CN105573366B - Cold chain compartment temperature control method and device based on compartment equalization - Google Patents
Cold chain compartment temperature control method and device based on compartment equalization Download PDFInfo
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- CN105573366B CN105573366B CN201510977831.9A CN201510977831A CN105573366B CN 105573366 B CN105573366 B CN 105573366B CN 201510977831 A CN201510977831 A CN 201510977831A CN 105573366 B CN105573366 B CN 105573366B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/1927—Control of temperature characterised by the use of electric means using a plurality of sensors
- G05D23/1928—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperature of one space
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Abstract
The present invention relates to a kind of cold chain compartment temperature control method based on compartment equalization and device, this method to include：Build the solid space model of interior；The boundary condition of solid space model is determined, mesh generation is carried out to three-dimensional spatial model；The temperature field of air flow field and cargo area in simulating stereo spatial model；Calculate the optimal opening/closing time interval of refrigeration unit, optimal opening/closing time at intervals of ensure agricultural product be in optimal refrigerating temperature range on the premise of refrigeration unit the minimum opening/closing time interval of energy consumption；According to optimal opening/closing time interval, the running status of refrigeration unit is controlled.The present invention is by way of the solid space model for establishing interior, calculate on the premise of ensureing that agricultural product are in optimal refrigerating temperature range under air flow field, make the optimal opening/closing time interval that refrigeration unit energy consumption is minimum, the cost of transportation of Refrigerated Transport is reduced on the premise of to ensure agricultural product quality, it is ensured that agricultural product quality and safety and the economic benefit for improving Refrigerated Transport.
Description
Technical field
The present invention relates to temperature control technology field, and in particular to a kind of cold chain compartment temperature control method based on compartment equalization
And device.
Background technology
Refrigerated Transport is link the most key in Cold Chain Logistics, while is also to ensure that agricultural product quality and safety is mostly important
A link.With raising of the people to cold chain food demand amount, nowadays the Refrigerated Transport amount of countries in the world is all constantly to add
Greatly, its Refrigerated Transport cost is also constantly increasing, and accordingly can also reduce the economic benefit of whole Cold Chain Logistics.Therefore, it is how smart
Really control Refrigerated Transport during interior temperature changing process, turn into correlative study scholar's research in recent years focus it
One.By controlling interior temperature change, it is transported agricultural product and extend its shelf life time while from damaging to plants caused by sudden drop in temperature, together
When also increase sales range as far as possible, realize more long-distance transportation.
However, during Refrigerated Transport, 40% diesel consumption is used for refrigeration system, and cost of transportation is very big.Therefore have
Necessity reduces Refrigerated Transport cost as far as possible when ensuring that agricultural product are in optimal refrigerating temperature range.
The content of the invention
The technical problems to be solved by the invention are how Refrigerated Transport to be reduced on the premise of agricultural product quality is ensured
Cost of transportation.
In order to solve the above technical problems, the present invention proposes a kind of cold chain compartment temperature control method based on compartment equalization
And device.
In a first aspect, this method includes：
According to the internal structure information in compartment, the solid space model of the interior is built；
The boundary condition of the solid space model is determined, and mesh generation is carried out to the solid space model；
According to the air supply velocity of refrigeration unit and the air-supply temperature of refrigeration unit in the initial temperature of cargo area in compartment, compartment
Degree, simulates the air flow field in the solid space model and the temperature field of cargo area；
According to the mean temperature in the mean temperature in air flow field and mean wind speed, cargo area temperature field, refrigeration unit
The optimal refrigerating temperature range of hot physical property infomation and agricultural product of power, agricultural product under different wind speed calculates refrigeration unit most
Excellent opening/closing time interval, before the optimal opening/closing time is at intervals of ensuring that agricultural product are in the optimal refrigerating temperature range
Put the minimum opening/closing time interval of the energy consumption of refrigeration unit；
According to the optimal opening/closing time interval, the running status of the refrigeration unit is controlled.
