Homework Answers
Add Answer to:
1. The PEM fuel cell shown in figure can be used in as a renewable energy...
Wayne Industries has developed a revolutionary computer processor which dissipates 0.25 Watts of thermal energy through...
Wayne Industries has developed a revolutionary computer processor which dissipates 0.25 Watts of thermal energy through a heat sink by convection and radiation (black body) into the surroundings (20 oC). You are tasked with determining the steady-state surface temperature of the heat sink if the convective heat transfer coefficient is 5 ? /?2.? , and the heat sink has an effective area of 0.001 m2 ?
n#2 The use of available materials can challenge ba shown in basic wall designs. For the...
n#2 The use of available materials can challenge ba shown in basic wall designs. For the composite wall ine the temperature on the inside surface and the cross-section, determine the temperature on the inside nitos are -5°C can challenge oad for every 1 meter of wall length. The outside extreme ,0 wm2-K. The e conditions are and the forced convection heat transfer coefficient is estimated at n heat transfer inside conditions are to be maintained at 20°C and the natura...
1: A horizontal, opaque flat surface at a steady-state temperature of 77C is exposed to an...
1: A horizontal, opaque flat surface at a steady-state temperature of 77C is exposed to an airflow having a freestream temperature of 27C with a velocity of 15 m/s, and a length of 1 m along the flow direction. The emissive power of the surface is 628 W/m2 , the irradiation from surroundingsis 1380 W/m2 , and the reflectivity is ?=0.40. (a) Determine the absorptivity (?) of the surface. Ans: 0.6 (b) Determine the net radiation heat transfer rate for...
hair dryer may be idealized as a circular duct through which a small fan draws ambient...
hair dryer may be idealized as a circular duct through which a
small fan draws ambient air and within which the air is heated as
it flows over a coiled electric resistance wire.
(1) If a dryer is designed to operate with an electric power
consumption of Pelec= 1500 W and to heat air from an ambient
temperature of Ti= 20°C to a discharge temperature of To= 45°C, at
what volumetric flow rate ∀˙ should the fan operate? Heat loss...
1. Consider an opaque, horizontal square plate (Im by 1m) with an electrical heater on its backside. The front side is exposed to ambient quiescent air that is at 20° C, solar irradiation (from...
1. Consider an opaque, horizontal square plate (Im by 1m) with an electrical heater on its backside. The front side is exposed to ambient quiescent air that is at 20° C, solar irradiation (from sun at 5800° K) of 600 W/m2, and an effective sky temperature of -40° C. The plate surface temperature is kept at Ts 60 C (at steady state condition). Calculate natural convection heat transfer coefficient from the plate. (10 points) What is the electrical power (W/m2)...
please show me how I can finds the answers of these two examples Example 1: Design of a Solar Heater (Black bodies: no convection) A square flat plate collector is exposed to solar radiation from...
please show me how I can finds the answers of these two
examples
Example 1: Design of a Solar Heater (Black bodies: no convection) A square flat plate collector is exposed to solar radiation from both the sides. The exposed surface of the plate has an absorptivity of 1.0 for solar radiation. On a clear summer day on the earth's surface the solar radiation flux is approximately 1140 W/m2 and the surrounding air temperature is 25oC. Determine the surface temperature?...
UESTION 1: Energy balance (50 points) Humans are able to control their heat production rate their...
UESTION 1: Energy balance (50 points) Humans are able to control their heat production rate their heal production rate and heat loss rate to maintain a nearly constant Core temperature of T-37°C under a wide range of environmental conditi under a wide range of environmental conditions. This process is called on th e heut transfer between a human body and its between hum summ e focus on a layer in the eur am m ature 308 Considera per with a...
Problem 1. (25%) The temperature on the inside surface of a CYLINDRICAL tank is T.(11) =...
Problem 1. (25%) The temperature on the inside surface of a CYLINDRICAL tank is T.(11) = 100°C under steady state conditions. The temperature outside the tank, T2(2), needs to be determined. The inner radius is 1 m and the outer radius is 1.3 m, and the tank material has a conductivity of k = 15 W/m. K. ONLY CONVECTION on the outer surface has to be considered. The ambient temperature is To = 25°C and the convection heat transfer coefficient...
Quantitative: In the 1950s liquid hydrogen was considered as a fuel for a new type of...
Quantitative: In the 1950s liquid hydrogen was considered as a fuel for a new type of aircraft being developed, the SR-71 Blackbird (shown in Figure 1). Figure 1: The SR-71 Blackbird Early research on the project focused on which fuel to use for the Blackbird. Pratt & Whitney had a J-57 engine that was designed for kerosene and being considered for implementation on the Blackbird. The J-57 only took 5 months to convert to running on liquid hydrogen, however tests...
B2 The University has decided to commission a large iconic sculpture which is to be erected in place of the old library. The structure is intended to acknowledge the industrial heritage of the region...
B2 The University has decided to commission a large iconic sculpture which is to be erected in place of the old library. The structure is intended to acknowledge the industrial heritage of the region whilst at the same time linking to the University's motto "Per Ardua Ad Alta" (through efforts to high things"). An (unimaginative) artist is suggesting that a large circular chimney (diameter D, height h) should be built using the bricks from the old library. Concern has been...
n#2 The use of available materials can challenge ba shown in basic wall designs. For the composite wall ine the temperature on the inside surface and the cross-section, determine the temperature on the inside nitos are -5°C can challenge oad for every 1 meter of wall length. The outside extreme ,0 wm2-K. The e conditions are and the forced convection heat transfer coefficient is estimated at n heat transfer inside conditions are to be maintained at 20°C and the natura...
hair dryer may be idealized as a circular duct through which a
small fan draws ambient air and within which the air is heated as
it flows over a coiled electric resistance wire.
(1) If a dryer is designed to operate with an electric power
consumption of Pelec= 1500 W and to heat air from an ambient
temperature of Ti= 20°C to a discharge temperature of To= 45°C, at
what volumetric flow rate ∀˙ should the fan operate? Heat loss...
1. Consider an opaque, horizontal square plate (Im by 1m) with an electrical heater on its backside. The front side is exposed to ambient quiescent air that is at 20° C, solar irradiation (from sun at 5800° K) of 600 W/m2, and an effective sky temperature of -40° C. The plate surface temperature is kept at Ts 60 C (at steady state condition). Calculate natural convection heat transfer coefficient from the plate. (10 points) What is the electrical power (W/m2)...
please show me how I can finds the answers of these two
examples
Example 1: Design of a Solar Heater (Black bodies: no convection) A square flat plate collector is exposed to solar radiation from both the sides. The exposed surface of the plate has an absorptivity of 1.0 for solar radiation. On a clear summer day on the earth's surface the solar radiation flux is approximately 1140 W/m2 and the surrounding air temperature is 25oC. Determine the surface temperature?...
UESTION 1: Energy balance (50 points) Humans are able to control their heat production rate their heal production rate and heat loss rate to maintain a nearly constant Core temperature of T-37°C under a wide range of environmental conditi under a wide range of environmental conditions. This process is called on th e heut transfer between a human body and its between hum summ e focus on a layer in the eur am m ature 308 Considera per with a...
Problem 1. (25%) The temperature on the inside surface of a CYLINDRICAL tank is T.(11) = 100°C under steady state conditions. The temperature outside the tank, T2(2), needs to be determined. The inner radius is 1 m and the outer radius is 1.3 m, and the tank material has a conductivity of k = 15 W/m. K. ONLY CONVECTION on the outer surface has to be considered. The ambient temperature is To = 25°C and the convection heat transfer coefficient...
Quantitative: In the 1950s liquid hydrogen was considered as a fuel for a new type of aircraft being developed, the SR-71 Blackbird (shown in Figure 1). Figure 1: The SR-71 Blackbird Early research on the project focused on which fuel to use for the Blackbird. Pratt & Whitney had a J-57 engine that was designed for kerosene and being considered for implementation on the Blackbird. The J-57 only took 5 months to convert to running on liquid hydrogen, however tests...
B2 The University has decided to commission a large iconic sculpture which is to be erected in place of the old library. The structure is intended to acknowledge the industrial heritage of the region whilst at the same time linking to the University's motto "Per Ardua Ad Alta" (through efforts to high things"). An (unimaginative) artist is suggesting that a large circular chimney (diameter D, height h) should be built using the bricks from the old library. Concern has been...
Most questions answered within 3 hours.
-
A college student is employed as a door-to-door newspaper
salesman. Historical data suggests that the student...
asked 38 minutes ago -
MATLAB HW 11 problem using Switch Case and Input commands
Write a script file that calculates...
asked 23 minutes ago -
Considering gravitational time dilation, calculate the time that
passes in Earth’s surface while 1 hour passes...
asked 1 hour ago -
Minitab Problem: Take the Lake Hume June rainfall data and find
use the processes outlined in...
asked 1 hour ago -
X Company is trying to decide whether to continue using old
equipment to make Product A...
asked 1 hour ago -
IN PYTHON ONLY !! Program 2: Re-work
program #5 (WeeklyHours) from the previous assignment such that...
asked 2 hours ago -
The average length of time between arrivals at a turnpike
toll-booth is 26 seconds. What is...
asked 4 hours ago -
(a) A piston at 6.1 atm contains a gas that occupies a volume of
3.5 L....
asked 5 hours ago -
Please answer true or false. Words
cannot be changed or added in to make it true...
asked 5 hours ago -
An empty test tube weighs 15.923 grams. Then,
MgCl2•6H2O is added into the test tube. After...
asked 5 hours ago -
Assume memory access is 10 units of time and disk access is
10000 units of time....
asked 5 hours ago -
1. Are all good samples random?
2. Magazines often report surveys giving statistics such as “63%...
asked 6 hours ago