A jacketted-agitated vessel, fitted with a turbine agitator, is used for heating a water stream from 10°C to 54°C. The average heat transfer coefficient for water at the vessel's inner-wall can be estimated from Nu = 0,76Re2/3Pr1/3, Saturated steam at 100°C condenses in the jacket, for which the average heat transfer coefficient in kW /m2.K is ho = 13.1(T,- Tw)-0.25, The vessel dimensions are D, = 0.6 m, H = 0.6 m and Da= 0.2 m. The agitator speed is 60 rpm. Calculate the mass rate of water that can be heated in this agitated vessel steadily. %3D

A jacketted-agitated vessel, fitted with a turbine agitator, is used for heating a water stream from 10°C to 54°C. The average heat transfer coefficient for water at the vessel's inner-wall can be estimated from Nu = 0,76Re2/3Pr1/3, Saturated steam at 100°C condenses in the jacket, for which the average heat transfer coefficient in kW /m2.K is ho = 13.1(T,- Tw)-0.25, The vessel dimensions are D, = 0.6 m, H = 0.6 m and Da= 0.2 m. The agitator speed is 60 rpm. Calculate the mass rate of water that can be heated in this agitated vessel steadily. %3D

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter6: Forced Convection Over Exterior Surfaces

Section: Chapter Questions

Problem 6.48P

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A jacketted-agitated vessel, fitted with a turbine agitator, is used for heating a water stream from 10°C to 54°C. The average heat transfer coefficient for water at the vessel’s inner-wall can be estimated from Nu = 0.76Re2/3Pr1/3. Saturated steam at 100°C condenses in the jacket, for which the average heat transfer coefficient in kW/m2·K is ho=5 13.1(Tg - Tw)20.25. The vessel dimensions are Dt = 0.6 m, H = 0.6 m and Da = 0.2 m. The agitator speed is 60 rpm. Calculate the mass rate of water that can be heated in this agitated vessel steadily.
Steam is to be condensed on the shell side of a 1-shellpass and 8-tube-passes condenser, with 50 tubes in each pass,at 308C (hfg 5 2431 kJ/kg). Cooling water (cp 5 4180 J/kg?K)enters the tubes at 158C at a rate of 1800 kg/h. The tubes arethin-walled, and have a diameter of 1.5 cm and length of 2 mper pass. If the overall heat transfer coefficient is 3000 W/m2?K,determine (a) the rate of heat transfer and (b) the rate of condensation of steam.
A double pass water-cooled shell-and-tube type condenser has a total number of tubes equal to 42. The tubes are of 14 mm inside diameter, 16 mm outside diameter and 4 m length. The overall heat transfer coefficient is 3510 kJ/hr-m2 -°C. Cooling water enters the condenser at 25°C at a velocity of 1.5 m/s and leaves with a temperature rise of 6.5°C. (a) Calculate the outside heating surface area of the tubes in m2 ; (b) Determine the mass flow rate of water in kg/s and the volumetric flow rate in L/s (using an average density of 996.5 kg/m3 ); (c) Estimate the condensing temperature of the refrigerant; (d) If the ammonia refrigerant enters and leaves the condenser at saturation conditions, compute the mass flow rate of the refrigerant and the condenser pressure in kPa.
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What is application of parallel flow heat exchanger? and counter flow heat exchanger?
Saturated water vapor at 100°C condenses in a 1-shell and 2-tube heat exchanger with a surface area of 0.5 m2 and an overall heat transfer coefficient of 2000 W/m2·K. Cold water (cpc = 4179 J/kg·K) flowing at 0.5 kg/s enters the tube side at 15°C, determine (a) the heat transfer effectiveness, (b) the outlet temperature of the cold water, and (c) the heat transfer rate for the heat exchanger.
A two pass steam surface condenser is to be designed to condense 10000 kg/hr of steam having an enthalpy of 2240 kj/kg. Condenser pressure is 13.79 kpa. circulating water enters the condenser at 25 C and leaves at 40 C. the outside and inside diameter for a water tube, OD=20 mm, ID = 17 mm and water velocity of 3 m/s. if the overall coefficient of the heat transfer is 14100 kj/hr-m-C of outside tube surface, determine the amount of circulating water in m/hr.
Saturated water vapor at 100°C condenses in the shell side of a one-shell and two-tube heat exchanger with a surface area of 0.5 m2 and an overall heat transfer coefficient of 2000 W/m2·K. Cold water (cpc = 4179 J/kg·K) flowing at 0.5 kg/s enters the tube side at 15°C, determine the outlet temperature of the cold water and the heat transfer rate for the heat exchanger.
In a once-through boiler, feedwater enters through the bottom og tubes, receives heat from combustion of coal, and escapes from the top of the tubes as superheated steam, calculate the heat transfer coefficients of water and superheated steam using the following data: Pressure of feedwater at tube inlet = 27.0 MPa Absolute temperature of feedwater, Tf =563 K Pressure of superheated steam at tube outlet = 24.5 MPa Absolute Temperature of superheated steam, Tg = 838 K Velocity of Feedwater through each tube. Vf = 6 m/s internal diameter of each tube = 63.5 mm Length of pipe = 30m
What are baffles? Why we use baffles in heat exchangers?
Steam is to be condensed on the shell side of a 1-shell-pass and 8-tube-passes condenser, with 50 tubes in each pass, at 30°C (hfg = 2431 kJ/kg). Cooling water (cp = 4180 J/kg·K) enters the tubes at 15°C at a rate of 1800 kg/h. The tubes are thin-walled, and have a diameter of 1.5 cm and length of 2 m per pass. If the overall heat transfer coefficient is 3000 W/m2·K, determine (a) the rate of heat transfer and (b) the rate of condensation of steam.
Ethylene glycol is heated from 25°C to 40°C at a rate of 2.5 kg/s in a horizontal copper tube (k = 386 W/m·K) with an inner diameter of 2.0 cm and an outer diameter of 2.5 cm. A saturated vapor (Tg = 110°C) condenses on the outside-tube surface with the heat transfer coefficient (in kW/m2·K) given by 9.2/(Tg - Tw)0.25, where Tw is the average outside-tube wall temperature. What tube length must be used? Take the properties of ethylene glycol to be r = 1109 kg/m3, cp = 2428 J/kg·K, k = 0.253 W/m·K, m = 0.01545 kg/m·s, and Pr = 148.5.