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Thermodynamics
Engineering Thermodynamics
152 SOLVED PROBLEMS
Question: 2.1
During testing, compressed air from a cylinder is used to inflate an inelastic flexible fire hose, originally folded completely flat, to a volume 0.48 m³. If the barometer reads 749 mm Hg, what is the amount of work done upon the atmosphere by the fire hose? ...
Verified Answer:
The displacement work,
W = W_{cyl}+ W_{hos...
Question: 14.7
A mixture of benzene gas with 60 % excess air contained in a constant-volume tank undergoes the combustion. Determine the net heat transfer. Product-temperature is 1,000 K. Use the data given below: ...
Verified Answer:
Given: (1) Combustion reactants: Air and benzene, ...
Question: 14.6
Find out the heat generated by burning of n-Octane for a product temperature of 257°C (530 K) without excess air supply. ...
Verified Answer:
Given: Combustion reactants: Air and n-octane Find...
Question: 14.5
Repeat Example 14.4 if the burning takes place with 80% excess air. ...
Verified Answer:
The excess air, i.e. 80% or 0.8 will be the surplu...
Question: 14.4
Determine the mass and mole fraction of CO2 and water-vapour if C3H8 is burned with theoretical amount of air. ...
Verified Answer:
Given: Combustion reactants: Air and
C_3H_8...
Question: 14.3
Determine the air-fuel ratio for the complete combustion of C8H18 with theoretical amount of air. ...
Verified Answer:
Given: Reactants—Air and
C_8H_{18}
...
Question: 14.2
Chemical reaction, C(s) + O2 (g) → CO2 (g) at 25°C and 1 atm releases –17.9 kcal of heat, if temperature of outlet, i.e. CO2 is kept constant at 25°C and 1 atm respectively. Calculate the enthalpy of formation for CO2. Using the value of enthalpy of formation for CO2, find out the enthalpy of ...
Verified Answer:
Given, 1. For
CO_2
formation, hea...
Question: 14.1
For a chemical reaction H2 + I2 → 2HI, Find out the equilibrium constant at 426°C, if concentrations of H2, I2, HI are respectively 0.0037 mol/L, 0.0037 mol/L and 0.0276 mol/L at equilibrium (at 426°C). Also, find the equilibrium constant for the reverse equation. ...
Verified Answer:
Given,
[HI] = 0.0276 mol/L, [H_2] = 0.003...
Question: 13.6
It is required to design an air-conditioning system for an industrial process for the following hot and wet summer conditions: Outdoor conditions—32°C DBT and 65% RH. Required air inlet conditions—25°C DBT and 60% RH. Amount of free air circulated—250 m³/min Coil dew temperature—13°C. The ...
Verified Answer:
Step 1: Draw the psychrometric chart. Step 2: By u...
Question: 13.5
It is required to design an air-conditioning system for an industrial process for the following hot and wet summer conditions: Outdoor conditions—34°C DBT and 70% R.H. Required air inlet conditions—25°C DBT and 65% R.H. Amount of free air circulated—5 m³/s Coil dew temperature—15°C. The ...
Verified Answer:
Step 1: Draw the psychrometric chart. Step 2: By u...
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