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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 .

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Objectives

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  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

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