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Figure 34 T_h diagram (with all three heat exchangers in operation) Temperature enthalpy diagram (figure 34) shows the cooling and heating profile of the two fluids. As it is clear from the figure most part (almost 60%) of the heat transfer (for tap water heating) takes place in 1st heat exchanger due to the geometrical constraints of the system. It is evident from this figure that better matching (for cooling and heating curves) can be obtained by splitting gas cooler in three parts. Lorenz efficiency with gas cooler pressure 50% 40% 30% 20% 10% 0% 7400 Water 16-60 oC Lorenz efficiency 30-35 oC (Space heating) 7600 7800 8000 8200 8400 Gas cooler side pressure (kPa) Figure 35 Variation of Lorenz efficiency with gas cooler pressure Variation of achieved Lorenz efficiency with the gas cooler side pressure is shown in figure 35. As the high side pressure increases system performance improves (Lorenz efficiency increases). 33 Lorenz efficiencyPDF Image | heat recovery from R744 based refrigeration system
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