Temperature control method for tank type storage and transportation equipment

Abstract

The invention relates to the technical field of tank-type storage and transportation equipment, and discloses a tank-type storage and transportation equipment temperature control method, which comprises the following steps: acquiring a heat transfer coefficient of tank-type storage and transportation equipment to an environment through a heat transfer coefficient test strategy, judging whether the heat transfer coefficient is valid or not, and if not, adopting a thermal insulation performance definition value of the equipment as the heat transfer coefficient; selecting a working mode according to the working condition of the cargo temperature sensor, and calculating the time length required by cargo temperature adjustment; in the adjusting process, the temperature of the cold and hot carrier is monitored and controlled in real time, the temperature adjusting duration is divided into discontinuous adjusting duration blocks, and the system conducts heating and cooling work in the blocks; the system recovers the temperature of the cold and hot carriers outside the blocks; through an accurate temperature control strategy, efficient temperature management of the tank type storage and transportation equipment under different working conditions is achieved, and safe storage and transportation of goods are guaranteed.

Description

[0001] This application is a divisional application of the application filed on September 27, 2024, with application number 202411362294.2 and invention name “A temperature control system and control method for tank storage and transportation equipment”. Technical Field

[0002] The invention relates to the technical field of tank storage and transportation equipment, and in particular to a temperature control method for tank storage and transportation equipment. Background Art

[0003] Tank storage and transportation equipment is widely used in the long-distance transportation and storage of liquid or gaseous goods, such as petroleum, chemical raw materials and liquefied natural gas. These goods are extremely sensitive to changes in ambient temperature. Errors in temperature control may cause changes in the properties of the goods and even cause safety accidents. Therefore, ensuring the stability of the temperature of the goods during storage and transportation is the key to ensuring their quality and safety.

[0004] The current temperature control system of tank storage and transportation equipment mainly measures the temperature of the cargo and the temperature of the hot and cold carriers in real time, and feeds the measured values ​​back to the controller. By comparing the actual measured values ​​with the target values, the start and stop actions of the heating and cooling temperature control system are controlled, thereby achieving temperature control of the stored and transported cargo; the traditional control method needs to rely entirely on the temperature sensor to measure the temperature of the cargo and the temperature of the hot and cold carriers in real time. When any temperature sensor fails, the system will be completely unable to operate; the traditional control method will control the temperature of the hot and cold carriers to form a predetermined temperature difference with the cargo temperature, and through the temperature difference, heat is transferred from the high temperature side to the low temperature side, thereby achieving heating, cooling or temperature maintenance of the cargo; however, too small a temperature difference will slow down the heating and cooling speed, while too large a temperature difference will cause large temperature fluctuations, making it difficult to achieve high temperature control accuracy; at the same time, continuous heating or cooling will damage the hot and cold carriers, and will also cause excessive temperature fluctuations in local cargo;

[0005] In summary, there is an urgent need for a temperature control method for tank storage and transportation equipment, which can achieve precise control of cargo temperature and extend the service life of cold and hot carriers through accurate heat transfer coefficient measurement, flexible temperature control mode selection, dynamic temperature adjustment strategy and emergency mode design. Summary of the invention

[0006] The present invention provides a temperature control method for tank storage and transportation equipment, which helps solve the problems mentioned in the above background technology.

[0007] The present invention provides the following technical solution: a temperature control method for tank storage and transportation equipment, specifically comprising:

[0008] According to the heat transfer coefficient test strategy, the heat transfer coefficient of the tank storage and transportation equipment to the environment is obtained and recorded as the first coefficient;

[0009] Determine whether the first coefficient is valid;

[0010] Obtain the thermal insulation performance definition value of the tank storage and transportation equipment and record it as the second coefficient;

[0011] Set deviation thresholds;

[0012] like The first coefficient is deemed valid and is selected as the total heat transfer coefficient of the tank storage and transportation equipment to the environment;

[0013] like The first coefficient is deemed invalid, and the second coefficient is selected as the total heat transfer coefficient of the tank storage and transportation equipment to the environment;

[0014] The total heat transfer coefficient of the tank storage and transportation equipment to the environment is recorded as K;

[0015] Select the working mode according to the damage of the cargo temperature sensor;

[0016] Obtain the cargo temperature adjustment duration according to the cargo temperature adjustment duration acquisition strategy;

[0017] While adjusting the temperature of the cargo, detect and control the temperature of the hot and cold carriers;

[0018] Divide the cargo temperature adjustment time into discrete cargo temperature adjustment time blocks;

[0019] Adjust the temperature of cargo and cold and hot carriers within each cargo temperature adjustment time block;

[0020] Outside of each cargo temperature adjustment time block, suspend temperature adjustment and restore the temperature of the cold and hot carriers;

[0021] When the cargo temperature reaches the cargo target temperature, it enters the temperature maintenance mode.

[0022] Optionally, the test of obtaining the total heat transfer coefficient of the tank storage and transportation equipment to the environment according to the heat transfer coefficient test strategy specifically includes:

[0023] Get the volume of the test cargo, recorded as V 测 ;

[0024] Get the density of the test cargo, denoted as ρ 测 ;

[0025] Get the specific heat capacity of the test cargo, recorded as C 测 ;

[0026] Place the test goods in a tank storage and transportation device for testing;

[0027] Get the unit duration of the natural temperature rise and fall cycle, recorded as T 测 ;

[0028] The unit time of the natural temperature rise and fall cycle is divided into several small recording cycles, which are recorded as S1, S2...S R ;

[0029]

[0030] For each small recording period;

[0031] Obtain the difference between the average ambient temperature and the average cargo temperature in the short recording period, which are recorded as ΔT1, ΔT2, ΔT3, ... ΔT R ;

[0032] Calculate the average temperature difference ΔT between the cargo temperature and the ambient temperature during the natural temperature rise and fall cycle n ;

[0033]

[0034] Calculate the first coefficient using the following formula:

[0035] Where K0 is the first coefficient, V 测 The volume of the test cargo, ρ 测 To test the density of the cargo, C 测 To test the specific heat capacity of the cargo, ΔT n is the average temperature difference between the cargo temperature and the ambient temperature during the natural heating and cooling cycle, T 测 It is the unit duration of natural temperature rise and fall cycle.

