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A liquefied natural gas (LNG) regasification facilityutilizes a vertical heat exchanger or vaporizer that consists of a shell with a single-pass tube bundle used toconvert the fuel to its vapor form for subsequent delivery through a land-based pipeline. Pressurized LNG isoff-loaded from an oceangoing tanker to the bottom ofthe vaporizer at
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- Liquid benzene at 38 C with a vapor pressure of 26.4 kN/m2 and a density of 860 kg/m3 isto be pumped at a rate of 0.0025 m3/s from a storage tank to a discharge location 3 m abovethe liquid level in the tank. The pump with a mechanical efficiency of 60 percent is 1 mabove the liquid level. The storage tank is at atmospheric pressure. The pressure at the endof the discharge line is 445 kPa absolute. The inside diameter of the pipe used to transfer thebenzene is 0.0409 m. The frictional pressure drops in the suction line and the discharge linehas been evaluated as 3.45 and 37.9 kN/m2, respectively. Determine the head developed bythe pump and the total power requirement. If the pump manufacturer specifies a required netpositive head of 3.0 m, will such a pump be applicable for this service?arrow_forwardAir is drawn into the compressor at pressure of 100 kPa and temperature of 22ºC. The volumetricflow rate at the compressor inlet is 0.4 m3/s. The compressor exit pressure is 900 kPa and thecompressor efficiency is 70%. The air leaving the compressor passes through a heat exchangerwhere it is cooled by transferring heat to the atmosphere at 22ºC. The outlet temperature of airafter the heat exchanger is 32ºC. The air passes through a valve and enters a 1 m3 rigid tank. Theinitial pressure and temperature of the air in the tank are 100 kPa and temperature of 22ºC,respectively. The final pressure and temperature of the air in the tank are 900 kPa and temperatureof 90ºC. During the filling process, the tank transfers heat to the surroundings (at 22ºC).Don’t assume constant specific heat.Determinea) The mass flow rate of air entering the compressor, ?̇ (kg/s).b) The rate of power consumed by the compressor, (kW).c) The rate of heat transfer from the heat exchanger to the atmosphere, (kW).d)…arrow_forwardA reaction turbine used 9,000 kg of steam per hour. At one point in the turbine, the blades are 20 mm high and the discharge angle of both fixed and moving blade is 20°. The steam leaves the fixed blade at a pressure of 0.32 N/mm² with a dryness fraction of 0.95, and a velocity of 120 m/s. Assume the ratio of axial velocity of flow to blade velocity as 0.70 at entry to and 0.76 at exit from the moving blades. Assuming a tip leakage of 6% of the total steam, determine the following: 1. Speed of the turbine in Revolutions per minute. a. 1252 b. 894 c.2453 d.3434 e.1752 2. Power developed in kilowatts. a.66.76 b.47.69 c.24.33 d.34.06 e.93.47arrow_forward
- Saturated propane vapor at 2:00 x 102 psia is fed to a well-insulated heat exchanger at a rate of 3:00 x 103 SCFH (standard cubic feet per hour). The propane leaves the exchanger as a saturated liquid (i.e., a liquid at its boiling point) at the same pressure. Cooling water enters the exchanger at70°F, flowing cocurrently (in the same direction) with the propane. The temperature difference between the outlet streams (liquid propane and water) is 15°F.(a) What is the outlet temperature of the water stream? (Use the Antoine equation.) Is the outlet water temperature less than or greater than the outlet propane temperature? Briefly explain.