Paper Conference

Proceedings of BSA Conference 2015: Second Conference of IBPSA-Italy


Analysis of energy efficiency measures on envelope and control systems: case study for an existing building

Giovanni Semprini, Alessandro Gober, Francesca Zandi

Abstract: The buildings dating back to the Italian economic boom of the 60s and 70s are the biggest part of the national building heritage. In general they have an envelope with very poor thermal insulation and a central heating system with high energy consumption, sometimes due to the lack of a proper control system, obsolete components and a not balance pipe network. This group of buildings is one of the first targets to be addressed through building renovation and improving plant. Energy retrofitting actions is the main direction not only to provide a reduction in CO2 emissions and money saving but also to achieve thermal comfort for a large number of families. In order to reach both these objectives, a pipe balancing and proper control systems must accompany every kind of envelope upgrading. This paper deals with the interaction between the envelope refurbishment and the optimization of the plant control system in a typical 60s-70s Italian residential multi-floor building served by a central heating system, focusing on a single flat. After a proper calibration of the model, based on experimental measurements of the internal temperature and operating conditions of the heating plant, the dynamic simulation assessed through EnergyPlus was used to analyze the efficiency of different control systems to improve the energy performances: use of climatic curve control, zone control with ambient thermostat or thermostatic valves, and different proportional bands. Simulation results indicate high energy savings.
Pages: 507 - 515