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

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]

An air-conditioning system consists of a heating section and an evaporative cooler. air enters the heating section at 10°c and 70 percent relative humidity at a rate of 30m^3/min, and it leaves the evaporative cooler at 20°c and 60 percent relatively humidity. if the air conditioning system operates at a total pressure of 98 kpa, determine (a) the temperature and relative humidity of the air when it leaves the heating section, (b) the rate of heat transfer in the heating section, and (c) the rate of water added to air in the evaporative cooler

Not a characteristic property of ceramic material (a) high temperature stability (b) high mechanical strength (c) low elongation (d) low hardness