Rhode Island Journeyman's Refrigeration License Practice Test

The refrigeration effect of ice melting in water is a fundamental concept in thermodynamics and refrigeration. When ice at 32 degrees Fahrenheit undergoes a phase change to water, it absorbs a specific amount of heat, known as the latent heat of fusion.

For ice, the latent heat of fusion is approximately 144 BTUs per pound. This value represents the amount of energy required to change one pound of ice at 32 degrees Fahrenheit into one pound of water at the same temperature without any change in temperature during the phase change. Thus, when the ice melts, it efficiently removes heat from its surroundings, providing the cooling effect necessary in refrigeration applications.

Understanding this process is crucial for anyone working in refrigeration, as it highlights the significant energy transfer that occurs during phase changes, which is a key principle in the operation of cooling systems.