[0036] Optionally, the selecting of the working mode according to the damage condition of the cargo temperature sensor specifically includes:

[0037] For each sensor, determine whether the sensor is damaged;

[0038] If the sensor is not damaged, the system automatically obtains the required data, and then obtains the cargo temperature adjustment time according to the cargo temperature adjustment time acquisition strategy;

[0039] If the sensor is damaged, select the emergency mode to manually input the required data to control the operation of the equipment, and then obtain the cargo temperature adjustment time according to the cargo temperature adjustment time acquisition strategy.

[0040] Optionally, obtaining the cargo temperature adjustment time according to the cargo temperature adjustment time acquisition strategy specifically includes:

[0041] Get the initial temperature of the cargo, recorded as T1;

[0042] Get the target temperature of the cargo, recorded as T2;

[0043] Get the ambient temperature, recorded as T环 ;

[0044] Calculate the average temperature difference ΔT between the environment and the cargo m ;

[0045] ΔT m =[(T 环 -T1)+(T 环 -T2)]÷2;

[0046] Get the volume of the cargo, denoted as V 货 ;

[0047] Get the density of the cargo, denoted as ρ 货 ;

[0048] Get the specific heat capacity of the cargo, denoted as C 货 ;

[0049] Calculate the heat transfer power of the environment to the cargo using the following formula:

[0050] P0=ΔT m ×K; where ΔT m is the average temperature difference between the environment and the cargo, and K is the total heat transfer coefficient of the tank storage and transportation equipment to the environment.

[0051] Optionally, the obtaining of the cargo temperature adjustment time according to the cargo temperature adjustment time obtaining strategy further includes:

[0052] Calculate the work required to heat and cool the cargo using the following formula:

[0053] W=V 货 ×ρ 货 ×C 货 ×|T2-T1|; where W is the value of the work required to heat and cool the cargo, V 货 is the volume of the cargo, ρ 货 is the density of the cargo, C 货 is the specific heat capacity of the cargo, T2 is the target temperature of the cargo, and T1 is the initial temperature of the cargo;

[0054] Obtain the heating power of the tank storage and transportation equipment, recorded as P1;

[0055] Get the refrigeration power of the tank storage and transportation equipment, recorded as P2;

[0056] Calculate the total heating power of the cargo affected by the heating carrier and the environment. The total heating power of the cargo affected by the heating carrier and the environment is calculated by the following formula:

[0057] P 热 =P0+P1; where P 热is the total heating power of the cargo affected by the heating carrier and the environment, P0 is the heat transfer power of the environment to the cargo, and P1 is the heating power of the tank storage and transportation equipment;

[0058] Calculate the total refrigeration power of the cargo affected by the refrigeration carrier and the environment. The total refrigeration power of the cargo affected by the refrigeration carrier and the environment is calculated using the following formula:

[0059] P 冷 =P2-P0; where P 冷 It is the total refrigeration power of the cargo affected by the refrigeration carrier and the environment, P0 is the heat transfer power of the environment to the cargo, and P2 is the refrigeration power of the tank storage and transportation equipment.

[0060] Optionally, the step of obtaining the cargo temperature adjustment time according to the cargo temperature adjustment time acquisition strategy further includes:

[0061] If the target temperature of the cargo is greater than the initial temperature of the cargo, the cargo needs to be heated;

[0062] Calculate the cargo heating time and total interval time using the following formula:

[0063]

[0064] Where T 热 The heating time of the goods, T 热隔 is the total heating interval duration, is the total heating interval duration coefficient, W is the value of the work required to heat the cargo, P 热 is the total heating power of the cargo affected by the heating carrier and the environment, and P0 is the heat transfer power of the environment to the cargo;

[0065] If the target temperature of the cargo is lower than the initial temperature of the cargo, the cargo needs to be refrigerated;

[0066] Calculate the cargo refrigeration time and the total interval time. Calculate the cargo refrigeration time and the total interval time using the following formula:

[0067]

[0068] Where T 冷 is the refrigeration time of the goods, T 冷隔 is the total cooling interval duration, is the total refrigeration interval duration coefficient, W is the value of the work required to cool the cargo, P 冷 is the total refrigeration power of the cargo affected by the refrigeration carrier and the environment, and P0 is the heat transfer power of the environment to the cargo;

[0069] Get the sum of the cargo heating time and the total heating interval time or the sum of the cargo cooling time and the total cooling interval time, and record it as the cargo temperature adjustment time T 调 .

[0070] Optionally, dividing the cargo temperature adjustment time into discontinuous cargo temperature adjustment time blocks specifically includes:

[0071] The cargo temperature adjustment time is divided into discontinuous cargo temperature adjustment time blocks according to the time when the cold and hot carriers start working and the time when they stop working, which are respectively recorded as the first adjustment block, the second adjustment block...the Ath adjustment block;

[0072] The moment each adjustment block starts is the moment when the cold and hot carriers start working;

[0073] The moment when each adjustment block ends is the moment when the cold and hot carriers finish working;

[0074] The cold and hot carriers perform heating and cooling work within each cargo temperature adjustment time block to adjust the temperature of the cargo;

[0075] The cold and hot carriers suspend heating and cooling work in the interval block outside each cargo temperature adjustment time block to restore the temperature of the cold and hot carriers;

[0076] Heating the goods for T 热 Divided into A blocks, the total heating interval is T 热隔 It is divided into A-1 blocks.

[0077]

[0078] The heating adjustment process is T 热1 , T 热隔1 , T 热2 , T 热隔2 ,…,T 热隔A-1 , T 热A ;

[0079] Refrigerate the goods for T 冷 Divided into B blocks, the total heating interval time is T 冷隔 It is divided into B-1 blocks;

[0080]

[0081] The cooling adjustment process is T 冷1 , T 冷隔1 , T 冷2 , T 冷隔2 ,…,T 冷隔B-1 , T 冷B ;

[0082] Set the heating carrier limit temperature, denoted as T 热限;

[0083] Set the heating carrier recovery temperature, denoted as T 热恢 ;

[0084] Set the cooling medium limit temperature, denoted as T 冷限 ;

[0085] Set the refrigeration medium recovery temperature, denoted as T 冷恢 ;

[0086] Get the real-time temperature of the goods, denoted as T 货 ;

[0087] If T1 <T2;

[0088] When the real-time temperature of the goods is T 货 When the target temperature T2 of the cargo is not reached, the heating function is activated;

[0089] Get the temperature of the heating carrier, denoted as T 热载 ;

[0090] When T 热载 ≥T 热限 When the heating carrier stops working;

[0091] When T 热载 From T 热限 Reduce to T 热恢 When , the heating carrier starts to work;

[0092] When the real-time temperature of the goods is T 货 When the temperature reaches the target temperature T2 of the cargo for the first time, the heating carrier stops working and enters the temperature maintenance mode;

[0093] If T1>T2;

[0094] When the real-time temperature of the goods is T 货 When the target temperature T2 of the cargo is not reached, the refrigeration function is activated;

[0095] Get the temperature of the cooling medium, denoted as T 冷载 ;

[0096] When T 冷载 ≤T 冷限 When the refrigeration carrier stops working;

[0097] When T 冷载 From T 冷限 Rise to T 冷恢 When the refrigeration carrier starts to work;

[0098] When the real-time temperature of the goods is T 货 When the temperature reaches the target temperature T2 of the cargo for the first time, the refrigeration carrier stops working and enters the temperature maintenance mode.

