HVAC Variable Refrigerant Flow (VRF) Systems

A. Bhatia

About A. Bhatia

Mr. A. Bhatia is an online PDH course provider of continuing education courses for professional engineers.


Mr. Bhatia is a graduate engineer with 20 plus years of extensive experience in electro-mechanical engineering, procurement and construction industry. He has been involved in setting up grass root projects from zero to commissioning, interfacing with architects, machinery suppliers, vendors for projects nationally and globally.


He received 4-years bachelors' degree in Mechanical Engineering from an accredited Delhi university in India.


He specializes in conceptual design, optimization studies, energy efficient and environmentally responsible system designs for Infrastructure facilities, Green Buildings, Oil & Gas facilities, Power Plants and Metal & Mining. His core strengths are in the following areas:

  • HVAC, loss prevention and plumbing
  • Energy & Environment Conservation
  • Utility Systems (compressed air, water treatment, cooling, power generation, boiler systems, plumbing, etc)
  •  All type of mechanical package equipments (chillers, fans, pumps, conveyors, EOT cranes, DG sets, welding, machining, materials, heat transfer etc)
  •  Electrical and Control Systems (motors, power factor, short circuiting, transformers, AC/DC circuits)

In his current role, Mr. Bhatia provides consulting services to a number of facilities such as airports, commercial buildings, chemical, biomedical and pharmaceutical facilities, power generation, oil & gas, manufacturing, consumer products. Prior to this, he has worked with United Nations led program on energy conservation and clean development mechanism (CDM) jointly with renowned international experts specialized in their sectors. He has vast international experience on various global projects all over the world in US, UK, Australia, Canada and Middle East.


He has presented technical papers and has drafted nearly 70-energy audit and management reports. He has also published more than 100 technical courses for professional development hours.


COURSE NO: M03-014
PRICE: $72


Course Highlights

This continuing education online PDH course is NY approved. This course is also accepted in the States of AK, AL, AR, DE, FL, GA, IA, ID, IL, IN, KS, KY, LA, MD, ME, MI, MN, MO, MS, MT, NC, ND, NE, NH, NJ, NM, NV, OH, OK, OR, PA, SC, SD, TN, TX, UT, VA, WI, WV and WY.

In recent years air conditioning systems have significantly changed. Variable Refrigerant Flow (VRF) also known as variable refrigerant volume (VRV) is a commercial HVAC system that can be configured to utilize a single condensing unit with multiple indoor evaporator units. The arrangement provides an individualized comfort control by varying the flow of refrigerant to each evaporator unit using sophisticated electronic expansion valve and inverter controlled variable speed compressor.


The system delivers excellent part-load performance and simultaneous heating and cooling in different zones. Unfortunately, the design of VRF systems is more complicated and requires additional work compared to designing a conventional air conditioning system.


This course provides an overview of VRF system technology. Emphasis is placed on the control principles, terminology, basic components, advantages and design limitations.


This online PDH course is aimed at the personnel who have some limited background in the air conditioning field and is suitable for mechanical, electrical, controls and HVAC engineers, architects, building designers, contractors, estimators, energy auditors and facility managers.


In this course, you need to review the document titled HVAC - Variable Refrigerant Flow (VRF) Systems and provided below. Once you complete your course review, you need to take a multiple-choice quiz consisting of fifteen (15) questions to earn 3 PDH credits. The quiz will be based on the entire document.


Learning Objectives

This continuing education course is intended to provide you with the following specific knowledge and skills:

  • Understanding the difference between multi-split air-conditioning systems and VRF systems
  • Understanding the operating principle of a direct expansion split and a VRF system
  • Understanding the concept of thermal zone
  • Understanding how VRF systems with heat recovery are different from ordinary heat pump systems
  • Learning about the operation of thermostatic expansion valve (TXV)
  • Learning about the operation of electronic expansion valve (EEV)
  • Learning about the influence of building characteristics and load profile on the selection of a VRF system
  • Understanding the advantages and application of VRF systems
  • Learning about the design limitations and challenges in design of VRF systems

Course Document

To view, print and study the course document, please click on the following attachment(s):

HVAC Variable Refrigerant Flow (VRF) Systems (582 KB)

If you need Acrobat Reader to view and print this document, please click on the following link to download a free version of Acrobat Reader.

Get Adobe Reader to view PDH files

Course Quiz

To earn your PDH credits, you will need to buy the course and take the quiz by clicking on the following link:

Buy the Course and Take the Quiz

If you have any question, please contact us at info@cedengineering.com.