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Consider a building whose annual air-conditioning load is estimated to be 120,000 kWh in an area where the unit cost of electricity is $.10/kWh. Two air conditioners are considered for the building.
Air conditioner "A" has a seasonal average COP of 3.2 and cost $5500.00 to purchase and install.
Air Conditioner "B" has a seasonal average COP of 5.0 and cost $7000.00 to purchase and install.
All else being equal, determine which air conditioner is a better buy.
a gasoline engine delivers 150 kw . the fuel used in c8h18 liq and it enters the engine at 25 c . 150 of theoretical
In many cases, we are concerned with free convection involving gases that are contained within sealed enclo- sures. Consider air at 27°C and pressures of 1, 10, and 100 bars. Determine the gure of meritdescribed in Problem 9.4 for each of these thr..
you are asked to design a heating system for a swimming pool that is 2 m deep 25 m long and 25 m wide. your client
design a symmetric 4-bar mechanism optimized for a constant velocity of 150 insec over a straight line motion of 8 such
a 20-kg uniform cylindrical roller initially at rest is acted upon by a 90-n force as shown. knowing that the body
Decide one by one the exact location of the points that appear in the two dimensional plot of fig 2.8. How many different paths can the system follow from state a to state b (chapter 2, advanced engineering thermodynamics by began)
A piston cylinder device initially contains 0.15-kg steam at 3.5 MPa, superheated by 5 C. Now the steam loses heat to the surroundings and the piston moves down, hitting a set of stops at which point the cylinder contains saturated liquid water. the ..
Three lb of water is contained in a piston–cylinder assembly, initially occupying a volume V1 5 30 ft3 at T1 5 300°F. The water undergoes two processes in series: Sketch the two processes in series on a T–y diagram. Neglecting kinetic and potential e..
a small air turbine with an isentropic efficiency of 80 should produce 270 kjkgof work. the inlet temperature is 1000 k
It is assumed that a boundary layer begins to develop about 12 km from shore. If the wind speed averages 18 m=s, estimate the thickness of the boundary layer and the shear stress on the surface of the water near the shore.
a 12-in radius cylinder of weight 16lb rests on a 6lb carriage. the system is at rest when a force p of magnitude 4lb
The stresses at a point in plane stress on a sheet metal roof were found to be sigma_xx = 10 ksi (C), sigma_yy = 20 ksi (C) and Tau_xy = 30 ksi using matrix methods a) determine the normal and shear stresses on a plane passing through the point that ..
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