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RS 530 Study Guide - Winter 2019, Comprehensive Final Exam Notes - Solar Irradiance, Solar Gain, Thermal Mass


Department
Regenerative Studies
Course Code
RS 530
Professor
Pablo La Roche
Study Guide
Final

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RS 530

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Psychometrics and Thermal Comfort
1. Psychometrics
a. Psychometry is the field of study that deals with the theory and technique of
psychological measurements
b. Dry bulb temperature indicates the amount of heat in the air
c. Humidity ratio indicates the amount of moisture by weight of air
d. Vapor pressure is linearly related to absolute humidity
e. Relative humidity expresses the relationship between the amount of water vapor
in the air compared to the maximum that it can hold
i. Expressed as a percentage
2. Specific and relative humidity
a. Relative humidity = π‘Žπ‘šπ‘œπ‘’π‘›π‘‘ π‘œπ‘“ π‘šπ‘œπ‘–π‘ π‘‘π‘’π‘Ÿπ‘’ π‘π‘’π‘Ÿ 𝑙𝑏 π‘œπ‘“ π‘‘π‘Ÿπ‘¦ π‘Žπ‘–π‘Ÿ π‘ π‘Žπ‘šπ‘π‘™π‘’
π‘Žπ‘šπ‘œπ‘’π‘›π‘‘ π‘œπ‘“ π‘šπ‘œπ‘–π‘ π‘‘π‘’π‘Ÿπ‘’ π‘π‘’π‘Ÿ 𝑙𝑏 π‘œπ‘“ π‘‘π‘Ÿπ‘¦ π‘Žπ‘–π‘Ÿ π‘Žπ‘‘ π‘ π‘Žπ‘‘π‘’π‘Ÿπ‘Žπ‘‘π‘–π‘œπ‘› x 100
3. Enthalpy
a. Enthalpy is the heat content of the air relative to 0 C and 0 relative humidity
i. It is the sum of the latent heat and sensible heat
b. Sensible heat increases the temperature of the air
c. Latent heat is that is necessary to evaporate liquid water to form the moisture
content of the air
d. Wet bulb temperature measures the cooling effect of evaporation
i. The drier the air the larger the difference between the wet bulb
temperature and the dry bulb temperature
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e. When water evaporates within a stream of ambient air without supply of external
heat, the temperature of the air is lowered and its moisture content is elevated
while its wet bulb temperature remains constant
f. Such a change in air temperature without addition or extraction of heat from the
system is called β€œadiabatic” meaning that the total energy of the air is kept
constant
4. Thermal comfort
a. Comfort occurs when the body temperature is held within a specific narrow range,
skin moisture is low and physiological effort of regulation is minimized
b. The sensation of comfort depends a great deal on the ease which the body is able
to regulate the balance
i. M Β± Rd Β± Cv Β± Cd – Ev = βˆ† S
ii. M= metabolic heat production, Rd= net radiation exchange, Cv=
convection (including respiration), Cd= conduction, Ev= evaporation
(including respiration), βˆ† S= change in stored heat
c. Environmental factors
i. Air temperature- measured by dry bulb temperature and affects convective
heat dissipation
ii. Radiation- affects radiant exchange of the body with the surrounding
surfaces
iii. Air motion- affects the evaporation of moisture from the skin
iv. Relative humidity- affects evaporation rate
d. Personal value
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