the battery detector (C) is used to detect the remaining power of the battery (14);

[0019] like Figure 1-3 As shown:

[0020] The detection control module is mainly composed of a switch (23), MCGS (18), Huichuan controller H3s-2416MR / T-XP (17) and H3s-1616MR / T-XP (16), which communicate with each other through an Ethernet RJ45 interface; ports (1, 2, 5) of the switch (23) are respectively connected to the controller H3s-1616MR / T-XP (16), MCGS (18) and the controller H3s-2416MR / T-XP (17) The analog input points (X00-X17, 16 in total) of the controller H3s-1616MR / T-XP (16) are respectively connected to the temperature sensor (T1-T12, 12 in total) and the pressure sensor (P1-P4, 4 in total); the controller H3s-1616MR / T-XP (16) is respectively connected to the expansion modules AM600-4AD (19) and AM600-4DA (20) through the corresponding interfaces; the analog input points of AM600-AD (19) are respectively connected to the temperature sensor (T1-T12, 12 in total) and the pressure sensor (P1-P4, 4 in total); the analog input points of AM600-AD (19) are ... The analog input points (CH0, CH3) of the AM600-DA (20) are connected to the electronic load (12) and the frequency converter (5) respectively; the analog output points (CH0, CH3) of the AM600-DA (20) are connected to the electronic load (12) and the frequency converter (5) respectively; the analog input points (X00-X27, a total of 24) of the controller H3s-2416MR / T-XP (17) are connected to the pressure sensor (P5-P11, a total of 7), the air temperature sensor (AT1-AT4, a total of 4), the air A mass flow sensor (AM1, AM2), a mass flow sensor (M1-M3, 3 in total), a voltage sensor (U1, U2), a current sensor (I1, I2), an ambient temperature sensor (ET), an ambient humidity sensor (EH), a tachometer (R) and a battery detector (C) are connected; digital output points (Y00-Y12, 11 in total) of the controller H3s-2416MR / T-XP (17) are respectively connected to relays (KM1-KM11, 11 in total);

[0021] The circuit breaker (K0) serves as the main switch of the experimental device circuit; the circuit breaker (K4) and the relay (KM4) serve to control the on and off of the 380V circuit of the frequency converter (5); the frequency converter (5) is used to adjust the frequency of the compressor (4), that is, when the frequency of the compressor (5) changes, the heat source temperature provided by the heat source simulation module changes accordingly; the rectifier bridge (15) serves to convert the 380V current into 220V alternating current, which is then supplied to the evaporator fan (2), the air-cooled condenser fan (8), the electronic load (12), H3s-1616MR / T-XP (16), H3s-2416MR / T-XP (17), MCGS (18) and switch (23) provide power; the evaporator fan (2) is controlled by relay KM8 to turn on and off the power; the air-cooled condenser fan (8) is controlled by relay KM9 to turn on and off the power; the electronic load (12) is controlled by relay KM10 to turn on and off the power; the switch power supply (22) converts 220V AC power into 24V DC power, which is then supplied to the temperature sensor (T1-T1) after passing through the circuit breaker K6. 12, 12 in total), pressure sensors (P1-P11, 11 in total), mass flow sensors (M1-M3, 3 in total), speed instrument (R), power sensor (W1), voltage sensors (U1, U2), current sensors (I1, I2), solenoid valves (S1, S2), battery tester (C), ambient temperature sensor (ET), ambient humidity sensor (EH), temperature sensors (AT1-AT4, 4 in total) and mass flow sensors (AM1, AM2) are powered; the first solenoid valve (S1) and The second solenoid valve (S2) is controlled to be on and off by the relay KM5 and the relay KM6 respectively; the switch power supply (21) converts the 220V AC power into 24V DC power, and supplies power to AM600-4AD (19), AM600-4DA (20) and the charging controller (13) through the circuit breaker K7; the charging controller (13) is controlled to be on and off by the relay KM7; in addition, when the electric quantity C in the storage battery (14) is greater than 20%, the circuit breaker K8 and the relay KM11 can also be closed to provide power to the 24V experimental device;

[0022] The control method provided by the present invention can realize the following teaching modes by controlling and regulating the ORC power generation module, the heat source simulation module, the inverter grid-connected module, the electronic load adjustment module, the battery charging module and the detection control module:

[0023] (I) Grid-connected teaching mode and its control method

[0024] 1) When the mass flow rate of the working fluid in the experimental device remains unchanged, the influence of the simulated heat source temperature on the grid-connected power is studied, such as Figure 4; Close the circuit breaker K0 to connect the 380V power supply to the entire experimental device; close the circuit breaker K1 and the relay KM1 to close the circuit of the inverter grid-connected module; close the circuit breaker K4 and the relay KM4 to connect the frequency converter (5) and the compressor (4) to the 380V power supply; close the circuit breaker K5, the relays KM8 and KM9 to connect the evaporator fan (2), the air-cooled condenser fan (8), the H3s-1616MR / T-XP (16), the H3s-2416MR / T-XP (17) and the switch (23) to the 220V power supply; close the relays KM5 and KM6 to connect the first power supply to ... The magnetic valve (S1) and the second electromagnetic valve (S2) are both closed; the rotary valve S5 is opened to allow the working fluid in the experimental device to flow; the opening of the throttle valve S4 is manually adjusted to a suitable fixed value; when it is detected that the battery power C is greater than 20%, the circuit breaker K8 and the relay KM11 are closed, otherwise the circuit breaker K6 and the circuit breaker K7 are closed; the frequency of the inverter (5) is adjusted to change the heating capacity of the compressor (4) so ​​that the temperature of the simulated heat source is different under different experimental conditions; the experimental device starts to operate; the difference between the outlet temperature (T12) on the D2 side of the thermal economizer (3) and the outlet temperature (T2) of the air-cooled evaporator (1) is detected like Then disconnect relay KM6 and the second solenoid valve (S2), otherwise, disconnect relay KM5 and the first solenoid valve (S1); test the grid-connected power generation W1; after all data tests are completed, disconnect the circuit breakers (K0-K8, 9 in total) and relays (KM1-KM11, 11 in total), close the rotary valve S5; and stop the experimental device.

[0025] 2) When the simulated heat source temperature provided by the heat source simulation module remains unchanged, the influence of the throttle valve opening on the grid-connected power is studied, such as Figure 4; Close circuit breaker K0 to connect the entire experimental device to a 380V power supply; close circuit breaker K1 and relay KM1 to close the circuit of the inverter grid-connected module; close circuit breaker K4 and relay KM4 to connect the frequency converter (5) and compressor (4) to a 380V power supply; close circuit breaker K5, relays KM8 and KM9 to connect the evaporator fan (2), air-cooled condenser fan (8), H3s-1616MR / T-XP (16), H3s-2416MR / T-XP (17) and switch (23) to a 220V power supply; close relays KM5 and KM6, so that the first solenoid valve (S1) and the second solenoid valve (S2) are both closed; the rotary valve S5 is opened to allow the working fluid in the experimental device to circulate; the opening of the throttle valve (S4) is adjusted so that the mass flow rate of the experimental working fluid is different under different experimental conditions; when the battery power C is detected to be greater than 20%, the circuit breaker K8 and the relay KM11 are closed, otherwise the circuit breaker K6 and the circuit breaker K7 are closed; the frequency converter (5) is set to a fixed value; the experimental device starts to operate; the difference between the outlet temperature (T12) of the D2 side of the thermal economizer (3) and the outlet temperature (T2) of the air-cooled evaporator (1) is detected like >0, disconnect relay KM6 and the second solenoid valve (S2); otherwise, disconnect relay KM5 and the first solenoid valve (S1); test the grid-connected power generation W1; after all data tests are completed, disconnect the circuit breakers (K0-K8, 9 in total) and relays (KM1-KM11, 11 in total), close the rotary valve S5, and stop the experimental device.

