Lab #3 - Pre-lab(1)
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Kwantlen Polytechnic University *
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Course
2400
Subject
Aerospace Engineering
Date
Apr 3, 2024
Type
Pages
3
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1 Name: Lab section: Pre-Lab Assignment #3 Humidity, Adiabatic Processes, and Isobar Maps Part A: Psychrometric Readings 1)
Complete Table 3-1 using the psychrometric charts for relative humidity and dewpoint temperature (Tables 3-1 and 3-2), located in the Introduction
of this assignment. Table 3-1. Psychrometric Readings. Dry-Bulb Temp. (°C) Wet-Bulb Temp. (°C) Wet-Bulb Depression (°C) Relative Humidity (%) Dew Point Temp. (°C) 10 4.0 0.00 -2.0 -2.0 -6.0 Recall from the introduction that the wet-bulb depression is the dry-bulb temperature (T) minus the wet-
bulb temperature (T
w
). . Wet-bulb depression = T
(dry-bulb)
–
T
(wet-bulb) Record the wb depressions in Table 3-1. Now you’re ready to use the psychrometric charts Tables 3
-1 and 3-2 (located in Lab #3 Introduction
) to look up the RH and dewpoint temperatures. The wet-bulb depression
is displayed horizontally along the top
of the psychrometric charts. The dry-bulb temperature
is displayed vertically along the left
side of the chart. The intersection of where thes
e meet will be the valve you’re looking for. Search YouTube for '
Christopher Rafalik - Calculating RH using Sling Psychrometer'
for guidance on using psychrometric charts.
2 Part B: Adiabatic Processes 2a.) What is the change in elevation (difference in elev.) between the summit of a mountain at 3420m and the Lifting Condensation Level (LCL) at 1500m? Show all work. b.) If an air parcel is cooling at a rate of 6.0°C/1000m how much would it cool by between the LCL and the summit? The summit is at 2900m and the LCL is at 1200m. Show all work and canceling of units. Provide answer to 1dp. Use the following formula: Temperature change = change in elevation x rate of cooling/warming 3.) Draw a diagram
of a mountain below and include the following. Keep your drawing tidy and organized. View
Adiabatic Video #2 prior to drawing. Read
and print
the ′
Adiabatic Terminology
′
handout so you know what the terms below mean. label the windward and leeward sides of the mountain. draw an arrow on each side of the mountain –
an arrow pointing up for rising air and an arrow pointing down for descending air. Indicate beside each if the air is cooling or warming. label the base of the mountain, the LCL and the maximum height the air rises (the LCL will be part-
way up the mountain; no heights provided) Label the dewpoint (no temp. provided). label where the air becomes saturated and where the RH is 100%. indicate on the diagram where the air parcel cools/warms at the DALR (unsaturated) and the MALR (saturated). label the cloud layer –
indicate where it starts and ends.
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