Hydronic System Balancing and Building Commissioning

1
Chapter 8

• Hydronic System Balancing and Building
  Commissioning

Testing, Adjusting, and Balancing of Chilled and
Hot Water Hydronic Systems Commissioning of
Commercial Buildings HVAC Systems
2
Chapter 8

• Hydronic System Balancing and Building
  Commissioning

Testing, Adjusting, and Balancing of Chilled and
Hot Water Hydronic Systems Commissioning of
Commercial Buildings HVAC Systems
3

• Circulation pump testing is required when a new
  system is installed.

4

• Variable-frequency drives need to be tested and
  adjusted to fit the correct operating
  requirements.

5

• Electronic tachometers measure the speed of a
  moving object.

6

• The speed of a rotating shaft can be measured by
  an electronic tachometer.

7

• Digital multimeters record measurements of
  electrical properties.

8

• Digital multimeters are relatively easy to use to
  measure the line voltage of an variable-frequency
  drive.

9

• Clamp-on ammeters measure current in a circuit.

10

• The procedure for using clamp-on ammeters to
  measure current involves several steps.

11

• Hydronic manometers measure water pressure to
  help balance a hydronic system.

12

• Hydronic manometer procedures are used to check
  pump performance and verify terminal flow.

13

• Mechanical gauges measure pressure and are
  available in a variety of ranges.

14

• Flow-balancing valves often have a manual valve
  with an indicator to show how much the valve is
  open.

15

• The flow rate through balancing valves can be
  determined using charts and graphs.

16

• If the gallons per minute of flow and the
  temperature differential of the water in a coil
  are known, the amount of British thermal units
  removed can be determined.

17

• The water flow rate through a valve can be
  determined if the flow coefficient and pressure
  drop are known.

18

• While building commissioning can be expensive,
  often the cost is less than 1 of the total
  construction costs.