[0099] Optionally, when the cargo temperature reaches the cargo target temperature, entering the temperature maintenance mode specifically includes:

[0100] Get the real-time temperature T of the goods 货 、Ambient temperature T 环 , initial temperature of cargo T1, target temperature of cargo T2, heat transfer power of environment to cargo P0, heating power of tank storage and transportation equipment P1 and cooling power of tank storage and transportation equipment P2;

[0101] Set the upper and lower precision values ​​of the control, the upper precision value is recorded as X1, and the lower precision value is recorded as X2;

[0102] Get the cargo temperature adjustment duration and interval duration according to the cargo temperature adjustment duration acquisition strategy in the maintenance mode:

[0103] If T2>T 环 ;

[0104] Get the total heating interval duration coefficient in maintenance mode

[0105]

[0106] α is the setting coefficient of the total heating interval duration in the maintenance mode, P 热 is the total heating power of the cargo affected by the heating carrier and the environment, and P0 is the heat transfer power of the environment to the cargo;

[0107] Set the standard temperature maintenance mode heating block unit time T 热维 ;

[0108] The interval block unit duration is

[0109] The standard temperature maintenance mode is to alternately heat the block units and space the block units;

[0110] When the real-time temperature of the goods is T 货 When the cargo target temperature reaches the upper limit of accuracy T2+X1, the heating carrier stops working and records the total heating maintenance time T 热维总 =∑T 热维i +∑T 热隔维i ;

[0111] Calculate the system's extra heat W1 = V 货 ×ρ 货 ×C 货 ×X1;

[0112] Calculate the extra heating power of the system in the temperature heating maintenance range

[0113] Adjust to get the new total heating interval time coefficient

[0114] In this way, we get the new unit interval duration T 热隔维 ';

[0115] When the real-time temperature of the goods is T 货 When the cargo target temperature accuracy lower limit T2-X2 is reached, the total heating maintenance time T is recorded. 热维总 =∑T 热维i +∑T 热隔维i ;

[0116] Calculate the minimum heat of the system W2 = V 货 ×ρ 货 ×C 货 ×X2;

[0117] Calculate the heating power that the system lacks in the temperature heating maintenance range

[0118] Adjust to get the new total heating interval time coefficient

[0119] In this way, we get the new unit interval duration T 热隔维 ”;

[0120] If T2 <T 环 , then refrigeration maintenance is required;

[0121] Get the total cooling interval duration coefficient in maintenance mode

[0122]

[0123] β is the setting coefficient P of the total heating interval duration in the maintenance mode 冷 is the total heating power of the cargo affected by the refrigeration carrier and the environment, and P0 is the heat transfer power of the environment to the cargo;

[0124] Set the standard temperature maintenance mode cooling block unit time T 冷维 ;

[0125] The interval block unit duration is

[0126] The standard temperature maintenance mode refrigeration block units and spacing block units are operated alternately;

[0127] When the real-time temperature of the goods is T 货 When the cargo target temperature accuracy lower limit T2-X2 is reached, the refrigeration carrier stops working and the total refrigeration maintenance time T is recorded. 冷维总 =∑T 冷维i +∑T 冷隔维i ;

[0128] Calculate the heat missing from the system W2 = V 货 ×ρ 货 ×C 货 ×X2;

[0129] Calculate the extra cooling power of the system in the temperature cooling maintenance range

[0130] Adjust to get the new total cooling interval duration coefficient

[0131] In this way, we get the new unit interval duration T 冷隔维 ';

[0132] When the real-time temperature of the goods is T 货 When the cargo target temperature accuracy upper limit T2+X1 is reached, the total refrigeration maintenance time T is recorded. 冷维总 =∑T 冷维i +∑T 冷隔维i ;

[0133] Calculate the system's extra heat W1 = V 货 ×ρ 货 ×C 货 ×X1;

[0134] Calculate the cooling power required by the system in the temperature cooling maintenance range

[0135] Adjust to get the new total cooling interval duration coefficient

[0136] In this way, we get the new unit interval duration T 冷隔维 ”.

[0137] The present invention has the following beneficial effects:

[0138] 1. A temperature control method for tank storage and transportation equipment obtains the heat transfer coefficient of the tank storage and transportation equipment to the environment through a heat transfer coefficient test strategy, and can accurately evaluate the thermal insulation performance of the equipment; by testing the first coefficient and the second coefficient, and judging according to the deviation threshold, it can ensure that the most accurate heat transfer coefficient is selected for subsequent temperature control; the advantage of this method is that the test strategy can provide the real heat transfer coefficient under the actual operating environment, which is closer to reality than simply relying on equipment design parameters; reliability: by setting the deviation threshold, it is possible to identify whether the heat transfer coefficient is valid, and this double verification mechanism improves the reliability of the data; flexibility: if the first coefficient is invalid, it can also fall back to the second coefficient, ensuring the continuity and stability of the system.

[0139] 2. In this method of temperature control for tank storage and transportation equipment, sensors may fail in actual applications. Intelligent selection of working modes can ensure that the system can still operate normally when the sensor fails. The advantage of this function is that the system can identify the working status of the sensor and automatically switch to emergency mode to reduce the impact caused by sensor failure. Even if some sensors are damaged, the system can still continue to operate by manually inputting data to ensure that the temperature control of the goods will not be interrupted.

[0140] 3. This method of temperature control for tank storage and transportation equipment can better control the heating and cooling process and avoid the impact of extreme temperatures on goods by setting the limit temperature and recovery temperature of the heating carrier and the cooling carrier. Its advantages include: preventing the heating carrier and the cooling carrier from being too high or too low in temperature, protecting goods and equipment; ensuring that the system operates within a safe temperature range through dynamic monitoring and control; avoiding the equipment from operating under extreme conditions, reducing the probability of wear and failure, and extending the service life of the equipment.

