Calculation method for daily door-opening ventilation times of cold-chain logistics refrigeration house temperature-control hallway

Abstract

The invention provides a method for calculating the daily door-opening ventilation times of temperature-control hall-penetrating of a cold-chain logistics refrigeration house, which is based on theoretical numerical calculation and is combined with the actual condition of logistics operation, so that influence factors of the daily door-opening ventilation times of temperature-control hall-penetrating of the cold-chain logistics refrigeration house can be comprehensively and reasonably understood. The method comprises the following steps: (1) determining summer outdoor atmospheric pressure of a place where a cold-chain logistics refrigeration house engineering project is located; (2) calculating an atmospheric pressure correction coefficient; (3) determining the number of loading and unloading ports in the temperature control penetrating chamber; (4) calculating the area of a loading and unloading port; (5) calculating the temperature-control hall-penetrating net volume; (6) determining a kneading surface air inlet coefficient in the temperature-control hall-penetrating loading and unloading opening; (7) determining the same-period operation coefficients of all loading and unloading ports of the temperature control hall; (8) determining a door seal leakage coefficient of the temperature-control hallway loading and unloading port; (9) measuring the airflow velocity; (10) determining the working time of daily operation; and (11) calculating the daily door opening ventilation frequency of the cold-chain logistics refrigeration house temperature control penetration.

Description

Technical Field

[0001] The present invention belongs to the technical field of the design of refrigeration systems for cold chain logistics cold storages, and particularly relates to a calculation method for the daily door opening and ventilation times of a temperature-controlled corridor in a cold chain logistics cold storage. Background Art

[0002] With the development of the national economy, the improvement of people's living standards, and the policy requirement of the operation mode of "constant cold for goods" and "unceasing chain for cold chain", a large number of cold chain logistics cold storages with enclosed temperature-controlled corridors have been built accordingly.

[0003] The temperature-controlled corridor of a cold chain logistics cold storage needs to be equipped with a refrigeration system to ensure that the temperature in the temperature-controlled corridor is within the specified range. The refrigeration equipment in the refrigeration system needs to be selected according to the cooling load. In the process of calculating the cooling load, one of the operating heat quantities, that is, the opening heat, needs to be calculated through the daily door opening and ventilation times, and the daily door opening and ventilation times have a greater impact on the design of the refrigeration system and the cooling effect of the temperature-controlled corridor.

[0004] In the content of the "Design Standard for Cold Storages" GB50072-2021, there are no regulations and calculation methods for the daily door opening and ventilation times. In relevant design books such as the "Refrigeration Design Manual for Cold Storages" and the "Practical Refrigeration and Air Conditioning Engineering Manual", it is stipulated that the daily door opening and ventilation times can be obtained according to the door opening and ventilation times diagram of the cold storage compartment in the book. The above-mentioned door opening and ventilation times diagram of the cold storage compartment is applicable to storage-type cold storages with few door openings. If the daily door opening and ventilation times of a cold chain logistics cold storage are obtained according to the above-mentioned door opening and ventilation times diagram of the cold storage compartment, according to engineering cases, the designed refrigeration system cannot meet the cooling requirements.

[0005] At present, some design institutes or engineering companies estimate the cooling load of the temperature-controlled corridor of a cold chain logistics cold storage, resulting in an overestimated or underestimated cooling load, which affects the safe and efficient operation of the refrigeration system, and there is no basis for the design, and the cooling load calculation book is missing items.

[0006] So far, no calculation method for calculating the daily door opening and ventilation times of the temperature-controlled corridor of a cold chain logistics cold storage according to the actual situation of cold chain logistics cold storage operation has been encountered. Scientifically and reasonably calculating the daily door opening and ventilation times of the temperature-controlled corridor of a cold chain logistics cold storage can ensure that the refrigeration system achieves the cooling effect of the temperature-controlled corridor under efficient and safe operating conditions, provide a basis for the cooling load calculation of design units and engineering units, and provide a reference for the compilation of refrigeration design manuals and standards for cold storages. Summary of the Invention

[0007] The purpose of the present invention is to overcome the above-mentioned deficiencies existing in the prior art, and provide a calculation method for the daily door opening and ventilation times of a temperature-controlled corridor of a cold chain logistics cold storage with reasonable design. Based on theoretical numerical calculations and combined with the actual situation of logistics operations, it can comprehensively and reasonably understand the influencing factors of the daily door opening and ventilation times of the temperature-controlled corridor of a cold chain logistics cold storage.

[0008] The technical solution adopted by the present invention to solve the above problems is as follows: A calculation method for the daily door opening and ventilation times of a temperature-controlled corridor in a cold chain logistics cold storage, characterized by comprising the following steps:

[0009] (1) Determine the engineering geographical location of the cold chain logistics cold storage, and determine the summer outdoor atmospheric pressure at the location of the cold chain logistics cold storage project.

[0010] (2) Calculate the atmospheric pressure correction coefficient for the daily door opening and ventilation times of the temperature-controlled corridor.

[0011] (3) Determine the target range of the temperature-controlled corridor in the cold chain logistics cold storage, and determine the number of loading and unloading ports in the temperature-controlled corridor according to the building drawings.

[0012] (4) Determine the boundary range of the loading and unloading ports in the temperature-controlled corridor of the cold chain logistics cold storage, determine the boundary dimensions of one loading and unloading port according to the building drawings, and calculate the area of one loading and unloading port.

[0013] (5) Determine the boundary range of the temperature-controlled corridor in the cold chain logistics cold storage, determine the boundary dimensions of the temperature-controlled corridor according to the building drawings, and calculate the net volume of the temperature-controlled corridor.

[0014] (6) Determine the intake coefficient of the neutral plane of the loading and unloading ports in the temperature-controlled corridor.

[0015] (7) Determine the synchronous operation coefficient of all loading and unloading ports in the temperature-controlled corridor.

[0016] (8) Determine the leakage coefficient of the door seals of the loading and unloading ports in the temperature-controlled corridor.

[0017] (9) Measure the air flow velocity of the summer external air entering the temperature-controlled corridor through the gap between the door seal and the refrigerated truck compartment in the cold chain logistics cold storage.

[0018] (10) Determine the daily operating hours of the temperature-controlled corridor.

[0019] (11) Calculate the daily door opening and ventilation times of the temperature-controlled corridor in the cold chain logistics cold storage.

[0020] In step (1) of the present invention, by referring to the "Code for Design of Heating, Ventilation and Air Conditioning of Industrial Buildings"

[0021] GB50019-2015, determine the summer outdoor atmospheric pressure at the location of the cold chain logistics cold storage project.

[0022] In step (2) of the present invention, the calculation method of the atmospheric pressure correction coefficient ξ is as follows: Ρ is the summer outdoor atmospheric pressure at the location of the cold chain logistics cold storage project.

[0023] In step (4) of the present invention, the calculation method of the area S of one loading and unloading port is as follows: S = W1 ×H 1 ; W 1 is the width of the temperature-controlled cross-passage loading and unloading opening; H 1 is the height of the temperature-controlled cross-passage loading and unloading opening.

[0024] In step (5) of the present invention, the calculation method of the net volume V of the temperature-controlled cross-passage is as follows: V = L × W 2 ×H 2 ; L is the net length of the temperature-controlled cross-passage of the cold chain logistics cold storage; W 2 is the net width of the temperature-controlled cross-passage of the cold chain logistics cold storage; H 2 is the net height of the temperature-controlled cross-passage of the cold chain logistics cold storage.

[0025] In step (6) of the present invention, assuming that there is an ideal plane where the pressures inside and outside the warehouse are equal in the vertical direction of the loading and unloading opening, this plane is the neutral plane, and the intake coefficient θ of the neutral plane of the temperature-controlled cross-passage loading and unloading opening is determined to be 0.5.

[0026] In step (8) of the present invention, the leakage coefficient ε of the door seal of the temperature-controlled cross-passage loading and unloading opening is determined to be 0.05.

[0027] In step (9) of the present invention, a digital tachometer is used to measure the air flow velocities at three positions, namely, slightly above, slightly below, along the height direction of the loading and unloading opening of the temperature-controlled cross-passage of the cold chain logistics cold storage, and the average value is taken to obtain the air flow velocity of the external air in summer of the cold chain logistics cold storage entering the temperature-controlled cross-passage through the door seal and the refrigerated truck compartment.

[0028] In step (11) of the present invention, the calculation method of the daily door opening and ventilation frequency N is as follows:

[0029]

[0030] In the formula: N is the daily door opening and ventilation frequency of the temperature-controlled cross-passage;

[0031] n is the number of loading and unloading openings of the temperature-controlled cross-passage;

[0032] S is the area of one loading and unloading opening of the temperature-controlled cross-passage;

[0033] θ is the intake coefficient of the neutral plane of the temperature-controlled cross-passage loading and unloading opening;

[0034] η is the synchronous operation coefficient of all loading and unloading openings of the temperature-controlled cross-passage;

[0035] ε is the leakage coefficient of the door seal of the temperature-controlled cross-passage loading and unloading opening;

[0036] ω is the air flow velocity of the external air in summer of the cold chain logistics cold storage entering the temperature-controlled cross-passage through the gap between the door seal and the refrigerated truck compartment;

[0037] Τ is the working time of the daily operation of the temperature-controlled cross-passage;

[0038] ξ is the atmospheric pressure correction coefficient;

[0039] V is the net volume of the temperature-controlled vestibule.

[0040] The simultaneous operation coefficient described in the present invention takes a value of 2 / 3.

[0041] Compared with the prior art, the present invention has the following advantages and effects: Through a scientific and reasonable calculation method, according to the actual situation of cold chain logistics operation, the daily door opening and ventilation times of the temperature-controlled vestibule are calculated, which can design the refrigeration system more accurately, ensure that the refrigeration system of the cold chain logistics cold storage operates under safe and efficient working conditions, and prevent adverse situations such as insufficient cooling capacity resulting in the failure to meet the requirements of the cooling effect and excessive cooling capacity resulting in energy waste. Description of the Drawings

[0042] Figure 1 It is a flowchart of an embodiment of the present invention. Detailed Embodiments

[0043] The following further describes the present invention in detail with reference to the drawings and through embodiments. The following embodiments are explanations of the present invention and the present invention is not limited to the following embodiments.

[0044] The calculation method for the daily door opening and ventilation times of the temperature-controlled vestibule of the cold chain logistics cold storage in the embodiment of the present invention includes the following steps:

[0045] (1) Determine the engineering geographical location of the cold chain logistics cold storage, check the "Code for Design of Heating, Ventilation and Air Conditioning of Industrial Buildings" GB50019-2015, and determine the summer outdoor atmospheric pressure P of the cold chain logistics cold storage project location, with the unit of hPa.

[0046] (2) Calculate the atmospheric pressure correction coefficient ξ for the daily door opening and ventilation times of the temperature-controlled vestibule, and the calculation method is as follows:

[0047]

[0048] In the formula: Ρ is the summer outdoor atmospheric pressure of the cold chain logistics cold storage project location, with the unit of hPa. (3) Determine the target range of the temperature-controlled vestibule of the cold chain logistics cold storage, and determine the number n of loading and unloading openings in the temperature-controlled vestibule according to the building drawings.

[0049] (4) Determine the boundary range of the loading and unloading openings of the temperature-controlled vestibule of the cold chain logistics cold storage, and determine the boundary dimensions of one loading and unloading opening according to the building drawings; calculate the area S of this loading and unloading opening, and the calculation method is as follows:

[0050] S = W 1 × Η 1 ,

[0051] Where: W 1 is the width of the temperature-controlled through-loading opening, with the unit of m;

[0052] Η 1 is the height of the temperature-controlled through-loading opening, with the unit of m.

