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Objectives

Objectives. Discus final project Load calculation. Final Project. Group 5: Nick Williams Stephen Mathai Kevin Carbonnier Group 6: Marcus Allen Josh Atkins Matt Larson Group 7: Stephen Fridley Shahrukh Gaziani Margaret Lawson. Group 8: Marwa Zaatari Megan Gunther Elena Nirlo

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Objectives

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  1. Objectives • Discus final project • Load calculation

  2. Final Project Group 5: Nick WilliamsStephen Mathai Kevin Carbonnier Group 6: Marcus Allen Josh Atkins Matt Larson Group 7: Stephen Fridley Shahrukh Gaziani Margaret Lawson Group 8: Marwa Zaatari Megan Gunther Elena Nirlo Group 9: Gregory Arcangeli Andrew Hoisington Adam Keeling Individual projects Neil Woodson Wesley Cole Sami Kolahdoozan Gautam Salhotra Group 1: Heather SmithTommy BealesMatt Leos Group 2: Patrick Gorman Kenny Greaves Matt McCarthy Group 3: Sarah Johnson Jocelyn Citty Tobias Nilsson Group 4: ZaidArzate Brian Burcham Justin Barrett

  3. Project topics 1) VAV system design • Fresh air requirements and recirculation rate calculation • Selection of zonal and central HVAC components based on cooling and heating load components • For zones: VAV boxes, reheaters, reheater plumbing • For whole system: AHU and components, chiller & cooling tower, boiler, and electric power requirement • Control description – sequence of operation • Heat recovery system and or economizers 2) DOAS system design • Fresh air requirement and split between air and hydronic loads (sensible and latent cooling loads) • Selection of zonal and central HVAC components based on cooling and heating load components • For zones: fan coils and plumbing • For whole system: AHU and components, chiller & cooling tower, boiler, and electric power requirement • Control description – sequence of operation • Heat recovery system and or economizers

  4. Project topics 3) Cooling systems and distribution • Air cooled condenser vs. water cooled condenser (energy performance analysis) • Design of plumbing systems for campus and pumping stations • Control of centralized system • Saving with variable speed pumps 4) Duct Design (in Revit) • - Diffuser selection, design of local and central duct system components • - Spacing issues and difference between round and square ducts • - Difference between manual calculation and calculation by Revit (for a section of the duct system) • - Balancing and fan selection • - Life cycle analysis and optimization (fan power consumption vs. system cost)

  5. DOAS with multi-split systems Fresh air?

  6. DOAS fresh air configurations

  7. DOAS fresh air configurations

  8. Cooling and Heating Loads (For Project) Commercial building • Zone orientation

  9. Cooling and Heating Loads (For 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.

  10. 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

  11. Heat Recovery Sensible and Enthalpy wheel

  12. Economizer Economizer (fresh air volume flow rate control) • Controlled device is damper • - Damper for the air • - Valve for the liquids • fresh • air • damper • mixing • recirc. • air • T & RH sensors

  13. Economizer – cooling regime How to control the fresh air volume flow rate? • If TOA < Tset-point → Supply more fresh air than the minimum required • The question is how much? • Open the damper for the fresh air • and compare the Troom with the Tset-point . • Open till you get the Troom = Tset-point • If you have 100% fresh air and your • still need cooling use cooling coil. • What are the priorities: • - Control the dampers and then the cooling coils or • - Control the valves of cooling coil and then the dampers ? • Defend by SEQUENCE OF OERATION • the set of operation which HVAC designer provides to the automatic control engineer • % fresh air • 100% • Minimum for • ventilation

  14. Economizer – cooling regime • Example of SEQUENCE OF OERATIONS: • If TOA < Tset-point open the fresh air damper the maximum position • Then, if Tindoor air < Tset-point start closing the cooling coil valve • If cooling coil valve is closed and T indoor air < Tset-point start closing the damper • till you get T indoor air = T set-point • Other variations are possible

  15. Figure 3 – A desiccant-based cooling system combined with regenerative heat exchanger, vapor compression cooling, and evaporative humidifier (hybrid system). Desiccant wheel

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