Consider a proposed offshore wind farm composed of 106 siemens direct drive wind turbines each with a rated capacity of 6.00 mw. each wind turbine has a rotor diameter of 154 meters, an effectiveness of 67.5%, and a generator efficiency of 96.0%. the array efficiency is 80.0%. it is estimated that the wind farm will generate 2500 gwh of electricity annually. each wind turbine requires 400 hours of maintenance annually. the density of air is 1.225 kg/m3.

a. what is the coefficient of performance for the turbine rotor (%)

b. what is the overall efficiency of the proposed wind farm (%)?

c. what is the capacity factor of the proposed wind farm (%)?

d. what is the swept area of the proposed wind turbines (m2)?

e. what is the rated wind speed for the proposed wind turbines (m/s)?

f. what is the availability of the proposed wind turbines (%)?

Acommercial grade cubical freezer, 4 m on a side, has a composite wall consisting of an exterior sheet of 5.0-mm thick plain carbon steel (kst= 60.5 w/m k), an intermediate layer of 100-mm thick polyurethane insulation (kins 0.02 w/m k), and an inner sheet of 5.0- mm thick aluminium alloy (kal polyurethane insulation and both metallic sheets are each characterized by a thermal contact resistance of r 2.5 x 104 m2 k/w. (a) what is the steady-state cooling load that must be maintained by the refrigerator under conditions for which the outer and inner surface temperatures are 25°c and -5°c, respectively? (b) for power saving purpose, which wall material should be increased/reduced in. thickness in order to reduce 50% of the cooling load found in part (a)? redesign the thickness of the proposed material. 177 w/m-k). adhesive interfaces between the q=575.93 w