Objectives
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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 .

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Objectives

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Objectives

Objectives

  • Propose topics for the final project

  • Learn about VAV systems


Project

Project

  • Design problem

    • ….

  • Research problem

    • ….


Enthalpy wheel

Enthalpy wheel


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


Objectives

Fan

Biomedical Engineering (BME) Building

Duct Optimization

Ducts

Supply

Return

In-Take air

Exhaust


Objectives

  • 3D model – Biomedical Engineering (BME) Building


Objectives

  • 3D model – Biomedical Engineering (BME) Building


Objectives

  • 3D model – Biomedical Engineering (BME) Building


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)


Example solution

Example Solution


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


Doas with multi split systems

DOAS with multi-split systems

Fresh air?


Doas fresh air configurations

DOAS fresh air configurations


Doas fresh air configurations1

DOAS fresh air configurations


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


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