Residential CO2 Heat Pump System for Combined

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Residential CO2 Heat Pump System for Combined ( residential-co2-heat-pump-system-combined )

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contact surface movable insulating plate (ρIP) H1 H2 H3 3 – Theoretical Background and System Analysis where g is the acceleration due to gravity, p is the static pressure in the tank, ρ is the density of the hot and cold water, ρIP is the average density of the insulating plate and H are the heights as illustrated in Figure 3.30. hot water (ρ1) p + ρ1·g·H1 ρIP·g·(H2+H3) p+ρ1·g·(H1+H2)+ρ2·g·H3 cold water (ρ2) Figure 3.30 Principle of the hydrostatic force balance of a movable insulating plate in a circular DHW tank. With reference to Eq. (3.31), the underside of the insulating plate will be located at the contact surface between the water reservoirs (i.e. H3→0) when the average density of the plate (ρIP) approaches the density of the DHW (ρ1). On the other hand, when the average density of the plate approaches the density of the cold water (ρ2), the upper side of the plate will be located at the contact surface (i.e. H2→0). The diameter of the insulating plate should be roughly 5 to 10 mm less than the inner diameter of the DHW tank in order to avoid undesirable friction forces between the plate and the tank wall, which could alter the hydrostatic balance of the plate. When the plate reaches the top or bottom position in the tank during the tapping and charging periods, the water can flow freely through the cylindrical gap. Figure 3.31 shows the fundamental function of the movable insulating plate during the tapping and charging modes. 63

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Residential CO2 Heat Pump System for Combined

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