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Appendix I – The Transient Two-Dimensional Tank Model I2 The IDA2 File for the Tank Model 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. The output files display the transient temperature profiles in the DHW tank as a function of the time t. The variables and the input parameters are as follows: T[n], Ta, Tb AT Qa, Qb U Di Dy H n dx The water in the rature profile (def-file) supplied by the user” ! Name of the output file (print-file) FILES OUTPUT OUTPUT1 PATH DHW70_10.PRN END_FILES ! Input parameters for the module MODULES MODULE Water TYPE Conduct n 200 AT 20 Di 0.50 Dy 0.58 H 1.02 U 1.05 END_MODULES 2 Equa Simulation Technology Group (1996) Water temperatures [°C] Ambient air temperature [°C] Heat flux from side a and b [W] U-value for the tank walls, ref. Dy [W/m2K] Inner diameter of the DHW tank [m] Outside diameter of the DHW tank [m] Height of the DHW tank [m] Number of nodes [-] Node distance = H/n [m] DHW tank is treated as a single element with an initial tempe- I3PDF 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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