CN110920645A - System and method for dehumidifying train air conditioning unit, computer device and storage medium - Google Patents

System and method for dehumidifying train air conditioning unit, computer device and storage medium Download PDF

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Publication number
CN110920645A
CN110920645A CN201911059262.4A CN201911059262A CN110920645A CN 110920645 A CN110920645 A CN 110920645A CN 201911059262 A CN201911059262 A CN 201911059262A CN 110920645 A CN110920645 A CN 110920645A
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return air
air
temperature
heating
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CN110920645B (en
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钱营锋
蒋滔
杨禹岳
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Zhejiang Shield Rail Traffic Equipment Co Ltd
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Zhejiang Shield Rail Traffic Equipment Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61D—BODY DETAILS OR KINDS OF RAILWAY VEHICLES
    • B61D27/00—Heating, cooling, ventilating, or air-conditioning
    • B61D27/0018—Air-conditioning means, i.e. combining at least two of the following ways of treating or supplying air, namely heating, cooling or ventilating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61C—LOCOMOTIVES; MOTOR RAILCARS
    • B61C17/00—Arrangement or disposition of parts; Details or accessories not otherwise provided for; Use of control gear and control systems

Abstract

The invention discloses a system, a method, computer equipment and a storage medium for dehumidifying a train air conditioning unit, wherein a return air temperature and humidity sensor of the train air conditioning unit is used for acquiring return air temperature and return air relative humidity, a fresh air temperature and humidity sensor is used for acquiring fresh air temperature and fresh air relative humidity, an air supply temperature and humidity sensor is used for acquiring air supply temperature and air supply relative humidity, a main control board is used for acquiring target moisture content according to target relative humidity, acquiring target enthalpy according to target temperature and target moisture content, acquiring refrigerating capacity according to fresh air quantity, return air quantity, target refrigerating capacity and compartment cold quantity, acquiring heating capacity according to fresh air quantity, return air quantity and target enthalpy value, the main control board controls a first circulating device to refrigerate according to the refrigerating capacity, controls a second circulating device to heat according to the heating capacity, and solves the problem that the train air conditioning unit cannot effectively maintain the temperature and the humidity in the compartment in a, the comfort level of passenger's ride and the stability of interior electrical equipment work of carriage have been improved.

Description

System and method for dehumidifying train air conditioning unit, computer device and storage medium
Technical Field
The application relates to the technical field of air conditioners, in particular to a system, a method, computer equipment and a storage medium for dehumidification of a train air conditioning unit.
Background
Under the condition that humidity in air is high and reaches more than 90% when plum rain is produced in southern areas of China, but temperature is not high and is below 26 ℃, due to the fact that outdoor air is humid, relative humidity of air in a train is high, however, an air conditioning unit of the train is limited by weight, size and structure, an evaporator and a condenser cannot be simultaneously arranged indoors like a conventional dehumidification unit, dehumidification is carried out in a mode of cooling the evaporator and heating the condenser, meanwhile, the dehumidification is limited by the capacity of a power supply of the train, a compressor and an electric heater of the train unit cannot be simultaneously started like the conventional air conditioning unit, and dehumidification is carried out in a mode of cooling the compressor and heating the electric heater.
In the related technology, the dehumidification method of the train air conditioning unit indirectly dehumidifies through refrigeration, and the method has a great defect in use in plum rain hours, because the ambient temperature is not high and the refrigeration load is small, the temperature in the carriage can be quickly reduced to the shutdown temperature point of the air conditioning unit after the train air conditioning unit is started, so that the train air conditioning unit is forced to stop refrigeration, high-humidity fresh air can be continuously introduced from the outside to ensure the ventilation volume of passengers, the humidity in the carriage can be quickly raised, and in such an environment, a human body has strong stuffiness, and electrical equipment in a high-humidity environment is easy to leak electricity and damage. Since the related art cannot effectively maintain the temperature and humidity in the vehicle compartment in a relatively reasonable and constant state, the comfort of passengers and the stability of the operation of electrical equipment in the vehicle compartment are affected.
Aiming at the problems that in the related art, the train unit cannot effectively maintain the temperature and the humidity in the carriage in a relatively reasonable and constant state, so that the riding comfort of passengers and the working stability of electrical equipment in the carriage are influenced, an effective solution is not provided at present.
Disclosure of Invention
The invention provides a dehumidification system, a dehumidification method, a computer device and a storage medium of a train air conditioning unit, which aim to solve the problems that in the related art, the temperature and the humidity in a carriage cannot be effectively maintained in a relatively reasonable and constant state by the train air conditioning unit, so that the riding comfort of passengers and the working stability of electrical equipment in the carriage are affected.
