Air enters a dehumidifier/air-conditioning system with a mass flow rate of 60 kg dry air/min. the entering air is at 26°c, 50% relative humidity. saturated air and condensate leave the cooling section at 4°c. the air is then heated to a final temperature of 20°c in the heating section. determine: a.) the rate heat is removed in the cooling section, kj/min and tons b.) the rate water is condensed in the cooling section c.) the rate of heat transfer to the air in the heater section, kw d.) the relative humidity of the air exiting the system

When at a point two solid phase changes to one solid phase on cooling then it is known as a) eutectoid point b) eutectic point c) peritectic point d) peritectoid point

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.

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