A steam turbine cycle running on a Rankin cycle between the condenser pressure of 10 kPa and the boiler pressure of 165 bar, the steam enters the high pressure turbine at a temperature of 600 ° C. The average turbine expands to 800 kPa and then enters the boiler again to be reheated to 550 ° C. The steam leaves the boiler to a low pressure turbine, where it expands to the condenser pressure. If the expansion and compression in the turbine and the pump is isotropic, and the addition of heat is constant pressure, find the efficiency of the cycle. Note point # 1 at the exit area of the steam from the boiler

A steam turbine cycle running on a Rankin cycle between the condenser pressure of 10 kPa and the boiler pressure of 165 bar, the steam enters the high pressure turbine at a temperature of 600 ° C. The average turbine expands to 800 kPa and then enters the boiler again to be reheated to 550 ° C. The steam leaves the boiler to a low pressure turbine, where it expands to the condenser pressure. If the expansion and compression in the turbine and the pump is isotropic, and the addition of heat is constant pressure, find the efficiency of the cycle. Note point # 1 at the exit area of the steam from the boiler

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter45: Domestic Refrigerators And Freezers

Section: Chapter Questions

Problem 13RQ: Condensers in these refrigerators are all_______cooled.

See similar textbooks

Similar questions

A steam turbine cycle running on a Rankin cycle between a condenser pressure of 10 kPa and a boiler pressure of 20 MPa, the steam enters the high pressure turbine at a temperature of 600 ° C. The average turbine expands to 800 kPa and then enters the boiler again to be reheated to 500 ° C. The steam leaves the boiler to a low pressure turbine, where it expands to the condenser pressure. If the expansion and compression in the turbine and the pump is isotropic, and the addition of heat is constant pressure, find the efficiency of the cycle. Note point # 1 at the vapor exit region of the condenser
A steam Rankine cycle operates between the pressure limits of 1500 psia in the boiler and 3 psia in the condenser. The turbine Inlet temperature is 800°F. The turbine isentropic efficiency is 90 percent, the pump losses are negligible, and the cycle is sized to produce 2500 kW of power. How much error is caused in the thermal efficiency if the power required by the pump were completely neglected? Use steam tables. The error caused in the thermal efficiency if the power required by the pump was completely neglected is 32.65 %.
A steam Rankine cycle operates between the pressure limits of 1500 psia in the boiler and 4 psia in the condenser. The turbine inlet temperature is 800°F. The turbine isentropic efficiency is 90 percent, the pump losses are negligible, and the cycle is sized to produce 2500 kW of power. How much error is caused in the thermal efficiency if the power required by the pump were completely neglected? Use steam tables. The error caused in the thermal efficiency if the power required by the pump was completely neglected is %.
Steam Plant A steam power plant operates according to the Rankine cycle between a boiler pressure of 4 MPa and condenser pressure of 6.5 kPa. The steam has a temperature of 380 °C at inlet to the first turbine. It is just dry saturated on leaving this turbine for reheating to its original inlet temperature, before passing through a second turbine to the condenser. Draw a T-s diagram to illustrate the reheat cycle, neglect feed-pump terms and calculate the Rankine efficiency and specific steam consumption.
After the condenser, the pump increases the pressure of the feed water (T=40 degrees celsius, mass slow is 2 kg/s) and the water is preheated in the feed water tank (mixing preheater) with water steam from the intermediate intake (P=200 kPa, T=150 degrees celsius). The water leaving the feed water tank is at a pressure of 200 kPa and 110 degrees Celsius. Determine and calculate the pressure of the water coming into the feed water tank from the pump and the mass flow of water leaving the feed water tank.
Refrigerant 134a enters the compressor of a vapor-compression refrigeration cycle at 150 kPa as a saturated vapor and leaves at 850 kPa. The refrigerant leaves the condenser as a saturated liquid. The rate of cooling provided by the system is 7kW. a. Determine the mass flow rate of R-134a and the cop of the cycle. b. If the condenser pressure is changed to 950 kPa, find the cop of the cycle.
A power plant uses a gas turbine to produce electricity. Assume that the gas-turbine operates on the ideal Brayton cycle has a pressure ratio of 8. The outside air temperature is 27 °C and without preheating, the air is drawn into the compressor. The air compressed in the compressor and its pressure and temperature increase. Thereafter it is supplied into the combustion chamber where its temperature increases to 1023 °C at constant pressure. Thereafter, hot air is drawn into the turbine. By considering the air-standard assumptions, determine (a) the gas temperature at the exits of the compressor and the turbine (b) the back work ratio (c) the thermal efficiency
A turbo feed pump requires driving saturated water from the condenser into the boiler. The condenser pressure is 0.1 bar and the boiler pressure is 100 bar. The required feed water flow to the boiler is 0.2 m3 / sec and in the drive process the water increases its temperature by 2° C. The inlet pipe to the pump has a diameter of 60 cm and at the discharge it is 35 cm. On the drive side of the turbo pump, it has saturated steam at 25 bar at the inlet and at the discharge it has a pressure of 0.1 bar and a quality of 0.65. Determine: a) The mass flow of feed to the boiler b) The real power of the turbo pump assuming an efficiency of 90% in the water delivery c) The mass flow of steam through the turbo pump, for this calculation, neglect the effect of speeds. d) Steam velocity in the supply pipe to the turbo pump if it has a diameter of 30 cm. 3. 2 W. CV Turbine Pump
Steam enters the turbine of a cogeneration plant at 6 MPa and 550 degrees * C . One-third of the steam is extracted from the turbine at 1400 kPa pressure for process heating. The remaining steam continues to expand to 20 kPa. The extracted steam is then condensed and mixed with feedwater at constant pressure and the mixture is pumped to the boiler pressure of 6 MPaThe mass flow rate of steam through the boiler is 30 kg/s. Disregarding any pressure drops and heat losses in the piping, and assuming the turbine and the pump to be isentropic, determine (a) the net power produced(b) the utilization factor of the plant, (c) the exergy destruction associated with the process heating, and (d ) the entropy generation associated with the process in the boiler. Assuming a source temperature of 1000 K and a sink temperature of 298 K
2. A gas turbine that operates on Brayton cycle provides a furnace with hot pressurized gas through its exhaust at 220 kPa. The turbine produces only enough power as required by the compressor. The compressor has inlet conditions of 110 kPa and 300 K. The inlet condition of the turbine is 850°C. Determine the pressure ratio of the compressor. Draw the schematic diagram.
Steam is delivered by a steam generating unit at 1100 psia and 900 °F. After expansion in the turbine to 300 psia, the steam is withdrawn and reheated to the initial temperature. Expansion now occurs to the condenser pressure of 1 psia. For 1 lb/sec of steam in an ideal cycle, find the thermal efficiency.
A medium size power station is used to produce 30 MW net power for a refinery. The station uses steam as the operating fluid and operates according to the Carnot cycle between the pressure limits of 0.4 bar and 35 bar. Steam enters the boiler as a saturated liquid and leaves it as a dry saturated vapour.(v) Calculate the specific heat provided to the boiler, the specific work extracted from the power station and the mass flow rate of the steam circulating in the cycle