1 / 19

Comprehensive Review Session for Duct Design and Psychrometrics

Join us for an in-depth 1.5-hour long class focusing on duct design and psychrometric processes. We will cover key objectives, including frictional losses in non-circular ducts, fan selection, energy equations, and thermal conductivity effects. Additionally, discussions will include the significance and functioning of cooling towers, the Carnot cycle, heat exchanger calculations, and duct layout design. Bring your open books and notes, and prepare to address exam-related questions, gain insights into thermal systems, and enhance your problem-solving skills for HVAC applications.

gaye
Télécharger la présentation

Comprehensive Review Session for Duct Design and Psychrometrics

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Next Class: Text 1.5 hour long Bee in class at 12:20 pm Open book, open notes - Comprehensive Next week (Monday at 10-12) extra office hours related to the Test

  2. Objectives • Finish with Ducts design • Example • Review for the Exam • Answer your

  3. Frictional Losses

  4. Non-circular Ducts • Parallel concept to wetted perimeter

  5. Dynamic losses • Losses associated with • Changes in velocity • Obstructions • Bends • Fittings and transitions • Two methods • Equivalent length and loss coefficients

  6. Loss Coefficients • ΔPt = CoPv,0

  7. Electrical Resistance Analogy

  8. Example 18.7 • Determine total pressure drop from 0 to 4

  9. Fan selection • Calculated DP and V

  10. Fan Performance

  11. Conversion Between Methods Se Example 18.8 and compare with 18.7

  12. Review for the Exam • Should be able to do all calculations associated with lectures as well as HWs • Problems may deal with context • i.e. Explain how thermal conductivity influences fin efficiency? Holding all other parameters equal, how important is increasing the thermal conductivity

  13. Psychrometrics and Processes (7 & 8) • Know all parameters and their location/orientation on a psychrometric chart • Be able to look up conversions of parameters on a psychrometric chart and with calculations • Use protractor to calculate SHR and ΔW/Δh • Plot processes on a chart for real buildings • List what is held constant for different processes • Describe processes in AHUs in psychrometric chat

  14. Direct Contact (10) • Purpose of cooling towers • Psychrometrics • Describe how a cooling tower works

  15. Cycles (3), Refrigerants (4) • Describe Carnot cycle and components • Understand constant variables for each component • List, describe, and calculate inefficiencies • Use figures, refrigerant tables and equations for different substances • List important parameters for refrigerant selection/differentiation

  16. Heat Exchangers (11) • Differentiate types • Calculate ε, and UA, etc. • Complete broad analysis • Which m is larger, which Δt is larger? • Within and between heat exchangers

  17. Heat Exchangers (11) • Calculate and compare different thermal resistances • Describe influence of key factors • Integrate different parameters/resistances • Manipulate UA equation • Describe differences for wet and dry heat exchangers

  18. Diffusers, Duct Components (18) • Select diffusers • Define all terms on manufacturer data sheets • Calculate pressure drop of: • Straight duct • Duct fittings • Differentiate fans and describe fan curves

  19. Duct layout/design (18) • Equal friction method • Supply or return systems • Balance the system

More Related