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Table 3.1. Input data Amount of superheat [oC] Amount of subcooling [oC] Inlet temperature of brine [oC] Outlet temperature of water [oC] Mass flow [kg/s] Specific heat [kJ/kg-°C] Brine/water 3.1.2. Evaporator A typical temperature profile observed in an evaporator can be seen in Figure 3.3. Figure 3.3. Temperature profiles of brine and refrigerant in the evaporator On the brine side, the water-ethanol mixture enters at Tb,in and leaves at Tb,out. Tb’ occurs when the evaporation line crosses the saturated vapour line (x=1), and thus separates the evaporation phase from the superheating phase. On the refrigerant side, in the evaporation phase the temperature is constant at T1 = T1’=Tevap and is increased to T2 (compressor inlet temperature) in the superheating phase. In order to define the performance of the evaporator, two major parameters need to be calculated: the LMTD and the UA value. In order to obtain results closer to the real case, both these indicators have been identified for the evaporation and for the superheating phases separately. Equations (3.11) and (3.12) have been used, all the temperature differences mentioned are stated graphically in Figure 3.3. for the evaporation phase and LMTDevap = Δevap,in − Δevap,out Δevap,in ln( ⁄ ) Δevap,out (3.11) -24-PDF Image | Next generation of refrigerants for residential heat pump systems
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