[0141] 4. This temperature control method for tank storage and transportation equipment can control the temperature adjustment process more flexibly by dividing the temperature adjustment time into multiple intermittent blocks. The system performs cooling or heating within the predetermined blocks; it can avoid excessive fluctuations in the temperature of the goods within a period of time; the system restores the temperature of the cold and hot carriers outside the predetermined blocks, dynamically adjusts and controls the temperature, and ensures that the temperature of the goods is within the set range; the advantage of this strategy is that it can be dynamically adjusted according to the real-time temperature and control accuracy to ensure that the temperature of the goods does not fluctuate too much; avoid unnecessary heating and cooling, and achieve efficient use of energy through precise control.

[0142] 5. A temperature control method for tank storage and transportation equipment. When the temperature of the cargo reaches the target temperature, the system enters the temperature maintenance mode and ensures the stability of the cargo temperature by setting the control accuracy. Traditional temperature control methods often lack a temperature maintenance mechanism and are prone to temperature fluctuations after reaching the target temperature, affecting the quality of the cargo. The temperature maintenance mode sets the control accuracy and fine-tunes the working cycle of the heating or cooling carrier to ensure that the cargo temperature remains stable near the target temperature. This method can effectively avoid the impact of temperature fluctuations on the cargo. In addition, the temperature maintenance mode can also reduce the working time of the heating or cooling carrier, reduce energy consumption and equipment wear, and improve the operating efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0143] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0144] 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.

[0145] Example, see Figure 1 , a temperature control method for tank storage and transportation equipment, specifically comprising:

[0146] According to the heat transfer coefficient test strategy, the heat transfer coefficient of the tank storage and transportation equipment to the environment is obtained and recorded as the first coefficient;

[0147] Determine whether the first coefficient is valid;

[0148] Obtain the thermal insulation performance definition value of the tank storage and transportation equipment and record it as the second coefficient;

[0149] Set deviation thresholds;

[0150] like The first coefficient is deemed valid and is selected as the total heat transfer coefficient of the tank storage and transportation equipment to the environment;

[0151] like The first coefficient is deemed invalid, and the second coefficient is selected as the total heat transfer coefficient of the tank storage and transportation equipment to the environment;

[0152] The total heat transfer coefficient of the tank storage and transportation equipment to the environment is recorded as K;

[0153] The temperature control method of a tank storage and transportation equipment obtains the heat transfer coefficient of the tank storage and transportation equipment to the environment through a heat transfer coefficient test strategy, and can accurately evaluate the thermal insulation performance of the equipment; by testing the first coefficient and the second coefficient, and judging according to the deviation threshold, it can ensure that the most accurate heat transfer coefficient is selected for subsequent temperature control; the advantage of this method is that the test strategy can provide the real heat transfer coefficient under the actual operating environment, which is closer to reality than simply relying on equipment design parameters; reliability: by setting the deviation threshold, it can be identified whether the heat transfer coefficient is valid, and this double verification mechanism improves the reliability of the data; flexibility: if the first coefficient is invalid, it can also fall back to the second coefficient, ensuring the continuity and stability of the system;

[0154] Select the working mode according to the damage of the cargo temperature sensor;

[0155] Obtain the cargo temperature adjustment duration according to the cargo temperature adjustment duration acquisition strategy;

[0156] While adjusting the temperature of the cargo, detect and control the temperature of the hot and cold carriers;

[0157] Divide the cargo temperature adjustment time into discrete cargo temperature adjustment time blocks;

[0158] Adjust the temperature of cargo and cold and hot carriers within each cargo temperature adjustment time block;

[0159] Outside of each cargo temperature adjustment time block, suspend temperature adjustment and restore the temperature of the cold and hot carriers;

[0160] When the cargo temperature reaches the cargo target temperature, it enters the temperature maintenance mode.

[0161] The method of obtaining the total heat transfer coefficient of the tank storage and transportation equipment to the environment according to the heat transfer coefficient test strategy specifically includes:

[0162] Get the volume of the test cargo, recorded as V 测 ;

[0163] Get the density of the test cargo, denoted as ρ 测 ;

[0164] Get the specific heat capacity of the test cargo, recorded as C 测 ;

[0165] Place the test goods in a tank storage and transportation device for testing;

[0166] Get the unit duration of the natural temperature rise and fall cycle, recorded as T 测 ;

[0167] The unit time of the natural temperature rise and fall cycle is divided into several small recording cycles, which are recorded as S1, S2...S R ;

[0168]

[0169] For each small recording period;

[0170] Obtain the difference between the average ambient temperature and the average cargo temperature in the short recording period, which are recorded as ΔT1, ΔT2, ΔT3, ... ΔT R ;

[0171] Calculate the average temperature difference ΔT between the cargo temperature and the ambient temperature during the natural temperature rise and fall cycle n ;

[0172]

[0173] Calculate the first coefficient using the following formula:

[0174] Where K0 is the first coefficient, V 测 The volume of the test cargo, ρ 测To test the density of the cargo, C 测 To test the specific heat capacity of the cargo, ΔT n is the average temperature difference between the cargo temperature and the ambient temperature during the natural heating and cooling cycle, T 测 It is the unit duration of natural temperature rise and fall cycle.

[0175] The selecting of the working mode according to the damage condition of the cargo temperature sensor specifically includes:

[0176] For each sensor, determine whether the sensor is damaged;

[0177] If the sensor is not damaged, the system automatically obtains the required data, and then obtains the cargo temperature adjustment time according to the cargo temperature adjustment time acquisition strategy;

[0178] If the sensor is damaged, select the emergency mode to manually input the required data to control the operation of the equipment, and then obtain the cargo temperature adjustment time according to the cargo temperature adjustment time acquisition strategy;

[0179] A method for controlling the temperature of tank storage and transportation equipment. In actual applications, sensors may fail. Intelligent selection of working modes can ensure that the system can still operate normally when the sensor fails. The advantage of this function is that the system can identify the working status of the sensor and automatically switch to the emergency mode to reduce the impact caused by the sensor failure. Even if some sensors are damaged, the system can still continue to operate by manually inputting data to ensure that the temperature control of the goods will not be interrupted.

