Energy efficiency evaluation method and monitoring system for multi-temperature zone cold storage refrigerated truck

Abstract

The present invention discloses an energy efficiency evaluation method and monitoring system for a multi-temperature zone cold storage refrigerated truck, which relates to the field of refrigerated trucks and energy efficiency testing technology. Through a variety of sensing devices, the cold charging unit, refrigerated truck and cold storage plate are monitored in real time; various energy efficiency data are collected, and the cold storage capacity of the cold storage plate, the heat dissipation of the box, the heat leakage of the box, the solar radiation, the effective energy of cold charging, the effective energy of transportation, etc. are calculated; based on the first and second laws of thermodynamics, energy efficiency indicators are calculated, including the cold storage efficiency and the cold charging performance coefficient during the cold charging process, as well as the transportation efficiency and the cold release performance coefficient during the transportation process; according to various energy efficiency indicators, a comprehensive energy efficiency evaluation index is calculated for energy efficiency evaluation. The present invention is compatible with multi-temperature zone cold storage refrigerated trucks of different models and brands, and its energy efficiency level is evaluated scientifically, comprehensively and systematically, which is helpful to quickly take improvement measures for weak links in energy efficiency, improve equipment energy efficiency, and achieve the goal of energy conservation and emission reduction.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerated trucks and energy efficiency testing, and in particular to an energy efficiency evaluation method and a monitoring system for a multi-temperature zone cold storage refrigerated truck. Background Art

[0002] Traditional refrigerated transport vehicles usually only provide a single temperature range, while different types of goods have different temperature requirements, such as fresh fruits, frozen meats and pharmaceutical products. Therefore, the development of transport vehicles that can provide multi-temperature zone refrigeration functions is of great significance to ensure the quality of goods, reduce energy consumption and improve transportation efficiency.

[0003] Compared with the continuous operation mode of mechanical refrigeration systems, cold storage technology uses cold charging during off-peak hours and releasing cold during transportation. On the one hand, this method can reduce the load demand on the power grid during peak hours and reduce fuel consumption and carbon emissions. On the other hand, the cold storage board provides a more stable release of cold, which can better maintain the temperature stability of the goods and reduce the impact of temperature fluctuations on the quality of the goods.

[0004] At present, the application of multi-temperature zone cold storage refrigerated trucks is becoming more and more widespread in the market, but there is a relative lack of evaluation methods for their energy efficiency. This situation has brought many inconveniences and energy waste: First, the lack of a unified energy efficiency evaluation standard makes it difficult to scientifically evaluate the energy efficiency level of multi-temperature zone cold storage refrigerated trucks of different models and brands, which makes it difficult for users to make the best decision when selecting equipment; second, due to the lack of a unified energy efficiency evaluation method, it is difficult to identify and improve the weak links in the energy efficiency of the equipment, resulting in low energy utilization efficiency and increased operating costs; finally, due to the inability to accurately evaluate and optimize energy efficiency, multi-temperature zone cold storage refrigerated trucks may waste energy in actual operation, increasing the total energy consumption of cold chain transportation, which is not conducive to the realization of energy conservation and emission reduction goals. Summary of the invention

[0005] In order to overcome the defects in the above-mentioned prior art, the present invention provides an energy efficiency evaluation method for a multi-temperature zone cold storage refrigerated truck, which can scientifically, comprehensively and systematically evaluate the energy efficiency level of the refrigerated truck, help to quickly take improvement measures for weak links in energy efficiency, improve equipment energy efficiency, and achieve the goal of energy conservation and emission reduction.

[0006] To achieve the above object, the present invention adopts the following technical solutions, including:

[0007] An energy efficiency evaluation method for multi-temperature zone cold storage refrigerated vehicles.

[0008] Calculate energy efficiency indicators, including the cold storage efficiency and cold charging performance coefficient during the cold charging process, and the transportation efficiency and cold release performance coefficient during the transportation process; the cold storage efficiency and transportation efficiency are calculated based on the first law of thermodynamics, and are used to evaluate the energy storage level of the refrigerated truck during the cold charging process and the energy release level of the refrigerated truck during the transportation process; the cold charging performance coefficient and cold release performance coefficient are calculated based on the second law of thermodynamics, and are used to evaluate the effective energy utilization level during the cold charging process and the transportation process;

[0009] A comprehensive energy efficiency rating index is calculated based on the values ​​of various energy efficiency indicators; the comprehensive energy efficiency rating index is used for energy efficiency evaluation.

[0010] Preferably, the cold storage efficiency η ch The calculation formula to characterize the cold amount charged into unit mass phase change material per unit time during the cold charging process is:

[0011] ;

[0012] Among them, m pcm is the total mass of the phase change material, which is the sum of the mass of the phase change material in each temperature zone; Q pcm,c is the total cooling capacity obtained by the refrigerated truck, which is the sum of the cooling capacity of the cold storage plates in each temperature zone; t charge It is the duration of cold charging;

[0013] ;

[0014] Among them, m pcm,i is the mass of phase change material in the i-th temperature zone; c p,li is the liquid phase heat of the phase change material in the i-th temperature zone; c p,si is the solid-state relative heat of the phase change material in the i-th temperature zone; T f,i is the phase change point temperature of the phase change material in the i-th temperature zone; L i is the latent heat of the phase change material in the i-th temperature zone; T sc,i is the phase change material temperature of the ith temperature zone at the beginning of cold charging; T ec,i is the temperature of the phase change material in the i-th temperature zone at the end of cold charging.

[0015] Preferably, the cold charging performance coefficient η ex,c Reflects the effective energy utilization rate in the cold charging process, and the calculation formula is:

[0016] ;

[0017] Among them, Q useful,c is the effective energy of the cooling process; W charge is the total power consumption of the cooling process;

[0018] ;

[0019] Among them, Q ref Q is the total cooling capacity of the refrigerant charged into the refrigerated truck; lossc,i Q is the amount of heat dissipated from the i-th temperature zone to the external environment during the cold charging process; leakc,i Q is the heat leakage from the i-th temperature zone to the external environment during the cold charging process; solarc,i is the amount of solar radiation received by the i-th temperature zone during the cooling process;

[0020] ;

[0021] ;

[0022] ;

[0023] ;

[0024] Among them, c p,ref is the specific heat capacity of the refrigerant; M ref is the refrigerant mass flow rate; T ex,ref is the refrigerant outlet temperature of the refrigerated truck; T en,ref is the refrigerant inlet temperature of the refrigerated truck; t charge K is the cold charging time; i A is the comprehensive heat transfer coefficient of the box in the i-th temperature zone; b,i is the heat transfer area of ​​the box in the i-th temperature zone; T 0,c T is the external environment temperature during the cold charging process; bc,i is the temperature inside the box in the i-th temperature zone during the cold charging process; q leakc,i A is the heat leakage heat flux density of the i-th temperature zone during the cold charging process; d,i is the heat transfer area of ​​the box door gap in the i-th temperature zone; α i A is the radiation absorption rate of the box material in the i-th temperature zone; r,i is the solar radiation area of ​​the box in the i-th temperature zone; q solarc,i is the solar radiation intensity of the i-th temperature zone during the cooling process.

