As the percentage of water increases in an ammonia charge, what happens to the SAT boiling temperature at various pressures?

When the percentage of water in an ammonia charge increases, the saturation boiling temperature actually increases. This phenomenon occurs because the addition of water elevates the boiling point of the mixture.

In a solution of ammonia and water, the boiling point is influenced by the physical properties of both substances. When more water is present, it alters the vapor pressure of the mixture, necessitating a higher temperature to achieve the same saturating conditions that were present with a lower concentration of water.

This increase in boiling temperature with respect to rising water concentration is due to the colligative properties of the solutions, where the presence of a solute (in this case, water) impacts the solution's boiling point. It is essential for operators to understand the implications of varying water content in ammonia systems, as it can affect operational efficiency and safety.