[0180] The step of obtaining the cargo temperature adjustment time according to the cargo temperature adjustment time acquisition strategy specifically includes:

[0181] Get the initial temperature of the cargo, recorded as T1;

[0182] Get the target temperature of the cargo, recorded as T2;

[0183] Get the ambient temperature, recorded as T 环 ;

[0184] Calculate the average temperature difference ΔT between the environment and the cargo m ;

[0185] ΔT m =[(T 环 -T1)+(T 环 -T2)]÷2;

[0186] Get the volume of the cargo, denoted as V 货 ;

[0187] Get the density of the cargo, denoted as ρ 货 ;

[0188] Get the specific heat capacity of the cargo, denoted as C 货 ;

[0189] Calculate the heat transfer power of the environment to the cargo using the following formula:

[0190] P0=ΔT m ×K; P0 is the heat transfer power of the environment to the cargo, ΔT m is the average temperature difference between the environment and the cargo, and K is the total heat transfer coefficient of the tank storage and transportation equipment to the environment.

[0191] The step of obtaining the cargo temperature adjustment time according to the cargo temperature adjustment time acquisition strategy further includes:

[0192] Calculate the work required to heat and cool the cargo using the following formula:

[0193] W=V 货 ×ρ 货 ×C 货 ×|T2-T1|; where W is the value of the work required to heat and cool the cargo, V 货 is the volume of the cargo, ρ 货 is the density of the cargo, C 货 is the specific heat capacity of the cargo, T2 is the target temperature of the cargo, and T1 is the initial temperature of the cargo;

[0194] Obtain the heating power of the tank storage and transportation equipment, recorded as P1;

[0195] Get the refrigeration power of the tank storage and transportation equipment, recorded as P2;

[0196] Calculate the total heating power of the cargo affected by the heating carrier and the environment. The total heating power of the cargo affected by the heating carrier and the environment is calculated by the following formula:

[0197] P 热 =P0+P1; where P 热 is the total heating power of the cargo affected by the heating carrier and the environment, P0 is the heat transfer power of the environment to the cargo, and P1 is the heating power of the tank storage and transportation equipment;

[0198] Calculate the total refrigeration power of the cargo affected by the refrigeration carrier and the environment. The total refrigeration power of the cargo affected by the refrigeration carrier and the environment is calculated using the following formula:

[0199] P 冷 =P2-P0; where P 冷 It is the total refrigeration power of the cargo affected by the refrigeration carrier and the environment, P0 is the heat transfer power of the environment to the cargo, and P2 is the refrigeration power of the tank storage and transportation equipment.

[0200] The step of obtaining the cargo temperature adjustment time according to the cargo temperature adjustment time acquisition strategy also includes:

[0201] If the target temperature of the cargo is greater than the initial temperature of the cargo, the cargo needs to be heated;

[0202] Calculate the cargo heating time and total interval time using the following formula:

[0203]

[0204] Where T 热 The heating time of the goods, T 热隔 is the total heating interval duration, is the total heating interval duration coefficient, W is the value of the work required to heat the cargo, P 热 is the total heating power of the cargo affected by the heating carrier and the environment, and P0 is the heat transfer power of the environment to the cargo;

[0205] If the target temperature of the cargo is lower than the initial temperature of the cargo, the cargo needs to be refrigerated;

[0206] Calculate the cargo refrigeration time and the total interval time. Calculate the cargo refrigeration time and the total interval time using the following formula:

[0207]

[0208] Where T 冷 is the refrigeration time of the goods, T 冷隔 is the total cooling interval duration, is the total refrigeration interval duration coefficient, W is the value of the work required to cool the cargo, P 冷 is the total refrigeration power of the cargo affected by the refrigeration carrier and the environment, and P0 is the heat transfer power of the environment to the cargo;

[0209] Get the sum of the cargo heating time and the total heating interval time or the sum of the cargo cooling time and the total cooling interval time, and record it as the cargo temperature adjustment time T 调 .

[0210] The dividing of the cargo temperature adjustment time into discontinuous cargo temperature adjustment time blocks specifically includes:

[0211] The cargo temperature adjustment time is divided into discontinuous cargo temperature adjustment time blocks according to the time when the cold and hot carriers start working and the time when they stop working, which are respectively recorded as the first adjustment block, the second adjustment block...the Ath adjustment block;

[0212] The moment each adjustment block starts is the moment when the cold and hot carriers start working;

[0213] The moment when each adjustment block ends is the moment when the cold and hot carriers finish working;

[0214] The cold and hot carriers perform heating and cooling work within each cargo temperature adjustment time block to adjust the temperature of the cargo;

[0215] The cold and hot carriers suspend heating and cooling work in the interval block outside each cargo temperature adjustment time block to restore the temperature of the cold and hot carriers;

[0216] Heating the goods for T 热 Divided into A blocks, the total heating interval is T 热隔 It is divided into A-1 blocks.

[0217]

[0218] The heating adjustment process is T 热1 , T 热隔1 , T 热2 , T 热隔2 ,…,T 热隔A-1 , T 热A ;

[0219] Refrigerate the goods for T 冷 Divided into B blocks, the total heating interval time is T 冷隔 It is divided into B-1 blocks;

[0220]

[0221] The cooling adjustment process is T 冷1 , T 冷隔1 , T 冷2 , T 冷隔2 ,…,T 冷隔B-1 , T 冷B ;

[0222] Set the heating carrier limit temperature, denoted as T 热限 ;

[0223] Set the heating carrier recovery temperature, denoted as T 热恢 ;

[0224] Set the cooling medium limit temperature, denoted as T 冷限 ;

[0225] Set the refrigeration medium recovery temperature, denoted as T 冷恢 ;

[0226] Get the real-time temperature of the goods, denoted as T 货 ;

[0227] If T1 <T2;

[0228] When the real-time temperature of the goods is T货 When the target temperature T2 of the cargo is not reached, the heating function is activated;

[0229] Get the temperature of the heating carrier, denoted as T 热载 ;

[0230] When T 热载 ≥T 热限 When the heating carrier stops working;

[0231] When T 热载 From T 热限 Reduce to T 热恢 When , the heating carrier starts to work;

[0232] When the real-time temperature of the goods is T 货 When the temperature reaches the target temperature T2 of the cargo for the first time, the heating carrier stops working and enters the temperature maintenance mode;

[0233] If T1>T2;

[0234] When the real-time temperature of the goods is T 货 When the target temperature T2 of the cargo is not reached, the refrigeration function is activated;

[0235] Get the temperature of the cooling medium, denoted as T 冷载 ;

[0236] When T 冷载 ≤T 冷限 When the refrigeration carrier stops working;

[0237] When T 冷载 From T 冷限 Rise to T 冷恢 When the refrigeration carrier starts to work;

[0238] This method of temperature control for tank storage and transportation equipment can better control the heating and cooling process and avoid the impact of extreme temperatures on goods by setting the limit temperature and recovery temperature of the heating carrier and the cooling carrier. Its advantages include: preventing the heating carrier and the cooling carrier from being too high or too low in temperature, protecting goods and equipment; ensuring that the system operates within a safe temperature range through dynamic monitoring and control; avoiding equipment from operating under extreme conditions, reducing wear and failure probability, and extending equipment service life;

[0239] When the real-time temperature of the goods is T 货 When the temperature reaches the target temperature T2 of the cargo for the first time, the refrigeration carrier stops working and enters the temperature maintenance mode.

