Objectives

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Objectives

• Finish duct systems
• Learn about plumbing systems
• Discuss your question relate to HW4
• Introduce some project topics

2
VAV Operation
3
How to use multiple pumps
4
Dampers
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Summary of Air Distribution Systems

• Select diffuser based on ADPI
• Given a layout of duct system
• Calculate total pressure drop
• Deal with non-circular ducts and fitting losses
• Select the fan based on fan and duct curve

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Hydronic Terms

• Head loss
• Open-loop vs. closed loop

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Head Loss
8
Fittings
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Pumps

• Driving force to move air water in buildings
• Raise pressure and produce flow
• One main type
• Centrifugal

10
Pump curves

• NPSHR Net Positive Suction Head Required

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Plumbing Arrangements
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Project

• Design problem
• .
• Research problem
• .

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Couple chiller and cooling tower
Cooling tower
TCTS
TCTR
Weather parameters
P
- Find COP for several weather condition

• Use nonlinear equation
• solution methods

TCWS
TCWR
Q
18
HVAC Control

• Economizer (fresh air volume flow rate control)

fresh air
filter
cooling coil
heating coil
filter
steam humidifier
damper
fan
mixing
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Sequence of operation(ECJ research facility)
Control logic Mixture in zone 1 IF ((
TMltTSP) (DPTMltDPTSP) ) heating and
humidifying Heater control IF (TSPgtTSA)
increase heating or IF (TSPltTSA) decrease
heating Humidifier IF (DPTSPgtDPTSA) increase
humidifying or IF (DPTSPltDPTSA) decrease humid.
Mixture in zone 2 IF ((TMgtTSP)
(DPTMltDPTSP) ) cooling and humidifying Cool.
coil cont. IF (TSPltTSA) increase cooling or IF
(TSPgtTSA) decrease cooling Humidifier IF
(DPTSPgtDPTSA) increase humidifying or IF
(DPTSPltDPTSA) decrease hum. Mixture in zone 3
IF ((DPTMgtDPTSP) ) cooling/dehumidifying and
reheatin Cool. coil cont. IF (DPTSPgtDPTSA)
increase cooling or IF (DPTSPltDPTSA) decrease
cooling Heater control IF (TSPgtTSA) increase
heating or IF (TSPltTSA) decrease heating
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Fan
Biomedical Engineering (BME) Building
Duct Optimization
Ducts
Supply
Return
In-Take air
Exhaust
21
Life Cycle Cost Analysis

• Engineering economics

Option A
Option B
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Enthalpy wheel
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VAV Example

• One system
• Multiple Spaces/Zones
• - VAV box for each space/zone

• http//www.trane.com/commercial/library/vol242/v24
  b6.asp