Figure 2 shows the schematic diagram of the modified vapor-compression
refrigeration cycle (MVRC) system. In the MVRC system, a phase separator is added
on the basis of TVRC system, and the previous condenser in TVRC is split into two
condensers and a subcooler. As shown in Fig. 2, the MVRC system consists of two
loops and two evaporators which are connected in parallel. In addition, two SLHXs
are also configured in the refrigerator evaporator (RE) and freezer evaporator (FE)
loops, respectively. The refrigeration process of MVRC is described as follows: the
vapor mixture of R290/R600a enters the compressor (state 1) and is compressed to the
superheating vapor (state 2) that is fed to the condenser-I; the vapor mixture is partially
condensed in the condenser-I, and then flows to the phase separator (state 3); after the
phase separator, the condensed partial liquid with more R600a composition (state 3')
passes the subcooler, SLHX-I and capillary tube-I, and then enters the RE (process 3'
-4'-5'-6'); on the other hand, the vapor from the separator with more R290 composition
(state 3'') flows to the condenser-II and then is totally condensed (process 3''-4); the
condensed liquid (state 4) is transferred through the SLHX-II and capillary tube-II to
the FE (state 6) where it is vaporized completely and further passes through the
SLHX-II (process 4-5-6-7); the vapor (state 8) is mixed with the vapor from the RE (state 7'), and then the mixing vapor (point 9) returns to the inlet of the compressor
(point 1) through the SLHX-I. Fig. 3 demonstrates the pressure-enthalpy diagram of
MVRC.
Figure 2 shows the schematic diagram of the modified vapor-compression
refrigeration cycle (MVRC) system. In the MVRC system, a phase separator is added
on the basis of TVRC system, and the previous condenser in TVRC is split into two
condensers and a subcooler. As shown in Fig. 2, the MVRC system consists of two
loops and two evaporators which are connected in parallel. In addition, two SLHXs
are also configured in the refrigerator evaporator (RE) and freezer evaporator (FE)
loops, respectively. The refrigeration process of MVRC is described as follows: the
vapor mixture of R290/R600a enters the compressor (state 1) and is compressed to the
superheating vapor (state 2) that is fed to the condenser-I; the vapor mixture is partially
condensed in the condenser-I, and then flows to the phase separator (state 3); after the
phase separator, the condensed partial liquid with more R600a composition (state 3')
passes the subcooler, SLHX-I and capillary tube-I, and then enters the RE (process 3'
-4'-5'-6'); on the other hand, the vapor from the separator with more R290 composition
(state 3'') flows to the condenser-II and then is totally condensed (process 3''-4); the
condensed liquid (state 4) is transferred through the SLHX-II and capillary tube-II to
the FE (state 6) where it is vaporized completely and further passes through the
SLHX-II (process 4-5-6-7); the vapor (state 8) is mixed with the vapor from the RE (state 7'), and then the mixing vapor (point 9) returns to the inlet of the compressor
(point 1) through the SLHX-I. Fig. 3 demonstrates the pressure-enthalpy diagram of
MVRC.
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