Energy retrofit of an office building by substitution of the generation system: performance evaluation via dynamic simulation versus current technical standards

Constructions built in Italy before 1945 (about 30% of the total built stock) feature low energy efficiency. Retrofit actions in this field can lead to valuable energetic and economic savings. In this work, we ran a dynamic simulation of a historical building of the University of Pisa during the hea...

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Bibliographic Details
Published in:Journal of physics. Conference series 2014-01, Vol.547 (1), p.12018-9
Main Authors: Testi, D, Schito, E, Menchetti, E, Grassi, W
Format: Article
Language:English
Subjects:
Boilers
Construction
Dynamical systems
Dynamics
Economic models
Economics
Energy requirements
Heat pumps
Historical buildings
Natural gas
Office buildings
Performance evaluation
Physics
Retrofitting
Simulation
Substitutes
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Summary:Constructions built in Italy before 1945 (about 30% of the total built stock) feature low energy efficiency. Retrofit actions in this field can lead to valuable energetic and economic savings. In this work, we ran a dynamic simulation of a historical building of the University of Pisa during the heating season. We firstly evaluated the energy requirements of the building and the performance of the existing natural gas boiler, validated with past billings of natural gas. We also verified the energetic savings obtainable by the substitution of the boiler with an air-to-water electrically-driven modulating heat pump, simulated through a cycle-based model, evaluating the main economic metrics. The cycle-based model of the heat pump, validated with manufacturers' data available only at specified temperature and load conditions, can provide more accurate results than the simplified models adopted by current technical standards, thus increasing the effectiveness of energy audits.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/547/1/012018