Measured Performance of Residential Gas Water Heaters
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1 Measured Performance of Residential Gas Water Heaters Dan Cautley ACEEE Hot Water Forum May 13, 2010
2 Today s topics Intro Efficiency & operating costs Flow in venting system, added infiltration Vent spillage Loads & delivery temperature Misc practical issues
3 Introduction Funding DOE State Technologies Advancement Collaborative WI Dept of Administration, Div of Energy Services (public benefits) Material contribution from AO Smith corp Other participants include LBNL, BNL, and ACEEE Objectives of ECW field monitoring Measure conditioned-air loss Determine efficiencies (old & new) Investigate spillage
4 Existing Water Heaters 10 homes in S. Wisconsin Natural gas water heaters (WH) WH vintage: 1977 to 2003 (8) 40 gallon, (2) 50 gallon Variety of household sizes & usage
5
6 Condition of 10 existing water heaters Mineral buildup: 2 severe (inches thick) Dip tubes 2 nonexistent 1 broken off at top (in transit??) 2 had longitudinal cracking 5 intact Anode rods: 8 were nonexistent
7 New water heaters (1) FVIR atmospheric tank type (short-term test) (4) power vent 40 gallon (1) 50 gallon condensing efficiency storage type (4) non-condensing tankless (1) condensing efficiency tankless
8
9 Primary measurements Hot water flow Cold & hot water temperature Burner run time (& gas flow in some) Vent pressure, temperature Zone pressure, outdoor temperature CO2 (& CO) in vent, flue, & room Oxygen (part-time)
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11
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16 Efficiency Combustion (steady state, recovery) η Energy to water / Fuel energy Instantaneous Input-output (EF) Hot water delivered / Fuel energy Over time (e.g. daily) Other (draw different boundaries)
17 Combustion Efficiency 0.84 Site A (non-fvir) Combustion effiency Measurement period for steady-state efficiency 95th percentile 75th percentile 0.76 median 25th percentile 5th percentile Elapsed minutes of firing Data are for 105 firing episodes, and are grouped in 5-second bins of elapsed firing time. Bins with <25 data points are omitted.
18 Input-output efficiency 1.5 Site D (non FVIR) Daily gas input (therms) Daily hot water output (therms)
19 A 45.7% 76.3% B C 42.9% 46.3% 81.5% 80.4% D E 35.1% 37.6% 77.1% 80.0% E (FVIR) 24.2% 75.7% F (FVIR) 59.3% 81.0% G 14.2% 80.3% H 51.5% 81.2% I 33.7% 79.0% J -4.8% 73.4% -10% 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% Median steady state on cycle thermal efficiency Median off cycle thermal efficiency
20
21 Instantaneous efficiencies (old WH) Measured comb eff Measured in-out slope GAMA Rec Eff 0.80 Recovery efficiency A natural draft B natural draft C natural draft * D natural draft E natural draft G natural draft H natural draft I natural draft J natural draft E FVIR F FVIR *
22 Instantaneous efficiencies (new WH) Measured comb eff Measured in-out slope GAMA Rec Eff C power vent D power vent G power vent J power vent F power vent, condensing A tankless E tankless H tankless I tankless B tankless, condensing Recovery Efficiency
23 Energy factor: data vs GAMA EF from data GAMA EF Energy Factor B natural draft C natural draft D natural draft E natural draft G natural draft H natural draft I natural draft E FVIR C power vent D power vent G power vent J power vent
24 Estimated stack & jacket losses 25,000 20,000 Est jacket loss Off-cycle stack loss (23 hrs) Losses (Btu/day) 15,000 10,000 5,000 - A natural draft B natural draft C natural draft D natural draft E natural draft G natural draft H natural draft I natural draft J natural draft E FVIR F FVIR
