Fundamentals of Heat and Mass Transfer
7th Edition
ISBN: 9780470501979
Author: Frank P. Incropera, David P. DeWitt, Theodore L. Bergman, Adrienne S. Lavine
Publisher: Wiley, John & Sons, Incorporated
expand_more
expand_more
format_list_bulleted
Videos
Textbook Question
Chapter 10, Problem 10.17P
Consider a gas-fired boiler in which five coiled, thin-walled, copper tubes of 25-mm diameter and 8-m length are submerged in pressurized water at 4.37 bars. The walls of the tubes are scored and may be assumed to be isothermal. Combustion gases enter each of the tubes at a temperature of
(a) Determine the tube wall temperature
(b) Over time the effects of scoring diminish, leading to behavior similar to that of a polished copper surface. Determine the wall temperature and gas outlet temperature for the aged condition.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Estimate the power required to boil the water in a copper pan (Cs,f = 0.013 and n = 1), 180 mm in diameter. The bottom of the pan is maintained at 115 ℃ by the heating element of an electric range. Properties of Water (1 atm): Tsat = 100℃, ρl = 957.9 kg/m3, ρv = 0.5955 kg/m3, Cpl = 4217 J/kg.K, μl = 279*10^-6 N.s/m2, Prl = 1.76, hfg = 2257 kJ/kg, σ = 58.9*10^-3 N/m.
Select one:
a. 16420 W
b. 18166 W
c. 16240 W
d. 11760 W
The condenser of a steam power plant consists of AISI 302 Stainless steel tubes, each with outer and inner diameters of 35 mm and 30 mm, respectively. Saturated steam at 0.135 bar condenses on the outer surface of the tube, while water at a mean temperature of 295 K is in fully developed flow through the tube (you can assume that 295 K is the mean temperature in the axial direction of the tube (e.g. along its length) or you may assume that the inlet water temperature is 295 K).
For a water mass flow rate of 0.22 kg/s, what is the outer surface temperature of the tube and the rates of heat transfer and steam condensation per unit tube length? As an approximation you may evaluate the properties of the liquid film at the saturation temperature.
QUESTION 3
A multi-stage steam turbine exhausts into a two-pass surface
condenser operating at a pressure of 10kPa. The steam enters
the condenser with a dryness fraction of 0.85 and the condensate
leaves the condenser at a temperature of 34.6°C. The tubes have
an inside diameter of 18mm and a wall thickness of 1mm. Coolina
water circulates through the tubes at a speed of 1.2m/s. The stean
flows through the condenser at a rate of 2400kg/hr and air leaks
into the system at a rate of 0.5kg/1000kg of steam condensed.
Calculate:
3.1
the capacity of the air pump in m2/min.
Chapter 10 Solutions
Fundamentals of Heat and Mass Transfer
Ch. 10 - Show that, for water at 1-atm pressure with...Ch. 10 - The surface of a horizontal. 7-mm-diameter...Ch. 10 - The role of surface tension in bubble formation...Ch. 10 - Estimate the heat transfer coefficient, h,...Ch. 10 - Prob. 10.5PCh. 10 - Prob. 10.6PCh. 10 - Prob. 10.7PCh. 10 - Prob. 10.8PCh. 10 - Calculate the critical heat flux on a large...Ch. 10 - Prob. 10.11P
Ch. 10 - Prob. 10.12PCh. 10 - Prob. 10.13PCh. 10 - Prob. 10.15PCh. 10 - Prob. 10.16PCh. 10 - Consider a gas-fired boiler in which five coiled,...Ch. 10 - Prob. 10.18PCh. 10 - Prob. 10.19PCh. 10 - Prob. 10.20PCh. 10 - Prob. 10.22PCh. 10 - Prob. 10.24PCh. 10 - Prob. 10.25PCh. 10 - A small copper sphere, initially at a uniform,...Ch. 10 - Prob. 10.28PCh. 10 - A disk-shaped turbine rotor is heat-treated by...Ch. 10 - A steel bar, 20 mm in diameter and 200 mm long,...Ch. 10 - Electrical current passes through a horizontal....Ch. 10 - Consider a horizontal. D=1 -mm-diameter platinum...Ch. 10 - Prob. 10.34PCh. 10 - Prob. 10.35PCh. 