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1. In a department store, which should be the more comfortable summer condition: 80 F DB and 40% RH or 78 F DB and 70% RH? Explain.
2. The conditions in an office are 70 F DB and 40% RH. Would the occupants be comfortable in winter? Would they be comfortable in sum-mer? Explain.
3. The conditions in an office in summer are 75 F DB and 50% RH. Should the conditions remain as they are or should they be changed? Explain. What changes should be made, if any? Explain.
4. The conditions in an office in winter are 77 F DB and 10% RH. Are these conditions acceptable? Explain. What changes should be made, if any? Explain.
a 2-kg block of ice with an initial temperature of -20f is dropped into an insulated tank containing 10-kg of liquid
Determine the Biot number in order to support the lumped formulation. Solve the differential equation to find an expression for temperature as a function of time.
Compute the volume of cutting, given that the width at formation level is 8 m and the side slopes 1.1/2 to 1. The centre depths of the cutting at 30 m intervals may be determined by subtracting the formation from the respective ground levels.
What is the shortcut equations used for evaluating the heat added to air by a steam coil. Use a sketch to present information on both the air side and steam side of this heat exchanger.
two slender rods of negligible weight are pin-connected at a and attached to the 18-lb block b and the 80-lb block c as
Also draw at least two views of Rag foundation bolt. Take D=20mm
A closed, rigid tank is filled with a gas modeled as an idea gas, initially at 27 degrees C and a gage pressure of 300 kPa. The gas is heated, and the gage pressure at the final state is 367 kPa. Determine the final temperature, in C. The local atmos..
1. An inventor claims to have developed a food freezer that at steady state requires a power input of 0.6 kW to extract energy by heat transfer at a rate of 3000 J/s from freezer contents at 270 K. Evaluate this claim for an ambient temperature of..
an earthen channel n0.03 has a bed width of 5.0 m a water depth h 1.5 m a 45deg side slope and a channel slope of
2kg of an ideal gas for which Cp=0.895 KJ/kg-k and Cv =0.706 KJ/kg-k is contained in a rigid, insulated container at 2 bar, 400K. A stirrer driven by an external motor is operated within the vessel until the pressure becomes 4bar. Determine, the fina..
a 4 ft concrete post is reinforced with four steel bars each with a 34 diameter. knowing that es 29 x 106 psi and ec
three kg of air contained in a sealed deformable device at 150 deg c and 500 kpa is expanded to 150 kpa in an
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