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ITEC 271 > HVAC, Plumbing, Valves > Flashcards

HVAC, Plumbing, Valves Flashcards

(47 cards)

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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?

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A

A chemical used in a cooling mechanism

20
Q

What does an evaporator coil do?

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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?

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A

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

22
Q

What is a compressor?

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A

A pump that causes the refrigerant to flow through the system

23
Q

What are line sets?

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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?

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A

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

25
In the midwest, how deep do water lines need to run?
3 feet
26
Supply anchors need to be every how many feet?
6 feet
27
What is a stack?
The vertical drain pipe that other drain pipes feed into
28
What PSI does clean water enter a house?
50-60
29
What are some rules for a good system?
- shut off valves for every fixture and appliance - vents
30
What is a rough-in?
Where the basic lines are laid without making the final connections
31
What is pipework?
Any system of pipes or tubes
32
What are PEX (Cross Linked Polyethylene) Pipes?
- 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
What are PVC (Polyvinyl Chloride) Pipes?
- 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
What are Rigid Copper Pipes?
- 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
What are ABS (Acrylonitrile Butadiene Styrene) Pipes?
- mainly used as a vent and drain line - looks like PVC but is black and slightly softer
36
What are Flexible Copper Pipes?
- 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
What are Galvanized Steel Pipes?
- still around but only used for gas supply - was used for decades for drainage, water supply and gas supply
38
What are Cast Iron Pipes?
- 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
What is corrosion?
The deterioration of metal on nonmetal surfaces
40
What is are Braided Stainless Steel Flexes?
- 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
What is a valve in plumbing?
A type of fitting that allows regulation, control, and direction of fluids passing through a pipe
42
What are valves commonly used for?
Direct flow, shut off water access, prevent back-flow, and adjust water pressure within a system
43
What is a ball valve?
- 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
What is a butterfly valve?
- 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
What is a check valve?
- ensure that water is only permitted to flow in one direction - are for back-flow prevention
46
What is a needle valve?
- 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
What are some different types of cooling systems?
- Central Air Conditioners and Heat Pumps - Room Air Conditioners - Evaporative Coolers - Ductless Mini-Split Air Conditioners

ITEC 271 (4 decks)

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