modelSteamPipe
Extends from Models.SteamPipe (Detailed thermal advection model with thermal expansion effects using IF97 water vapour).
Information
After the initial transient has settled down, the step change of the specific enthalpy at the inlet is propagated to the outlet at a velocity roughly equal to that of the fluid. The outlet specific enthalpy is approximately equal to the inlet enthalpy delayed by the ratio tau between the total mass and the mass flow rate. There is a significant effect of numerical diffusion even for large values of N.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Integer | N (from SteamPipe) | 10 | Number of nodes |
| SI.Volume | Vtot (from SteamPipe) | 1 | Total volume |
| Real | w_nom (from SteamPipe) | 2 | Nominal mass flow rate |
| Real | dp_nom (from SteamPipe) | 1e5 | Nominal total pressure loss at full flow rate |
| Real | p_nom (from SteamPipe) | 10e5 | Nominal pressure at outlet |
| Real | h_nom (from SteamPipe) | 3.1e6 | Nominal specific enthalpy |
| SI.Pressure | p_start (from SteamPipe) | p_nom | Initial value of pressure states |
| SI.SpecificEnthalpy | h_start (from SteamPipe) | h_nom | Initial value of enthalpy states |
| Real | kf (from SteamPipe) | w_nom/(dp_nom/N) | Friction coefficient |
| SI.Volume | V (from SteamPipe) | Vtot/N | Total volume |
| SI.Density | rho_av (from SteamPipe) | Medium.density_ph(p_nom + dp_nom/2, h_nom) | Average density |
| SI.Time | tau (from SteamPipe) | Vtot*rho_av/w_nom | Estimated transport delay at nominal conditions |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| SI.MassFlowRate | w_in_pipe (from SteamPipe) | 0 + (if time > 1 then w_nom else 0) | Inlet mass flow rate |
| SI.SpecificEnthalpy | h_in_pipe (from SteamPipe) | h_nom + (if time > 10 then 5000 else 0) | Inlet specific enthalpy |
| SI.Mass[N] | M (from SteamPipe) | Fluid mass within each volume | |
| SI.Energy[N] | E (from SteamPipe) | Fluid internal energy within each volume | |
| SI.MassFlowRate[N] | w_in (from SteamPipe) | Inlet flow rate of each volume | |
| SI.MassFlowRate[N] | w_out (from SteamPipe) | Outlet flow rate of each volume | |
| SI.Pressure[N] | p (from SteamPipe) | Pressure states | |
| SI.SpecificEnthalpy[N] | h (from SteamPipe) | Specific enthalpy states | |
| SI.SpecificEnthalpy[N] | h_in (from SteamPipe) | Inlet specific enthalpy of each volume | |
| SI.SpecificEnthalpy[N] | h_out (from SteamPipe) | Outlet specific enthalpy of each volume | |
| SI.Density[N] | rho (from SteamPipe) | Volume density | |
| Medium.ThermodynamicState[N] | state (from SteamPipe) | Volume thermodynamic state | |
| SI.Pressure | p_in_pipe (from SteamPipe) | Inlet pressure | |
| SI.Pressure | p_out_pipe (from SteamPipe) | Outlet pressure | |
| SI.MassFlowRate | w_out_pipe (from SteamPipe) | Inlet flow rate | |
| SI.SpecificEnthalpy | h_out_pipe (from SteamPipe) | Outlet flow rate | |
| Medium.SpecificEnthalpy | h_out_pipe_th | delay(h_in_pipe, tau) |