Method for measuring deposition rate of ozone in actual vehicle cabin in interior trim and human body surface

Abstract

The invention belongs to the technical field of in-vehicle environment inspection, and particularly relates to a method for measuring the deposition rate of ozone in an actual vehicle cabin in an interior trim and a human body surface. According to the method, the physical model with the ozone concentration changing along with time is established, and the ozone concentration detection of the actual internal and external environments of the vehicle cabin is combined, so that the accurate calculation of different surface ozone deposition rates is realized. Different experimental steps are designed for two core objects, namely the cabin interior material and the human skin, and the deposition rates of ozone on the surface of the cabin interior material and the surface of the human skin are obtained through data fitting. The method is simple in experimental operation and short in measurement time, not only can accurately represent the dynamic behavior of the ozone in the vehicle cabin and provide a scientific basis for optimizing materials in the vehicle, but also can quantify the interaction between the human skin surface and the ozone and provide support for health risk assessment and formulation of protective measures.

Description

Technical Field

[0001] The 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. Background Art

[0002] With the popularity of modern cars and the increasing attention to the air quality in cars, the problem of air pollution in car cabins has attracted extensive research by scholars. Ozone, as one of the common air pollutants in car cabins, poses a threat to human health due to its strong oxidizing and irritating properties, especially in a closed environment. The accumulation of ozone concentration can easily cause a series of respiratory diseases, allergic reactions and other health problems. Therefore, understanding the distribution and deposition characteristics of ozone in the cabin has become an important topic for studying the air quality in cars and taking effective air treatment measures.

[0003] As a relatively closed environment, the cabin is filled with various surfaces, such as seats, dashboards, roof linings, and human skin. When these surfaces come into contact with ozone, complex chemical reactions will occur, causing ozone to decompose or deposit and generate 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 assessment, 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 surfaces inside the car, resulting in 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 proposed 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] Objective of the present invention: The objective of the present invention is to provide a simple, rapid, accurate and effective method for simultaneously measuring the deposition rate of ozone on interior decoration and human body surface in an actual vehicle cabin.

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

[0007] (1) Establish a physical model of the change of ozone O3 concentration in the cabin over time:

[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 ventilation 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 deposition rate of ozone on the interior surface of the vehicle cabin, ppb·m / h;

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

[0011] (3) Turn on two O3 measuring instruments at the same time 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 in the vehicle and outside the vehicle in real time, and perform linear fitting on the decay data of the CO2 concentration in the vehicle to obtain the ventilation rate N.

[0014] (6) Using formula (1), the data of the change of O3 concentration in the cabin over time are fitted. When there is no artificial condition, E 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 artificial conditions in the cabin, 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 variation in the cabin over time, 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 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 vehicle 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, providing a scientific basis for optimizing in-vehicle materials, but also quantify the interaction between the human skin surface and ozone, providing support for health risk assessment and the formulation of protective measures. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a 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 surface of the interior decoration of the vehicle cabin according to the present invention;

[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 surface in an actual vehicle cabin, which is described in detail in conjunction with 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 car respectively. Under the condition that there is no manpower in the cabin, the person 3 leaves the cabin, remotely turns on the CO2 small gas bottle 4 placed in the car, and turns on the CO2 meter 4 and O3 meter 5 inside and outside the car at the same time. The experiment is stopped after 20 minutes to obtain the cabin ventilation rate N and the ozone deposition rate E on the surface of the cabin interior material 2 s ; When there is an artificial person 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 deposition rate E of ozone 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 comprises the following steps:

[0025] (1) Establish a physical model of the change of ozone O3 concentration in the cabin over time:

[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 ventilation 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 deposition rate of ozone on the interior surface of the vehicle cabin, ppb·m / h;

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

[0029] (3) Turn on two O3 measuring instruments at the same time 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 in the vehicle and outside the vehicle in real time. Perform a linear fit on the CO2 concentration decay data in the vehicle to obtain N of 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 data of the change of O3 concentration in the cabin over time are fitted. When there is no artificial condition, E 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 artificial conditions in the cabin, 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 decoration and human body surface in an actual vehicle cabin, characterized in that: The steps include: (1) Establish a physical model of the change of ozone O3 concentration in the cabin over time: 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 ventilation 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 deposition rate of ozone on the interior surface of the vehicle cabin, ppb·m / h; (2) Set the recording time of two O3 measuring instruments to be the same, and test the instruments to ensure that the readings are consistent under the same environmental conditions, and place them inside and outside the vehicle respectively; (3) Turn on two O3 measuring instruments at the same time 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 in the vehicle and outside the vehicle in real time, and perform linear fitting on the decay data of the CO2 concentration in the vehicle to obtain the ventilation rate N. (6) Using formula (1), the data of the change of O3 concentration in the cabin over time are fitted. When there is no artificial condition, E 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 artificial conditions in the cabin, 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 variation in the cabin over time, further obtain the parameter E h , which is the deposition rate of O3 on the human body surface.

Images