SBS5311 HVACR II

Home | What's New | Schedule | Assignments | Laboratory | Resources | Gallery

Variable refrigerant flow (VRF) systems

1. System Overview

2. Components and Types

3. System Operation

4. Design Issues

[Powerpoint file in PDF format]

---

 Video presentation:

• VRF HVAC Training: http://www.youtube.com/playlist?list=PLWv9VM947MKhs0zPB10LFZlTnmmCh-NAj
  
• HVAC VRF Basics - Variable Refrigerant Flow (7:58) http://www.youtube.com/watch?v=hzFOCuAho_4
  
• HVAC VRF System - Cooling Only (8:07) http://www.youtube.com/watch?v=msU8h6jk_mA
  
• HVAC VRF System - Heat Pump (12:48) http://www.youtube.com/watch?v=6FR6ly83K9A
  
• HVAC VRF System - Heat Recovery (16:04) http://www.youtube.com/watch?v=MAkIKn_faps
  
• HVAC VRF Controls (8:42) http://www.youtube.com/watch?v=YlXQ_0xBPYU
  
• HVAC VRF Change over controls - Heat pumps (6:00) http://www.youtube.com/watch?v=YjA4w6RW9PE
  
• Variable Refrigerant Flow System - VRF System (5:21) http://www.youtube.com/watch?v=Ujv3k59XISo
  
• vrf 2 min neighborhood by Ebcorpo (1:59) http://www.youtube.com/watch?v=_XF0XefAyz8

Further reading:

• HVAC Variable Refrigerant Flow Systems http://www.seedengr.com/Variable%20Refrigerant%20Flow%20Systems.pdf
  
• Back to basics: VRF systems http://www.csemag.com/single-article/back-to-basics-vrf-systems/
• Typical VRF system design process:
• Perform a load-profile analysis
• System type selection, zoning and potential for heat recovery
• Accurately size outdoor and indoor units
• Selecting indoor units
• Ventilation air strategy (e.g. dedicated outdoor air system)
  
• Refrigerant piping
  

References:

• ASHRAE, 2016. ASHRAE Handbook HVAC Systems and Equipment 2016, SI edition, American Society of Heating, Refrigerating and Air-Conditioning Engineers Inc., Atlanta, GA. [VTC CIS] [ASHRAE Catalog: 697 A82 T4][TH 7015 .A74]
• Chapter 18 – Variable Refrigerant Flow

 Web links:

• Variable refrigerant flow (VRF) http://www.seventhwave.org/new-technologies/variable-refrigerant-flow-vrf
  
• Module 51: Air source VRF systems for flexible room heating and cooling, heat recovery and hydronic heating http://www.cibsejournal.com/cpd/modules/2013-04/
  
• Module 64: Evaluating and improving the performance of variable refrigerant flow air conditioning systems http://www.cibsejournal.com/cpd/modules/2014-05/
  
• Inverter compressor - Wikipedia http://en.wikipedia.org/wiki/Inverter_compressor
  
• VRF (Variable Refrigerant Flow) http://www.ebcorpo.com/vrf-variable-refrigerant-flow
• Variable Refrigerant Flow (US GSA) http://www.gsa.gov/portal/content/163491
  

---

| Created: Sep 2017 | Update: 16 Nov 2017 |