Question:
Which of the following is a naturally available latent heat storage material for refrigeration?
Which of the following is a naturally available latent heat storage material for refrigeration?
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Water/ice has one of the highest latent heats of fusion (334 kJ/kg) among natural materials. It is the most economical and widely used latent heat storage material in dairy engineering.
Updated On: Aug 7, 2026
- Lithium bromide
- Sodium chloride
- Ice and snow
- Calcium chloride
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Thermal energy storage (TES) systems store thermal energy for later use to balance energy demand between day and night.
TES can utilize sensible heat storage (raising or lowering temperature) or latent heat storage (phase change).
Latent heat storage is highly efficient because phase change materials (PCMs) absorb or release large amounts of energy at a constant temperature during melting or freezing.
Step 2: Detailed Explanation:
Ice and snow are natural, abundant, non-toxic, and inexpensive phase change materials.
During the phase transition from solid (ice) to liquid (water), water absorbs a large amount of latent heat at its constant melting point of 0$^\circ$C.
The latent heat of fusion of ice is exceptionally high:
\[ L_f \approx 334 \text{ kJ/kg} \]
This high latent heat capacity allows ice and snow to store large quantities of cooling energy in a compact volume.
In dairy plants, ice-bank systems are widely used to store thermal energy during off-peak hours (night) and melt the ice during peak processing hours to provide chilled water for rapid milk cooling.
Other listed compounds (such as lithium bromide, sodium chloride, and calcium chloride) are salts that must be dissolved in water to make brine solutions.
While brines are useful for low-temperature sensible cooling, they are not naturally occurring, ready-to-use latent heat storage materials on their own.
Therefore, ice and snow represent the correct naturally available latent heat storage material.
Step 3: Final Answer
The naturally available latent heat storage material for refrigeration is ice and snow.
Thermal energy storage (TES) systems store thermal energy for later use to balance energy demand between day and night.
TES can utilize sensible heat storage (raising or lowering temperature) or latent heat storage (phase change).
Latent heat storage is highly efficient because phase change materials (PCMs) absorb or release large amounts of energy at a constant temperature during melting or freezing.
Step 2: Detailed Explanation:
Ice and snow are natural, abundant, non-toxic, and inexpensive phase change materials.
During the phase transition from solid (ice) to liquid (water), water absorbs a large amount of latent heat at its constant melting point of 0$^\circ$C.
The latent heat of fusion of ice is exceptionally high:
\[ L_f \approx 334 \text{ kJ/kg} \]
This high latent heat capacity allows ice and snow to store large quantities of cooling energy in a compact volume.
In dairy plants, ice-bank systems are widely used to store thermal energy during off-peak hours (night) and melt the ice during peak processing hours to provide chilled water for rapid milk cooling.
Other listed compounds (such as lithium bromide, sodium chloride, and calcium chloride) are salts that must be dissolved in water to make brine solutions.
While brines are useful for low-temperature sensible cooling, they are not naturally occurring, ready-to-use latent heat storage materials on their own.
Therefore, ice and snow represent the correct naturally available latent heat storage material.
Step 3: Final Answer
The naturally available latent heat storage material for refrigeration is ice and snow.
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