3. Air at a dry bulb temperature of 40C and a wet bulb temperature of 20C...
3. Air at a dry bulb temperature of 40C and a wet bulb
temperature of 20C is first heated in a heater to a dry bulb
temperature of 90C. Then it is passed through a bed of apricot
slices to dry them. The air exiting from the top of the apricot bed
is at a dry bulb temperature of 60C. It is then passed through a
dehumidifier to reduce its relative humidity to 10%. Clearly show
the various paths of the process on a psychrometric chart. The air
velocity through the bed and the dehumidifier is 4 m/s and the
cross-sectional diameter of the bed is 0.5m.
a. Determine the amount of moisture removed, in grams of
water/second from the apricot bed.
b. Determine the amount of moisture removed, in grams of
water/second in the dehumidifier.
Homework Answers
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3. Air at a dry bulb temperature of 40C and a wet bulb
temperature of 20C...
the result of air measurements obtained dry bulb temperature 48 C and wet bulb temperature 29...
the result of air measurements obtained dry bulb temperature 48 C and wet bulb temperature 29 C. By using a psychrometric chart, detemine the nature of air aa follows: a. air humidity (%) b. water content (kg water/ kg air) c. specific volume (m³/kg) d. enthalpy (kj/kg) e. condensation temperature (C) If air is in the room 162 m³, determine: f. air weight (dry air and water vapor) g. the amount of the water in the room (kg) pls help...
2) Very humid air enters a dehumidifier at 500 ft^3/min. The air is at a dry-bulb...
2) Very humid air enters a dehumidifier at 500 ft^3/min. The air is at a dry-bulb temperature of 85 degrees F and a relative humidity of 90%. The specific humidity of the mixture must be brought to 30 grains of water per pound mass of air. Assume atmospheric mixture pressure. A) How low must the dry-bulb temperature go to achieve this? B) What is the rate at which energy must be removed to accomplish the reduction in specific humidity, in...
An air conditioner operating at steady state takes in moist air at 30 °C, 1 bar and a wet bulb temperature of 25
An air conditioner operating at steady state takes in moist air at 30 °C, 1 bar and a wet bulb temperature of 25 °C. The moist air is cooled in the dehumidifier unit and some of the water is removed. There is 10 tons of cooling in the dehumidifier (also called the evaporator of an air conditioner). The condensate and the saturated air stream discharging the section is at 10 °C The moist air is then heated in the heater...
Air in a factory for drying apricots had dry bulb temperature of (Tdry) 25oC and wet...
Air in a factory for drying apricots had dry bulb temperature of (Tdry) 25oC and wet bulb temperature of (T wet) 15oC. What are the RH, dew point, Humidity ratio, specific volume and vapour pressure values. Second we are drying 10 Kg apricots of 85% moisture in batch production ending up with 60 % moisture content using a fan that blows hot air. We measured the air characteristics and found that Tdry = 35 oC and Twet=28 oC. The fan...
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...
u ut slatept I. 5. A dehumidifier is used to extract excess moisture from the air...
u ut slatept I. 5. A dehumidifier is used to extract excess moisture from the air inside a room with dimensions 8x6x3 m3. The room was initially at a dry bulb temperature of 30°C, 70% relative humidity and ends up to a wet bulb temperature of 11°C, 100% relative humidity. If the dry air density is 1.2 kg/m3, what mass of water vapour has been removed by the dehumidifier?
What would be the dry bulb temperature, wet bulb temperature, dew point, percent saturation, enthalpy and...
What would be the dry bulb temperature, wet bulb temperature, dew point, percent saturation, enthalpy and humidity ratio would be if the following quantities of air were mixed: 1000 ft3 at 80°F and 70% saturated and 2500 ft3 at 100°F dry bulb and 87°F wet bulb temperature. Show your answer in a psychrometric chart and be sure to turn in your chart. 13)
11.8 An air-water vapor mixture has a dry bulb temperature of 65.6℃ and a wet bulb...
11.8 An air-water vapor mixture has a dry bulb temperature of 65.6℃ and a wet bulb temperature of 32.2 C. What is the humidity of the mixture?
Exercise 3 Moist air at 1 atm. barometric pressure has a dry bulb temperature of 29...
Exercise 3 Moist air at 1 atm. barometric pressure has a dry bulb temperature of 29 C and a wet bulb temperature of 22°C. Using the psychrometric chart and the table for saturated vapor find the following air properties: Pr T- 40 a) the partial pressure of the water vapor b) humidity ratio c) relative humidity d) dew-point temperature e) specific volume ) enthalpy of moist air
Q 1: In an air conditioning system return air at 26°C dry-bulb temperature and 50% relative...
Q 1: In an air conditioning system return air at 26°C dry-bulb temperature and 50% relative humidity is mixed with outdoor ambient air at 34°C dry-bulb temperature and 60% relative humidity. The dry air mass flow rate of outdoor air is 30% of the supply air mass flow rate to the space. The pressure is constant at 101.3 kPa. Calculate (i) the enthalpy, (ii) the humidity ratio, and (ii) the dry-bulb temperature of the supply air. (i) Compare the results...
u ut slatept I. 5. A dehumidifier is used to extract excess moisture from the air inside a room with dimensions 8x6x3 m3. The room was initially at a dry bulb temperature of 30°C, 70% relative humidity and ends up to a wet bulb temperature of 11°C, 100% relative humidity. If the dry air density is 1.2 kg/m3, what mass of water vapour has been removed by the dehumidifier?
What would be the dry bulb temperature, wet bulb temperature, dew point, percent saturation, enthalpy and humidity ratio would be if the following quantities of air were mixed: 1000 ft3 at 80°F and 70% saturated and 2500 ft3 at 100°F dry bulb and 87°F wet bulb temperature. Show your answer in a psychrometric chart and be sure to turn in your chart. 13)
11.8 An air-water vapor mixture has a dry bulb temperature of 65.6℃ and a wet bulb temperature of 32.2 C. What is the humidity of the mixture?
Exercise 3 Moist air at 1 atm. barometric pressure has a dry bulb temperature of 29 C and a wet bulb temperature of 22°C. Using the psychrometric chart and the table for saturated vapor find the following air properties: Pr T- 40 a) the partial pressure of the water vapor b) humidity ratio c) relative humidity d) dew-point temperature e) specific volume ) enthalpy of moist air
Q 1: In an air conditioning system return air at 26°C dry-bulb temperature and 50% relative humidity is mixed with outdoor ambient air at 34°C dry-bulb temperature and 60% relative humidity. The dry air mass flow rate of outdoor air is 30% of the supply air mass flow rate to the space. The pressure is constant at 101.3 kPa. Calculate (i) the enthalpy, (ii) the humidity ratio, and (ii) the dry-bulb temperature of the supply air. (i) Compare the results...
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