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Thermodynamic Performance Evaluation for Low Temperature Heat Source Cascade System Circulating Environment Friendly Refrigerants

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Figure

Figure 1. A schematic diagram for a Cascade system.
Figure 3. Ethylene glycol solution/low temperature cycle at low temperature evaporator for sea water source
Table 1. Some selected physical properties of the suggested refrigerants.
Figure 5a. Heat pump heating load comparison of different systems at HT condensation of (70)°C with (20)°C and (33)°C intermediate temperatures
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