Скачать с ютуб Commercial Load Calculations for HVAC в хорошем качестве

Commercial Load Calculations for HVAC

Join CaptiveAire for a professional development hour (PDH) and learn the ins and outs of commercial HVAC load calculations--how to determine what tonnage unit you need and all of the factors at play in this decision. This topic is particularly helpful for anyone who works in HVAC, especially HVAC engineers and consultants, as well as building owners and anyone who wants to gain a deeper understanding of the decision making process when sizing commercial ventilation equipment. 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 2:49 Part 1 - The Loads 3:16 Envelope loads 5:38 Using correct weather data 6:39 Thermal swing 8:02 Infiltration vs. positive pressure 9:02 Internal loads 9:52 The forgotten loads 10:18 Daily load distributions 10:59 Ventilation loads 11:33 Ventilation code requirements (ASHRAE 62.1) 11:57 Demand controlled ventilation (DCV) 12:54 Ventilation required by exhaust rates 13:33 Weather impact on ventilation 14:44 Part 2 - The Software 14:53 Why we use software 16:41 Inputting the data 17:29 The software output - A load calculation 19:54 Part 3 - Equipment selection 20:54 Determining discharge temperature 24:41 Nominal vs. real world tonnages 25:56 Modeling equipment for real life applications 28:21 Weather impact on ventilation 30:46 Ventilation impact on airflows 36:14 Confusing “Capacity” 39:17 Part 4 - Sizing philosophies, a holistic approach 39:30 Critical applications 40:32 Kitchen discharge temperature vs. airflow 41:01 Considering other factors 42:44 The risks of oversizing 46:15 Sizing modulating equipment 47:03 Conclusion