Fan Efficiency Grade Classification for Fans
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1 Fan Efficiency Grade Classification for Fans Dr. Michael Brendel Lau Industries/Ruskin Company Dayton, OH USA ASHRAE Annual Meeting 2012 San Antonio, TX
2 Learning Objectives 1. Describe Fan Efficiency Grade (FEG). 2. Describe the use and application of FEG. 3. Explain FEG for selection of efficient fan. 4. Provide an overview of how FEG will be used in the fan industry in the very near future. 5. Explain how standard and regulatory authorities will utilize FEG for setting requirements. 6. Describe the impact of FEG on fan technologies. ASHRAE is a Registered Provider with The American Institute of Architects Continuing Education Systems. Credit earned on completion of this program will be reported to ASHRAE Records for AIA members. Certificates of Completion for non-aia members are available on request. This program is registered with the AIA/ASHRAE for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material or product. Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation.
3 Outline Background Fan Energy Metrics Fan Efficiency FEG - Fan Efficiency Grade ASHRAE 90.1 and FEG
4 Energy Consumption US Energy Consumption 2010* = 98 Quads (104 EJ) Equivalent to 29 million million kwh 37% from petroleum transportation 21% from coal electricity 25% from natural gas residential, commercial, industrial Over half of source energy rejected (heat) FOCUS ON AIR DISTRIBUTION Estimated: DOE ~230 billion kwh for commercial/industrial fans Estimated: ~20% commercial building energy budget *source LLNL
5 HVAC System system equipment system Q Flow Energy per Unit Volume (Pressure) VP TP SP FAN FVP = fan velocity pressure (P v ) FTP = fan total pressure (P T ) FSP = fan static pressure (P)
6 Fan Energy Consumption Aerodynamic Losses Mechanical Losses Shaft Power, H (input) Fan Air Power, H o P T Q Acoustic Loss Energy Efficiency
7 Fan Energy Consumption - Example 25 Belt Drive Airfoil DWDI Blower Operating Point: 16, in-wg (total), 21.5 bhp, 80% FTE Operating Conditions: 50% duty cycle, $0.15/kWh Motor - 90% efficient, Drive - 90% efficient Shaft Power $10,543 Aerodynamic Loss ($1,302) Motor Output Power $11,714 Fan Bearing Loss ($807) Motor Input Power $13,016 Motor Drive Fan Air Power $8,435 Motor Loss ($1,302) Drive Loss ($1,171) Acoustic Loss (80 db 0.1 mw, <<1%) Annual Cost
8 Fan Energy Efficiency Fan Total Efficiency, FTE D 1 D 2 Normalized Flowrate, Q Minimum Fan Efficiency? eliminate small fans Peak Total Efficiency, pte D Impeller Diameter, D
9 Fan Energy Efficiency flow separation Small Diameter Impeller Large Diameter Impeller wheel wheel cone inlet cone gap = 1/4 (6 mm) 0.9% 27 (685 mm) impeller 2.5% 10 (254 mm) impeller Effect of Manufacturing Tolerances
10 Fan Energy Efficiency Grading Standards ISO I2759 Fans - Efficiency Classification for Fans AMCA 205 Energy Efficiency Classification for Fans
11 Fan Efficiency Grade Fan Efficiency Grade (FEG) 90 Peak Fan Total Efficiency, pte (%) Diameter impeller, pte = 60% FEG = 67 FEG 85 FEG 80 FEG 75 FEG 71 FEG 67 FEG 63 FEG 60 FEG 56 FEG 53 FEG Impeller Diameter (in)
12 Fan Efficiency Grade FEG Motor Drive Fan FEG Belt Drive Fan Motor Fan Direct Drive Fan
13 Fan Power Limitation ASHRAE : Fan Power Limitation (Tables A/B) Two Options motor nameplate hp & bhp Two Systems CV & VAV α = coefficient (hp/cfm), e.g for VAV systems A = pressure drop adjustment (hp) Q s = max design supply air (cfm) H = bhp
14 Fan Power Limitation Based on Specific Fan Power (SFP) approach Single fan α = limit, e.g for VAV systems B = A/Q s Q s = max design supply air (cfm) H = bhp Encourages low pressure drop and/or high fan efficiency
15 Fan Power Limitation Single fan example: 5 in-wg TP fan must be >60% FTE (VAV, bhp option) 100 SFP (hp/kcfm) Fan Total Efficiency (%) Non-compliant SFP (hp/kcfm) Fan Total Pressure (in-wg) [system restriction]
16 Fan Power Limitation + FEG Proposed minimum FEG67 + exclusions + 15pt selection condition + (> 5 hp motor) SFP (hp/kcfm) Peak Fan Total Efficiency (%) > Non-compliant FEG Diagram FEG Impeller diameter (in) Peak Fan Total Efficiency (%) Fan Total Pressure (in-wg) [system restriction]
17 Fan Power Limitation + FEG design point of operation shall be within 15 pts of the maximum total efficiency of the fan. FTP pte Fan Total Pressure, Fan Total Efficiency FTE 0 pts Flowrate
18 Fan Power Limitation + FEG design point of operation shall be within 15 pts of the maximum total efficiency of the fan. Fan Total Pressure, Fan Total Efficiency FTE FTP pte 2.5 pts Flowrate
19 Fan Power Limitation + FEG design point of operation shall be within 15 pts of the maximum total efficiency of the fan. Fan Total Pressure, Fan Total Efficiency FTE FTP pte 5 pts Flowrate
20 Fan Power Limitation + FEG design point of operation shall be within 15 pts of the maximum total efficiency of the fan. Fan Total Pressure, Fan Total Efficiency FTE FTP pte 10 pts Flowrate
21 Fan Power Limitation + FEG design point of operation shall be within 15 pts of the maximum total efficiency of the fan. Fan Total Pressure, Fan Total Efficiency FTE FTP pte 15 pts Flowrate
22 Fan Power Limitation + FEG Proposed minimum FEG67 + exclusions + 15pt selection condition + (> 5 hp motor) SFP (hp/kcfm) Fan Total Efficiency (%) pts FEG Diagram FEG Peak Fan Total Efficiency (%) 10 Impeller diameter (in) Fan Total Pressure (in-wg) [system restriction]
23 Summary Fan energy consumption regulation on the horizon Fan Efficiency only part of the story FEG aerodynamic indicator, focus on fan performance ASHRAE 90.1 has implicit fan efficiency requirement ASHRAE FEG proposed ASHRAE 90.1 generous operating efficiency band
24 Questions
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