Under what condition is the mass capacity of an ammonia receiver measured?

The mass capacity of an ammonia receiver is primarily measured under temperature conditions. This is because the capacity of any refrigeration system component, including receivers, is significantly influenced by temperature. As the temperature changes, so does the density and the phase of ammonia—both of which directly affect the mass that can be stored in the receiver.

When considering how ammonia behaves, it's critical to recognize that increased temperatures can lead to lower density, thus impacting the mass capacity since the volume available remains constant. Conversely, at lower temperatures, ammonia becomes denser, allowing for more liquid ammonia to be held within the same volume of the receiver.

In practical applications, operators must take into account the ambient temperature and the corresponding saturation temperature of ammonia to accurately assess the mass capacity. This relationship ensures that the refrigeration system operates efficiently and safely, maintaining optimal conditions within the ammonia receiver.