GCAP Operator 2 Practice Exam

The latent heat of evaporation refers to the amount of heat required to change a unit mass of a substance from liquid to vapor without a change in temperature. At any given temperature, this value can vary based on the specific conditions and properties of the substance.

In the case of saturated air temperature (SAT) conditions at 10°F, the latent heat of evaporation is approximately 560 BTUs per pound of water. This value is derived from the thermodynamic properties of water and reflects the significant amount of energy needed to convert water into steam at this low temperature.

Understanding the latent heat of evaporation is crucial for HVAC and refrigeration processes, where it plays a vital role in cooling systems and understanding humidity control.

At lower temperatures like 10°F, the latent heat remains relatively high, since the state change from liquid to vapor still requires significant energy despite the cold temperatures. This value is important for engineers and operators when designing systems that rely on vaporization for cooling and dehumidification.

In summary, the correct answer of 560 BTUs aligns with established thermodynamic data for latent heat at the specified conditions, making it essential knowledge for applications in engineering and environmental control systems.