25 Operating costs: 65 F temp rise, $1/therm,.13/KWH $350 Tank ( ) $300 Power-vent (new) Power-vent, condensing (new) $250 $200 Tankless, non-condensing (new) Tankless, condensing (new) $150 $ $ $ Gallons per day
26 Estimated operating costs by fuel (75 gal/day) $300 $250 Electric Gas $200 $150 $100 $50 $0 Tank ( ) Power-vent (new) Vertex (new) Tankless, noncondensing (new) Tankless, condensing (new)
27 Vent system flows
28
29 Airflow through water heater flue and draft diverter Daily vent airflow 60F) Site B (non-fvir) Flue Draft diverter Daily outdoor temperature (F)
30 Water heater vent flow (average)
31 Heating penalty from loss of conditioned air - method Measure off-cycle and on-cycle vent flow (stoichiometry) Fit linear model of flow and vent pressure Find relationship of vent pressure (flow) with outdoor temperature Estimate contribution to infiltration Sum infiltration x temp diff for heating season
32 Estimated annual heating infiltration load penalty from natural-draft water heaters (for Madison, WI), by operating mode contribution A B C D E (FVIR) E F (FVIR) G H I J for Madison, WI Estimated annual infiltration load (therms) WH Off-cycle WH On-cycle WH off-cycle, HTG on-cycle (shared venting) WH on-cycle, HTG on-cycle (shared venting)
33 Vent spillage
34 Vent pressure during main burner firing 0 Vent pressure (Pascals) minimum draft requirement per WI weatherization program For outdoor temperatures between 21 and 40F E (non-fvir) G (non-fvir) E (FVIR) D (non-fvir) B (non-fvir) I (non-fvir) C (non-fvir) J (non-fvir) A (non-fvir) F (FVIR) (smoothed data) Elapsed firing minutes
35 Vent pressure slope with Tout A (non-fvir) B (non-fvir) C (non-fvir) D (non-fvir) E (non-fvir) E (FVI R) F (FVIR) G (non-fvir) I (non-fvir) J (non-fvir) Change in vent pressure per 10F change in outdoor temperature (Pascals)
36 Spillage on startup A1 B1 C1 D1 E1 Site E2 F2 G1 H1 I1 J1 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Firing events with spillage
37 Positive vent pressure (off cycle) Site A1 B1 C1 D1 E1 E2 F2 G1 H1 I1 J1 0.12% 0.07% 0.02% 0.16% 0.10% 0.03% 0.00% 0.01% 0.00% 0.00% 1.91% 0.0% 0.2% 0.4% 0.6% 0.8% 1.0% 1.2% 1.4% 1.6% 1.8% 2.0% Vent pressure reversal (off cycle)
38 +6 Site G, February 20, spillage event Site G, March 3-4, spillage event
39 Loads and delivery temperature
40 Fraction of hot water drawn in events up to X gallons, all sites
41 Delivery temperature dropoff in healthy water heater 140 Site D, water heater ID 1 Hot water temperature (F) Cumulative gallons
42
43
44 Temperature dropoff with volume, atmospheric vs new power vent No dip tube No dip tube Power Vent
45 Delivery temperature, tankless unit 140 Site I, water heater ID 5 Hot water temperature (F) Cumulative gallons
46 Delivery temperature, condensing tankless unit 140 Site B, water heater ID 6 Hot water temperature (F) Cumulative gallons
47 Practical installation and operating considerations
48 Venting Power vent and tankless condensing units PVC venting. Can run 100+ feet with proper vent size Tankless non-condensing Can run 35 ft (1 elbow), 23 ft (3 elbows) Concentric aluminum-in-pvc vent pipe, very expensive
49 Gas meter and piping Tankless water heaters have inputs of 150,000 to 200,000 BTU/hr (some even higher) Gas piping and gas meter must be sized to meet maximum demand
50 Minimum flow Tankless water heaters require a minimum flow rate before burner will start, typically about 0.5 gal/min. Many dishwashers draw 0.5 gpm or less when filling, and will not trigger water heater operation no easy fix Incidental draws and leaks do not carry an energy penalty with tankless water heaters
51 Major leak: up to 100 gal/day
52 Thank You!
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