[0025] Preferably, the transport efficiency η tr It represents the amount of cold consumed by transporting a unit mass of goods per unit time during transportation. The calculation formula is:

[0026] ;

[0027] Among them, m cargo is the total mass of the transported goods, which is the sum of the masses of the goods in each temperature zone; Q pcm,t is the total cooling consumption during the transportation process, and is the sum of the cooling consumption of the cold storage plates in each temperature zone; t transport The duration of transportation;

[0028] ;

[0029] Among them, m pcm,i is the mass of phase change material in the i-th temperature zone; c p,li is the liquid phase heat of the phase change material in the i-th temperature zone; c p,si is the solid-state relative heat of the phase change material in the i-th temperature zone; T f,i is the phase change point temperature of the phase change material in the i-th temperature zone; L i is the latent heat of the phase change material in the i-th temperature zone; T et,i is the phase change material temperature in the i-th temperature zone at the end of transportation; T st,i is the temperature of the phase change material in the i-th temperature zone at the beginning of transportation.

[0030] Preferably, the cooling performance coefficient η ex,t Reflects the effective energy utilization rate during transportation. The calculation formula is:

[0031] ;

[0032] Among them, Q useful,t is the effective energy of the transport process; Q pcm,t is the total cooling consumption during the transportation process, which is the sum of the cooling consumption of the cold storage plates in each temperature zone;

[0033] ;

[0034] Among them, m pcm,i is the mass of phase change material in the i-th temperature zone; c p,li is the liquid phase heat of the phase change material in the i-th temperature zone; c p,si is the solid-state relative heat of the phase change material in the i-th temperature zone; T f,i is the phase change point temperature of the phase change material in the i-th temperature zone; L i is the latent heat of the phase change material in the i-th temperature zone; T et,i is the phase change material temperature in the i-th temperature zone at the end of transportation; T st,i is the temperature of the phase change material in the i-th temperature zone at the beginning of transportation;

[0035] ;

[0036] Among them, Q pcm,t is the total refrigeration consumption during the transportation process; Q losst,i Q is the amount of heat dissipated from the i-th temperature zone to the external environment during transportation; leakt,i Q is the heat leakage from the i-th temperature zone to the external environment during transportation, solart,i is the amount of solar radiation received by the i-th temperature zone during transportation;

[0037] ;

[0038] ;

[0039] ;

[0040] Among them, K i A is the comprehensive heat transfer coefficient of the box in the i-th temperature zone; b,i is the heat transfer area of ​​the box in the i-th temperature zone; T 0,t is the external environment temperature during transportation; T bt,i is the temperature inside the box in the i-th temperature zone during transportation; t transport is the transportation time; q leakt,i is the heat leakage heat flux density of the i-th temperature zone during transportation; A d,i is the heat transfer area of ​​the box door gap in the i-th temperature zone; α i A is the radiation absorption rate of the box material in the i-th temperature zone; r,i is the solar radiation area of ​​the box in the i-th temperature zone; q solart,i is the solar radiation intensity in the i-th temperature zone during transportation.

[0041] Preferably, the comprehensive energy efficiency evaluation index η total for:

[0042] ;

[0043] Among them, η ch , η tr , η ex,c , η ex,t They represent the cold storage efficiency, transportation efficiency, cold charging performance coefficient and cold releasing performance coefficient respectively; ω1, ω2 and ω3 are all weight coefficients; comprehensive energy efficiency evaluation index η total The larger the value, the better the energy efficiency evaluation of the refrigerated truck.

[0044] The present invention also provides an energy efficiency evaluation and monitoring system for a multi-temperature zone cold storage refrigerated vehicle, which is applicable to the energy efficiency evaluation method for a multi-temperature zone cold storage refrigerated vehicle mentioned above, and the system comprises: a refrigerated vehicle and a cold charging unit;

[0045] The refrigerated truck is divided into a plurality of temperature zones, each of which is provided with a cold storage plate; the cold storage plate is provided with a phase change material;

[0046] The refrigerated truck includes two processes: refrigeration and transportation;

[0047] During the cold charging process, the cold charging unit is powered on, and the cold capacity of the cold charging unit is transferred to the phase change material in the cold storage plate of each temperature zone on the refrigerated truck through the refrigerant; the refrigerant in the cold charging unit flows into the cold storage plate of each temperature zone through the refrigerant inlet pipeline, and after heat exchange with the phase change material in the cold storage plate of each temperature zone, it flows out of the cold storage plate of each temperature zone from the refrigerant outlet pipeline and flows back to the cold charging unit;

[0048] During transportation, the refrigerated truck is independent of the cold charging unit, and each temperature zone releases cold through the cold storage plate to maintain the temperature of each temperature zone.

[0049] Preferably, different sensing devices are installed on the cold charging unit, the refrigerated truck and the cold storage plate respectively;

[0050] The cold charging unit monitors the cold charging time t through the cold charging unit data recorder charge ; Install an energy sensor at the power input end of the cold charging unit to monitor the total power consumption W of the cold charging process charge ; Install a refrigerant inlet temperature sensor and a flow sensor on the refrigerant inlet pipeline to monitor the refrigerant inlet temperature T en , ref and refrigerant mass flow rate M ref ; Install a refrigerant outlet temperature sensor on the refrigerant outlet pipeline to monitor the refrigerant outlet temperature T ex , ref ;

[0051] The refrigerated truck monitors the transport time t through the on-board data recorder transport ; Install a box temperature sensor in each temperature zone to monitor the box temperature in each temperature zone; install an ambient temperature sensor on the outside of the box to monitor the external ambient temperature; install a box door heat flux sensor at the box door gap in each temperature zone to monitor the heat leakage heat flux density in each temperature zone; install a solar radiation sensor at the sun's direct exposure position outside the box in each temperature zone to monitor the solar radiation intensity in each temperature zone; install a box mass sensor at the bottom of the box in each temperature zone to monitor the quality of the goods in each temperature zone;

[0052] The cold storage plate has a cold storage plate temperature sensor installed inside the cold storage plate to monitor the temperature change of the phase change material in the cold storage plate; and a cold storage plate quality sensor is installed at the bottom of the cold storage plate to monitor the quality of the phase change material in the cold storage plate.

