Question

BOILER CONDENSER Saturated water vapor Tube-bank 000 000 000 Cooling water in the tubes C Feedwater Heater surface Distilled water A water distillation system includes a boiler and condenser operating together as shown in the figure above. Water evaporated in the boiler is transferred to the condenser where the vapor condenses on a bank of tubes and forms condensate (liquid distilled water) free of contaminants. During steady-state operation, the water evaporates and condenses at the same constant rate. The boiler includes a large horizontal plate with an area of 5 m² made of brass as the heater surface, which is operated at 90% of the critical heat flux. On the condenser side, the tube bank consists of a square array of 100 thin-walled copper tubes, each having a diameter of 27 mm. Cooling water sourced from a nearby river enters the tube bank at 15°C with a total mass flow rate of 90 kg/s. During operation, fouling occurs on the cooling water side corresponding to a fouling factor of 0.0002 m-K/W. The liquid water in the boiler and the vapor transferred to the condenser always remain saturated. Consider steady-state operation. Clearly state and check your assumptions. a) What is the rate of distilled water extraction in kg/s? b) What is the average exit temperature of the cooling water? c) What is the total length of tubing in the tube bank? Imagine there is a similar boiler and condenser system where the tubes with cooling water inside are replaced with a single row containing 10 vertical plates with a height of 1 m. Boundary layers of consecutive plates do not interfere with each other, and the plates are connected to a heat sink which keeps their surface temperature constant at 60°C. As the condenser is operated, a fouling (contact) resistance per unit length of R't = 0.00015t where t is in months develops over the surface of vertical plates. d) What is the length of the vertical plates in the condenser side when there is no fouling (t = 0)? e) If the temperature and dimensions of the vertical plates in the condenser are kept constant, plot the boiler side heater surface temperature and condensation rate for 12 months of operation considering that the water evaporates and condenses at the same rate as each other. You may use any software of your choice for plotting purposes. 

          BOILER
CONDENSER
Saturated water vapor
Tube-bank 000 000 000
Cooling water in the tubes
C
Feedwater
Heater surface
Distilled water

A water distillation system includes a boiler and condenser operating together as shown in the figure above. Water evaporated in the boiler is transferred to the condenser where the vapor condenses on a bank of tubes and forms condensate (liquid distilled water) free of contaminants. During steady-state operation, the water evaporates and condenses at the same constant rate.

The boiler includes a large horizontal plate with an area of 5 m² made of brass as the heater surface, which is operated at 90% of the critical heat flux.

On the condenser side, the tube bank consists of a square array of 100 thin-walled copper tubes, each having a diameter of 27 mm. Cooling water sourced from a nearby river enters the tube bank at 15°C with a total mass flow rate of 90 kg/s. During operation, fouling occurs on the cooling water side corresponding to a fouling factor of 0.0002 m-K/W.

The liquid water in the boiler and the vapor transferred to the condenser always remain saturated.

Consider steady-state operation. Clearly state and check your assumptions.

a) What is the rate of distilled water extraction in kg/s?
b) What is the average exit temperature of the cooling water?
c) What is the total length of tubing in the tube bank?

Imagine there is a similar boiler and condenser system where the tubes with cooling water inside are replaced with a single row containing 10 vertical plates with a height of 1 m. Boundary layers of consecutive plates do not interfere with each other, and the plates are connected to a heat sink which keeps their surface temperature constant at 60°C. As the condenser is operated, a fouling (contact) resistance per unit length of R't = 0.00015t where t is in months develops over the surface of vertical plates.

d) What is the length of the vertical plates in the condenser side when there is no fouling (t = 0)?
e) If the temperature and dimensions of the vertical plates in the condenser are kept constant, plot the boiler side heater surface temperature and condensation rate for 12 months of operation considering that the water evaporates and condenses at the same rate as each other. You may use any software of your choice for plotting purposes.
Show more…
boiler condenser saturatedwatervapor tube bank 000 000 000 coolingwater in the tubes c feed water heater surface distilled water a water distillation system includes a boiler and condenser o 21868

Added by John T.

Close

University Physics with Modern Physics
University Physics with Modern Physics
Hugh D. Young 14th Edition
AceChat toggle button
Close icon
Ace pointing down