(b) Estimate the rate (Btu/h) at which heat must be transferred from the propane to the water in the heat exchanger and the required flow rate (lbm/h) of the water. (You will need to write two separate energy balances.) Assume the heat capacity of liquid water is constant at 1.00 Btu/(lb m°F) and neglect heat losses to the outside and the effects of…arrow_forwardCompressed air with a flowrate of 7 kg/min flows through a two-stage turbine and heat exchanger system as follows: At the entrance to the system (point 1), the pressure of the air is 9 bar and the temperature of the air is 403 K. From 1-2 the air passes through a heat exchanger which increases its temperature to 952 K. From 2-3 the air passes through a turbine, with a pressure ratio of 3 (i.e. bevelled p subscript 2 over p subscript 3 equals 3). This first turbine has an isentropic efficiency of 60%. From 3-4 the air passes through a second heat exchanger, which increases its temperature back up to 952 K. From 4-5 the air passes through a second turbine with a pressure ratio of 3 and an isentropic efficiency of 80%. The properties of air are: cp = 1.005 kJ/kgK, cv = 0.718 kJ/kgK, R = 0.287 kJ/kgK, and gamma= 1.4. Select the correct value for each of the following values: The heat transfer to the air in the first heat exchanger (i.e. Q with dot on top subscript 12) in kW: The…arrow_forwardAssuming the clearance is negligible for a single stage compressor with the followingdata.Atmospheric pressure: 90 kPaAtmospheric temperature: 17 ˚CDelivery pressure: 7 barFree air delivery flow rate: 0.2 m3/minTake “n” as 1.3, cp = 1.005 kJ/kg K, cv = 0.718 kJ/kg K Calculatate the following 1 )Evaluate the mass flow rate of air inside the compressor operating isentropically in kg/min to 3 decimal places. 2 ) What is the power input to the compressor in kW to 3 decimal places if the compression reversible isothermal? 3 ) What is the power input to the compressor in kW to 2 decimal places if the compression is polytropic compression process with n=1.25?arrow_forward
- In general, heat exchangers with higher flow rates have greater capacities?arrow_forwardA trial run on a steam turbine power plant gave the following resultsEntrance to boiler Exit of turbineMass flow rate =3600 kg/h Velocity of steam=25 m/sEnthalpy of water=850 kJ/kg Elevation above datum=0Elevation above datum=4.3 m Enthalpy of steam=2625 kJ/kgVelocity of water=5 m/sDetermine the power developed by the turbine if the heat added in the boiler is 2100 kJ/s.arrow_forwardA heating plant for a large medical campus requires 5506 MBH (1MBH \= 1,000,000 btuh) of heating capacity. Which of the following pipe size and velocity in feet per second (fps) for the main would be needed if the plant is a 62 psig medium-pressure steam system? (Hint: Table 7.2) a.8" pipe at 130 fps b.4" pipe at 150 fps c.2" pipe at 100 fps d.4" pipe at 130 fps e.5506 MBH; 62 psigarrow_forward
- a forward feed triple effect evaporator is used to fed 13608 kg/hr of NaOH solution containing 10 wt% solute. the entering feed temperature is 37.8°c. it is to be concentrated to a 50% NaOH solution. the steam used to enter at 58.6 kpa gage. the absolute pressure in the vapor space of the third effect is 6.76 kpa. the heat transfer coefficient are u1=6246, u2=3407, and u3=2271 w/m²k. all effects must have the same area. calculate the surface area and steam consumption Show steps and solutions .arrow_forwardPlease Help,will provide helpful e Ratings for correct solution. Thank You. Water flows through a horizontal coil through which high-temperature flue gas passes. As water passes through the coil, it passes from the liquid phase at 200 kPa and 80°C to the vapor phase at 100 kPa and 125°C. The entry speed of water into the coil is 3 m/s and the exit speed of steam is 200 m/s. Calculate the heat transferred per unit mass of water through the coil? The enthalpies of the inlet and outlet streams are given as 334.9 kJ/kg and 2726.5 kJ/kg, respectively.arrow_forwardThe mass flow rate, specific heat, and inlet temperature of the tube-side stream in a double-pipe, parallel-flow heat exchanger are 2700 kg/h, 2.0 kJ/kg·K, and 120°C, respectively. The mass flow rate, specific heat, and inlet temperature of the other stream are 1800 kg/h, 4.2 kJ/kg·K, and 20°C, respectively. The heat transfer area and overall heat transfer coefficient are 0.50 m2 and 2.0 kW/m2·K, respectively. Find the outlet temperatures of both streams in steady operation using (a) the LMTD method and (b) the effectiveness–NTU method.arrow_forward
- Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning