A method for measuring ozone deposition rate on interior and human body surfaces in actual vehicle cabins

Abstract

The present invention belongs to the technical field of in-vehicle environment inspection, and in particular relates to a method for measuring the deposition rate of ozone on interior decoration and human body surface in an actual vehicle cabin. The present invention realizes the accurate calculation of ozone deposition rate on different surfaces by establishing a physical model of ozone concentration changing with time, combined with the ozone concentration detection of the actual environment inside and outside the cabin. Different experimental steps are designed for the two core objects of vehicle cabin interior materials and human skin, and the deposition rates of ozone on the surface of vehicle cabin interior materials and human skin are obtained respectively through data fitting. The experimental operation of the present invention is simple and the measurement time is short. It can not only accurately characterize the dynamic behavior of ozone in the cabin, provide a scientific basis for optimizing vehicle interior materials, but also quantify the interaction between the human skin surface and ozone, and provide support for health risk assessment and the formulation of protective measures.

Description

Technical Field

[0001] The present invention belongs to the technical field of in-vehicle environment inspection, and in particular relates to a method for measuring the deposition rate of ozone on interior decoration and human body surfaces in an actual vehicle cabin. Background Art

[0002] With the increasing popularity of modern cars and growing concern about in-car air quality, the issue of in-car air pollution has attracted extensive research. Ozone, a common air pollutant in vehicle cabins, poses a threat to human health due to its strong oxidizing and irritating properties. Accumulated ozone concentrations in enclosed environments can easily lead to a range of health issues, including respiratory illnesses and allergic reactions. Therefore, understanding the distribution and deposition characteristics of ozone in vehicle cabins has become a crucial topic in researching in-car air quality and implementing effective air quality control measures.

[0003] As a relatively closed environment, the vehicle cabin is filled with a variety of surfaces, such as seats, dashboards, roof linings, and human skin. When these surfaces come into contact with ozone, complex chemical reactions occur, causing ozone to decompose or deposit, and the generation of new pollutants, thereby changing the concentration distribution and dynamic behavior of ozone and other pollutants in the cabin air. This "surface deposition" phenomenon not only affects the accuracy of cabin air quality assessments, but also directly determines the risk level of passengers' exposure to ozone. However, existing ozone measurement methods mostly focus on monitoring ozone concentrations in the air, while ignoring the deposition rate of ozone on different vehicle interior surfaces. This leads to an insufficient overall assessment of ozone behavior in the cabin, which in turn limits the progress of scientific research and design optimization.

[0004] This patent is based on the above background. It designs a method that can measure the deposition rate of ozone on the surface of interior materials and human body in the actual cabin environment, filling the gap in the existing technology. It can provide important data support for optimizing the selection of cabin interior materials, studying the deposition patterns of air pollutants in the cabin and reducing human exposure risks, and promote the development of research related to cabin environmental health. Summary of the Invention

[0005] The purpose of the present invention is to provide a simple, rapid, accurate and effective method for simultaneously measuring the deposition rate of ozone on the interior and human body surfaces in an actual vehicle cabin.

[0006] To achieve the above objectives, the following technical solutions are provided: A method for measuring the deposition rate of ozone on the interior and human body surfaces in an actual vehicle cabin, which is designed as follows:

[0007] (1) Establish a physical model of the time-varying ozone concentration in the cabin:

[0008]

[0009] In this model: C in _ O3 is the ozone concentration in the cabin, ppb; C out _ O3 is the ozone concentration outside the vehicle, ppb; N is the air exchange rate between the cabin and the outside, h -1 ; A h is the exposed skin surface area of ​​the human body, m 2 ; A s is the surface area of ​​the cabin interior material, m 2 ; V is the passenger car cabin volume, m 3 ;E h is the deposition rate of ozone on the human body surface, ppb·m / h; E s is the ozone deposition rate on the interior surfaces of the vehicle cabin, ppb·m / h;

[0010] (2) Set the recording time of two O3 meters to the same, and test the instruments to ensure that the readings are consistent under the same environmental conditions as much as possible, and place them inside and outside the vehicle respectively;

[0011] (3) Simultaneously turn on two O3 measuring instruments to record the O3 concentration inside and outside the vehicle in real time. Keep the doors and windows of the vehicle closed during the experiment.