Please give Ace some feedback

Your feedback will help us improve your experience

Thumb up icon Thumb down icon
Thanks for your feedback!
Profile picture
BOILER CONDENSER Saturated water vapor Tube-bank 000 000 000 Cooling water in the tubes C Feedwater Heater surface Distilled water A water distillation system includes a boiler and condenser operating together as shown in the figure above. Water evaporated in the boiler is transferred to the condenser where the vapor condenses on a bank of tubes and forms condensate (liquid distilled water) free of contaminants. During steady-state operation, the water evaporates and condenses at the same constant rate. The boiler includes a large horizontal plate with an area of 5 m² made of brass as the heater surface, which is operated at 90% of the critical heat flux. On the condenser side, the tube bank consists of a square array of 100 thin-walled copper tubes, each having a diameter of 27 mm. Cooling water sourced from a nearby river enters the tube bank at 15°C with a total mass flow rate of 90 kg/s. During operation, fouling occurs on the cooling water side corresponding to a fouling factor of 0.0002 m-K/W. The liquid water in the boiler and the vapor transferred to the condenser always remain saturated. Consider steady-state operation. Clearly state and check your assumptions. a) What is the rate of distilled water extraction in kg/s? b) What is the average exit temperature of the cooling water? c) What is the total length of tubing in the tube bank? Imagine there is a similar boiler and condenser system where the tubes with cooling water inside are replaced with a single row containing 10 vertical plates with a height of 1 m. Boundary layers of consecutive plates do not interfere with each other, and the plates are connected to a heat sink which keeps their surface temperature constant at 60°C. As the condenser is operated, a fouling (contact) resistance per unit length of R't = 0.00015t where t is in months develops over the surface of vertical plates. d) What is the length of the vertical plates in the condenser side when there is no fouling (t = 0)? e) If the temperature and dimensions of the vertical plates in the condenser are kept constant, plot the boiler side heater surface temperature and condensation rate for 12 months of operation considering that the water evaporates and condenses at the same rate as each other. You may use any software of your choice for plotting purposes.
Close icon
Play audio
Feedback
Powered by NumerAI
Danielle Fairburn Ivan Kochetkov
Jennifer Stoner verified

Adi S and 55 other subject Physics 101 Mechanics educators are ready to help you.

Ask a new question
*

Labs

-

Want to see this concept in action?

NEW

Explore this concept interactively to see how it behaves as you change inputs.

View Labs
*

Key Concepts

-
Key Concept
Premium Feature
Explore the core concept behind this problem.
Play button
Key Concept
Premium Feature
Explore the core concept behind this problem.
Your browser does not support the video tag.
*

Recommended Videos

-
in-this-problem-you-have-a-steam-power-plant-cycle-coupled-to-a-r410a-refrigeration-cycle-the-mass-flow-rate-of-steam-in-the-steam-power-plant-cycle-is-25-kgs-the-water-is-heated-in-a-boiler-53362

In this problem, you have a steam power plant cycle coupled to an R-410a refrigeration cycle. The mass flow rate of steam in the steam power plant cycle is 2.5 kg/s. The water is heated in a boiler by a furnace, where fuel with a calorific value of 500 kJ/kg is burnt. The work of the turbine is transferred to a pump and a compressor (refrigeration cycle). The exit of the turbine is cooled by a condenser, which exchanges heat with pond water at constant pressure. The pertinent inlet conditions for the steam power plant condenser are provided in the figure. The refrigerant cycle is driven to cool a space to which heat leaks from the ambient at a rate of 0.3 kW per unit area of the space outside surface. The exit of the compressor is cooled in the condenser. Find the following: 1) List the pressures and temperatures at the inlet and exit of all components in the steam power plant. 2) Rate of work done by the turbine and work done on the pump. 3) Mass flow rate of fuel required in the furnace (Hint: energy balance of the boiler). 4) Exit temperature of the pond water in the condenser. 5) Rate of work done on the compressor. 6) Mass flow rate expected for the refrigerant cycle. 7) Heat transfer rate in the condenser of the refrigeration cycle. 8) What can be the surface area of the space for equilibrium. (Hint: energy balance of the evaporator). 9) What do you think are the assumptions in the two cycles (processes), which are practically (in an industry) impossible to achieve? Neglect the effect of any quantity whose value is not provided in the question. List any assumptions made in solving the problem. Use zeroth order interpolation (closest value) wherever necessary. Present your final answer in SI units.

Adi S.
q6a-steel-pipe-carrying-steam-has-an-outside-diameter-of-89-mm-it-is-lagged-with-76-mm-of-insulation-having-an-average-k-0043-wmktwo-thermocouplesone-located-at-the-interface-between-the-pip-28725

