I to be calculating it is provided air flow rate right into a zone because that an air conditioning system. The simulation software gives the result in m3/s however the math formula that I offered takes in kg/s.

You are watching: M3/s to kg/s

Do I need to convert the circulation rate, and also if so, just how do ns convert in between kg/s and also m3/s?


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You require to take into consideration the thickness of the air, i m sorry varies through temperature and also air pressure. In ~ 15 degrees Celsius, in ~ sea level, the density of air is 1.225 $kg/m^3$. The table here gives air densities in ~ 5 degree intervals.

Now thickness is mass split by volume,

$\\rho = m/v$

Hence, to get the volume flow rate (in $m^3/s$), for a recognize mass flow rate, divide the mass flow rate (in $kg/s$) through the density (in $kg/m^3$).

Thus, a flow rate that $1 kg/s$ is,

$1 / 1.225 = 0.8163 m^3/s$

To acquire the mass flow rate for a recognize volume circulation rate multiple the volume flow rate by the waiting density.


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edited Apr 21 \"15 at 13:48
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Trevor Archibald
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answer Apr 21 \"15 in ~ 4:59
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FredFred
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HVAC-Systems usually provide a Volume-Flow-Rate, thus $m^3/s$. If you need Mass-Flow-Rate ($kg/s$) you just need to multiply through the thickness ($\\rho$) the the fluid. The density can be calculated utilizing the ideal gas law (see 1):

$$ \\rho_s = \\fracp_sR T_s$$

Please observe that you need static values for the pressure ($p_s$, view 2) and temperature ($T_s$, check out 3). The specific gas constant ($R$, view 4) for air is depending on the humidity the the air but $287.058 J/kg/K$ is a an excellent starting point. For low velocities static and absolute values are so close to each various other that girlfriend should be able to use the absolute/ambient pressure and also Temperature. However, the density is changing with pressure and also temperature, neglecting either will decrease the accuracy of the measurement.

From my endure the HVAC system has a measurement-error ($5\\%$) i beg your pardon is larger than the error which is make by suspect static=total.

All values in SI units!


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edited Apr 21 \"15 at 5:30
answered Apr 21 \"15 in ~ 5:09
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Constant massive Flow:

$$ \\dotm = \\rho A V $$

(Hence mass flow is equal to density times area time velocity.

So assuming you have actually an area that $1$ m^2 with a velocity that $1$ m/s, air v a thickness of $1.225$ kg/m^3 will certainly equate to a mass flow of $1.225$ kg/s. For incompressible flows, the mass circulation rate is constant.


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answer Apr 21 \"15 at 16:42
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You need to understand that whilst the circulation rates might remain static, the mass will not be so because warmer air is lighter and also less thick whilst cool aircon wait is substantially heavier. The difference between them determines the power required to carry the waiting by the device to the zone her looking into.

The difference in calculations is to answer two various questions: power intake or airflow m^3 \\cdot s


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answer Jul 11 \"18 in ~ 2:09
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