[0053] Preferably, a data collector and a central control system are provided on the refrigerated truck; the data collector collects monitoring values ​​of all sensor equipment on the cold charging unit, the refrigerated truck and the cold storage plate, and transmits them to the central control system wirelessly; the central control system analyzes the data in real time, calculates various energy efficiency indicators and comprehensive energy efficiency evaluation index, and performs energy efficiency evaluation.

[0054] The present invention also provides a computer program product, characterized in that it includes a computer program / instruction, which, when executed by a processor, implements the above-mentioned energy efficiency evaluation method for a multi-temperature zone cold storage refrigerated vehicle.

[0055] The advantages of the present invention are:

[0056] (1) Based on the first and second laws of thermodynamics, the present invention provides a scientific, comprehensive and systematic energy efficiency evaluation method, which can accurately evaluate the cold storage efficiency, cold charging performance coefficient, transportation efficiency and cold release performance coefficient, and calculate the comprehensive energy efficiency evaluation index for energy efficiency evaluation.

[0057] (2) The method of the present invention helps to quickly take improvement measures for weak links in energy efficiency, improve equipment energy efficiency, and achieve the goal of energy conservation and emission reduction.

[0058] (3) The method of the present invention can be adapted to multi-temperature zone cold storage refrigerated trucks of different sizes and brands, and is not restricted by specific models and brands. In view of the characteristics of multi-temperature zone refrigerated trucks, the energy efficiency of multiple temperature zones can be monitored and evaluated simultaneously to meet the transportation requirements of goods with multiple temperature requirements.

[0059] (4) The present invention uses a variety of sensors and an on-board data acquisition system to monitor the cold charging unit, the multi-temperature zone refrigerated vehicle body and the on-board cold storage plate in real time to obtain comprehensive energy efficiency data.

[0060] (5) The present invention uses a central control system to analyze data in real time, calculate various energy efficiency indicators and conduct comprehensive evaluations to ensure the accuracy and timeliness of the evaluation results. Based on real-time data and analysis results, the energy efficiency management strategy during the cold charging and transportation process can be adjusted and optimized in a timely manner.

[0061] (6) The present invention helps users better understand the operating status and energy efficiency of refrigerated trucks through real-time monitoring and data analysis, and realizes intelligent management. It provides intuitive energy efficiency evaluation results and weak link identification, allowing users to quickly take improvement measures to improve the performance and reliability of the overall system.

[0062] (7) The present invention helps achieve the goals of green cold chain and low-carbon cold chain by optimizing the energy efficiency during cold charging and transportation, reducing energy consumption and carbon emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 Schematic diagram of the sensor equipment setup for a multi-temperature zone cold storage refrigerated truck.

[0064] Description of reference numerals:

[0065] 1—refrigerated truck; 2—insulation partition; 3—truck door; 4—cold storage plate; 5—power supply; 6—cold charging unit; 7—refrigerant inlet pipeline; 8—refrigerant outlet pipeline; 9—cold storage plate mass sensor; 10—cold storage plate temperature sensor; 11—box temperature sensor; 12—box door heat flow sensor; 13—box mass sensor; 14—solar radiation sensor; 15—data collector; 16—central control system; 17—ambient temperature sensor; 18—refrigerant inlet temperature sensor; 19—refrigerant mass flowmeter; 20—refrigerant outlet temperature sensor; 21—electric energy sensor; 22—cold charging unit data recorder; 23—vehicle-mounted data recorder. DETAILED DESCRIPTION

[0066] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0067] Example 1

[0068] Depend on Figure 1 As shown, an energy efficiency evaluation and monitoring system for a multi-temperature zone cold storage refrigerated truck includes: a refrigerated truck 1 and a cold charging unit 6. The refrigerated truck 1 is divided into multiple temperature zones by an insulating partition 2, and each temperature zone is provided with a cold storage plate 4. The cold storage plate 4 is provided with a phase change material for releasing cold to maintain the temperature of each temperature zone.

[0069] The refrigerated truck 1 includes two processes: refrigeration and transportation.

[0070] During the cold charging process, the cold charging unit 6 is connected to the power supply 5, and the cold energy of the cold charging unit is transferred to the phase change material in the cold storage plate 4 of each temperature zone on the refrigerated vehicle 1 through the refrigerant; the refrigerant in the cold charging unit 6 flows into the cold storage plate 4 of each temperature zone through the refrigerant inlet pipeline 7, and after heat exchange with the phase change material in the cold storage plate 4 of each temperature zone, it flows out of the cold storage plate 4 of each temperature zone from the refrigerant outlet pipeline 8 and flows back to the cold charging unit 6. The cold energy consumption during the cold charging process includes: the cold energy charged into the cold storage plate, the cold energy of the refrigerated vehicle box and the air inside the box, the heat dissipation of the box to the outside, the heat leakage of the box and the solar radiation.

[0071] During transportation, the refrigerated truck 1 is independent of the cold charging unit 6, and each temperature zone releases cold to maintain the temperature of each temperature zone through the cold storage plate 4. The cold energy consumption during transportation includes: the cold energy for cooling and maintaining the temperature of the goods, the heat dissipated by the box, the heat leakage of the box, and the solar radiation.

[0072] The monitoring scope of the cold charging process includes the cold charging unit 6, the multi-temperature zone cold storage refrigeration vehicle 1 and the cold storage plate 4. During the cold charging process, the monitoring parameters of the cold charging unit 6 include the total power consumption W of the cold charging process. charge 、Cold charging time t charge , Refrigerant inlet temperature T en , ref , refrigerant outlet temperature T ex , ref , refrigerant mass flow rate M ref ; The monitoring parameters of the multi-temperature zone cold storage refrigerated vehicle 1 include the external environment temperature T during the cold charging process 0,c , Temperature T in each temperature zone during the charging and cooling process bc,i , heat leakage heat flux density q in each temperature zone during the cooling process leakc,i , Solar radiation intensity q during the cooling process solarc,i ; Monitoring parameters of cold storage plate 4 include the mass m of phase change material in each temperature zone pcm,i , Temperature of phase change material in each temperature zone at the beginning of cold charging T sc,i , the temperature of phase change material in each temperature zone after cold charging T ec,i .

