Do Problem 9.31 with R-134a as the working fluid in the Rankine cycle.

Data from Problem 9.31

Consider the ammonia Rankine-cycle power plant shown in Fig. P9.31. The plant was designed to operate in a location where the ocean water temperature is 25◦C near the surface and 5◦C at some greater depth. The mass flow rate of the working fluid is 1000 kg/s. 

a. Determine the turbine power output and the pump power input for the cycle.
b. Determine the mass flow rate of ocean water through each heat exchanger.
c. What is the thermal efficiency of this power plant?

Transcribed Image Text:

Insulated heat exchanger Surface 23°C 25°C H,0 P4 = P, Saturated vapor NH, T, = 20°C Pump NH3 CYCLE Turbine WT -Wp Saturated liquid NH, O T = 10°C O P2 = P3 5°C deep H20 7°C Insulated heat exchanger FIGURE P9.31