Steam enters a heat exchanger operating at steady state at 0.07 mpa with a specific enthalpy of 2431.6 kj/kg and exits at the same pressure as saturated liquid. the steam mass flow rate is 1.5 kg/min. a separate stream of air with a mass flow rate of 100 kg/min enters at 30 degrees celsius and exits at 60 degrees celsius. the ideal gas model with cp = 1.005 kj/kg. k can be assumed for air. kinetic and potential energy effects are negligible. determine a) the quality of the entering steam and b) the rate of heat transfer between the heat exchanger and its surroundings, in kw. hint: (b) use the relationship between the change in enthalpy and the change in the temperature for an ideal gas.

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.

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

What precautions should you take to prevent injuries when dealing with heavy loads?