3. Energy Storage and Flexibility

Thermal Storage — Quiz

Test your understanding of thermal storage with 5 practice questions.

Practice Questions

Question 1

Which of the following is a key advantage of thermochemical thermal storage compared to latent heat storage?

Question 2

To store $500 \mathrm{kWh}$ of thermal energy in a sensible heat tank using water (c=$4.2 \mathrm{kJ/(kg K)}$) between $20 \mathrm{^\circ C}$ and $70 \mathrm{^\circ C}$, what minimum water volume is required ($\rho$=$1000 \mathrm{kg/m^3}$)?

Question 3

Which property of a phase change material (PCM) defines the temperature at which it absorbs or releases latent heat?

Question 4

Compare the volumetric energy density of a water-based sensible heat storage operating between $20 \mathrm{^\circ C}$ and $80 \mathrm{^\circ C}$ (c=$4.2 \mathrm{kJ/(kg K)}$, $\rho$=$1000 \mathrm{kg/m^3}$) to a PCM with $\rho$=$800 \mathrm{kg/m^3}$ and latent heat of fusion $150 \mathrm{kJ/kg}$. Which has the higher volumetric energy density?

Question 5

What is a primary benefit of a hybrid sensible-latent thermal storage system?