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F. Ju et al. , Q W H U Q D W L R Q D O - R X U Q D O R I 7 K H U P D O 6 Fig. 4. Temperature profiles of refrigerant and heat sink in condenser. (a) Integrated length of condenser Lc, and (b) relative transferring heat Qsk/Qh. 108.6 °C, which might cause problem against the stability of the lu- bricant and safe operation of the compressor. It means that the heat pump system with R22 cannot supply the hot water higher than 65 °C, while that with Mopt can supply hot water with even higher tempera- ture for its lower discharge temperature. Thus, the use of Mopt can lead to a promotion of compressor lifetime. For both Mopt and R22, the compressor power increased almost linearly as the rise of heat sink outlet temperature and Mopt consumed a slightly higher compressor power than R22 did at the tested heat sink outlet temperature range. Fig. 6(c) shows that the heating COPs of both Mopt and R22 shrink with the rise of heat sink outlet temperature, which is mostly due to their increments in condensing temperatures with evaporation condi- tions almost unchanged. The Mopt achieved an increase of 4.98–11.00% in heating COP with respect to R22 at the heat sink outlet temperature ranging from 45 °C to 65 °C. It also could be noted that the changes of heat sink outlet temperature had little effects on the heating capacities for both Mopt and R22, because the cooling capacities were almost unchanged measured by the transferring heat of the heat source. The 8PDF Image | heat pump water heater using R744
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