In order to reduce emissions in the energy sector, the renewable share on the market is going to grow rapidly in the future. Since most of the investments are in intermittent renewable energy sources such as solar and wind, old fossil fuel power plants must operate in a more flexible and discontinuous way, turning off when the renewable plants can satisfy the demand, and turning on when the load increase, like in the evening. In this work a study about a combined cycle system with Thermal Energy Storage and heat pump is presented, which is capable not only to respond flexibly to load variations during the day but also to absorb part of any overproduction by means of a Brayton cycle heat pump. The system was optimized and simulated on MATLAB and an analysis of the economic performance of this solution was carried out in this environment. From the results, it emerged that the convenience of this type of system is strictly correlated with the profile of electricity prices during the day. It is not competitive for prices characterized by little variations like the current ones, but instead proving to be a potentially interesting solution in the case of a curve of prices characterized by large variations as in a hypothetical scenario with strong renewable penetration.
Visto il grande incremento nell’utilizzo di fonti rinnovabili intermittenti, come solare ed eolico, volto a ridurre le emissioni di gas serra dal settore energetico si è deciso di studiare un sistema a ciclo combinato con stoccaggio termico e pompa di calore che sia in grado non solo di rispondere in maniera flessibile alle variazioni di carico durante la giornata, ma anche di assorbire parte dell’eventuale sovrapproduzione per mezzo di una pompa di calore a ciclo Brayton. Il sistema è stato ottimizzato e simulato su MATLAB e sempre in questo ambiente si è svolta un’analisi delle prestazioni economiche di tale soluzione. Dai risultati è emerso che la convenienza di questo tipo di impianto è strettamente correlata al profilo dei prezzi dell’energia elettrica durante la giornata, non risultando competitivo per prezzi mediamente poco variabili come quelli attuali, ma risultando invece una soluzione potenzialmente più interessante nel caso si abbia una curva dei prezzi caratterizzata da grandi variazioni come in un ipotetico scenario a forte penetrazione rinnovabile.
Integrazione di una pompa di calore e stoccaggio termico in un sistema con turbina a gas e ciclo ORC
ALBERTI, MARCO
2022/2023
Abstract
In order to reduce emissions in the energy sector, the renewable share on the market is going to grow rapidly in the future. Since most of the investments are in intermittent renewable energy sources such as solar and wind, old fossil fuel power plants must operate in a more flexible and discontinuous way, turning off when the renewable plants can satisfy the demand, and turning on when the load increase, like in the evening. In this work a study about a combined cycle system with Thermal Energy Storage and heat pump is presented, which is capable not only to respond flexibly to load variations during the day but also to absorb part of any overproduction by means of a Brayton cycle heat pump. The system was optimized and simulated on MATLAB and an analysis of the economic performance of this solution was carried out in this environment. From the results, it emerged that the convenience of this type of system is strictly correlated with the profile of electricity prices during the day. It is not competitive for prices characterized by little variations like the current ones, but instead proving to be a potentially interesting solution in the case of a curve of prices characterized by large variations as in a hypothetical scenario with strong renewable penetration.File | Dimensione | Formato | |
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https://hdl.handle.net/20.500.12608/61457