[0240] When the cargo temperature reaches the cargo target temperature, the temperature maintenance mode is entered, which specifically includes:

[0241] Get the real-time temperature T of the goods 货、Ambient temperature T 环 , initial temperature of cargo T1, target temperature of cargo T2, heat transfer power of environment to cargo P0, heating power of tank storage and transportation equipment P1 and cooling power of tank storage and transportation equipment P2;

[0242] Set the upper and lower precision values ​​of the control, the upper precision value is recorded as X1, and the lower precision value is recorded as X2;

[0243] Get the cargo temperature adjustment duration and interval duration according to the cargo temperature adjustment duration acquisition strategy in the maintenance mode:

[0244] If T2>T 环 ;

[0245] Get the total heating interval duration coefficient in maintenance mode

[0246]

[0247] α is the setting coefficient P of the total interval length of heating in the maintenance mode 热 is the total heating power of the cargo affected by the heating carrier and the environment, and P0 is the heat transfer power of the environment to the cargo;

[0248] Set the standard temperature maintenance mode heating block unit time T 热维 ;

[0249] The interval block unit duration is

[0250] The standard temperature maintenance mode is to alternately heat the block units and space the block units;

[0251] When the real-time temperature of the goods is T 货 When the cargo target temperature reaches the upper limit of accuracy T2+X1, the heating carrier stops working and records the total heating maintenance time T 热维总 =∑T 热维i +∑T 热隔维i ;

[0252] Calculate the system's extra heat W1 = V 货 ×ρ 货 ×C 货 ×X1;

[0253] Calculate the extra heating power of the system in the temperature heating maintenance range

[0254] Adjust to get the new total heating interval time coefficient

[0255] In this way, we get the new unit interval duration T 热隔维 ';

[0256] When the real-time temperature of the goods is T 货 When the cargo target temperature accuracy lower limit T2-X2 is reached, the total heating maintenance time T is recorded. 热维总 =∑T 热维i +∑Y 热隔维i ;

[0257] Calculate the minimum heat of the system W2 = V 货 ×ρ 货 ×C 货 ×X2;

[0258] Calculate the heating power that the system lacks in the temperature heating maintenance range

[0259] Adjust to get the new total heating interval time coefficient

[0260] In this way, we get the new unit interval duration T 热隔维 ”;

[0261] If T2 <T 环 , then refrigeration maintenance is required;

[0262] Get the total cooling interval duration coefficient in maintenance mode

[0263]

[0264] β is the setting coefficient of the total heating interval duration in the maintenance mode, P 冷 is the total heating power of the cargo affected by the refrigeration carrier and the environment, and P0 is the heat transfer power of the environment to the cargo;

[0265] Set the standard temperature maintenance mode cooling block unit time T 冷维 ;

[0266] The interval block unit duration is

[0267] The standard temperature maintenance mode refrigeration block units and spacing block units are operated alternately;

[0268] When the real-time temperature of the goods is T 货 When the cargo target temperature accuracy lower limit T2-X2 is reached, the refrigeration carrier stops working and the total refrigeration maintenance time T is recorded. 冷维总 =∑T 冷维i +∑T 冷隔维i ;

[0269] Calculate the extra cooling work done by the system W2 = V 货 ×ρ 货 ×C 货 ×X2;

[0270] Calculate the extra cooling power of the system in the temperature cooling maintenance range

[0271] Adjust to get the new total cooling interval duration coefficient

[0272] In this way, we get the new unit interval duration T 冷隔维 ';

[0273] When the real-time temperature of the goods is T 货 When the cargo target temperature accuracy upper limit T2+X1 is reached, the total refrigeration maintenance time T is recorded. 冷维总 =∑T 冷维i +∑T 冷隔维i ;

[0274] Calculate the system's extra heat W1 = V 货 ×ρ 货 ×C 货 ×X1;

[0275] Calculate the cooling power required by the system in the temperature cooling maintenance range

[0276] Adjust to get the new total cooling interval duration coefficient

[0277] In this way, we get the new unit interval duration T 冷隔维 ”;

[0278] The temperature control method of a tank storage and transportation equipment can control the temperature adjustment process more flexibly by dividing the temperature adjustment time into multiple discontinuous blocks. The system performs cooling or heating in a predetermined block, which can prevent the temperature of the goods from fluctuating too much within a period of time. The system restores the temperature of the cold and hot carriers outside the predetermined block, dynamically adjusts and controls the temperature, and ensures that the temperature of the goods is within the set range. The advantage of this strategy is that it can be dynamically adjusted according to the real-time temperature and control accuracy to ensure that the temperature of the goods does not fluctuate too much; unnecessary heating and cooling are avoided, and efficient use of energy is achieved through precise control.

[0279] A temperature control method for tank storage and transportation equipment, when the temperature of the cargo reaches the target temperature, the system enters the temperature maintenance mode, and ensures the stability of the cargo temperature by setting the control accuracy; traditional temperature control methods often lack a temperature maintenance mechanism, and are prone to temperature fluctuations after reaching the target temperature, affecting the quality of the cargo; the temperature maintenance mode sets the control accuracy and fine-tunes the working cycle of the heating or refrigeration carrier to ensure that the cargo temperature remains stable near the target temperature; this method can effectively avoid the impact of temperature fluctuations on the cargo; in addition, the temperature maintenance mode can also reduce the working time of the heating or refrigeration carrier, reduce energy consumption and equipment wear, and improve the operation efficiency of the system.

