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Objectives

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Objectives AHU processes - HW2 Cooling cycles Air conditioning Single-Zone Systems Zone any space with a thermostat Recirculation Reheat Evaporative Cooler Air-to ... – PowerPoint PPT presentation

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Title: Objectives


1
Objectives
  • AHU processes
  • - HW2
  • Cooling cycles

2
Air conditioning
3
Single-Zone Systems
  • Zone any space with a thermostat

4
Recirculation
5
Reheat
6
Evaporative Cooler
7
Air-to-air heat exchanger
8
(No Transcript)
9
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10
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11
Vapor Compression Cycle
Expansion Valve
12
(No Transcript)
13
Efficiency
  • First Law
  • Coefficient of performance, COP
  • COP useful refrigerating effect/net energy
    supplied
  • COP qr/wnet
  • Second law
  • Refrigerating efficiency, ?R
  • ?R COP/COPrev
  • Comparison to ideal reversible cycle

14
Carnot Cycle
  • No cycle can have a higher COP
  • All reversible cycles operating at the same
    temperatures (T0, TR) will have the same COP
  • For constant temp processes
  • dq Tds
  • COP TR/(T0 TR)

15
Get Real
  • Assume no heat transfer or potential or kinetic
    energy transfer in expansion valve
  • COP (h3-h2)/(h4-h3)
  • Compressor displacement mv3
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