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Design a thermoelectric refrigerator that is capable of cooling a canned drink in a car. The refrigerator is to be powered by the cigarette lighter of the car. Draw a sketch of your design. Semiconductor components for building thermoelectric power generators or refrigerators are available from several manufacturers. Using data from one of these manufacturers, determine how many of these components you need in your design, and estimate the coefficient of performance of your system. A critical problem in the design of thermoelectric refrigerators is the effective rejection of waste heat. Discuss how you can enhance the rate of heat rejection without using any devices with moving parts such as a fan.
A 50 meter wide rectangular channel is carrying a flow of 250 m3/s at a flow depth of 5 meters. To produce critical flow in this channel, determine
Find max pressure at bottom of gate (psi) 2. Total horizontal force on gate 3. moment about the bottom of the gate
A spherical gas container made of steel has a 5-m outer diameter and a wall thickness of 6 mm. Knowing the internal pressure is 350 kPa, determine te maximum normal stress and the maximum shearing stress in the container.
A coast guard helicopter hovers between an island and a damaged sailboat. How would you calculate the direct distance between the helicopter and the sailboat? From the island, the angle of elevation to the helicopter is 73 degrees. From the helicopte..
In trigonometric leveling from point A to point B, the slope distance and the zenith angle measured in A were 2504.897 m and 85o08’54”. At B, these measurements were 2504.891 m and 94o52’10” respectively
If the man is always seated in an upright position, determine the magitudes of the horizontal and vertical reactions of the chair on the man at the instant \theta = 45^\circ. At this instant he has a speed of 6 {\rm m/s}
Corporate Decision Making
For a given tank circuit resonance frequency, what is the parameter that determines the bandwidth
The velocity distribution for the flow of oil (SAE 20W) at 150 degrees between two plates is given by y(y-4) mm/s, where y is measured in mm and the space between the plates is 4mm. Determine the shear stress at each wall and the maximum shear str..
(a) determine if the flow will choke and both the downstream and upstream water depths. (b) if there is also a 1 ft high step up in bottom elevation at the contraction, determine if the flow will choke and both the downstream and upstream water de..
The concrete cylinder 6 in x 12 in broke incompression at a load of 110000 lbs. Compute the crushing strength of concrete. Estimate the tensile strength and the modulus ofelasticity.
Water at 20 °C is transported through a 200 m long wrought iron pipe with a head loss of 9.8 m. Determine the diameter of the pipe required to convey 10L/sec.
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