A house has an indoor temperature of 336 K while the outdoor temperature is 280 K....
A house has an indoor temperature of 336 K while the outdoor temperature is 280 K. If there is a steady heat transfer rate of 1,855 W through a window of the house, what is the rate of entropy generation in this process in W/K?
Homework Answers
Entropy generation = Q(1/lower temp -1/higher temp)
1885*(1/280-1/336) = 1.122 W/ K
Actually principle behind this expression is lower temp gain heat so positive while high temperature lose heat so negative
There differenence is entropy generation
Add Answer to:
A house has an indoor temperature of 336 K while the outdoor
temperature is 280 K....
Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm-thick layers of glass (k =...
Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm-thick layers of glass (k = 0.78 W/m K) separated by a 12-mm-wide stagnant air space (k = 0.026 W/m K). Determine the steady rate of heat transfer through this double-pane window. R . and all the surface temperatures (inner and outer of each pane) within the circuit (which you will draw and correctly label) for a day during which the room is maintained at 24°C while the temperature of...
A system executes a power cycle while receiving heat transfer at a temperature of 1000 K...
A system executes a power cycle while receiving heat transfer at a temperature of 1000 K and discharging 1000 kJ by heat transfer at a temperature of 450 K. There are ho other heat transfers. Appling the lausus Inequality, determine entropy generation, if the thermal efficiency is 50%. Also comment if the cycle is 15. Extra-credit (10 Pts.) reversible, irreversible, or impossible? Explain your reasoning. press entropy balance using heat engine efficiency in terms of O's. Remember this is not...
For questions 9-12: outdoor temperature is-20"F and indoor temperature is 68 F.Cakculate losses for a 100...
For questions 9-12: outdoor temperature is-20"F and indoor temperature is 68 F.Cakculate losses for a 100 ft x 120ft x 10 ft. high rectangular building (For this problem you may ignore wall thicknesses) 9. Find the total heat loss (BTUH) through the roof assembly with R-33 10. Find the total heat loss (BTUH) through the exterior vertical surfaces with these total building areas: a. Window area 320 SF.U b. Personnel door area 125 SF: 1 steel urethane. c. Overhead door...
On a hot summer day, 3.50 ✕ 106 J of heat transfer into a parked car...
On a hot summer day, 3.50 ✕ 106 J of heat transfer into a parked car takes place, increasing its temperature from 36.5°C to 44.4°C. What is the increase in entropy (in J/K) of the car due to this heat transfer alone? On a winter day, a certain house loses 5.80 ✕ 108 J of heat to the outside (about 550,000 Btu). What is the total change in entropy (in J/K) due to this heat transfer alone, assuming an average...
For a wall the following data given: are Outdoor Dry Bulb Temperature 92 ° F Dry...
For a wall the following data given: are Outdoor Dry Bulb Temperature 92 ° F Dry Bulb Daily Range 12 CLTD 40 LM -2 Indoor Temperature 70°F What is the Corrected Temperature Difference (CLTD)c for the wall ? 92 °F 86 °F 70 OF 47 OF 2 points QUESTION 21 Save Answe For a west facing window in Columbus,Ohio the value of maximum solar heat gain factor (SHGF) through the glass in September is: 203 227 226 209 OOOO
For...
A house has a composite wall of wood (exterior) (k = 0.12 W m-1 K -1...
A house has a composite wall of wood (exterior) (k = 0.12 W m-1 K -1 , 20 mm thick), fibreglass insulation (k = 0.045 W m-1 K -1 , 70 mm thick) and plasterboard (interior) (k = 0.25 W m-1 K -1 , 10 mm thick). Determine the total heat loss through the wall when the inside temperature is 20 °C, the outside temperature is -10 °C, the inside heat transfer coefficient is 15 W m-2 K -1, and...
Air is compressed by a 34.6 kW compressor from P1 to P2. The air temperature is...
Air is compressed by a 34.6 kW compressor from P1 to P2. The air temperature is maintained constant at 34°C during this process as a result of heat transfer to the surrounding medium at 15°C. Determine (a) the rate of entropy change of the air, (b) the rate of entropy change of the surroundings, and (c) the rate of entropy generation. State the assumptions made in solving this problem. To check your work, enter the rate of entropy generation, in...
CHP 11 A glass windowpane in a home is 0.62 cm thick and has dimensions of...
CHP 11 A glass windowpane in a home is 0.62 cm thick and has dimensions of 1.2 m × 2.2 m. On a certain day, the indoor temperature is 20°C and the outdoor temperature is 0°C. (a) What is the rate at which energy is transferred by heat through the glass? W (b) How much energy is lost through the window in one day, assuming the temperatures inside and outside remain constant? J
A closed chamber containing a gas is at steady state. The shaft transfers power at a...
A closed chamber containing a gas is at steady state. The shaft
transfers power at a rate of W˙sh,in= 2.0 kW to the paddle
wheel and the electric lamp consumes electricity at a rate of
W˙el,in= 700 W .
