Research On The Feasibility And The Energy Saving Of Radiant Ceiling System And Natural Ventilation In A Residential Building

Currently,the building energy consumption amounts to nearly 30%of the total energy consumption in the world.Building energy conservation has become one of the means to save energy.Energy consumption surveys on office buildings and some public buildings in Xi'an show that heating and air conditioning systems consume about 25%～85%of the total energy used in various buildings.This reveals that optimizing air conditioning system design may help to reduce energy consumptions.Radiation air-conditioning is an energy-saving system which can produce more comfortable environment.However whether the design is feasible and energy-saving is determined by the building pattern and local climate,etc.Energy simulation program EnergyPlus was adopted to study energy consuming condition of a high-rise residential building in Xi'an,Chinese Typical Year Weather(CTYW) data was applied.Annual energy consumption were analyzed and compared when the building is installed with variable air volume(VAV) air-conditioning systems,fan coil system or radiant ceiling panel system with natural ventilation.It indicates that the latter one can obtain significant energy saving effect.The system is simulated in EnegryPlus for other 4 representative cities in northwest China.The results indicate that radiant ceiling panel system with natural ventilation is feasible for being used in residential building in northwest China and 19.2%～39.6%energy saving rate can be achieved.Therefore,it is a good choice of air-conditioning design for residential buildings in these area.Finally,the influence of exterior wall insulation on building energy conservation with radiant ceiling panel system and natural ventilation were analyzed.The results indicate that the air-conditioning system can save energy by 77.1%～85.4%,the building energy consumption is lowed by 54.2%～67.1%,when 30～50mm thick insulation layer is applied on exterior walls.The increase in insulation layer thickness will make the increase in the energy saving rate slow down,and even cause the energy saving rate to drop.The optimal insulation layer thickness should be determined according to local climate conditions and energy price,...