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Hydronics > Hydronics > Flashcards

Hydronics Flashcards

Test

1
Q

What are the three functions of a triple duty valve?

A

Pressure reducing, check valve, balance in valve

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2
Q

What are three devices that would be included in a makeup water system?

A

Prv, backflow preventer, isolation valve

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3
Q

What does lwco stand for?

A

Low water caught off

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4
Q

How many BTUs are required to heat one pound of water from 32° to 212° f?

A

180

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5
Q

How many BTUs are required to change 1 lb of water at 212° f to steam?

A

970

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6
Q

What valve would you choose to regulate flow through a coil?

A

Pressure reducing valve

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7
Q

What device is used to protect potable water systems from cross-contamination?

A

Backflow preventer

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8
Q

What device protects the boiler from pressure above maximum design pressure?

A

Pressure relief valve

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9
Q

What does asme boiler code require if the output of a boiler is 400,000 BTU or more?

A

Low water cutoff

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10
Q

The BTU rating of a boiler is how much heat the boiler will create and how long?

A

1 hour

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11
Q

When a heat pump is in heating mode what is the operating mode of the outdoor device?

A

Evaporator

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12
Q

In a coil what type of flow has the best heat transfer?

A

Counterflow

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13
Q

True or false. You need 10 pipe diameters of straight pipe between the y strainer and the suction for the pump.

A

False

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14
Q

When connecting the makeup water fill line, what is the best location for installation?

A

Point of no pressure change

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15
Q

When a pump is subject to a lift what must be done to the pump before you start the motor?

A

Prime it

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16
Q

Which term describes a hydronic system that is sealed to prevent entrance of air from the atmosphere?

A

Closed

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17
Q

Why is glycol not used at 100% concentration?

A

Viscosity is too high

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18
Q

Which pump is used most often for a closed hydronic piping system

A

Centrifugal

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19
Q

In a primary - secondary pumping arrangement where is the largest circulator installed?

A

Primary

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20
Q

Where would you install a triple duty valve

A

Discharge of the pump

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21
Q

What is the maximum spacing recommended for the closely space tees on a primary - secondary system?

A

Four pipe diameters

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22
Q

What are the two types of pump misalignment that must be checked?

A

Angular and parallel

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23
Q

What is the violent action of vapor bubbles in a centrifugal pump?

A

Cavitation

24
Q

What is the maximum theoretical lift of a pump?

A

34 ft of head

25
Q

If you are going to convert PSI to foot head what is the equation that you would use, and if you were going to convert foot head to psi what equation would you do.

A

Psi to ft of head = x.433

Ft of head to psi = x2.32

26
Q

Which piping system is identified by first supplied last to connect in the return?

A

Direct return

27
Q

Which system has separate heating and cooling functions with dedicated supply and return piping?

A

For pipe

28
Q

Which piping designs are two pipe systems?

A

Direct return and reverse return

29
Q

Which type of hydronic system would use gravity flow

A

Low temperature heating

30
Q

Brian or water/glycol mixture is commonly referred to as?

A

HTF

31
Q

In order to provide accurate indoor temperatures the heat supply to the building must be equal to?

A

Heat loss of the building

32
Q

What are the four types of heat transfer?

A

Conduction, convection, radiation, evaporation

33
Q

Which type of heat, when added or removed from a substance creates a change of state?

A

Latent heat

34
Q

Define humidity

A

The amount of moisture in the air

35
Q

What is dry bowl temperature?

A

Temperature of air taken with a standard thermometer

36
Q

How is rate of flow measured?

A

Gallons per minute

37
Q

Which tool is used to determine relative humidity?

A

Sling psychometer

38
Q

Which heat transfer describes the condition when a body loses heat to cooler surfaces?

A

Radiation

39
Q

Pressure, according to the height of a liquid is called?

A

Static head

40
Q

What is atmospheric pressure at sea level?

A

14.7 psia

41
Q

Temperature comfort is accomplished by controlling

A

Temperature and humidity

42
Q

Describe enthalpy

A

Total amount of energy of a substance

43
Q

What is another term for pump capacity?

A

Head pressure

44
Q

Evaporation occurs when water absorbs _____ heat

A

Latent

45
Q

What is maximum design pressure for a low temperature boiler?

A

160 PSIG

46
Q

A condenser acts as a type of?

A

Heat exchanger

47
Q

Low pressure boilers are classified by?

A

15 PSIG steam and 160 PSIG water

48
Q

Which type of device is attached to a boiler to assist in the management of air in a hydronic system?

A

Boiler fitting

49
Q

Which impeller is most efficient for pumping clear liquids?

A

Vane and pedal

50
Q

which term describes an impeller that has vanes attached to a hub that is not enclosed or supported by a shroud on either side?

A

Open impeller

51
Q

The best place for air separation is at the boiler why?

A

HTF is at a high temperature and low velocity

52
Q

A typical pressure at the top of a hydronic system with the pumps off would be?

A

4 PSIG

53
Q

Select three ways air can exist within a hydronic system?

A

Air pockets, entrained air bubbles, dissolved gases

54
Q

Which flow rate is best for air removal?

A

2 fps

55
Q

A properly installed closed loop hydronic system that has been filled and properly maintained, needs ______ additional HTF

A

Rarely

56
Q

2 types of 1 pipe systems

A

Series loop and single main

Hydronics (1 decks)

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