Please help with the solutions.

7.7 An ideal OTEC system operates with a warm reservoir of 23 C and a cold reservoir of 5 C. The temperature of the evaporator is 22 C, and the temperature of the condenser is 11 C. Calculate the mass of water (vapor) flowing through the turbine needed to generate 1 MWh of electricity. Assume a 90% conversion from mechanical to electrical energy. Hint: Use reservoir temperatures for the Carnot efficiency and the evaporator and condenser temperatures to find the heat OH = mcAT. 7.8 A 20 MWe OTEC facility operates at a net thermal efficiency of 5.4%. The warm surface water is cooled by 12 C while passing through the system. Calculate the flow rate of warm water in cubic meters per second (m /s). Assume that the conversion from mechanical to electrical energy is 86% efficient. Hint: Use n = W /O and Q=mcAT. Also P= We