TY - JOUR N2 - Buildings consume half of all energy use and are also responsible for a similar proportion of carbon dioxide emission. The heat transfer across the building envelope - the shell of a house that separates the inside and outside - should generally be minimized. In the paper validation and verification based on Building Energy Simulation Test (BESTEST) of Energy3D computer code is presented. Next, computations performed by means of Energy 3D and Energy Plus for BESTEST building are compared. In the last part of the paper results for computations for real building are presented. Program Energy 3D proved to be an excellent tool for qualitative and quantitative analysis of buildings with respect to energy consumption. L1 - http://journals.pan.pl/Content/115634/PDF-MASTER/27_ace-2018-0067.pdf L2 - http://journals.pan.pl/Content/115634 PY - 2018 IS - No 4/II EP - 153 KW - energy efficient buildings KW - simulation KW - verification KW - validation KW - FEM KW - FVM KW - FDM A1 - Gajewski, R.R. A1 - KuĊ‚akowski, T. PB - WARSAW UNIVERSITY OF TECHNOLOGY FACULTY OF CIVIL ENGINEERING and COMMITTEE FOR CIVIL ENGINEERING POLISH ACADEMY OF SCIENCES VL - Vol. 64 DA - 15.12.2018 T1 - Towards optimal design of energy efficient buildings SP - 135 UR - http://journals.pan.pl/dlibra/publication/edition/115634 T2 - Archives of Civil Engineering ER -