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The research and application of spray cooling technology in Shanghai Expo.

Author(s) : HUANG C., YE D., ZHAO H., et al.

Type of article: Article

Summary

In this paper, the weather data (issued by the China Meteorological Administration) of typical year and highest temperature typical year are adopted to predict and analyze the effect of applying spray cooling technology to 2010 World Expo in Shanghai. The experimental results from Japan are considered as the grounds of argument for effectiveness of spray cooling, namely when temperature is above 30 °C and relative humidity is below 70%, the decrease of 1-2 °C can be gained after high-pressure spray cooling. By analyzing the weather data of 1840 h during the Expo, the results show that, for typical year and highest temperature typical year, the effective time for spray cooling are predicted to be 173-426 h. The meteorological monitoring data during the Expo show that the actual effective time for spray cooling are 387 h. The actual climatic characteristics in 2010 are extremely close to the adopted weather data of highest temperature typical year. Meanwhile, the WBGT index during the Expo is predicted and analyzed in this paper. After applying the spray cooling technology to a residential pavilion in Shanghai, the cooling effect and pressure and flow characteristics of spraying system are demonstrated in this paper. Conclusion can be drawn from the experimental results that when ambient temperature is 35 °C and relative humidity is about 45%, the air temperature of each measuring point can be reduced by 5-7 °C at most. The relative humidity in most regions is below 70%. Furthermore, the spray cooling efficiency of spraying area can be up to 65% and the partial spray cooling efficiency can reach 80% at most. The COP of high-pressure spray system is over 30 when water pressure is greater than 5.5 Mpa. Besides, the WBGT of each measuring point in spraying area can be reduced by 3.5-5.2 0C. In July 2010, the two experimental results of spray cooling in the Expo Axis show that when ambient temperature is 34-40 °C and relative humidity is 32-55%, the air temperature can be reduced by 6-12 °C at most within the range of 1 m from spray column, and by 1.5-4 °C on average within the range of 3 m, by 0.5-1.5 °C at least within the range of 7 m. The research and experiments indicate that the spray cooling technology applied during Shanghai Expo is very effective.

Details

  • Original title: The research and application of spray cooling technology in Shanghai Expo.
  • Record ID : 30006252
  • Languages: English
  • Source: Applied Thermal Engineering - vol. 31 - n. 17-18
  • Publication date: 2011/12
  • DOI: http://dx.doi.org/10.1016/j.applthermaleng.2011.03.039

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