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Figure 36 Variation of COP with approach temperature Approach temperature at the gas cooler outlet (considering the CO2 side) is an important parameter and is defined as the temperature difference between CO2 leaving the gas cooler and water inlet temperature to the gas cooler. Variation of COP with the approach temperature is shown in figure 36. As the approach temperature increases (CO2 temperature increases at the gas cooler outlet) COP decreases because less energy is recovered from CO2, the same is shown in the figure. 4.3.2 Results based on the compressor data As stated earlier due to large variations in the thermophysical properties of CO2 near the critical point, the CO2 mass flow was also indirectly evaluated. The following plots are going to describe the variation in the calculated parameters when CO2 mass flow rate from compressor data was used. Case A Same operating conditions (set point temperature of 60 oC and varying evaporation temperature) were used, the only exception is the CO2 mass flow rate which in this case was evaluated from compressor data. 34PDF Image | heat recovery from R744 based refrigeration system
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