An electric cable of 10 mm in diameter is to laid in atmosphere at 20°c. the estimated surface temperature of the cable due to heat generation is 65°c. find out ther maximum percentage, increese in heat dissipated when the wire is insulated with rubber having k =0155 w/m-k. take h=8.5w/m^2.k

An external consultant recommends that a plant installs a bank of capacitors for power factor correction. this will reduce the peak electrical demand charges by an average of 93 kw every month. the plant current pays $13 per kw in peak demand charges. the capacitor bank will include 223 kw of fixed capacitors, and 183 of variable capacitors. the fixed capacitors cost $59 per kw, and the variable capacitors will cost $65 per kw. the consultant charges 21% of the equipment costs to install the capacitors. because this project will reduce the demand for the electric utility, they are prepared to provide a one-time rebate of $42 per kw of reduced demand. what is the simple payback period for this project (in years)?