Info

CL/VS

Schedule but still VS

One time load measurement (either pre- or post-retrofit) and sufficient measurement of runtime

Sufficient measurement of runtime

CL/VS

Load but still CL and schedule to TS

One time load measurement and sufficient measurement of runtime

One time load measurement

CL/VS

Load to VL and schedule but still TS

One time load measurement and sufficient measurement of runtime

Sufficient load measurements to characterize load

CL/VS

Load but still CL and schedule to VS

One time load measurement and sufficient measurement of runtime

One time load measurement and sufficient measurement of runtime

CL/VS

Load to VL and schedule but still VS

One time load measurement and sufficient measurement of runtime

Sufficient load measurements to characterize load

VL/TS or VS

Load to CL

Sufficient load measurements to characterize load

One time load measurement and sufficient measurement of runtime

VL/TS or VS

Load but still VL

Sufficient load measurements to characterize load

Sufficient load measurements to characterize load

VL/TS or VS

Schedule still or to TS

Sufficient load measurements to characterize load

Sufficient load measurements to characterize load

VL/TS or VS

Schedule to or still VS

Sufficient load measurements to characterize load

Sufficient load measurements to characterize load

VL/TS or VS

Load to CL and schedule still or to TS

Sufficient load measurements to characterize load

One time load measurement

VL/TS or VS

Load but still VL and schedule still or to TS

Sufficient load measurements to characterize load

Sufficient load measurements to characterize toad

VL/TS or VS

Load to CL and schedule to or still VS

Sufficient load measurements to characterize load

One time load measurement and sufficient measurement of runtime

VL/TS or VS

Load but still VL and schedule to or still VS

Sufficient load measurements to characterize load

Sufficient load measurements to characterize load

CL = constant load

TS = timed (known) schedule

VL = variable load

VS = variable (unknown) schedule

CL = constant load

TS = timed (known) schedule

VL = variable load

VS = variable (unknown) schedule

A. Pumps

Most large HVAC systems utilize electric pumps for moving heating/cooling water from the building's primary systems (i.e., boiler or chiller) to the building's secondary systems (i.e., air-handling units, radiators, etc.) where it can condition the building's interior. Such pumping systems use different types of pumps, varying control strategies, and piping layouts. Therefore, the characterization of pumping electric power depends on the system design and control method used. Pumping systems can be characterized by the three categories shown in Table 27.6.80 Table 27.7 shows the six pump testing methods, including the required measurements, applications and procedures steps.

ASHRAE's Research Project 827-RP81 developed six in-situ methods for measuring the performance of pumps of varying types and controls. To select a method the user needs to determine the pump system type and control, and the desired level of uncertainty, cost, and degree of intrusion. The user also needs to record

Table 27.6: Applicability of Test Methods to Common Pumping Systems from the ASHRAE Guideline 14-2002.82
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