objectives
Download
Skip this Video
Download Presentation
Objectives

Loading in 2 Seconds...

play fullscreen
1 / 22

Objectives - PowerPoint PPT Presentation


  • 105 Views
  • Uploaded on

Objectives. Propose topics for the final project Learn about VAV systems. Project. Design problem …. Research problem …. Enthalpy wheel . Couple chiller and cooling tower. Cooling tower. T CTS. T CTR. Weather parameters. P. - Find COP for several weather condition .

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Objectives' - stephanie


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
objectives
Objectives
  • Propose topics for the final project
  • Learn about VAV systems
project
Project
  • Design problem
    • ….
  • Research problem
    • ….
couple chiller and cooling tower
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

hvac control
HVAC Control

Economizer (fresh air volume flow rate control)

fresh

air

damper

filter

cooling

coil

heating

coil

filter

steam

humidifier

fan

mixing

sequence of operation ecj research facility

Mixture 3

DPTSP

Set Point (SP)

Mixture 2

Mixture 1

DBTSP

Sequence of operation(ECJ research facility)

Control logic:

Mixture in zone 1: IF (( TM<TSP) & (DPTM<DPTSP) ) heating and humidifying

Heater control: IF (TSP>TRA) increase heating or IF (TSP<TRA) decrease heating

Humidifier: IF (DPTSP>DPTRA) increase humidifying or IF (DPTSP<DPTRA) decrease humid.

Mixture in zone 2: IF ((TM>TSP) & (DPTM<DPTSP) ) cooling and humidifying

Cool. coil cont.: IF (TSP<TRA) increase cooling or IF (TSP>TRA) decrease cooling

Humidifier: IF (DPTSP>DPTRA) increase humidifying or IF (DPTSP<DPTRA) decrease hum.

Mixture in zone 3: IF ((DPTM>DPTSP) ) cooling/dehumidifying and reheatin

Cool. coil cont.: IF (DPTSP<DPTRA) increase cooling or IF (DPTSP>DPTRA) decrease cooling

Heater control: IF (TSP>TRA) increase heating or IF (TSP<TRA) decrease heating

slide7

Fan

Biomedical Engineering (BME) Building

Duct Optimization

Ducts

Supply

Return

In-Take air

Exhaust

life cycle cost analysis
Life Cycle Cost Analysis
  • Engineering economics

Option A

Option B

vav example
VAV Example
  • One system
  • Multiple Spaces/Zones

- VAV box for each space/zone

  • http://www.trane.com/commercial/library/vol242/v24b6.asp
vav system terms equations you can find them in ashrae standard 62
VAV System Terms & Equations(you can find them in ASHRAE Standard 62)
  • Fraction of minimum outdoor air in space/zone supply air

Xi = VOAi / VSAi

  • Critical space

Space with maximumXi , Z=max(Xi)

  • Fraction of outdoor air in system supply air

X = sum(VOA ) / sum(VSA)

  • Required Fraction of outdoor air:

Y=X/(1+X-Z)

other issues related to vav
Other Issues Related to VAV
  • Fan control
  • Minimum supply air
  • Occupancy sensors
doas system
DOAS System
  • www.doas.psu.edu
project1
Project

Commercial building

  • Zone orientation
project2
Project
  • Cooling and heating load for each zone and whole building:
  • Fresh air requirement based on number of occupants:
  • To provide acceptable IAQ in the building, ventilation
  • system supply minimal amount of
  • fresh air is in all spaces (except plenums)
  • that produce 0.2 ACH.
cooling load calculation
Cooling load calculation
  • Mostly computer based
  • Handouts for manual calculation
    • http://www.ce.utexas.edu/prof/Novoselac/classes/ARE346N/Handouts/heatloss_table_2008.doc
    • http://www.ce.utexas.edu/prof/Novoselac/classes/ARE346N/Handouts/ASHRAE_%20Gains_Calculation_Tables.doc
  • The most important issues
ad