10 - Prob. 10.36PCh. 10 - Prob. 10.37PCh. 10 - A polished copper sphere of 10-mm diameter,...Ch. 10 - Prob. 10.39PCh. 10 - Prob. 10.40PCh. 10 - Consider refrigerant R-134a flowing in a smooth,...Ch. 10 - Determine the tube diameter associated with p=1...Ch. 10 - Saturated steam at 0.1 bar condenses with a...Ch. 10 - Prob. 10.45PCh. 10 - Prob. 10.46PCh. 10 - Prob. 10.47PCh. 10 - Prob. 10.48PCh. 10 - Prob. 10.50PCh. 10 - Prob. 10.53PCh. 10 - The condenser of a steam power plant consists of...Ch. 10 - Prob. 10.56PCh. 10 - Prob. 10.61PCh. 10 - Prob. 10.62PCh. 10 - A technique for cooling a multichip module...Ch. 10 - Determine the rate of condensation on a 100-mm...Ch. 10 - Prob. 10.66PCh. 10 - Prob. 10.67PCh. 10 - Prob. 10.70PCh. 10 - Prob. 10.71PCh. 10 - Prob. 10.74PCh. 10 - Prob. 10.75PCh. 10 - A thin-walled cylindrical container of diameter D...
Additional Engineering Textbook Solutions
Find more solutions based on key concepts
The moment of inertia Iy for the slender rod in terms of the rod’s total mass m .
Engineering Mechanics: Statics & Dynamics (14th Edition)
A 20-lb force is applied to the control rod AB as shown. Knowing that the length of the rod is 9 in. and that t...
Statics and Mechanics of Materials
3.3 It is known that a vertical force of 200 lb is required to remove the nail at C from the board. As the nail...
Vector Mechanics for Engineers: Statics
23.23 A highly oxidized and uneven round bar is being turned on a lathe. Would you recommend a small or a large...
Manufacturing Engineering & Technology
Locate the centroid of the area. Prob. 9-17
Engineering Mechanics: Statics
Steady state conduction rate to the warm compressor to the net power produces theoretically by thermodynamic ba...
Introduction to Heat Transfer
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Ethylene glycol with a mass flow rate of 0.01 kg / sec flows in a thin-walled pipe with a diameter of 3 mm. The pipe is in the form of a serpentine, and was lifted into a well-mixed water bath at 25 ° C. Calculate the heat transfer and pipe length required for the fluid to enter the pipe at 85 ° C and exit at 35 ° C?arrow_forwardPravinbhaiarrow_forwardCatalogue data of a water-cooled condenser of a manufacturer gives the following details: Condensing temperature 48.9°C Water inlet temperature 37.8°C Water flow rate 20.694 kg/s Capacity 145 tons Estimate the capacity of this condenser with the same water flow rate but with an inlet temperature of 30°C and a condensation temperature of 42°C. The evaporation temperature may be assumed to be constant at 2.2°C.arrow_forward
- A two effect system of evaporators with parallel forward feed flow of liquid and vapor is to be designed to concentrate continuously 10,000 Ib/h of a 10% by weight solution to 40%, the feed being at 150 °F. It is planned to use saturated steam condensing at 220 °F. Specific Heat of feed liquor is 0.9, while that leaving the first effect is equal to the average specific heat of feed and product. The overall heat transfer coefficients are 300 and 400 BTU/(f2-hr-°F) for the first and second effects respectively. The latent heat of vaporization for the vapor leaving the first effect is 1002.3 BTU/lb and 1020 BTU/lb for the second. Calculate for the steam economy and the heat transfer area in each effect. Given: (1) Required: andarrow_forwardA shell-and-tube heat exchanger is used to cool compressed liquid methanol from 176 °F to 104 °F. The methanol flows on the shell side of the exchanger. The coolant is water that rises in temperature from 50 °F to 86 °F and flows within the tubes at a rate of 68.9 kg s1. Finding the appropriate thermophysical data and applying the proper equations, you