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What is the major source of stored energy on the US electrical grid today?

June 10, 2021
Christopher R. Teeple

1. Describe why energy storage systems are necessary for broad adoption of renewable energy sources in our electricity mix. What is the major source of stored energy on the US electrical grid today?2. What are the desirable characteristics of a grid level energy storage system for energy management?3. There are two types of compressed air energy storage systems: diabatic and adiabatic. Describe why the efficiency of adiabatic systems is higher than that of diabatic systems.4. Batteries are electrochemical storage systems used to produce electricity, utilizing a number of battery types and chemistries. Lithium-ion batteries, classified as secondary batteries, are widely used today. a) What distinguishes primary batteries from secondary batteries? b) Briefly describe how a lithium-ion battery works. C) What is the overall efficiency of a lithium-ion battery that has a charging efficiency of 92% and a discharge efficiency of 94%?5. Briefly describe the UNH ECOLine, including the source of energy and the conversions that take place as energy is converted for use on campus.6. The Tesla Powerpack lithium-ion battery storage system has the following specifications:Installed Capacity – 130 KWStorage Capacity – 232 KWhOutput voltage – 480 VOverall efficiency – 88%a. How long (in hours) can the Powerpack deliver the rated power? b. How much heat is generated by the Powerpack in each charge/discharge cycle?c. What is the output current of the Powerpack (in amps) when operated at the rated power and voltage?

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