ASHRAE Journal - February 2013 - 52

Average of All Projects

Baseline Exhaust
Fan Power (kW)

4.2

2.3

7.6

6.3

6.20

6.5

19.0

9.3

2.8

4.1

2.9

6.5

Baseline Makeup
Air Fan Power (kW)

3.1

1.5

6.4

n/a

6.50

5.5

9.0

3.7

1.9

1.3

n/a

4.3

Baseline Total
Fan Power (kW)

7.3

3.9

14.0

6.30

12.70

12.0

27.9

12.1

4.7

5.2

2.9

9.9

Total Fan
Power w/DCV (kW)

1.9

2.1

5.3

1.20

5.8

6.6

10.7

5.2

2.9

2.0

1.4

4.1

Operating Time
Per Day (h)

19.0

17.0

24.0

12.0

17.0

17.0

24.0

24.0

15.0

13.0

16.0

18.0

Operating Days
Per Year (d)

260

363

365

360

300

350

365

365

365

365

365

348

Total Fan Power
Reduction (kW)

5.4

1.8

8.7

5.1

7.0

5.4

17.2

6.90

1.8

3.20

1.50

5.8

Total Fan
Power Reduction (%)

74.0

46.0

62.0

80.0

55.0

45.0

62.0

57.0

38.0

62.0

52.0

57.0

Exhaust Fan
Speed Reduction (%)

36.0

18.0

28.0

42.0

23.0

18.0

27.0

25.0

15.0

27.0

22.0

26.0

Annual Baseline
Fan Energy (kWh/yr)

35,900

21,400

122,600

27,400

65,100

71,400 244,600 106,200 26,300

24,500

16,100

69,200

Annual Fan
Energy w/DCV (kWh/yr)

9,100

11,600

46,400

6,500

29,400

39,300

45,600

16,400

9,500

8,400

28,700

Annual Fan Energy
Savings (kWh/yr)

26,800

9,800

76,300

20,900

35,700

32,100 150,800 60,400

9,900

15,100

7,900

40,500

93,800

(Irwindale)

9.7

Quick Service
Restaurant (c)
2.5

(Quartz Hill)

4.0

Quick Service
Restaurant (b)

3.0

(El Monte)

Quick Service
Restaurant (a)

14.0

(Palm Desert)

21.0

(Santa Barbara)

20.0

(Berkeley)

8.0

(Brentwood)

n/a

Supermarket

15.0

(San Francisco)

3.0

Casual Dining
Restaurant

6.0

(San Ramon)

(Rancho Mirage)

Hotel Main Kitchen (c)

Hotel Main Kitchen (b)

University Campus
Dining Facility (b)

University Campus
Dining Facility (a)

Hotel Main Kitchen (a)

(Rancho Cucamonga)

Institutional Cafeteria
Rated Exhaust
Fan Power (HP)

Table 1: Field data for DCV systems in a variety of food-service operations.
The data in Table 1 and Figure 1 presents the total fan power
and fan speed reduction as measured for the 11 sites. All the
sites are within the climate zones of California. However, the
data was independent of the outside air conditions. The data
represent the average total fan energy savings of 57% and an
average reduction in exhaust airflow rates of 26%. The total
fan power and exhaust fan speed reductions are time-weighted
averages for the individual sites. The actual instantaneous reductions vary between the 100% maximum speed required at
full-load cooking conditions and typically 50% of maximum
speed during idle (ready-to-cook) conditions. This modulation
is illustrated in Photo 1 (Page 48) and Figure 2, which shows
52

ASHRAE Journal

the exhaust fan power levels for a wall-mounted canopy hood
being operated in a university campus dining facility.5
While the heating and cooling load reductions were not
calculated and reported, these loads can be predicted for any
climate zone using the OALC applying the average speed reduction (i.e., reduction in cfm). A guide to these calculations
was reported in a previous ASHRAE Journal article.2

Conclusions
Comprehensive field monitoring of DCV systems within
different types of commercial food-service facilities has documented the energy-saving potential of this variable speed techashrae.org

February 2013



ASHRAE Journal - February 2013

Table of Contents for the Digital Edition of ASHRAE Journal - February 2013

Contents
Commentary
Industry News
Letters
Meetings and Shows
Feature Articles
R-22 Hard Act to Follow: Ammonia Low-Pressure Receiver Systems
Long-Term Commercial GSHP Performance: Part 7: Achieving Quality
Thermally Active Floors: Part 2: Design
Future of DCV for Commercial Kitchens
Standing Columns and Special Sections
Building Sciences
Emerging Technologies
ACREX India 2013 Show Guide
Refrigeration Applications
InfoCenter
Data Centers
IAQ Applications
Special Products
Classified Advertising
Advertisers Index
ASHRAE Journal - February 2013 - Intro
ASHRAE Journal - February 2013 - Cover1
ASHRAE Journal - February 2013 - Cover2
ASHRAE Journal - February 2013 - 1
ASHRAE Journal - February 2013 - 2
ASHRAE Journal - February 2013 - Contents
ASHRAE Journal - February 2013 - Commentary
ASHRAE Journal - February 2013 - 5
ASHRAE Journal - February 2013 - Industry News
ASHRAE Journal - February 2013 - 7
ASHRAE Journal - February 2013 - 8
ASHRAE Journal - February 2013 - 9
ASHRAE Journal - February 2013 - 10
ASHRAE Journal - February 2013 - 11
ASHRAE Journal - February 2013 - Letters
ASHRAE Journal - February 2013 - 13
ASHRAE Journal - February 2013 - Meetings and Shows
ASHRAE Journal - February 2013 - 15
ASHRAE Journal - February 2013 - R-22 Hard Act to Follow: Ammonia Low-Pressure Receiver Systems
ASHRAE Journal - February 2013 - 17
ASHRAE Journal - February 2013 - 18
ASHRAE Journal - February 2013 - 19
ASHRAE Journal - February 2013 - 20
ASHRAE Journal - February 2013 - 21
ASHRAE Journal - February 2013 - 22
ASHRAE Journal - February 2013 - 23
ASHRAE Journal - February 2013 - 24
ASHRAE Journal - February 2013 - 25
ASHRAE Journal - February 2013 - Long-Term Commercial GSHP Performance: Part 7: Achieving Quality
ASHRAE Journal - February 2013 - 27
ASHRAE Journal - February 2013 - 28
ASHRAE Journal - February 2013 - 29
ASHRAE Journal - February 2013 - 30
ASHRAE Journal - February 2013 - 31
ASHRAE Journal - February 2013 - 32
ASHRAE Journal - February 2013 - 33
ASHRAE Journal - February 2013 - 34
ASHRAE Journal - February 2013 - 35
ASHRAE Journal - February 2013 - Thermally Active Floors: Part 2: Design
ASHRAE Journal - February 2013 - 37
ASHRAE Journal - February 2013 - 38
ASHRAE Journal - February 2013 - 39
ASHRAE Journal - February 2013 - 40
ASHRAE Journal - February 2013 - 41
ASHRAE Journal - February 2013 - 42
ASHRAE Journal - February 2013 - 43
ASHRAE Journal - February 2013 - 44
ASHRAE Journal - February 2013 - 45
ASHRAE Journal - February 2013 - 46
ASHRAE Journal - February 2013 - 47
ASHRAE Journal - February 2013 - Future of DCV for Commercial Kitchens
ASHRAE Journal - February 2013 - 49
ASHRAE Journal - February 2013 - 50
ASHRAE Journal - February 2013 - 51
ASHRAE Journal - February 2013 - 52
ASHRAE Journal - February 2013 - 53
ASHRAE Journal - February 2013 - 54
ASHRAE Journal - February 2013 - 55
ASHRAE Journal - February 2013 - Building Sciences
ASHRAE Journal - February 2013 - 57
ASHRAE Journal - February 2013 - 58
ASHRAE Journal - February 2013 - 59
ASHRAE Journal - February 2013 - 60
ASHRAE Journal - February 2013 - 61
ASHRAE Journal - February 2013 - 62
ASHRAE Journal - February 2013 - Emerging Technologies
ASHRAE Journal - February 2013 - 64
ASHRAE Journal - February 2013 - ACREX India 2013 Show Guide
ASHRAE Journal - February 2013 - 64b
ASHRAE Journal - February 2013 - S1
ASHRAE Journal - February 2013 - S2
ASHRAE Journal - February 2013 - S3
ASHRAE Journal - February 2013 - S4
ASHRAE Journal - February 2013 - S5
ASHRAE Journal - February 2013 - S6
ASHRAE Journal - February 2013 - S7
ASHRAE Journal - February 2013 - S8
ASHRAE Journal - February 2013 - S9
ASHRAE Journal - February 2013 - S10
ASHRAE Journal - February 2013 - S11
ASHRAE Journal - February 2013 - S12
ASHRAE Journal - February 2013 - S13
ASHRAE Journal - February 2013 - S14
ASHRAE Journal - February 2013 - S15
ASHRAE Journal - February 2013 - S16
ASHRAE Journal - February 2013 - S17
ASHRAE Journal - February 2013 - S18
ASHRAE Journal - February 2013 - S19
ASHRAE Journal - February 2013 - S20
ASHRAE Journal - February 2013 - S21
ASHRAE Journal - February 2013 - S22
ASHRAE Journal - February 2013 - Refrigeration Applications
ASHRAE Journal - February 2013 - InfoCenter
ASHRAE Journal - February 2013 - 67
ASHRAE Journal - February 2013 - 68
ASHRAE Journal - February 2013 - 69
ASHRAE Journal - February 2013 - 70
ASHRAE Journal - February 2013 - 71
ASHRAE Journal - February 2013 - Data Centers
ASHRAE Journal - February 2013 - 73
ASHRAE Journal - February 2013 - 74
ASHRAE Journal - February 2013 - IAQ Applications
ASHRAE Journal - February 2013 - 76
ASHRAE Journal - February 2013 - 77
ASHRAE Journal - February 2013 - Special Products
ASHRAE Journal - February 2013 - Classified Advertising
ASHRAE Journal - February 2013 - Advertisers Index
ASHRAE Journal - February 2013 - Cover3
ASHRAE Journal - February 2013 - Cover4
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