According to one aspect of the invention, a dehumidification system of an air conditioning unit of a train is provided, and the system comprises a return air temperature and humidity sensor, a fresh air temperature and humidity sensor, an air supply temperature and humidity sensor, a main control board, a first circulating device and a second circulating device:
the return air temperature and humidity sensor is used for acquiring the return air temperature TReturn airAnd relative humidity psi of return airReturn airThe fresh air temperature and humidity sensor is used for acquiring fresh air temperature TFresh airRelative humidity psi of fresh airFresh airThe air supply temperature and humidity sensor is used for acquiring air supply temperature TAir supplyAnd relative humidity psi of the air supplyAir supply；
The main control board is used for controlling the main control board according to the target relative humidity psiTargetObtaining the target moisture content dTargetAccording to the target temperature TTargetAnd dTargetObtaining a target enthalpy value iTargetFrom the fresh air quantity QFresh airReturn air quantity QReturn airThe target enthalpy value iTargetObtaining the refrigerating capacity by the cold capacity of the carriage, and obtaining the fresh air quantity QFresh airThe return air volume QReturn airAnd the target enthalpy value iTargetObtaining the heating quantity;
the main control board controls the first circulating device to refrigerate according to the refrigerating capacity, and controls the second circulating device to heat according to the heating capacity.
In one of the embodiments, the first and second electrodes are,
at the return air moisture content dReturn airIs greater than dTargetUnder the condition of the sum of the moisture content difference value △ d, the main control board controls the first circulating device to refrigerate according to the refrigerating capacity;
at d inReturn airIs greater than or equal to dTargetA difference from said △ d, and said dReturn airIs less than or equal to dTargetAnd △ d, the main control board will use dReturn airAnd d isTargetCarrying out Proportional Integral Derivative (PID) calculation to obtain PID refrigerating capacity, and controlling the first circulating device to refrigerate according to the PID refrigerating capacity by the main control board;
at d inReturn airIs less than dTargetAnd △ d, the main control board controls the first circulation device to stop cooling.
In one of the embodiments, the first and second electrodes are,
at return air temperature TReturn airLess than said TTargetUnder the condition of the difference with the temperature difference value △ T, the main control board controls the second circulating device to heat according to the heating quantity;
at the TReturn airLess than or equal to TTargetAnd the sum of said △ T, and TReturn airGreater than or equal to TTargetIn the case of the difference with the △ T, the main control board will use the TReturn airAnd said TTargetCarrying out PID calculation to obtain a PID heating quantity, and controlling the second circulating device to heat according to the PID heating quantity by the main control board;
at the TReturn airGreater than TTargetAnd △ T, the main control board controls the second circulation device to stop heating.
According to another aspect of the invention, a method for dehumidifying an air conditioning unit of a train is provided, which comprises the following steps:
according to the target relative humidity psi in the trainTargetObtaining the target moisture content dTargetAccording to the target temperature TTargetAnd d isTargetObtaining a target enthalpy value iTarget；
Controlling a first circulating device of an air conditioning unit of the train to refrigerate according to refrigerating capacity, wherein the refrigerating capacity is the fresh air quantity QFresh airReturn air quantity QReturn airThe target enthalpy value iTargetObtaining the cold quantity of the carriage;
controlling a second circulating device of the air conditioning unit to heat according to the heating capacity, wherein the heating capacity is obtained by the fresh air volume QFresh airThe return air volume QReturn airAnd the target enthalpy value iTargetAnd (6) obtaining.
In one embodiment, the controlling the first circulation device of the train air conditioning unit to perform cooling according to the cooling capacity includes one of the following steps:
at the return air moisture content dReturn airIs greater than dTargetAnd under the condition of the sum of the moisture content difference value △ d, controlling the first circulating device to refrigerate according to the refrigerating capacity;
at d inReturn airIs greater than or equal to dTargetA difference from said △ d, and said dReturn airIs less than or equal to dTargetAnd △ d, adding d toReturn airAnd d isTargetCarrying out Proportional Integral Derivative (PID) calculation to obtain PID refrigerating capacity, and controlling the first circulating device to refrigerate according to the PID refrigerating capacity;
at d inReturn airIs less than dTargetAnd △ d, controlling the first circulation device to stop cooling.
In one embodiment, the controlling the second circulation device of the train air conditioning unit to perform heating according to the heating quantity includes one of the following steps:
at return air temperature TReturn airLess than said TTargetAnd the temperature difference value △ T, controlling the second circulating device to heat according to the heating quantity;
at the TReturn airLess than or equal to TTargetAnd the sum of said △ T, and TReturn airGreater than or equal to TTargetIn the case of the difference from the △ T, the T is setReturn airAnd said TTargetCarrying out PID calculation to obtain PID heating quantity, and controlling the second circulating device to carry out heating according to the PID heating quantity;
at the TReturn airGreater than TTargetAnd △ T, the first circulation device is controlled to stop heating.
In one embodiment, the cooling and heating processes further comprise:
condensing pressure P in the first circulation deviceRefrigeration systemIs greater than or equal to the upper limit value P of the refrigeration pressure of the first circulating deviceUpper limit ofIn the case of (3), controlling the first circulating device to perform condensation;
the evaporation pressure P in the second circulation deviceHeating apparatusLower limit value P of heating pressure of the second circulation deviceLower limit ofIn the case of (3), controlling the second circulating device to perform condensation;
at the PRefrigeration systemLess than or equal to PUpper limit ofAnd △ PUpper limit ofThe difference of PHeating apparatusGreater than or equal to PLower limit ofAnd △ PLower limit ofAnd controlling the first circulation device and the second circulation device to stop condensing under the condition of the sum of the target time and the target time, wherein the △ PUpper limit ofSaid △ P being the set point of the return difference of the pressure in the outdoor coil of said first circulating meansLower limit ofThe set value of the return difference of the pressure in the outdoor coil pipe of the second circulating device is obtained.
