A room contains air at 27C and 101 kPa at a relative humidity of 88 percent....
Humid air at 101 kPa, 25°C, 90% relative humidity is compressed in a steady-flow, isentropic compressor to 800 kPa. (a) What is specific humidity of the air? (b) What is the relative humidity of the air exiting the compressor? (c) What is the change in enthalpy of the dry air during this process? (d) What is the change in enthalpy of the water vapor, per unit dry air, during this process? Express your answer in kilojoules per kilogram of dry...
A room contains air at 20 C and a total pressure of 95 kPa with a relative humidity of 40 percent. The gas constant for air is 0.287 kJ/(kg-K). The mass of dry air in the room is 30 kg. What is the volume of the room in m3 :
The air in a room is at 25 °C and a total pressure of 101.325 kPa . Air contains water vapor with a partial pressure of 1.76 kPa. a. Calculate the air humidity and relative humidity. b. Since you intend to use this air for drying fre sh fruits you plan to heat up the air to 50°C. Once you accomplish that, what would be the new relative humidity of the air if the moisture content is maintained? c. Intuitively...
9 Air at 20 "C. 100 kPa and a relative humidity of 90% exists in a room having 3m x 3m x 3m dimensions. Determine 1. the partial pressure (kPa) of dry air II. the specific humidity (g/kEda) III the enthalpy per unit mass of the dry air (ki/kedal (At 30 °C, Psar 4.25 kPa) (For dry air R-0.287) a) (1) 55 (II) 65 (III) 77 b) (0) 3.9 (II) 20.4 (III) 68.5 (1 93 (II) 21.8 (III) 95.2 d...
1. A room in Universiti Malaysia Pahang, Pekan Campus contains atmospheric air at 30°C and 45% of temperature and relative humidity, respectively. Partial pressure of the dry air is 96 kPa with its standard specific heat of 1.005 kJ/kg K. Determine for this air its specific humidity (in kg H2O/kg dry air), and specific enthalpy (in kJ/kg dry air).
absolute humidity at atmospheric pressure at 27 C is 0.011 kg water / dry air determine: a. water vapor partial pressure (kPa) b. relative humidity (%) c. dew point temperature (C)
The air in a room has dry bulb temperatures of 27 ° C and 20 ° C wet bulb. Determine the specific humidity and humidity relative considering a pressure of 100 kPa.
On a summer day the pressure is 1 atm, the temperature is 32°C,
and the relative humidity is 95 percent. This air is to be
conditioned to 24°C and 60 percent relative humidity.
a) Determine the amount of cooling, in kJ, required and
b) Water removed, in kg, per 1000 m3 of dry air processed at the
entrance to the system.
Cooling coils Ti 32С ф,-95% т,-24°C φ2 60% l atm Condensate
Cooling coils Ti 32С ф,-95% т,-24°C φ2 60%...
1 kg of atmospheric air initially at 30 ºc and 60% relative humidity is cooled slowly, at a constant pressure of 100 kPa, to a final temperature of 5 ºc. a. What is the saturation pressure of water at the initial temperature? b. What is the partial pressure of water vapor (vapor pressure) at the initial condition? c. What is the partial pressure of dry air at the initial condition? d. What is the initial humidity ratio? e. What is...
1. (relative humidity) The partial pressure of water vapor in air is usually less than the equilibrium vapor pressure (or saturation pressure) at the ambient temperature; this is why a cup of water will spontaneously evaporate. The ratio of the partial pressure of water vapor to the equilibrium vapor pressure (at the same temperature) is called the relative humidity. Saturated air, at 100% relative humidity, would be in equilibrium with a cup of liquid water. The saturation pressure depends strongly...