[0053] (5) Determine the boundary range of the temperature-controlled through-loading area of the cold chain logistics cold storage, and determine the boundary dimensions of this temperature-controlled through-loading area according to the building drawings; calculate the net volume V of the temperature-controlled through-loading area, and the calculation method is as follows: V = L × W 2 × Η 2 , where: L is the net length of the temperature-controlled through-loading area of the cold chain logistics cold storage, with the unit of m; W 2 is the net width of the temperature-controlled through-loading area of the cold chain logistics cold storage, with the unit of m; Η 2 is the net height of the temperature-controlled through-loading area of the cold chain logistics cold storage, with the unit of m.

[0054] (6) Determine the intake coefficient θ of the neutral plane of the temperature-controlled through-loading opening.

[0055] Assume that there is an ideal plane where the pressures inside and outside the warehouse are equal in the vertical direction of the loading and unloading opening. This plane is the neutral plane, and determine that the intake coefficient θ of the neutral plane of the temperature-controlled through-loading opening is 0.5.

[0056] (7) Determine the synchronous operation coefficient η of all loading and unloading openings of the temperature-controlled through-loading area. Generally, it is taken as 2 / 3, and it can also be determined according to the actual situation of logistics operation.

[0057] (8) Determine that the leakage coefficient ε of the door seal of the temperature-controlled through-loading opening is 0.05.

[0058] (9) Measure and calculate the air flow velocity ω of the external air of the cold chain logistics cold storage entering the temperature-controlled through-loading area through the gap between the door seal and the refrigerated truck carriage in summer.

[0059] Use a digital tachometer to measure the air flow velocities at three positions along the height direction of the temperature-controlled through-loading opening of the cold chain logistics cold storage slightly above, slightly below, and take the average value to obtain the air flow velocity ω of the external air entering the temperature-controlled through-loading area through the door seal and the refrigerated truck carriage.

[0060] (10) Determine the daily operating time T of the temperature-controlled through-loading area.

[0061] (11) Calculate the daily door opening and ventilation times N of the temperature-controlled through-loading area of the cold chain logistics cold storage, and the calculation method is as follows:

[0062] Where: N is the daily door opening and ventilation times of the temperature-controlled through-loading area, with the unit of times / day;

[0063] 3600 is the conversion coefficient between hours and seconds;

[0064] n is the number of loading and unloading openings in the temperature-controlled corridor, in units of channels;

[0065] S is the area of a single loading and unloading opening in the temperature-controlled corridor, in units of ㎡;

[0066] θ is the intake coefficient of the neutral plane of the loading and unloading openings in the temperature-controlled corridor;

[0067] η is the synchronous operation coefficient of all loading and unloading openings in the temperature-controlled corridor;

[0068] ε is the leakage coefficient of the door seals of the loading and unloading openings in the temperature-controlled corridor;

[0069] ω is the air flow velocity of the external air in summer of the cold chain logistics cold storage entering the temperature-controlled corridor through the gap between the door seal and the refrigerated truck carriage, in units of m / s;

[0070] Τ is the working hours of the daily operation of the temperature-controlled corridor, in units of h;

[0071] ξ is the atmospheric pressure correction coefficient;

[0072] V is the net volume of the temperature-controlled corridor, in units of m3.

[0073] In addition, it should be noted that for the specific embodiments described in this specification, the shapes, names of the components, etc. can be different. The above content described in this specification is only an example of the structure of the present invention. Any equivalent changes or simple changes made according to the structure, features and principles described in the inventive concept of this patent are included in the protection scope of this patent.

