The Calculation and Distribution of Degree Days in Shaanxi Province

Abstract:

It is widely accepted around the world that degree days should act as the measurement of HVAC energy in a given place. This paper makes use of the temperature data from 1985 to 2004 from 96 meteorological stations in Shaanxi Province. Based on the daily average temperature in some cities, counties and districts in Shaanxi, we work out the degree days. We divide different zones according to the normalized degree days from 1995 to 2004. In this paper, we analyze the distribution of degree days in Shaanxi, the changes in every decade, and the monthly distribution of degree days in Yulin, Yan’an, Xi’an, Hanzhong, as well as the changes of value in 20 years in Xi’an. At last, we figure out that Shaanxi has spread out its terrain in two climate zones: one is the cold zone; the other is the hot summer and cold winter zone. The HDD18 value has declined continuously in 20 years, and it drops 194.8°C•d/10a every year; meantime the CDD26 has ascended by 28.1°C•d/10a. In all the cities, the HDD18 value is the highest in January, and lowest in July. In the past 20 years in Xi’an, HDD18 value has dropped by 25.0°C•d/a, and the CDD26 has risen by 5.2°C•d/a, which are the highest among those cities.

• Periodical: Advanced Materials Research (Volumes 512-515)
• Pages: 293-297
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.512-515.293
• Online since: May 2012
• Authors: Shu Yun Wu, Zeng Feng Yan, Shu Qian Jin, Yan Jun Li
• Keywords: Degree Days, Shaanxi Province, Space Distribution, Variation Trend

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