Szukana fraza: [Abstract = "The calculations with simplified methods were conducted in accordance with currently valid norm\: PN\-EN ISO 13370\:2008. Thermal performance of buildings. Heat transfer via the ground. Calculation methods. Comparative estimates concerning transient, 3D, heat flow were performed with computer software WUFI\?plus. The differences of heat exchange obtained using more exact and simplified methods have been specified as a result of the analysis."]