Q6. A steel pipe carrying steam has an outside diameter of 89 mm. It is lagged with 76 mm of insulation having an average k = 0.043 W/m·K. Two thermocouples, one located at the interface between the pipe wall and the insulation and the other at the outer surface of the insulation, give temperatures of 115°C and 32°C, respectively. Calculate the heat loss in W per m of pipe. Q7. A metal steam pipe having an outside diameter of 30 mm has a surface temperature of 400 K and is to be insulated with an insulation having a thickness of 20 mm and a k of 0.08 W/m·K. The pipe is exposed to air at 300 K and a convection film coefficient of 30 W/m²·K. a) Calculate the critical radius and the heat loss per m of length for the bare pipe. b) Calculate the heat loss for the insulated pipe assuming that the surface temperature of the pipe remains constant. Q8. A reaction mixture having a Cpm = 2.85 kJ/kg.K is flowing at a rate of 7 260 kg/h and is to be cooled from 377.6 K to 344.3 K. Cooling water at 288.8 K is available and the flow rate is 4 536 kg/h. The overall heat transfer coefficient Uo is 653 W/m²K. a) For counterflow, calculate the outlet water temperature and the area Ao of the exchanger. b) Repeat calculations for cocurrent flow. Q9. Oil flowing at the rate of 7 258 kg/h with a Cpm = 2.01 kJ/kg · K is cooled from 394.3 K to 338.9 K in a countercurrent flow heat exchanger by water entering at 294.3 K and leaving at 305.4 K. Calculate the flow rate of the water and the overall heat transfer coefficient Ui if the Ai is 5.11 m². Q10. Water flowing at the rate of 13.85 kg/s is to be heated from 54.5 to 87.8°C in a heat exchanger by 54 430 kg/h of hot gas flowing countercurrent flow and entering at 427°C (Cpm = 1.005 kJ/kg · K). The overall heat transfer coefficient Uo = 69.1 W/m²K. Calculate the exit-gas temperature and the heat-transfer area. Q11. A plane wall is constructed of a material having a thermal conductivity that varies as the square of the temperature according to the relation k = k0(1 + βT²). Derive an expression for the heat transfer in such a wall (k0 and β are constants).

Adi S.
in-a-blanching-process-at-a-food-factory-it-is-necessary-to-replace-contaminated-hot-water-with-clean-fresh-water-supplied-at-the-rate-of-7-litresmin-a-waste-heat-survey-revealed-that-the-pr-35567

In a blanching process at a food factory, it is necessary to replace contaminated hot water with clean fresh water supplied at the rate of 7 liters/min. A waste heat survey revealed that the process operated for 37 hours/week, 47 weeks per year, and that heat was provided by fuel oil costing $292 per tonne. The fuel oil has a calorific value of 44.5 MJ/kg. The boiler (which heats the water) has an efficiency of 74%. The water temperature at the inlet to the boiler is 13°C and at its outlet is 93°C. The hot water is transmitted from the boiler to the process via insulated pipes. The temperature of the water reaching the process is 92°C, and after passing through the process, the temperature of the water is 81°C. This water typically drains to waste as it is contaminated after passing through the process. A plate and frame heat exchanger with an installed cost of $6100 and additional annual running costs of $800 (additional pump energy to power the heat exchanger, maintenance, etc.) and an effectiveness of 77% is being considered for reducing energy costs. What is the cost of supplying the energy required for heating the water in the boiler (in $/kWh)? (That is, what is the cost of 1 kWh of energy supplied to the water.) 2. What would be the maximum rate that waste heat could be recovered (in kW)? (Assume all the heat that remains in the hot water after the process could be transferred to the incoming cold water, the process occurs at a constant pressure (1 atm), and for water Cp = 4.18 kJ/(kg°C). 3. What will be the actual heat recovery rate in kW? 4. What will be the "cool" water temperature when it leaves the heat exchanger? 5. What will be the temperature, in °C, of the "hot" waste water when it leaves the heat exchanger? 6. How much heat will be recovered annually (in kWh/year)? 7. What is the annual dollar value of the recovered waste heat? 8. What would be the simple payback period in years for such a system?

Suman K.
*

Recommended Textbooks

-
University Physics with Modern Physics

University Physics with Modern Physics

Hugh D. Young 14th Edition
achievement 1,286 solutions
Physics: Principles with Applications

Physics: Principles with Applications

Douglas C. Giancoli 7th Edition
achievement 1,503 solutions
Fundamentals of Physics

Fundamentals of Physics

David Halliday, Robert Resnick , Jearl Walker 10th Edition
achievement 1,070 solutions
*

Transcript

-
00:01 First here we have a table and there is pressure and temperature first second third and fourth now the pressures are 2 mpa 2 mpa 63 .027 kpa and 63 .027 kpa temperature is 212 .38 degree celsius 520 degree celsius 89 .28 degree celsius and 89…
Need help? Use Ace
Ace is your personal tutor. It breaks down any question with clear steps so you can learn.
Start Using Ace
Ace is your personal tutor for learning
Step-by-step explanations
Instant summaries
Summarize YouTube videos
Understand textbook images or PDFs
Study tools like quizzes and flashcards
Listen to your notes as a podcast
Continue solving this problem
Create a free account to:
  • View full step-by-step solution
  • Ask follow-up questions with Ace AI
  • Save progress and study later
Continue Free
Numerade

Get step-by-step video solution
from top educators

Continue with Clever
or



By creating an account, you agree to the Terms of Service and Privacy Policy
Already have an account? Log In

A free answer
just for you

Watch the video solution with this free unlock.

Numerade

Log in to watch this video
...and 100,000,000 more!


EMAIL

PASSWORD

OR
Continue with Clever