Superheated steam flows through steel pipes in the utility tunnel network below the sidewalks on our campus. In the winter, the cold air in these tunnels is warmed by the steam flowing through the pipes. The largest pipe is 0.4 m in diameter, carrying high energy steam across campus. This steam is leaves the powerplant at 1 MPa, 600 oC at a velocity of 10 m/s. By the time it reaches the other side of campus, the steam pressure and temperature drops to half those values (0.5 MPa and 300 oC). This energy loss is due almost entirely to heat exchange with the cold air in the tunnels; estimate how much energy could be saved each winter day (24 hr period) by insulating the pipe ?

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)?

Arigid tank contains 10 kg of air at 137 kpa (abs) and 21°c. more air is added to the tank until the pressure and temperature rise to 242 kpa (abs) and 32°c, respectively. determine the amount of air added to the tank. [r-0.287 kj/kg k]

In a unit cell of fcc structure, indicate the position of one of the tetrahedral interstitial sites by plotting the corresponding tetrahedron. do the same for one of the octahedral interstitial sites (in a separate fcc unit cell). mark the positions of all the tetrahedral and octahedral interstitial sites in the unit cells. how many equivalent tetrahedral sites and how many equivalent octahedral sites are contained in a fcc unit cell, respectively. what is the coordination number for a tetrahedral site and what is the coordination number for an octahedral site?