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FUNdamentals of Cocktailmetrics...

Prof. Koldenhott’s. FUNdamentals of Cocktailmetrics. Prof. Koldenhott says, “This is a lesson of air and water vapor in a cocktail (that is, a mixture) with apologies to Mr. Willis Carrier.”. Your instructor. Mr. Terry L. Robinson. aka. N.A.T.E. certified. Active Member.

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FUNdamentals of Cocktailmetrics...

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  1. Prof. Koldenhott’s FUNdamentals of Cocktailmetrics... Prof. Koldenhott says, “This is a lesson of air and water vapor in a cocktail (that is, a mixture) with apologies to Mr. Willis Carrier.” Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  2. Your instructor... Mr. Terry L. Robinson aka N.A.T.E. certified Active Member Member of Council of Refrigeration and Air Conditioning Educators Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  3. Cocktailmetrics aka Psychrometrics Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  4. In the early 1900’s, there was a young engineer Working For Buffalo Forge Company that received a 'flash of genius' while waiting for a train. It was a foggy night and he was going over in his mind the problem of temperature and humidity control. By the time the train arrived, Carrier had an understanding of the relationship between temperature, humidity and dew point. That young engineer was… …Willis H. Carrier from The Father of Cool Willis Haviland Carrier: The History of Air Conditioning by Mary Bellis on www.about.com Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  5. What Mr. Carrier’s 'flash of genius' that day came to be known as Psychrometry... …the study of air and watervapor in mixture. “It’s this ‘mixture’ idea that leads me to nick- name Psychrometrics, Cocktailmetrics.” says Prof. Koldenhott Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  6. Psychrometric Chart... …graphically shows the Properties of Air. Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  7. Psychrometric Chart used... …to modelconditions inside buildings by system designers. Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  8. Psychrometric Chart used... …to monitorconditions in commercial refrigeration plants and manufacturing environments. Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  9. Psychrometric Chart used... …to evaluateproblems in air conditioned environments. Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  10. Structure… H E E L INSTEP INSTEP SOLE Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  11. Seven Properties of Air 7 2 5 4 3 6 1 Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  12. Seven Properties of Air... 1.Prof. Koldenhott’s Dry Noodle Temp better known asDry Bulb Temperature …taken with a standardthermometer. 0F SOLE 800 F DB Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  13. Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  14. Seven Properties of Air... 2. Prof. Koldenhott’s Wet Noodle Temp better known asWetBulbTemperature …taken with a thermometer with a wettedwick. 660 FWB Instep SLING PSYCHROMETER Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  15. Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  16. Seven Properties of Air... 3. Prof. Koldenhott’s Wet Spot Temp better known as Dew Point Temperature …temperatue at which moisture condenses on a surface. Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  17. Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  18. Seven Properties of Air... 4.SpecificHumidity (aka AbsoluteHumidity or HumidityRatio) …amount of water vapor in dry air. Measured in grainsperpound of dry air. 77 gr/lb Heel Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  19. Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  20. Seven Properties of Air... 5. RelativeHumidity …the amount of moisture vapor the air is holding compared to what it could hold at the same DB temperature. Curved Lines Saturation Point Curve = 100% RH Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  21. Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  22. Seven Properties of Air... 6. SpecificVolume - Space that one pound of dry air takes up - Steeply slanted lines - Expressed in Cubic Feet per Pound ( ft3/lb ) Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  23. Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  24. Seven Properties of Air... 7. Enthalpy - Total amount of heat energy (sensible and latent) in one pound of air. Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  25. Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  26. PSYCHROMETRIC ASSIGNMENT • Prof. Koldenhott suggests that you do the following Assignment: • Print multiple copies of the next slide (Psychrometric Chart.) • Using a Sling Psychrometer, record Outdoor Conditions and Indoor Conditions. (Note: Instruction on how to construct a sling psychrometer follows the next slide.) • Plot the Outdoor conditions (DB and WB) on one Psychrometric Chart. • Plot the Indoor conditions (DB and WB) on one Psychrometric Chart. • Draw the lines necessary to find all other Properties of air Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  27. DB TEMP:_______ NOTE: USE PROPER UNITS. WB TEMP:______ DP TEMP:______ W:_________ RH:________ V:_________ H:_________ Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  28. Making a Sling Psychrometer for reading WB: Need: 1 ea. Athletic Shoe Lace Cut Shoe Lace X Poke Pocket Thermometer into long piece of Shoe Lace To use: Wet short end and sling while holding on to long end. Short piece taped or rubber-banded to Thermometer Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  29. Air Conditioning Processes Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  30. Air Conditioning Processes... Transition EvapCoil Blower Section Supply Air Plenum Return Air Plenum Heat Section Psychrometric changes take place between RA and SA SA RA Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  31. Heating only Sensible change Process Line moves horizonally to right 0DGR Initial Point (Return Air reading) DT Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  32. Cooling only Sensible change Process Line moves horizonally to left 0DGR DT Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  33. Humidifying only Process Line moves straight up DGR Latent change 0DT Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  34. Dehumidifying only Process Line moves straight down Latent change DGR 0DT Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  35. Other AC Processes... Sensible and Latent change Heating & Humidifying Cooling & Humidifying Cooling & Dehumidifying Heating & Dehumidifying Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  36. What we need for evaluating AC Processes... DH RA 50% RH Process Line DGR SA 80% RH 800 F DB 600 F DB DT Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  37. Air Side Equations Sensible Load: Qs = 1.1 X CFM X DT A constant based on the Density of Air and a time conversion factor Determined from the Condensing Unit model number QS is expressed in BTUH Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  38. Air Side Equations Latent Load: QL = .68 X CFM X DGR A constant… including a time conversion factor Same as that used for QS QL is expressed in BTUH Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  39. Air Side Equations Total Load: QT = 4.45 X CFM X DH A constant… including a time conversion factor Same as that used for QS QT is expressed in BTUH Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  40. PSYCHROMETRIC PROCESSES ASSIGNMENT • Prof. Koldenhott suggests that you do the following Assignment: • Using a Sling Psychrometer, record Return Air Condition and Supply Air Condition of an actual Air Conditioning Process (suggest Cooling and Dehumidification for best results.) Determine CFM from Model # of Outdoor Unit. Plot the RA and SA on the chart. • Draw the Process Line. What type of Psychrometric Process?______________________________ • Determine DT:______, DGR:______DH:_______ • Calculate: • a. QS:________________ • b. QL:________________ • c. QT:________________ Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  41. Sensible Heat Ratio Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  42. Sensible Heat Ratio… LATENT SENSIBLE …the ratio of Sensible Load (QS) to Total Load (QT) Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  43. Sensible Heat Ratio… SHR = QS QT Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  44. Sensible Heat Ratio… Example: 29,060 btuh = SHR = 36,325 btuh .80 SHR Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  45. Sensible Heat Ratio… The way Engineers Plot SHR on the Psychrometric Chart Permanent Index Point .80 SHR . Note: Any Process Line parallel to this line will maintain the SHR Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  46. SENSIBLE HEAT RATIO ASSIGNMENT • Prof. Koldenhott suggests that you do the following Assignment: • Calculate Actual Sensible Heat Ratio for the previous assignment. Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  47. Sensible & Latent Changes in Enthalpy Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  48. …Latent change in Enthalpy HL Hs …Sensible change in Enthalpy DGR Latent change… DT Sensible change… Prof. Koldenhott's FUNdamentals of Cocktailmetrics

  49. If you’ve gone through the entire presentation, I appreciate your effort. Please let me know what you think. Email:profkoldenhott@tx.rr.com or write: Prof. Koldenhott 2787 Sun Valley Dr. Grand Prairie, Texas 75052 Prof. Koldenhott's FUNdamentals of Cocktailmetrics

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