Climate Change Impact On Cooling And Heating Energy Consumption For Office Building In Tianjin

With the rapid urbanization of Tianjin, great changes have taken place in the city environment. Energy consumption has been growing for all kinds of building, particularly of public buildings. Huge energy consumption not only increase the environmental burden, but also related to the issue of energy security, especially in the negligible impact of extreme energy consumption on the security of the urban building cooling and heating systems, as well as energy conservation. Under the background of global warming, research in the relationship between climate change and building energy consumption under current and future climate scenarios, is prospected to provide a scientific basis for the relevant departments and government decision-making departments in the development of energy saving measures and long-term planning in the design of building energy saving system parameters.This paper selects office building as the research object. Based on the analysis of temperature, solar radiation, wind speed and other meteorological elements variation during the cooling period and heating period of Tianjin from1961to2010, TRNSYS software is used to simulate the gas consumption of refrigeration and heating for office building during the last30years. Using conventional statistical theory and multivariate regression, studies are performed on the refrigeration and heating energy consumption and the variation of their extremes, as well as for the climate change impacts on building energy consumption and extreme energy. Future climate elements are projected using Japanese MIROC3.2-H climate model, and the characteristics of office building cooling and heating energy consumption under future climate scenarios. The results showed that:(1) The average temperature, the maximum temperature and the minimum temperature during the cooling and heating periods showed a significant increasing trend from1961to2010. The mutation occurred in the1990s. Wet bulb temperature of the cooling and heating period also showed a significant increasing trend, while the average wind speed, solar radiation showed a significant downward trend. During the50years, Tianjin urban extreme heat events rose significantly, while the extreme low temperature events tended to decrease.(2) The main influencing factors are different for the office building gas consumption between the cooling and heating periods. Summer cooling daily gas consumption is mainly affected by the air temperature, and secondly by solar radiation. On monthly and yearly scales, summer cooling gas consumption is affected by the air temperature, the wet bulb temperature and solar radiation. In winter heating period, daily, monthly and yearly gas consumptions are the main affected by air temperature. What is different is that daily gas consumption is only affected by air temperature, despite the other meteorological factors, while monthly and yearly gas consumptions are also by solar radiation.(3) The days of extreme energy consumption during the cooling period increase insignificantly for office building. Daily extreme energy consumption is a result of the combined effect of humidity, temperature, solar radiation and other weather elements. The sensitivity hourly extreme energy consumption to meteorological elements differs time to time, relatively rapid impact comes from the wet bulb temperature and slow impact comes from radiation. The days of extreme heating energy consumption decrease insignificantly. Daily extreme energy consumption is a result of the combined effect of air temperature, wind speed, maximum and minimum temperatures, while on the hourly scale extreme energy consumption is not significantly correlated to weather elements.(4) Under future climate scenarios, office building heating gas consumption is projected to show a downward trend, and the cooling gas consumption is projected to show a significant increase trend. In both scenarios of low and medium-low emissions of green house gas, office building energy consumption per unit area will be reduced. Assumed that the office building area increase in the current rate in the next50years, office building heating and cooling energy consumption are expected to rise sharply, far exceeding the impact of climate change.