Building Utilities 2: Midterms Reviewer part 2

Question 1

Systems that remove heat from buildings

Answer 1

COOLING SYSTEMS

Question 2

_ ___ _ ______ warm air is carried away from rooms to an air-
conditioning unit (ACU)

Answer 2

To cool a building

Question 3

removes dust and other impurities

Answer 3

Air filter

Question 4

contains a refrigerant that absorbs heat from the air passing around it

Answer 4

Cooling coil

Question 5

pulls the warm air from the room & Pushes cooled air back to the rooms

Answer 5

Blower

Question 6

Size of ACU or air-conditioning equipment –

Answer 6

rated in BTUs

Question 7

Air cooling systems are designed to control:

Answer 7

Temperature and Humidity

Question 8

Cooling Units that share blowers, ducts and outlets with heating systems

Answer 8

COMBINED HEATING AND COOLING SYSTEMS

Question 9

Work like a reversible refrigeration system; Can both cool and heat buildings

Answer 9

HEAT PUMPS

Question 10

________– a heat pump removes heat from indoor air through a closed refrigerant cycle

Answer 10

In warm weather

Question 11

________-heat is drawn from the outside air, water or ground and transferred inside

Answer 11

In cold weather

Question 12

Effective in warm or mild climates; Do not heat efficiently when temperatures are below 30°F (-1°C)

Answer 12

Air-source heat pumps

Question 13

These are water-source heat pumps; Extract heat from the earth; More effective for heating in cooler climates

Answer 13

Ground-source (geothermal)

Question 14

Two types of Ground-source (geothermal)

Answer 14

Open-loop system
Closed-loop system

Question 15

Heat pump systems consists of:

Answer 15

▪ Inside air handler
▪ Outside heat pump
▪ Ducts
▪ Outlets

Question 16

It pumps heat from the various rooms into a heat sink

Answer 16

Refrigeration machine

Question 17

source of heat can usually be the outdoor air, but can be a body of water or the ground

Answer 17

Heat sink

Question 18

What to use in small buildings,

Answer 18

condenser coil

Question 19

What to use in medium buildings,

Answer 19

evaporator condenser

Question 20

What to use in large buildings,

Answer 20

cooling towers

Question 21

Air is blown across the cold evaporator coil and delivered by ducts to the rooms that require cooling; Effectively ventilate, filtrate and dehumidify air

Answer 21

All-Air Systems

Question 22

Water is chilled by the evaporator coil and then delivered to fan-coil units in each space

Answer 22

All-Water Systems

Question 23

▪ Bulk of cooling is handles by the water and fan-coil units
▪ Small air system completes the cooling
▪ Ventilates, dehumidifies and filter the air
▪ Most of the cooling is accomplished by the water systems
▪ Air ducts can be quite small

Answer 23

Combination Air-Water Systems

Question 24

It is necessary to keep fresh air circulating

Answer 24

Ventilation

Question 25

State when moisture is controlled and keeps air relatively dry

Answer 25

Effective ventilation

Question 26

circulate air in attics, crawl spaces and bathrooms

Answer 26

Ceiling and exhaust fans

Question 27

Part of the house that remove excessive moist air

Answer 27

Crawl space ventilation

Question 28

Part of the house that provide space for adequate circulation

Answer 28

High ceilings

Question 29

VOCs

Answer 29

volatile organic compounds

Question 30

filters filled with fiberglass or charcoal – remove 15% of all pollutants

Answer 30

Mechanical filters

Question 31

filters with ionizing wires – trap 99%

Answer 31

Electrostatic filters

Question 32

– introduce low levels of ozone (electronically charged oxygen) into the air supply

Answer 32

Ozonators

Question 33

Thermostatic controls keep buildings at a constant temperature

Answer 33

TEMPERATURE CONTROL

Question 34

sensing devices, located on interior walls away from sources of heat or cold such as fireplaces or windows

Answer 34

Thermostats

Question 35

is moisture in the air

Answer 35

Humidity

Question 36

sensing devices that monitor humidity levels

Answer 36

Humidistats

Question 38

Involves using the sun’s energy by integrating the systems with the basic design of structure; Operate without the use of mechanical or electronic devices to heat or cool a structure

Answer 38

PASSIVE SOLAR SYSTEMS

Question 40

any material that will absorb heat from the sun and later radiate the heat back into the air

Answer 40

Thermal mass

Question 41

Heated air will always rise by convection until trapped ▪ Heating – re-circulate heated air from high places to cooler lower areas ▪ Cooling – expel high level warm air

Answer 41

Rising Warm Air

Question 42

▪ Ceiling heights ● Low – trap warm air in the living space ● High – allow warm air to rise

Answer 42

Remember

Question 43

Passive Solar Methods:

Answer 43

Direct-Gain Method and Indirect-Gain Method

Question 44

the inside of the building is heated by the sun’s rays directly as they pass through large glass areas or structural materials

Answer 44

Direct-Gain Method

Question 45

– uses a thermal mass placed between the sun and the inside of a building

Answer 45

Indirect-Gain Method

Question 46

✔ Use mechanical devices to drive the components needed for solar heating or cooling ✔ Operate more effectively when combined with passive solar features

Answer 46

ACTIVE SOLAR SYSTEMS

Question 47

needed for cloudy periods

Answer 47

Backup Power

Question 48

These should be set at an angle perpendicular to the rays of the sun for maximum collection per day or use rotating collectors

Answer 48

Heat collectors

Question 49

ASHRAE

Answer 49

American Society of Heating, Refrigerating and Air-Conditioning Engineers

Question 50

INDUSTRY STANDARDS

Answer 50

(ASHRAE, 2020)

Question 51

Residential ventilation standards

Answer 51

– to make houses healthier for the occupants

Question 52

- exhausting pollutants from a point close to the source (bath and kitchen fans)

Answer 52

Local ventilation