[0026] (II) Load teaching mode and its control method

[0027] When the simulated heat source temperature and working fluid mass flow provided by the heat source simulation module remain unchanged, the influence of the resistive load on the power generation of the experimental device is studied, such as Figure 5As shown. Close the circuit breaker K0 to connect the entire experimental device to a 380V power supply; close the circuit breaker K2 and the relay KM2 to close the circuit of the electronic load adjustment module; close the circuit breaker K4 and the relay KM4 to connect the inverter (5) and the compressor (4) to a 380V power supply; close the circuit breaker K5, the relays KM8, KM9 and KM10 to connect the evaporator fan (2), the air-cooled condenser fan (8), the electronic load (12), the H3s-1616MR / T-XP (16), the H3s-2416MR / T-XP (17) and the switch (23) to a 220V power supply; close the relays KM5 and KM6 to connect the first circuit The magnetic valve (S1) and the second electromagnetic valve (S2) are both closed; the rotary valve S5 is opened to allow the working fluid in the experimental device to circulate; the throttle valve (S4) and the frequency converter (5) are respectively fixed in opening and frequency, so that the heat source temperature of the heat source simulation module and the mass flow rate of the experimental working fluid remain unchanged; when the battery power C is greater than 20%, the circuit breaker K8 and the relay KM11 are closed, otherwise the circuit breaker K6 and the circuit breaker K7 are closed; the resistance value of the electronic load (12) is adjusted so that the load resistance value is different under different experimental working conditions; the experimental device starts to operate; and the difference between the outlet temperature (T12) on the D2 side of the thermal economizer (3) and the outlet temperature (T2) of the air-cooled evaporator (1) is detected. like Then disconnect the relay KM6 and the second solenoid valve (S2); conversely, disconnect the relay KM5 and the first solenoid valve (S1); test the voltage (U1) across the electronic load and the current (I1) flowing through the electronic load; after all data tests are completed, disconnect the circuit breakers (K0-K8, 9 in total) and relays (KM1-KM11, 11 in total), and close the rotary valve S5;

[0028] The experimental device stopped operating.

[0029] (III) Battery charging teaching mode and its control method

[0030] 1) When the mass flow rate of the experimental working fluid remains unchanged, the influence of the simulated heat source temperature on the battery charging power is studied, such as Figure 6; Close the circuit breaker K0 to connect the 380V power supply to the entire experimental device; close the circuit breaker K3 and relay KM3 to close the circuit of the battery charging module; close the circuit breaker K4 and relay KM4 to connect the inverter (5) and the compressor (4) to the 380V power supply; close the circuit breaker K5, relays KM8 and KM9 to connect the evaporator fan (2), the air-cooled condenser fan (8), H3s-1616MR / T-XP (16), H3s-2416MR / T-XP (17) and the switch (23) 220V power supply; close relays KM5 and KM6, so that the first solenoid valve (S1) and the second solenoid valve (S2) are both closed; open the rotary valve S5, so that the working medium in the experimental device can flow; manually adjust the opening of the throttle valve S4 to a suitable fixed value; adjust the frequency of the inverter (5) to change the heating capacity of the compressor (4) so ​​that the temperature of the simulated heat source is different under different experimental conditions; start the operation of the experimental device; detect the difference between the outlet temperature (T12) of the D2 side of the thermal economizer (3) and the outlet temperature (T2) of the air-cooled evaporator (1) like Then disconnect the relay KM6 and the second solenoid valve (S2); conversely, disconnect the relay KM5 and the first solenoid valve (S1); test the charging voltage U2 and charging current I2 of the battery (14); after all data tests are completed, disconnect the circuit breakers (K0-K8, 9 in total) and relays (KM1-KM11, 11 in total), close the rotary valve S5; and stop the experimental device.

[0031] 2) When the heat source temperature provided by the heat source simulation module remains unchanged, the effect of the throttle valve opening on the battery charging power is studied, such as Figure 6 ; Close circuit breaker K0 to connect the entire experimental device to a 380V power supply; close circuit breaker K3 and relay KM3 to close the circuit of the battery charging module; close circuit breaker K4 and relay KM4 to connect the inverter (5) and compressor (4) to a 380V power supply; close circuit breaker K5, relays KM8 and KM9 to connect the evaporator fan (2), air-cooled condenser fan (8), H3s-1616MR / T-XP (16), H3s-2416MR / T-XP (17) and exchange The machine (23) is connected to a 220V power supply; the relays KM5 and KM6 are closed, so that the first solenoid valve (S1) and the second solenoid valve (S2) are both closed; the rotary valve S5 is opened, so that the working fluid in the experimental device can flow; the opening of the throttle valve (S4) is adjusted so that the mass flow rate of the working fluid is different under different experimental conditions; the frequency of the frequency converter (5) is adjusted to a suitable fixed value; the experimental device starts to operate; and the difference between the outlet temperature (T12) of the D2 side of the thermal economizer (3) and the outlet temperature (T2) of the air-cooled evaporator (1) is detected. like Then disconnect the relay KM6 and the second solenoid valve (S2); conversely, disconnect the relay KM5 and the first solenoid valve (S1); test the charging voltage U2 and charging current I2 of the battery (14); after all data tests are completed, disconnect the circuit breakers (K0-K8, 9 in total) and relays (KM1-KM11, 11 in total), close the rotary valve S5; and stop the experimental device.

[0032] (IV) Grid-connected power stable output teaching mode and its control method Figure 7 As shown, the power demand needPower and the adjustment accuracy acc are given; the circuit breaker K0 is closed to connect the entire experimental device to a 380V power supply; the circuit breaker K1 and the relay KM1 are closed to close the circuit of the inverter grid-connected module; the circuit breaker K4 and the relay KM4 are closed to connect the frequency converter (5) and the compressor (4) to a 380V power supply; the circuit breaker K5, the relays KM8 and KM9 are closed to connect the evaporator fan (2), the air-cooled condenser fan (8), the H3s-1616MR / T-XP (16), the H3s-2416MR / T-XP (17) and the switch (23) to a 220V power supply; the relays KM5 and KM6, so that the first solenoid valve (S1) and the second solenoid valve (S2) are both closed; the rotary valve S5 is opened to allow the working fluid in the experimental device to flow; the opening of the throttle valve S4 is determined and set to a fixed value opg when the grid-connected power generation is maximum through experiments; when the battery power C is detected to be greater than 20%, the circuit breaker K8 and the relay KM11 are closed, otherwise the circuit breaker K6 and the circuit breaker K7 are closed; the frequency of the inverter (5) is adjusted to change the heating capacity of the compressor (4) so ​​that the temperature of the simulated heat source is different under different experimental conditions; the experimental device starts to operate; the difference between the outlet temperature (T12) on the D2 side of the thermal economizer (3) and the outlet temperature (T2) of the air-cooled evaporator (1) is detected like Then disconnect the relay KM6 and the second electromagnetic valve (S2); conversely, disconnect the relay KM5 and the first electromagnetic valve (S1); adjust the frequency of the inverter (5) and test the maximum value W1_max and the minimum value W1_min of the grid-connected power W1; judge whether W1_min≤needPower≤W1_max, if not, prompt: exceed the demand; if so, assign a value Interpretation If not, the frequency of the frequency converter (5) is reduced by i (i is obtained by fitting the experimental data); if so, the experiment is completed; the circuit breakers (K0-K8, 9 in total) and relays (KM1-KM11, 11 in total) are disconnected, and the rotary valve S5 is closed; the experimental device stops running.

[0033] (V) Teaching mode of variable working fluid and its control method When the working fluid is replaced in the experiment, the power generation efficiency of the device under different working fluids is studied, such as Figure 8 As shown; open the rotary valve S3 to extract the old working fluid in the device; add new working fluid into the device and close the rotary valve S3; close the circuit breaker K0 to connect the 380V power supply to the entire experimental device; close the circuit breaker K1 and the relay KM1 to close the circuit of the inverter grid-connected module; close the circuit breaker K4 and the relay KM4 to connect the frequency converter (5) and the compressor (4) to the 380V power supply; close the circuit breaker K5, the relays KM8 and KM9 to connect the evaporator fan (2), the air-cooled condenser fan (8), H3s-1616MR / T-XP (16), H3s-2416MR / T-XP (1 7) and the switch (23) are connected to a 220V power supply; the relays KM5 and KM6 are closed, so that the first solenoid valve (S1) and the second solenoid valve (S2) are both closed; the rotary valve S5 is opened so that the working medium in the experimental device can flow; the opening of the throttle valve S4 and the frequency of the inverter (5) under different working conditions are set; if the battery power C is greater than 20%, the circuit breaker K8 and the relay KM11 are closed, otherwise the circuit breaker K6 and the circuit breaker K7 are closed; the experimental device starts to operate; the difference between the outlet temperature (T12) on the D2 side of the thermal economizer (3) and the outlet temperature (T2) of the air-cooled evaporator (1) is detected like Then disconnect the relay KM6 and the second solenoid valve (S2), otherwise, disconnect the relay KM5 and the first solenoid valve (S1); calculate the power generation efficiency η under this working condition based on the experimental data of the test; after all data tests are completed, disconnect the circuit breakers (K0-K8, 9 in total) and relays (KM1-KM11, 11 in total), close the rotary valve S5, and stop the experimental device.

