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temperature, fuel consumption, operating hours and average monthly ambient temperature of the site location. The amount of waste heat available from the CHP system varies between 3.82 MW and 5.09 MW. D. Recovering Waste Heat using ORC Systems The viability of recovering waste heat using ORC systems is dependent on the amount of waste heat and the temperature of the heat source. The amount of waste heat available and power generation from the CHP system was calculated based on an exit exhaust gas temperature of 125°C and ORC system efficiency of 12.75%. The amount of waste heat available from the CHP system varies between 1.70MW and 2.70 MW (see figure 10(a)). Transforming this waste heat using ORC systems (Clean CycleTM 125) could generate between 217 kW and 344 kW of gross electricity, see figure 10(b). 19.5 19 18.5 18 17.5 17 16.5 -10 -5 0 5 10 15 20 25 30 Ambient temperature, oC Fig. 5(a). The effect of ambient air temperature on the exhaust gas flow rate. 400 380 360 340 320 300 280 Ambient Temperature = -5oC 260 Ambient Temperature = 0oC Ambient Temperature = 5oC 240 Ambient Temperature = 10oC Ambient Temperature = 15oC 220 Ambient Temperature = 20oC Ambient Temperature = 25oC 200 50 55 60 65 70 75 80 85 90 95 100 Steam production capacity, % Fig. 6(a). Influence of steam production on the exhaust gas temperature at various ambient temperatures. 7500 7000 6500 6000 5500 5000 4500 4000 3500 Ambient Temperature = -5oC Ambient Temperature = 0oC Ambient Temperature = 5oC Ambient Temperature = 10oC Ambient Temperature = 15oC Ambient Temperature = 20oC Ambient Temperature = 25oC 50 55 60 65 70 75 80 85 90 95 100 Steam production capacity, % Fig. 6(b). Influence of steam production on the energy available from the exhaust at various ambient temperatures. 600 550 500 450 400 350 300 250 200 150 525 520 515 510 505 500 495 490 485 Exhaustgastemperature Exhaust gas flowrate 18.4 18.35 18.3 18.25 18.2 18.15 100 -10 -5 0 5 10 15 20 25 30 Ambient temperature, oC Fig. 5(b). The effect of ambient air temperature on the exhaust gas temperature from gas turbine and waste heat boiler. Fig. 7(a). Exhaust gas conditions from the gas turbine at various gas turbine output. Exhaust gas temperature from gas turbine Exhaust gas temperature from waste heat boiler 2 2.5 3 3.5 4 4.5 5 Gas turbine power output, MW 5000 4900 4800 4700 4600 4500 4400 4300 4200 4100 4000 3900 3800 3700 3600 Exhaustgastemperature 3500 240 235 230 225 220 215 210 205 200 195 Exhaust gas temperature, oC Exhaust gas flowrate, kg/s Wasteheatavailability,kW Exhaustgas temperature,oC Wasteheatavailability,kW Temperatureofwasteheat,oC Exhaust gas temperature, oC Exhaust gas flowrate, kg/s 2 2.5 3 3.5 4 4.5 5 Gas turbine power output, MW Fig. 7(b). Exhaust gas conditions from the waste heat boiler and energy available at various gas turbine output. Waste heat availabilityPDF Image | Assessment and modelling of the waste heat availability from gas turbine based CHP systems for ORC systems
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