Engineering, 25.11.2019 21:31 vava19
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) = 42
relative humidity: phi1 (%) = 75%
mass flow rate of air: ma1 (lba/h) = 1792
dry bulb: t2 (f) = 86
a) determine the specific volume of the air (ft^3/lba) at state 1. 12.727
b) determine the dew point temperature (f) for state 1 34.65
c) determine the wet bulb temperature (f) for state 1. 38.72
d) determine the humidity ratio at state 1. 00420351
e) determine the specific enthalpy (btu/lb) at state 1. 14.618
f) determine the specific enthalpy (btu/lb) at state 2.
g) determine the electric power (kw) required for the heater.
h) determine the electric current (amps) through the heater if the supply voltage is 220 v
Answers: 2
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