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)
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An air mixture is intended to moisturize. A temperature of 20 oC
with a relative humidity...
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...
- 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...
15. The relative humidity of air equals the ratio of the partial pressure of water in the air to ...
15. The relative humidity of air equals the ratio of the partial pressure of water in the air to the equilibrium vapor pressure of water at the same temperature times 100%. If the relative humidity of the air is 56% and its temperature is 70°F, how many grams of water are present in a room measuring 15 ft x 10 ft x 11 ft? The vapor pressure of water at 68 °F is 17.54 torr. Show your work
15. The...
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...
a) Define relative humidity (2 marks) b) Describe the relation between relative humidity, the capacity of...
a) Define relative humidity (2 marks) b) Describe the relation between relative humidity, the capacity of air to hold moisture a ambient temperature. (2 marks) c) Moist air at 22°C and a wet bulb temperature of 9°C enters a steam spray humidifier. The mass flow of the dry air is 90 kg/min. Saturated water vapor at 110 °C is injected into the mixture at a rate of 52 kg/hr. There is no heat transfer with the surroundings, and the pressure...
An air mass has a temperature of 18°C and a relative humidity of 42%. a) Determine the vapor pres...
An air mass has a temperature of 18°C and a relative humidity of 42%. a) Determine the vapor pressure and saturation vapor pressure of the air. You can use tables from the Gupta text, or the equations presented in class (which are alsc in the evapotranspiration references on the camino site). Or you may use both to be more confident of your work. b) Assume the air mass rises and cools at a rate of -10 C/km. At what elevation...
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.
When the air temperature is high the human body uses sweating followed by evaporative cooling to...
When the air temperature is high the human body uses sweating followed by evaporative cooling to control its temperature. This works only if the surrounding air is not already saturated with water, i.e., for relative humidities significantly below 100%. As it turns out, a 70.% relative humidity on a 90.ºF summer day in Florida will already feel very uncomfortable in the absence of a breeze. (a) Calculate the saturation (equilibrium) vapor pressure of water at 90.ºF and the actual vapor...
2. Calculate the absolute humidity, relative saturation, and dew-point temperature of a mixture of benzene-nitrogen at...
2. Calculate the absolute humidity, relative saturation, and dew-point temperature of a mixture of benzene-nitrogen at a pressure of 1.5 bar and temperature of 320 K if the partial pressure of benzene in the mixture is 0.2 bar. (3.0 Points)
9. A building has indoor air conditions of 70°F dry bulb temperature and 40% relative humidity....
9. A building has indoor air conditions of 70°F dry bulb temperature and 40% relative humidity. Determine the direction of water vapor flow under the following outdoor air conditions that represent a dry, heating climate: a. 32°F dry bulb temperature and 40% relative humidity (winter conditions) b. 90°F dry bulb temperature and 20% relative humidity (summer conditions) DO
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...
15. The relative humidity of air equals the ratio of the partial pressure of water in the air to the equilibrium vapor pressure of water at the same temperature times 100%. If the relative humidity of the air is 56% and its temperature is 70°F, how many grams of water are present in a room measuring 15 ft x 10 ft x 11 ft? The vapor pressure of water at 68 °F is 17.54 torr. Show your work
15. The...
a) Define relative humidity (2 marks) b) Describe the relation between relative humidity, the capacity of air to hold moisture a ambient temperature. (2 marks) c) Moist air at 22°C and a wet bulb temperature of 9°C enters a steam spray humidifier. The mass flow of the dry air is 90 kg/min. Saturated water vapor at 110 °C is injected into the mixture at a rate of 52 kg/hr. There is no heat transfer with the surroundings, and the pressure...
An air mass has a temperature of 18°C and a relative humidity of 42%. a) Determine the vapor pressure and saturation vapor pressure of the air. You can use tables from the Gupta text, or the equations presented in class (which are alsc in the evapotranspiration references on the camino site). Or you may use both to be more confident of your work. b) Assume the air mass rises and cools at a rate of -10 C/km. At what elevation...
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.
2. Calculate the absolute humidity, relative saturation, and dew-point temperature of a mixture of benzene-nitrogen at a pressure of 1.5 bar and temperature of 320 K if the partial pressure of benzene in the mixture is 0.2 bar. (3.0 Points)
9. A building has indoor air conditions of 70°F dry bulb temperature and 40% relative humidity. Determine the direction of water vapor flow under the following outdoor air conditions that represent a dry, heating climate: a. 32°F dry bulb temperature and 40% relative humidity (winter conditions) b. 90°F dry bulb temperature and 20% relative humidity (summer conditions) DO
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