1.application of uv-c 2.problems with hvac systems 1.how does uv-c help? 3.what is uv-c 4.how do...
TRANSCRIPT
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1. Application of UV-C
2. Problems with HVAC Systems
1. How does UV-C help?
3. What is UV-C
4. How do UV-C Lamps Work
5. ASHRAE Update
6. CDC and GSA specifications
7. Questions
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Applications
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UV in HVACR System Goals
Control Bio-Film
Control Bio-aerosols
Degrade Other Organic Debris
Maintenance
Who enjoys cleaning coils?
So To Reduce:
IAQ Problems
Absenteeism
Energy Use
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Bio-Contamination
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Bio-Contamination
Causes:
Higher Coil ΔP
Reduced:
Air FlowHeat Exchange EfficiencyDrain Pan Drainage
Source of:
MycotoxinsEndotoxinsMicrobial VOCOther Odor
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Bio-Lunch at a Well Known
Tobacco Plant
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Various Infected Coils & Drain Pans
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Plenums, Fans & Dampers
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Hospital Drain Pans & Overflow
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Mold Growth in Filter
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Mold on Fan
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Coil Surface Samples
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THE PROBLEM
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Depending on the region, more than half the energy consumed
can be for powering air conditioning and refrigeration
equipment.And electrical power costs are often
the largest expenditure for most
occupied buildings.
Reducing energy use while
improving the working
environment of a building has
always been a common goal.
Ventilation& Cooling
52% Lighting31%
Other17%
Energy Consumption
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Organic Matter Buildup Lowers Coil Efficiency / Increase in Coil Pressure
Add only .006”
of bio film:
New Clean Coil:
Optimum cooling/ Design=
Decreased efficiency =
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Typical Responses To The Problem
Speed up Fan Lower Coil Water TempPump More Chilled Water
Increased kWh Usage on Fan
Motors
= Increased kWh Usage on Pump Motors= Significantly
Increases kWh Usage on Chiller
=
INCREASED ENERGY COSTS
a
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THE SOLUTION
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Restore The Coil Efficiency
Energy is Reflected Through The Coil
UV-C Energy Vaporizes Organic Matter
Week One Week Five
UV-C on The Coil
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Harvesting Energy Savings From A Restored Cooling Coil
Slow Down Fan Raise Coil Water TempPump Less Chilled Water
Restored kWh Usage = Restored kWh
Usage = Restores Significant kWh Usage=
SUSTAINABLE ENERGY SAVINGS
a
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UVC-HVAC Applications
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What is UV-C
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Light Spectrum
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Ultraviolet Light Spectrum 1nm = 1/1000 micron
UV-A (315nm - 400nm) - Includes black lights, sun tanning lamps and it is harmful to eyes
UV-B (280nm - 315nm) - Causes sunburn and Skin cancer
UV-C (200nm - 280nm) - Is naturally germicidal, damages the DNA of microbes and more
The Sun produces all 3, UV-A & UV-B make it
through the Earth’s atmosphere. UV-C is
mostly filtered out
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DNA Response to UV Energy
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Light Spectrum
Germicidal UV-C Lamp 253.7 nm
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Cell Destruction
Electromagnetic energy breaks through cell wall
Damages DNA
Cannot reproduce or feed
Cell “Dies”
UVC energy enters the cell
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DNA Damage
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Lamps
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Many kinds of lamps
Black light UV-A
UV-CGermicidal
Fluorescent
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Fluorescent
Impure or “junk” glass; does not transmit UV-C
Contains Mercury (Hg)
Contains Phosphor
Contains Noble gas (Argon is the most common)
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Germicidal Lamps
Glass that transmits UV-C
Quartz
Soda Barium (“soft glass”)
Phosphor is removed
Contains Mercury (Hg)
Majority use Argon some use a mixture of Argon/ Neon or maybe a little Xenon
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Fluorescent Vs. UV-C Lamps
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Lamp Wattage/ OutputPhilips Lamp Description Lamp Wattage Diameter µW/CM2
Philips TUV 4W 4 T5 9
Philips TUV 6W 6 T5 15
Philips TUV 8W 8 T5 21
Philips TUV 10W 10 T8 23
Philips TUV 11W 11 T5 26
Philips TUV 15W 15 T8 48
Philips TUV 16W 16 T5 45
Philips TUV Fl7T8 17 T8 88
Philips TUV 25W 25 T5 69
Philips TUV 25W 25 T8 69
Philips TUV 30W 30 T8 100
Philips TUV 36W 36 T8 145
Philips TUV 55W HO 55 T8 150
Philips TUV 75W HO 75 T8 220
Philips TUV 115W-R VHO 115 T12 610
Philips TUV 115W VHO 115 T12 360
Philips TUV 240W XPT 240 T6 800
Philips TUV 270W XPT 270 T10 920
Philips TUV PL-S 5W/2P 5 PLS 9
Philips TUV PL-S 7W/2P 7 PLS 15
Philips TUV PL-S 9W/2P 9 PLS 22
Philips TUV PL-S I I W/2P 11 PLS 33
Philips TUV PL-S I 3W/2P 13 PLS 31
Philips TUV PL-L I 8W/4P 18 PLL 51
Philips TUV PL-L 24W/4P 24 PLL 65
Philips TUV PL-L 35W/4P HO 35 PLL 105
Philips TUV PL-L 36W/4P 36 PLL 110
Philips TUV PL-L 55W/4P HF 55 PLL 156
Philips TUV PL-L 60W/4P 60 PLL 166
Philips TUV PL-L 95W14P HO 95 PLL 250
Philips TUV 36T5 40 T5 144
Philips TUV 64T5 75 T5 280
Philips TUV 36T5 HO 75 T5 230
Philips TUV 64T5 HO 145 T5 442
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Lamp Intensity
Philips TUV PL-L 35W/4P HO 35 PLL 105
Philips TUV PL-L 36W/4P 36 PLL 110
Philips TUV PL-L 55W/4P HF 55 PLL 156
Philips TUV PL-L 60W/4P 60 PLL 166
Philips TUV PL-L 95W14P HO 95 PLL 250
Philips TUV 36T5 40 T5 144
Philips TUV 64T5 75 T5 280
Philips TUV 36T5 HO 75 T5 230
Philips TUV 64T5 HO 145 T5 442
For a variety of low pressure mercury TUV lamps, the irradiance values at I meter distance are expressed below.