[0073] The monitoring scope of the transportation process includes the multi-temperature zone cold storage refrigerated truck 1 and the cold storage plate 4. During the transportation process, the monitoring parameters of the multi-temperature zone cold storage refrigerated truck 1 include the transportation time t transport , Cargo mass in each temperature zone m cargo,i , External environment temperature during transportation T 0,t , Temperature in each temperature zone during transportation T bt,i , heat leakage heat flux density q in each temperature zone during transportation leakt,i , Solar radiation intensity during transportation q solart,i ; The monitoring parameters of the cold storage plate 4 include the mass m of the phase change material in each temperature zone pcm,i , Phase change material temperature T in each temperature zone at the beginning of transportation st,i , the temperature of phase change material in each temperature zone after the cold charging is completed T et,i .

[0074] Different sensing devices are installed on the cold charging unit 6, the multi-temperature zone cold storage refrigerated vehicle 1 and the cold storage plate 4 respectively. Figure 1 This is a schematic diagram of the arrangement of the sensor equipment for a multi-temperature zone cold storage refrigerated vehicle according to an embodiment of the present invention.

[0075] On the cold charging unit 6, the cold charging time t is monitored by the cold charging unit data recorder 22 charge Install an energy sensor 21 at the power input terminal of the cold charging unit to monitor the total power consumption W of the cold charging process charge ; Install the refrigerant inlet temperature sensor 18 and the flow sensor 19 on the refrigerant inlet pipe 7 to monitor the refrigerant inlet temperature T en , refand refrigerant mass flow rate M ref ; Install a refrigerant outlet temperature sensor 20 on the refrigerant outlet pipe 8 to monitor the refrigerant outlet temperature T ex , ref .

[0076] In the refrigerated truck 1, the transport time t is monitored by the on-board data recorder 23 transport Install the temperature sensor 11 in each temperature zone to monitor the temperature T in each temperature zone during the cold charging process. bc,i And the temperature T in each temperature zone during transportation bt,i Install an ambient temperature sensor 17 outside the car to monitor the external ambient temperature T during the charging and cooling process 0,c and the ambient temperature T during transportation 0,t Install the door heat flux sensor 12 at the gap of each temperature zone car door 3 to monitor the heat leakage heat flux density q of each temperature zone during the cold charging process leakc,i and the heat leakage heat flux density q in each temperature zone during transportation leakt,i Install solar radiation sensors 14 in the direct sunlight position outside the box of each temperature zone to monitor the solar radiation intensity q in each temperature zone during the cold charging process solarc,i And the solar radiation intensity q in each temperature zone during transportation solart,i A box quality sensor 13 is installed at the bottom of each temperature zone box to monitor the quality of goods in each temperature zone.

[0077] On the cold storage plate 4, a cold storage plate temperature sensor 10 is installed inside the cold storage plate 4 to monitor the temperature change of the phase change material in the cold storage plate 4; a cold storage plate quality sensor 9 is installed at the bottom of the cold storage plate 4 to monitor the quality of the phase change material in the cold storage plate 4.

[0078] The refrigerated truck 1 is provided with a data collector 15 and a central control system 16. The data collector 15 collects the monitoring values ​​of all the sensor devices on the cold charging unit 6, the multi-temperature zone cold storage refrigerated truck 1 and the cold storage plate 4, and transmits them to the central control system 16 by wireless means. The central control system 16 performs real-time analysis on the data, calculates various energy efficiency indicators and comprehensive energy efficiency evaluation indexes in combination with the physical properties of the refrigerant, the physical properties of the phase change material, the box structure parameters and the thermal parameters, and performs energy efficiency evaluation.

[0079] Example 2

[0080] An energy efficiency evaluation method for a multi-temperature zone cold storage refrigerated truck obtains a comprehensive energy efficiency evaluation index through four energy efficiency indicators for energy efficiency evaluation.

[0081] Energy efficiency indicators include cold storage efficiency, cold charging performance coefficient, transportation efficiency and cold release performance coefficient. Specifically, the cold storage efficiency and transportation efficiency are based on the first law of thermodynamics, and evaluate the energy storage and energy release levels of refrigerated trucks during the cold charging process and transportation process respectively; while the cold charging performance coefficient and cold release performance coefficient are based on the second law of thermodynamics, and evaluate the effective energy utilization level during the cold charging process and transportation process respectively.

[0082] Cold storage efficiency η ch Characterizes the amount of cold charged into the unit mass of phase change material per unit time during the cold charging process. The larger the value, the better the vehicle's cold storage efficiency. The calculation formula is:

[0083] ;

[0084] Among them, m pcm is the total mass of the phase change material, which is the sum of the mass of the phase change material in each temperature zone; Q pcm,c is the total cooling capacity obtained by the refrigerated truck, which is the sum of the cooling capacity of the cold storage plates in each temperature zone; t charge It is the duration of cold charging.

[0085] The total cooling capacity of the refrigerated truck is:

[0086] ;

[0087] Among them, c p,li is the liquid phase heat of the phase change material in the i-th temperature zone; c p,si is the solid-state relative heat of the phase change material in the i-th temperature zone; T f,i is the phase change point temperature of the phase change material in the i-th temperature zone; L i is the latent heat of the phase change material in the i-th temperature zone; m pcm,i is the mass of phase change material in the i-th temperature zone; T sc,i is the phase change material temperature of the ith temperature zone at the beginning of cold charging; T ec,i is the temperature of the phase change material in the i-th temperature zone at the end of cold charging.

[0088] Cooling performance coefficient η ex,c Reflects the effective energy utilization rate of the cooling process. The larger the value, the better the cooling performance of the vehicle. The calculation formula is:

[0089] ;

[0090] Among them, Q useful,c The effective energy of the cold charging process includes the cold amount charged into the cold storage plate and the cold amount reduced in the box and the air inside the box; W charge It is the total power consumption of the cooling process.

