Introduction to VRF
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The document provides an overview of Variable Refrigerant Flow (VRF) technology, highlighting its components, features, and applications in HVAC systems. John Chavez, a mechanical contractor with extensive experience, discusses the efficiency and design flexibility of VRF systems compared to traditional HVAC solutions. It emphasizes benefits such as energy efficiency, personalized control, and reduced maintenance requirements.
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Introduction to VRF
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- 2. 2 John Chavez! Gunder & Associates, LLC! SELLING AND APPLYING VRF TECHNOLOGY
- 3. Began my career in 1986! About me 24 years as a Mechanical Contractor! NATE Certified! Mini-Split Experience since 1995! VRF Experience since 2007! Currently: Technical Sales and Support!
- 4. My Customers are:! End Users and Building Owners Contractors Distributors Mechanical Engineers Architects Factory Sales Personnel About me
- 5. 5 Todays Topics ! ! !1. What is VRF Technology?! ! ! !2. What are the Key System Features?! ! ! !3. How Do VRF Systems Work?! ! ! !4. Review of System Components! ! ! !5. Applications and Design! ! ! !6. Service and Maintenance!
- 6. 6 Introduction to VRF? VARIABLE REFRIGERANT FLOW
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- 9. 9 not your typical heat pump!
- 11. 11 First Installation was 32 Years Ago! >Two Million Installations! World Wide!
- 12. 12 Chapter 18. Variable Refrigerant Flow Proven Technology
- 13. Mitsubishi Electric! LG Electronics! Daikin! Panasonic/Sanyo! Fujitsu! Hitachi! Carrier/Toshiba! 13 Samsung! EMI/Enviromaster! Midea! Gree! MHI! Sharp! about 10 more….! The PLAYERS
- 14. Mitsubishi Electric! LG Electronics! Daikin! Panasonic/Sanyo! Fujitsu! Hitachi! Carrier/Toshiba! 14 Samsung! EMI/Enviromaster! Midea! Gree! MHI! Sharp! about 10 more….! The PLAYERS
- 15. Mitsubishi Electric! LG Electronics! Daikin! Panasonic/Sanyo! Fujitsu! Hitachi! Carrier/Toshiba! 15 Samsung! EMI/Enviromaster! Midea! Gree! MHI! Sharp! about 10 more….! The PLAYERS
- 16. 16 What is VRF? A system of singular or modular heat pumps ! and indoor fan coils that are connected ! by a common system control and ! a common set of refrigerant piping.! !
- 17. 17 What is VRF? A system of singular or modular heat pumps ! and indoor fan coils that are connected ! by a common system control and ! a common set of refrigerant piping.! !
- 18. 18 What is VRF? A system of singular or modular heat pumps ! and indoor fan coils that are connected ! by a common system control and ! a common set of refrigerant piping.! !
- 19. 19 The refrigerant is passed through a series of ! fan coils by means of variable speed compressors and metered by an ! electronic expansion valve (EEV) that ! regulates refrigerant flow to ! accommodate the comfort set point ! for individual fan coils and zones! What is VRF?
- 20. 20 ! The variable speed compressor increases! or decreases the system capacity to ! satisfy the individual load requirements! What is VRF?
- 21. 21 ! The variable speed compressor increases! or decreases the system capacity to ! satisfy the individual load requirements! What is VRF? Personalized zoned comfort control
- 22. 22 ! The software programming in the outdoor unit continually scans about 250 data points to! meet specific tolerances in target temperatures and pressures.! What is VRF? the software is a conductor in a sophisticated symphony
- 23. 23 Heat Pump vs. Heat Pump with Heat Recovery
- 24. 24 Heat Pump vs. Heat Pump with Heat Recovery
- 25. 25 Heat Pump
- 26. 26 Heat Pump
- 27. 27 Heat Pump
- 28. 28 Heat Recovery Simultaneous Heating and Cooling
- 29. 29 Simultaneous Heating and Cooling Heat Recovery
- 30. 30 Simultaneous Heating and Cooling Heat Recovery
- 31. 31 Common Network Refrigerant Circuit and Control Communication Buss
- 32. 32 What are the Key Features?