[0034] The air-cooled evaporator 1 and the air-cooled condenser 7 used in the device have the same structure. The specific structure of the cold condenser 7 is as follows:

[0035] A condensation tube 720 is arranged inside the air-cooled condenser 7, and fixing plates 730 are arranged on both sides of the air-cooled condenser 7. A plurality of fixing plates 730 are threadedly sleeved with fixing bolts 731 on the tops, and the tops of the fixing bolts 731 are hexagonal. A limit assembly and an anti-loosening assembly are arranged on the top of the air-cooled condenser 7, and the limit assembly includes a threaded rotating rod 710, and the threaded rotating rod 710 is threadedly sleeved on the top of the air-cooled condenser 7, and the outer wall of the threaded rotating rod 710 is fixedly sleeved with a connecting rod. The connecting block 711 has a cavity inside, and the outer walls of both sides of the connecting block 711 are provided with arc pressing blocks 715, and multiple springs 713 are provided on the top of the cavity, and the ends of multiple springs 713 are connected to limit plates 714, and multiple pull rods 712 are provided on the top of the limit plates 714. The two ends of the air-cooled condenser 7 are respectively connected with a clamping plate 1 740 and a clamping plate 2 745, and the side walls of the clamping plate 1 740 and the clamping plate 2 745 are respectively provided with support seats 74 2. A plurality of the support bases 742 are connected with heat dissipation fins 743, and a plurality of the support bases 742 are internally connected with a plug rod 744 for fixing the heat dissipation fins 743. The tops of the first and second clamping plates 740 and 745 are provided with a clamping limit groove 741 matching the limit plate 715. The side wall of the first clamping plate 740 is provided with an air-cooled condenser fan 8. The plurality of anti-loosening components include a mounting block 750, and the side wall of the plurality of mounting blocks 750 is provided with a guide groove. A plurality of sliding blocks 751 are slidably connected inside the guide grooves, a return spring 752 is provided on the outer wall behind the sliding block 751, and the ends of the plurality of return springs 752 are connected to the inner wall of the guide groove, a pressing connecting rod 753 is provided on the outer wall on one side of the sliding block 751, and a connecting block 754 is provided on the outer wall on the other side of the sliding block 751, and L-shaped limit frames 755 are provided on both sides of the connecting block 754, and the plurality of L-shaped limit frames 755 are clamped on both sides of the fixing bolt 731.

[0036] 3. Beneficial effects

[0037] Compared with the prior art, the advantages of the present invention are as follows: 1. The present invention proposes a control method for the experimental device, which can realize five different teaching modes and control methods thereof by turning on and off the corresponding circuit breakers and relays, adjusting the resistance of the electronic load (12) and the frequency of the frequency converter (5), manually adjusting the opening of the throttle valve S4, fitting the experimental data, replacing different types of experimental working fluids, etc.: a grid-connected teaching mode and control method thereof, a load teaching mode and control method thereof, a battery charging teaching mode and control method thereof, a grid-connected power stable output teaching mode and control method thereof, and a variable working fluid teaching mode and control method thereof;

[0038] 2. The present invention provides an automatic adjustment method for the stable output of grid-connected power generation. The adjustment value i in this method is based on experimental fitting, and the adjustment accuracy acc is controllable and very high;

[0039] 3. The present invention uses a copper tube with an outer diameter of 22mm and a wall thickness of 1.2mm, which has the advantages of safe, reliable and good heat transfer; the device is equipped with a sight glass, etc., which is convenient and effective to observe the working medium state at the entrance of the air-cooled evaporator; the present invention designs a set of its own heat source simulation module, absorbs the waste heat in the device through a thermal economizer, and improves the energy utilization rate; uses an air-cooled evaporator to absorb heat in the air, and can effectively utilize the surrounding ambient temperature; uses a compressor to simulate low-temperature heat sources of different temperatures such as solar energy, geothermal energy, and industrial waste heat, so that the output of the heat source is very stable; the experimental working fluids used in the present invention are R134A, R410A and R404A. Based on the experiment, it is concluded that the most suitable working fluid for the device is R410A and the highest grid-connected power generation efficiency is 3.84%;

[0040] 4. When it is necessary to disassemble the heat dissipation fins on the outer wall of the air-cooled condenser, it is only necessary to pull multiple pull rods, and then rotate the connecting block so that the connecting block can be reversed. At this time, since the clamping plate 1 and the clamping plate 2 are separated from the limit of the limit plate, the clamping plate 1 and the clamping plate 2 can be easily disassembled, so that the heat dissipation fins or the air-cooled condenser fan can be more conveniently disassembled, which is convenient for later cleaning and maintenance, greatly improving the convenience of the device. In addition, during the actual use of the device, the multiple L-shaped limit frames can be used to clamp the two sides of the fixing bolt, thereby reducing the air-cooled evaporator and the air-cooled During actual use, the air-cooled condenser may have a problem of loose connections due to vibration. When the air-cooled evaporator and the air-cooled condenser need to be disassembled, the connecting block can be rotated and the arc-shaped pressing blocks on both sides of the connecting block can be used to contact the pressing connecting rod, so that the pressing connecting rod can drive the sliding blocks of multiple anti-loosening components to move. At this time, the multiple sliding blocks can drive their respective L-shaped limit frames to move and release the clamping of the fixing bolts, thereby facilitating personnel to disassemble it. While facilitating personnel to carry out maintenance, it can also better ensure the stability of the air-cooled evaporator and the air-cooled condenser, and reduce the situation where the fixing bolts are offset and loosened due to vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a structural schematic diagram of the device of the present invention;

[0042] Figure 2 is the main circuit diagram of the device of the present invention;

[0043] Figure 3 The electrical schematic diagram of the control system of the present invention;

[0044] Figure 4 This is a control flow chart with the inverter frequency or throttle valve opening as the variable in the grid-connected experiment.

[0045] Figure 5 This is a control flow chart with resistive load as a variable in the load experiment;

[0046] Figure 6 A control flow chart with inverter frequency or throttle valve opening as variable in the battery charging experiment;

[0047] Figure 7 Automatic adjustment flow chart for grid-connected power stable output;

[0048] Figure 8 A control flow chart for calculating power generation efficiency under variable working fluid conditions;

[0049] Fig. 9 This is the temperature entropy diagram of the experimental device when the system is running;

[0050] Fig.10 This is the relationship diagram between the simulated heat source temperature and the generated power;

[0051] Fig.11 It is the relationship diagram between resistive load and power generation;

[0052] Fig.12 This is the relationship diagram between the mass flow rate of the experimental working fluid and the battery charging power;

[0053] Fig.13 It is the linear fitting relationship diagram between grid-connected power and inverter frequency;

[0054] Fig.14 This is the graph showing the change of power generation efficiency when the experimental working fluid is different;

[0055] Fig.15 It is a schematic diagram of the structure of the air-cooled condenser of the present invention;

[0056] Fig.16 This is a schematic diagram of the disassembled structure of the air-cooled condenser of the present invention;

[0057] Fig.17 It is a schematic diagram of the heat dissipation fin installation structure of the present invention;

[0058] Fig.18 It is a schematic diagram of the structure of the limit assembly of the present invention;

[0059] Fig.19 It is a schematic diagram of the structure of the anti-loosening assembly of the present invention;

[0060] Explanation of the numbers in the figure: 1. air-cooled evaporator; 2. evaporator fan; 3. thermal economizer; 4. compressor; 5. inverter; 6. expander; 7. air-cooled condenser; 710. threaded rotating rod; 711. connecting block; 712. pull rod; 713. spring; 714. limit plate; 715. arc pressure block; 720. condenser tube; 730. fixing plate; 731. fixing bolt; 740. clamping plate one; 741. clamping limit groove; 742. supporting clamp seat; 743. heat dissipation fin; 744. plug rod; 745. clamping plate two; 750. mounting block; 751. sliding block; 752. reset spring; 753. pressure connecting rod; 754. connecting block; 755. L-shaped limit frame; 8. air-cooled condenser fan; 9 , generator; 10, grid-connected inverter; 11, the first rectifier bridge; 12, electronic load; 13, charging controller; 14, battery; 16, H3s-1616MR / T-XP; 17, H3s-2416MR / T-XP; 18, MCGS; 19, AM600-4AD; 20, AM600-4DA; 21, the first switching power supply; 22, the second switching power supply; 23, switch; 24, sight glass; S1, the first solenoid valve; S2, the second solenoid valve; S4, the throttle valve; S5, the rotary valve; K1, the first three-phase circuit breaker; KM1, the first relay; K2, the second three-phase circuit breaker; KM2, the second relay; K3, the third three-phase circuit breaker; KM3, the third relay. DETAILED DESCRIPTION

[0061] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0062] In the description of the present invention, “plurality” means two or more than two, unless otherwise clearly and specifically defined.

