Flashcards in Boiler, Low Temperature Hot Water Piping And Trim Deck (23)
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0
What best describes the amount of heat energy required to raise the temperature of a pound of water through 1*f
Btu- British Thermal Unit
1
Which boiler is limited to a maximum working pressure of 30psig (Water) or 15 psig (Steam)
High Mass cast iron
2
Within a hot water boiler, which device indicates pressure and temperature ?
Combination gauge
3
The device used to shutdown the fuel to the burner when the water level in the boiler drops below its operating level is called a/an?
Float operated low water cut off or a/an probe type water cut off
4
A globe valve pattern device that is used t reduce incoming water pressure to the minimum desired boiler system pressure and that also serves as an automatic water feeder is know as a:
Pressure reducing valve/ PRV
5
What are the maximum operating temperatures and pressures of a low temperature high mass cast iron hot water boiler
120*c (250*f),207kPa (30psig)
6
What is the maximum operating temperature and pressure of a low-temperature low-mass copper or steel tube hot water boiler
120*c (250*f), 1100kPa (160psig)
7
Low-temperature low-pressure hot water boilers are usually rated in?
Net Btu/hr or EDR
8
The amount of heat energy available at the heat transfer units is defined as:
The net rating
9
A hot water EDR has a Btu value of:
150 Btu/hr
10
The amount of heat energy consumed by the boiler is defined as:
The input rating
11
The purpose of a balancing valve is to:
Adjust flow rates to each heat transfer unit
12
The purpose of a wild-loop is to:
Prevent the pump from deadheading
13
The type of radiator valve that should be installed to prevent unauthorized use is a:
Lock shield radiator valve
14
The purpose of a zone valve is to:
Provide control of heating emission
15
The part of a circulator that transfers energy to the water is:
The impeller
16
What is the function of a circulator in a hot water heating system?
Moves the water within the system
17
The 2 variables you will find on a pump curve are?
Head and flow
18
The best place for the circulator in a hot water heating system is:
Downstream of the compression tank
19
Finned tubed baseboard is rated by what method?
Btu per foot hour based upon supply water temperature, flow rate and entrance air temperature of 65*f
20
How do you control the heat output of finned tube baseboard?
By adjusting the damper
21
What is the length of fin that would be required for a room with a heat loss of 8000 Btu/hr if the f'in had an output rating of 45Btu/ft/hr
18'
22
