TES systems are charged by a heat input when there is excess or inexpensive energy, this heat is then stored and discharged when it is needed. The application of a TES system to a CHP plant allows the plant to deviate from the required thermal load in order to operate in a more economically and environmentally optimal manner. This dearth not only increases operating costs but also emissions, due to the need to burn ultra low sulfur diesel (ULSD). Energy prices are significantly higher during the winter months due to the limited supply of natural gas. Operational data from the UMass CHP district heating system was utilized to validate these benefits. The objective of this paper is to show the economic and environmental benefits that can be attained through the coupling of seasonal thermal energy storage (TES) and combined heat and power (CHP).
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