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Consider an old house(1858) constructed of 2-in hardwood planks plus 1/2 in of lapped wood siding, sheetrock(1/2 in) covers the inside of the dwelling. The size of the house is 28ftx40ftx10ft. For simplicity, assume the roof is flat, covered with 1-in plywood plus asbestos shingles and has 3 1/2 in of fiberglass insulation. There is a wood subfloor (25/32 in) in the attic and a ahrdwood floor (3/4 in over an unheated crawl space. Assume 25% of the wall areas are single paned windows. The outside is 40oF colder than the inside.
a)Now, consider only conductive heat losses, calculate the heating needs in Btu/h
b) what will be the percent savings in heating needs of this house is insulated with a total of 6-in of fiberglass in the attic
c) What will be the percent savings in heating needs be if this house is insulated with 3 1/2 in of fiberglass in the walls (ceiling is 3 1/2 in of insulation)
d)What percentage savings is achieved by replacing single pane windows with double paned windows (1/2 in in airspace)
A 1 cm diameter, 0.4 m long steel rod is to be used in an application where it will be subjected to an axial tensile force of 15kN. The factor of safety based on yield stress must be at least 1.5, and the axial deformation must not exceed 2 cm.
What is the average length of queue, the average time spent in the system, and the average waiting time in the queue?
The development of complex algorithms that can mine mounds of data that have been collected from people and digital devices have led to the adoption of data mining by most businesses as a means of understanding their customers better than before
What would be the Horizontal and vertical component from this acting force see diagram
A CMFR is to be designed to remove contaminant A from water with a steady-state efficiency of 95 percent. The decay reaction is zeroth order, with a rate constant of 0.1M/h. The inlet concentration of A is 0.5 M.
The fixture AC is designed with a screw adjustment to regulate the height of the 900 N load supported by the roller at A. The screw bears against a smooth surface at B. Determine the reaction forces at points B and C. Neglect the weight of the fix..
How fast will it be going when it hits the ground?
A completely mixed continous bioreactor used for growing oenicilin operates at a zero orer system. The input glucose is converted into various organic yeats. the flow rate ti this system is 20 liters per minute and the conversin rate is 4 mg/(min-..
a concrete dam retaining water has a specific weight of concrete of 23.5kn/m3, what is the factor of safety against sliding & overturning and pressure intensity on the base if coefficient of friction is 0.45.
A company that manufactures regenerative thermal oxidizers made an investment 10 years ago that is now worth $1,300,000.
The belt starts from rest at time t=0 and its speed increases at a constant rate of 150mm/s^2. Knowing that the coefficient of static friction between the pacakges..
An overpass is being built over the PVI of an existing equal tangent sag curve. The sag curve has a 70 mi/h design speed, and G1 = -6%, G2 = +3%.
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