HELLO I ONLY NEED HELP ON QUESTION 7 AND 8. THE ANSWERS ARE GIVEN BELOW THE QUES

Question

HELLO I ONLY NEED HELP ON QUESTION 7 AND 8. THE ANSWERS ARE GIVEN BELOW THE QUESTION I JUST CANT SEEM TO GET THE ANSWER. THANK YOU

Supply air for a building is heated from State 1 to State 2 by an electric heater. Given the conditions below determine the following. Given Values Dry Bulb: T1 (F) = 52 Relative Humidity: Phil (%) = 60% Mass flow rate of air: mal (lba/h) = 1500 Dry Bulb: T2 (F) = 95 Determine the specific volume of the air (ft^3/lba) at State 1 Your Answer = Answer = 13.00 +/- 0.03 Determine the dew point temperature (F) for State 1. Your Answer = Answer = 38.6 +/-0.7 Determine the wet bulb temperature (F) for State 1. Your Answer = Answer = 45.4 +/- 0.7 Determine the humidity ratio at State 1. Your Answer = Answer = 0.0049 +/- 0.0004 Determine the specific enthalpy (Btu/lb) at State 1. Your Answer = Answer = 17.80 +/-0.4 Determine the specific enthalpy (Btu/lb) at State 2. Your Answer = Answer = 28.21 +/-0.4 Determine the electric power (kW) required for the heater. Your Answer = Answer = 4.58 +/-0.1 Determine the electric current (amps) through the heater if the su

Explanation / Answer

7. h2-h1 =10.41 btu/lb

= 24.21 kg/s

and mass flow rate = 1500 lb/h = 0.1889 kg/s

power = 24.21 * 0.1889 = 4.5739 kW

8)

current = power / volatage = 4573.9/220 = 20.79 A

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