Water initially a saturated liquid at 150oCis contained in a piston–cylinder assembly. The water isheated to the corresponding saturated vapor state in an internally reversible process at constant temperatureand pressure. For T0=20oC, p0=1 bar, and ignoring the effects of motion andgravity, determineper unit of mass, each in kJ/kg, (a) the change in exergy, (b) the exergy transfer accompanying heat transfer,(c) the exergy transfer accompanying work, and (d) the exergy destruction

Line joining liquid phase with liquid and solid phase mixture is known as: a) liquidus b) solidus c) tie line d) none of the mentioned

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

Different types of steels contain different elements that alter the characteristics of the steel. for each of the following elements, explain what the element does when alloyed with steel.