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HVAC – VRF Concept Design

HVAC – VRF Concept Design. ARCH 3502 Variable Refrigerant Flow. Variable Air Volume (VAV). Page 168. All-Air; Single Duct; VAV. Four Major Components Most Commonly used HVAC in medium & large buildings. Fan Room. Chilled Water Room. Cooling Tower. Boiler Room.

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HVAC – VRF Concept Design

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  1. HVAC – VRF Concept Design ARCH 3502 Variable Refrigerant Flow

  2. Variable Air Volume (VAV) Page 168 • All-Air; Single Duct; VAV. • Four Major Components • Most Commonly used HVAC in medium & large buildings Fan Room Chilled Water Room Cooling Tower Boiler Room

  3. Sizing the Boiler/Chiller Room Page 210 110 mcal/sec (tons) 900 s.f.30’ x 30’ 110s.f.10’ x 11’ College of Architecture, Texas Tech University

  4. Fan Room Location Page 185

  5. Variable Refrigerant Flow http://www.acr-heat-pumps-today.co.uk/Air_Conditioning_and_Refrigeration-ch1/News/216/Zero_Refrigerant_in_Occupied_Spaces_HybridVRF_System_Launched_by_Mitsubishi_Electric/ Branch Controller: • One unit per floor • Cold and Hot lines come from the outdoor unit and go through the Branch Controller then to each individual indoor unit. Advantages: • Efficient Design • Comfort Control: Each room has its own thermostat which allows for one room to be cold and another room to be hot. • Sustainability Outdoor Units: • Range: 3-12 Tons • Maximum Piping Length: 984 FT. • Up to 40 indoor units on one outdoor unit Indoor Units: • Range: 7,500 – 48,000 btu • Types: Ceiling (Concealed), ceiling (Semi-Concealed) and floor or wall (Exposed)

  6. Outdoor Units - Sizing Total =120 Tons Per Floor = 14 Tons

  7. Outdoor Units - Specifications

  8. Branch Controllers - BC OU OU OU OU BC BC BC BC IU IU

  9. Branch Controllers - BC OU OU OU OU BC BC BC BC IU IU

  10. Indoor Units - UI

  11. IU: 4-Way Ceiling Recessed

  12. IU: 1-Way Ceiling Recessed

  13. IU: Ceiling-concealed Ducted

  14. Indoor Units - Zoning

  15. Control Network

  16. Dedicated Outside Air System • Advantages: • Energy Efficient • Maintains Humidity Levels • Quiet • Minimal Ceiling Space Required • System: • Main duct is 8 inches • Tributary ducts are 4 inches • Location: • Needs an exterior wall • The air from the restroom can be used as exhaust air. • Disadvantages: - Maintenance • Cost from design

  17. Dedicated Outside Air System OU BC DOAS IU http://www.homepower.com/articles/home-efficiency/equipment-products/heat-energy-recovery-ventilators DOAS

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