- 33. 33 Mix and Match Indoor Units! Inverter Driven Scroll Compressors! Up to 150% Connected Capacity!
- 34. 34 Flexibility in Design! Zoned Space Control! Simultaneous Heating and Cooling!
- 35. 35 Two or Three Pipe System! Two Wire DDC Network! Integrated Controls Network! BACnet and LonWorks!
- 38. 38 Flexible Piping Design 3280 FT 295 FT 49 FT 295 FT 540 FT
- 39. 39 8 inches Tall
- 40. 80 Tons Economy of Scale
- 41. Economy of Scale Fits into a Six Person Elevator
- 42. Air 30” Diameter Ductwork Water 2 1/2” Iron Pipe 2” Iron Pipe Refrigerant R410A 1 1/8” Copper Pipe Space required to deliver 20 tons of cooling Economy of Scale
- 43. Air .3 Watts/kg Water 5.8 Watts/kg Refrigerant R410A 57 Watts/kg Economy of Scale
- 44. Air .3 Watts/kg Water 5.8 Watts/kg Refrigerant R410A 57 Watts/kg Economy of Scale Transporting expensively generated conditioned air Is probably not the best method to heat and cool a building Refrigerant has 10x the heat transfer capacity of chilled water and 190x that of air
- 45. Ceiling Space Economy of Scale
- 47. Low Sound Rating VRF Heat Pump VRF Indoor Units
- 48. 48 System Automatically Matches the Zone Load Adjusts the Flow of Refrigerant and Energy Adjusts the Compressor Speed and Fan Speed Improves Temperature Control Energy Efficient
- 49. 49 off the charts energy efficiency when in part load conditions Inverter driven compressor matches compressor speed to meet the full or part load demand soft starts no lock rotor amps
- 50. 50 allows for precise temperature and humidity control
- 51. Room Temperature Set Point 75F 60Hz Compressor 0Hz 150Hz 30Hz Room temperature is steady. High rotation speed up to 120Hz Keeps rotation speed low after temperature stabilizes. adjusts rotation speed precisely keeps steady space temperature 80F ON Very Efficient Comfortable!Very fast! Load Matching Refrigerant Flow “soft start” Low Current at start
- 55. Total Building First Costs
- 56. Typical HVAC Efficiency Ratings rating systems are based at part load capacity • IEER – Integrated Energy Efficiency Rating = Took the place of IPLV, is used for VRF product, and is explained in detail on the next slide • SCHE – Simultaneous Cooling & Heating Efficiency = the efficiency of VRF Heat Recovery at simultaneous 50% heating & 50% cooling
- 57. Schematic Design Phase System Benefits Federal Guidelines-AHRI Standard 1230 !Establishes Testing Procedures" " " " ! " " !VRF Efficiency Database " " " ! " " !Part-Load Efficiencies" " " ! " "
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- 59. 59 If installed correctly,! VRF systems are bullet proof.! ! -Large Texas Based Commercial Contractor! “ ” .05% (Five Hundredths of One Percent) Warranty Return Reliability
- 60. Lower Life Cycle
- 61. Lower Life Cycle the cost of an hvac system is about more than the cost of design, equipment and installation. you need to consider operation, service, maintenance and replacement in the total cost equation. VRF zoning systems are more efficient, easier to design, takes less time to install and require significantly less maintenance than conventional hvac systems.
- 62. 62 How Do VRF Systems Work?
