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2. Suppose liquid n-heptane is in contact with its saturated vapor at 185°C and 14 bar....
In a vapor-compression refrigeration cycle, ammonia exits the evaporator as saturated vapor at -22 °C. There...
In a vapor-compression refrigeration cycle, ammonia exits the
evaporator as saturated vapor at -22 °C. There are
irreversibilities in the compressor. The refrigerant enters the
condenser at 16 bar and 160 °C, and saturated liquid exits at 16
bar. There is no significant heat transfer between the compressor
and its surroundings, and the refrigerant passes through the
evaporator with a negligible change in pressure.
Calculate the coefficient of performance, b, and the isentropic
compressor efficiency, defined as:
2s Condenser Expansion...
n-butane is added to gasoline to help control its vapor pressure so that the gasoline performs...
n-butane is added to gasoline to help control its vapor pressure so that the gasoline performs optimally at both hot and cold ambient temperatures. A vapor mixture of 50 mol% n-butane (p* = 5 bar) and 50 mol% n-heptane (p* = 2 bar) is at low pressure. The mixture is partially condensed by isothermally raising the pressure to 4 bar. Which statement is correct? Why? A. n-butane is enriched in the liquid phase B. n-heptane is enriched in the liquid...
. Calculate the molar volume of saturated liquid and the molar volume of saturated vapor by...
. Calculate the molar volume of saturated liquid and the molar volume of saturated vapor by the Redlich / Kwong equation for Propane at 400C (313.15 K) where P sat = 13.71 bar and compare results with values found by suitable generalized correlations. (Ans. For saturated liquid: Z= 0.057; V = 108.1 cm3/mol; For saturated vapor: Z= 0.789; V = 1499.2 cm3/mol)
3. The vapor pressure of liquid ethanol at 126°C is 505 kPa and its second virial...
3. The vapor pressure of liquid ethanol at 126°C is 505 kPa and its second virial coefficient at this temperature is - 523 cm /mol. Here, use the virial equation of state with an expansion in 1/V (as in problem #1). a. Calculate the fugacity of ethanol vapor at saturation at 126°C assuming ethanol is an ideal gas. b. Calculate the fugacity of ethanol vapor at saturation at 126°C assuming ethanol is described by the virial equation of state truncated...
N-Heptane / Cycloheptane Separation. A saturated liquid feed of 600 mol/hr containing 54 mole % n-heptane...
N-Heptane / Cycloheptane Separation. A saturated liquid feed of 600 mol/hr containing 54 mole % n-heptane is to be fractionated at 101.325kPa (abs) in order to form a distillate containing 94 mole % n-heptane and a bottoms product of 10 mole % cycloheptane. Assume Raoult’s Law behavior applies (calculated results provided). The distillate reflux ratio to be used is 8:1. a) Calculate the flowrates (mol/hr) of the distillate and bottoms. b) Determine the minimum reflux ratio, RMIN and the minimum...
Problem-3 (200) In a vapor-compression refrigeration cycle, R134a exits the evaporator as saturated vapor at -32°C....
Problem-3 (200) In a vapor-compression refrigeration cycle, R134a exits the evaporator as saturated vapor at -32°C. The refrigerant enters the condenser at 14 bar and 170°C, and saturated liquid exits at 14 bar. There is no significant heat transfer between the compressor and its surroundings, and the refrigerant passes through the evaporator with a negligible change in pressure. If the mass flow rate is 2.987 kg/s, determine (a) Refrigeration capacity in KW (100) (b) The power input to the compressor,...
For a system of n-heptane and n-octane at 1atm: a) Calculate the dewpoint temperature for vapor...
For a system of n-heptane and n-octane at 1atm: a) Calculate the dewpoint temperature for vapor mole fractions of n-heptane at 0, 0.2, 0.4, 0.6, 0.8, 1.0. Briefly explain how the calculations was carried out. b) Calculate the bubble temperature for liquid mole fractions of n-heptane at 0, 0.2, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0. Briefly explain how the calculations was carried out. (You do not need to show working for every mole fraction, show the formula used and...
c) What are the qualities x for saturated liquid and saturated vapor, respectively?
c) What are the qualities x for saturated liquid and saturated vapor, respectively?
A mixture of 100 mol containing 60 mol% n-pentane and 40 mol% n-heptane is vaporized at...
A mixture of 100 mol containing 60 mol% n-pentane and 40 mol% n-heptane is vaporized at 101.325 kPa abs pressure until 40 mol of vapor and 60 mol of liquid in equilibrium with each other are produced. This occurs in a single-stage system and the vapor and liquid are kept in contact with each other until the vaporization is complete. Calculate the composition of the vapor and liquid. The equilibrium data are as follows, where x and y aremole fractions...
Water is the working fluid in a Carnot vapor power cycle. Saturated liquid enters the boiler...
Water is the working fluid in a Carnot vapor power cycle.
Saturated liquid enters the boiler at a pressure of 160 bar, and
saturated vapor enters the turbine. The condenser pressure is 0.08
bar. Determine
(a) the thermal efficiency.
(b) the back work ratio.
(c) the heat transfer to the working fluid per
unit mass passing through boiler, in kJ/kg.
(d) the heat transfer from the working fluid per
unit mass passing through the condenser, in kJ/kg.
Problem 8.03 Water...
In a vapor-compression refrigeration cycle, ammonia exits the
evaporator as saturated vapor at -22 °C. There are
irreversibilities in the compressor. The refrigerant enters the
condenser at 16 bar and 160 °C, and saturated liquid exits at 16
bar. There is no significant heat transfer between the compressor
and its surroundings, and the refrigerant passes through the
evaporator with a negligible change in pressure.
Calculate the coefficient of performance, b, and the isentropic
compressor efficiency, defined as:
2s Condenser Expansion...
3. The vapor pressure of liquid ethanol at 126°C is 505 kPa and its second virial coefficient at this temperature is - 523 cm /mol. Here, use the virial equation of state with an expansion in 1/V (as in problem #1). a. Calculate the fugacity of ethanol vapor at saturation at 126°C assuming ethanol is an ideal gas. b. Calculate the fugacity of ethanol vapor at saturation at 126°C assuming ethanol is described by the virial equation of state truncated...
Problem-3 (200) In a vapor-compression refrigeration cycle, R134a exits the evaporator as saturated vapor at -32°C. The refrigerant enters the condenser at 14 bar and 170°C, and saturated liquid exits at 14 bar. There is no significant heat transfer between the compressor and its surroundings, and the refrigerant passes through the evaporator with a negligible change in pressure. If the mass flow rate is 2.987 kg/s, determine (a) Refrigeration capacity in KW (100) (b) The power input to the compressor,...
Water is the working fluid in a Carnot vapor power cycle.
Saturated liquid enters the boiler at a pressure of 160 bar, and
saturated vapor enters the turbine. The condenser pressure is 0.08
bar. Determine
(a) the thermal efficiency.
(b) the back work ratio.
(c) the heat transfer to the working fluid per
unit mass passing through boiler, in kJ/kg.
(d) the heat transfer from the working fluid per
unit mass passing through the condenser, in kJ/kg.
Problem 8.03 Water...
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