[0012] (4) Set the cabin to an unmanned condition, observe the readings on the O3 meters inside and outside the vehicle, stop the experiment after 20 minutes, and export the concentration data on the O3 meters inside and outside the vehicle;

[0013] (5) Use CO2 as a tracer gas to measure the cabin ventilation rate. Remotely open the CO2 cylinder placed in the vehicle and close it when the CO2 concentration in the vehicle rises to 5000±500ppm. Use a CO2 meter to record the CO2 concentration inside and outside the vehicle in real time. Perform a linear fit on the decay data of the CO2 concentration inside the vehicle to obtain the ventilation rate N.

[0014] (6) Using formula (1), the time-varying data of O3 concentration in the cabin are fitted. When there is no artificial h Taking 0, the unknown parameter E in the formula can be fitted s , which is the deposition rate of O3 on the surface of the cabin interior;

[0015] (7) Further set up the cabin to have artificial conditions, observe the readings on the O3 meters inside and outside the vehicle, stop the experiment after 20 minutes, and export the concentration data on the O3 meters inside and outside the vehicle;

[0016] (8) Using the N and E measured above s , and combined with formula (1) to fit the data of O3 concentration changing with time in the cabin, further obtain the parameter Eh , which is the deposition rate of O3 on the human body surface.

[0017] Features and effects of the present invention:

[0018] The present invention belongs to the technical field of in-vehicle environment inspection, and in particular relates to a method for measuring the deposition rate of ozone on interior decoration and human body surface in an actual vehicle cabin. The present invention realizes the accurate calculation of ozone deposition rate on different surfaces by establishing a physical model of ozone concentration changing with time, combined with the ozone concentration detection of the actual environment inside and outside the cabin. Different experimental steps are designed for the two core objects of vehicle cabin interior materials and human skin, and the deposition rates of ozone on the surface of vehicle cabin interior materials and human skin are obtained respectively through data fitting. The experimental operation of the present invention is simple and the measurement time is short. It can not only accurately characterize the dynamic behavior of ozone in the cabin, provide a scientific basis for optimizing vehicle interior materials, but also quantify the interaction between the human skin surface and ozone, and provide support for health risk assessment and the formulation of protective measures. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the experimental system of the present invention;

[0020] Figure 2 This is a schematic diagram of the method for determining the deposition rate of O3 on the interior surface of a vehicle cabin;

[0021] Figure 3 This is a schematic diagram of the present invention for determining the deposition rate of O3 on the human body surface. DETAILED DESCRIPTION

[0022] The present invention proposes a method for measuring the deposition rate of ozone on the interior and human body surfaces in an actual vehicle cabin, which is described in detail with reference to the accompanying drawings and embodiments as follows:

[0023] The experimental system diagram of the present invention is as follows Figure 1 As shown, the actual environment 1 refers to the cabin environment, 2 refers to the cabin interior material, and the O3 meter 5 and CO2 meter 6 are placed inside and outside the vehicle, respectively. With no personnel in the cabin, person 3 leaves the cabin and remotely activates the CO2 cylinder 4 placed inside the vehicle. The CO2 meter 4 and O3 meter 5 inside and outside the vehicle are also activated. The experiment is stopped after 20 minutes to obtain the cabin air exchange rate N and the ozone deposition rate E on the surface of the cabin interior material 2. s ; Under the condition of human presence in the cabin, person 3 enters the cabin and turns on the O3 measuring instrument 5 inside and outside the car. The experiment is stopped after 20 minutes to obtain the ozone deposition rate E on the skin surface of person 3 h .

[0024] The method of the actual ozone deposition rate on the interior and human body surface in the vehicle cabin of this embodiment includes the following steps:

[0025] (1) Establish a physical model of the time-varying ozone concentration in the cabin:

[0026]

[0027] In this model: C in _ O3 is the ozone concentration in the cabin, ppb; C out _ O3 is the ozone concentration outside the vehicle, ppb; N is the air exchange rate between the cabin and the outside, h -1 ; A h is the exposed skin surface area of ​​the human body, m 2 ; A s is the surface area of ​​the cabin interior material, m 2 ; V is the passenger car cabin volume, m 3 ;E h is the deposition rate of ozone on the human body surface, ppb·m / h; E s is the ozone deposition rate on the interior surfaces of the vehicle cabin, ppb·m / h;

[0028] (2) Set the recording time of two O3 meters to the same, and test the instruments to ensure that the readings are consistent under the same environmental conditions as much as possible, and place them inside and outside the vehicle respectively;

[0029] (3) Simultaneously turn on two O3 measuring instruments to record the O3 concentration inside and outside the vehicle in real time. Keep the doors and windows of the vehicle closed during the experiment.