are required to do the following: (a) Calculate i) methanol mass flow rate in the exchanger, ii) methanol volumetric flowrate at the inlet of the exchanger. (b) i) For the counter-current flow of the fluids calculate the log temperature difference, ii) explain the purpose of calculating this difference, iii) explain, quantitatively, why is the counter-current flow in heat exchangers preferred to co-current flow. meanarrow_forwardA Horizontal Return Fire-Tube Boiler in 60 inches in diameter, 16 ft long, has 70 tubes that are 3 inches O.D with 0.109-inch tube thickness. If was found that the boiler’s steam rate is 0.50 kg/s and the factor of evaporation is 1.25. What is the Percent (%) Rating of the Boiler?arrow_forward
- 2 m^3/min of a light oil are to be heated from 20C to 100C (with zero vaporization) in an exchanger using 250 kPa steam of 90% quality. The heat losses to the surrounding air have been estimated to be 5% of the heat transferred from the condensing steam to the oil. If the steam condensate leaves at its saturation point, what mass of steam perhour will be used in the exchanger? For light oil, Specific gravity= 0.88Specific heat= 2.00 kJ/kg-KFor steam at 250 kPa,Saturated liquid: hf= 535.49 kJ/kgvf=0.001067 m^3/kgSaturated vapor: hg= 2716.8 kJ/kgvg= 0.7188 m^3/kgarrow_forwardA spray condenser is to be used to condense steam at a pressure of 0.105 bar (Tat using water at 27° C. The injection velocity of the drops is 6 m/s and their mean diameter is 2 mm. How long must the condenser vessel be to achieve 95% utilization of the cooling water? (Use vapor properties at 320 K and liquid properties at 310 K.) 320 K)arrow_forwardWater at 900 C and a rate of 0.5 kg/s is cooled to 45° C in a copper pipe of 2 cm outer diameter and 2 mm thickness by a vapor that is condensing on its outer surface at 30° C: a. Determine the pipe length. b. Determine the pressure drop.arrow_forward
- Carbon dioxide (CO:) is used for the gas cooled reactor in shell and tube heat exchanger type steam generator (shown in Figure 2). 90000 kg/h entered to the exchanger under pressure and temperature of 4 bar and 500 °C respectively. The steam saturation temperature is 250 °C when the carbon dioxide leave the generator at 330°C. Presume the formed steam is saturated and dry. Using 25 mm inner diameter and 2 mm wall thickness, a copper tube is designed for CO; mass flow rate of 350000 kg/m'h. Neglect the thermal resistance of the steam side. (a) Determine number of tubes that should be used (b) Determine the length of the tubes Take the following properties for the carbon dioxide: Cp=1.172 KI/kg °C; u=0.0000298 Ns/m²; k=0.043 w/m °C; p=3.26 kg/m² Take k (Copper) = 384 W/m °C Water in (cold fluid) - 250°C CO, (hot fluid) in (f = 500°C) CO, out (2 - 330°C) Steam out (2 250°C)arrow_forwarda film-type condenser consists of a packed bed of 3-cm diameter spheres with a voidage of 35%. water sprayed onto the bed at 60oC is used to condense steam entering at the base at a saturation temperature of 100oC. How deep must the bed be to ensure complete condensation of the steam, and what is the outlet temperature of the water? (Use water properties based on the mean of the inlet and outlet water temperatures, and iterate if necessary)arrow_forwardNot Ai generated answers, I need to understand please show all steps.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning
Principles of Heat Transfer (Activate Learning wi...
Mechanical Engineering
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Cengage Learning
Heat Transfer – Conduction, Convection and Radiation; Author: NG Science;https://www.youtube.com/watch?v=Me60Ti0E_rY;License: Standard youtube license