1. ESS Cryogenic Distribution System for the Elliptical Linac SV calculation approach Preliminary Design Review Meeting, 20 May 2015, ESS, Lund, Sweden J. Polinski, Z Malecha

2. Modeled geometry L=200 m DN200 Q=5 kW/m2 Pset=2 bar a

3. Model Model includes the following governing equations: –Equation of state, –Mass balance, –Momentum balance (compressible N-S ), –Energy balance Boundary conditions: –At the pipe wall: T gradient =0 U=0 p gradient = 0 –SV outflow (L=0m) U gradient = 0 T gradient = 0 p out = 1 bar a –System symmetry at L=100m Calculation method (discretization) - Finite volume Solver - OpenFoam

4. Calculation results - SV d 0 =30mm

5. Calculation results - SV d 0 =40mm

6. Calculation results - SV d 0 =46mm

7. Next steps Introducing the real VLP geometry with respect of diameter change in CTL and SPK as well as the line routing in the CTL gallery (elbows, elevation change) Calculations of the other CDS lines