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6th International Conference on Pumps and Fans with Compressors and Wind Turbines IOP Publishing IOP Conf. Series: Materials Science and Engineering 52 (2013) 042018 doi:10.1088/1757-899X/52/4/042018 siloxane before it flows into the gas heater(process 4-6). The low temperature vapor exiting from the regenerator flows into condensate heater where it is used to heat the working fluid of low-temperature stage and at the same, the vapor itself is liquefied and condensed into saturated liquid(process 6-5). The saturated liquid available at the condensate heater outlet is pumped to be high pressure liquid (process 5-2) by working fluid pump, and then flows into the regenerator where it is preheated before flowing into the gas heater(process 2-1). The preheated siloxane flows into gas heater to finish the high-temperature stage ORC. Red heavy line——high-temperature stage; Blue heavy line——low-temperature stage Figure.1 Scheme of two-stage transcritical combined ORC for DE Siloxane2 R143a 0.75 1.00 1.25 1.50 1.75 2.00 s [kJ/kg-K] b) low temperature stage(LORC) 400 350 300 250 75 200 50 150 25 100 0 50 -25 0 -50 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 s [kJ/kg-K] a) high temperature stage(HORC) Tgfin 1 2 Qcc 5 Qcs 3g 4 4ideal 6 Siloxane2 Vvapour Tgout 3 Qa1 Figure 2. T-s diagram of two-stage transcritical combined ORC To the LORC. (the blue heavy line in Fig. 1), the transcritical ORC system can be identified as e-f-fgm- g-j-a-k-b-d-e (in Fig.2b) and is as the same as HORC. During the heating process, working fluid, R143a, is heated by the coolant waste heat from DE(process e-f), by the siloxane steam of high- temperature stage(process f-fgm-g), by the CAC waste heat(process g-j), by the residual exhaust waste heat(process j-a) which has been used in high-temperature stage before, and finally by the residual low-temperature EGR waste heat(process a-k) which also has been used in high-temperature stage before. The low pressure R143a vapor exits from the expander and flows into the condenser where it is liquefied and condensed into saturated liquid (process b-d) by supplied cooling water. 3. Mathematical modeling 3 150 125 100 Twout e R143a j fgm g Twin fb d Tkout k a Tkin T [ °C ] T [ °C ]PDF Image | Parametric and exergetic analysis of a two-stage transcritical combined organic Rankine cycle used for multiple grades waste heat recovery of diesel engine
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