[0280] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0281] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for controlling the temperature of a tank storage and transportation equipment, characterized in that: Specifically include: According to the heat transfer coefficient test strategy, the heat transfer coefficient of the tank storage and transportation equipment to the environment is obtained and recorded as the first coefficient, which is specifically: Get the volume of the test cargo, recorded as V a ; Get the density of the test cargo, denoted as ρ a ; Get the specific heat capacity of the test cargo, recorded as C a ; Place the test goods in a tank storage and transportation device for testing; Get the unit duration of the natural temperature rise and fall cycle, recorded as T a ; The unit time length of the natural temperature rise and fall cycle is divided into several small recording cycles, which are recorded as S1, S2...S R ; For each small recording period; Obtain the difference between the average ambient temperature and the average cargo temperature in the short recording period, which are recorded as ΔT1, ΔT2, ΔT3, ... ΔT R ; Calculate the average temperature difference ΔT between the cargo temperature and the ambient temperature during the natural temperature rise and fall cycle n ; Calculate the first coefficient using the following formula: Where K0 is the first coefficient, V a The volume of the test cargo, ρ a To test the density of the cargo, C a To test the specific heat capacity of the cargo, ΔT n is the average temperature difference between the cargo temperature and the ambient temperature during the natural heating and cooling cycle, T a The unit duration of the natural heating and cooling cycle; Determine whether the first coefficient is valid; Obtain the thermal insulation performance definition value of the tank storage and transportation equipment and record it as the second coefficient; Set deviation thresholds; like The first coefficient is deemed valid and is selected as the total heat transfer coefficient of the tank storage and transportation equipment to the environment; like The first coefficient is deemed invalid, and the second coefficient is selected as the total heat transfer coefficient of the tank storage and transportation equipment to the environment; The total heat transfer coefficient of the tank storage and transportation equipment to the environment is recorded as K; By testing the first coefficient and the second coefficient and judging according to the deviation threshold, the most accurate heat transfer coefficient is selected for subsequent temperature control. If the first coefficient is invalid, the second coefficient is used. Select the working mode according to the damage of the cargo temperature sensor, including: For each sensor, determine whether the sensor is damaged; If the sensor is not damaged, the system automatically obtains the required data, and then obtains the cargo temperature adjustment time according to the cargo temperature adjustment time acquisition strategy; If the sensor is damaged, select the emergency mode to manually input the required data to control the operation of the equipment, and then obtain the cargo temperature adjustment time according to the cargo temperature adjustment time acquisition strategy; The cargo temperature adjustment time is obtained according to the cargo temperature adjustment time acquisition strategy, including: Get the initial temperature of the cargo, recorded as T1; Get the target temperature of the cargo, recorded as T2; Get the ambient temperature, recorded as T H ; Calculate the average temperature difference ΔT between the environment and the cargo m ; ΔT m =[(T H -T1)+(T H -T2)]÷2; Get the volume of the cargo, denoted as V 货 ; Get the density of the cargo, denoted as ρ 货 ; Get the specific heat capacity of the cargo, denoted as C 货 ; Calculate the heat transfer power of the environment to the cargo using the following formula: P0=ΔT m ×K; P0 is the heat transfer power of the environment to the cargo, ΔT m is the average temperature difference between the environment and the cargo, K is the total heat transfer coefficient of the tank storage and transportation equipment to the environment; While adjusting the temperature of the cargo, detect and control the temperature of the hot and cold carriers; Divide the cargo temperature adjustment time into discrete cargo temperature adjustment time blocks; Adjust the temperature of cargo and cold and hot carriers within each cargo temperature adjustment time block; Outside of each cargo temperature adjustment time block, suspend temperature adjustment and restore the temperature of the cold and hot carriers; When the temperature of the cargo reaches the cargo target temperature, it enters the temperature maintenance mode.

2. A temperature control method for tank storage and transportation equipment according to claim 1, characterized in that: The step of obtaining the cargo temperature adjustment time according to the cargo temperature adjustment time acquisition strategy further includes: Calculate the work required to heat and cool the cargo using the following formula: W=V 货 ×ρ 货 ×C 货 ×|T2-T1|; where W is the value of the work required to heat and cool the cargo, V 货 is the volume of the cargo, ρ 货 is the density of the cargo, C 货 is the specific heat capacity of the cargo, T2 is the target temperature of the cargo, and T1 is the initial temperature of the cargo; Obtain the heating power of the tank storage and transportation equipment, recorded as P1; Get the refrigeration power of the tank storage and transportation equipment, recorded as P2; Calculate the total heating power of the cargo affected by the heating carrier and the environment. The total heating power of the cargo affected by the heating carrier and the environment is calculated by the following formula: P 热 =P0+P1; where P 热 is the total heating power of the cargo affected by the heating carrier and the environment, P0 is the heat transfer power of the environment to the cargo, and P1 is the heating power of the tank storage and transportation equipment; Calculate the total refrigeration power of the cargo affected by the refrigeration carrier and the environment. The total refrigeration power of the cargo affected by the refrigeration carrier and the environment is calculated using the following formula: P 冷 =P2-P0; where P 冷 It is the total refrigeration power of the cargo affected by the refrigeration carrier and the environment, P0 is the heat transfer power of the environment to the cargo, and P2 is the refrigeration power of the tank storage and transportation equipment.

3. A temperature control method for tank storage and transportation equipment according to claim 2, characterized in that: The step of obtaining the cargo temperature adjustment time according to the cargo temperature adjustment time acquisition strategy also includes: If the target temperature of the cargo is greater than the initial temperature of the cargo, the cargo needs to be heated; Calculate the cargo heating time and total interval time using the following formula: Where T 热 The heating time of the goods, T 热隔 is the total heating interval duration, is the total heating interval duration coefficient, W is the value of the work required to heat the cargo, P 热 is the total heating power of the cargo affected by the heating carrier and the environment, and P0 is the heat transfer power of the environment to the cargo; If the target temperature of the cargo is lower than the initial temperature of the cargo, the cargo needs to be refrigerated; Calculate the cargo refrigeration time and the total interval time. Calculate the cargo refrigeration time and the total interval time using the following formula: Where T 冷 is the refrigeration time of the goods, T 冷隔 is the total cooling interval duration, is the total refrigeration interval duration coefficient, W is the value of the work required to cool the cargo, P 冷 is the total refrigeration power of the cargo affected by the refrigeration carrier and the environment, and P0 is the heat transfer power of the environment to the cargo; Get the sum of the cargo heating time and the total heating interval time or the sum of the cargo cooling time and the total cooling interval time, and record it as the cargo temperature adjustment time T O .