[0063] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] The present invention is further described below in conjunction with specific embodiments and drawings to help understand the content of the present invention.

[0065] (I) Temperature entropy diagram of the device

[0066] like Figure 4 As shown, the experimental working fluid in the experimental device is R134a;

[0067] Close the circuit breaker K0 to connect the 380V power supply to the entire experimental device; close the circuit breaker K1 and the relay KM1 to close the circuit of the inverter grid-connected module; close the circuit breaker K4 and the relay KM4 to connect the frequency converter (5) and the compressor (4) to the 380V power supply; close the circuit breaker K5, the relays KM8 and KM9 to connect the evaporator fan (2), the air-cooled condenser fan (8), the H3s-1616MR / T-XP (16), the H3s-2416MR / T-XP (17) and the switch (23) to the 220V power supply; close the relays KM5 and KM6 to close the first solenoid valve (S1) and the second solenoid valve (S2); open the rotary valve S5 to allow the working medium in the experimental device to flow;

[0068] The opening of the throttle valve S4 is manually adjusted to a fixed value of 100%;

[0069] Adjust the frequency of the frequency converter (5) to a fixed value of 30 Hz;

[0070] The experimental device started to operate;

[0071] The difference between the outlet temperature (T12) of the D2 side of the thermal economizer (3) of 17.56°C and the outlet temperature (T2) of the air-cooled evaporator (1) of 18.05°C was detected. because Then disconnect the relay KM5 and the first solenoid valve (S1);

[0072] After the data test is completed, disconnect the circuit breakers (K0-K8, 9 in total) and relays (KM1-KM11, 11 in total), and close the rotary valve S5;

[0073] The experimental device stopped operating.

[0074] Fig. 9 This is the temperature entropy diagram of the experimental device under this working condition. The operation process of the system is as follows:

[0075] D1-D2: Liquid working fluid with a temperature higher than the ambient temperature flows into the inlet of the thermal economizer (3) D1, and then flows out from the outlet of the thermal economizer (3) D2.

[0076] E1-F2: the liquid working medium flows into the E1 inlet of the air-cooled evaporator (1), and the air-cooled evaporator (1) absorbs heat from the external heat source environment, so that the working medium flowing out from the E2 outlet of the air-cooled evaporator (1) is changed into a gaseous working medium or a gas-liquid mixed working medium; the gas-liquid mixed working medium flows into the F1 inlet of the thermal economizer (3), and then the F1-F2 side of the thermal economizer (3) absorbs heat, and the working medium flowing out from the F2 outlet of the thermal economizer (3) is completely changed into a gaseous working medium;

[0077] A1-A2: The gaseous working medium flows into the A1 inlet of the compressor (4), and the working medium flowing out from the A2 outlet of the compressor (4) becomes a high-temperature and high-pressure gaseous working medium;

[0078] B1-B2: The high-temperature and high-pressure gaseous working medium enters the B1 inlet of the expander (6), and the high-temperature and high-pressure gaseous working medium converts thermal energy into mechanical energy through the expander (6). The gaseous working medium with a relatively high temperature flows out from the B2 outlet of the expander (6);

[0079] C1-C2: a relatively high temperature gaseous working medium flows into the C1 inlet of the air-cooled condenser (7), and the air-cooled condenser (7) transfers the heat of the gaseous working medium to the surrounding air, so that the working medium flowing out of the C2 outlet of the air-cooled condenser (7) becomes a liquid working medium with a temperature higher than the ambient temperature;

[0080] (II) Teaching experiment under grid-connected mode

[0081] like Figure 4 As shown, the experimental working fluid is R134a. When the mass flow rate of the working fluid in the experimental device remains unchanged, the influence of the simulated heat source temperature on the grid-connected power is studied;

[0082] Close the circuit breaker K0 to connect the 380V power supply to the entire experimental device; close the circuit breaker K1 and the relay KM1 to close the circuit of the inverter grid-connected module; close the circuit breaker K4 and the relay KM4 to connect the frequency converter (5) and the compressor (4) to the 380V power supply; close the circuit breaker K5, the relays KM8 and KM9 to connect the evaporator fan (2), the air-cooled condenser fan (8), the H3s-1616MR / T-XP (16), the H3s-2416MR / T-XP (17) and the switch (23) to the 220V power supply; close the relays KM5 and KM6 to close the first solenoid valve (S1) and the second solenoid valve (S2);

[0083] Open the rotary valve S5 to allow the working fluid in the experimental device to flow;

[0084] The opening of the throttle valve S4 is manually adjusted to a fixed value of 100%;

[0085] Because the battery charge C is less than 20%, circuit breakers K6 and K7 are closed;

[0086] Set the frequency of the inverter (5) to 15 Hz;

[0087] The experimental device started to operate;

[0088] The difference between the outlet temperature (T12) of the D2 side of the thermal economizer (3) of 26.54°C and the outlet temperature (T2) of the air-cooled evaporator (1) of 25.77°C was detected. because Therefore, disconnect relay KM6 and the second solenoid valve (S2);

[0089] The grid-connected power W1 after the test inverter is 11.2W;

[0090] After multiple sets of data are tested, disconnect the circuit breakers (K0-K8, 9 in total) and relays (KM1-KM11, 11 in total), and close the rotary valve S5;

[0091] The experimental device stopped operating.

[0092] Fig.10 The graph of the simulated heat source temperature and power generation when the frequency of the inverter (5) is 15-50Hz shows that the grid-connected power generation increases with the increase of the simulated heat source temperature, and when the simulated heat source temperature is as high as 69.53℃, the grid-connected power generation is as high as 141.7W and the inverter frequency is 50Hz.

[0093] (III) Teaching experiment under load mode

[0094] like Figure 5As shown, the experimental working fluid is R134a. When the simulated heat source temperature and working fluid mass flow rate provided by the heat source simulation module remain unchanged, the influence of the resistive load on the power generation of the experimental device is studied.

[0095] Close the circuit breaker K0 to connect the 380V power supply to the entire experimental device; close the circuit breaker K2 and the relay KM2 to close the circuit of the electronic load adjustment module; close the circuit breaker K4 and the relay KM4 to connect the inverter (5) and the compressor (4) to the 380V power supply; close the circuit breaker K5, the relays KM8, KM9 and KM10 to connect the evaporator fan (2), the air-cooled condenser fan (8), the electronic load (12), the H3s-1616MR / T-XP (16), the H3s-2416MR / T-XP (17) and the switch (23) to the 220V power supply; close the relays KM5 and KM6 to close the first solenoid valve (S1) and the second solenoid valve (S2);

[0096] Open the rotary valve S5 to allow the working fluid in the experimental device to flow;

[0097] The throttle valve (S4) and the frequency converter (5) are respectively set to a fixed opening of 100% and a frequency of 50 Hz, so that the heat source temperature of the heat source simulation module and the mass flow rate of the experimental working fluid remain unchanged;

[0098] Detecting that the power level C of the storage battery (14) is less than 20%, and closing the circuit breakers K6 and K7;

[0099] The resistance value of the electronic load (12) is adjusted to 90Ω for the first time, and then adjusted to 80Ω, 70Ω, 60Ω, 50Ω, 40Ω, and 30Ω in sequence;

[0100] The experimental device started to operate;

[0101] The difference between the outlet temperature (T12) of the D2 side of the thermal economizer (3) of 27.8°C and the outlet temperature (T2) of the air-cooled evaporator (1) of 23.19°C was detected. because Therefore, disconnect relay KM6 and the second solenoid valve (S2);

[0102] The voltage U1 across the test electronic load (12) is 63.8V and the current I1 flowing through the electronic load is 0.709A;

[0103] After the data test is completed, disconnect the circuit breakers (K0-K8, 9 in total) and relays (KM1-KM11, 11 in total), and close the rotary valve S5;

[0104] The experimental device stopped operating.