Philips Lamp Description Lamp Wattage Diameter Microwatt/CM2
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Intensity Factors
Lamps follow the inverse square law
Closer to the lamp the higher the intensity
Lamp Intensity Factors Lamp µW/CM2
Philips TUV 64T5 HO 442
Distance from Lamp (inches) Intensity µW/CM2
2 32.3 14277
3 22.8 10078
4 18.6 8221
6 12.9 5702
8 9.85 4354
10 7.94 3509
12 6.48 2864
14 5.35 2365
18 3.6 1591
24 2.33 1030
36 1.22 539
39.37 1 442
48 0.681 301
60 0.452 200
80 0.256 113
100 0.169 75
120 0.115 51
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Safety
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UV-C Exposure limits
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UV-C Exposure
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Radiometer
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HVAC Applications for UV-C
Two distinct applications for UVC
Decontaminating surfaces
CoilsFilters “capture and kill”
Decontaminating moving air-streams
(“on-the-fly”)
“Coil”800 MicroWatt/cm2
shown
“On-The Fly”Shown is 12,000 MicroWatt/cm2
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ASHRAEAmerican Society of
Heating, Refrigerating and Air-Conditioning Engineers
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ASHRAE Highlights2005 -TG 2.UVAS created in Winter Meeting 2005 (Orlando)
2006 - TG 2.UVAS was turned into a full TC (TC-2.9)
2006 - SPC-185.1 was formed (“On-the-Fly” kill)
2007- SPC-185.2 was formed (Surface kill)
2008 - ASHRAE Fundamentals Handbook Published Chapter 16 Highlights UV Fundamentals.
2009 – ASHRAE Board of Directors publishes a position paper on Airborne Infectious Diseases…highlights UV-C
2011 – SPC-185.1 goes out for public review
2011 – AHSRAE HVAC Applications Handbook Published Chapter 60 covers UV applications
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2008 Fundamentals Handbook
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2011 HVAC Applications Handbook
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SPC-185
SPC-185.1 - MOT.UVC Lights for use in air handling units or air ducts to inactivate airborne microorganisms
• 1. PURPOSE
This standard establishes a test method for evaluating the efficacy of a UVC device for inactivating airborne microorganisms in a moving air stream.
SPC-185.2- Method of Testing Ultraviolet Lamps for Use in HVAC&R Units or Air Ducts on Irradiated Surfaces.
• 1. PURPOSE
This standard establishes a test method for measuring the intensity of ultraviolet lamps on irradiated surfaces under typical HVAC&R operating conditions
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Position Document
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Airborne Infectious Diseases
There are three general UVGI strategies: installation into ventilating ducts, irradiation of the upper zones of occupied spaces, and in-room irradiation after one occupant and before the next.
Filtration and UVGI controls research are given top priority because less is known about how these controls can be applied in buildings and HVAC systems to decrease disease events.
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Research Priority
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ASHRAE 2012-New Committee
New Committee is being formed to write “PD” position documents for “Air Cleaning Devices”
Air Filtration
UV-C
Others
Will last 18 months
10 – 15 documents will be presented to ASHRAE for publication.
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CDC Guidelines
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TB in Pakistan
Tuberculosis (TB), an illness that mainly affects the respiratory system, is one of the world's most pernicious diseases.
TB currently infects one-third of the world's population and kills approximately 1.7 million people each year.
Tuberculosis is a leading killer of young adults worldwide
Pakistan cases are estimated at 286,000 annually
Pakistan ranked 6th in the world on TB burden
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CDC
Because of the results of numerous studies (116-120) and the experiences of TB clinicians and mycobacteriologists during the past several decades, the use of UVGI has been recommended as a supplement to other TB infection-control measures in settings where the need for killing or inactivating tubercle bacilli is important (2,4,121-125).
Commercially available UV lamps used for germicidal purposes are low-pressure mercury vapor lamps (127) that emit radiant energy in the UV-C range, predominantly at a
wavelength of 253.7 nm (128).
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Correctional Facilities
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GSA Specification
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GSA Specification
Implemented in 2000Last revision was in 2005
Section Five, Sub-Section 5.8, Page 135
HVAC Components
Revised March 2005 – PBS-P100
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GSA Section 5.8, pg 135
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UL 1995- “proposed”
Will require AHU manufactures to test for leaking of UV from cabinets.
The emissions from the equipment shall not exceed an effective irradiance value of 0.1 microWatts/cm2
The ratings of the ultraviolet (UV) radiation lamp system shall include, lamp rating in watts and voltage.
Conclusion:
OEM’s will rate cabinets for the maximum “Lamp Watts”
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Take Away
Remember ALL Germicidal lamps have their output at 253.7nm
Wattage dictates output…higher wattage = More UV-C output
Finally, A Watt is A Watt
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UV-C Benefits
Improves Indoor Air Quality (IAQ)
Cleans coils and drain pans
Recovers coil efficiencies
Reduces energy consumption
ASHRAE acceptance
Two chapters, two proposed test standards & Position Documents
Should be a “Standard of Care”
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Thank You