1. 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

5. 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

6. Hydronic Terms
Head loss
Open-loop vs. closed loop

7. Head Loss

8. Fittings

9. 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

12. Plumbing Arrangements

16. Project
Design problem ….
Research problem

17. Couple chiller and 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
damper
filter
cooling
coil
heating
coil
filter
steam
humidifier
fan
mixing

19. Sequence of operation (ECJ research facility)
Set Point (SP)
Mixture 2
Mixture 3
Mixture 1
DBTSP
DPTSP
Control logic:
Mixture in zone 1: IF (( TM<TSP) & (DPTM<DPTSP) ) heating and humidifying
Heater control: IF (TSP>TSA) increase heating or IF (TSP<TSA) decrease heating
Humidifier: IF (DPTSP>DPTSA) increase humidifying or IF (DPTSP<DPTSA) decrease humid.
Mixture in zone 2: IF ((TM>TSP) & (DPTM<DPTSP) ) cooling and humidifying
Cool. coil cont.: IF (TSP<TSA) increase cooling or IF (TSP>TSA) decrease cooling
Humidifier: IF (DPTSP>DPTSA) increase humidifying or IF (DPTSP<DPTSA) decrease hum.
Mixture in zone 3: IF ((DPTM>DPTSP) ) cooling/dehumidifying and reheatin
Cool. coil cont.: IF (DPTSP>DPTSA) increase cooling or IF (DPTSP<DPTSA) decrease cooling

20. Duct Optimization Biomedical Engineering (BME) Building Fan Ducts
Supply
Return
In-Take air
Exhaust

21. Life Cycle Cost Analysis
Engineering economics
Option A
Option B

22. Enthalpy wheel

23. VAV Example One system Multiple Spaces/Zones
- VAV box for each space/zone