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Next Class: Text

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. Objectives. Finish with Ducts design Example Review for the Exam Answer your. Frictional Losses. Non-circular Ducts.

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Next Class: Text

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  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

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