Study On Thermal Characteristics Of Multilayer Membrane Exhaust Air Insulation Window

Building energy consumption accounts for a relatively high proportion of global energy consumption.With the rapid development of the economy,people have put forward higher requirements for building comfort.This makes the impact of HVAC systems on building energy consumption more significant,so it is relevant Researchers think about how to effectively reduce HVAC energy consumption.Exterior windows are an important part of building maintenance structures,and they are a weak link in the envelope structure.In order to enhance the insulation capacity of exterior windows,this paper proposes a The multi-layer membrane exhaust heat insulation window is composed of a film,two layers of glass,glass and membrane,and a cavity formed by the membrane and membrane.The window utilizes the indoor and outdoor air pressure difference formed by the central air-conditioning system during use and the low-grade energy of the air-conditioning exhaust,and the airflow is folded back several times in the window due to the presence of the film,so it will more effectively enter the building interior through the outer window The heat or cold is taken away,so that the temperature of the window surface on the indoor side is closer to the indoor temperature,which can improve the thermal comfort of indoor personnel,and can reduce the operating load of air conditioning formed by the external windows of the building to a certain extent Energy saving effect of wind heat recovery.In this paper,an experimental platform for measuring the thermal characteristics of multilayer membrane exhaust heat insulation windows is built.The feasibility of simplifying the window from a three-dimensional model to a two-dimensional model is studied using experimental data collected under unsteady conditions in winter and summer.Because of the high cost of using experiments to study the thermal characteristics of windows,it is difficult to control the stability of the experimental environment for a long time and many other inconvenience factors,and numerical simulation has the advantages of low research cost and high parameter controllability,but the accuracy of numerical simulation requires It has been verified,so this article uses experimental data to verify the accuracy of the corresponding temperature point data of the window obtained by non-steady-state numerical simulation.The results show that the maximum error of the simulation results under summer conditions is less than 4.7%,and the maximum error of the simulation results under winter conditions Less than 10.7%,because this article does not focus on the instantaneous thermal characteristics of windows,non-steady-state simulation is not convenient to obtain window speed and temperature cloud map directly compared to steady-state simulation,and there are short boards with large calculations,etc.Therefore,this paper uses a case to explore the difference between the results obtained by the unsteady state simulation and the steady state simulation study of the same object.The calculation results show that the results obtained by the unsteady state simulation and the steady state simulation are consistent.Finally,the steady state simulation study is used The influence of the change of the window parameters on the thermal characteristics.The research results show that: the thickness of the cavity of the window,the number of layers of the film,and the amount of air intake all have a great influence on the thermal characteristics of the window.