Claims

1. A method for calculating the number of door openings and ventilation times per day in a temperature-controlled cold storage in a cold chain logistics warehouse, characterized in that: The following steps are involved: (1) Determine the geographical location of the cold chain logistics cold storage project and the summer outdoor atmospheric pressure at the location of the cold chain logistics cold storage project; (2) Calculate the atmospheric pressure correction factor for the number of door openings per day for ventilation in the temperature-controlled hallway; (3) Determine the target range of the temperature-controlled corridor of the cold chain logistics cold storage, and determine the number of loading and unloading openings in the temperature-controlled corridor according to the architectural drawings; (4) Determine the boundary range of the temperature-controlled through-hole loading and unloading openings of the cold chain logistics cold storage, determine the boundary size of a loading and unloading opening according to the architectural drawings, and calculate the area of ​​a loading and unloading opening; (5) Determine the boundary range of the temperature-controlled hall of the cold chain logistics cold storage, determine the boundary size of the temperature-controlled hall according to the architectural drawings, and calculate the net volume of the temperature-controlled hall; (6) Determine the air intake coefficient of the temperature-controlled through-hole loading and unloading opening; (7) Determine the concurrent operation coefficients of all loading and unloading ports in the temperature-controlled tunnel; (8) Determine the leakage coefficient of the temperature-controlled through-hole loading and unloading door seal; (9) Determine the airflow velocity of the cold chain logistics cold storage in summer when the outside air enters the temperature-controlled hall through the gap between the door seal and the refrigerated truck compartment; (10) Determine the daily operating hours of the temperature-controlled hall; (11) Calculate the number of times the door is opened daily for ventilation in the temperature-controlled hall of the cold chain logistics cold storage.

2. The calculation method according to claim 1, characterized in that: In step (1), the summer outdoor atmospheric pressure at the location of the cold chain logistics cold storage project is determined by checking the "Design Code for Heating, Ventilation and Air Conditioning of Industrial Buildings" GB50019-2015.

3. The calculation method according to claim 2, characterized in that: In step (2), the calculation method of the atmospheric pressure correction coefficient ξ is as follows: Ρ is the summer outdoor atmospheric pressure at the location of the cold chain logistics cold storage project.

4. The calculation method according to claim 1, characterized in that: In step (4), the area S of a loading and unloading opening is calculated as follows: S=W1×H1; W1 is the width of the temperature-controlled through-hole loading and unloading opening; H1 is the height of the temperature-controlled through-hole loading and unloading opening.

5. The calculation method according to claim 1, characterized in that: In step (5), the calculation method of the net volume V of the temperature-controlled hall is as follows: V=L×W2×H2; L is the net length of the temperature-controlled hall of the cold chain logistics cold storage; W2 is the net width of the temperature-controlled hall of the cold chain logistics cold storage; H2 is the net height of the temperature-controlled hall of the cold chain logistics cold storage.

6. The calculation method according to claim 1, characterized in that: In step (6), it is assumed that there is an ideal plane in the vertical direction of the loading and unloading port where the pressure inside and outside the warehouse is equal. This plane is the neutral plane, and the air intake coefficient θ of the neutral plane of the temperature-controlled through-hall loading and unloading port is determined to be 0.

5.

7. The calculation method according to claim 1, characterized in that: In step (8), the leakage coefficient ε of the temperature-controlled through-hall loading and unloading port door seal is determined to be 0.

05.

8. The calculation method according to claim 4, characterized in that: In step (9), a digital speedometer is used to measure the height direction of the temperature-controlled loading and unloading port of the cold chain cold storage. Upper The airflow speed at the three lower points is averaged to obtain the airflow speed of the cold chain logistics cold storage in summer when the external air passes through the door seal and the refrigerated truck compartment into the temperature-controlled hall.

9. The calculation method according to claim 1, characterized in that: In step (11), the calculation method of the number of door opening ventilation times N per day is as follows: Where: N is the number of times the temperature-controlled hall is opened for ventilation every day; n is the number of loading and unloading ports in the temperature-controlled hall; S is the area of ​​a loading and unloading opening in the temperature-controlled hall; θ is the air intake coefficient of the neutral surface of the temperature-controlled through-hole loading and unloading port; η is the concurrent operation coefficient of all loading and unloading ports in the temperature-controlled passage; ε is the leakage coefficient of the temperature-controlled through-hall loading and unloading port door seal; ω is the airflow velocity of the cold chain logistics cold storage in summer when the outside air enters the temperature-controlled hall through the gap between the door seal and the refrigerated truck compartment; Τ is the daily operating hours of the temperature-controlled hall; ξ is the atmospheric pressure correction factor; V is the net volume of the temperature-controlled hall.

10. The calculation method according to claim 1 or 9, characterized in that: The aforementioned concurrent operation coefficient is taken as 2 / 3.

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