EBK THERMODYNAMICS: AN ENGINEERING APPR
8th Edition
ISBN: 8220100257056
Author: CENGEL
Publisher: YUZU
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Chapter 16.6, Problem 79P
(c)
To determine
The strong liquid mixture being pumped from the absorber.
(b)
To determine
The operating pressure in the absorber.
(d)
To determine
The weak liquid solution being drained from the generator.
(a)
To determine
The operating pressure in the generator.
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PROBLEM 6.18
Air at 90°C and 1.00 atm (absolute) contains 10.0 mole% water. A continuous stream of this air enters
a compressor-condenser, in which the temperature is lowered to 15.6°C and the pressure is raised to
3.00 atm. The air leaving the condenser is then heated isobarically to 100°C. Calculate the fraction of
water that is condensed from the air, the relative humidity of the air at 100°C, and the ratio m outlet
air @ 100°C /m feed air @ 90°C.
Solution
Basis: 1 mol feed. Since the problem statement asks us to calculate the ratio of the volumes of
feed air and exit air, we will label both volumes on the flowchart.
DA = dry air
Compressor
Heater
V1 (m³)
V2 (m³)
П2 (mol)
n2 (mol)
V2 (mol H20(v)/mol)
(1-y2) (mol DA/mol)
15.6°C, 3 a
1 mol
0.100 mol H2O(v)/mol
0.900 mol DA/mol
90°C, 1 atm
V2
(1-y2)
100 C, 3 atm
N3 [mol H2O(1)]
15.6°C, 3 atm
DEGREE-OF-FREEDOM ANALYSIS ON COMPRESSOR
UNKNOWNS AND INFORMATION
JUSTIFICATION/CONCLUSION
4 unknowns
(V1, n1, n2, y2)
2 balances
1…
3. A product having a moisture content of 60% (wet basis) is dried in a tunnel-type dryer at a rate of 10 kg / hr. The drying air is supplied at a rate of 2000 kg air / hour at 50 ° C and 10% RH, and the dryer exits at 25 ° C, and conditions of equilibrium with the product are at 40% RH. Determine the moisture content of the product leaving the dryer, as well as the water activity of the product. a. Product moisture content =% (wet basis). b. Water activity =
An aqua ammonia absorption plant operates between pressures at 206.8 and 1378 kPaa. The strongsolution enters the generator saturated at 82.2°C and the weak solution leaves the generator saturated at93.3°C. Saturated vapor leaves the generator with a concentration of 0.993 kg NH3 /kg mixture. Assuming thatthe strong solution leaving the absorber is saturated, neglecting pump work and heat losses, calculate perkg/min flow of refrigerant through the evaporator:a. the mass flow of strong solution entering the generator in kg/minb. the mass flow of weak solution leaving the generator in kg/minc. the enthalpy of the weak solution entering the absorber in kJ/kg weak solution and the heat rejected in the absorber in kW
Saturated liquid at 1378 kPaa and 82.2°C has a concentration of 0.46 kg NH3 /kg mixture and an enthalpy of209.2 kJ/kg of mixture, saturated liquid at 1378 kPaa and 93.3°C has a concentration of 0.41 kg NH3 /kg mixtureand an enthalpy of 255.68 kJ/kg of mixture, saturated liquid…
Chapter 16 Solutions
EBK THERMODYNAMICS: AN ENGINEERING APPR
Ch. 16.6 - Write three different KPrelations for reacting...Ch. 16.6 - A reaction chamber contains a mixture of CO2, CO,...Ch. 16.6 - A reaction chamber contains a mixture of N2and N...Ch. 16.6 - A reaction chamber contains a mixture of CO2, CO,...Ch. 16.6 - Which element is more likely to dissociate into...Ch. 16.6 - Prob. 6PCh. 16.6 - Prob. 7PCh. 16.6 - Prob. 8PCh. 16.6 - Prob. 9PCh. 16.6 - Prob. 10P
Ch. 16.6 - Prob. 11PCh. 16.6 - 16–12 Determine the temperature at which 5 percent...Ch. 16.6 - 16–12 Determine the temperature at which 5 percent...Ch. 16.6 - Prob. 14PCh. 16.6 - Prob. 15PCh. 16.6 - Prob. 16PCh. 16.6 - Prob. 17PCh. 16.6 - Prob. 18PCh. 16.6 - Prob. 19PCh. 16.6 - Prob. 20PCh. 16.6 - Prob. 21PCh. 16.6 - Determine the equilibrium constant KP for the...Ch. 16.6 - Prob. 24PCh. 16.6 - Carbon monoxide is burned with 100 percent excess...Ch. 16.6 - Prob. 27PCh. 16.6 - Prob. 28PCh. 16.6 - Prob. 29PCh. 16.6 - Prob. 30PCh. 16.6 - Prob. 31PCh. 16.6 - A mixture of 3 mol of N2, 1 mol of O2, and 0.1 mol...Ch. 16.6 - Prob. 33PCh. 16.6 - Prob. 34PCh. 16.6 - Prob. 35PCh. 16.6 - Prob. 37PCh. 16.6 - Estimate KP for the following equilibrium reaction...Ch. 16.6 - Prob. 40PCh. 16.6 - What is the equilibrium criterion for systems that...Ch. 16.6 - Prob. 42PCh. 16.6 - Prob. 43PCh. 16.6 - Prob. 44PCh. 16.6 - Prob. 48PCh. 16.6 - Prob. 51PCh. 16.6 - Prob. 52PCh. 16.6 - Prob. 53PCh. 16.6 - Prob. 54PCh. 16.6 - Prob. 55PCh. 16.6 - Prob. 56PCh. 16.6 - Prob. 57PCh. 16.6 - Prob. 59PCh. 16.6 - Prob. 60PCh. 16.6 - Prob. 61PCh. 16.6 - Prob. 62PCh. 16.6 - Using the Henrys constant data for a gas dissolved...Ch. 16.6 - Prob. 65PCh. 16.6 - Prob. 66PCh. 16.6 - Prob. 67PCh. 16.6 - Prob. 68PCh. 16.6 - Prob. 69PCh. 16.6 - Prob. 70PCh. 16.6 - Prob. 71PCh. 16.6 - Prob. 72PCh. 16.6 - An oxygennitrogen mixture consists of 30 kg of...Ch. 16.6 - Prob. 74PCh. 16.6 - Prob. 75PCh. 16.6 - Prob. 76PCh. 16.6 - Prob. 77PCh. 16.6 - An ammoniawater absorption refrigeration unit...Ch. 16.6 - Prob. 79PCh. 16.6 - Prob. 81PCh. 16.6 - Prob. 82PCh. 16.6 - Prob. 83RPCh. 16.6 - Prob. 84RPCh. 16.6 - Prob. 85RPCh. 16.6 - Consider a glass of water in a room at 25C and 100...Ch. 16.6 - Prob. 87RPCh. 16.6 - 16–90 Propane gas is burned steadily at 1 atm...Ch. 16.6 - Prob. 91RPCh. 16.6 - Prob. 92RPCh. 16.6 - Prob. 93RPCh. 16.6 - Prob. 94RPCh. 16.6 - Prob. 95RPCh. 16.6 - A constant-volume tank contains a mixture of 1 mol...Ch. 16.6 - Prob. 101RPCh. 16.6 - Prob. 103RPCh. 16.6 - Prob. 104RPCh. 16.6 - Prob. 107RPCh. 16.6 - Prob. 108RPCh. 16.6 - Prob. 109FEPCh. 16.6 - Prob. 110FEPCh. 16.6 - Prob. 111FEPCh. 16.6 - Prob. 112FEPCh. 16.6 - Prob. 113FEPCh. 16.6 - Prob. 114FEPCh. 16.6 - Propane C3H8 is burned with air, and the...Ch. 16.6 - Prob. 116FEPCh. 16.6 - Prob. 117FEPCh. 16.6 - The solubility of nitrogen gas in rubber at 25C is...
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