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Impact of Various Lamp Intensity Measurement Methods on the End of Lamp Life (EOLL) of Low-pressure High-output Germicidal UV lamps
B. Ferran1, W. Yang1, N. Fontaine2
1Suez WTS, 600 Willow Tree Road, Leonia, NJ 07605
2Carollo Engineers, 2880 Gateway Oaks Drive, Suite 300 Sacramento CA 95833
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Introduction
• The 2003 NWRI UV Disinfection Guidelines stipulate that to account for the degradation in lamp UVC output over time, the design UV dose of a UV plant must be adjusted using an EOLL, or lamp aging factor.
• Suez WTS conducted a third party aging test on a batch of 18 aquaray®
3X lamps of the low-pressure high-output type.
• Testing was conducted per the 2003 NWRI UV Guidelines as the 2012 NWRI UV Guidelines were issued after the start of the study
• Lamps were measured both in-air and in-water to evaluate the progressive change in UVC output over time
• End of life test data is compared between in-air & in-water measurements
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Methodology
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• The lamps were aged inside a full-scale
UV module submerged in a tank filled
with temperature controlled and
circulating water.
• All lamps were aged at maximum
electrical power using the same power
centers as in the field.
• The lamps were aged under varying
water temperatures
Aging
Tank
Chiller
Aging Module
Lamp Aging Test Setup
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Methodology
Lamp
3-meter distance
IL1700 SED240 cell
IL1700 Radiometer
Dark room for lamp output
measurements in air
• Lamp output measurements in air were
conducted in accordance with the
original 2008 IUVA methodology.
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Methodology
5 Sensor Ports
Temperature probe
Cooling water
IL1700 SED240 cell
• Lamp testing in water was conducted using
a single-lamp stainless steel vertical
chamber continuously fed with high
transmittance temperature controlled water.
• Local intensities were measured through
water using an IL1700 radiometer with the
SED240 cell at five fixed locations
alongside the lamp axis.
• Temperatures at the bottom and top of the
water chamber were monitored to confirm
proper cooling at all times.
Test chamber for intensity
measurements in water
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Results
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EOLL versus Percent of Nominal Lifetime
• The relative output for each session was calculated by dividing the average
measured intensity from the test lamps by the average measured intensity
from reference lamps.
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• The EOLL for the aquaray® 3X lamp obtained from in-air and in-water
measurements is the same at 0.90.
• Between 11% and 58% of nominal lamp lifetime the lamp output
measurements collected in-water resulted in slightly lower EOLL values
compared to in-air.
• At 58% of nominal lifetime and greater the measured EOLL factors
became similar regardless of the measurement approach.
Results
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• The data generated from this aging test yields the same EOLL
regardless of whether the test lamps were measured in-air for output or
in-water for intensity.
• Note that those EOLL values from in-water measurements were slightly
lower than their in-air counterpart for approximately half of the entire test
period.
Conclusion
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