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• ### 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...

• ### 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...

• ### The atmospheric air 32 °C dry bulb temperature and 70% relative humidity supplied to the cooling...

The atmospheric air 32 °C dry bulb temperature and 70% relative humidity supplied to the cooling coil at a rate of 45m3/min. The air cooling to the saturated state and leaving at a temperature of 16 °C. Determine: a- Specific humidity at each state. b- Wet bulb and dew point temperatures at the final state c- Final relative humidity. d- Mass of water condensed. e- Rate of heat removed from the air in kW. f- Show the process on Psychrometric...

• ### Air enters a heating and humidification system at 5◦C, 50% relative humidity. The air first passe...

Air enters a heating and humidification system at 5◦C, 50% relative humidity. The air first passes over a heater, and is then humidified with steam. The steam is supplied at 200 kPa pressure and 300◦C. The air leaves the system at 30◦C, 60% relative humidity. (a) Determine the heat transfer to the air, per unit mass dry air. (b) Determine the temperature and relative humidity of the air leaving the heating section (i.e., prior to the humidification section). (c) Determine...

• ### Atmospheric air at 32°C and 70% relative humidity passes through a cooling section in an air-conditioning...

Atmospheric air at 32°C and 70% relative humidity passes through a cooling section in an air-conditioning duct where the air is cooled below its dew point and some of the water is removed. The air then passes over a heating section where heat is added until the final temperature is 22°C and the relative humidity is 45%. Assume the process occurs at constant pressure of 1 atm. Using the psychrometric chart, determine: (a) The amount of water removed in the...

• ### Consider a “cold” winter day in with an air temperature of 7.22 °C and relative humidity...

Consider a “cold” winter day in with an air temperature of 7.22 °C and relative humidity of about 20% (moisture content 0.001 g H2O/g dry air). A person waiting at a bus stop inhales at an average rate of 8 g dry air/min and exhales air saturated with water at body temperature (37°C) and 1 atm (molal humidity is 6.7%). The heat capacity of dry air is 1.05 J/g- °C. Estimate the rate of heat loss from breathing. Express your...

• ### 150 ft3/min of air at 80F dry-bulb temperature and 70% relative humidity enters an air conditioning...

150 ft3/min of air at 80F dry-bulb temperature and 70% relative humidity enters an air conditioning unit and leaves it as saturated air at 50F. Part of the moisture in the air that condensate is collected and removed at 55F. Draw the cycle on the attached chart and a)Determine the rates of heat removal from the air. b)Determine the rate of moisture removal from the air

• ### The air in a building has a dry bulb temperature of 72F and 40% relative humidity....

The air in a building has a dry bulb temperature of 72F and 40% relative humidity. They are trying to achieve The building is 45’ long, 37’ wide, and has a 10’ ceiling. Find the quantity of water required to raise the relative humidity to 55%

• ### A moist air of 25 °C and 200 kPa with relative humidity of 50% is mixed...

A moist air of 25 °C and 200 kPa with relative humidity of 50% is mixed with nitrogen of 25 °C and 200 kPa. Then, the mixture is expanded through a turbine to 100 kPa. Assuming the turbine is ideal, determine the minimum nitrogen and moist air mole ratio (kmol N2/kmol moist air) that does not induce condensation within the turbine. Assume specific heat ratios are same for water vapor, dry air, and nitrogen as 1.4. 3. (10 points) A...

• ### Air at 104°F with a relative humidity of 30% enters a heater and leaves at 77°F...

Air at 104°F with a relative humidity of 30% enters a heater and leaves at 77°F with a relative humidity of 20%. The volumetric flow rate leaving the system is 1,000 in3 per second. Using the psychrometric chart determine the flow rate of dry air (lb/min) through the dryer, whether water is evaporated or condensed, and the rate at which the condensation or evaporation occurs (lb/min)