Considering Other Vapor Cycle AspectsConsider a cogeneration system operating as illustrat...

Considering Other Vapor Cycle Aspects

Consider a cogeneration system operating as illustrated in Fig. 8.14b. The steam generator provides 106 kg/h of steam at 8 MPa, 480°C, of which 4 × 105 kg/h is extracted between the first and second turbine stages at 1 MPa and diverted to a process heating load. Condensate returns from the process heating load at 0.95 MPa, 120°C and is mixed with liquid exiting the lower-pressure pump at 0.95 MPa. The entire flow is then pumped to the steam generator pressure. Saturated liquid at 8 kPa leaves the condenser. The turbine stages and the pumps operate with isentropic efficiencies of 86 and 80%, respectively. Determine

(a) the heating load, in kJ/h.

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(b) the power developed by the turbine, in kW.

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(c) the rate of heat transfer to the working fluid passing through the steam generator, in kJ/h.

Fig. 8.14 Vapor cycle district heating plants. (b) Extraction plant.