Thermodynamics - Mass Flow Rate

In summary, the problem involves steam at 30 bar and 280C being throttled to 20 bar and mixed with liquid water at 25 bar and 20C to produce saturated steam at 20 bar. The mass flow rate of the liquid water is equal to the flow rate of steam into the system. The challenge is setting up the initial equation and correctly representing the states on a P-v diagram. Assistance with this problem is requested.
  • #1
crazyhawaiian
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Homework Statement



Steam at 30 bar and 280C flowing steadily at 20,000 kg/hr is throttled to 20 bar. A
separate stream of liquid water at 25 bar and 20C is throttled to 20 bar. Steam and liquid
water are mixed in a mixing chamber so as to produce saturated steam at 20 bar.
(a) What is the mass flow rate (kg/hr) of liquid water?
(b) Show all the states in the system correctly on P-v digram.

The Attempt at a Solution



I am having some difficulty with thermo. I believe the flow rate of the water is supposed to match the flow of steam into the system although I don't know how to set up the initial equation.
 
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  • #2
I'm also not sure how to calculate the states in the system and include them on the P-v diagram. Any help is appreciated.
 

FAQ: Thermodynamics - Mass Flow Rate

What is mass flow rate in thermodynamics?

Mass flow rate in thermodynamics is the measurement of how much mass is moving through a system per unit of time. It is typically measured in kilograms per second (kg/s).

How is mass flow rate related to thermodynamics?

Mass flow rate is an important concept in thermodynamics because it is used to determine the rate at which energy is transferred through a system. This allows scientists to analyze and understand the efficiency of various thermodynamic processes.

What factors affect mass flow rate in thermodynamics?

The main factors that affect mass flow rate in thermodynamics are the size and design of the system, the temperature and pressure of the fluid, and the properties of the fluid itself (such as density and viscosity).

How is mass flow rate calculated?

The mass flow rate can be calculated by dividing the mass of the fluid passing through a specific point in the system by the time it takes to pass through that point. This can be represented by the equation: mass flow rate = mass / time.

Why is mass flow rate important in thermodynamics research?

Mass flow rate is important in thermodynamics research because it allows scientists to understand and analyze the efficiency of various thermodynamic processes. It is also used in the design and optimization of systems to ensure maximum energy transfer and efficiency.

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