[0105] Fig.11The figure is a graph showing the change in power generation data when the resistance of the electronic load (12) is 30-90Ω. It can be seen from the figure that the power generation voltage increases with the increase of the electronic load, and the power generation current and power generation power decrease with the increase of the electronic load. When the power generation power is 103W at maximum, the electronic load is 30Ω, the power generation voltage is 55.6V, and the power generation current is 1.853A.

[0106] (IV) Teaching experiment under battery charging mode

[0107] like Figure 6 As shown, the experimental working fluid is R134a. When the heat source temperature provided by the heat source simulation module remains unchanged, the influence of the throttle valve opening on the battery charging power is studied.

[0108] Close the circuit breaker K0 to connect the 380V power supply to the entire experimental device; close the circuit breaker K3 and the relay KM3 to close the circuit of the battery charging module; close the circuit breaker K4 and the relay KM4 to connect the inverter (5) and the compressor (4) to the 380V power supply; close the circuit breaker K5, the relays KM8 and KM9 to connect the evaporator fan (2), the air-cooled condenser fan (8), the H3s-1616MR / T-XP (16), the H3s-2416MR / T-XP (17) and the switch (23) to the 220V power supply; close the relays KM5 and KM6 to close the first solenoid valve (S1) and the second solenoid valve (S2);

[0109] Open the rotary valve S5 to allow the working fluid in the experimental device to flow;

[0110] The frequency of the frequency converter (5) is set to a fixed value of 50 Hz;

[0111] The opening of the throttle valve (S4) is adjusted to 20%, and then the opening is adjusted to 40%, 60%, 80%, and 100% in sequence;

[0112] The experimental device started to operate;

[0113] The difference between the outlet temperature (T12) of the D2 side of the thermal economizer (3) of 36.6°C and the outlet temperature (T2) of the air-cooled evaporator (1) of 15.06°C was detected. because Then disconnect the relay KM6 and the second solenoid valve (S2);

[0114] The charging voltage U2 of the test battery (14) is 24.3V and the charging current I2 is 4.44A;

[0115] After multiple sets of data are tested, disconnect the circuit breakers (K0-K8, 9 in total) and relays (KM1-KM11, 11 in total), and close the rotary valve S5;

[0116] The experimental device stopped operating.

[0117] Fig.12 The figure is a graph showing the charging power of the battery (14) and the mass flow rate of the working fluid when the opening of the throttle valve (S4) is 20-100%. It can be seen from the figure that the charging power of the battery increases with the increase of the mass flow rate of the working fluid, and when the charging power of the battery is at most 140W, the throttle valve opening is 100% and the mass flow rate of the working fluid is 0.03592kg / s;

[0118] (V) Teaching experiment of automatic adjustment of stable power output

[0119] like Figure 7 As shown, the experimental working fluid is R134a;

[0120] Given the power demand needPower=60W, the set adjustment accuracy value acc=2;

[0121] Close the circuit breaker K0 to connect the 380V power supply to the entire experimental device; close the circuit breaker K1 and the relay KM1 to close the circuit of the inverter grid-connected module; close the circuit breaker K4 and the relay KM4 to connect the frequency converter (5) and the compressor (4) to the 380V power supply; close the circuit breaker K5, the relays KM8 and KM9 to connect the evaporator fan (2), the air-cooled condenser fan (8), the H3s-1616MR / T-XP (16), the H3s-2416MR / T-XP (17) and the switch (23) to the 220V power supply; close the relays KM5 and KM6 to close the first solenoid valve (S1) and the second solenoid valve (S2);

[0122] Open the rotary valve S5 to allow the working fluid in the experimental device to flow;

[0123] From experimental data Fig.10 It can be seen that when the grid-connected power generation is maximum, the opening of the throttle valve S4 is 100%, so the opening of the throttle valve S4 is set to a fixed value of opg = 100%;

[0124] Check that the battery power C is greater than 20%, and close the circuit breaker K8 and relay KM11;

[0125] Adjust the frequency of the frequency converter (5) to 15 Hz;

[0126] The experimental device started to operate;

[0127] The difference between the outlet temperature (T12) of the D2 side of the thermal economizer (3) of 26.62°C and the outlet temperature (T2) of the air-cooled evaporator (1) of 25.02°C was detected. because Therefore, disconnect relay KM6 and the second solenoid valve (S2);

[0128] The frequency of the frequency converter (5) is adjusted and the maximum value W1_max of the grid-connected power generation W1 is tested to be 141.7 W and the minimum value W1_min is 11.2 W;

[0129] Because W1_min≤needPower≤W1_max, assign

[0130] because Then the frequency of the frequency converter (5) is adjusted to decrease by i=0.5Hz( Fig.13 The linear fitting shows that when the inverter frequency increases by 1Hz, the grid-connected power increases by 3.786W, so i is set to 0.5);

[0131] like The experiment is completed;

[0132] Disconnect the circuit breakers (K0-K8, 9 in total) and relays (KM1-KM11, 11 in total), and close the rotary valve S5;

[0133] The experimental device stopped operating.

[0134] (VI) Teaching experiment on power generation efficiency under different experimental working fluids

[0135] like Figure 8 As shown, when a new working fluid is replaced in the experiment, the power generation efficiency of the device under different working fluids is studied;

[0136] Open the rotary valve S3 to extract the old working fluid R134A in the device;

[0137] Add new working fluid R404A into the device and close the rotary valve S3;

[0138] Close the circuit breaker K0 to connect the 380V power supply to the entire experimental device; close the circuit breaker K1 and the relay KM1 to close the circuit of the inverter grid-connected module; close the circuit breaker K4 and the relay KM4 to connect the frequency converter (5) and the compressor (4) to the 380V power supply; close the circuit breaker K5, the relays KM8 and KM9 to connect the evaporator fan (2), the air-cooled condenser fan (8), the H3s-1616MR / T-XP (16), the H3s-2416MR / T-XP (17) and the switch (23) to the 220V power supply; close the relays KM5 and KM6 to close the first solenoid valve (S1) and the second solenoid valve (S2);

[0139] Open the rotary valve S5 to allow the working fluid in the experimental device to flow;

[0140] The opening of the throttle valve S4 under this working condition is set to 100% and the frequency of the inverter (5) is set to 40 Hz;

[0141] If the battery power C is less than 20%, the circuit breakers K6 and K7 are closed;

[0142] The experimental device started to operate;

[0143] The difference between the outlet temperature (T12) of the D2 side of the thermal economizer (3) of 23.13°C and the outlet temperature (T2) of the air-cooled evaporator (1) of 21.76°C was detected. because Therefore, disconnect relay KM6 and the second solenoid valve (S2);

[0144] According to the experimental data of the test, the power generation efficiency under this condition is calculated to be η = 2.1812%;

[0145] After the experiment is completed, disconnect the circuit breakers (K0-K8, 9 in total) and relays (KM1-KM11, 11 in total), and close the rotary valve S5;

[0146] The experiment is over.

[0147] Fig.14 The graph shows the change of grid-connected power generation efficiency when the experimental working fluids in the experimental device are R404A, R134A and R410A. In the graph, the grid-connected power generation efficiency of R410A is better than the other two and the highest power generation efficiency is 3.84%.

