Q3// a saturated steam is to be condensed at a temperature of 50 °C to produce a saturated water. The cooling water is drawn from a nearby lake, and enters the tubes of the condenser at 18 °C and leaves it at 27 °C. The surface area of the tubes is 58m and the overall heat transfer coefficient is 2400 W/m.°C. Assuming counter flow, determine: 1. The mass flow rate of the cooling water needed. 2. The rate of steam condensation. 3. The effectiveness of this condenser. Answer :( 99.9 kg/s, 1.57717 kg/s ,28.3%)

Q3// a saturated steam is to be condensed at a temperature of 50 °C to produce a saturated water. The cooling water is drawn from a nearby lake, and enters the tubes of the condenser at 18 °C and leaves it at 27 °C. The surface area of the tubes is 58m and the overall heat transfer coefficient is 2400 W/m.°C. Assuming counter flow, determine: 1. The mass flow rate of the cooling water needed. 2. The rate of steam condensation. 3. The effectiveness of this condenser. Answer :( 99.9 kg/s, 1.57717 kg/s ,28.3%)

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.

Chapter7: Forced Convection Inside Tubes And Ducts

Section: Chapter Questions

Problem 7.49P

See similar textbooks

Similar questions

Refrigerators currently being manufactured in the United States are using______as their refrigerant.
Welded ______sealed compressors are normally used in household refrigerators.
Consider an 80 MW coal-fired steam power plant that runs on a reheat Rankine cycle. Steam enters the high-pressure turbine at 10 MPa and 500°C and the low-pressure turbine at 1 MPa and 500°C. Steam leaves the condenser as a saturated liquid at 10 kPa. Determine the volume flow rate of sea water (S.G. = 1.05) used in the condenser, if the allowable temperature rise is 5°C. in cubic meters per hour
a power plant steam, steam is continuously extractedfromthe turbine and in a heat exchanger there is a condensation of the extracted steam. The energy released during condensation of steam is used to operate a heat engine. A heat engine receives thermal energy at a rate of 1200 kJ/hr from condensing steam and rejects waste heat to a lake at 20°C at a rate of 800 kJ/hr. Determine the lowest possible condensing steam temperature.
An industrial plant needs 20,000 lbm of saturated steam at 280oF per hour for heating purposes and ten MW of electrical power. A small turbine system is to be designed to handle both of these needs. Steam is supplied to a turbine at 400 psia pressure from a boiler and expanded until 280oF saturated steam is obtained whereupon the steam needed for heating is extracted. The rest of the steam is expanded in a second turbine to a condenser pressure of 5 psia, where it is condensed, compressed to 400 psia and returned to the boiler. The heating steam returns as a liquid at 200oF and 1 atm pressure where it is compressed to 400 psia and returned to the boiler. Both turbines have an efficiency of 72% and both feed water pumps have an efficiency of 50%. The power from the turbines is used to drive the feed water pumps. (a) At what temperature must the steam be generated in the boiler to supply the 280oF saturated heating steam? (b) How much steam must the boiler supply? (c) If one pound of…
Refrigerant-134a enters the compressor of a refrigerator as superheated vapour at 0.20 MPaand 25°C at a rate of 0.07 kg/s, and it leaves at 1.2 MPa and 100°C. The refrigerant is cooledin the condenser to 44°C and 1.2 MPa, and it is throttled to 0.20 MPa. Disregarding any heattransfer and pressure drops in the connecting lines between the components,2.1 Calculate the rate of heat removal from the refrigerated space and the power input tothe compressor,2.2 Calculate the isentropic efficiency of the compressor, and2.3 Calculate the Coefficient of Performance of the refrigerator
In a power plant steam, steam is continuously extracted from the turbine and in a heat exchanger there is a condensation of the extracted steam. The energy released during condensation of steam is used to operate a heat engine. A heat engine receives thermal energy at a rate of 1200 kJ/min from condensing steam and rejects waste heat to a lake at 25°C at a rate of 850 kJ/min. Determine the lowest possible condensing steam temperature.
Ethanol is vaporized at 788C (hfg 5 846 kJ/kg) in adouble-pipe parallel-flow heat exchanger at a rate of 0.03 kg/sby hot oil (cp 5 2200 J/kg?K) that enters at 1208C. If the heattransfer surface area and the overall heat transfer coefficientsare 6.2 m2and 320 W/m2?K, respectively, determine the outlettemperature and the mass flow rate of oil using (a) the LMTDmethod and (b) the e2NTU method.
8.3 A four-effect evaporator is being considered for concentratinga fruit juice that has no appreciable boiling-point elevation.Steam is available at 143.27 kPa, and the boiling point ofthe product in the fourth effect is 45°C. The overall heat-transfer coeffi cients are 3000 W/(m 2 °C) in the fi rst effect,2500W/(m2 °C) in the second effect, 2100W/(m2°C) in thethird effect, and 1800W/(m2°C) in the fourth effect. Calculatethe boiling-point temperatures of the product in the fi rst,second, and third effects. Assume the heating areas in all theeffects are equal to 50m2 each. The mass fl ow rate of steam tothe fi rst effect is 2400kg/h, the feed rate to the fi rst effect of 5%total solids fl uid is 15,000kg/h, the concentrated product fromthe fi rst effect leaves at 6.25% total solids, and the concentrationof product leaving the second effect is 8.82% total solids. Make it in the form of a spreadsheet for solving the example problem no. 8.2 and 8.3
Water enters the single shell,two-pass heat exchanger at 16°C and leaves at 40°C. It is heated by gases that enter at 120°C and leave at 38°C. Determine the true mean temperture difference. A. 44.93K B. 36K C. 27K D. 50K
A 540,000 kJ/h capacity refrigeration system using Refrigerant 22 and served by a single compressor unit operates at an evaporator temperature of -23 oC and a condensing saturation temperature 40oC. To get rid of the single compressor load, a modification is proposed to use two stage of compression with refrigerant intercooling. (a) Determine the power required in the original system. (b) Determind the power required for the proposed modified system.
A 3 cylinder 100 x 200 mm ammonia compressor with a compression efficiency of 86% operates with a suction pressure of 291.57 kPa and a condenser pressure of 1557 kPa at 18 rps. The refrigerant cools 1.8 kg/s of water from 28 0C to 3 0C and assuming 7 % of the useful refrigerating effect is lost due to the process of cooling and h2 = 1710 kJ/kg and clearance volume is 7 %. determine: G. volume flow rate at suction H. displacement volume I. clearance volumetric efficiency J. actual volumetric efficiency