An air parcel consists of 400 g of dry air with temperature and pressure of 280...
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An air parcel consists of 400 g of dry air with temperature and
pressure of 280...
Let’s say we have a bound spherical parcel of dry air. Its pressure is 772 mb,...
Let’s say we have a bound spherical parcel of dry air. Its pressure is 772 mb, mass is 3.8 kg, and a spherical radius of 0.81 m. What is the temperature of this parcel?
A polytropic process for an ideal gas in one in which pressure and volume are related...
A polytropic process for an ideal gas in one in which pressure and volume are related by = const., where n is a constant. It is a generalization of the special processes considered earlier. Thus n = 0 defines an isobaric process, n = cp/cv an adiabatic process, n = 1 an isothermal process, and n = 8 an isochoric process. Suppose 1 kg of dry air at 280 K and 100 kPa undergoes a polytropic expansion in which the...
Air is trapped in a piston cylinder arrangement. The air expands from a temperature of 60...
Air is trapped in a piston cylinder arrangement. The air expands from a temperature of 60 C and a pressure of 280 KPa to a pressure of 140 KPa. During the process, 30 KJ/Kg of work is done and 14 KJ/Kg of heat is removed. The initial volume is 0.00878 m^3. a) What is the mass of the air? b) What is the temperature change during this process? c) What is the entropy change during this process? d) Does the...
Consider the expansion stroke only of a typical air-standard Diesel cycle engine which has a comp...
Consider the expansion stroke only of a typical air-standard Diesel cycle engine which has a compression ratio of 20 and a cutoff ratio of 2. At the beginning of the process (fuel injection) the air temperature is 627°C, and the air expands at a constant pressure of 6.2 MPa until cutoff (volume ratio 2:1). Subsequently the air expands adiabatically until it reaches the maximum volume. Using ideal gas properties of air at 1000K, determine the: (a) temperatures reached at the...
Exercise 2 Moist air at 1 atm. barometric pressure has a dry bulb temperature of 40°C...
Exercise 2 Moist air at 1 atm. barometric pressure has a dry bulb temperature of 40°C and a wet bulb temperature of 320C. Using both the equations for the moist air properties and the psychrometric chart find: g) the partial pressure of the water vapor h) humidity ratio i) relative humidity j) dew-point temperature k) specific volume 1) enthalpy of moist air Insert the data and the results from the chart in the following table: Enthalpy Specific kJ/kg m/kg Humidity...
5. Air expands isothermally constant temperature) in a closed, piston-cylinder device. The original state is given...
5. Air expands isothermally constant temperature) in a closed, piston-cylinder device. The original state is given by pı = 20 MPa, T = 1000 K. the process continues until the pressure drops to 2 MPa. The original volume of the air is V1 = 1 m². Determine the following: a. the mass of the air in the system, in kg. b. the final density of the air, in kg/m". Remember, Rair = 0.287 kJ/kg-K c. the final volume of the...
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.
400 moles of an ideal monatomic gas are kept in a cylinder fitted with a light...
400 moles of an ideal monatomic gas are kept in a cylinder fitted with a light frictionless piston. The gas is maintained at the atmospheric pressure. Heat is added to the gas. The gas consequently expands slowly from an initial volume of 10 m3 to 15 m3. (a) Draw a P-V diagram for this process. (b) Is this thermodynamic process an isothermal expansion, an isobaric expansion or an adiabatic expansion? (c) Calculate the work done by the gas. (d) Calculate...
1. For dry air at 1.0000 atm pressure, the densities at –50 C, 0 C, and...
1. For dry air at 1.0000 atm pressure, the densities at –50 C, 0 C, and 69 C are 1.5826 g dm–3, 1.2929 g dm–3, and 1.0322 g dm–3, respectively. a) Assume a sample of mass 1000 g, and calculate the volume at each temperature
Weather question. 4). Consider the mountain below. An air parcel at the western base of the...
Weather question.
4). Consider the mountain below. An air parcel at the western base of the mountain has a temperature of 22 C and a dewpoint of 17 C. As the air ascends and descends, it will either cool (or warm in the case of descent) at the dry adiabatic lapse rate of -10 C/km, or at the moist adiabatic lapse rate of -6 C/km. Remember, the equation for the lapse rate is SudT/dz. (T -Tita)/(z.-Z.). Answer the following questions....
Exercise 2 Moist air at 1 atm. barometric pressure has a dry bulb temperature of 40°C and a wet bulb temperature of 320C. Using both the equations for the moist air properties and the psychrometric chart find: g) the partial pressure of the water vapor h) humidity ratio i) relative humidity j) dew-point temperature k) specific volume 1) enthalpy of moist air Insert the data and the results from the chart in the following table: Enthalpy Specific kJ/kg m/kg Humidity...
5. Air expands isothermally constant temperature) in a closed, piston-cylinder device. The original state is given by pı = 20 MPa, T = 1000 K. the process continues until the pressure drops to 2 MPa. The original volume of the air is V1 = 1 m². Determine the following: a. the mass of the air in the system, in kg. b. the final density of the air, in kg/m". Remember, Rair = 0.287 kJ/kg-K c. the final volume of the...
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.
Weather question.
4). Consider the mountain below. An air parcel at the western base of the mountain has a temperature of 22 C and a dewpoint of 17 C. As the air ascends and descends, it will either cool (or warm in the case of descent) at the dry adiabatic lapse rate of -10 C/km, or at the moist adiabatic lapse rate of -6 C/km. Remember, the equation for the lapse rate is SudT/dz. (T -Tita)/(z.-Z.). Answer the following questions....
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