1 / 22

Objectives

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 .

stephanie
Télécharger la présentation

Objectives

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Objectives • Propose topics for the final project • Learn about VAV systems

  2. Project • Design problem • …. • Research problem • ….

  3. Enthalpy wheel

  4. 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

  5. HVAC Control Economizer (fresh air volume flow rate control) fresh air damper filter cooling coil heating coil filter steam humidifier fan mixing

  6. 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

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

  8. 3D model – Biomedical Engineering (BME) Building

  9. 3D model – Biomedical Engineering (BME) Building

  10. 3D model – Biomedical Engineering (BME) Building

  11. Life Cycle Cost Analysis • Engineering economics Option A Option B

  12. VAV Example • One system • Multiple Spaces/Zones - VAV box for each space/zone • http://www.trane.com/commercial/library/vol242/v24b6.asp

  13. 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)

  14. Example Solution

  15. Other Issues Related to VAV • Fan control • Minimum supply air • Occupancy sensors

  16. DOAS System • www.doas.psu.edu

  17. DOAS with multi-split systems Fresh air?

  18. DOAS fresh air configurations

  19. DOAS fresh air configurations

  20. Project Commercial building • Zone orientation

  21. 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.

  22. 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

More Related