Discussion
Consider the following statements about energy storage.
1. A flow battery can be sized for energy and power independently 2. Hydrogen storage has a higher round trip efficiency than a lithium ion battery 3. Ice storage exploits the latent heat of fusion
Answer: A
Correct answer: 1 and 3 only are correct
Statements 1 and 3 are correct: the flow battery’s tanks and stack size the energy and the power independently, and ice storage works on the latent heat of fusion of water. Statement 2 is the reverse of the truth - hydrogen returns only about 30 to 40 per cent of what it takes in against a lithium ion battery’s 90, and it is chosen for duration rather than efficiency.
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