Calculate Volumic Flow Rate for Air (kg/s) at 1 bar, 20 - 50°C

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Discussion Overview

The discussion revolves around calculating the volumic flow rate of air using the ideal gas law, with specific parameters including pressure, mass flow, and temperature conditions. The context includes theoretical and homework-related aspects of fluid dynamics and gas behavior.

Discussion Character

  • Homework-related
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant seeks assistance in calculating the volumic flow rate for air, providing specific parameters such as molar mass, pressure, mass flow, and temperature.
  • Another participant questions the appropriateness of posting homework questions in the current forum.
  • A participant asks for the density of air at 20°C and 50°C, referencing the ideal gas law.
  • One participant asserts that the density of air is 1000 kg/m³ based on the provided information.
  • Another participant challenges this claim, noting that 1000 kg/m³ is the density of water and emphasizes the need to apply the ideal gas law to determine the correct density of air under the specified conditions.

Areas of Agreement / Disagreement

Participants express disagreement regarding the density of air, with conflicting views on the correct application of the ideal gas law. The discussion remains unresolved as no consensus is reached on the density values.

Contextual Notes

There are limitations regarding the assumptions made about the density of air, as well as the need for clarification on the application of the ideal gas law under the given conditions.

Erdo
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Member warned about posting questions without the homework template
Hey guys,
can some of ou help me with this question:
I need to calculate the volumic flow rate for air by using the ideal gas law. Things i know from the assignment:

molarmass = 28,96 kg/kmol
Pressure = 1 bar
mass flow = 2 kg/s
t in = 20 degrees celsius
t out = 50 degrees celsius
(sorry for bad english, from denmark)
 
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PF asks that you post homework and other assignment questions to one of the HW forums.
 
From the ideal gas law, what is the density of the air at 20C? what is the density of the air at 50C?

Chet
 
Chestermiller said:
From the ideal gas law, what is the density of the air at 20C? what is the density of the air at 50C?

Chet
well jeg think it's 1000 kg/m^3, because nothing else is given.
 
Erdo said:
well jeg think it's 1000 kg/m^3, because nothing else is given.
That's some pretty dense air. A cubic meter of a-i-r has a mass of 1000 kg? Are you sure?
 
Erdo said:
well jeg think it's 1000 kg/m^3, because nothing else is given.
That's the density of water, not air. You need to use the ideal gas law to get the density of air under the process conditions.

Chet
 

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