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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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Nomenclature R Thermal resistance R Universal gas constant s Specific entropy SPF Seasonal Performance Factor t Period of time, time step T Temperature U Overall heat transfer coefficient (per unit area) U* Overall heat transfer coefficient (per unit length) v Specific volume v V elocity V V olume V& Swept volume (compressor) VRC Volumetric refrigerating capacity w Specific compressor work x Direction (x axis) X Dimensionless variable y Direction (y axis) z Direction (z axis) Z Compressability factor Greek Letters α Thermal diffusivity β Ratio, variable ∆ Difference ∂ Partial derivative δ Differential ξ Friction factor, ratio η Efficiency θ Temperature difference γ Dimensionless factor κ Exponent μ Dynamic viscosity ν Kinematic viscosity π Pressure ratio, 3.14 ρ Density ΣSum τ Period of time K/W Nm/(g·mole·K) J/(kgK) - s °C, K W/(m2K) W/(mK) m3/kg m/s m3 m3/s J/m3 J/kg - - - - - m2/s - - - - - - K - - Pa⋅s m2/s - kg/m3 - s 234

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Residential CO2 Heat Pump System for Combined

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