Engineering, 09.09.2019 20:30 zsmart909
Double pane windows are often used to reduce heat loss in buildings. to illustrate this, consider the following problem. two 6 mm thick panes of glass are separated by a stagnant insulating argon gas. the panes are separated by 12mm, and the internal surfaces of the glass are at 25°c and 10°c. the thermal conductivities of glass and argon are 1.4 w/(m*k) and 0.017 w/(m*k), respectively. a) what is the rate of heat loss from a 1m x 0.5m window? b) what would the rate of heat loss be if only one pane of glass were used in this situation? assume that the temperatures on the external surfaces of the glass pane are 25°c and 10°c. c) why is the result in part a) so different from that in part b)?
Answers: 2
Engineering, 03.07.2019 14:10
Amass of 1.5 kg of air at 120 kpa and 24°c is contained in a gas-tight, frictionless piston-cylinder device. the air is now compressed to a final pressure of 720 kpa. during the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. calculate the boundary work input during this process.
Answers: 2
Engineering, 04.07.2019 18:10
Different types of steels contain different elements that alter the characteristics of the steel. for each of the following elements, explain what the element does when alloyed with steel.
Answers: 2
Engineering, 04.07.2019 18:10
Carbon dioxide gas expands isotherm a turbine from 1 mpa, 500 k at 200 kpa. assuming the ideal gas model and neglecting the kinetic and potential energies, determine the change in entropy, heat transfer and work for each kilogram of co2.
Answers: 2
Engineering, 04.07.2019 18:10
Which from the following instrument is commonly used to detect the high pitch butzing sound in bearings? [clo4] a)-digital ultrasonic meter b)-infrared camera c)-spectroscopic d)-vibrometer
Answers: 2
Double pane windows are often used to reduce heat loss in buildings. to illustrate this, consider th...
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