CenterPoint Energy, Inc (Holding Co) · NYSE:CNP

CenterPoint Energy, Inc (Holding Co) — Technical Presentation (November 2012)

55 slides from CenterPoint Energy, Inc (Holding Co)'s technical presentation, Nov 15, 2012

  1. Slide 1: Increase Productivity & Reduce Absenteeism with Humidity Control

    Increase Productivity & Reduce Absenteeism with Humidity Control November 15, 2012 Moderators: Rafi Sohail & Nicholas Vanduzee Speaker: Eric Burgis, Energy Solutions Center

  2. Slide 2: Housekeeping

    Housekeeping  You are in ‘Listen Only’ mode. If you have a question during the webinar, please click the + symbol next to the Question pane of your Control Panel. Type in your question and submit it to the Moderators.  A copy of the presentation will be e-mailed to you in the next day or two along

  3. Slide 3: Today's topics

    Today’s topics  Understanding Humidity Control  Equipment Types  Dehumidification  Humidification  Other Considerations  Life Cycle Costs © 2012 Energy Solutions Center Inc. All Rights Reserved 3

  4. Slide 4: What is Humidity

    What is Humidity  Humidity is a term for the amount of water vapor in the air  Optimum indoor relative humidity level is 30% to 60% 1  Best range for occupant health is 40% - 50% The amount of water vapor in the Humidity atmosphere, usually expressed as either absolute humidity or relative humidi

  5. Slide 5: Comfort

    Relative Humidity (RH) Percentage  This chart illustrates the RH comfort level for 80% or more of the occupants in a space Ideal Range Comfort Uncomfortably Comfort Uncomfortably Dry Range Wet Ideal Range 40 50 0 25 50 60 75 100 © 2012 Energy Solutions Center Inc. All Rights Reserved 5

  6. Slide 6: How warm do you feel?

    How warm do you feel?  A person’s comfort depends on the direct effect of temperature and humidity. If either are too high or too low they can have a Typically humidity is too high in the summer and too low in the winter. The significant effect on Heat Index (HI) or the "Apparent comfort level. Tem

  7. Slide 7: Humidity Control

    Humidity Control  Humidity is a component of indoor air quality  Too much or too little moisture equals uncontrolled humidity in the space  Uncontrolled humidity negatively affects people, buildings and equipment/supplies © 2012 Energy Solutions Center Inc. All Rights Reserved 7

  8. Slide 8: Humidity Control

    Humidity Control  Uncontrolled humidity negatively impacts:  HVAC systems  Energy costs  Building structure and systems  Furnishings, equipment and supplies  Comfort of building occupants  Health of building occupants © 2012 Energy Solutions Center Inc. All Rights Reserved 8

  9. Slide 9: High Humidity Impacts

    High Humidity Impacts  Heating/Cooling costs  Systems work harder and longer to maintain desirable temperature, using more energy and increasing operating costs  Integrity of building structure and systems  Condensation on metal structures contributes to oxidation and early failure  Condensatio

  10. Slide 10: High Humidity Impacts

    High Humidity Impacts  Integrity of building structure and systems  Excess moisture contributes to growth of damaging mold and mildew  Damages furnishings, equipment and supplies  Comfort of building occupants  Excess humidity in Summer makes you feel hot and cold and clammy in winter © 2012 En

  11. Slide 11: High Humidity Impacts

    High Humidity Impacts  Health of building occupants  High humidity contributes to growth of disease- causing microbes – bacteria, mold, fungi  Contributes to Sick Building Syndrome – aggravating allergies, asthma, etc. © 2012 Energy Solutions Center Inc. All Rights Reserved 11

  12. Slide 12: Low Humidity Impacts

    Low Humidity Impacts  Integrity of building structure and systems  Static electricity impacts computers  Too little moisture can dry out wall coverings, floor and ceiling tiles, furniture  Comfort of building occupants  Too little moisture makes occupants feel colder in winter © 2012 Energy Sol

  13. Slide 13: Low Humidity Impacts

    Low Humidity Impacts  Health of Building Occupants  Low humidity aggravates asthma, allergies and other respiratory-related illnesses  Impacts employee productivity and absenteeism  Winter dryness causes cracked lips, dry skin, and bloody noses © 2012 Energy Solutions Center Inc. All Rights Rese

  14. Slide 14: Proper Humidity Impacts

    Proper Humidity Impacts  Comfort of building occupants  Proper humidity helps control unpleasant odors  Proper humidity levels help control growth of bacterial and mold and can reduce the spread of viruses such as influenza  People feel more comfortable at proper humidity levels  Save Energy re

  15. Slide 15: Health Impact of Uncontrolled Humidity

    Health Impact of Uncontrolled Humidity Optimum Level H1N1 Influenza © 2012 Energy Solutions Center Inc. All Rights Reserved

  16. Slide 16: Science and Engineering

    Science and Engineering Please note that the following several slides are meant to be an overview only. It is very is difficult to explain and understand psychrometrics The main point is that too much or too little humidity is not good © 2012 Energy Solutions Center Inc. All Rights Reserved 16

  17. Slide 17: Psychrometric Charts

    Psychrometric Charts Understanding psychrometric charts helps with visualization of environmental control concepts such as why heated air can hold more moisture, and conversely, how allowing moist air to cool will result in condensation continued © 2012 Energy Solutions Center Inc. All Rights Reserv

  18. Slide 18: Psychrometric Charts

    Psychrometric Charts These charts also show the temperature that condensate will form for a given scenario © 2012 Energy Solutions Center Inc. All Rights Reserved 18

  19. Slide 19: How a Desiccant System Works on a Psychrometric Chart

    How a Desiccant Gas Air Heat Heater Exchanger System Works on a Outdoor or Exhaust Air Psychrometric Cooling Chart MOISTURE Coil 140 A B C D Outdoor Air 120 100 G A R 80 A Desiccant I Wheel D 60 N C 40 S B 20 30 40 50 60 70 80 90 100 110 120 TEMPERATURE oF © 2012 Energy Solutions Center Inc. All Rig

  20. Slide 20: Measurement

    Measurement  There are various devices used to measure and regulate humidity  Humidity measurement uses a psychrometer or hygrometer  A humidistat is used to regulate the humidity of a building  These can be analogous to a thermometer and thermostat for temperature control © 2012 Energy Solution

  21. Slide 21: Sling Psychrometer

    Sling Psychrometer  Incorporates two bulbs – one wet and one dry  This is a basic High School chemistry lab experiment  After a short time, the water on the wet bulb evaporates and at that time, the temperature is measured of each bulb  The delta between the temperatures is noted and the ambient

  22. Slide 22: Psychrometer Types

    Psychrometer Types Sling Psychrometer Digital Psychrometer © 2012 Energy Solutions Center Inc. All Rights Reserved 22

  23. Slide 23: Hygrometer

    Hygrometer  An instrument used for measuring the moisture content in the environmental air or humidity  Devices use temperature of condensation, or changes in electrical capacitance or resistance to measure humidity changes. © 2012 Energy Solutions Center Inc. All Rights Reserved 23

  24. Slide 24: Types of Hygrometers

    Types of Hygrometers  Metal Coil Type  Provides a dial indication of humidity changes  Hair Tension  Uses a human or animal hair under tension  The length of the hair changes with humidity and the length change may be magnified by a mechanism and/or indicated on a dial or scale  Electronic con

  25. Slide 25: Types of Hygrometers

    Types of Hygrometers  Electronic  Chilled mirror dew point hygrometers – use a chilled mirror and optoelectronic mechanism to detect condensation on the mirror  Capacitive humidity sensors, the effect of humidity on the dielectric constant of a polymer or metal oxide material is measured  Resist

  26. Slide 26: Hygrometers

    Hygrometers Chilled Mirror Type Metal Coil Type Resistive Humidity Capacitive Sensor Hair Tension Humidity Type Sensor © 2012 Energy Solutions Center Inc. All Rights Reserved 26

  27. Slide 27: Everyday Hygrometers

    Everyday Hygrometers Typically $5 to $25 at your local department or hardware store © 2012 Energy Solutions Center Inc. All Rights Reserved 27

  28. Slide 28: A last bit of Engineering

    A last bit of Engineering  Latent Cooling  Cooling the moisture in the air which leads to condensation of moisture on the cooling coils  Gas-fired desiccants remove moisture before the cooling coils reducing the latent cooling load continued © 2012 Energy Solutions Center Inc. All Rights Reserved

  29. Slide 29: A last bit of Engineering

    A last bit of Engineering  Sensible Cooling  Cooling the air itself to reasonable ambient temperature  Removal of moisture with desiccant means sensible cooling becomes primary load.  Overall reduction in total cooling load. © 2012 Energy Solutions Center Inc. All Rights Reserved 29

