Research On Energy Saving Of The Terminal In Cold Area Based On The Diaphragm Thermal Effect

The modern terminals tend to pursue individualization,openness,permeability and large space,but the trend led to a surge in energy consumption of terminals.Especially,the phenomenon is very serious in cold areas.For this reason,it is necessary that studying the influence factors of terminals energy consumption in cold areas to provide a theoretical basis for optimizing energy-saving effect of terminals in cold areas.According to the characteristic of indoor and outdoor thermal environment under the influence of the external building envelope of terminals,the thesis comes up with coefficient of the diaphragm thermal effect based on the influence of the outdoor flow field on the heat-transfer effects of building envelope,and based on the calculation of the coefficient,the thesis explores the influence laws of external openings of buildings and openings determined by building orientation and prevailing wind direction in winter on energy consumption of large space buildings.Through the system analysis of the heat transfer process of the terminal’s thermal environment,the thesis constructs the equilibrium equation of building indoor thermal environment,and the thesis takes T2 terminal of Harbin Taiping International Airport as an example,combines with the climate characteristics of Harbin and the overall layout and openings of the T2 terminal,applies FLUENT to simulate the indoor and outdoor thermal environment of the terminal,analysis the influence of building layout and opening condition on the building diaphragm thermal effect.,compares the coefficient of the diaphragm thermal effect under different working conditions.Under laboratory conditions,the thesis carries out the simulation experiment of the diaphragm thermal effect,studies the influence of opening layout and the relative relationship between the opening and wind direction on the diaphragm thermal effect.The thesis verifies the coefficient of the diaphragm thermal effect when the different openings are arranged.Based on the analysis of Terminal’s indoor and outdoor heat exchange process in the cold regions,the impact of the external building envelope on building energy consumption is significant,especially the opening area,the opening position and the wind direction of indoor and outdoor.The diaphragm thermal effect coefficient of the opening in the leeward side wall is 672.49;the diaphragm thermal effect coefficient are 899.62 when T2 terminal windward side openings are fully open,however,the diaphragm is 227.13 when half openings are open.The diaphragm thermal effect coefficient generated by the openings in the region of wind vortex is up to 697.86,and it is 2.16 times of other regions.Under the same background of wind speed,the energy consumption of Y shaped radiation type increases by 4.2% with symmetric radiation type terminal compared,but the symmetric umbrella radiation type is3.1% and the non symmetrical terminal umbel radiant is 1.6%.According to the result of the simulation experiment,the openings in the leeward side wall and other positions have the similar influence on the diaphragm thermal effect when the exterior flow field is stable,but the difference of the diaphragm thermal effect generated by openings in the leeward side wall is larger,it can reach 3.63 times.