Research On Energy Consumption And Efficiency Of Office Building In Chongqing

The energy situation in the world and China is becoming urgency, and the energy consumed in buildings is gradually increasing, and the most of the energy is used for heating, ventilation and air-conditioning. To reduce this part, the energy-saving strategies must be formed and carried out on purpose. In order to achieve this object we could test and investigate the buildings and identify where the potential of energy-saving exists. The region and climate character can also influence the process of strategy making, so it is necessary to discuss the energy efficiency potential and strategy according to different climate and location. In a word, it is very necessary to research the level of energy consumption of the air-conditioning system in commercial buildings and energy efficiency technology in central air conditioning of commercial buildings. Based on testing and investigation, some office buildings in Chongqing were analyzed in this paper. The characters of office buildings are acquired by analyzing the testing data of the HVAC system and building envelop. The energy saving potential was found out and the characters of the tested buildings were obtained. Based on these conclusions and energy consumption simulation, energy saving strategy was summarized.The main contents include:â‘ The plans for testing were proposed, the thermal characteristics of the office building, including the average temperature within the building, heat transfer coefficient of the external walls and windows were measured. At the same time, the scheme of testing the operational data of the chiller and other components of the HVAC system was proposed too. The inlet and outlet temperature of the evaporator and condenser were tested and the flow of the chilled water was also tested. And the COP of the chiller was acquired by calculation;â‘¡A modeler has been established based on an office building in Chongqing by the simulation tool EnergyPlus. The annual energy consumption of the office buildings has been acquired by simulation. A smaller modeler was established and the cases on different design indoor temperature of the smaller modeler in winter and summer were analyzed, and its window wall ratio, lighting energy consumption, staff density, exterior shading type and the HVAC type have been changed and different results of energy consumption were acquired. The energy saving potential of the office building in Chongqing was found out by analyzing these simulation results. And the significance of each factor was identified by orthogonal tables and variance analysis. And the factors that affect the building energy consumption were ranged based on their significance;â‘¢The climate and region character of Chongqing was analyzed. Integrated with the investigation and simulation, the energy efficiecy strategies that include using night cooling, using exterior shading, using solar energy and implementing more reasonable energy managements for office building in Chongqing were proposed.