Chapter Nine Flashcards
Heating, Ventilating, and Air-Conditioning for Human Comfort
To determine the latent heat present in the air in the mechanical closet, Grayson needs to know the difference between DB temperature and:
WB (wet bulb) Temperature
Helen considers human heat loss or gain as a critical factor in choosing an HVAC system. She knows that if the MRT in an office is ______ the temperature of the occupants skin and clothing, the surfaces surrounding each occupant radiate heat toward the person.
a. the same as
b. higher than
c. lower than
d. within range of
B. Higher than
Phil is designing an air-conditioning system for a soda bottling plant. He should tailor the system to meet the load required to serve line workers regularly participating in which of the following activities?
a. seated, very light work
b. moderately active office work
c. light machine work
d. athletics
c. Light machine work
Renee has noticed a problem with excessive humidity in some of the older buildings she manages, but she recalls that the RH does not adversely affect comfort as long as it is between _____ percent and 60 percent
30%
Mark just moved to a new city where he is the facilities manager for a Class A office building. He remembers ASHRAE’s standard that for inactive, lightly clothed individuals and stillair conditions, optimum comfort can be maintained in the interior of an office building with maximums of ________ in the summer.
76 degrees @ 50% RH
Sarah relies on ______ of her building’s HVAC system to compensate for the different heating and cooling needs of the different areas in the building and reduce operating expenses.
Zoning
Although there are several types of internal heat loads in his building, Dan recognizes that _____ are the most significant internal heat source.
a. people
b. lights
c. computers
d. electric motors in the HVAC system
b. lights
Gary does his best to mitigate external heat loads. He uses shading devices to reduce ________loads.
solar
Ruby monitors the effectiveness of the building’s HVAC system in adequately distributing ventilation air, controlling airborne contaminants, and maintaining an acceptable temperature and humidity level. Each of these contributes to good:
IAQ (Indoor Air Quality)
Allison suspects that the occupants of Eighth Street Offices may have_____ because several individuals on the ground floor have fallen ill with similar respiratory problems, but no specific illness has bee identified.
SBS