In one embodiment, the controlling the second circulation device of the train air conditioning unit to perform heating according to the heating amount further includes:
carrying out PID calculation on the exhaust temperature of the compressor and the target exhaust temperature of the compressor to obtain a PID calculated value, and controlling the opening of a liquid spray electronic expansion valve arranged in a liquid spray cooling pipeline according to the PID calculated value, wherein the liquid spray cooling pipeline sprays refrigerant into an air suction port of the compressor, and the refrigerant circulates in the compressor to cool the compressor.
According to another aspect of the present invention, there is provided a computer device comprising a memory storing a computer program and a processor implementing any of the methods described above when the processor executes the computer program.
According to another aspect of the invention, there is provided a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements any of the methods described above.
According to the invention, the return air temperature and humidity sensor of the train air conditioning unit is used for acquiring the return air temperature TReturn airAnd relative humidity psi of return airReturn airThe fresh air temperature and humidity sensor is used for acquiring fresh air temperature TFresh airRelative humidity psi of fresh airFresh airThe air supply temperature and humidity sensor is used for acquiring air supply temperature TAir supplyAnd relative humidity psi of the air supplyAir supplyThe main control board is used for controlling the temperature T according to the target temperatureTargetAnd target relative humidity psiTargetObtaining the target moisture content dTargetAnd target enthalpy value iTargetFrom the fresh air quantity QFresh airReturn air quantity QReturn airTarget enthalpy value iTargetThe refrigerating capacity is obtained by the cold energy of the carriage and is QFresh air、QReturn airAnd iTargetThe heating quantity is obtained, the main control board controls the first circulating device to refrigerate according to the refrigerating quantity, and controls the second circulating device to heat according to the heating quantity, so that the problem that the temperature and the humidity in the carriage cannot be effectively maintained in a relatively constant state by the train unit is solved, and the comfort level of passengers and the working stability of electrical equipment in the carriage are improved.
Drawings
FIG. 1 is a schematic diagram of a train air conditioning unit dehumidification system cycle apparatus according to an embodiment of the present invention;
FIG. 2 is a block diagram of a dehumidification system of an air conditioning unit of a train according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method of dehumidifying a train air conditioning unit according to an embodiment of the present invention;
fig. 4 is a flowchart of a method in which a main control board controls a first cycle device to perform cooling according to an embodiment of the present invention;
fig. 5 is a flowchart of a method in which a main control board controls a second circulation device to perform heat according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Fig. 1 is a schematic diagram of a circulation device of a train air conditioning unit dehumidification system according to an embodiment of the present invention, and as shown in fig. 1, the system includes a first circulation device and a second circulation device, wherein a compressor 101 is provided with a four-way valve 102, a compressor exhaust temperature sensor 113, an electronic expansion valve 114 and a liquid injection electronic expansion valve 115, an outdoor coil 103 is provided with a fresh air temperature and humidity sensor 111 and an outdoor coil pressure sensor 112, a train air conditioning unit air supply outlet 108 of an indoor air blower 105 is provided with an air supply temperature and humidity sensor 110, a train air conditioning unit air return outlet 107 is provided with an air return temperature and humidity sensor 109, the circulation device further includes an indoor coil 104 and an outdoor condensing fan 106, and when the first circulation device operates, the compressor 101 sucks in a lower-pressure vapor from the indoor coil 104 and compresses the vapor into a higher-pressure vapor, the compressor 101 sends the steam with increased pressure to the outdoor coil 103 through the four-way valve 102, the outdoor coil 103 condenses the steam into liquid with higher pressure, the liquid is throttled by the electronic expansion valve 114 and then sent to the indoor coil 104, the indoor coil 104 evaporates the liquid by absorbing heat to generate steam, and the generated steam is changed into steam with lower pressure again and sent to the compressor 101, thereby completing the cycle process. When the second circulation device is operated, the compressor 101 sucks the low-pressure steam from the outdoor coil 103 and compresses the steam into high-pressure steam, the compressor 101 sends the steam with increased pressure to the indoor coil 104 through the four-way valve 102, the indoor coil 104 condenses the steam into high-pressure liquid, the liquid is throttled by the electronic expansion valve 114 and then sent to the outdoor coil 103, the outdoor coil 103 evaporates the liquid through heat absorption to generate steam, the generated steam is changed into low-pressure steam again and sent to the compressor 101, and therefore the circulation process is completed.
In an embodiment, a dehumidification system for a train air conditioning unit is provided, and fig. 2 is a block diagram of a dehumidification system for a train air conditioning unit according to an embodiment of the present invention, and as shown in fig. 2, the dehumidification system includes a return air temperature and humidity sensor 109, an air supply temperature and humidity sensor 110, a fresh air temperature and humidity sensor 111, a main control board 202, a first circulation device 204, and a second circulation device 206:
the return air temperature and humidity sensor 109 is used for acquiring the return air temperature TReturn airAnd relative humidity psi of return airReturn airThe air supply temperature and humidity sensor 110 is used for acquiring the air supply temperature TAir supplyAnd relative humidity psi of the air supplyAir supplyThe fresh air temperature and humidity sensor 111 is used for acquiring fresh air temperature TFresh airRelative humidity psi of fresh airFresh airWherein, this system obtains environmental parameter through above-mentioned 3 sensors, and this 3 sensor includes: the return air temperature and humidity sensor 109, the supply air temperature and humidity sensor 110 and the fresh air temperature and humidity sensor 111 share the environmental parameters measured by 3 sensors for calculating the refrigerating capacity and the heating capacity, and in addition, the number of sensors on the system can also be 6, three sensors are arranged in the first circulating device 204, the temperature and humidity parameters of the first circulating device 204 are measured, three sensors are arranged in the second circulating device 206 to measure the temperature and humidity parameters of the second circulating device 206, return air is air which flows back to the return air inlet 107 of the train air conditioning unit from the carriage, fresh air is air which enters the carriage from the environment outside the carriage, air supply is processed by a dehumidification system of the train air conditioning unit, the relative humidity of the air supplied to the vehicle compartment by the indoor blower 105 is a percentage of the vapor pressure of the air to the saturated vapor pressure at the same temperature, and is measured by a temperature/humidity sensor.
The main control board 202 is used for controlling the relative humidity psi according to the target relative humidity psiTargetObtaining the target moisture content dTargetAccording to the target temperature TTargetAnd dTargetObtaining a target enthalpy value iTargetFrom the fresh air quantity QFresh airReturn air quantity QReturn airThe target enthalpy value iTargetThe refrigerating capacity is obtained by the cold capacity of the carriage, and the fresh air quantity Q is obtainedFresh airReturn air quantity QReturn airAnd target enthalpy value iTargetObtaining the heating capacity, wherein QFresh airCan be set according to the passenger capacity in the train, and increases Q under the condition of larger passenger capacityFresh airTo ensure the sufficient circulation of air in the carriageIn the case of a small passenger load, Q is decreasedFresh airTo save energy and return air quantity QReturn airThe system is preset according to the parameters and the performance of the dehumidification system of the train air conditioning unit, and can be modified in the use process of the dehumidification system of the train air conditioning unit so as to adapt to different actual conditions. The main control board 202 may be according to psiReturn airObtaining the moisture content d of return air by the saturated vapor pressure Psb and the atmospheric pressure PReturn airAccording to the TReturn airAnd dReturn airObtaining the return air enthalpy value iReturn airAccording to psiFresh airPsb and P to obtain the fresh air moisture content dFresh airAccording to TFresh airAnd dFresh airObtaining fresh air enthalpy value iFresh airAccording to psiAir supplyPsb and P to obtain the moisture content d of the blast airAir supplyAccording to TAir supplyAnd dAir supplyObtaining an enthalpy value i of the air supplyAir supplyThe moisture content refers to the mass (in grams) of water vapor mixed in dry air per kilogram of mass, and can be obtained from relative humidities ψ, Psb and P, for example, d ═ 6.22 · Psb/(P- ψ Psb), enthalpy value is the total heat per air, and can be obtained from temperature T and moisture content d, for example, the calculation formula of enthalpy value i may be i ═ 1.01T + (2500+1.84T) d, saturated vapor pressure is the water vapor pressure at which the gas phase and the liquid phase of water reach equilibrium, that is, saturation, the pressure value is related to the ambient temperature, and can be obtained by looking up a saturated vapor pressure table, the magnitude of atmospheric pressure is related to the altitude and the temperature, and the atmospheric pressure is obtained by a barometer, for example, the atmospheric pressure is obtained by a mercury barometer and an empty box barometer. The cooling capacity or the heating capacity Q can be obtained by the following equation 1:
Q＝Qair quantityρ × i/3600 formula 1
Q in formula 1Air quantityRho is air density and is related to pressure and temperature and can be obtained by inquiring an air density meter, and specifically, fresh air and return air are mixed and are sent into a carriage after being processed by a train unit, so that the total air quantity to be processed by the train air conditioning unit is QFresh airAnd QReturn airThe demand of the refrigerating capacity of the train air conditioning unit consists of two parts, wherein the first part is QFresh airAnd QReturn airThe second part is the cooling capacity generated in the carriage, therefore, the cooling capacity QRefrigerating capacityObtained from the following equation 2:
Qrefrigerating capacity＝[(QFresh air quantity+QReturn air quantity)*ρ/3600]*[iReturn air*QReturn air quantity/(QFresh air quantity+QReturn air quantity)+iFresh air*QFresh air quantity/(QFresh air quantity+QReturn air quantity)-iTarget+iReturn air-iAir supply]Equation 2
On the other hand, after the train air conditioning unit is cooled and dehumidified by the first circulating device, under the condition that the return air enthalpy is lower than the target enthalpy, the second circulating device 206 is required to increase the enthalpy in the carriage by heating so as to ensure that the first circulating device can continue to dehumidify and the heating quantity Q isHeating capacityObtained from the following equation 3:
Qheating capacity＝[(QFresh air quantity+QReturn air quantity)*ρ/3600]*(iTarget-iReturn air) Equation 3
The main control board 202 controls the first circulation device 204 to perform cooling according to the cooling capacity, and the main control board 202 controls the second circulation device 206 to perform heating according to the heating capacity.
