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Calculate the heat-removal factor for a collector having an overall heat loss coefficient of 6 W/m2 K and constructed of aluminum fins and tubes. Tube-to-tube centered distance is 15 cm, fin thickness is 0.05 cm, tube diameter is 1.2 cm, and fluid tube heat-transfer coefficient is 1200 W/m2 K. The cover transmittance to solar radiation is 0.9 and is independent of direction. The solar absorptance of the absorber plate is 0.9, the collector is 1 m wide and 3 m long, and the water flow rate is 0.02 kg/s. The water temperature is 330 K.
The tires that fail in a period are replaced in the same period. The company is currently considering two options. First, to determine the optimal replacement age (period) of all tires or second, replace tires as they fail.
What is the current factor of safety against a quick condition at A‘? (The FS is defined as the ratio of the critical gradient to the existing gradient).
How to convert kilo pascal to psi ?measure units How to convert 52 kilo pascal to psi ?measure units
draw and dimension the bar diagram for a 3 38 in. shaft with a class 3 fit. draw and dimension a typical hole and shaft
Define the decision variables and write out an optimization problem. Give the complete formulation explicitly stating objective function, all constraints and parameter values. Use Excel program to solve the formulated optimization problem. Show ev..
The 25-kg bar has a centre of mass at G.If it is supported by a smooth peg at C,a roller at A and cord AB, determine the reactions at these supports.
Estimate the smallest diameter rod on which Kevlar 49 ?ber of 12-µm-diameter ?bers can be wound without kinking. The tensile strength is 2.8 GPa, Young's modulus is 125 GPa, Poisson's ratio is 1/3, and the tensile strain to fracture is 2.3%.
A supply of steam at a pressure of 4 MPa and a temperature of 332°C (state 1) is used to do mechanical work as it expands to a pressure of 100 kPa and a quality of 90% (state 2). During the expansion process, 60 kJ/kg of heat is removed from the wate..
a spring-loaded a toy gun is used to shoot 1 -oz bullets vertically upward. the undeformed length of the spring is 6
A piston-cylinder assembly contains a two-phase liquid-vapor mixture of H2O at 200 lbf/in^2 with a quality of 80%. The mixture is heated and expands at constant pressure until a final temperature of 480 F is reached. Determine the work for the proces..
a 2 m3 tank containing nitrogen at 25oc and 500kpa is connected through a valve to another tank containing 3kg of
a carnot heat pump refrigerator operates between -7 and 29 . it has an input power of 3.5kw. determine a the
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