ok...here's the problem,..I can't s
ok...here's the problem,..I can't s
(OP)
ok...here's the problem,..I can't seem to get my units
to equal out - I'm overlooking something:
Qt = F.Cp.(T1-T2)+ F.Jc.W2.Y + Qm + Qw
Qt: Total Energy (heat)
F: flow rate
Cp: specific heat of product
T1/T2: temperatures in and out
Jc: Latent heat of crystallization
W2: Solid fat content at exit (unitless)
Y: Fat Content of emulsion (unitless)
Qm: Energy transfer from shaft
Qw: Energy transfer from water
Your help is appreciated!!! :)
to equal out - I'm overlooking something:
Qt = F.Cp.(T1-T2)+ F.Jc.W2.Y + Qm + Qw
Qt: Total Energy (heat)
F: flow rate
Cp: specific heat of product
T1/T2: temperatures in and out
Jc: Latent heat of crystallization
W2: Solid fat content at exit (unitless)
Y: Fat Content of emulsion (unitless)
Qm: Energy transfer from shaft
Qw: Energy transfer from water
Your help is appreciated!!! :)





RE: ok...here's the problem,..I can't s
TTFN
RE: ok...here's the problem,..I can't s
I suggest you put down the units for everything - kg, kg/sec, and so on. What is "total energy" exactly - a heat transfer rate or an absolute energy measurement.
Should you be using heat capacity (kJ/kg-degree) instead of specific heat, which is dimensionless?
Cheers,
John.
RE: ok...here's the problem,..I can't s
RE: ok...here's the problem,..I can't s
Now just make sure each constant and independant is in the same system and every thing should work out.
The only thing is: remember that fat and liquid may have different heat capacities and this should be considered for T_sp to T2
T_sp=temp of solification
Best Regards
Morten
RE: ok...here's the problem,..I can't s
m/s................F: flow rate
joules/kg.Kelvin...Cp: specific heat of product
Kelvin.............T1/T2: temperatures in and out
J/kg...............Jc: Latent heat of crystallization
...................W2: Solid fat content at exit (unitless)
...................Y: Fat Content of emulsion (unitless)
joules.............Qm: Energy transfer from shaft
joules.............Qw: Energy transfer from water
To clarify, these are the units I am using for the equation - and it isn't working out....
RE: ok...here's the problem,..I can't s
Qs are expressed in energy units (joule) as if we model a non-flow system. But, on the other hand, you use F as a flow , so the inconsistency is between
energy terms (Qm. Qt, Qs) and power terms (F.cp... and F.Jc...)
So, please, express you heat as a flow (in watt or joule/hr or kcal / H ).
Adittionally, your F must be expressed in kg/hr , according to the units in Latent heat and heat capacity
Regards
RE: ok...here's the problem,..I can't s