Through above-mentioned train air conditioning unit dehumidification system, first circulating device 204 and second circulating device 206 move simultaneously, first circulating device 204 refrigerates according to the refrigerating capacity, second circulating device 206 heats according to the heating capacity, therefore, when train air conditioning unit's first circulating device 204 dehumidifies through refrigerating, second circulating device 206 heats and can avoid the interior temperature of carriage to reduce to the shutdown temperature point of first circulating device 204, thereby guarantee under the circumstances of air-out constancy of temperature, train air conditioning unit dehumidification system continuously dehumidifies, the problem that train unit can't maintain interior temperature and humidity at a relatively constant state effectively has been solved, passenger's comfort level and the interior electrical equipment of carriage work's stability have been improved.
In one embodiment, the main control board 202 also operates when the first cycle device 204 is operatingThe method for controlling the first cycle device 204 to perform cooling includes: at dReturn airGreater than dTargetAnd the sum of the difference value △ d, the main control board 202 controls the first circulating device 204 to refrigerate according to the refrigerating capacityReturn airIs greater than or equal to dTargetA difference of △ d, and dReturn airIs less than or equal to dTargetAnd △ d, the main control board 202 will dReturn airAnd dTargetproportional-Integral-derivative (PID) calculation is carried out to obtain PID refrigerating capacity, and the main control board 202 controls the first circulating device 204 to refrigerate according to the PID refrigerating capacity; at dReturn airIs less than dTargetThe difference between the current time and the time is △ d, the main control board 202 controls the first circulation device 204 to stop cooling, wherein △ d can be preset according to the performance and parameters of different train air conditioning units to ensure that the main control board 202 can effectively control the operation of the first circulation device 204, and the main control board 202 controls dTarget、dReturn air△ d, calculating the difference and comparing the difference, controlling the operation of the first circulation device 204 according to the comparison result, i.e. the main control board 202 adopts the way of controlling in different zones at dReturn airDeviation dTargetIn the larger case, the cooling capacity is used to control the operation of the first circulation device 204, at dReturn airApproach dTargetUnder the condition of (3), the PID algorithm is adopted to control the operation of the first circulating device 204 by heating, so that the first circulating device 204 can stably and effectively refrigerate.
In one embodiment, when the second circulation device 206 operates, the main control board 202 is further configured to control a heating manner of the second circulation device 206: at return air temperature TReturn airLess than TTargetThe main control board 202 controls the second circulation device 206 to heat according to the heating amount when the temperature difference is △ TReturn airLess than or equal to TTargetAnd △ T, and TReturn airGreater than or equal to TTargetIn the case of difference from △ T, the main control board 202 will TReturn airAnd TTargetPerforming PID calculation to obtain PID heating amount, and the main control board 202 controls the second cycleThe ring device 206 performs heating according to the PID heating amount; at TReturn airGreater than TTargetAnd △ T, the main control board 202 controls the second circulation device 206 to stop heating, wherein △ T can be preset according to the performance and parameters of different train air conditioning units to ensure that the main control board 202 can effectively control the operation of the second circulation device 206, and the main control board 202 controls TTarget、TReturn air△ T, calculating difference and comparing the difference, and controlling the operation of the second circulation device 206 according to the comparison result, i.e. the main control board 202 adopts the way of controlling in different zones at TReturn airDeviation TTargetIn the larger case, the heating capacity is used to control the operation of the second circulation device 206, at TReturn airApproach to TTargetUnder the condition of (2), the operation of the second circulation device 206 is controlled by heating through the PID algorithm, so that the second circulation device 206 is ensured to stably and effectively heat.
In one embodiment, fig. 3 is a flowchart of a method for dehumidifying an air conditioning unit of a train according to an embodiment of the present invention, and as shown in fig. 3, the method includes the following steps:
step S302, according to the target relative humidity psi in the trainTargetObtaining the target moisture content dTargetAccording to the target temperature TTargetAnd d isTargetObtaining a target enthalpy value iTarget；
Step S304, controlling the first circulating device 204 of the air conditioning unit of the train to refrigerate according to the refrigerating capacity, wherein the refrigerating capacity is controlled by the fresh air quantity QFresh airReturn air quantity QReturn airThe target enthalpy value iTargetObtaining the cold quantity of the carriage;
step S306, controlling the second circulating device 206 of the air conditioning unit to heat according to the heating capacity, wherein the heating capacity is the fresh air volume QFresh airThe return air volume QReturn airAnd the target enthalpy value iTargetAnd (6) obtaining.
