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?
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.
boost this price
edited Apr 21 \"15 at 13:48
2,79922 yellow badges1111 silver badges2424 bronze title
answer Apr 21 \"15 in ~ 4:59
8,99088 gold badges2626 silver- badges4242 bronze title
include a comment |
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!
boost this answer
edited Apr 21 \"15 at 5:30
answered Apr 21 \"15 in ~ 5:09
1,18277 silver badges2424 bronze badges
add a comment |
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.
enhance this price
answer Apr 21 \"15 at 16:42
94066 silver badges1111 bronze title
include a comment |
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
improve this price
answer Jul 11 \"18 in ~ 2:09
82433 silver- badges1313 bronze title
add a comment |
Thanks because that contributing solution to naipublishers.com ridge Exchange!Please be certain to answer the question. Provide details and share your research!
But avoid …Asking because that help, clarification, or responding to other answers.Making statements based on opinion; ago them increase with referrals or personal experience.
Use MathJax to style equations. MathJax reference.
To learn more, view our tips on writing good answers.
See more: Punch The Keys For Gods Sake !, Punch The Keys For God'S Sake!
Sign increase or log in in
authorize up using Google
authorize up making use of Facebook
sign up utilizing Email and also Password
Post together a guest
email Required, but never shown
Post as a guest
Required, however never shown
short article Your answer Discard
Not the prize you're feather for? Browse various other questions tagged mechanical-naipublishers.com hvac airflow or ask your very own question.
The Overflow Blog
Featured on Meta
waiting Conditioning modes of fail
Calculating kWh for various timestep
just how do I transform cubic metres/feet every minute to a pounds every hour circulation rate?
makeup Air Gas Burner
just how to intake moist air without heat backflow in evaporative cooling system?
deserve to air flow occur in both direction in a 2 means solenoid valve?
Angular Velocity and also Flow price Relationship Of wind turbine
warm Network inquiries more hot concerns
subscribe to RSS
inquiry feed To subscribe to this RSS feed, copy and also paste this URL right into your RSS reader.
ridge Exchange Network
site style / logo © 2021 stack Exchange Inc; user contributions licensed under cc by-sa. Rev2021.9.22.40281