Office Building Energy Audit And Energy Saving Potential Research In Jiangsu Region

The shortage of energy is a bottleneck that estricts the socio-economic development, so it’s the mankind’s responsibility to make the use of energy rational. With the development of national economy, the building area in China is increasingly increasing and people’s demands on indoor environment are increasingly arise, as a result, the building energy consumption is also increasing. Statistics indicated that building energy consumption accounts for about 30% of the total consumption of energy at present in China. The energy consumption of public buildings is high due to the complexity of its functions, but there’s great potential in the energy-saving of public buildings, so it’s the focal point of energy-saving in the field of construction.This dissertation takes the government office buildings in the city of Yangzhou as research objects, among which eleven buildings were chosen to make energy auditings. The investigation in this research was conducted by means of questionnaire, site survey, conversations with the managers. Criteria used in the investigation included the basic information, the type, size and quantity of the equipments, and the energy consumption amount. Common characteristics of the office buildings in yangzhou are extracted from the statistics which show that air-conditioning accounted for 44% of total energy consumption, lighting accounts for approximately 17%, and the other electrical appliances represent 39%.Accoding to the auditing, the average electricity consumption of per unit area in these buildings is between 23 and 88 kWh/(m2 · a), average electricity consumption is 43kWh/(m2 · a). However, it is manifest that there exists remarkable difference in the energy consumption in different buildings and the potential for energy saving is great.In this paper, it makes energy audit for a typical government building and establishes geometric model with software DeST, analyses and makes comparison of the simulation results. According to the air-conditioning running time of the building, the whole year was divided into quarter heating, air conditioning quarter and the transition quarter, the characteristics of building load in different time were analysed. Response to these characteristics, some energy-saving suggestions to the building air-conditioning systems operation and management were given. At the same time, orthogonal test is also used to compare the causes of office buildings bearing.It analyzed the impacts of various elements of enclosed structure and the air-conditioning system have on building energy consumption by DeST, and investigated the energy-saving potential of the building. The annual energy consumption of different enclosed structures (exterior wall, exterior window and window-wall ratio) were simulated in this paper, and relevant reformation measures were proposed. The paper also simulated the annual energy consumption under different room temperatures, and the results indicated that effective energy saving can be reached by reducing the comfort level. Besides, the annual energy consumption under different fresh air modes was stimulated, and it can be concluded that compared with acquiring fresh air by opening the window, it’s more energy-efficient to start the fresh air equipment. The paper compared the energy consumption of the equipment which doesn’t have heat recovery with that having total heat recovery, and compared the annual energy consumption of the building under the intermittent operation of the air-conditioning system, employed CFD software to simulate the temperature field distributions of the room without air conditioner and the room under the intermittent operation of the unit, respectively. After the simulation, the paper made a comparison of the PMV and PPD indicators of the two kinds of rooms mentioned above. Through analysis it can be understood that the human’s comfort requirement can be satisfied and the effects of energy saving can be achieved under the intermittent operation of the unit. The regular system and the system with the feature of independent temperature and humidity control were also compared and analyzed in the paper. In short, this paper gave a brief introduction of the application of the ground-source heat pump and the application of lighting technology in the energy-saving building field, thus providing a reference to the energy-saving design of public buildings and operation management.The author hope this paper could provide some theoretical and engineering application basis in the energy 一 saving field of the public buildings in jiangsu district and even in the whole hot summer and cold winter area.