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25. Homework: Twenty liters of air at 20°C and a relative humidity of 60% are compressed...
1 kg of atmospheric air initially at 30 ºc and 60% relative humidity is cooled slowly,...
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...
11-35.A moist air mixture with a dry bulb temperature of 48°C, a relative humidity of 40...
11-35.A moist air mixture with a dry bulb temperature of 48°C, a relative humidity of 40 percent, and a total pressure of 160 kPa is contained in a rigid vessel having a volume of 1.65 m3. The air is cooled until the dry bulb temperature reaches 23°C. Determine the amount of heat transferred, the final pressure of the air, and the amount of water vapor condensed during the process.
On a summer day, the air temperature is 36°C and the relative humidity is 20%. Water...
On a summer day, the air temperature is 36°C and the relative humidity is 20%. Water evaporates from the surface of a lake at a rate of 0.20 kg/h per square metre of water surface area. The temperature of water is 25°C. (a) Determine the mass transfer coefficient. (10 marks) (b) Determine the convective heat transfer coefficient. (10 marks) (c) Determine the net heat loss (in W/m2) from the lake. (5 marks) The specific volume of water vapour at 25°C...
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...
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%...
Humid air at 101 kPa, 25°C, 90% relative humidity is compressed in a steady-flow, isentropic compressor...
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...
1. (relative humidity) The partial pressure of water vapor in air is usually less than the...
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...
PH) 3) Air at a temperature of 60 F and a relative humidity of 60% with...
PH) 3) Air at a temperature of 60 F and a relative humidity of 60% with a flow rate of 1000 # 3/min enters a warm-air furnace and humidifier unit. The air leaves the unit at a temperature of 120 F and a relative humidity of 12%. If the air flows through the unit at a pressure of 14.5 psia and if the water is supplied to the humidifier at 65 F, using the appropriate equations, determine: a) the mass...
- Air at a temperature of 20 0C and 750 mm Hg has a relative humidity...
- Air at a temperature of 20 0C and 750 mm Hg has a relative humidity of 80%. Calculate, (i)The molal humidity of the air (ii)The molal humidity of this air if its temperature is reduced to 10 °C and pressure increased to 2000 mm Hg condensing out some of the water (iii)Weight of water condensed from 1000 litre of the original wet air Vapour pressure of water at 20 °C = 17.5 mm Hg Vapour pressure of water at...
A person breathes 10 liters per minute of air that is at 68 degree and 50%...
A person breathes 10 liters per minute of air that is at 68 degree and 50% relative humidity. [Relative humidity is the ratio of the actual vapor density to the saturation vapor density. The saturation vapor density is the maximum amount of water vapor that the air can hold at a particular temperature and is given in grams/meter cu bed] Given: Saturation vapor density at 20 deg. Celsius = 17.3 grams/meter cubed Saturation vapor density at 37 deg. Celsius =...
An air mixture is intended to moisturize. A temperature of 20 oC with a relative humidity...
An air mixture is intended to moisturize. A temperature of 20 oC with a relative humidity of 70%. If you increase the relative humidity by 90%. What molar fraction of water is needed in air at 70% and 90% humidity? (Use saturation pressure)
11-35.A moist air mixture with a dry bulb temperature of 48°C, a relative humidity of 40 percent, and a total pressure of 160 kPa is contained in a rigid vessel having a volume of 1.65 m3. The air is cooled until the dry bulb temperature reaches 23°C. Determine the amount of heat transferred, the final pressure of the air, and the amount of water vapor condensed during the process.
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. (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...
PH) 3) Air at a temperature of 60 F and a relative humidity of 60% with a flow rate of 1000 # 3/min enters a warm-air furnace and humidifier unit. The air leaves the unit at a temperature of 120 F and a relative humidity of 12%. If the air flows through the unit at a pressure of 14.5 psia and if the water is supplied to the humidifier at 65 F, using the appropriate equations, determine: a) the mass...
A person breathes 10 liters per minute of air that is at 68 degree and 50% relative humidity. [Relative humidity is the ratio of the actual vapor density to the saturation vapor density. The saturation vapor density is the maximum amount of water vapor that the air can hold at a particular temperature and is given in grams/meter cu bed] Given: Saturation vapor density at 20 deg. Celsius = 17.3 grams/meter cubed Saturation vapor density at 37 deg. Celsius =...
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