  30. Slide 30: Available Technologies

    Available Technologies Conventional systems Dehumidification Equipment Humidification Equipment © 2012 Energy Solutions Center Inc. All Rights Reserved 30 30

  31. Slide 31: Components of Cooling

    Components of Cooling  Space cooling accomplished by maintaining both components of cooling:  Temperature (sensible cooling)  Humidity (latent cooling)  With dry air, it is very easy to regulate temperature © 2012 Energy Solutions Center Inc. All Rights Reserved 31

  32. Slide 32: Drying Air with Conventional HVAC

    Drying Air with Conventional HVAC Condenser Coil Blower Filter Compressor Moisture to Outside Supply Air Return Air Moisture in the air stream condenses out naturally as it comes in contact with the cooling coil. The air conditioner works harder and uses more energy, but does dehumidify while operat

  33. Slide 33: Problem with using conventional air conditioning to dehumidify

    Problem with using conventional air conditioning to dehumidify.  In high humidity climates in the summer, the air conditioner needs to be set at a very low temperature to be able to remove enough humidity – often called ‘Sub-Cooling’  Occupants do not like 50 Degree F air blowing on them or 60 Deg

  34. Slide 34: Problem with using conventional air conditioning to dehumidify

    Problem with using conventional air conditioning to dehumidify  Sub-Cooling and Re-heating is not very energy efficient, but is a normal practice in commercial buildings.  Conventional air conditioning  Attempts to cool (temperature) and remove moisture (humidity)  Compromise = loss of efficienc

  35. Slide 35: Desiccant Dehumidification Wheel Type (Dry)

    Desiccant Dehumidification Wheel Type (Dry)  Natural Gas Desiccant Dehumidification  Desiccant dehumidification – assumes responsibility for humidity only  Sized from Residential through Industrial  Direct gas fired or hot water regeneration 300 cfm – 400 cfm 300 cfm – 120,000 cfm © 2012 Energy

  36. Slide 36: Basic Desiccant Wheel Process

    Basic Desiccant Wheel Process  Porous wheels are coated in a special humidity- absorbing material called a desiccant  Often Silica Gel is used as the desiccant  When exposed to moist air the desiccant absorbs the moisture  The humidity-saturated section of the wheel is then rotated to a position

  37. Slide 37: Wheel Technology

    Wheel Technology Process Air Section Drive Belt Small HP Rotation Low Speed Regeneration Motor Section: Outside air is heated and passed through the wheel to drive off moisture which is sent outdoors with exhaust air stream © 2012 Energy Solutions Center Inc. All Rights Reserved 37

  38. Slide 38: Wheel Type – How It Works

    Wheel Type – How It Works ~ 190oF REACT. HEAT 1. Air to be dried SOURCE STEP 3 2. Dried air delivered to STEP 4 REACT. occupied space REACT. OUTLET INLET 3. Air flow to drive moisture off desiccant wheel AIR INLET DRY AIR OUTLET STEP 1 STEP 2 4. Hot, wet air to be exhausted © 2012 Energy Solutions C

  39. Slide 39: Reactivation of Desiccant Wheel

    Reactivation of Desiccant Wheel  Heat for reactivation of the wheel is accomplished between 120-190oF  Available sources  Natural gas heater  Hot water / steam  Electric element  Waste heat © 2012 Energy Solutions Center Inc. All Rights Reserved 39

  40. Slide 40: Liquid Desiccants

    Liquid Desiccants  For larger Commercial and Industrial Applications  Chemical adsorption process  Size range  1000 CFM to 84,000 CFM © 2012 Energy Solutions Center Inc. All Rights Reserved 40

  41. Slide 41: Liquid Type – How it Works

    Liquid Type – How it Works Conditioner (Process Air) A. Air In – Air to be dried. E B. Packing Blocks - Liquid desiccant absorbs C moisture D C. Heat Exchanger – Gas- B fired burner heats the liquid to drive off absorbed moisture A D. Hot Moist Air Out – Hot, wet air from liquid exhausted outside Re

  42. Slide 42: Advantages of Natural Gas Desiccant Dehumidification

    Advantages of Natural Gas Desiccant Dehumidification  Reduces growth of disease-causing microbes  Controls odors, mold and mildew  Eliminates condensation  Increases comfort of building occupants  Prevents damage to furnishings, carpeting, tiles, and other building materials continued © 2012 En

