To pursue the EU's decarbonization strategy, it is crucial to focus on the sectors with the highest energy demands, such as the residential sector. A huge potential lies in district heating systems where waste heat and renewable sources can replace part of the primary energy supply. In this thesis, different district heating scenarios are evaluated from an energy, economic and environmental perspective for the Forlanini district of Milan. The district is characterized by residential buildings built in the 60s and 80s that for the most part have never been retrofitted. The pre-design of the different scenarios analyzed is carried out through the adoption of the FLEXYNETS tool, developed within an EU H2020 project. The different scenarios are based on two profiles of the thermal demand: the actual one and that achieved after an important retrofit of the buildings. For both cases, different scenarios of district heating network operating at high and ultra-low temperature levels are analyzed. From an economic point of view, based on the assumptions made, the annual costs of a high temperature district heating network compared to an ultra-low temperature one are always higher regardless of the energy demand considered. From an environmental point of view, CO2eq emissions can be halved depending on energy demand and the type of the network. The ratio of heat losses to the heat injected into the network is negligible for low-temperature scenarios regardless of energy demand, while for high temperature scenarios it is in the range of 4%-7%. The adoption of a network in which there is only electricity consumption can lead to a 30% reduction in primary energy consumption compared to a network powered by fossil fuels. Therefore, on the basis of the results achieved, the adoption of ultra-low temperature network may prove promising under certain conditions.
PPer perseguire la strategia di decarbonizzazione dell'UE, è fondamentale concentrarsi sui settori che presentano una elevata domanda di energia, come il settore residenziale. Un enorme potenziale trova posto nei sistemi di teleriscaldamento dove il calore di scarto e le risorse rinnovabili possono sostituire gran parte della richiesta di energia primaria. In questo lavoro di tesi sono valutati diversi scenari di teleriscaldamento dal punto di vista energetico, economico ed ambientale per il quartiere Forlanini di Milano. Il quartiere è caratterizzato da edifici residenziali costruiti negli anni '60 e '80 che per la maggior parte non sono mai stati ristrutturati. Il dimensionamento dei diversi scenari analizzati è effettuato tramite l’uso dello strumento FLEXYNETS, sviluppato nell’ambito del progetto europeo H2020. I diversi scenari si basano su due profili della domanda termica: quello effettivo e quello ottenuto dopo un importante retrofit degli edifici. Per entrambi i casi vengono analizzati diversi scenari di teleriscaldamento che operano a livelli di temperatura alti e bassi. Dal punto di vista economico, in base alle assunzioni fatte, i costi annuali di una rete ad alta temperatura rispetto ad una rete a bassa temperatura sono sempre più elevati a prescindere dalla domanda di energia considerata. Sotto il profilo ambientale le emissioni di CO2eq possono essere dimezzate a seconda della domanda di energia e della tipologia di rete. Il rapporto tra le perdite di calore rispetto al calore immesso in rete è trascurabile per gli scenari a bassa temperatura a prescindere dalla domanda mentre per quelli ad alta temperatura risulta dell’ordine del 4%-7%. L'adozione di una rete con solo consumi elettrici può portare fino ad una riduzione del 30% del consumo di energia primaria rispetto ad una rete alimentata da combustibili fossili. Pertanto, sulla base dei risultati conseguiti, l'adozione di reti a bassa temperatura può rivelarsi in determinate condizioni promettente.
Energy, economic and environmental assessment of district heating integration scenarios in urban contexts : the case of Forlanini district, Milan
Rigon, Alessandra
2021/2022
Abstract
To pursue the EU's decarbonization strategy, it is crucial to focus on the sectors with the highest energy demands, such as the residential sector. A huge potential lies in district heating systems where waste heat and renewable sources can replace part of the primary energy supply. In this thesis, different district heating scenarios are evaluated from an energy, economic and environmental perspective for the Forlanini district of Milan. The district is characterized by residential buildings built in the 60s and 80s that for the most part have never been retrofitted. The pre-design of the different scenarios analyzed is carried out through the adoption of the FLEXYNETS tool, developed within an EU H2020 project. The different scenarios are based on two profiles of the thermal demand: the actual one and that achieved after an important retrofit of the buildings. For both cases, different scenarios of district heating network operating at high and ultra-low temperature levels are analyzed. From an economic point of view, based on the assumptions made, the annual costs of a high temperature district heating network compared to an ultra-low temperature one are always higher regardless of the energy demand considered. From an environmental point of view, CO2eq emissions can be halved depending on energy demand and the type of the network. The ratio of heat losses to the heat injected into the network is negligible for low-temperature scenarios regardless of energy demand, while for high temperature scenarios it is in the range of 4%-7%. The adoption of a network in which there is only electricity consumption can lead to a 30% reduction in primary energy consumption compared to a network powered by fossil fuels. Therefore, on the basis of the results achieved, the adoption of ultra-low temperature network may prove promising under certain conditions.File | Dimensione | Formato | |
---|---|---|---|
2022_07_Rigon.pdf
solo utenti autorizzati a partire dal 07/07/2025
Descrizione: testo tesi
Dimensione
1.75 MB
Formato
Adobe PDF
|
1.75 MB | Adobe PDF | Visualizza/Apri |
I documenti in POLITesi sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
https://hdl.handle.net/10589/191828