![danieldfuenteg732](/avatars/18661.jpg)
danieldfuenteg732
21.10.2020 •
Chemistry
A boiler operates at steady state. The entering water is saturated liquid at P = 5 bar and has a flow rate of 10,000 kg/hr. The existing steam is also at P = 5 bar and T = 400o C. The pipe entering the boiler is 8 cm in diameter, and the pipe leaving the boiler is 30 cm in diameter. What is the rate at which heat is added in the boiler?
Solved
Show answers
More tips
- F Food and Cooking 10 Ideas for a Wedding Anniversary Gift...
- H Health and Medicine Hangover: How to Get Rid of It Quickly?...
- S Style and Beauty How to Choose the Right Fur Coat and Avoid Regrets?...
- C Computers and Internet How to Create a Folder on Your iPhone?...
- G Goods and services How to sew a ribbon: Tips for beginners...
- F Food and Cooking How to Make Mayonnaise at Home? Secrets of Homemade Mayonnaise...
- C Computers and Internet Which Phone is Best for Internet Surfing?...
- F Food and Cooking Everything You Need to Know About Pasta...
- C Computers and Internet How to Choose a Monitor?...
- H Horoscopes, Magic, Divination Where Did Tarot Cards Come From?...
Answers on questions: Chemistry
- C Chemistry Which is the only kind of orbital in the first energy level...
- C Chemistry One of the disadvantages to use Permanent-mold casting is that you cannot insert cores in the molding. Group of answer choices True False...
- C Chemistry PLEASE HURRY Which type of organic compound is shown below ?...
- C Chemistry A person pushes horizontally with a force of 220. N on a 56.0 kg crate to move it across a level floor. The coefficient of kinetic friction is 0.21. (a) What is the...
- M Mathematics Triangle jkl is shown below. what is measure of j...
- H History What happened at the hartford convention?...
- G Geography How can language lead to revolution?...
- M Mathematics Serena buys 6 composition books and 6 pencils. each composition book cost $3 and the total cost is $24. which equation can you use to find the cost (p) of each pencil...
- E English Excerpt from act iii, scene iii of shakespeare s hamletpolonius. [speaking to king claudius] my lord, he s (hamlet s) going to his mother s (gertrude s) closet. behind...
- B Biology Afoods chain is a good example of what...
Ответ:
The rate at which heat is added in the boiler is 8128.610 kilowatts.
Explanation:
A boiler is a device that works at steady state, whose function is pressurizing and heating water. All gravitational electric and magnetic effects can be neglected. From First Law of Thermodynamics the boiler is characterized by the following model:
Where:
And by the Principle of Mass Conservation we have that:
Where
and
are mass flows at entrance and exit of the boiler, measured in kilograms per second.
Then, we clear the heat transfer rate and expand (Eq. 1) by definitions of enthalpy and kinetic energy, as well as (Eq. 2):
Speeds of fluid entering and exiting the boiler (
), measured in meters per second, are found by applying the following formula:
Where:
Entrance (
,
and
)
Specific enthalpy at given conditions is:
Exit (
,
and
)
Specific enthalpy at given conditions is:
If we know that
,
,
,
,
, the heat transfer rate is:
The rate at which heat is added in the boiler is 8128.610 kilowatts.
Ответ: