Exam 14: Gas-Vapor Mixtures and Air-Conditioning

The air in a house is at 25°C and 72 percent relative humidity. Now the air is cooled at constant pressure. The temperature at which the moisture in the air will start condensing is

A 35-m³ room contains air at 25°C and a total pressure of 90 kPa with a relative humidity of 85%. The mass of dry air in the room is

Air in a space heating system is heated while being humidified by steam injection. On the psychrometric chart, this process will appear as a line that is

On the psychrometric chart, a cooling and dehumidification process appears as a line that is

Air is cooled and dehumidified as it flows over the coils of a refrigeration system at 90 kPa from 25°C and a humidity ratio of 0.021 kg/kg dry air to 15°C and a humidity ratio of 0.015 kg/kg dry air. If the mass flow rate of dry air is 0.7 kg/s, the rate of heat removal from the air is

A room contains 40 kg of dry air and 0.5 kg of water vapor at 20°C and 95 kPa total pressure. The relative humidity of air in the room is

On the psychrometric chart, a simple heating process (no humidification or dehumidification) appears as a line that is

A room contains air at 25°C and a total pressure of 87.0 kPa with a relative humidity of 85%. The partial pressure of dry air is

A room is filled with saturated moist air at 20°C and a total pressure of 90 kPa. If the mass of dry air in the room is 100 kg, the mass of water vapor is

Air at a total pressure of 85 kPa, 15°C, and 70 percent relative humidity is heated and humidified to 25°C and 60 percent relative humidity by introducing water vapor. If the mass flow rate of dry air is 4.6 kg/s, the rate at which steam is added to the air is