Chapter 9, Problem 9.38P

In a steam turbine plant steam expands in the high pressure turbine from 5000kPa, 500°C to 500kPa with an isentropic efficiency of 0.9. It is then reheated isobarically to 500°C before entering the low pressure turbine. In the low pressure turbine the steam expands to dry saturated, 5kPa. The condensate leaves the condenser with 4° of undercooling. Determine: (a). the condition of the high presfsure turbine exhaust (b). the isentropic efficiency of the low pressure turbine (c). the specific steam consumption for a turbine output power of 7.5MW (d). the Rankine efficiency including the feed pump

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In a reheat cycle steam at 15 MPa, 540 degrees Celsius enters the engine and expands to 1.95 MPa. At this point the steam is withdrawn and passes through a reheater. It reenters the engine at 540 degrees Celsius. Expansions now occur to the condenser pressure of 0.0035 MPa. Find the efficiency.

Н.W A smaller power plant produces steam at 3 MPa, 600•C, in the boiler. It keeps the condenser at 45 C by the transfer of 10MW out as heat transfer. The first turbine section expands to 500 kPa, and then flow is reheated followed by the expansion in the low-pressure turbine. Find the reheat temperature so that the turbine output is saturated vapor. For this reheat, find the total turbine power output and the boiler heat transfer. [Answer. (Reheat temperature= 529°C , total turbine power output= 6487 kW, the boiler heat transfer= 16 475 kW)]

The evaporator (a heat exchanger) in an A/C unit has R-410A entering at -20 °C and a quality of 30% and leaves at the same temperature and a quality of 100%. The COP of the air conditioner is known to be 1.3 and the mass flow rate is given as 0.013 kg/s. Find the power input to the cycle. (Note that, here, the evaporator is the part of the A/C unit that accepts [i.e., withdraws] heat from the room maintained at a cold temperature)

Open feed water heater in the power plant operating according to the Rankine cycle with ideal intermediate steam is used. Turbine inlet state is 10MPa 650C. Condenser pressure is 10 kPa. Intermediate steam taking takes place at a pressure of 2 MPa. The intermediate steam mass flow rate depends on the total mass flow. Find the ratio. Find the thermal efficiency. TIP: Treat the mass flow entering the turbine by saying 1, and r for the intermediate steam. Result: r = 0.239, yield 45.2%

When a steam boiler generates saturated steam at 2.5 mpa and the condenser pressure is 20 kpa, what is the Rankine cycle efficiency?Show complete step-by-step process and solution.

Example 2: Refrigerant R-134a enter the compressor of a has a refrigerantor a superheared vapor at 0.14MPa and -10°C at arate of 0.05kg/sec and leave at 0.8Mp and 50°C.The refrigerant cooled in the condenser to 26°C and 0.72Mpa is throttled to 0.15MPa.Disregradingany heat transfere and pressure drop in the connecting line between the components. Determine: a) The rate of heat removed from the refrigerated space b) The power input to the compressor. c) Isentropic eff of the compressor d) COP of the refrigerantor.

A power plant operating in a Reheat Rankine Cycle produces steam at 3 MPa, 600oC in the boiler. It keeps the condenser at 45oC by transfer of 10 MW out as heat transfer. The first turbine section (high-pressure) expands to 500 kPa and then flow is reheated followed by the expansion in the low-pressure turbine. Provide a detailed solution. Avoid shortcuts. Find the boiler heat transfer including the reheat process (kW)