4. A temperature control method for tank storage and transportation equipment according to claim 1, characterized in that: The dividing of the cargo temperature adjustment time into discontinuous cargo temperature adjustment time blocks specifically includes: The cargo temperature adjustment time is divided into discontinuous cargo temperature adjustment time blocks according to the time when the cold and hot carriers start working and the time when they stop working, which are respectively recorded as the first adjustment block, the second adjustment block...the Ath adjustment block; The moment each adjustment block starts is the moment when the cold and hot carriers start working; The moment when each adjustment block ends is the moment when the cold and hot carriers finish working; The cold and hot carriers perform heating and cooling work within each cargo temperature adjustment time block to adjust the temperature of the cargo; The cold and hot carriers suspend heating and cooling work in the interval block outside each cargo temperature adjustment time block to restore the temperature of the cold and hot carriers; Heating the goods for T 热 Divided into A blocks, the total heating interval is T 热隔 It is divided into A-1 blocks; The heating adjustment process is T 热1 , T 热隔1 , T 热2 , T 热隔2 ,…,T 热隔A-1 , T 热A ; Refrigerate the goods for T 冷 Divided into B blocks, the total heating interval time is T 冷隔 It is divided into B-1 blocks; The refrigeration adjustment process is T 冷1 , T 冷隔1 , T 冷2 , T 冷隔2 ,…,T 冷隔B-1 , T 冷B ; Set the heating carrier limit temperature, denoted as T 热限 ; Set the heating carrier recovery temperature, denoted as T 热恢 ; Set the cooling medium limit temperature, denoted as T 冷限 ; Set the refrigeration medium recovery temperature, denoted as T 冷恢 ; Get the real-time temperature of the goods, denoted as T 货 ; If T1 <T2; When the real-time temperature of the goods is T 货 When the target temperature T2 of the cargo is not reached, the heating function is activated; Get the temperature of the heating carrier, denoted as T 热载 ; When T 热载 ≥T 热限 When the heating carrier stops working; When T 热载 From T 热限 Reduce to T 热恢 When , the heating carrier starts to work; When the real-time temperature of the goods is T 货 When the temperature reaches the target temperature T2 of the cargo for the first time, the heating carrier stops working and enters the temperature maintenance mode; If T1>T2; When the real-time temperature of the goods is T 货 When the target temperature T2 of the cargo is not reached, the refrigeration function is activated; Get the temperature of the cooling medium, denoted as T 冷载 ; When T 冷载 ≤T 冷限 When the refrigeration carrier stops working; When T 冷载 From T 冷限 Rise to T 冷恢 When the refrigeration carrier starts to work; When the real-time temperature of the goods is T 货 When the temperature reaches the target temperature T2 of the cargo for the first time, the refrigeration carrier stops working and enters the temperature maintenance mode.

5. A method for controlling temperature of tank storage and transportation equipment according to claim 1, characterized in that: When the cargo temperature reaches the cargo target temperature, the temperature maintenance mode is entered, which specifically includes: Get the real-time temperature T of the goods 货 、Ambient temperature T H , initial temperature of cargo T1, target temperature of cargo T2, heat transfer power of environment to cargo P0, heating power of tank storage and transportation equipment P1 and cooling power of tank storage and transportation equipment P2; Set the upper and lower precision values ​​of the control, the upper precision value is recorded as X1, and the lower precision value is recorded as X2; Get the cargo temperature adjustment duration and interval duration according to the cargo temperature adjustment duration acquisition strategy in the maintenance mode: If T2>T H ; Get the total heating interval duration coefficient in maintenance mode α is the setting coefficient of the total heating interval duration in the maintenance mode, P 热 is the total heating power of the cargo affected by the heating carrier and the environment, and P0 is the heat transfer power of the environment to the cargo; Set the standard temperature maintenance mode heating block unit time T 热维 ; The interval block unit duration is The standard temperature maintenance mode is to alternately heat the block units and space the block units; When the real-time temperature of the goods is T 货 When the cargo target temperature reaches the upper limit of accuracy T2+X1, the heating carrier stops working and records the total heating maintenance time T 热维总 =∑T 热维i +∑T 热隔维i ; Calculate the system's extra heat W1 = V 货 ×ρ 货 ×C 货 ×X1; Calculate the extra heating power of the system in the temperature heating maintenance range Adjust to get the new total heating interval time coefficient In this way, we get the new unit interval duration T 热隔维 '; When the real-time temperature of the goods is T 货 When the cargo target temperature accuracy lower limit T2-X2 is reached, the total heating maintenance time T is recorded. 热维总 =∑T 热维i +∑T 热隔维i ; Calculate the minimum heat of the system W2 = V 货 ×ρ 货 ×C 货 ×X2; Calculate the heating power that the system lacks in the temperature heating maintenance range Adjust to get the new total heating interval time coefficient In this way, we get the new unit interval duration T 热隔维 ”; If T2 <T H , then refrigeration maintenance is required; Get the total cooling interval duration coefficient in maintenance mode β is the setting coefficient of the total cooling interval duration in the maintenance mode, P 冷 is the total heating power of the cargo affected by the refrigeration carrier and the environment, and P0 is the heat transfer power of the environment to the cargo; Set the standard temperature maintenance mode cooling block unit time T 冷维 ; The interval block unit duration is The standard temperature maintenance mode refrigeration block units and spacing block units are operated alternately; When the real-time temperature of the goods is T 货 When the cargo target temperature accuracy lower limit T2-X2 is reached, the refrigeration carrier stops working and the total refrigeration maintenance time T is recorded. 冷维总 =∑T 冷维i +∑T 冷隔维i ; Calculate the heat missing from the system W2 = V 货 ×ρ 货 ×C 货 ×X2; Calculate the extra cooling power of the system in the temperature cooling maintenance range Adjust to get the new total cooling interval duration coefficient In this way, we get the new unit interval duration T 冷隔维 '; When the real-time temperature of the goods is T 货 When the cargo target temperature accuracy upper limit T2+X1 is reached, the total refrigeration maintenance time T is recorded. 冷维总 =∑T 冷维i +∑T 冷隔维i ; Calculate the system's extra heat W1 = V 货 ×ρ 货 ×C 货 ×X1; Calculate the cooling power required by the system in the temperature cooling maintenance range Adjust to get the new total cooling interval duration coefficient In this way, we get the new unit interval duration T 冷隔维 ”.

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