How much water is required to raise the relative humidity of air from 25 to 95 p

Question

How much water is required to raise the relative humidity of air from 25 to 95 percent if the temperature is held constant at 95 degree F? Water flows in a pipe of 23-cm diameter with an average velocity of 0.73 m/s, the diameter of the pipe is reduced, and the average velocity of the water increases to 1.66 m/s. What is the diameter of the smaller pipe? What is the flow rate? A water is flowing at 385 gpm through a 4.3-in radius horizontal pipe. If the bore of the pipe is reduced to 2.7-in radius and the pressure in the smaller pipe is 93 psig, what is the pressure in the larger section of the pipe? An Instrumentation student bought a new thermometer. He wanted to validate the sensor before using it for his Instrumentation and Control system lab work. He used three points calibration process. He measured a water temperature using his new sensor at freezing point (0 degree C), at boiling point (100 degree C) and at midpoint (50 degree C). The readings of his thermometer at these three points were -1, 49 and 96 degree C, respectively. a. What is the regression equation of this Calabrian process? b. Produce a table showing the calibrated (correct) temperatures for the readings measured by this thermometer as 35, 25, 44, 26, and 53 degree C.

Explanation / Answer

Answer to part 2: The amount of water vapor in the air at any given time is usually less than that required to saturate the air. The relative humidity is the percent of saturation humidity, generally calculated in relation to saturated vapor density.

Relative humidity =( actual vapor density / saturation vapor density ) x 100%

In the question, given that relative humidity of air is to be raised from 25 to 95 percent.

therefore required difference in relative humidity = 70%

The density of a substance is the relationship between the mass of the substance and how much space it takes up (volume).

Density equals the mass of the substance divided by its volume; D = m/v.

Now lets calcuate the density of water vapor required to raise the humidity by 70%

relative humidity = 70% = (actual vapor density / saturated vapor density ) x 100

so required vapor density = 70 x 100 / 100 = 70 g / m3

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