A) Using an energy balance determine the rate of heat transfer,
in kW.
B) If the surface temperature of the chamber is 430 K ,
determine the entropy generated within the chamber, in kW/k
C) What would the entropy generation within...
(25pts) Consider a 1.2-m-high and 2-m-wide glass window whose thickness is 6 mm and thermal conductivity...
(25pts) Consider a 1.2-m-high and 2-m-wide glass window whose thickness is 6 mm and thermal conductivity is k 0.78 W/m °C. Determine the steady rate of heat transfer through this glass window and the temperature of its inner surface for a day during which the room is maintained at 24°C while the temperature of the outdoors is-5°C. Take the convection heat transfer coefficients on the inner and outer surfaces of the window to be h 10 W/m2 °C and h...
Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm-thick layers of glass (k = 0.78 W/m K) separated by a 12-mm-wide stagnant air space (k = 0.026 W/m K). Determine the steady rate of heat transfer through this double-pane window. R . and all the surface temperatures (inner and outer of each pane) within the circuit (which you will draw and correctly label) for a day during which the room is maintained at 24°C while the temperature of...
A system executes a power cycle while receiving heat transfer at a temperature of 1000 K and discharging 1000 kJ by heat transfer at a temperature of 450 K. There are ho other heat transfers. Appling the lausus Inequality, determine entropy generation, if the thermal efficiency is 50%. Also comment if the cycle is 15. Extra-credit (10 Pts.) reversible, irreversible, or impossible? Explain your reasoning. press entropy balance using heat engine efficiency in terms of O's. Remember this is not...
For questions 9-12: outdoor temperature is-20"F and indoor temperature is 68 F.Cakculate losses for a 100 ft x 120ft x 10 ft. high rectangular building (For this problem you may ignore wall thicknesses) 9. Find the total heat loss (BTUH) through the roof assembly with R-33 10. Find the total heat loss (BTUH) through the exterior vertical surfaces with these total building areas: a. Window area 320 SF.U b. Personnel door area 125 SF: 1 steel urethane. c. Overhead door...
For a wall the following data given: are Outdoor Dry Bulb Temperature 92 ° F Dry Bulb Daily Range 12 CLTD 40 LM -2 Indoor Temperature 70°F What is the Corrected Temperature Difference (CLTD)c for the wall ? 92 °F 86 °F 70 OF 47 OF 2 points QUESTION 21 Save Answe For a west facing window in Columbus,Ohio the value of maximum solar heat gain factor (SHGF) through the glass in September is: 203 227 226 209 OOOO
For...
A closed chamber containing a gas is at steady state. The shaft
transfers power at a rate of W˙sh,in= 2.0 kW to the paddle
wheel and the electric lamp consumes electricity at a rate of
W˙el,in= 700 W .
A) Using an energy balance determine the rate of heat transfer,
in kW.
B) If the surface temperature of the chamber is 430 K ,
determine the entropy generated within the chamber, in kW/k
C) What would the entropy generation within...
(25pts) Consider a 1.2-m-high and 2-m-wide glass window whose thickness is 6 mm and thermal conductivity is k 0.78 W/m °C. Determine the steady rate of heat transfer through this glass window and the temperature of its inner surface for a day during which the room is maintained at 24°C while the temperature of the outdoors is-5°C. Take the convection heat transfer coefficients on the inner and outer surfaces of the window to be h 10 W/m2 °C and h...
Most questions answered within 3 hours.
-
An FM modulator is tested using
single-tone baseband signal with frequency of 50kHz and a sprectrum...
asked 6 minutes ago -
Write the ionic equations for the first stage of salts
hydrolysis.
Anion, Cation?
Na2S
NiSO4
K2SO4...
asked 1 hour ago -
suppose there is a normally distributed population with a mean of
250 and a standard deviation...
asked 2 hours ago -
Question Three
Suppose you as project manager are using the Waterfall
development methodology on a large...
asked 3 hours ago -
Which statement is not true about welfare in Canada?
A.Benefits typically vary based on one's ability...
asked 3 hours ago -
Please help me with FLOWCHART and UML diagram for class,
thank you!
#include <iostream>
#include <fstream>...
asked 4 hours ago -
3. Describe the “logic circuit” of the Lac operon. Which
proteins are bound or not to...
asked 4 hours ago -
Ayesha’s adjusted gross income is $60,000 in 2019. She donated a
piece of artwork with a...
asked 4 hours ago -
For Dijkstra’s shortest path algorithm:
a. Give the Big-O time for Dijkstra’s shortest path algorithm
and...
asked 4 hours ago -
Phosphorus violates the 'octet rule' in biological molecules,
forming more covalent bonds than expected based on...
asked 5 hours ago -
A 1.3 eV electron has a 10-4 probability of tunneling
through a 2.4 eV potential barrier....
asked 5 hours ago -
What is the one ingredient that is common to being successful
with all stakeholders?
profit
trust...
asked 5 hours ago