Through the steps, when the first circulating device 204 of the train air conditioning unit dehumidifies through refrigeration, the second circulating device 206 heats to avoid the temperature in the carriage from being reduced to the shutdown temperature point of the first circulating device 204, so that the dehumidifying system of the train air conditioning unit continuously dehumidifies under the condition of constant air outlet temperature, the problem that the temperature and the humidity in the carriage cannot be effectively maintained in a relatively constant state by the train air conditioning unit is solved, and the comfort level of passengers and the working stability of electrical equipment in the carriage are improved.
In an embodiment, a method for refrigerating a first circulation device 204 of an air conditioning unit of a train according to a refrigerating capacity is provided, and fig. 4 is a flowchart of a method for controlling the first circulation device to refrigerate by a main control board according to an embodiment of the present invention, as shown in fig. 4, the method includes the following steps:
step S402, at dReturn airGreater than dTargetAnd △ d, the first circulation device 204 is controlled to perform cooling according to the cooling capacity or,
at dReturn airIs greater than or equal to dTargetA difference of △ d, and dReturn airIs less than or equal to dTargetIn the case of the sum of △ d, d is addedReturn airAnd dTargetPID calculation is carried out to obtain PID refrigerating capacity, the first circulating device 204 is controlled to carry out refrigeration according to the PID refrigerating capacity,
at dReturn airIs less than dTargetAnd △ d, the first cycle device 204 is controlled to stop cooling.
Through the above step S402, the main control board 202 pairs dTarget、dReturn air△ d, calculating the difference and comparing the difference, controlling the operation of the first circulation device 204 according to the comparison result, i.e. the main control board 202 adopts the way of controlling in different zones at dReturn airDeviation dTargetIn the larger case, the cooling capacity is used to control the operation of the first circulation device 204, at dReturn airApproach dTargetUnder the condition of (3), the PID algorithm is adopted to control the operation of the first circulating device 204 by heating, so that the first circulating device 204 can stably and effectively refrigerate.
In one embodiment, a method for heating the second circulation device 206 of the train air conditioning unit according to the heating amount is provided, and fig. 5 is a flowchart of a method for controlling the second circulation device to heat by a main control board according to an embodiment of the present invention, as shown in fig. 5, the method includes the following steps:
step S502, at TReturn airLess than TTargetAnd △ T, the second circulation device 206 is controlled to perform heating according to the heating amount or,
at TReturn airLess than or equal to TTargetAnd △ T, and TReturn airGreater than or equal to TTargetIn the case of the difference from △ T, T is setReturn airAnd TTargetPerforming PID calculation to obtain PID heating amount, controlling the second circulation device 206 to perform heating according to the PID heating amount or,
at TReturn airGreater than TTargetAnd △ T, the second circulation device 206 is controlled to stop heating.
Through the above step S502, the main control board 202 pairs TTarget、TReturn air△ T, calculating difference and comparing the difference, and controlling the operation of the second circulation device 206 according to the comparison result, i.e. the main control board 202 adopts the way of controlling in different zones at TReturn airDeviation TTargetWhen larger, the heating capacity is used to control the operation of the second circulation device 206, at TReturn airApproach to TTargetIn the meantime, the operation of the second circulation device 206 is controlled by the heating amount using the PID algorithm, which ensures that the second circulation device 206 stably and effectively heats.
In one embodiment, the main control board 202 controls the first circulation device 204 to perform cooling, and the controlling the second circulation device 206 to perform heating further includes: the condensing pressure P in the first circulating device 204Refrigeration systemIs greater than or equal to the upper limit value P of the refrigeration pressure of the first circulation device 204Upper limit ofUnder the condition of (3), controlling the first circulating device 204 to carry out condensation, and increasing the condensation efficiency of the first circulating device 204; the evaporation pressure P in the second circulation device 206Heating apparatusLower than or equal to the heating pressure lower limit value P of the second circulation device 206Lower limit ofIn the case of (2), the second circulation device 206 is controlled to perform condensation, so that the evaporation efficiency of the second circulation device 206 is increased; at PRefrigeration systemLess than or equal to PUpper limit ofAnd △ PUpper limit ofDifference of difference, PHeating apparatusGreater than or equal to PLower limit ofAnd △ PLower limit ofAnd controlling the first circulation device 204 and the second circulation device 206 to stop condensing for the target time, and reducing the condensing efficiency of the first circulation device 204 and the evaporating efficiency of the second circulation device 206, wherein △ P isUpper limit of△ P as a set point for the return difference in pressure in the outdoor coil 103 of the first circulation device 204Lower limit ofIs the set point of the return difference of the pressure in the outdoor coil 103 of the second circulation device 206, PUpper limit ofIs the upper pressure limit set point, P, in the outdoor coil 103 of the first circulating means 204Lower limit ofIs the lower pressure limit set point, △ P, in the outdoor coil 103 of the second circulation device 206Upper limit of、△PLower limit of、PUpper limit ofAnd PLower limit ofCan be preset according to the performance and parameters of the train air conditioning unit, and the condensing pressure PRefrigeration systemAnd the evaporation pressure PHeating apparatusWhich may be detected by an outdoor coil pressure sensor 112 disposed on the outdoor coil 103, the target time may be 3 minutes or some other time value, for example, at PRefrigeration system≤(PUpper limit of-△PUpper limit of) And P isHeating apparatus≥(PLower limit of+△PLower limit of) After 3 minutes, the outdoor condensing fan 106 stops working, and the first circulation device 204 and the second circulation device 206 stop running, so that the condensing efficiency of the first circulation device 204 and the evaporating efficiency of the second circulation device 206 are reduced. The main control board 202 obtains P according to the detection of the outdoor coil pressure sensor 112Refrigeration systemAnd PHeating apparatusThe start and stop of the outdoor condensing fan 106 are controlled, so that the running states of the first circulating device 204 and the second circulating device 206 are controlled, and the stable running of the refrigeration of the train air conditioning unit can be ensured.
