A wet-bulb thermometer consists of a mercury-in-glass thermometer covered with a wetted (water) fabric. When suspended in a stream of air, the steady-state thermometer reading indicates the wet-bulb temperature T wb . Obtain an expression for determining the relative humidity of the air from knowledge of the air temperature ( T ∞ ) , the wet-bulb temperature, and appropriate air and water vapor properties. If T ∞ = 45 ° C and T w b = 25 ° C, what is the relative humidity of the airstream?
A wet-bulb thermometer consists of a mercury-in-glass thermometer covered with a wetted (water) fabric. When suspended in a stream of air, the steady-state thermometer reading indicates the wet-bulb temperature T wb . Obtain an expression for determining the relative humidity of the air from knowledge of the air temperature ( T ∞ ) , the wet-bulb temperature, and appropriate air and water vapor properties. If T ∞ = 45 ° C and T w b = 25 ° C, what is the relative humidity of the airstream?
A wet-bulb thermometer consists of a mercury-in-glass thermometer covered with a wetted (water) fabric. When suspended in a stream of air, the steady-state thermometer reading indicates the wet-bulb temperature
T
wb
.
Obtain an expression for determining the relative humidity of the air from knowledge of the air temperature
(
T
∞
)
,
the wet-bulb temperature, and appropriate air and water vapor properties. If
T
∞
=
45
°
C
and
T
w
b
=
25
°
C,
what is the relative humidity of the airstream?
Define the range of permissible values for the barometric pressure, relative humidity, and temperature in your environment.
The gauge pressure of a car tire is measured as 125 kPa before a trip, and 189 kPa after the trip, at a location where the atmospheric pressure is 95 kPa. Assuming that the volume of the tire remains constant and the air temperature before the trip is 101.3 ° C, determine the temperature of the air in the tire after the trip.
A summer air conditioning system, consisting of a cooling coil and a reheat coil, supplies air to a space maintained at 25°C db-temperature and 20°C wb-temperature. The sensible and latent heat loads on the space are 15 kW and 10 kW respectively. The conditions of the air leaving the cooling coil are 13°C db-temperature and 90% relative humidity. The pressure is constant at 101.3 kPa. Determine:The db-temperature of the supply air in °C.The dry-air mass flow rate of the air supplied in kg/s.The rate of heat input by the reheat coil in kW.The bypass factor of the cooling coil in %.
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