Awell-insulated box loses heat to the ambient only through a single-pane glass window of area 1 m2 and thickness 0.5 em. the ambient medium is at 10°c, and the external heat transfer coefficient is 10 w/m2 • k. the interior of the box is maintained at 25°c and is well mixed, giving the window an inside surface temperature of 2soc. at $0.15/kw ·h (kilowatt-hour), what is the annual cost of maintaining this system

Derive the correction factor formula for conical nozzle i=-(1+ cosa) and calculate the nozzle angle correction factor for a nozzle whose divergence hal-fangle is 13 (hint: assume that all the mass flow originates at the apex of the cone.

Air is compressed isentropically from an initial state of 300 k and 101 kpa to a final temperature of 1000 k. determine the final pressure using the following approaches: (a) approximate analysis (using properties at the average temperature) (b) exact analysis

An open feedwater heater operates at steady state with liquid entering at inlet 1 with t? = 40°c and pl = 1 .2 mpa. water vapor att2-200°c and p2 = 1.2 mpa enters at inlet 2. saturated liquid water exits with a pressure of pa 1.2 mpa. neglect heat transfer with the surroundings and all kinetic and potential energy effects, determine the mass flow rate of steam at inlet 2 if the mass flow rate of liquid water at inlet 1 is given as 2 kg/s.