Consider a Carnot-cycle heat pump with R - 134a as the working fluid. Heat is absorbed into the R - 134a at 0 degree C, during which process it changes from a two-phase state to saturated vapor. The heat is rejected from the R - 134a at 60 degree C and ends up as saturated liquid. Find the pressure after compression, before the heat rejection process, and determine the COP for the cycle. Note that this is a refrigeration cycle run in the counterclockwise direction

The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false

The drive force for diffusion is 7 fick's first law can be used to solve the non-steady state diffusion. a)-true b)-false

Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.