40_Lessons_on_Refrigeration_and_Air_Conditioning_www.hvac-eng.ir_84

40_Lessons_on_Refrigeration_and_Air_Conditioning_www.hvac-eng.ir_84

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) h h ( Q 3 2 c . = m r . (10.25) where h 3 and h 2 are the specific enthalpies (kJ/kg) at the e respectively. r pressure P c is the saturation pressure corresponding to evaporator mperature T , i.e., xit and inlet to the condenser, The condense te c ) T ( P P c sat c = (10.26) Expansion device: For the isenthalpic expansio cross the expansion device could be considerable, however, if we take the control n process, the kinetic energy change a volume, well downstream of the expansion device, then the kinetic energy gets dissipated due to viscous effects, and 4 3 h h = (10.27) The exit condition of the expansion device lies e definition of quality (or dryness fraction), we can write: h in the two-phase region, hence applying th 4 f e , g 4 e , f 4 4 x h h x h ) x 1 ( h + = + = fg (10.28) where x 4 is the quality of refrigerant at point 4, h f,e , h g,e , h fg nthalpy, saturated vapour enthalpy and latent heat of vaporization at evaporator are the saturated liquid e pressure, respectively.
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