SIMULATION OF A NON-STATIONARY THERMAL MODE OF PREMISE WITH THE WOOD ENCLOSING STRUCTURES

Abstract

A non-stationary approach to the calculation of periodic thermal regimes of low-rise buildings with enclosing structures made of wooden beams equipped with double-glazed windows is considered. The application of the proposed method allows to determine the non-stationary thermal load of the air conditioning system for this type of house, as well as the required compensating capacities during the day. The conditions of applicability of plane-layered thermophysical calculation schemes in the presence of spatially inhomogeneous heating are analyzed. A refinement of the procedure for averaging convective heat transfer coefficients for vertical walls by periodic temperature fluctuations is carried out. An algorithm for calculating the periodic thermal regime based on the representation of time dependencies in the form of a Fourier series is proposed. The role of solar radiation flow through double-glazed windows in the heat exchange and energy efficiency of a wooden house is shown. The proposed mathematical model of room heat exchange takes into account the effects of the delay in the propagation of the temperature field in the walls when the ambient temperature changes and the dynamic change in heat flux from light flows outside and inside the room. It is determined that protection from direct sunlight entering the room through the window opening allows reducing peak air conditioning costs in the summer by a third for peak air conditioning modes.