[0091] The effective energy of the cold charging process is:

[0092] ;

[0093] Among them, Q ref Q is the total cooling capacity of the refrigerant charged into the refrigerated truck; lossc,i Q is the amount of heat dissipated from the i-th temperature zone to the external environment during the cold charging process; leakc,i Q is the heat leakage from the i-th temperature zone to the external environment during the cold charging process; solarc,i is the solar radiation received by the i-th temperature zone during the cooling process, and its values ​​are:

[0094] ;

[0095] ;

[0096] ;

[0097] ;

[0098] Among them, c p,ref is the specific heat capacity of the refrigerant; M ref is the refrigerant mass flow rate; T ex,ref is the refrigerant outlet temperature of the refrigerated truck; T en,ref is the refrigerant inlet temperature of the refrigerated truck; t charge K is the cold charging time; i A is the comprehensive heat transfer coefficient of the box in the i-th temperature zone; b,i is the heat transfer area of ​​the box in the i-th temperature zone; T 0,c T is the external environment temperature during the cold charging process; bc,i is the temperature inside the box in the i-th temperature zone during the cold charging process; q leakc,i A is the heat leakage heat flux density of the i-th temperature zone during the cold charging process; d,i is the heat transfer area of ​​the box door gap in the i-th temperature zone; α i A is the radiation absorption rate of the box material in the i-th temperature zone; r,i is the solar radiation area of ​​the box in the i-th temperature zone; q solarc,i is the solar radiation intensity of the i-th temperature zone during the cooling process.

[0099] Transport efficiency η tr It represents the amount of cold consumed by transporting a unit mass of goods per unit time during the transportation process. The smaller the value, the better the vehicle transportation efficiency. The calculation formula is:

[0100] ;

[0101] Among them, m cargo is the total mass of the transported goods, which is the sum of the masses of the goods in each temperature zone; Q pcm,t is the total cooling consumption during the transportation process, and is the sum of the cooling consumption of the cold storage plates in each temperature zone; t transport The length of time for transportation.

[0102] The refrigeration consumption during transportation is:

[0103] ;

[0104] Among them, c p,li is the liquid phase heat of the phase change material in the i-th temperature zone; c p,si is the solid-state relative heat of the phase change material in the i-th temperature zone; T f,i is the phase change point temperature of the phase change material in the i-th temperature zone; L i is the latent heat of the phase change material in the i-th temperature zone; m pcm,i is the mass of phase change material in the i-th temperature zone; T et,i is the phase change material temperature in the i-th temperature zone at the end of transportation; T st,i is the temperature of the phase change material in the i-th temperature zone at the beginning of transportation.

[0105] Cooling performance coefficient η ex,t Reflects the ratio of effective utilization of cooling capacity during transportation. The larger the value, the better the cooling performance of the vehicle. The calculation formula is:

[0106] ;

[0107] Among them, Q useful,t It is the effective energy of the transportation process, which is the cooling capacity consumed to maintain the temperature of the box and the goods in each temperature zone; Q pcm,t It is the total cooling consumption in the transportation process and the sum of cooling consumption of cold storage plates in each temperature zone.

[0108] The effective energy of the transport process is:

[0109] ;

[0110] Among them, Q pcm,t is the cooling energy consumption during transportation; Q losst,i Q is the amount of heat dissipated from the i-th temperature zone to the external environment during transportation; leakt,i Q is the heat leakage from the i-th temperature zone to the external environment during transportation, solart,i is the solar radiation received by the i-th temperature zone during transportation, and its values ​​are:

[0111] ;

[0112] ;

[0113] ;

[0114] Among them, K i A is the comprehensive heat transfer coefficient of the box in the i-th temperature zone; b,i is the heat transfer area of ​​the box in the i-th temperature zone; T 0,tis the external environment temperature during transportation; T bt,i is the temperature inside the box in the i-th temperature zone during transportation; t transport is the transportation time; q leakt,i is the heat leakage heat flux density of the i-th temperature zone during transportation; A d,i is the heat transfer area of ​​the box door gap in the i-th temperature zone; α i A is the radiation absorption rate of the box material in the i-th temperature zone; r,i is the solar radiation area of ​​the box in the i-th temperature zone; q solart,i is the solar radiation intensity in the i-th temperature zone during transportation.

[0115] The above energy efficiency indicators are weighted and combined to obtain a comprehensive energy efficiency evaluation index η total , the larger the value, the better the comprehensive energy efficiency level of the vehicle. The calculation formula is:

[0116] ;

[0117] Among them, η ch , η tr , η ex,c , η ex,t They respectively represent the cold storage efficiency, transportation efficiency, cold charging performance coefficient and cold releasing performance coefficient; ω1, ω2, ω3 are weight coefficients, which are adjusted according to the specific application scenario.

[0118] Comprehensive energy efficiency evaluation index η total The larger the value, the better the energy efficiency evaluation of the refrigerated truck.

[0119] In order to ensure the uniformity of energy efficiency assessment methods and reduce errors, the following conditions must be met when conducting energy efficiency evaluation: the external ambient temperature on the day of assessment is not less than 30°C, the sunshine duration is not less than 10 hours, and the vehicle load is not less than 90% of the rated load.

[0120] Example 3

[0121] In the embodiment of the present invention, Figure 1 As shown, a logistics company uses a multi-temperature zone cold storage refrigerated truck for food transportation. The refrigerated truck is divided into two temperature zones, including refrigerated temperature zone No. 1 (temperature zone 1) and frozen temperature zone No. 2 (temperature zone 2), which are used for the transportation of fresh fruits and vegetables and frozen meat respectively.

[0122] During the cold charging process, the parameter values ​​monitored by the sensor equipment are as follows:

[0123] For the cold charging unit, the cold charging unit data recorder monitors the cold charging time t charge = 5h; the power sensor at the power input end monitors the total power consumption during the cooling process W charge = 20kWh; the refrigerant inlet pipe temperature sensor monitors the refrigerant inlet temperature Ten,ref = -35℃; flow sensor monitors refrigerant flow M ref = 2kg / s; refrigerant outlet pipeline monitors refrigerant outlet temperature T ex,ref = -33°C.

[0124] For multi-temperature zone cold storage refrigerated vehicles, the vehicle compartment external temperature sensor monitors the ambient temperature T 0,c = 30℃; the temperature sensor in the car monitors the average temperature of the refrigerated temperature zone T bc,1 = 12℃, average temperature of freezing zone T bc,2 = -4℃; heat flux sensor monitors heat leakage heat flux density q in the refrigerated temperature zone leakc,1 = 20W / m 2 , heat leakage heat flux density q in the freezing temperature zone leakc,2 = 30W / m 2 ; Solar radiation sensor monitors solar radiation intensity q solarc,1 = q solarc,2 = 200W / m 2 .