Optionally, the boundary condition for determining the solid space model includes：
Cool air outlet in the solid space model is arranged to inlet flow border, in the solid space model
The centrifugal circulated air machine side in blower fan lower surface is arranged to output flow border, and the cargo area in the solid space model is defined as
Porous media, the unoccupied region in the solid space model are defined as fluid；
The boundary condition of the solid space model is calculated, wherein：
The boundary condition includes wind pushing temperature boundary value and air supply velocity boundary value, the wind pushing temperature boundary value and institute
Stating the calculating process of air supply velocity boundary value includes：
According to the temperature of multiple location points at compartment cool air outlet, the mean temperature at cool air outlet is calculated, and will
Wind pushing temperature boundary value of the mean temperature as the solid space Model Inlet flow boundary；
According to the wind speed of multiple location points at compartment cool air outlet, the mean wind speed at cool air outlet is calculated, and will
Air supply velocity boundary value of the mean wind speed as the solid space Model Inlet flow boundary.
Optionally, the acquisition methods of the temperature of multiple location points include at the compartment cool air outlet：
Two temperature sensors are set at compartment cool air outlet, gathered detected by two temperature sensors
Temperature.
Optionally, the acquisition methods of the wind speed of multiple location points include at the compartment cool air outlet：
Three air velocity transducers, the wind that three air velocity transducers of collection are detected are set at compartment cool air outlet
Speed.
Optionally, the air supply velocity and refrigeration according to refrigeration unit in the initial temperature of cargo area in compartment, compartment
The wind pushing temperature of unit, the air flow field in the solid space model and the temperature field of cargo area are simulated, including：
Obtain the turbulence characteristics yardstick of the solid space model；
According to the temperature computation stream of the turbulence characteristics yardstick, the wind speed of the multiple opening position and the multiple opening position
Body Reynolds number, turbulent flow length dimension, tubulence energy and turbulent flow compare dissipative shock wave；
According to the fluid Reynolds number, the turbulent flow length dimension, the tubulence energy and the turbulent flow than dissipative shock wave, use
Hydrodynamics method for numerical simulation simulates the air flow field in the solid space model and the temperature field of cargo area.
Optionally, the acquisition methods of the initial temperature of cargo area include in compartment：It is wireless that probe-type is inserted in agricultural product
Temperature sensor, the initial temperature using the temperature detected by the probe-type radio temperature sensor as cargo area.
Optionally, the hot physical property infomation of the agricultural product includes density, water content, specific heat capacity, the thermal conductivity of agricultural product
And/or heat absorption rate.
Optionally, the density of the agricultural product is determined using immersion liquid suspension method, the density is specifically calculated using following formula：
Wherein, ρPFor the density of agricultural product, mpFor the quality of agricultural product, ρwThe density of solution is used by immersion liquid suspension method,
maBy agricultural product, immersion liquid suspension method using the quality sum of solution and the container of accommodating solution, mowAdopted by immersion liquid suspension method
With the quality of solution；And/or
The specific heat capacity is calculated using following formula：
Wherein,For the moisture of agricultural product, cpFor the specific heat capacity of agricultural product；And/or
The thermal conductivity is calculated using following formula：
Wherein, λpFor thermal conductivity；And/or
The heat absorption rate is calculated using following formula：
Qr=ρPqrVP
Wherein, QrFor heat absorption rate, ρPFor the density of agricultural product, VPFor the volume of agricultural product, qrTo breathe rate of heat generation.
Second aspect, the device include：
Model building module, for the internal structure information according to compartment, build the solid space mould of the interior
Type；
Model setup module, for determining the boundary condition of the solid space model, and to the solid space model
Carry out mesh generation；
Field stimulation module, for the air supply velocity according to refrigeration unit in the initial temperature of cargo area in compartment, compartment and
The wind pushing temperature of refrigeration unit, simulate the air flow field in the solid space model and the temperature field of cargo area；
Computing module, for according to being averaged in the mean temperature in air flow field and mean wind speed, cargo area temperature field
Power, the optimal refrigerating temperature range meter of hot physical property infomation and agricultural product of agricultural product of temperature, refrigeration unit under different wind speed
Calculate the optimal opening/closing time interval of refrigeration unit, the optimal opening/closing time is at intervals of ensuring that agricultural product are in the optimal refrigeration
The minimum opening/closing time interval of the energy consumption of refrigeration unit on the premise of in temperature range；
Control module, for according to the optimal opening/closing time interval, controlling the running status of the refrigeration unit.
Optionally, the device also includes：
Human-computer interaction module, the information for user to be inputted are sent to corresponding module, the information of user's input
Including the air supply velocity of refrigeration unit in internal structure information, compartment, the wind pushing temperature of refrigeration unit, cargo area initial temperature
Degree, power, the hot physical property infomation and agricultural product optimal refrigerating temperature range of agricultural product of the refrigeration unit under different wind speed；
Optimization module, for adjusting deficient relaxation factor, accelerate the convergence of the simulation process of the field stimulation module.
In cold chain compartment temperature control method provided by the invention and device, using the solid space mould for establishing interior
The mode of type, the first temperature field of the air flow field in simulating stereo spatial model and cargo area, then calculate the air stream
On the premise of ensureing that agricultural product are in optimal refrigerating temperature range off field, make the optimal opening/closing time that refrigeration unit energy consumption is minimum
Interval, then utilizes the opening and closing of the optimal time Separation control refrigeration unit.It can be seen that the present invention can ensure agricultural product quality
On the premise of reduce the cost of transportation of Refrigerated Transport, it can be ensured that agricultural product quality and safety and the economic effect for improving Refrigerated Transport
Benefit.
Brief description of the drawings
By reference to accompanying drawing can be more clearly understood the present invention characteristic information and advantage, accompanying drawing be schematically without
It is interpreted as carrying out any restrictions to the present invention, in the accompanying drawings：
Fig. 1 is shown to be shown according to the flow of the embodiment of cold chain compartment temperature control method one of the present invention based on compartment equalization
It is intended to；
Fig. 2 shows the structural frames according to cold chain compartment temperature control device one embodiment of the present invention based on compartment equalization
Figure.
Embodiment
It is below in conjunction with the accompanying drawings and specific real in order to be more clearly understood that the above objects, features and advantages of the present invention
Mode is applied the present invention is further described in detail.It should be noted that in the case where not conflicting, the implementation of the application
Feature in example and embodiment can be mutually combined.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still, the present invention may be used also
To be different from other modes described here using other to implement, therefore, protection scope of the present invention is not by described below
Specific embodiment limitation.
The present invention provides a kind of cold chain compartment temperature control method based on compartment equalization, as shown in figure 1, this method bag
Include：
Step S1, according to the internal structure information in compartment, the solid space model of the interior is built；
Step S2, the boundary condition of the solid space model is determined, and grid is carried out to the solid space model and drawn
Point；
Step S3, according to the air supply velocity and refrigeration unit of refrigeration unit in the initial temperature of cargo area in compartment, compartment
Wind pushing temperature, simulate the air flow field in the solid space model and the temperature field of cargo area；
Step S4, according to the mean temperature in the mean temperature in air flow field and mean wind speed, cargo area temperature field, system
The optimal refrigerating temperature range of power, the hot physical property infomation and agricultural product of agricultural product of the cold group under different wind speed calculates refrigeration machine
The optimal opening/closing time interval of group, the optimal opening/closing time is at intervals of ensuring that agricultural product are in the optimal refrigerating temperature range
The minimum opening/closing time interval of the energy consumption of refrigeration unit on the premise of interior；
Step S5, according to the optimal opening/closing time interval, the running status of the refrigeration unit is controlled.
In cold chain compartment temperature control method provided by the invention, using the side for the solid space model for establishing interior
Formula, the first temperature field of the air flow field in simulating stereo spatial model and goods, then calculate and ensure under the air flow field
On the premise of agricultural product are in optimal refrigerating temperature range, make the optimal opening/closing time interval that refrigeration unit energy consumption is minimum, so
The opening and closing of the optimal time Separation control refrigeration unit is utilized afterwards.It can be seen that the present invention can ensure the premise of agricultural product quality
The lower cost of transportation for reducing Refrigerated Transport, it can be ensured that agricultural product quality and safety and the economic benefit for improving Refrigerated Transport.
Understandable to be, so-called internal structure information may include the dimension information of interior, agricultural product in compartment
Stacking form, pallet dimension, packing case size etc..So-called mesh generation refers to carry out unit to the solid space model of foundation
Lattice divide, and are divided for example with the cell of 5cm sizes.
Those skilled in the art by air flow field it should be appreciated that can learn air stream in non-cargo area space emotionally
Condition, it can learn that temperature is with time, the situation of change of locus point in cargo area by the temperature field of cargo area.
In the specific implementation, determine that the boundary condition of the solid space model may include in step S2：
Cool air outlet in the solid space model is arranged to inlet flow border, in the solid space model
The centrifugal circulated air machine side in blower fan lower surface is arranged to output flow border, and the cargo area in the solid space model is defined as
Porous media, the unoccupied region in the solid space model are defined as fluid；
The boundary condition of the solid space model is calculated, wherein：
The boundary condition includes wind pushing temperature boundary value and air supply velocity boundary value, the wind pushing temperature boundary value and institute
Stating the calculating process of air supply velocity boundary value includes：
According to the temperature of multiple location points at compartment cool air outlet, the mean temperature at cool air outlet is calculated, and will
Wind pushing temperature boundary value of the mean temperature as the solid space Model Inlet flow boundary；
According to the wind speed of multiple location points at compartment cool air outlet, the mean wind speed at cool air outlet is calculated, and will
Air supply velocity boundary value of the mean wind speed as the solid space Model Inlet flow boundary.
Here, it is determined that in the boundary condition of solid space model, it is first determined the boundary condition class of solid space model
Type, then calculation of boundary conditions.
Those skilled in the art it should be appreciated that boundary condition may also include the initial temperature of cargo area in compartment,
The initial temperature of cold air and initial wind speed etc..
The acquisition methods of temperature, wind speed employed in said process are unlimited, and one way in which is：Surveyed by sensor
Amount, the mode of data line transfer obtain.
Wherein, the acquisition methods of the temperature of multiple location points may include at compartment cool air outlet：
Two temperature sensors are set at compartment cool air outlet, gathered detected by two temperature sensors
Temperature.The temperature of each position point can be obtained by the way of periodicity gathers in practice, such as 5min collections are once.May be used also
Preserved with the data to collection, to facilitate the work such as follow-up checking, analysis.
Wherein, the acquisition methods of the wind speed of multiple location points may include at compartment cool air outlet：
Three air velocity transducers, the wind that three air velocity transducers of collection are detected are set at compartment cool air outlet
Speed.The wind speed of each position point can be obtained by the way of periodicity gathers in practice, such as 5min collections are once.Can be with
The data of collection are preserved, to facilitate the work such as follow-up checking, analysis.
In the specific implementation, according to the air-supply of refrigeration unit in the initial temperature of cargo area in compartment, compartment in step S3
The wind pushing temperature of speed and refrigeration unit, the air flow field in the solid space model and the temperature field of cargo area are simulated, wrapped
Include：
Obtain the turbulence characteristics yardstick of the solid space model；
According to the temperature computation stream of the turbulence characteristics yardstick, the wind speed of the multiple opening position and the multiple opening position
Body Reynolds number, turbulent flow length dimension, tubulence energy and turbulent flow compare dissipative shock wave；
According to the fluid Reynolds number, the turbulent flow length dimension, the tubulence energy and the turbulent flow than dissipative shock wave, use
Hydrodynamics method for numerical simulation simulates the air flow field in the solid space model and the temperature field of cargo area.
Fluid reynolds number Re, turbulent flow length dimension l, tubulence energy κ and turbulent flow are as follows than dissipative shock wave ω calculation formula：
Re=VL ρ/μ；L=0.07L；κ=1.5 (Vl) 2；ω=l (κ 1/2/C1/4)；
Wherein, ρ is atmospheric density, and μ is air force viscosity, C=0.09.
It will be apparent to a skilled person that the process using hydrodynamics method for numerical simulation simulated air flow field
Can be：To use SST κ-ω equation model when calculating, the separate type based on pressure solves for selection solver and running environment
Device, momentum, energy, tubulence energy, the discrete scheme of diffusivity are single order upstreame scheme, and pressure x velocity coupling process uses PISO
(Pressure Implicit with Splitting of Operators) algorithm.
In the specific implementation, the acquisition methods of the initial temperature of cargo area include in compartment：Probe is inserted in agricultural product
Formula radio temperature sensor, the initial temperature using the temperature detected by the probe-type radio temperature sensor as cargo area
Degree.
In the specific implementation, the hot physical property infomation of agricultural product includes density, water content, specific heat capacity, the thermal conductivity of agricultural product
Rate and/or heat absorption rate.
In the specific implementation, immersion liquid suspension method can be used to determine the density of the agricultural product.So-called immersion liquid suspension method
Refer to place in agricultural product and measure to obtain the method for its density in a liquid, for example, apple is placed in water container,
While avoiding the apple from being contacted with container wall, when apple is dipped in completely in water, and being in suspended state, related ginseng is recorded
Number, the calculating of apple density is carried out according to these parameters.
Formula is used by calculating in this way：
Wherein, ρPFor the density of agricultural product, mpFor the quality of agricultural product, ρwThe density of solution is used by immersion liquid suspension method,
maBy agricultural product, immersion liquid suspension method using the quality sum of solution and the container of accommodating solution, mowAdopted by immersion liquid suspension method
With the quality of solution.
In the specific implementation, following formula can be used to calculate specific heat capacity：
Wherein,For the moisture of agricultural product, cpFor the specific heat capacity of agricultural product.
In the specific implementation, following formula can be used to calculate thermal conductivity：
Wherein, λpFor thermal conductivity.
In the specific implementation, following formula can be used to calculate heat absorption rate：
Qr=ρPqrVP
Wherein, QrFor heat absorption rate, ρPFor the density of agricultural product, VPFor the volume of agricultural product, qrTo breathe rate of heat generation,
The breathing rate of heat generation is calculated using following formula：
qr=0.003f (1.8Tp+32)g
Wherein, TpFor the temperature of agricultural product, f ()gFor the generation rate function of agricultural product.
Based on identical inventive concept, the present invention also provides a kind of cold chain compartment temperature control dress based on compartment equalization
Put, as described in Figure 2, the device includes：
Model building module, for the internal structure information according to compartment, build the solid space mould of the interior
Type；
Model setup module, for determining the boundary condition of the solid space model, and to the solid space model
Carry out mesh generation；
Field stimulation module, for the air supply velocity according to refrigeration unit in the initial temperature of cargo area in compartment, compartment and
The wind pushing temperature of refrigeration unit, simulate the air flow field in the solid space model and the temperature field of cargo area；
Computing module, for according to being averaged in the mean temperature in air flow field and mean wind speed, cargo area temperature field
Power, the optimal refrigerating temperature range meter of hot physical property infomation and agricultural product of agricultural product of temperature, refrigeration unit under different wind speed
Calculate the optimal opening/closing time interval of refrigeration unit, the optimal opening/closing time is at intervals of ensuring that agricultural product are in the optimal refrigeration
The minimum opening/closing time interval of the energy consumption of refrigeration unit on the premise of in temperature range；
Control module, for according to the optimal opening/closing time interval, controlling the running status of the refrigeration unit.
Optionally, as shown in Fig. 2 the device may also include：
Human-computer interaction module, the information for user to be inputted are sent to corresponding module, the information of user's input
Including the air supply velocity of refrigeration unit in internal structure information, compartment, the wind pushing temperature of refrigeration unit, cargo area initial temperature
Degree, power, the hot physical property infomation and agricultural product optimal refrigerating temperature range of agricultural product of the refrigeration unit under different wind speed；
Optimization module, for adjusting deficient relaxation factor, accelerate the convergence of the simulation process of the field stimulation module.
Cold chain compartment temperature control device provided by the invention is cold chain compartment temperature control method provided by the invention
Function structure module, its explanation about part, explanation and beneficial effect refer to cold chain compartment temperature control method of the present invention
In appropriate section, repeat no more here.
Although being described in conjunction with the accompanying embodiments of the present invention, those skilled in the art can not depart from this hair
Various modifications and variations are made in the case of bright spirit and scope, such modifications and variations are each fallen within by appended claims
Within limited range.
