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Course Exam . Next Thursday (April 15) 7 pm Same classroom (ECJ 7.208) 2.5-hour exam Open book open notes All problem types of questions (short but comprehensive). Objectives. Finish the pumps and plumbing systems Discuss the final project . Pumps and Plumbing .

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course exam
Course Exam
  • Next Thursday (April 15) 7 pm
  • Same classroom (ECJ 7.208)
  • 2.5-hour exam
  • Open book open notes
    • All problem types of questions
      • (short but comprehensive)
objectives
Objectives
  • Finish the pumps and plumbing systems
  • Discuss the final project
pumps and plumbing
Pumps and Plumbing
  • Very similar to fans and ducts
    • Same principles based on fluid dynamics
    • With some specifics
hydronic terms
Hydronic Terms
  • Head loss
  • Open-loop vs. closed loop
  • 2-pipe vs. 4-pipe
table 19 1
Table 19.1
  • Pipe dimensions for standard pipe
pumps
Pumps
  • Driving force to move air water in buildings
  • Raise pressure and produce flow
  • One main type
    • Centrifugal
pump curves
Pump curves
  • NPSHR = Net Positive Suction Head Required
finding volumetric flow
Finding Volumetric Flow
  • Same procedure as for air
  • Intersection of pump curve and system curve
  • How can you control flow?
example 19 7
Example 19.7
  • Similar to equal friction method
  • Calculate head loss for common pieces of system
  • Size pipes to have equal head loss between points 2 and 3
review for the exam
Review for the Exam
  • Should be able to do all calculations associated with lectures as well as HW1
    • Questions/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
psychrometrics and processes 7 8
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
direct contact 10
Direct Contact (10)
  • Describe how a cooling tower works
  • Describe analysis procedure for direct contact devices
cycles 3 refrigerants 4
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
  • Contrast different refrigerants
  • List important parameters for refrigerant selection/differentiation
heat exchangers 11
Heat Exchangers (11)
  • Differentiate types
  • Calculate NTU, ε, cr, R, P, F, m, UA, etc.
  • Complete broad analysis
    • Which m is larger, which Δt is larger?
      • Within and between heat exchangers
heat exchangers 1124
Heat Exchangers (11)
  • Calculate and compare different thermal resistances
  • Describe influence of key factors
  • Integrate different parameters/resistances
  • Manipulate UA equation
  • Describe differences/parameters of relevance for wet heat exchangers
diffusers duct components 18
Diffusers, Duct Components (18)
  • Select diffusers
    • Define all terms on manufacturer data sheets
  • Calculate pressure drop of:
    • Straight duct
    • Duct fittings
    • Components (coils, VAV boxes, dampers, etc.)
  • Differentiate fans and describe fan curves
    • Use fan laws
duct layout design 18
Duct layout/design (18)
  • Describe static regain method
  • Compare to equal friction method
    • Supply or return systems
    • Balance the system
project
Project
  • Design problem
    • For example: Given cooling and heating load design HVAC for the building
  • Research problem
    • Analysis based problem. For example:
      • Find the optimum solution for….
      • Developed control strategy for…
      • Life cycle cost analysis for …
      • ……….
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