[0148] like Figure 16-18 As shown:

[0149] The air-cooled evaporator 1 and the air-cooled condenser 7 used in the device have the same structure. The specific structure of the cold condenser 7 is as follows:

[0150] A condensation tube 720 is arranged inside the air-cooled condenser 7, and fixing plates 730 are arranged on both sides of the air-cooled condenser 7. A plurality of fixing plates 730 are threadedly sleeved with fixing bolts 731 on the tops, and the tops of the fixing bolts 731 are hexagonal. A limit assembly and an anti-loosening assembly are arranged on the top of the air-cooled condenser 7, and the limit assembly includes a threaded rotating rod 710, and the threaded rotating rod 710 is threadedly sleeved on the top of the air-cooled condenser 7, and the outer wall of the threaded rotating rod 710 is fixedly sleeved with a connecting rod. The connecting block 711 has a cavity inside, and the outer walls of both sides of the connecting block 711 are provided with arc pressing blocks 715, and multiple springs 713 are provided on the top of the cavity, and the ends of multiple springs 713 are connected to limit plates 714, and multiple pull rods 712 are provided on the top of the limit plates 714. The two ends of the air-cooled condenser 7 are respectively connected with a clamping plate 1 740 and a clamping plate 2 745, and the side walls of the clamping plate 1 740 and the clamping plate 2 745 are respectively provided with support seats 74 2. A plurality of the support bases 742 are connected with heat dissipation fins 743, and a plurality of the support bases 742 are internally connected with a plug rod 744 for fixing the heat dissipation fins 743. The tops of the first and second clamping plates 740 and 745 are provided with a clamping limit groove 741 matching the limit plate 715. The side wall of the first clamping plate 740 is provided with an air-cooled condenser fan 8. The plurality of anti-loosening components include a mounting block 750, and the side wall of the plurality of mounting blocks 750 is provided with a guide groove. A plurality of sliding blocks 751 are slidably connected inside the guide grooves, a return spring 752 is provided on the outer wall behind the sliding block 751, and the ends of the plurality of return springs 752 are connected to the inner wall of the guide groove, a pressing connecting rod 753 is provided on the outer wall on one side of the sliding block 751, and a connecting block 754 is provided on the outer wall on the other side of the sliding block 751, and L-shaped limit frames 755 are provided on both sides of the connecting block 754, and the plurality of L-shaped limit frames 755 are clamped on both sides of the fixing bolt 731.

[0151] The principle of use is: in actual application, when it is necessary to disassemble the heat dissipation fins 743 on the outer wall of the air-cooled condenser 7, the operation process is relatively simple. First, the operator needs to pull multiple pull rods 714. By pulling the pull rods 714, a series of subsequent actions can be triggered, and then the connecting block 711 is rotated to change its direction. When the connecting block 711 is reversed, the limit plate 714 that originally limited the clamping plate 1 740 and the clamping plate 2 745 no longer limits them. In this case, the clamping plate 1 740 and the clamping plate 2 745 can be easily disassembled, thereby making the disassembly of the heat dissipation fins 743 or the air-cooled condenser fan 8 more convenient. Such a design greatly facilitates the cleaning and maintenance of the heat dissipation fins 743 and the air-cooled condenser fan 8 in the later stage, and significantly improves the convenience of the entire device. It is worth noting that the structure of the air-cooled evaporator 1 is the same as that of the air-cooled condenser 7, which means that in the later maintenance and cleaning process, the air-cooled evaporator 1 can also enjoy similar convenient operations. This structural consistency not only reduces the complexity of maintenance, but also improves the efficiency of maintenance, and provides a strong guarantee for the long-term stable operation of the equipment. In addition, in the actual use of the device, its multiple L-shaped limit frames play an important role. These L-shaped limit frames The positioning frame can clamp the two sides of the fixing bolt. When the air-cooled evaporator and the air-cooled condenser are in operation, the equipment itself will generate vibrations of a certain frequency, and this vibration may cause the connection to loosen under long-term action. However, the existence of the L-shaped limit frame can effectively reduce the occurrence of this situation. They increase the stability of the connection by clamping the two sides of the fixing bolt, thereby reducing the problem of loose connection caused by vibration during the actual use of the air-cooled evaporator 1 and the air-cooled condenser 7. When it is necessary to disassemble the air-cooled evaporator 1 and the air-cooled condenser 7, there is another clever design to achieve it. After the connection block 711 rotates, the arc pressure blocks 715 on both sides of the connection block 711 are used to contact the pressure connecting rod 753. As the arc pressing block 715 acts on the pressing link 753, the pressing link 753 will drive the sliding blocks 751 of the multiple anti-loosening components to move. At this time, the multiple sliding blocks 751 will move in the designed direction and drive their respective L-shaped limit frames 755 to move, thereby releasing the clamping of the fixing bolt 713. In this way, the operator can easily disassemble the air-cooled evaporator 1 and the air-cooled condenser 7 as a whole. This design is convenient for personnel to perform maintenance, and can also better ensure the stability of the air-cooled evaporator 1 and the air-cooled condenser 7, effectively reducing the situation where the fixing bolt is offset and loosened due to vibration. Through such a structural design, the stability requirements of the equipment during normal operation are met, and the maintenance and disassembly of the equipment are convenient, thereby improving the overall performance and service life of the equipment.

[0152] In addition, the circuits, electronic components and modules involved in the present invention are all prior art and can be fully implemented by those skilled in the art. Needless to say, the content protected by the present invention does not involve improvements to the internal structure and methods.

[0153] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A data collection experimental device for a small low-temperature power generation module, characterized in that: It includes ORC power generation module, heat source simulation module, inverter grid-connected module, electronic load regulation module, battery charging module and detection control module; The ORC power generation module comprises a heat source simulation module, a throttle valve (S4) connected to the outlet of a compressor (4) in the heat source simulation module, an expander (6) connected to the throttle valve (S4), a generator (9) and a rotary valve (S5) connected to the expander (6), an air-cooled condenser (7) connected to the rotary valve (S5), and an inlet on the D1 side of a thermal economizer (3) in the heat source simulation module connected to the air-cooled condenser (7); a condensation pipe (720) is arranged inside the air-cooled condenser (7), and fixing plates (730) are arranged on both sides of the air-cooled condenser (7), and a plurality of fixing plates (730) are threadedly sleeved on the top. A fixing bolt (731) is provided, the top of the fixing bolt (731) is hexagonal, a limit assembly anti-loosening assembly is provided on the top of the air-cooled condenser (7), the limit assembly comprises a threaded rotating rod (710), the threaded rotating rod (710) is threadedly sleeved on the top of the air-cooled condenser (7), a connecting block (711) is fixedly sleeved on the outer wall of the threaded rotating rod (710), a cavity is provided inside the connecting block (711), arc pressure blocks (715) are provided on the outer walls of both sides of the connecting block (711), a plurality of springs (713) are provided on the top of the cavities, the ends of the plurality of springs (713) are connected to a limit plate (714), and the tops of the plurality of limit plates (714) are A pull rod (712) is provided at the top, and a clamping plate (740) and a clamping plate (745) are respectively clamped at both ends of the air-cooled condenser (7), and the side walls of the clamping plate (740) and the clamping plate (745) are respectively provided with support clamping seats (742), and a plurality of heat dissipation fins (743) are clamped between the support clamping seats (742), and a plurality of support clamping seats (742) are internally inserted with plug rods (744) for fixing the heat dissipation fins (743), and the tops of the clamping plate (740) and the clamping plate (745) are both provided with clamping limit grooves (741) matching the limit plate (715), and the side walls of the clamping plate (740) are provided with air-cooled condenser air. The machine (8) comprises a plurality of anti-loosening components including a mounting block (750), a plurality of side walls of the mounting blocks (750) are provided with guide grooves, a plurality of guide grooves are internally slidably connected with a sliding block (751), a rear outer wall of the sliding block (751) is provided with a return spring (752), the ends of the plurality of return springs (752) are connected to the inner wall of the guide groove, a pressing connecting rod (753) is provided on the outer wall of one side of the sliding block (751), a connecting block (754) is provided on the outer wall of the other side of the sliding block (751), L-shaped limiting frames (755) are provided on both sides of the connecting block (754), and the plurality of L-shaped limiting frames (755) are clamped on both sides of the fixing bolt (731); The heat source simulation module comprises a heat economizer (3), a sight glass (24) connected to the D2 side outlet of the heat economizer (3), an air-cooled evaporator (1) connected to the sight glass (24), a first solenoid valve (S1) and a second solenoid valve (S2) connected to the air-cooled evaporator (1), an F1 side inlet of the heat economizer (3) connected to the first solenoid valve (S1), a compressor (4) commonly connected to the F2 side outlet of the heat economizer (3) and the second solenoid valve (S2), and the air-cooled evaporator (1) contains an evaporator fan (2); The inverter grid-connected module comprises a first three-phase circuit breaker (K1) connected to the generator (9), a first relay (KM1) connected to the first three-phase circuit breaker (K1), a grid-connected inverter (10) connected to the first relay (KM1), and a mains supply connected to the grid-connected inverter (10); the circuit breaker (K1) and the first relay (KM1) control the on-off of the inverter grid-connected module circuit; The electronic load adjustment module comprises a second three-phase circuit breaker (K2) connected to the generator (9), a second relay (KM2) connected to the second three-phase circuit breaker (K2), a rectifier bridge (11) connected to the second relay (KM2), and an electronic load (12) connected to the rectifier bridge (11); The battery charging module comprises a third three-phase circuit breaker (K3) connected to the generator (9), a third relay (KM3) connected to the third three-phase circuit breaker (K3), a charging controller (13) connected to the third relay (KM3), and a battery (14) connected to the charging controller (13).