In one embodiment, the heating by the second circulation device 206 according to the heating amount further includes: PID calculation is carried out on the exhaust temperature of the compressor 101 and the target exhaust temperature of the compressor 101 to obtain a PID calculated value, and the opening value of a liquid spray electronic expansion valve 115 arranged in a liquid spray cooling pipeline is controlled according to the PID calculated value, wherein the liquid spray cooling pipeline sprays refrigerant into an air suction port of the compressor 101, the purpose of cooling the compressor 101 is achieved through circulation of the refrigerant in the compressor 101, the refrigerant sprayed into the air suction port of the compressor 101 is quantitative, the quantitative value is related to the exhaust temperature of the compressor 101, the exhaust temperature of the compressor 101 is measured by a compressor exhaust temperature sensor 113 arranged at an exhaust port of the compressor, and the target exhaust temperature of the compressor can be preset according to the parameters and the performance of the train air conditioning. Since the ambient temperature of about 26 ℃ is relatively high for the second circulation device 206, the main control board 202 controls the liquid spray cooling pipeline by controlling the opening of the liquid spray electronic expansion valve 115, and the liquid spray cooling pipeline can reduce the operating temperature of the compressor 101 through liquid spray to ensure the stable operation of the compressor 101, thereby ensuring that the train air conditioning unit stably and effectively maintains the temperature and humidity in the carriage in a relatively reasonable and constant state for a long time, and improving the comfort level of passengers and the stability of the operation of electrical equipment in the carriage.
In the above examples, the moisture content d is in g/kg, the temperature T is in deg.C, the enthalpy i is in kJ/kg, the saturated vapor pressure Psb is in KPa, the atmospheric pressure P is in KPa, and the air quantity Q isReturn air quantityAnd QFresh air quantityHas the unit of m3H, air density rho unit is kg/m3。
It should be understood that, although the respective steps in the flowcharts of fig. 3 to 5 are sequentially shown as indicated by arrows, the steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 3-5 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performing the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least some of the sub-steps or stages of other steps.
In one embodiment, a computer device is provided. The computer device may be a server. The computer device includes a processor, a memory, a network interface, and a database connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the computer device is used to store environmental parameters such as temperature and moisture content. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to realize a dehumidification method of the train air conditioning unit.
In one embodiment, a computer device is provided, which may be a terminal. The computer device includes a processor, a memory, a network interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to realize a dehumidification method of the train air conditioning unit. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like
In one embodiment, a computer device is provided, which includes a memory, a processor and a computer program stored in the memory and running on the processor, and when the processor executes the computer program, the steps in the method for dehumidifying train air conditioning units provided in the above embodiments are implemented.
In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, and the computer program is executed by a processor to implement the steps of the method for dehumidifying a train air conditioning unit provided by the above embodiments.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. The utility model provides a train air conditioning unit dehumidification system, a serial communication port, the system includes return air temperature and humidity sensor, new trend temperature and humidity sensor, air supply temperature and humidity sensor, main control board, first circulating device and second circulating device:
the return air temperature and humidity sensor is used for acquiring the return air temperature TReturn airAnd relative humidity psi of return airReturn airThe fresh air temperature and humidity sensor is used for acquiring fresh air temperature TFresh airRelative humidity psi of fresh airFresh airThe air supply temperature and humidity sensor is used for acquiring air supply temperature TAir supplyAnd relative humidity psi of the air supplyAir supply；
The main control board is used for controlling the main control board according to the target relative humidity psiTargetObtaining the target moisture content dTargetAccording to the target temperature TTargetAnd dTargetObtaining a target enthalpy value iTargetFrom the fresh air quantity QFresh airReturn air quantity QReturn airThe target enthalpy value iTargetObtaining the refrigerating capacity by the cold capacity of the carriage, and obtaining the fresh air quantity QFresh airThe return air volume QReturn airAnd the target enthalpy value iTargetObtaining the heating quantity;
the main control board controls the first circulating device to refrigerate according to the refrigerating capacity, and controls the second circulating device to heat according to the heating capacity.
