Heading towards the nZEB through CHP+HP systems

A comparison between retrofit solutions able to increase the energy performance for the heating and domestic hot water production in residential buildings

Journal article (2017)

Authors

Ferdinando Salata Sapienza University of Rome
Iacopo Golasi Sapienza University of Rome
Umberto Domestico Sapienza University of Rome
Matteo Banditelli Sapienza University of Rome
Gianluigi Lo Basso Sapienza University of Rome
B. Nastasi Building Physics - Architecture and the Built Environment
Andrea de Lieto Vollaro Sapienza University of Rome
Research Group
Building Physics (Architecture and the Built Environment) (TU Delft)
Energy efficiency NZEB Energy performance certificate CHP+HP Residential sector Retrofit solution
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Published Date

2017

Language

English

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Faculty

Architecture and the Built Environment

Department

Architectural Engineering +Technology

Research Group

Building Physics

Abstract

Optimizing consumptions in the field of civil construction led to define energy labels for residential buildings. To calculate the building energy demand the EPgl was determined, i.e. the annual consumption per m2 of primary energy. This paper examines the technical solutions useful to optimize the energy demands for heating during space-heating season and domestic hot water production (thanks to energy analysis softwares as MC11300 and TRNSYS) and, at the same time, to take into account the financial issues those interventions implied. The total inside heated surface of the building case study is 1204.00 m2, hence the inside heated volume is about 3250.80 m3. Besides the more traditional interventions concerning the building envelope and its systems, the paper examined the performance of a system obtained through the combination of a cogenerator (CHP) and a heat pump (HP), thus, substituting the conventional boilers of the buildings. CHP+HP solution increases the most the energy label of the building (from a D class with EPgl = 59.62 kW h m−2 year−1, to an A class, with EPgl = 25.64 kW h m−2 year−1), determining an annual energy cost saving of 3,114 € year−1, allowing to amortize installation costs (54,560 €) in a reasonable payback period, i.e. 15.4 years. This innovative solution in the residential sector can be realized through retrofit interventions on existing buildings, hence it leads the current dwelling towards nZEB with a remarkable benefits for the environment.