2. The data collection experimental device for a small-scale low-temperature power generation module according to claim 1 is characterized in that: The detection control module is mainly composed of a switch (23), MCGS (18), Huichuan controller H3s-2416MR / T-XP (17) and H3s-1616MR / T-XP (16), which communicate with each other through an Ethernet RJ45 interface; ports (1, 2, 5) of the switch (23) are respectively connected to the controller H3s-1616MR / T-XP (16), MCGS (18) and controller H3s-2416MR / T-XP (17); ports (2, 5) of the controller H3s-1616MR / T-XP (16) are respectively connected to the controller H3s-1616MR / T-XP (16); ports (1, 2, 5) of the controller H3s-1616MR / T-XP (16) are respectively connected to the controller H3s-1616MR / T-XP (16); ports (2, 5) of the controller H3s-2416MR / T-XP (17) are respectively connected to the controller H3s-1616MR / T-XP (16); ports (1, ... The analog input points (X00-X17) are respectively connected to the temperature sensor (T1-T12) and the pressure sensor (P1-P4); the controller H3s-1616MR / T-XP (16) is respectively connected to the expansion modules AM600-4AD (19) and AM600-4DA (20) through corresponding interfaces; the analog input points (CH0, CH3) of the AM600-AD (19) are respectively connected to the electronic load (12) and the frequency converter (5); the analog output points (CH0, CH3) of the AM600-DA (20) are respectively connected to the electronic load (12) and the frequency converter (5); The controller H3s-2416MR / T-XP (17) is connected to an electronic load (12) and a frequency converter (5); the analog input points (X00-X27) of the controller H3s-2416MR / T-XP (17) are respectively connected to a pressure sensor (P5-P11), an air temperature sensor (AT1-AT4), an air mass flow sensor (AM1, AM2), a mass flow sensor (M1-M3), a voltage sensor (U1, U2), a current sensor (I1, I2), an ambient temperature sensor (ET), an ambient humidity sensor (EH), a tachometer (R) and a battery tester (C); the controller The digital output points (Y00-Y12) of the device H3s-2416MR / T-XP (17) are connected to the relays (KM1-KM11) respectively, and the on and off of the corresponding circuit breakers and relays are controlled by a control program, the resistance of the electronic load (12) and the frequency of the inverter (5) are adjusted, and the opening of the throttle valve (S4) is manually adjusted, the experimental data are fitted, and different types of experimental working fluids are replaced, so as to realize the following different teaching modes and control methods: grid-connected teaching mode, load teaching mode, battery charging teaching mode, grid-connected power stable output teaching mode, and variable working fluid teaching mode.

3. A data collection and security protection method for a small-scale low-temperature power generation module according to any one of claims 1-2, characterized in that: (I) Teaching experiment under grid-connected mode:

1. Close the circuit breaker K0 to connect the entire experimental device to a 380V power supply; close the circuit breaker K1 and relay KM1 to close the circuit of the inverter grid-connected module; close the circuit breaker K4 and relay KM4 to connect the inverter (5) and compressor (4) to a 380V power supply; close the circuit breaker K5, relays KM8 and KM9 to connect the evaporator fan (2), air-cooled condenser fan (8), H3s-1616MR / T-XP (16), H3s-2416MR / T-XP (17) and switch (23) to a 220V power supply; close relays KM5 and KM6 to connect the inverter (5) and compressor (4) to a 380V power supply; close the circuit breaker K5, relays KM8 and KM9 to connect the evaporator fan (2), air-cooled condenser fan (8), H3s-1616MR / T-XP (16), H3s-2416MR / T-XP (17) and switch (23) to a 220V power supply. The first solenoid valve (S1) and the second solenoid valve (S2) are both closed; the rotary valve S5 is opened to allow the working fluid in the experimental device to flow, and the opening of the throttle valve S4 is manually adjusted to be fixed; when it is detected that the battery power C is greater than 20%, the circuit breaker K8 and the relay KM11 are closed, otherwise the circuit breaker K6 and the circuit breaker K7 are closed; the frequency of the inverter (5) is adjusted to change the heating capacity of the compressor (4) so ​​that the temperature of the simulated heat source is different under different experimental working conditions; the experimental device starts to operate; the difference between the outlet temperature (T12) on the D2 side of the thermal economizer (3) and the outlet temperature (T2) of the air-cooled evaporator (1) is detected like Then disconnect the relay KM6 and the second solenoid valve (S2); conversely, disconnect the relay KM5 and the first solenoid valve (S1); test the grid-connected power generation W1; after all data tests are completed, disconnect the circuit breaker (K0-K8) and the relay (KM1-KM11), close the rotary valve S5; stop the experimental device; detect the difference between the outlet temperature (T12) of the D2 side of the thermal economizer (3) and the outlet temperature (T2) of the air-cooled evaporator (1) like Then disconnect relay KM6 and the second solenoid valve (S2); conversely, disconnect relay KM5 and the first solenoid valve (S1); test the grid-connected power generation W1; after all data tests are completed, disconnect circuit breakers (K0-K8) and relays (KM1-KM11) and close rotary valve S5; stop the experimental device, and when the simulated heat source temperature provided by the heat source simulation module remains unchanged, study the influence of the throttle valve opening on the grid-connected power. Close circuit breaker K0 and connect the 380V power supply to the entire experimental device; close circuit breaker K1 and relay KM1 to close the circuit of the inverter grid-connected module; close circuit breaker K4 and relay KM4 to connect the frequency converter (5) and compressor (4) to the 380V power supply; close circuit breaker K5, relays KM8 and KM9 to connect the evaporator fan (2) and air-cooled condenser The blower (8), H3s-1616MR / T-XP (16), H3s-2416MR / T-XP (17) and the switch (23) are connected to a 220V power supply; the relays KM5 and KM6 are closed, so that the first solenoid valve (S1) and the second solenoid valve (S2) are both closed; the rotary valve S5 is opened, so that the working fluid in the experimental device can flow; the opening of the throttle valve (S4) is adjusted, so that the mass flow rate of the experimental working fluid is different under different experimental conditions; when the battery power C is detected to be greater than 20%, the circuit breaker K8 and the relay KM11 are closed, otherwise the circuit breaker K6 and the circuit breaker K7 are closed; the frequency converter (5) is set to a fixed value; the experimental device starts to operate; the difference between the outlet temperature (T12) on the D2 side of the thermal economizer (3) and the outlet temperature (T2) of the air-cooled evaporator (1) is detected like Then disconnect the relay KM6 and the second solenoid valve (S2), otherwise, disconnect the relay KM5 and the first solenoid valve (S1); test the grid-connected power generation W1; after all data tests are completed, disconnect the circuit breakers (K0-K8, 9 in total) and relays (KM1-KM11, 11 in total), close the rotary valve S5; the experimental device stops running; (II) Teaching experiment under load mode: When the simulated heat source temperature and working fluid mass flow provided by the heat source simulation module remain unchanged, study the influence of resistive load on the power generation of the experimental device; close the circuit breaker K0 to connect the entire experimental device to a 380V power supply; close the circuit breaker K2 and relay KM2 to close the circuit of the electronic load adjustment module; close the circuit breaker K4 and relay KM4 to connect the inverter (5) and the compressor (4) to a 380V power supply; close the circuit breaker K5, relays KM8, KM9 and KM10 to connect the evaporator fan (2), air-cooled condenser fan (8), electronic load (12), H3s-1616MR / T-XP (16), H3s-2416MR / T-XP (17) and switch (23 ) is connected to a 220V power supply; relays KM5 and KM6 are closed, so that the first solenoid valve (S1) and the second solenoid valve (S2) are both closed; the rotary valve S5 is opened so that the working fluid in the experimental device can flow; a fixed opening and frequency are set for the throttle valve (S4) and the frequency converter (5) respectively, so that the heat source temperature of the heat source simulation module and the mass flow rate of the experimental working fluid remain unchanged; when the battery power C is greater than 20%, the circuit breaker K8 and the relay KM11 are closed, otherwise the circuit breakers K6 and K7 are closed; the resistance value of the electronic load (12) is adjusted so that the load resistance value is different under different experimental conditions; the experimental device starts to operate; the difference between the outlet temperature (T12) on the D2 side of the thermal economizer (3) and the outlet temperature (T2) of the air-cooled evaporator (1) is detected like Then disconnect relay KM6 and the second solenoid valve (S2); conversely, disconnect relay KM5 and the first solenoid valve (S1); test the voltage (U1) across the electronic load and the current (I1) flowing through the electronic load; after all data tests are completed, disconnect the circuit breaker (K0-K8) and relay (KM1-KM11), close the rotary valve S5; and stop the experimental device. (III) Teaching experiment under battery charging mode: When the mass flow rate of the experimental working fluid remains unchanged, the influence of the simulated heat source temperature on the battery charging power is studied. The circuit breaker K0 is closed to connect the entire experimental device to a 380V power supply; the circuit breaker K3 and the relay KM3 are closed to close the circuit of the battery charging module; the circuit breaker K4 and the relay KM4 are closed to connect the inverter (5) and the compressor (4) to a 380V power supply; the circuit breaker K5, the relays KM8 and KM9 are closed to connect the evaporator fan (2), the air-cooled condenser fan (8), and the H3s -1616MR / T-XP (16), H3s-2416MR / T-XP (17) and switch (23) are connected to a 220V power supply; relays KM5 and KM6 are closed, so that the first solenoid valve (S1) and the second solenoid valve (S2) are both closed, and the rotary valve S5 is opened so that the working medium in the experimental device can flow; the opening of the throttle valve (S4) is fixed; the frequency of the inverter (5) is adjusted to change the heating capacity of the compressor (4), so that the temperature of the simulated heat source is different under different experimental working conditions; The experimental device starts to operate; the difference between the outlet temperature (T12) of the D2 side of the thermal economizer (3) and the outlet temperature (T2) of the air-cooled evaporator (1) is detected. like If the temperature of the heat source provided by the heat source simulation module remains unchanged, the influence of the throttle valve opening on the battery charging power is studied. Close the circuit breaker K0 and connect the 380V power supply to the entire experimental device. Close the circuit breaker K3 and relay KM3 to close the circuit of the battery charging module. Close the circuit breaker K4 and relay KM4 to connect the inverter (5) and the compressor (4) to the 380V power supply. Close the circuit breaker K5 and relay KM6 to connect the 380V power supply to the battery charging module. The circuit breaker K5, relays KM8 and KM9 are used to connect the evaporator fan (2), the air-cooled condenser fan (8), H3s-1616MR / T-XP (16), H3s-2416MR / T-XP (17) and the switch (23) to a 220V power supply; the relays KM5 and KM6 are closed so that the first solenoid valve (S1) and the second solenoid valve (S2) are closed; the rotary valve S5 is opened so that the working fluid in the experimental device can flow; the opening of the throttle valve (S4) is adjusted so that the mass flow rate of the working fluid is different under different experimental conditions; the frequency of the inverter (5) is adjusted to a suitable fixed value; the experimental device starts to operate; and the difference between the outlet temperature (T12) on the D2 side of the thermal economizer (3) and the outlet temperature (T2) of the air-cooled evaporator (1) is detected. like Then disconnect the relay KM6 and the second electromagnetic valve (S2), otherwise, disconnect the relay KM5 and the first electromagnetic valve (S1); test the charging voltage U2 and charging current I2 of the storage battery (14); after all data tests are completed, disconnect the circuit breaker (K0-K8) and the relay (KM1-KM11), close the rotary valve S5; and stop the experimental device; (IV) Teaching experiment of automatic regulation of stable power output: Given the power demand needPower and the set regulation accuracy value acc; Close the circuit breaker K0 to connect the entire experimental device to a 380V power supply; Close the circuit breaker K1 and the relay KM1 to close the circuit of the inverter grid-connected module; Close the circuit breaker K4 and the relay KM4 to connect the frequency converter (5) and the compressor (4) to a 380V power supply; Close the circuit breaker K5, the relays KM8 and KM9 to connect the evaporator fan (2), the air-cooled condenser fan (8), the H3s-1616MR / T-XP (16), the H3s-2416MR / T-XP (17) and the switch (23) to a 220V power supply; Close relays KM5 and KM6 so that the first solenoid valve (S1) and the second solenoid valve (S2) are both closed; open the rotary valve S5 so that the working fluid in the experimental device can flow; obtain and set the opening of the throttle valve S4 to a fixed value opg when the grid-connected power generation is maximum through experiments; when the battery power C is detected to be greater than 20%, close the circuit breaker K8 and relay KM11, otherwise close the circuit breaker K6 and circuit breaker K7; adjust the frequency of the inverter (5) to change the heating capacity of the compressor (4) so ​​that the temperature of the simulated heat source is different under different experimental conditions; start the operation of the experimental device; detect the difference between the outlet temperature (T12) on the D2 side of the thermal economizer (3) and the outlet temperature (T2) of the air-cooled evaporator (1) like Then disconnect the relay KM6 and the second electromagnetic valve (S2); conversely, disconnect the relay KM5 and the first electromagnetic valve (S1); adjust the frequency of the inverter (5) and test the maximum value W1_max and the minimum value W1_min of the grid-connected power W1; judge whether W1_min≤needPower≤W1_max, if not, prompt: exceed the demand; if so, assign a value Interpretation If not, the frequency of the frequency converter (5) is reduced by i (i is obtained by fitting the experimental data); if yes, the experiment is completed; the circuit breaker (K0-K8) and the relay (KM1-KM11) are disconnected, and the rotary valve S5 is closed; the experimental device stops running; (V) Teaching experiment on power generation efficiency under different experimental working fluids: When a new working fluid is replaced in the experiment, the power generation efficiency of the device under different working fluids is studied; open the rotary valve S3 to extract the old working fluid in the device; add new working fluid to the device and close the rotary valve S3; close the circuit breaker K0 to connect the entire experimental device to a 380V power supply; close the circuit breaker K1 and the relay KM1 to close the circuit of the inverter grid-connected module; close the circuit breaker K4 and the relay KM4 to connect the inverter (5) and the compressor (4) to a 380V power supply; close the circuit breaker K5, the relays KM8 and KM9 to connect the evaporator fan (2), the air-cooled condenser fan (8), and the H3s-1616MR / T-XP (16), H3s-2416MR / T-XP (17) and switch (23) are connected to a 220V power supply; relays KM5 and KM6 are closed, so that the first solenoid valve (S1) and the second solenoid valve (S2) are both closed; the rotary valve S5 is opened to allow the working fluid in the experimental device to flow; the opening of the throttle valve S4 and the frequency of the inverter (5) under different working conditions are set; if the battery power C is greater than 20%, the circuit breaker K8 and relay KM11 are closed, otherwise the circuit breaker K6 and circuit breaker K7 are closed; the experimental device starts to operate; the difference between the outlet temperature (T12) on the D2 side of the thermal economizer (3) and the outlet temperature (T2) of the air-cooled evaporator (1) is detected like Then disconnect the relay KM6 and the second solenoid valve (S2), otherwise, disconnect the relay KM5 and the first solenoid valve (S1); calculate the power generation efficiency η under this working condition based on the experimental data of the test; after all data tests are completed, disconnect the circuit breakers (K0-K8, 9 in total) and relays (KM1-KM11, 11 in total), close the rotary valve S5, and stop the experimental device.

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