[0125] For cold storage panels, the mass sensor at the bottom of the panel monitors the mass m of the phase change material in the cold storage temperature zone. pcm,1 = 200kg, mass of phase change material in freezing temperature zone m pcm,2 = 280kg; the temperature sensor inside the board monitors the temperature of the phase change material in the cold storage temperature zone at the beginning of cold charging T sc,1 =20℃, freezing temperature phase change material temperature T sc,2 = 10℃; monitor the phase change material temperature T in the cold storage temperature zone at the end of cold charging ec,1 = -5℃, freezing temperature phase change material temperature T ec,2 = -25℃.

[0126] During transportation, the sensor equipment monitors the following parameter values:

[0127] For multi-temperature zone cold storage refrigerated trucks, the on-board data recorder monitors the transportation time as t transport = 8h; the mass sensor at the bottom of the box monitors the mass of the goods in the refrigerated temperature zone m cargo,1 = 1000kg, mass of cargo in the refrigerated temperature zone m cargo,2 = 500kg; the car body external temperature sensor monitors the ambient temperature T 0,t = 30℃; the temperature sensor in the car monitors the average temperature of the refrigerated temperature zone T bt,1 =4℃, average temperature of freezing zone T bt,2 = -18℃; heat flux sensor monitors heat leakage heat flux density q in the refrigerated temperature zone leakt,1 = 35W / m 2 , heat leakage heat flux density q in the freezing temperature zone leakt,2= 45W / m 2 ; Solar radiation sensor monitors the solar radiation intensity q during the cooling process solart,1 = q solart,2 = 300W / m 2 ;

[0128] For cold storage panels, the mass sensor at the bottom of the panel monitors the mass m of the phase change material in the cold storage temperature zone. pcm,1 = 200kg, mass of phase change material in freezing temperature zone m pcm,2 = 280kg; the temperature sensor inside the board monitors the temperature of the phase change material in the refrigerated temperature zone at the beginning of transportation T st,1 =-5℃, the phase change material temperature in the freezing temperature zone is T st,2 = -25℃; monitor the phase change material temperature T in the refrigerated temperature zone after transportation et,1 = 2℃, freezing temperature phase change material temperature T et,2 = -20℃.

[0129] The data collector collects the monitoring values ​​of all sensor devices on the cold charging unit, multi-temperature zone cold storage refrigerated truck and cold storage board, and transmits them to the central control system wirelessly. The central control system analyzes the data in real time, combines the refrigerant physical parameters, phase change material physical parameters, box structure parameters and thermal parameters, and calculates various energy efficiency indicators and comprehensive energy efficiency index.

[0130] (1) Cold storage efficiency η ch The calculation method is as follows:

[0131] Physical parameters of phase change materials in cold storage temperature zone: Liquid relative heat c p,l1 = 2kJ / kg·℃, solid specific heat c p,s1 = 2kJ / kg·℃, phase transition temperature T f,1 = 0℃, material latent heat L1 = 200kJ / kg;

[0132] Physical parameters of phase change materials in freezing temperature range: Liquid relative heat capacity c p,l2 = 2kJ / kg·℃, solid specific heat c p,s2 = 2kJ / kg·℃, phase transition temperature T f,2 = -21℃, material latent heat L2 = 180kJ / kg.

[0133] The total cooling capacity of the refrigerated truck is:

[0134] ;

[0135] According to the total mass m of phase change material pcm = 480kg, cold charging time t charge = 5h, the cold storage efficiency can be obtained:

[0136] ;

[0137] (2) Cooling performance coefficient η ex,c The calculation method is as follows:

[0138] Refrigerant physical parameters: specific heat c p,ref = 2.5 kJ / kg·℃;

[0139] Refrigerated temperature zone box structure and thermal parameters: heat transfer area A b,1 = 25m 2 , heat transfer area of ​​the door gap A d,1 =0.5m 2 , solar radiation area A r,1 = 10m 2 , comprehensive heat transfer coefficient K1 = 0.24W / m 2 ℃, the radiation absorption rate of the box is α1=0.21;

[0140] Refrigeration temperature zone box structure and thermal parameters: heat transfer area A b,2 = 20m 2 , heat transfer area of ​​the door gap A d,2 =0.5m 2 , solar radiation area A r,2 = 8m 2 , comprehensive heat transfer coefficient K2 = 0.24W / m 2 ·℃, the radiation absorption rate of the box is α2=0.21.

[0141] The total cooling capacity of the refrigerant charged into the refrigerated truck, the heat dissipation of the i-th temperature zone to the external environment during the charging process, the heat leakage of the i-th temperature zone to the external environment during the charging process, and the solar radiation received by the i-th temperature zone during the charging process are respectively:

[0142] ;

[0143] ;

[0144] ;

[0145] ;

[0146] ;

[0147] ;

[0148] ;

[0149] The effective energy of the cold charging process is:

[0150] ;

[0151] According to the total power consumption W of the cooling process charge = 20kWh = 72000kJ, the cooling performance coefficient can be obtained:

[0152] ;

[0153] (3) Transport efficiency η tr The calculation method is as follows:

[0154] The refrigeration consumption during transportation is:

[0155] ;

[0156] According to the total mass of the transported goods m cargo = 1500kg, transportation time t transport = 8h, the transport efficiency is:

[0157] ;

[0158] (4) Cooling performance coefficient η ex,t The calculation method is as follows:

[0159] The heat dissipation of the i-th temperature zone to the external environment during transportation, the heat leakage of the i-th temperature zone to the external environment during transportation, and the solar radiation received by the i-th temperature zone during transportation are respectively:

[0160] ;

[0161] ;

[0162] ;

[0163] ;

[0164] ;

[0165] ;

[0166] The effective energy of the transport process is:

[0167] ;

[0168] The cooling performance coefficient is:

[0169] ;

[0170] (5) Comprehensive energy efficiency evaluation index η total The calculation of is as follows:

[0171] By setting weight coefficients ω1 = 0.4, ω2 = 0.3, and ω3 = 0.3, the comprehensive energy efficiency evaluation index is:

[0172] ;

[0173] According to the comprehensive energy efficiency evaluation index η total , energy efficiency can be divided into different levels. In this embodiment, the energy efficiency level classification standards are as follows:

[0174] First-level energy efficiency: η total ≥4.0;

[0175] Secondary energy efficiency: 3.5≤η total <4.0;

[0176] Level 3 energy efficiency: 3.0≤η total <3.5;

[0177] Level 4 energy efficiency: 2.5≤η total <3.0;

[0178] Five levels of energy efficiency: η total ≤2.5;

[0179] According to the above standards, the comprehensive energy efficiency evaluation index η of the refrigerated truck of this embodiment is obtained: total = 3.33, which is within the third-level energy efficiency range, indicating that the overall energy efficiency of the multi-temperature zone cold storage refrigerated truck system still has room for improvement, especially in terms of the cold charging performance coefficient and the cold releasing performance coefficient. It is possible to consider improving the performance of the cold charging equipment and reducing the energy loss during transportation.

