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Appendix I – The Transient Two-Dimensional Tank Model Appendix I The Transient Two-Dimensional Tank Model Reference is made to Section 6.2, Modelling of Single-Shell Cylindrical DHW Tanks, for a detailed description of the transient two-dimensional heat conduction model, also termed the tank model. I1 The NMF1 File for the Tank Model CONTINUOUS_MODEL Conduct ABSTRACT "Calculation of the transient temperature development (static thermocline) of water in circular DHW tanks. The transient, two-dimensional conduction model (tank model) includes conductive heat transfer inside the tank and between the ambient air and the water. The initial temperature profile is set by the user. The thermophysical properties of water (cp, ρ and k), which are from RnLib (2003), are calculated as temperature dependent functions of first and second order.” EQUATIONS /* Energy balance for each node - axial and radial heat transfer included */ FOR i=1,n IF i==1 then (AT-T[1]) * (U*PI*(Di**2)/4 + PI*Dy*dx*U) ELSE ((PI*(Di**2)/4)*(0.0013*T[i]+0.5731)/dx)*(T[i-1]-T[i]) END_IF + IF i==n then (AT-T[n]) * (U*PI*(Di**2)/4 + PI*Dy*dx*U) ELSE ((PI*(Di**2)/4)*(0.0013*T[i]+0.5731)/dx)*(T[i+1]-T[i])+ PI*Dy*dx*U*(A T-T[i]) END_IF = ((PI*(Di**2)/4)*(-0.3975*T[i]+1006)*(0.0144*(T[i]**2)- 1.2066*T[i]+4202.6*)*dx)*T'[i] END_FOR; 1 Neutral Model Format (Sahlin, 1996) I1PDF Image | Residential CO2 Heat Pump System for Combined
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CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
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