OPTIMISING THERMAL ENERGY RECOVERY

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• Pump Similarly to expanders, pumps do not transfer heat, and the heat transfer term is therefore zero, thus the entropy generation equation reduces to Φ£ m9 PÄOsPÄO , m9 gsg The total entropy generation is given by ΦOPO Φ£XY/YZf + ΦcPg + ΦYØ£ + Φ£ 6.5 Results and Discussion 6-12 6-13 The result of the simulation presented in Table 6-2 shows that the waste heat from the crisp manufacturing plant can be used to produce up to 199.40 kW of electricity at an efficiency of 14.39% while operating at the plant nominal design point. This value is more than the daily average electricity usage by the plant which currently stands at about 190.30 kW (see section 4.1). It also meets about 92% of the peak daily electricity usage, which was 216 kW at 18 hrs (see Figure 4-3). From the entropy generation analysis carried out, Preheater 2 is found to generate the most entropy in the system. It accounts for about 35.67% of the entropy, while the pump generates the least entropy in the system. In a real system, there is always a deviation in the nominal design point during the day-to-day operation of the plant. This may arise due to variations in the ambient weather conditions or other disturbances in the system such as variations in the waste heat source temperature and mass flow rate. 133

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