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Appendix G – Application of a Movable Insulating Plate in DHW Tanks During the tapping period, cold water flows into the DHW tank below the insulating plate. Depending of the design of the inlet pipeline and diffuser, some of the dissolved air in the water will form air bubbles of various sizes at the underside of the plate. Since the bubbles are attached to the surface, they will create an undesirable buoyancy force that will alter the hydrostatic balance of the plate. This problem can be solved, for instance by designing the underside of the plate with a conical shape, and applying a non-wetting surface coating, i.e. a coating that leads to a small contact angle α for the bubbles. Due to the buoyancy force and the slippery sur- face, the bubbles will slide towards the cylindrical gap between the plate and the tank wall and rise quickly to the top of the tank. Figure G3 shows the principle of water bubbles on non-wetting and wetting surfaces, whereas Figure G4 presents a possible design for a movable insulating plate equipped with a conical balancing weight. a) α b) Principle of water bubbles on a non-wetting (a) and a wetting (b) surface. α is the contact angle of the bubbles. Tank wall 5 mm gap Insulating plate Balancing weight Possible design of a movable insulating plate equipped with a balancing weight. α Figure G3 Figure G4 The conical shape and the placement of the balancing weight are favourable for the hydrodynamic stability of the insulating plate, since the centre of gravity will be below the underside of the insulating plate. However, higher thermal performance will be achieved if the balancing weight is placed at the top of the insulating plate since the cold city water will not be heated by the balancing weight. G5PDF Image | Residential CO2 Heat Pump System for Combined
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