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6 – Modelling Owing to the curvature (dh/D) of tube-in-tube heat exchangers and the consequent centrifugal forced that are initiated, the pressure drop will be greater than that of straight tubes. 6.1.3.5 Programming Language and Model Structure The computer model was programmed in Microsoft Excel/Visual Basic. Based on former experiences with computer simulation of counter-flow CO2 gas coolers (Adriansyah, 2001), each gas cooler unit was divided into 20 sub-sections. Within each sub-section the thermophysical properties of the fluids were calculated on the basis of the arithmetic mean temperature. Table 6.1 shows the calculated length of the gas cooler sub-sections and the maximum CO2 temperature gradient within each section, when the gas cooler geometry and the operating conditions were the same as for the prototype CO2 heat pump unit presented in Sections 4.1 and 5.1, Testing of a Residential Brine-to-Water CO2 Heat Pump Unit. Table 6.1 The maximum CO2 temperature gradient for the gas cooler sub-sections in the computer model when using data for the prototype CO2 heat pump unit (ref. Sections 4.1 and 5.1). Ranges Total length [m] Sub-section (cell) length [m] Preheating Heating Reheating Comb. mode: DHW mode: SH mode: Max. temp. range [oC] Max. temp.grad. [K/cell] Max. temp. range [oC] Max. temp.grad. [K/cell] Max. temp. range [oC] Max. temp.grad. [K/cell] 5–30 28–60 40–100 Figure 6.5 illustrates the structure of the modelled tripartite gas cooler including the internal connection between the sub-sections. The most important input and output variables are also displayed. The subscripts SH and DHW refer to the space heating and hot water circuits, respectively. 180 DHW Space DHW 14 15 3 0.70 0.75 0.15 1.3 1.6 3.0 5–70 * 3.8 * 3.5 50–120 * 28–100 * * 3.0 *PDF 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
Heat Pumps CO2 ORC Heat Pump System Platform More Info
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