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Appendix G – Application of a Movable Insulating Plate in DHW Tanks Appendix G Application of a Movable Insulating Plate in Cylindrical Single-Shell DHW Tanks One way to reduce the internal conductive heat transfer and more or less eliminate the mixing in cylindrical single-shell DHW storage tanks, is to separate the hot and cold water volumes by means of a plate with low thermal conductivity – a so called movable insulating plate (ref. Section 3.3.4, Application of a Movable Insulating Plate Inside the DHW Tank). G1 Design of the Balancing Weight Since the density of the solid insulators of current interest presented in Table G1 on page G3 is in the order of 5 to 50 times lower than that of water, the buoyancy effect will force the insulating plate upwards when the plate is submerged in water. The resulting buoyancy force F on a submerged plate is calculated as: F≈(ρW −ρIP)⋅g⋅V (G1) where V is the volume of the plate, g is the acceleration due to gravity and the subscripts W and IP refer to the water and the plate, respectively. Since the average density of the insulating plate should be lower than that of the city water and higher than that of the hot water, an extra weight has to be attached to the plate in order to counterbalance the buoyancy force. The required mass of the balancing weight (MBW) is calculated on the basis of the mass of the insulating plate (MIP), the density of water (ρW) at an intermediate temperature (e.g. 35-40oC), and the volumes of the insulating plate (VIP) and the balancing weight (VBW): MBW =(VIP+VBW)⋅ρW−MIP (G2) where the subscripts BW and IP refer to the balancing weight and the insulating plate, respectively. As an example, a 50 mm XPS plate having a diameter of 495 mm will displace about 9.6 litres of water, and the required mass of the balancing weight will be roughly 10.5 kg. G1PDF 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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