Upgrading the energy performance of office buildings in Greece -Trends and potentials.

In this paper the energy performance and thepotentials of the energy savings decrease in twooffice buildings in northern Greece areexamined, within the frames of a renovationproject in office buildings of the public sector.Energy audits and simulations were performedfor this reason. Significant energy savings wereachieved in both cases. The most effectivemeasures were the installation energy efficientwindows, the improvement of the insulation ofthe roof and the external walls, the solar shadingand the natural ventilation strategies, theinstallation of highly efficient HVAC systemsand the upgrading of the lighting. The energysavings overcome the problems of the increasedventilation that proved to be necessary in thelounge areas and the problems of the veryincreased internal gains due to the newincreased IT equipment. Adequate and flexibleenergy management and upgrading strategiescan be implemented to the existing buildingproject plans.