[0180] Example 4

[0181] In addition to the above-mentioned methods and systems, an embodiment of the present application may also be a computer program product, which includes computer program instructions, which, when executed by a processor, enable the processor to execute the steps of the decision-making behavior decision method according to various embodiments of the present application described in the above-mentioned embodiment 2 of this specification.

[0182] The computer program product may be written in any combination of one or more programming languages ​​to write program codes for performing the operations of the embodiments of the present application, including object-oriented programming languages, such as Java, C++, etc., and conventional procedural programming languages, such as "C" language or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as an independent software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0183] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An energy efficiency evaluation method for multi-temperature zone cold storage refrigerated vehicles, It is characterized in that Calculate energy efficiency indicators, including the cold storage efficiency and cold charging performance coefficient during the cold charging process, and the transportation efficiency and cold release performance coefficient during the transportation process; the cold storage efficiency and transportation efficiency are calculated based on the first law of thermodynamics, and are used to evaluate the energy storage level of the refrigerated truck during the cold charging process and the energy release level of the refrigerated truck during the transportation process; the cold charging performance coefficient and cold release performance coefficient are calculated based on the second law of thermodynamics, and are used to evaluate the effective energy utilization level during the cold charging process and the transportation process; Calculate the comprehensive energy efficiency evaluation index based on the values ​​of various energy efficiency indicators; The comprehensive energy efficiency rating index is used for energy efficiency evaluation; The cold storage efficiency represents the amount of cold charged into a unit mass of the phase change material per unit time during the cold charging process; The transport efficiency represents the amount of cold consumed in transporting a unit mass of goods per unit time during the transport process.

2. The energy efficiency evaluation method for a multi-temperature zone cold storage refrigerated vehicle according to claim 1, It is characterized in that Cold storage efficiency η ch The calculation formula to characterize the cold amount charged into unit mass phase change material per unit time during the cold charging process is: ； Among them, m pcm is the total mass of the phase change material, which is the sum of the mass of the phase change material in each temperature zone; Q pcm,c is the total cooling capacity obtained by the refrigerated truck, which is the sum of the cooling capacity of the cold storage plates in each temperature zone; t charge It is the duration of cold charging; ； Among them, m pcm,i is the mass of phase change material in the i-th temperature zone; c p,li is the liquid phase heat of the phase change material in the i-th temperature zone; c p,si is the solid-state relative heat of the phase change material in the i-th temperature zone; T f,i is the phase change point temperature of the phase change material in the i-th temperature zone; L i is the latent heat of the phase change material in the i-th temperature zone; T sc,i is the phase change material temperature of the ith temperature zone at the beginning of cold charging; T ec,i is the temperature of the phase change material in the i-th temperature zone at the end of cold charging.

3. The energy efficiency evaluation method for a multi-temperature zone cold storage refrigerated vehicle according to claim 1, It is characterized in that Cooling performance coefficient η ex,c Reflects the effective energy utilization rate in the cold charging process, and the calculation formula is: ； Among them, Q useful,c is the effective energy of the cooling process; W charge is the total power consumption of the cooling process; ； Among them, Q ref The total cooling capacity of the refrigerant charged into the refrigerated truck; Q lossc,i Q is the amount of heat dissipated from the i-th temperature zone to the external environment during the cold charging process; leakc,i Q is the heat leakage from the i-th temperature zone to the external environment during the cold charging process; solarc,i is the amount of solar radiation received by the i-th temperature zone during the cooling process; ； ； ； ； Among them, c p,ref is the specific heat capacity of the refrigerant; M ref is the refrigerant mass flow rate; T ex,ref is the refrigerant outlet temperature of the refrigerated truck; T en,ref is the refrigerant inlet temperature of the refrigerated truck; t charge K is the cold charging time; i A is the comprehensive heat transfer coefficient of the box in the i-th temperature zone; b,i is the heat transfer area of ​​the box in the i-th temperature zone; T 0,c T is the external environment temperature during the cold charging process; bc,i is the temperature inside the box in the i-th temperature zone during the cold charging process; q leakc,i A is the heat leakage heat flux density of the i-th temperature zone during the cold charging process; d,i is the heat transfer area of ​​the box door gap in the i-th temperature zone; α i A is the radiation absorption rate of the box material in the i-th temperature zone; r,i is the solar radiation area of ​​the box in the i-th temperature zone; q solarc,i is the solar radiation intensity of the i-th temperature zone during the cooling process.

4. The energy efficiency evaluation method for a multi-temperature zone cold storage refrigerated vehicle according to claim 1, It is characterized in that Transport efficiency η tr It represents the amount of cold consumed by transporting a unit mass of goods per unit time during transportation. The calculation formula is: ； Among them, m cargo is the total mass of the transported goods, which is the sum of the masses of the goods in each temperature zone; Q pcm,t is the total cooling consumption during the transportation process, and is the sum of the cooling consumption of the cold storage plates in each temperature zone; t transport The duration of transportation; ； Among them, m pcm,i is the mass of phase change material in the i-th temperature zone; c p,li is the liquid phase heat of the phase change material in the i-th temperature zone; c p,si is the solid-state relative heat of the phase change material in the i-th temperature zone; T f,i is the phase change point temperature of the phase change material in the i-th temperature zone; L i is the latent heat of the phase change material in the i-th temperature zone; T et,i T is the temperature of the phase change material in the i-th temperature zone at the end of transportation; st,i is the temperature of the phase change material in the i-th temperature zone at the beginning of transportation.