  43. Slide 43: Advantages of Natural Gas Desiccant Dehumidification

    Advantages of Natural Gas Desiccant Dehumidification  Saves energy for heating & cooling – don’t have to cool as much in summer or heat as much in winter  Reduces overall operating costs  Reduces conventional cooling requirements – smaller system(s) can be installed  Improves efficiency of chill

  44. Slide 44: Difference between Desiccant Wheels and Liquid Desiccant Systems

    Difference between Desiccant Wheels and Liquid Desiccant Systems Provides Residential warm through dry air industrial sizes Provides Typically large cool commercial and dry air industrial sizes © 2012 Energy Solutions Center Inc. All Rights Reserved 44

  45. Slide 45: Natural Gas Humidifiers

    Natural Gas Humidifiers  Natural Gas Humidification  Natural gas humidifiers add moisture to dry air  Natural gas burners boil water to steam and deliver humidity via air handler or blower  Minimizes steam pressure  Eliminates boiler chemicals  Can be used in conjunction with existing boiler G

  46. Slide 46: Steam Humidifier

    Steam Humidifier 1. Stainless steel boiler 2. Aluminum heat exchanger 3. Clean-out cover 4. High level foam probes 5. Forced draft gas burner 6. Gas inlet 7. Flue temperature sensor 8. HumiControl 9. 10. 11. Water inlet assembly 12. Fill cup - conductivity probes 13. Boiler overflows 14. Triple floa

  47. Slide 47: Humidification – How It Works

    Humidification – How It Works  Humidifier generates steam  Gas burner fires into heat exchanger  Heat exchanger submerged in tank of water  Water heated to steam which is distributed via air handling system or remote blower Steam Distributor Pipe Remote Blower System © 2012 Energy Solutions Cent

  48. Slide 48: Advantages of Humidification

    Advantages of Humidification  Ensures more precise temperature and humidity control  Reduces incidence of asthma, allergy and related respiratory illnesses brought on by dry air  Contributes to health and comfort of building occupants  Reduces employee absenteeism due to illness and increases em

  49. Slide 49: Advantages of Humidification

    Advantages of Humidification  Protects expensive equipment, furnishings and supplies  Eliminates static electricity  Reduces energy costs  Cost-effective alternative where no boiler exists © 2012 Energy Solutions Center Inc. All Rights Reserved

  50. Slide 50: Manufacturers

    Manufacturers  Numerous manufacturers exist for each humidity control technology  Listed on the following slides are some of the major manufactures by technology type © 2012 Energy Solutions Center Inc. All Rights Reserved 50

  51. Slide 51: Dry Wheel Desiccant Systems

    Dry Wheel Desiccant Systems  Bry-Air – www.bry-air.com  Concepts and Designs – www.cdihvac.com  Munters – www.munters.com  Novelaire – www.novelaire.com  Seasons4 – www.seasons4.net  SEMCO – www.semcohvac.com  Stultz-ATS – www.stultz-ats.com © 2012 Energy Solutions Center Inc. All Rights Rese

  52. Slide 52: Liquid Desiccant Systems

    Liquid Desiccant Systems  Advantix Systems – www.advantixsystems.com  AIL Research Inc. – www.ailr.com  Kathabar Dehumidification Systems (KDS) - a Division of Niagara Blower – www.kathabar.com © 2012 Energy Solutions Center Inc. All Rights Reserved 52

  53. Slide 53: Humidifiers

    Humidifiers  Armstrong – www.armstronginternational.com  Dri-Steem – www.dristeem.com  Carel USA – www.carelusa.com  Nortec – www.humidity.com  Pure Humidifier – www.purehumidifier.com © 2012 Energy Solutions Center Inc. All Rights Reserved 53

  54. Slide 54: Other Resource www.gasairconditioning.com

    Other Resource www.gasairconditioning.com © 2012 Energy Solutions Center Inc. All Rights Reserved 54

  55. Slide 55: Questions ?

    CenterPoint Energy contacts: MN: Business customers: 612-321-4330 (800-234-5800, ext. 4330) Trade Allies: David Poretti 612-321-4386 AK: Lance Orton 501-377-4548 OK: Robin Slater 580-250-5426 Questions ? TX: Calvin Roberts 713-207-8452 MS and LA: Jim Tilley 318-429-4257

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