8. a wood chip fueled rankine cycle 54-mw electric power generation plant uses chipped pine bark beatle deadfall as fuel. the overall efficiency of the power plant is 27% and the capacity factor of 80%. the as-received wood fuel is 45% carbon, has a higher heating value of 16.0 mj/kg, and the wood is not harvested sustainably. carbon emissions are taxed at the rate of $25/mgco2e. the life of the system is 25 years and the interest rate is 5.5%. assume an operations and maintenance cost of $0.025/kwh. the initial cost of the system is $4000/kw. the cost of wood chips is $6 per mbtu. a. what is the heat rate of the power plant (btu/kwh)? b. what is the cost of fuel per kwh of electricity generated ($/kwh)? c. how much electrical energy is generated annually by the power plant (mwh/y)?

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