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R-134a is throttled in a line flowing at 25°C, 750 kPa with negligible kinetic energy to a pressure of 165 kPa. Find the exit temperature and the ratio of exit pipe diameter to that of the inlet pipe (Dex/D;n) so the velocity stays constant.

A steam is expanded through a nozzle and the enthalphy drop per kg of steam from the initial pressure to the final pressure is 70 kJ. Neglecting the friction, find the velocity of discharge.

Air enters a diffuser at 50 kPa, 85°C with a velocity of 250 m/s. The exit pressure is atmospheric at 101 kPa. The exit temperature is 110°C. The diameter at the inlet is 8 cm.a. Find the exit velocity.b. Find the diameter at the exit.Note: Assume constant specific heats.

A 650 bhp Diesel Engine with 6 cylinders has a brake thermal efficiency of 36 % and a jacketwater loss of 27%. It uses a closed cooling system with a cooling tower 10 meters high. Thetemperature rise after passing the water jacket is 12 °C and the cooling tower range is 5 °C. Make asketch showing the vital parts of the cooling tower system and calculate:a) capacity of the jacket water pump in GPMb) exhaust loss if the friction, radiation and other losses total 8%.c) cooling water flow rate in the cooling tower in liter/hrd) standard size electric motor to drive the raw water pump if the total dynamic head is 35 meters and the pump efficiency is 84%

The power of a steam turbine in a thermal power plant is 60 MW. Water vapor enters the turbine at 3MPa pressure, 4000C temperature and 50 m / s speed, 10 kPa pressure, 0.9 dry degree and 200 m / s speed leaves the turbine. Considering the turbine as adiabatic; 1-Find the mass flow of steam 2-Find the turbine outlet cross-sectional area, its ratio (A2 / A1) to the inlet cross-sectional area.

A nozzle is a device for increasing the velocity of a steadily flowing stream of fluid, At the inlet to a certain nozzle the enthalpy of the fluid is 3025 kJ/kg and the velocity is 60m's. At the exit from the nozzle the enthalpy is 2790 kJ/kg. The nozzle is horizontal and there is negligible heat loss from it. (a) Find the velocity at the nozzle exit. (b) If the inlet area is 0.1 m’and the specific volume at the inlet is 0.19 m²/kg, find the rate of flow of fluid (C) If the specific volume at the nozzle exit is 0.5 m kg, find the exit area of the nozzle. Dr. Hameed J. Khalaf Subject Lecture

A water pump is used in a heating system to deliver hot water at 91 GPM and 121 ft w.c. The pump efficiency is 90%. What is the water horsepower?

A steam turbine developed 2372.20 hp when its inlet condition is 1300 BTU/lb enthalpy and 400 ft/s velocity and steam flow of 200 lb/min. The exit enthalpy is 800 BTU/lb. Find the exit velocity.

A boiler feed pump has a suction enthalpy of 2500 KJ/kg and exit of 2505KJ/kg. Find the velocity of water in the flowing in the pump.  Answer: 100m/s

Find the minimum flow of cooling water per kWh if its temperature is only allowed to increase by10°C.

A condenser (heat exchanger) brings 1 kg/s water flow at 10 kPa quality 95% to saturated liquid at 10 kPa. The cooling is done by lake water at 20 degree Celsius that returns to the lake at 30 degree Celsius. For an insulated condenser, find the flow rate of cooling water.

If 10 kg/min of air are compressed isothermally from P1=96kPa and V1=7.65m^3/min toP3=620kPa, find the work change of entropy and the heat for: a) nonflow process and b) steadyflow process with v1=15m/s and v2=60m/s.