Chapter 7, Problem 7.155EP

A turbine receives steam at 10 MPa, 6000C and exhaust it at 0.2 MPa. (a) for the ideal Rankine engine, determine the work, steam rate, thermal efficiency, and means effective pressure. (b) for the actual engine,the brake engine efficiency is 84%; the driven generator efficiency is 93% and the rated output of the generator is 30 MW. Estimate the enthalpy ang quality (or temperature) of the exhaust..Compute the combined work, combined heat rate, and the total throttle flow for the rated power. Don't answer the given problem, just give me the schematic diagram andT-S diagram of the given problem

(a) What would be the necessary bore and stroke of a single acting four- cylinder, 350 rpm ammonia compressor working on simple saturation cycle between 35°C condenser and -15°C evaporator temperatures and developing 15 tons refrigeration. Given for the compressor: Ratio of stroke to bore = 1 Volumetric efficiency = 0.7 (b) If the index of compression is 1.15, find the error introduced in calculat- ing the work of compression by assuming the process to be isentropic. Also, find the heat rejected to the compressor-jacket cooling water.

Q 2: - A one cylinders Freon (134a) compressor has a Bore and Stroke 5.4 and 4.8 cm respectively. It is speed 1450 rpm volumetric efficiency c.v 100% working fluid reaches expansion valve at 42°C and the temperature %3D of its suction -8°C:- a- Find the mass flow rate of the refrigerant, heat capacity and COPact& COPtho? b- Find the mass flow rate of the refrigerant, heat capacity and COP & COPtho if the clearance factor will be 5%?

4. For Francis turbine with the following specifications: Paev= 225 MW, H=250 m, nov= 90 % , If the velocity of water at spiral case entering =24 m/s, and the volumetric efficiency is 0.98, thus the diameter of the spiral case entering is: a. 2.3 m. b. 2.8 m. c. 3.1 m. d. 3.6 m. e. None of them.

A turbine engine air intake is at pressure and temperature of air drawn 99 kPa and 29 °C respectively. The maximum pressure and temperature during the cycle is 990 kPa and 888 °C respectively. The adaibatic index as 1.4. After claculations, the pressure ratio of the cycle is compressor exit temperature is K, turbine exit temperature is K, net specific work output from the gas turbine engine is in k thermal efficiency_ is % and work ratio of the cycle is to I decimal place.

3. A single stage air compressor hadles 0.454 m^3/sec of atmospheric pressure, 27 deg. C air, and delivers it to a receiver at 652.75kPa. Compression is isothermal. Determine the work in kW

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Explain ideal Rankine cycle with P-V, T-S and h-S plot.

Answer the folloeing problems: A two-stage compressor takes air at 100kpa and 25C with volume flow of 0.123m3/s and discharges to 800kpa. What is the heat rejected(kw) by the intercooler? ANS. 14.82 A two-stage compressor with an ideal intercooler receives 0.5m3/s of Helium at 150kpa and 300K and discharges it at 7500kpa. Find the heat rejected(kw) at the intercooler. ANS. 27.015