[0030] (4) Set the cabin to an unmanned condition, observe the readings on the O3 meters inside and outside the vehicle, stop the experiment after 20 minutes, and export the concentration data on the O3 meters inside and outside the vehicle;

[0031] (5) Use CO2 as a tracer gas to measure the cabin ventilation rate. Remotely open the CO2 cylinder placed in the vehicle and close it when the CO2 concentration in the vehicle rises to 5000±500ppm. Use a CO2 meter to record the CO2 concentration inside and outside the vehicle in real time. Perform a linear fit on the CO2 concentration decay data inside the vehicle and obtain N = 4.2h -1 The interior surface area of ​​the cabin is 10.18m 2 , cabin volume 2.9m 3 ;

[0032] (6) Using formula (1), the time-varying data of O3 concentration in the cabin are fitted. When there is no artificial h Taking 0, we can get the deposition rate E of O3 on the surface of the car interior s 39.75ppb·m / h;

[0033] (7) Further set up the cabin to have artificial conditions, observe the readings on the O3 meters inside and outside the vehicle, stop the experiment after 20 minutes, and export the concentration data on the O3 meters inside and outside the vehicle;

[0034] (8) Using the N and E measured above s The exposed surface area of ​​human skin is 0.459m 2 , combined with formula (1), the O3 concentration in the cabin is fitted with the time-varying data to obtain the O3 deposition rate E on the human body surface h It is 461.22ppb·m / h.

Claims

1. A method for measuring the deposition rate of ozone on interior and human body surfaces in an actual vehicle cabin, characterized in that: The steps include: (1) Establish a physical model of the time-varying ozone concentration in the cabin: In this model: C in_O3 is the ozone concentration in the cabin, ppb; C out_O3 is the ozone concentration outside the vehicle, ppb; N is the air exchange rate between the cabin and the outside, h -1 ; A h is the exposed skin surface area of ​​the human body, m 2 ; A s is the surface area of ​​the cabin interior material, m 2 ; V is the passenger car cabin volume, m 3 ; E h is the deposition rate of ozone on the human body surface, ppb·m / h; E s is the ozone deposition rate on the interior surfaces of the vehicle cabin, ppb·m / h; (2) Set the recording time of two O3 meters to the same, and test the instruments to ensure that the readings are consistent under the same environmental conditions as much as possible, and place them inside and outside the vehicle respectively; (3) Simultaneously turn on two O3 measuring instruments to record the O3 concentration inside and outside the vehicle in real time. Keep the doors and windows of the vehicle closed during the experiment. (4) Set the cabin to an unmanned condition, observe the readings on the O3 meters inside and outside the vehicle, stop the experiment after 20 minutes, and export the concentration data on the O3 meters inside and outside the vehicle; (5) Use CO2 as a tracer gas to measure the cabin ventilation rate. Remotely open the CO2 cylinder placed in the vehicle and close it when the CO2 concentration in the vehicle rises to 5000±500ppm. Use a CO2 meter to record the CO2 concentration inside and outside the vehicle in real time. Perform a linear fit on the decay data of the CO2 concentration inside the vehicle to obtain the ventilation rate N. (6) Using formula (1), the time-varying data of O3 concentration in the cabin are fitted. When there is no artificial h Taking 0, the unknown parameter E in the formula can be fitted s , which is the deposition rate of O3 on the surface of the cabin interior; (7) Further set up the cabin to have artificial conditions, observe the readings on the O3 meters inside and outside the vehicle, stop the experiment after 20 minutes, and export the concentration data on the O3 meters inside and outside the vehicle; (8) Using the N and E measured above s , and combined with formula (1) to fit the data of O3 concentration changing with time in the cabin, further obtain the parameter E h , which is the deposition rate of O3 on the human body surface.

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