The evaporator of a refrigeration cycle is basically a heat exchanger in which a refrigerant is evaporated by absorbing heat from a fluid. refrigerant-22 enters an evaporator at 200 kpa with a quality of 22 percent and a flow rate of 2.65 l/h. r-22 leaves the evaporator at the same pressure superheated by 5 o c. the refrigerant is evaporated by absorbing heat from air whose flow rate is 0.75 kg/s. make a sketch of this heat exchanger labeling the inlets and exits for both the refrigerant and the air. then determine (a) the rate of heat absorbed from the air [kw] and (b) the temperature change of air [ o c]. the properties of r-22 at the inlet and exit of the condenser are h1 = 220.2 kj/kg, v1 = 0.0253 m3 /kg, and h2 = 398.0 kj/kg

Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

Afull journal bearing has a journal diameter of 27 mm, with a unilateral tolerance of -0.028 mm. the bushing bore has a diameter of 27.028 mm and a unilateral tolerance of 0.04 mm. the l/d ratio is 0.5. the load is 1.3 kn and the journal runs at 1200 rev/min. if the average viscosity is 50 mpa-s, find the minimum film thickness, the power loss, and the side flow for the minimum clearance assembly.