Answer :
Remember to use the appropriate equations, constants, and tables to perform the calculations accurately.
Question 1:
(a) To calculate the specific humidity of the mixture stream, we need to determine the mass of water vapor in the air.
- For the first air stream:
- Given: mass of air = 2 kg, relative humidity (RH) = 80%
- We can use a psychrometric chart or equation to find the mass of water vapor in the air. Let's assume it is m1 kg.
- For the second air stream:
- Given: mass of air = 4 kg, relative humidity (RH) = 20%
- Similar to the previous step, let's assume the mass of water vapor in the air is m2 kg.
- Now, we can calculate the total mass of water vapor in the mixture stream using the conservation of mass principle:
- Total mass of water vapor = m1 + m2 kg.
- Finally, the specific humidity is given by the ratio of the mass of water vapor to the total mass of air in the mixture stream:
- Specific humidity = Total mass of water vapor / (Total mass of air in the mixture stream).
(b) To calculate the temperature of the mixture stream, we can apply the principle of conservation of energy since the mixing process is adiabatic (no heat exchange with the surroundings).
- We can use the specific heat capacity of air to find the final temperature of the mixture stream.
(c) To calculate the relative humidity of the mixture stream, we need to determine the vapor pressure and the saturation vapor pressure at the final temperature.
- The relative humidity is then given by the ratio of the vapor pressure to the saturation vapor pressure, multiplied by 100.
Now, let's move on to Question 2:
- To calculate the air-fuel ratio for the combustion, we need to determine the masses of air and propane in the mixture.
- Given: mass of propane = 0.022 kg, weight percent of excess air = 15%
- We can calculate the mass of air required for complete combustion using stoichiometry.
- The air-fuel ratio is then given by the ratio of the mass of air to the mass of propane.
- To calculate the dew point of the vapor, we need to determine the partial pressure of water vapor in the mixture and compare it to the saturation vapor pressure at the given temperature and pressure.
- We can use the Antoine equation or other appropriate methods to calculate the dew point temperature.
Learn more about equations in the link:
https://brainly.com/question/29174899
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