Hydronics

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Author:
TWilson88
ID:
275842
Filename:
Hydronics
Updated:
2014-06-01 17:03:23
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Hydronics
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Questions that will be on the test
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  1. In what three ways does the human body lose its heat
    Radiation, Convection, Evaporation
  2. What are four advantages of heating domestic hot water with a hot water heating boiler
    • 1.Continuous use prevents deterioration in boiler
    • 2.Energy efficiency
    • 3.Production of ample hot water
    • 4.Helps keep basement dry
  3. List two of the options available for summer cooling in conjunction with hydronic heating
    • 1. Water chiller and fan coil unit which distributes cool air
    • 2. Combination heating and cooling units which circulate hot water in the winter and cool water in the summer
  4. A compression tank is not necessary in a system if a pressure reducing valve is used

    True or False
    False
  5. Plug a relief valve if it continues to drip

    True or False
    False
  6. What creates circulation in a gravity hot water heating system?
    When water heated in the boiler increases in volume and rises simultaneously with a downward movement of the cooler heavier water in the return main
  7. What creates circulation in a forced hot water heating circulation system?
    Booster Pump
  8. What are two advantages of using a higher temperature heating system?
    1. Smaller sized radiation units and small pipe sizes can be used
  9. List the three types of hydronic heating systems described
    A series loop system, one-pipe system, two-pipe system
  10. Water temperatures in a closed hydronic heating system do not affect the sizes of radiation and piping

    True or False
    False
  11. The Btuh output of a boiler can be increased by raising the boiler water temperature

    True or False
    False
  12. The Btuh carrying capacity of a pipe decreases as the velocity of water in that pipe increases

    True or False
    False
  13. What is pressure drop?
    The amount of pressure lost between any two points in a system
  14. What causes pressure drop?
    The friction created between the inner walls of pipe and fittings and the liquid flowing through them
  15. How is pressure drop expressed?
    Pounds per square inch, feet of water, or milinches
  16. What is a milinch?
    1/12,000 of a foot or 1/1,000 of an inch
  17. What is head pressure and how is it usually expressed?
    The maximum pressure drop in which the pump can induce a flow, expressed in feet of water
  18. What is static pressure?
    Weight of water in the system, equal to .433 psig per foot of height above the gauge
  19. What is meant by Type RC baseboard?
    Extended convection heating surface, and heat is supplied by both radiation and convection
  20. List four advantages of using baseboard radiation
    • 1. Inconspicuous
    • 2. Clean in operation
    • 3. Minimum of interference with furniture placement
    • 4. Distributes heat near the floor
  21. What are two factors in addition to size and design on which the capacity of radiation units depend?
    Temperature drop of water and temperature of the water being circulated
  22. What is the preferred location for convectors?
    They are located, as much as possible, on outside walls and under windows
  23. Why is the length of piping important in a hydronic heating system?
    to be able to size the pump and the pipe
  24. What purpose does the piping layout serve?
    it shows the location of the boiler and location of room units
  25. What are four items which must be included in the measurement of the circuits in a hydronic heating system?
    Vertical supply from the top of the boiler. Each time the main goes up through the floor to the baseboard or goes down through the floor to the basement, 18 inches must be added to the length of the circuit, there is a vertical drop of 6 feet from the end of the return to the boiler connection and all other piping which can be measured.
  26. Why must the number of gallons per minute of the system must be considered when figuring resistance?
    To determine the size of the pump and piping
  27. In hydronic heating systems how much of the system must be considered when figuring resistance?
    Total equivalent length of the longest circuit
  28. How does the determination of total equivalent length differ between the single-main and two pipe systems?
    In the single-main system the TEL may be determined by finding the measurement of the longest circuit excluding run-outs and risers, in a two pipe system the total resistance is the sum of the circuit piping resistance plus the convector resistance including run-outs and risers

    • (The supply stays the same in a two pipe system but stays the same size in a single main)
    • (The return gets larger in a two pipe system)
  29. List two reasons why the location chosen for separating air from water is at the boiler?
    • 1. The temperature is highest
    • 2. The velocity is lowest

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