Reference no: EM131233575
Consider the heat engine in Problem 8.111. The exit temperature was given as 800 K, but what are the theoretical limits for this temperature? Find the lowest and highest temperatures, assuming the heat transfers are as given. For each case, give the first and second-law efficiencies.
Problem 8.111
Air flows into a heat engine at ambient conditions of 100 kPa, 300 K, as shown in Fig. P8.111. Energy is supplied as 1200 kJ per kilogram of air from a 1500 K source, and in some part of the process a heat transfer loss of 300 kJ/kg air occurs at 750 K. The air leaves the engine at 100 kPa, 800 K. Find the first- and second-law efficiencies.
![22_37f1c78c-98b2-4a29-a432-5bd9de072028.png](https://secure.expertsmind.com/CMSImages/22_37f1c78c-98b2-4a29-a432-5bd9de072028.png)
Q80
1. A small air gun has 1 cm3 of air at 250 kPa, 27?C. The piston is a bullet of mass 20 g. What is the highest potential velocity with which the bullet can leave?
2. Consider the nozzle in Problem 7.154. What is the second-law efficiency for the nozzle?
Problem 7.154
A nozzle in a high-pressure liquid water sprayer has an area of 0.5 cm2. It receives water at 350 kPa, 20?C and the exit pressure is 100 kPa. Neglect the inlet kinetic energy and assume a nozzle isentropic efficiency of 85%. Find the ideal nozzle exit velocity and the actual nozzle mass flow rate.
Explain by showing algebraic steps
: Explain by showing algebraic steps, with words, or a combination of both how you know your line and the line 3x + y = 4 are parallel, but not the same.
|
Total amount of money in the cash register
: A cash register contains only five dollar and twenty dollar bills. It contains four times as many five dollar bills as twenty dollar bills and the total amount of money in the cash register is $640.
|
Identify a specific model for evidence based staff training
: Discuss other potential reasons for the increase in inappropriate behaviors at Global Ed. Is staff training the only solution? What are other considerations and environmental variables to evaluate?
|
Use social media tools for marketing purposes
: Three-quarters of U.S. companies now use social media tools for marketing purposes. Demonstrate your knowledge of social media by describing a small company and the ways you would use social media to produce, promote, place, and price your goods or s..
|
What is the second-law efficiency for the nozzle
: A small air gun has 1 cm3 of air at 250 kPa, 27?C. The piston is a bullet of mass 20 g. What is the highest potential velocity with which the bullet can leave?
|
What economic or rmspecic news had the highest eect
: Comment on outperforming and underperforming securities in your portfolio. What economic or rmspecic news had the highest eect on your performance?
|
The internet lead to more empowered customers
: In what sense does the Internet lead to more empowered customers? How does selling over the Internet lead to radical changes in how prices are managed?
|
Nonempty set of real numbers
: Let A be a nonempty set of real numbers. Prove that A is bounded in the sense of 1.3.1 if and only if there exists a positive real number K such that |x|
|
Determine the minimum size screen for each deck
: Determine the minimum-size screen for each deck, expressed in square feet, required to handle the output of the crusher. If the screening unit is 4 ft wide, what will be the nominal screen sizes?
|