ASHRAE Journal - June 2013 - 25
Efficiency
change when connected to a
100%
VFD compared to a simple
line connection, which may
be partially attributed to the
90%
previously described harmonics that VFDs can generate. Harmonics can increase
DOE
motor losses, reduce torque,
80%
Manufacturer A
cause overheating, and proManufacturer B, 480 V, Series 1
duce torque pulsation. ManManufacturer B, 480 V, Series 2
ufacturer G, which did not
Manufacturer B, 240 V, Series 1
70%
have part-load efficiency data,
Manufacturer B, 240 V, Series 2
noted that an increase in VFD
Manufacturer C, 480 V
efficiency may decrease moManufacturer C, 240 V
tor efficiency, but other manu60%
facturers did not mention this
Full-Flow: 14,000 cfm at 15.2 in. w.c.
potential effect. As a result, to
Fan Shaft: 3,810 rpm; 62 ft·lbf; VFD Output: 50 hp
use the 1210 test results during system design, one needs
50%
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
to know whether the intended
Fraction of Full-Load Flow
combination of VFD and motor matches the 1210 test con- Figure 5: VFD efficiency for models rated 50 hp (37 kW) versus fraction of full-load flow.
figuration.
The publishing of Standard 1210 is a crucial step in completing space and plotted as a function of the flow rate of the fan system
a database of VFD performance characteristics and a better under- to better understand how part-load performance varies with fan
standing of how combined VFD and motor efficiency affects fan operation. With these new modeling techniques and standardized
system operation. When manufacturers produce efficiency data data, designers and end users will be able to better understand
according to this standard and complete and consistent data in building energy performance and use this information to help size
the form of a three-dimensional performance map are available, equipment, which will improve building energy efficiency.
methods should be developed to separate out the VFD and motor
efficiencies and, the drives analyzed in this project should be re- References
1. 2012 ASHRAE Handbook—HVAC Systems and Equipment,
evaluated to verify whether Equation 1 still holds, or this equation
Chapter 19, p.19.2.
should be reformulated to represent VFD and motor packages.
2. Henninger, R.H. (ed). 1975. “NECAP—NASA’s Energy-Cost
Furthermore, the database should be plotted in dimensionless Analysis Program, Part II – Engineering Manual.” National Aero-
www.info.hotims.com/44633-45
June 2013
ASHRAE Journal
25
ASHRAE Journal - June 2013
Table of Contents for the Digital Edition of ASHRAE Journal - June 2013
ASHRAE Journal - June 2013
Contents
Commentary
Industry News
Letters
Meetings and Shows
Feature Articles
Standardizing Data for VFD Efficiency
Technical vs. Process Commissioning
Technology Award Case Studies:
Low EUI Community Hospital
Reheat for Medical Center
Standing Columns
Building Sciences
Data Centers
Emerging Technologies
Engineer's Notebook
IAQ Applications
Special Products
Refrigeration Applications
Energy Modeling
People
Products
Classified Advertising
Advertisers Index
ASHRAE Journal - June 2013 - ASHRAE Journal - June 2013
ASHRAE Journal - June 2013 - Cover2
ASHRAE Journal - June 2013 - 1
ASHRAE Journal - June 2013 - 2
ASHRAE Journal - June 2013 - Contents
ASHRAE Journal - June 2013 - Commentary
ASHRAE Journal - June 2013 - 5
ASHRAE Journal - June 2013 - Industry News
ASHRAE Journal - June 2013 - 7
ASHRAE Journal - June 2013 - 8
ASHRAE Journal - June 2013 - 9
ASHRAE Journal - June 2013 - Letters
ASHRAE Journal - June 2013 - 11
ASHRAE Journal - June 2013 - Meetings and Shows
ASHRAE Journal - June 2013 - 13
ASHRAE Journal - June 2013 - 14
ASHRAE Journal - June 2013 - 15
ASHRAE Journal - June 2013 - Standardizing Data for VFD Efficiency
ASHRAE Journal - June 2013 - 17
ASHRAE Journal - June 2013 - 18
ASHRAE Journal - June 2013 - 19
ASHRAE Journal - June 2013 - 20
ASHRAE Journal - June 2013 - 21
ASHRAE Journal - June 2013 - 22
ASHRAE Journal - June 2013 - 23
ASHRAE Journal - June 2013 - 24
ASHRAE Journal - June 2013 - 25
ASHRAE Journal - June 2013 - 26
ASHRAE Journal - June 2013 - 27
ASHRAE Journal - June 2013 - Technical vs. Process Commissioning
ASHRAE Journal - June 2013 - 29
ASHRAE Journal - June 2013 - 30
ASHRAE Journal - June 2013 - 31
ASHRAE Journal - June 2013 - 32
ASHRAE Journal - June 2013 - 33
ASHRAE Journal - June 2013 - 34
ASHRAE Journal - June 2013 - 35
ASHRAE Journal - June 2013 - Low EUI Community Hospital
ASHRAE Journal - June 2013 - 37
ASHRAE Journal - June 2013 - 38
ASHRAE Journal - June 2013 - 39
ASHRAE Journal - June 2013 - 40
ASHRAE Journal - June 2013 - 41
ASHRAE Journal - June 2013 - 42
ASHRAE Journal - June 2013 - 43
ASHRAE Journal - June 2013 - 44
ASHRAE Journal - June 2013 - 45
ASHRAE Journal - June 2013 - Reheat for Medical Center
ASHRAE Journal - June 2013 - 47
ASHRAE Journal - June 2013 - 48
ASHRAE Journal - June 2013 - 49
ASHRAE Journal - June 2013 - 50
ASHRAE Journal - June 2013 - 51
ASHRAE Journal - June 2013 - Building Sciences
ASHRAE Journal - June 2013 - 53
ASHRAE Journal - June 2013 - 54
ASHRAE Journal - June 2013 - 55
ASHRAE Journal - June 2013 - 56
ASHRAE Journal - June 2013 - 57
ASHRAE Journal - June 2013 - Data Centers
ASHRAE Journal - June 2013 - 59
ASHRAE Journal - June 2013 - 60
ASHRAE Journal - June 2013 - 61
ASHRAE Journal - June 2013 - Emerging Technologies
ASHRAE Journal - June 2013 - 63
ASHRAE Journal - June 2013 - 64
ASHRAE Journal - June 2013 - 65
ASHRAE Journal - June 2013 - 66
ASHRAE Journal - June 2013 - 67
ASHRAE Journal - June 2013 - Engineer's Notebook
ASHRAE Journal - June 2013 - 69
ASHRAE Journal - June 2013 - 70
ASHRAE Journal - June 2013 - 71
ASHRAE Journal - June 2013 - IAQ Applications
ASHRAE Journal - June 2013 - 73
ASHRAE Journal - June 2013 - 74
ASHRAE Journal - June 2013 - 75
ASHRAE Journal - June 2013 - Special Products
ASHRAE Journal - June 2013 - 77
ASHRAE Journal - June 2013 - Refrigeration Applications
ASHRAE Journal - June 2013 - 79
ASHRAE Journal - June 2013 - Energy Modeling
ASHRAE Journal - June 2013 - 81
ASHRAE Journal - June 2013 - People
ASHRAE Journal - June 2013 - 83
ASHRAE Journal - June 2013 - Products
ASHRAE Journal - June 2013 - 85
ASHRAE Journal - June 2013 - 86
ASHRAE Journal - June 2013 - Classified Advertising
ASHRAE Journal - June 2013 - Advertisers Index
ASHRAE Journal - June 2013 - Cover3
ASHRAE Journal - June 2013 - Cover4
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