An air conditioner takes in outdoor air at 100c and 30% relative humidity at a steady rate of 45m3/min and conditions it to 250c and 60% relative humidity. the outdoor air is first heated to 220 c in the heating section and then humidified by the injection of hot steam in the humidifying section. assuming that the entire process takes place at a pressure of 1 atm, determine: (1) the rate of heat supply in the heating section and (2) the mass flow rate of the steam in the humidifying section.

If a particle moves along a path such that r : (3 sin t) m and ? : 2t rad, where t is in seconds. what is the particle's acceleration in m/s in 4 seconds? a)- 16.43 b)- 16.29 c)- 15.21 d)- 13.79

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.

For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 °f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater