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Psychrometrics Made Simple

Join CaptiveAire for a professional development hour (PDH) all about psychrometrics and the Psychrometric Chart--how it came to be, how it's used, and why it's important in HVAC design. This topic is particularly helpful for anyone who works in HVAC, especially HVAC engineers and consultants, or anyone who wants to gain a deeper understanding of the world around us. Learn more about CaptiveAire at captiveaire.com. To receive PDH certification for this video, please visit CaptiveAire.com/library and click Request Access under the Professional Development section. Fill out the form on the pop up that appears and click Send. CaptiveAire will then add you to a professional development portal where you can access a certificate to confirm your training. 0:00 Introduction 0:37 A very brief history of the psychrometric chart 2:15 Part 1 - The Fundamentals 3:08 Dry bulb vs wet bulb temperatures 5:47 Relative humidity 9:40 Dewpoint 11:30 Moisture content 13:06 Enthalpy 15:56 Specific volume 17:22 Finding all parameters example 18:53 Part 2 - Mapping HVAC Processes 19:06 Basic directions on the chart 21:25 Evaporative cooling and the adiabatic process 22:16 The comfort zone 22:43 The cooling process 25:05 Internal heat gains and the sensible heat ratio (SHR) 27:10 The heating process 28:36 Part 3 - Sizing HVAC Equipment 29:42 Sizing Example 1 - A simple enthalpy calculation 31:52 Sizing Example 2 - Peak dry bulb vs. dehumidification conditions 35:22 Other factors influencing equipment sizing 37:55 Part 4 - Modulation, Gas Reheat, and Economizers 37:58 Modulation 40:22 Reheat 43:13 Economizers 46:20 Conclusion