Influence of Ambient Temperature on TVOC Released from Polyurethane Athletics Track †
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Main Instrument
- 0.1 m3 environmental chamber: QP 21-H4L100 small TVOC release environmental chamber produced by Shanghai Qinpei Environmental Protection Technology Co., Ltd. (Shanghai, China) The environmental chamber release studio size is 400.00 × 500.00 × 500.00 mm (width × depth × height), which uses a stainless steel inner wall, fully enclosed chamber, high-density insulation layer, self-contained temperature, humidity control device and an air purification and cycle intelligent control system;
- TVOC gas detector: ppbRAE 3000 TVOC gas detector produced by American RAE Company. Using RAE’s third-generation Photo Ionization Detector, the ionization potential of the UV lamp source is 10.6 eV, the detection resolution is 1 ppb (part per billion, one billionth), and the detection accuracy is 10–2000 ppm (part per million) of isobutylene calibration point ±3.00%, detection range 1 ppb–10000 ppm;
- Experimental reagents: deionized water (conductivity is 0.1 μS·cm−1, Shanghai HUSHI) and alkaline cleaning agent (pH ≥ 7.5, Shanghai HUSHI).
2.3. Experimental Method
2.3.1. Sample Pretreatment
2.3.2. Instrument Pretreatment
2.3.3. Release the Athletics Track TVOC by the Environmental Chamber
2.3.4. Measure the TVOC Mass Concentration Released from the PU Athletics Track
3. Results
4. Discussion
- As the temperature increases, the TVOC mass concentration release from PU athletics track gradually increases. At the same time, both the increase rate and the decrease rate increase with the increase in temperature during the increase or decrease in the TVOC mass concentration of the PU plastic track.According to the Antoine equationIn the Antoine equation, the A, B and C values of different substances are constant. As the temperature increases, the vapor pressure of VOCs also increases, which promotes VOCs’ in PU athletics track release to the air, resulting in an increase in the TVOC mass concentration.At the same time, the diffusion coefficient of VOCs in the PU athletics track also directly affects the release of PU athletics track VOCs. According to the Arrhenius equationThe increase in temperature in the environmental chamber leads to an increase in the thermal motion of VOCs, and the number of activated molecules involved in the reaction is significantly increased, resulting in a significant increase in the reaction rate. Thermodynamic temperature is the exponential term of the Arrhenius equation, resulting in a higher temperature the more the reaction rate increases. Therefore, as the temperature increases, either the increase rate or decrease rate increase in the process of the TVOC mass concentration released from the PU athletics track increasing or decreasing;
- The release of TVOC from athletics track changed significantly over time in the early stages of testing, and it showed a rapid increase first and, after reaching the maximum mass concentration, it fell at a certain speed and eventually became balanced. In general, the release process of TVOC from PU athletics track can be divided into three phases: rapid release period, slow release period and stable release period;
- As the temperature changes, the duration of the three phases of TVOC released from PU athletics track is obviously inconsistent. As the temperature rises, the TVOC mass concentration emission from athletics track will reach the maximum faster, and the period of equilibrium will be longer. This indicates that the increase in temperature will directly lead to the rapid release period being significantly shortened, and the slow release period being significantly prolonged;
- At the end of the slow release period, the TVOC released from PU athletics track will reach a dynamic balance. That is, the TVOC released from PU athletics track is substantially equal to the TVOC mass concentration taken by the pure air cycle. The lower the temperature, the faster the TVOC released from PU athletics track will reaches dynamic balance, and the shorter the time needed to reach the stable release period;
- The influence of ambient temperature on TVOC released from PU athletics track is very significant. The maximum mass concentration and 24 h value of TVOC steadily increased when ambient temperature increased. This is due to the fact that, during the process of ambient temperature increasing, the thermal motion of VOCs in the PU athletics track is gradually enhanced, while the adsorption capability and adsorption capacity of the VOCs in the PU athletics track are gradually reduced, causing a large release of VOCs in the PU athletics track and an increase the TVOC mass concentration released from PU athletics track.
5. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
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Group No. | Temperature (°C) | Relative Humidity (%RH) | Air Exchange Rate (Times·h−1) |
---|---|---|---|
1 | 23 | 55 | 1.0 |
2 | 30 | 55 | 1.0 |
3 | 35 | 55 | 1.0 |
4 | 40 | 25 | 1.0 |
5 | 45 | 25 | 1.0 |
6 | 50 | 25 | 1.0 |
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Liu, G.; Zheng, W.; Wang, H. Influence of Ambient Temperature on TVOC Released from Polyurethane Athletics Track. Proceedings 2020, 49, 1. https://doi.org/10.3390/proceedings2020049001
Liu G, Zheng W, Wang H. Influence of Ambient Temperature on TVOC Released from Polyurethane Athletics Track. Proceedings. 2020; 49(1):1. https://doi.org/10.3390/proceedings2020049001
Chicago/Turabian StyleLiu, Gan, Weitao Zheng, and Hong Wang. 2020. "Influence of Ambient Temperature on TVOC Released from Polyurethane Athletics Track" Proceedings 49, no. 1: 1. https://doi.org/10.3390/proceedings2020049001