Claims (10)
- A kind of 1. cold chain compartment temperature control method based on compartment equalization, it is characterised in that including：According to the internal structure information in compartment, the solid space model of the interior is built, wherein the internal structure is believed Breath is including at least the dimension information of interior, goods stacking form, pallet dimension and packing case size in compartment；The boundary condition of the solid space model is determined, and mesh generation is carried out to the solid space model, wherein described Initial temperature and compartment of the boundary condition including at least cargo area in wind pushing temperature boundary value, air supply velocity boundary value, compartment The initial temperature of interior cold air and initial wind speed；According to the air supply velocity of refrigeration unit and the wind pushing temperature of refrigeration unit in the initial temperature of cargo area in compartment, compartment, Simulate the air flow field in the solid space model and the temperature field of cargo area；According to the mean temperature in the mean temperature in air flow field and mean wind speed, cargo area temperature field, refrigeration unit not Optimal refrigerating temperature range calculating the optimal of refrigeration unit of hot physical property infomation and agricultural product with the power under wind speed, agricultural product is opened Time interval is closed, on the premise of the optimal opening/closing time is at intervals of ensuring that agricultural product are in the optimal refrigerating temperature range The minimum opening/closing time interval of the energy consumption of refrigeration unit；According to the optimal opening/closing time interval, the running status of the refrigeration unit is controlled.
- 2. according to the method for claim 1, it is characterised in thatThe boundary condition for determining the solid space model includes：Cool air outlet in the solid space model is arranged to inlet flow border, the solid space model inner blower The centrifugal circulated air machine side in lower surface is arranged to output flow border, and the cargo area in the solid space model is defined as porous Medium, the unoccupied region in the solid space model are defined as fluid；The boundary condition of the solid space model is calculated, wherein：The boundary condition includes wind pushing temperature boundary value and air supply velocity boundary value, the wind pushing temperature boundary value and described send The calculating process of wind velocity boundary value includes：According to the temperature of multiple location points at compartment cool air outlet, the mean temperature at cool air outlet is calculated, and this is put down Equal wind pushing temperature boundary value of the temperature as the solid space Model Inlet flow boundary；According to the wind speed of multiple location points at compartment cool air outlet, the mean wind speed at cool air outlet is calculated, and this is put down Equal air supply velocity boundary value of the wind speed as the solid space Model Inlet flow boundary.
- 3. according to the method for claim 2, it is characterised in thatThe acquisition methods of the temperature of multiple location points include at the compartment cool air outlet：Two temperature sensors are set at compartment cool air outlet, gather the temperature detected by two temperature sensors Degree.
- 4. according to the method for claim 2, it is characterised in thatThe acquisition methods of the wind speed of multiple location points include at the compartment cool air outlet：Three air velocity transducers, the wind speed that three air velocity transducers of collection are detected are set at compartment cool air outlet.
- 5. according to the method for claim 1, it is characterised in thatIt is described according to the air supply velocity of refrigeration unit and the air-supply temperature of refrigeration unit in the initial temperature of cargo area in compartment, compartment Degree, simulates the air flow field in the solid space model and the temperature field of cargo area, including：Obtain the turbulence characteristics yardstick of the solid space model；According to more at the wind speed and compartment cool air outlet of multiple opening positions at the turbulence characteristics yardstick, compartment cool air outlet Temperature computation fluid Reynolds number, turbulent flow length dimension, tubulence energy and the turbulent flow of individual opening position compare dissipative shock wave；According to the fluid Reynolds number, the turbulent flow length dimension, the tubulence energy and the turbulent flow than dissipative shock wave, using fluid Mechanics method for numerical simulation simulates the air flow field in the solid space model and the temperature field of cargo area.
- 6. according to the method for claim 1, it is characterised in thatThe acquisition methods of the initial temperature of cargo area include in compartment：Probe-type radio temperature sensor is inserted in agricultural product, Initial temperature using the temperature detected by the probe-type radio temperature sensor as cargo area.
- 7. according to the method for claim 1, it is characterised in thatThe hot physical property infomation of the agricultural product includes density, water content, specific heat capacity, thermal conductivity and/or the heat absorption rate of agricultural product.