5. The energy efficiency evaluation method for a multi-temperature zone cold storage refrigerated vehicle according to claim 1, It is characterized in that Cooling performance coefficient η ex,t Reflects the effective energy utilization rate during transportation. The calculation formula is: ； Among them, Q useful,t is the effective energy of the transport process; Q pcm,t is the total cooling consumption during the transportation process, which is the sum of the cooling consumption of the cold storage plates in each temperature zone; ； Among them, m pcm,i is the mass of phase change material in the i-th temperature zone; c p,li is the liquid phase heat of the phase change material in the i-th temperature zone; c p,si is the solid-state relative heat of the phase change material in the i-th temperature zone; T f,i is the phase change point temperature of the phase change material in the i-th temperature zone; L i is the latent heat of the phase change material in the i-th temperature zone; T et,i is the phase change material temperature in the i-th temperature zone at the end of transportation; T st,i is the temperature of the phase change material in the i-th temperature zone at the beginning of transportation; ； Among them, Q pcm,t is the total refrigeration consumption during the transportation process; Q losst,i Q is the amount of heat dissipated from the i-th temperature zone to the external environment during transportation; leakt,i Q is the heat leakage from the i-th temperature zone to the external environment during transportation, solart,i is the amount of solar radiation received by the i-th temperature zone during transportation; ； ； ； Among them, K i A is the comprehensive heat transfer coefficient of the box in the i-th temperature zone; b,i is the heat transfer area of ​​the box in the i-th temperature zone; T 0,t is the external environment temperature during transportation; T bt,i is the temperature inside the box in the i-th temperature zone during transportation; t transport is the transportation time; q leakt,i is the heat leakage heat flux density of the i-th temperature zone during transportation; A d,i is the heat transfer area of ​​the box door gap in the i-th temperature zone; α i A is the radiation absorption rate of the box material in the i-th temperature zone; r,i is the solar radiation area of ​​the box in the i-th temperature zone; q solart,i is the solar radiation intensity in the i-th temperature zone during transportation.

6. The energy efficiency evaluation method for a multi-temperature zone cold storage refrigerated vehicle according to claim 1, It is characterized in that Comprehensive energy efficiency evaluation index η total for: ； Among them, η ch , η tr , η ex,c , η ex,t They represent the cold storage efficiency, transportation efficiency, cold charging performance coefficient and cold releasing performance coefficient respectively; ω 1 ,ω 2 ,ω 3 All are weight coefficients; comprehensive energy efficiency evaluation index η total The larger the value, the better the energy efficiency evaluation of the refrigerated truck.

7. An energy efficiency evaluation and monitoring system for multi-temperature zone cold storage refrigerated vehicles, It is characterized in that An energy efficiency evaluation method for a multi-temperature zone cold storage refrigerated vehicle applicable to any one of claims 1 to 6 above, the system comprising: a refrigerated vehicle (1) and a cold charging unit (6); The refrigerated vehicle (1) is divided into a plurality of temperature zones, each of which is provided with a cold storage plate (4); a phase change material is provided in the cold storage plate (4); The refrigerated truck (1) includes two processes: refrigeration and transportation; During the cold charging process, the cold charging unit (6) is connected to the power supply (5), and the cold energy of the cold charging unit (6) is transferred to the phase change material in the cold storage plate (4) of each temperature zone on the refrigerated vehicle (1) through the refrigerant; the refrigerant in the cold charging unit (6) flows into the cold storage plate (4) of each temperature zone through the refrigerant inlet pipeline (7), and after heat exchange with the phase change material in the cold storage plate (4) of each temperature zone, flows out of the cold storage plate (4) of each temperature zone through the refrigerant outlet pipeline (8) and flows back to the cold charging unit (6); During transportation, the refrigerated truck (1) is independent of the cold charging unit (6), and each temperature zone releases cold through the cold storage plate (4) to maintain the temperature of each temperature zone.

8. The energy efficiency evaluation and monitoring system for a multi-temperature zone cold storage refrigerated vehicle according to claim 7, It is characterized in that Different sensor devices are respectively installed on the cold charging unit (6), the refrigerated vehicle (1) and the cold storage plate (4); The cold charging unit (6) monitors the cold charging time t through the cold charging unit data recorder (22). charge ; Install an energy sensor (21) at the power input end of the cold charging unit to monitor the total power consumption W of the cold charging process charge A refrigerant inlet temperature sensor (18) and a flow sensor (19) are installed on the refrigerant inlet pipeline (7) to monitor the refrigerant inlet temperature T en , ref and refrigerant mass flow rate M ref ; Install a refrigerant outlet temperature sensor (20) on the refrigerant outlet pipeline (8) to monitor the refrigerant outlet temperature T ex , ref ; The refrigerated truck (1) monitors the transportation time t via an onboard data recorder (23) transport ; Install an in-box temperature sensor (11) in each temperature zone to monitor the in-box temperature in each temperature zone; install an ambient temperature sensor (17) on the outside of the box to monitor the ambient temperature; install a door heat flux sensor (12) at the door gap of each temperature zone to monitor the heat leakage heat flux density of each temperature zone; install a solar radiation sensor (14) at the outside of the box of each temperature zone where the sun can directly shine, to monitor the solar radiation intensity of each temperature zone; install a box mass sensor (13) at the bottom of the box of each temperature zone to monitor the quality of the goods in each temperature zone; The cold storage plate (4) has a cold storage plate temperature sensor (10) installed inside the cold storage plate (4) for monitoring temperature changes of the phase change material inside the cold storage plate (4); and a cold storage plate mass sensor (9) installed at the bottom of the cold storage plate (4) for monitoring the mass of the phase change material inside the cold storage plate (4).

9. The energy efficiency evaluation and monitoring system for a multi-temperature zone cold storage refrigerated vehicle according to claim 8, It is characterized in that A data collector (15) and a central control system (16) are provided on the refrigerated truck (1); the data collector (15) collects monitoring values ​​of all sensor devices on the cold charging unit (6), the refrigerated truck (1) and the cold storage plate (4), and transmits the values ​​to the central control system (16) by wireless means; the central control system (16) performs real-time analysis on the data, calculates various energy efficiency indicators and a comprehensive energy efficiency evaluation index, and performs energy efficiency evaluation.

10. A computer program product, It is characterized in that It includes a computer program / instruction, which, when executed by a processor, implements an energy efficiency evaluation method for a multi-temperature zone cold storage refrigerated vehicle as described in any one of claims 1-6.

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