Problem 4 ( A concentrating solar power collector system provides energy by heat transfer (heat input) to a power cycle a rate of 3 MW. The cycle thermal efficiency, defined as the ratio of work output to the heat input, is 32%. What is the work output, in MWh for 4380 hours of steady-state operation? Note that the work is valued at $0.08/kWh. A. 336 MWh B. 4,205 MWh C. 13,140 MWh D. 41,063 MWh Problem 5 ( A household has a 6m x 8m brick wall with a thickness of 25cm and a thermal conductivity of 0.69 W/m°C. During the winter, the temperature of the air inside the house is 25°C and the average outdoor air temperature is 4°C. Determine the rate of heat transfer through the wall, in W. (Choose nearest value) A. 2082 W B. 2782 W C. 3782 W D. 4782 W Problem 6( An exposed 8 cm external diameter, 20 m long hot-water pipe at 80°C is losing heat to the surrounding (outdoor) air by natural convection. The average outdoor temperature is 5°C. The heat transfer coefficient is 25 W/m2°C. What is the heat loss by natural convection, in kW? A. 9.4 W B. 10.0 W C. 10.4 W
Problem 4 ( A concentrating solar power collector system provides energy by heat transfer (heat input) to a power cycle a rate of 3 MW. The cycle thermal efficiency, defined as the ratio of work output to the heat input, is 32%. What is the work output, in MWh for 4380 hours of steady-state operation? Note that the work is valued at $0.08/kWh. A. 336 MWh B. 4,205 MWh C. 13,140 MWh D. 41,063 MWh Problem 5 ( A household has a 6m x 8m brick wall with a thickness of 25cm and a thermal conductivity of 0.69 W/m°C. During the winter, the temperature of the air inside the house is 25°C and the average outdoor air temperature is 4°C. Determine the rate of heat transfer through the wall, in W. (Choose nearest value) A. 2082 W B. 2782 W C. 3782 W D. 4782 W Problem 6( An exposed 8 cm external diameter, 20 m long hot-water pipe at 80°C is losing heat to the surrounding (outdoor) air by natural convection. The average outdoor temperature is 5°C. The heat transfer coefficient is 25 W/m2°C. What is the heat loss by natural convection, in kW? A. 9.4 W B. 10.0 W C. 10.4 W
Physics for Scientists and Engineers with Modern Physics
10th Edition
ISBN:9781337553292
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter21: Heat Engines, Entropy, And The Second Law Of Thermodynamics
Section: Chapter Questions
Problem 5P: A freezer has a coefficient of performance of 6.30. It is advertised as using electricity at a rate...
Related questions
Question
First i apeal of request to solve all questions with ßolutions ok if u domt solve all then skip please other wise iw ill dislike if u dont solve all .solve all i req again thanks
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution!
Trending now
This is a popular solution!
Step by step
Solved in 5 steps with 4 images
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Recommended textbooks for you
Physics for Scientists and Engineers with Modern …
Physics
ISBN:
9781337553292
Author:
Raymond A. Serway, John W. Jewett
Publisher:
Cengage Learning
Physics for Scientists and Engineers with Modern …
Physics
ISBN:
9781337553292
Author:
Raymond A. Serway, John W. Jewett
Publisher:
Cengage Learning