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A large warehouse building is heated during the winter to maintain interior temperatures at 18 C. On a certain day the outdoor temperature is constant at 5 C. The total roof area is 5000 m2. The wall area excluding windows and doors, is 3000 m2. The area of windows and doors is 250 m2. Ignore convection and radiation heat transfer mechanisms for parts a, b and c.
a) Compute the rate of heat transfer through the roof if it has an R-value of 3.1 m2-C/W.
b) Compute the rate of heat transfer through the walls (excluding windows and doors) if the walls have an effective thermal conductivity of 0.035 W/m-C and a thickness of 12 cm.
c) Compute the rate of heat transfer through the doors and windows assuming they have a total thermal resistance, R, of 0.00087 C/W.
d) The building is heated by a hot air furnace which is rated by the number of BTU/hour it can deliver. How many BTU/hour are needed to heat the building under the conditions indicated.
Cork is used for sealing sparkling wine bottles. Aside from friction, why not use rubberbto seal wine bottles. (Hint: think about the force exerted by the pressure inside and how does that deform each material) Be sure to use poissons ratio in the..
Structural Analysis 8th edition 4-40 draw the shear and moment diagrams for each member of the frame. Assume A is a rocker, and D is pinned.
If a truck has a capacity of 24m^3 (Heaped) and 18m^3 (struck), with a total empty weight of 31600kg (truck), and needs to move soil at a density of 1850kg.m^3 (Bank) with a swell of 41%
A soil, 150mm x 150mm x 20mm high, is subjected to simple shear deformation. The normal force in the Z direction is 1 kN and the shear force is 0.5 kN. The displacements at the top of the soil in the X and Y directions are delta x = 1mm and delta z =..
A piece of wire is stretched from length l1 to length l2 (step A), and then from length l2 to length l3 (step B). (i) Write down an expression for the engineering strain associated with step A.
If the air-conditioning costs of a house are $500 a year, determine how much the trees will save the home owner in the 20-year life of the system.
A fixed-bed carbon adsorption system consisting of two 3-foot-deep beds containing 6 x 16 mesh carbon operates at a superficial gas velocity of 60 ft/min
Estimate the theoretical fracture strength of a brittle material ifit is known that fracture occurs by the propagation of anelliptically shaped surface crack of length
Enlist the engineering benefits of using concrete for structures.
This Table gives the standard penetration numbers determined from a sandy soil deposit in the field. Depth (m) 3.0, 4.5, 6.0, 7.5, 9.0, 10.5, 12. Unit weight of soil Kn/M^3
A sample of soil was compacted into a 945 ml.laboratory mold. The mass of the compacted soil was 1850 grams and its moisture content was 13.1%. Specific gravity of solids is 2.70, Compute the moist unit weight, dry unit weight, and degree of satu..
Prepare a sketch of the plan view of the slab indicating the possible location of the piers. You can assume the piers are 300mm in diameter
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