To produce more power the upper management decided to modify the power plant by placing the stage 2 as a saturated liquid stage. The condenser site was planned to leave as it is with the same parameters. The flow rates stays the same. See the figure below for the data. Again, this an ideal case: S2-S1; S3=S4. Boiler P1=36.29bar Lin Turbine Condenser P2=2.26 bar -2 Saturated vapor T6=? 6 Cour ||T5=15C 5 Cooling water Pump 3 saturated liquid

A single compressor using ammonia as refrigerant has three evaporators of capacity 30 TR, 20 TR and 10 TR. The temperature in the three evaporators is to be maintained at -10°C, 5°C and 10°C, respectively. The system is provided with individual expansion valve and back pressure valves. The condenser temperature is 40°C. Assume isentropic compression: a. Draw the P-h diagram. b. What is the mass of refrigerant flowing through each evaporator? c. What is the power required to drive the compressor? d. What is the COP of the system?

Problem 2: Win High-pressure liquid water (Pump Boiler Condenser à out Low-pressure liquid water FIGURE 7-1 Example of a power cycle. High-pressure steam 3 Turbine Wout Low-pressure superheated vapor or high-quality two-phase mixture A simple steam power cycle consists of a boiler, turbine, condenser, and pump as shown in the sketch above. All the heat removal in the cycle is done by the condenser which transfers the heat to pipes carrying cooling water. The cooling water has a mass flow rate of 7 kg/sec, and a specific heat of 4,180 J/kg-°C. The cooling water is supplied at a temperature of 10 °C and exits at 20 °C. Heat is supplied to the cycle through a steam boiler at a rate, Ċin = 420 kW. Find the following: a. The rate at which heat is rejected from the cycle to the cooling water, Qout- b. The net power produced in kilowatts, Wnet- c. The cycle efficiency, cycle.

The condensing pressure for a Rankine engine is 0.001325  MPavac. Calculate the following for steam flow rate  =  1 + (200/13) kg/sec of steam when the steam at the beginning of expansion is at 119.6 deg SH and 4.0 Mpaa.  Draw the TS and equipment diagrams for the ideal and actual case and find for the following for the ideal case: PV and TS diagrams of the cycle showing ideal and actual process lines Heat rejected at condenser (KJ/sec). Ans.____________________________ Mass of cooling water in kg/sec if cp H2O = 4.18 KJ/kg-K, and inlet temp of water to condenser = 20 deg C, outlet temp is 35 deg C. Ans.____________________________ Rankine engine efficiency (%). Ans.____________________________ Cycle thermal efficiency ( %). Ans.____________________________

3. Operate at lower condenser of a Rankine Engine. P1=50 bar (saturated) P2=½bar=0.5 bar. Calculate the efficiency of cycle and engine using Mollier chart. Can you show step by steps solution using the formula given?

A reheat cycle with two stages of reheating is executed with steam expanding initially from 20 MPa and 540C. The two reheater pressures are 3.8 MPa and 0.97 MPa, and the steam leaves each reheater at 540C. Condensation occurs at 60C. Compute the efficiency of the cycle. (Attach your T-S and schematic diagram of this problem)

A direct contact condenser of the spry type receives 60 kg/s of 925 quality steam at 0.06bar. A dry cooling tower system cools the feedwater to 15 oC. calculate the condensatepump volume flow rate , and the pump power input if the pressure losses in the dry coolingtower system are 2 bar and the pump efficiency is 0.7.

3- A reaction turbine is supplied with steam at (60 bar, 600 C°). The condenser pressure is (0.07 bar). If the reheat factor can be assumed to be (1.04) and the stage efficiency is constant throughout at (80%). Calculate the steam flow required in (ton/hr) for a diagram power of (25 MW). (Ans. 75.6 ton/hr) 4- The steam consumption at full load for a (3 MW) turbine is (16.6 ton/hr). At half load the steam consumption is (9.1 ton/hr). Applying Willan's line, estimate the steam consumption at no load, and the consumption at a load of (2.5 MW). (Ans. 1.6 ton/hr; 14.1 ton/hr)

Steam is supplied to a two-stage turbine at 48 bar and 400 °C. It expands in the first turbine until it is just dry saturated, then it is re-heated to 400 °C and expanded through the second-stage turbine. The condenser pressure is 0.04 bar. High-P turbine Low-P turbine Reheater Boiler -o P4 = P3 = Preheat Condenser Use file 4 to answer quesion 4 to find the thermal efficiencyof the systemin percentage to 2.d.p. ? Ifo

Problem Using Separate Reheater An Actual Reheat Cycle with one-stage reheating is executed with steam expanding initially from the throttle at 8 MPa and 485°C. The steam enters a Reheater at 1.425 MPa, 305°C. The steam leaves the reheater at 485°C_with a pressure drop of 425 kPa. The steam leaves the Turbine at 35°C after 2nd expansion with 95%quality. The condensate is subcooled by 20°. Turbine mechanical efficiency, 78%; Generator output 40MW at 92% efficiency. Determine For Actual cycle (a) Thermal efficiency in % (b) Steam rate in kg/kwh (c) Heat rate in kJ/kwh For Actual Engine (d) Indicated engine efficiency in % (e) Brake engine efficiency in % (f) Combined engine efficiency in % (g) mass flow of steam in kg/h