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ITEC 271 > HVAC, Plumbing, Valves > Flashcards

HVAC, Plumbing, Valves Flashcards

1
Q

What is HVAC?

A

Heating, Ventilation and Air Conditioning

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2
Q

Purpose of HVAC?

A

Control temperature within space, control of moisture, filtration of air borne particles, movement of air, supply fresh air from outside

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3
Q

What is heating?

A

To increase the temperature by adding thermal energy

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4
Q

What is cooling?

A

To decrease the temperature by removing the thermal energy

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5
Q

What is humidifying?

A

The process of increasing the relative humidity by addition of water vapor or steam

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6
Q

What is dehumidifying?

A

The process of removing the water vapor or humidity

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7
Q

What is cleaning?

A

The process of removing dust, pollens, smoke, and contaminants

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8
Q

What is ventilating?

A

The process of adding external air to freshen up the air and maintaining gas ratio

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9
Q

What is air movement?

A

To control the movement of supplied air so that the inhabitants of the space do not feel discomfort

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10
Q

What is sensible heat?

A

Describes how hot something feels (Degrees C, F, K)

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11
Q

What is latent heat?

A

The quantity of heat energy in a substance

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12
Q

What does BTU stand for?

A

British Thermal Units

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13
Q

What is a thermostat?

A

Brain of the system, senses heat/cold, keeps system at desired temperature, displays current temperature

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14
Q

What does a blower motor do?

A

Circulates air in the system

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15
Q

What are ducts?

A

Pathways for heated or cooled air to travel

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16
Q

What is supply air?

A

Vents that supply heated or cool air to a room

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17
Q

What is return air?

A

Takes air from a room and returns it back to the heating/cooling system

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18
Q

What is a heat exchanger?

A

A device that transfers heat between two or more fluids

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19
Q

What is refrigerant?

A

A chemical used in a cooling mechanism

20
Q

What does an evaporator coil do?

A

Allow compressed cooling chemicals to evaporate from liquid to gas while absorbing latent heat in the process

21
Q

What does a condenser do?

A

Turns the chemicals from a gas to a liquid by cooling it (removing latent heat)

22
Q

What is a compressor?

A

A pump that causes the refrigerant to flow through the system

23
Q

What are line sets?

A

Two semi-flexible copper pipes to connect the outdoor air conditioner or heat pump to the indoor evaporator coil

24
Q

What is plumbing?

A

The system of pipes, tanks, fittings, and other apparatus required for the water supply, heating, and sanitation in a building

25
Q

In the midwest, how deep do water lines need to run?

A

3 feet

26
Q

Supply anchors need to be every how many feet?

A

6 feet

27
Q

What is a stack?

A

The vertical drain pipe that other drain pipes feed into

28
Q

What PSI does clean water enter a house?

A

50-60

29
Q

What are some rules for a good system?

A
  • shut off valves for every fixture and appliance
  • vents
30
Q

What is a rough-in?

A

Where the basic lines are laid without making the final connections

31
Q

What is pipework?

A

Any system of pipes or tubes

32
Q

What are PEX (Cross Linked Polyethylene) Pipes?

A
  • one of the newest and most popular pipes to the plumbing market
  • is rigid enough to withstand pressures of water supply but flexible enough to weave throughout the walls, ceilings, basements and crawlspaces
33
Q

What are PVC (Polyvinyl Chloride) Pipes?

A
  • a drain or vent line type of plumbing pipe
  • lighter and easier to work with than galvanized steel pipe
  • glues together with solvents
  • easy to install but requires more than a hacksaw and a miter box to cut
34
Q

What are Rigid Copper Pipes?

A
  • often used for water supply lines within the home
  • easily cut with hacksaw or with a special copper tube cutter
  • it requires a practiced hand to solder copper pipe together
  • great for water supply because it does not come with any health risks
35
Q

What are ABS (Acrylonitrile Butadiene Styrene) Pipes?

A
  • mainly used as a vent and drain line
  • looks like PVC but is black and slightly softer
36
Q

What are Flexible Copper Pipes?

A
  • used for final runs to water heaters, refrigerators, and some sinks
  • only used for short runs and can be cut with a hacksaw
  • bent to fit around corners
37
Q

What are Galvanized Steel Pipes?

A
  • still around but only used for gas supply
  • was used for decades for drainage, water supply and gas supply
38
Q

What are Cast Iron Pipes?

A
  • was often used used for sewer and other drainage purposes
  • found in many homes today
  • viable until the point it rusts completely through
  • very heavy and difficult to cut
39
Q

What is corrosion?

A

The deterioration of metal on nonmetal surfaces

40
Q

What is are Braided Stainless Steel Flexes?

A
  • used for hooking up a faucet or other fixtures to water supply
  • has multiple options of fitting to choose from
  • around 125 PSI maximum pressure rating
  • constructed with durable braided stainless steel outer sheathing with tough nylon reinforced vinyl tubing inside
41
Q

What is a valve in plumbing?

A

A type of fitting that allows regulation, control, and direction of fluids passing through a pipe

42
Q

What are valves commonly used for?

A

Direct flow, shut off water access, prevent back-flow, and adjust water pressure within a system

43
Q

What is a ball valve?

A
  • control water flow by using a rotational ball located in the center of the valve
  • turning handle 1/4 is enough to seal off the flow of fluid
  • most commonly used as shut off valve
44
Q

What is a butterfly valve?

A
  • also used as shut-off valve
  • to isolate and regulate flow
  • constant exposure to rushing water will erode the disc element and weaken the watertight seal
  • controlled by a 1/4 turn of a handle
45
Q

What is a check valve?

A
  • ensure that water is only permitted to flow in one direction
  • are for back-flow prevention
46
Q

What is a needle valve?

A
  • allow for precise control of water flow by the raising and lowering of a threaded, conical spindle
  • used for isolation, regulation, and throttle of liquids and gases
  • offer flow control with precision
  • capable of withstanding very high pressures
  • ideal for applications where fluid needs to be shut-off gradually, or a very low flow rate is desired
  • tip seals perfectly within a valve seat at the very bottom
47
Q

What are some different types of cooling systems?

A
  • Central Air Conditioners and Heat Pumps
  • Room Air Conditioners
  • Evaporative Coolers
  • Ductless Mini-Split Air Conditioners

ITEC 271 (4 decks)

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