Contents

CapTube1_CL

CapTube1_CL determines the mass flow rate through a capillary tube using the empirical relation published in the ASHRAE 2014 Refrigeration Handbook, Chapter 11, Capillary Tubes.

Inputs:

R\$:  name of the refrigerant

d:   inner diameter of the capillary tube (m, ft)

L:   length of the capillary tube (m, ft)

P_in:  pressure at the capillary tube inlet (Pa, kPa, MPa, bar, psia, atm)

h_in:  specific enthalpy at the capillary tube inlet (J/kg, kJ/kg, Btu/lbm)

Output:

m_dot:  mass flow rate (kg/s, lbm/hr)

Example:

\$UnitSystem SI C kPa kJ mass

\$VarInfo h_in units=kJ/kg

\$VarInfo m_dot_hr units=kg/hr

\$VarInfo m_dot units=kg/s

\$VarInfo T_sat units=C

R\$='R134a'

d=1.1 [mm]*convert(mm,m)

L=3.0 [m]

P_in=1.4 [MPa]*convert(MPa,kPa)

T_sat=temperature(R\$,P=P_in,x=0)

DELTAT_sc=15 [DELTAK]

h_in=enthalpy(R\$,P=P_in, T=T_sat-DELTAT_sc)

Call captube1_cl(R\$,d, L, P_in, h_in : m_dot)

m_dot_hr=m_dot*convert(kg/s,kg/hr)

{Solution:

m_dot=0.0042 [kg/s]

m_dot_hr=15.12 [kg/hr]

}