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Appendix G – Application of a Movable Insulating Plate in DHW Tanks Table G1 The thermal conductivity of selected solid insulators and water at 40oC. Thermal Conductivity Fluid / Material Water at 40oC Extruded polystyrene (XPS) Cork Cellular glass [W/(mK)] 0.628 0.030 – 0.040 0.045 – 0.060 0.055 – 0.070 [%] 100 5 – 6 7 – 10 9 – 11 Since the use of XPS will lead to roughly 35 to 45% lower heat flux in comparison with cork and cellular glass, XPS appears as a promising material for a movable insulating plate. However, XPS can only be used in DHW systems with storage temperatures below 75oC. Figure G2 shows the marginal percentage reduction in the unit thermal conductance and the consequent reduction in the heat flux through an XPS plate, when increasing the plate thickness from 5 to 250 mm. The thermal conductivity of the insulating plate is 0.035 W/(m2K). 100 90 80 70 60 50 0 50 100 150 200 250 Plate Thickness [mm] Figure G2 The calculated marginal percentage reduction in the heat flux through a XPS plate as a function of the plate thick- ness. The reference thickness is 5 mm. G3 Percentage Reduction {%]PDF Image | Residential CO2 Heat Pump System for Combined
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