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- 65. LEV Coil Inet Coil Outlet Constantly monitoring to keep a target Superheat or Subcooling Temperature Return Air Stream Sensor SMART COIL or Room Space Sensor
- 66. LEV Coil Inlet Coil Outlet Constantly monitoring to keep a TARGET Superheat or Subcooling Temperature Return Air Stream Sensor or Room Space Sensor SMART COIL
- 67. SMART COIL
- 68. 68 2000 Steps
- 70. 70 Two vs Three Pipe Heat Recovery Systems Inverter+Fixed or Inverter Only Service Access to Components Controls Network Piping Rules Programming Logic DIFFERENCES IN VRF SYSTEMS
- 71. Capacities at Low Ambient Conditions Defrost Strategy Oil Management Customer Support/Training Service Software Tools Selection Software Tools Information Available to the Public DIFFERENCES IN VRF SYSTEMS
- 72. 72 Review of System Components Air and Water Source Heat Pumps DOAS ERV Indoor Fan Coils Zone Control Central Control
- 73. 73 Air and Water Source Heat Pumps 94 Models
- 74. 74 Heat Recovery ! Heat Pump with Branch Controller! 6~28 Tons! 208~230, 460 Volt! Inverter Driven Scroll Compressor! Sound Rating as Low as 48 dB’s! Outdoor Units Connect 50:1! Connect up to 150%!
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- 76. LG = Heat Recovery Unit Branch Circuit Controller Daikin = Branch Selector
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- 82. 82 Three Phase Heat Pump! 6~36 Tons! 208~230, 460 Volt! Inverter Driven Scroll Compressor! Sound Rating as Low as 48 dB’s! Connect 50:1! Connect up to 130%! Outdoor Units
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- 84. 84 3,4, & 5 Tons! 208~230 Volt, Single Phase! Inverter Driven Scroll Compressor! Sound Rating as Low as 49 dB! Single Phase Heat Pump! Connect up to 130%! Connect 8:1! Outdoor Units
- 85. 85 Indoor Units 11 Styles and 64 Models
- 86. Space Mounted Units High Wall Mounted Ceiling Suspended Floor Standing (PFFY-NRMU for recessed mounting not shown) CITY MULTI VRF
- 87. Four Way 33x33 Ceiling Cassette Four Way 24x24 Ceiling Cassette One Way Cassette CITY MULTI VRF Ceiling Recessed Cassettes
- 88. Concealed Ducted Units Ceiling Concealed Medium Static Up to .6 In W.C. High Static up to 1 In W.C. Low Profile Up to .2 In W.C. Fan Coil Down/Horizontal Left/ Vertical Ducted Product Review CITY MULTI VRF
- 89. Integrated Digital Control System • 2 Wire DDC System – 16 GA. Stranded & Shielded – Daisy Chain Connection – Non-Polarized • Customizable Control Scheme • Integration into BMS & EMS • Third Party Equipment Control Controls Network
- 90. Controls Network Zone Control Central System Control
- 91. PC-Based Controls Web Browser Functionality Product Review CITY MULTI VRF Controls Network
- 92. CITY MULTI VRF iPhone, iPad, iTouch App Controls Network
- 93. IN P1P2F1 F2 P1P2F1 F2 P1P2F1 F2 P1P2 F1 F2 P1P2 P1P2 Zone 1 Zone 2 Zone 3 Typical Controls Wiring
- 94. System Design Selection Software • Easy to Use • Drag & Drop System Components • Input Project Information • Output Layout and System Design Selection Software
- 95. Document Design Phase System Design AutoCAD Output AutoCAD
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- 106. 106 Reduced Electrical Panel from 5kVA to 2kVA! Dallas, Texas! The Element Hotel! System is Activate by a Key Card!
- 107. 107 Waco, Texas! Roosevelt Tower! 12-Story Luxury Office Building!
- 108. 108 Oklahoma City, OK! SandRidge Energy! 30-Story Office Building!
- 110. Location of CDU 217 ft 167 ft How to overcome higher level difference 384 ft
- 111. CDU on Upper Roof 217 ft 167 ft 1454 Tons
- 112. CDU on Lower Roof 217 ft 167 ft 1259 Tons
- 113. 113 [ Custom Home ]!
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- 116. 116 Just wash or replace the air filters and clean the coils with fresh water. That’s it!! Maintenance
- 117. 117 The number one thing you need when! troubleshooting a VRF or DFS system is…….! Service
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- 122. 122 DC Voltmeter! Selectable! Range up to! 500k Ohm! Ohm-meter!
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- 126. 126 VRF Systems are changing the way we Heat and Cool buildings
- 128. Open Forum 128