b) enters the turbine at a velocity of 70 m/s. The steam leaves the turbine at a point 2 m below the turbine inlet. The steam exits at atmospheric pressure and has a velocity of 100 m/s. The turbine delivers shaft work at a rate of 70 kW, the heat loss from the turbine is 4,000 kJ/hr. 1,000 kg/hr of superheated steam at 40 bar (abs.) and 350°C drives a turbine. The steam i. Draw a diagram of the system, outline assumptions and write the energy balance equation for the system. ii. Calculate the specific enthalpy of the steam leaving the turbine. ii. Calculate the temperature of the steam leaving the turbine.

b) enters the turbine at a velocity of 70 m/s. The steam leaves the turbine at a point 2 m below the turbine inlet. The steam exits at atmospheric pressure and has a velocity of 100 m/s. The turbine delivers shaft work at a rate of 70 kW, the heat loss from the turbine is 4,000 kJ/hr. 1,000 kg/hr of superheated steam at 40 bar (abs.) and 350°C drives a turbine. The steam i. Draw a diagram of the system, outline assumptions and write the energy balance equation for the system. ii. Calculate the specific enthalpy of the steam leaving the turbine. ii. Calculate the temperature of the steam leaving the turbine.

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

Chapter40: Typical Operating Conditions

Section: Chapter Questions

Problem 10RQ: The seasonal energy efficiency ratio (SEER) includes the energy used in the _____and _____cycles.

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8. A turbine passes 67.5 kg/h of steam at 200 km/h at 8 MPa and leaves at 0.5 MPa as wet steam with a speed of 90 km/h and a specific volume of 0.189 m3/kg. d. What must be the steam input conditions (T,H) to turn on a device that consumes 30 kW? and. What is the mass and volumetric flow rate of the water at the outlet? F. What is the input and output area?
f. A water-jacketed compressor receives 140 L/s air at 100 kPa and 21 deg C and discharges the air at 140 deg C. Cooling water entering at 16 deg C and leaving at 21 deg C is circulated at the rate of 0.18 L/s. Determine the power required for the driving motor for this compressor, assuming the friction losses with rotating parts account to 5% of the total power required. a. 10 kW b. 15 kW c. 20 kW d. 25 kW
Pls answer thank you! Steam enters the turbine at the rate of 2.5 kg/s with enthalpy of 3200 kj/kg and exhaust enthalpy of 1100 kj/kg . Steam is extracted from the turbine at the rate of 1 kg/s for heating purposes with enthalpy of 2750 kj/kg. What is the turbine work in KW.
3. Steam enters the turbine at the rate of 1.5 kg/s with enthalpy of 2300 kJ/kg and exhaust enthalpy of 1200 kJ/kg. Steam is extracted from the turbine at a rate of 0.87 kg/s for heating purposes with enthalpy of 2570 kJ/kg. What is the turbine work, in HP? draw a diagram and show full solution
iii) the exit area of the nozzle. Take Cp = 1.005 kJ/kg-K and R=287 J/kg-K Q.B3. A heat engine operates between two reservoirs at 400°C and 30°C. Half the power produced by the heat engine is used to drive a Carnot heat pump that removes heat from the cold surroundings at 2°C and transfers it to a house maintained at 27°C. The heat engine is absorbing heat at a rate of 5 kJ/s. i) Draw the complete schematic of the device ii) Determine the thermal efficiency of the heat engine iii) Determine the coefficient of performance of the heat pump iv) Determine the rate of heat loss from the house. v) Determine the minimum rate of heat extraction by the heat pump, and vi) the total rate of heat rejection.
Pls. Answer this thank you!Steam enters a turbine stage with an enthalpy of 3628 kj/kg at 70 m/s and leaves the same stage with an enthalpy of 2846 kj/kg and a velocity of 124 m/s. Calculate the power in KW if there are 5 kg/s steam admitted at the turbine throttle.
Task (4) Critically compare how the changes of the heat transfer efficiency will affect the lifetime of the turbine.
Air with a pressure of 0.1 MPa and a temperature of 25oC with a flow rate of 5.29 kg/minute enters a three-stage reciprocating piston compressor with intercooler. The air is compressed polytropically (n = 1.3) to reach the pressure of 4 MPa. Calculate: a) The amount of heat transferred to each intercooler? b) How much air is needed for cooling in the intercooler if the allowable maximum temperature changes between the inlet and outlet of the intercooler is 8oC?
5.0 A 140 x 140-mm, twin-cylinder, single acting refrigerant- 12 compressor running at 600 rpm carries a refrigeration capacity of 40 kW while operating at 350 kPa suction and 1300 kPa discharge pressures. , Assuming the same load to be carried with the same volumetric efficiency and if the discharge pressure shall be raised to 1400 kPa, a) what is the percent increase in mass of R-12 (b)What will be the new volumetric displacement of the compressor the compressor be run? in m/sec ?;(c)At what speed should
a refrigeration system operates on the reversed carnot cycle with a refrigerant higher temperature of 50 °C, the COP is 5 and the capacity is 30 tons. Determine the change of entropy in Kj/min.K.
In the system shown in the figure, saturated liquid water at 12 MPa pressure enters the boiler at a flow rate of 45 kg / h. Heat is transferred from a heat source at 650 ° C to the water in the boiler at constant pressure, and superheated steam at 450 ° C temperature is obtained. The steam in the form of superheated steam then expands adiabatically in the turbine and comes out as saturated steam at 50 kPa pressure. a) Show the operations on the T (° C) -s (kJ / kgK) diagram. b) Find the isentropic efficiency and power of the steam turbine. c) Find the total entropy generation by calculating the entropy productions in the boiler and the turbine.
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