- 8. according to the method for claim 7, it is characterised in thatThe density of the agricultural product is determined using immersion liquid suspension method, the density is specifically calculated using following formula：<mrow> <msub> <mi>&rho;</mi> <mi>P</mi> </msub> <mo>=</mo> <mfrac> <mrow> <msub> <mi>m</mi> <mi>p</mi> </msub> <msub> <mi>&rho;</mi> <mi>w</mi> </msub> </mrow> <mrow> <msub> <mi>m</mi> <mi>a</mi> </msub> <mo>-</mo> <msub> <mi>m</mi> <mrow> <mi>o</mi> <mi>w</mi> </mrow> </msub> </mrow> </mfrac> </mrow>Wherein, ρPFor the density of agricultural product, mpFor the quality of agricultural product, ρwThe density of solution, m are used by immersion liquid suspension methodaFor Agricultural product, immersion liquid suspension method use the quality sum of the container of solution and accommodating solution, mowBy immersion liquid suspension method using molten The quality of liquid；And/orThe specific heat capacity is calculated using following formula：<mrow> <msub> <mi>c</mi> <mi>p</mi> </msub> <mo>=</mo> <mn>33.5</mn> <msub> <mi>P</mi> <mrow> <msub> <mi>h</mi> <mn>2</mn> </msub> <mi>o</mi> </mrow> </msub> <mo>+</mo> <mn>837</mn> </mrow>Wherein,For the moisture of agricultural product, cpFor the specific heat capacity of agricultural product；And/orThe thermal conductivity is calculated using following formula：<mrow> <msub> <mi>&lambda;</mi> <mi>p</mi> </msub> <mo>=</mo> <mn>0.148</mn> <mo>+</mo> <mn>0.493</mn> <mrow> <mo>(</mo> <mfrac> <msub> <mi>P</mi> <mrow> <msub> <mi>h</mi> <mn>2</mn> </msub> <mi>o</mi> </mrow> </msub> <mn>100</mn> </mfrac> <mo>)</mo> </mrow> </mrow>Wherein, λpFor thermal conductivity；And/orThe heat absorption rate is calculated using following formula：Qr=ρPqrVPWherein, QrFor heat absorption rate, ρPFor the density of agricultural product, VPFor the volume of agricultural product, qrTo breathe rate of heat generation.
- A kind of 9. cold chain compartment temperature control device based on compartment equalization, it is characterised in that including：Model building module, for the internal structure information according to compartment, the solid space model of the interior is built, its Described in internal structure information comprise at least the dimension information of interior, goods stacking form, pallet dimension and bag in compartment Packing measurement(s)；Model setup module, carried out for determining the boundary condition of the solid space model, and to the solid space model Mesh generation, wherein the boundary condition is including at least cargo area in wind pushing temperature boundary value, air supply velocity boundary value, compartment The initial temperature of cold air and initial wind speed in initial temperature and compartment；Field stimulation module, for the air supply velocity and refrigeration according to refrigeration unit in the initial temperature of cargo area in compartment, compartment The wind pushing temperature of unit, simulate the air flow field in the solid space model and the temperature field of cargo area；Computing module, for according to the mean temperature in the mean temperature in air flow field and mean wind speed, cargo area temperature field, The optimal refrigerating temperature range of power, the hot physical property infomation and agricultural product of agricultural product of the refrigeration unit under different wind speed calculates refrigeration The optimal opening/closing time interval of unit, the optimal opening/closing time is at intervals of ensuring that agricultural product are in the optimal refrigerated storage temperature model The minimum opening/closing time interval of the energy consumption of refrigeration unit on the premise of in enclosing；Control module, for according to the optimal opening/closing time interval, controlling the running status of the refrigeration unit.
- 10. device according to claim 9, it is characterised in that also include：Human-computer interaction module, the information for user to be inputted, which is sent to corresponding module, the information of user's input, to be included The air supply velocity of refrigeration unit, the wind pushing temperature of refrigeration unit, the initial temperature of cargo area, system in internal structure information, compartment Power, the hot physical property infomation and agricultural product optimal refrigerating temperature range of agricultural product of the cold group under different wind speed；Optimization module, for adjusting deficient relaxation factor, accelerate the convergence of the simulation process of the field stimulation module.
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| CN201510977831.9A CN105573366B (en) | 2015-12-23 | 2015-12-23 | Cold chain compartment temperature control method and device based on compartment equalization |
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| CN201510977831.9A CN105573366B (en) | 2015-12-23 | 2015-12-23 | Cold chain compartment temperature control method and device based on compartment equalization |
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