2. The system of claim 1, wherein:
at the return air moisture content dReturn airIs greater than dTargetUnder the condition of the sum of the moisture content difference value △ d, the main control board controls the first circulating device to refrigerate according to the refrigerating capacity;
at d inReturn airIs greater than or equal to dTargetA difference from said △ d, and said dReturn airIs less than or equal toD is describedTargetAnd △ d, the main control board will use dReturn airAnd d isTargetCarrying out Proportional Integral Derivative (PID) calculation to obtain PID refrigerating capacity, and controlling the first circulating device to refrigerate according to the PID refrigerating capacity by the main control board;
at d inReturn airIs less than dTargetAnd △ d, the main control board controls the first circulation device to stop cooling.
3. The system of claim 1, wherein the master control board further comprises:
at return air temperature TReturn airLess than said TTargetUnder the condition of the difference with the temperature difference value △ T, the main control board controls the second circulating device to heat according to the heating quantity;
at the TReturn airLess than or equal to TTargetAnd the sum of said △ T, and TReturn airGreater than or equal to TTargetIn the case of the difference with the △ T, the main control board will use the TReturn airAnd said TTargetCarrying out PID calculation to obtain a PID heating quantity, and controlling the second circulating device to heat according to the PID heating quantity by the main control board;
at the TReturn airGreater than TTargetAnd △ T, the main control board controls the second circulation device to stop heating.
4. A method for dehumidifying an air conditioning unit of a train is characterized by comprising the following steps:
according to the target relative humidity psi in the trainTargetObtaining the target moisture content dTargetAccording to the target temperature TTargetAnd d isTargetObtaining a target enthalpy value iTarget；
Controlling a first circulating device of an air conditioning unit of the train to refrigerate according to refrigerating capacity, wherein the refrigerating capacity is the fresh air quantity QFresh airReturn air quantity QReturn airStation, stationThe target enthalpy value iTargetObtaining the cold quantity of the carriage;
controlling a second circulating device of the air conditioning unit to heat according to the heating capacity, wherein the heating capacity is obtained by the fresh air volume QFresh airThe return air volume QReturn airAnd the target enthalpy value iTargetAnd (6) obtaining.
5. The method of claim 4, wherein controlling the first circulation device of the train air conditioning unit to refrigerate according to the refrigerating capacity comprises one of:
at the return air moisture content dReturn airIs greater than dTargetAnd under the condition of the sum of the moisture content difference value △ d, controlling the first circulating device to refrigerate according to the refrigerating capacity;
at d inReturn airIs greater than or equal to dTargetA difference from said △ d, and said dReturn airIs less than or equal to dTargetAnd △ d, adding d toReturn airAnd d isTargetCarrying out Proportional Integral Derivative (PID) calculation to obtain PID refrigerating capacity, and controlling the first circulating device to refrigerate according to the PID refrigerating capacity;
at d inReturn airIs less than dTargetAnd △ d, controlling the first circulation device to stop cooling.
6. The method of claim 4, wherein controlling the second circulation device of the train air conditioning unit to perform heating according to the heating amount comprises one of:
at return air temperature TReturn airLess than said TTargetAnd the temperature difference value △ T, controlling the second circulating device to heat according to the heating quantity;
at the TReturn airLess than or equal to TTargetAnd the sum of said △ T, and TReturn airGreater than or equal to TTargetIn the case of the difference from the △ T, the T is setReturn airAnd saidTTargetCarrying out PID calculation to obtain PID heating quantity, and controlling the second circulating device to carry out heating according to the PID heating quantity;
at the TReturn airGreater than TTargetAnd △ T, the first circulation device is controlled to stop heating.
7. The method of any of claims 4 to 6, wherein the cooling and heating process further comprises:
condensing pressure P in the first circulation deviceRefrigeration systemIs greater than or equal to the upper limit value P of the refrigeration pressure of the first circulating deviceUpper limit ofIn the case of (3), controlling the first circulating device to perform condensation;
the evaporation pressure P in the second circulation deviceHeating apparatusLower limit value P of heating pressure of the second circulation deviceLower limit ofIn the case of (3), controlling the second circulating device to perform condensation;
at the PRefrigeration systemLess than or equal to PUpper limit ofAnd △ PUpper limit ofThe difference of PHeating apparatusGreater than or equal to PLower limit ofAnd △ PLower limit ofAnd controlling the first circulation device and the second circulation device to stop condensing under the condition of the sum of the target time and the target time, wherein the △ PUpper limit ofSaid △ P being the set point of the return difference of the pressure in the outdoor coil of said first circulating meansLower limit ofThe set value of the return difference of the pressure in the outdoor coil pipe of the second circulating device is obtained.
8. The method of claim 4, wherein controlling the second circulation device of the train air conditioning unit to generate heat according to the amount of heating further comprises:
carrying out PID calculation on the exhaust temperature of the compressor and the target exhaust temperature of the compressor to obtain a PID calculated value, and controlling the opening of a liquid spray electronic expansion valve arranged in a liquid spray cooling pipeline according to the PID calculated value, wherein the liquid spray cooling pipeline sprays refrigerant into an air suction port of the compressor, and the refrigerant circulates in the compressor to cool the compressor.
9. A computer device comprising a memory and a processor, the memory storing a computer program, wherein the processor implements the steps of the method of any one of claims 4 to 8 when executing the computer program.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 4 to 8.
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