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♦ The ♦ The ♦ The ♦ The ♦ The tank dimensions (diameters, height) average U-value of the tank ambient air temperature number of nodes initial temperature profile for the water (separate def-file) 6.2.2.5 Verification of the Tank Model The tank model was verified by means of experimental data from the DHW tank test rig (ref. Section 5.2). Uniform Initial Hot Water Temperature In the tank model, the 200 litre DHW tank (ID 500 mm, H 1020 mm) was divided into 200 nodes, which corresponded to a node distance of 5 mm and a water volume of 1 litre for each node. By using the measured initial temperatures for the water (56.2oC) and the ambient air (22oC), the simu- lated temperature drop at varying U-values was compared with the mea- sured temperature drop. The simulated and the measured temperatures in the tank were identical at a U-value of 1.05 W/m2K. When neglecting the thermal resistance in the water and the thermal resistance between the water and the inner tank wall, this U-value corresponded to 40 mm glass- wool insulation (k=0.043 W/(mK)) and a convective heat transfer coeffi- cient between the outer tank wall and the ambient air of 10 W/m2K. 6 – Modelling were included in the NMF file, whereas the IDA file contained the input parameters, the simulation conditions and the description of the output data files. The NMF file was translated to C/C++ and subsequently to a DLL format (Dynamic Linkable Library) by the IDA NMF Translator. The DLL file was then treated by the IDA Solver simulation tool, which solved the differential equations and calculated the node temperatures. The NMF and IDA files as well as the procedure for establishing, converting and running the files are presented in Appendix I, The Transient Two-Dimensional Tank Model. The input parameters for the tank model were as follows: 197PDF Image | Residential CO2 Heat Pump System for Combined
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