HVAC Multi-Split Variable Refrigerant Flow (VRF) (Ohio Timed & Monitored)

In HVAC Multi-Split Variable Refrigerant Flow (VRF), you'll learn ...

• The difference between multi-split air conditioning system and VRF systems
• Operating principles of direct expansion split and VRF system
• The concept of thermal zone
• How VRF with heat recovery are different from ordinary heat pump systems

Overview

To meet the Ohio Board's intent that online courses be "paced" by the provider, a timer will be used to record your study time. You will be unable to access the quiz until the required study time of 100 minutes has been met.

Credit: 2 PDH

Length: 30 pages

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

This course is suitable for mechanical, electrical, controls and HVAC engineers, architects, building designers, contractors, estimators, energy auditors and facility managers. In particular, personnel with a background in the air conditioning field will benefit from the valuable information in this course.

Learning Objectives

Upon completion of this course, participants will be able to:

• Distinguish between multi-split air-conditioning systems and variable refrigerant flow (VRF) systems.
• Explain the operating principles of direct-expansion split and VRF systems.
• Define the concept of a thermal zone.
• Compare VRF systems with heat recovery to ordinary heat pump systems.
• Describe the operation of thermostatic expansion valves (TXVs) and electronic expansion valves (EEVs).
• Explain the influence of building characteristics and load profiles on the selection of a VRF system.
• Identify the advantages and applications of VRF systems.
• Describe the design limitations and challenges associated with VRF systems.

Certificate of Completion

You will be able to immediately print a certificate of completion after passing a multiple-choice quiz consisting of 15 questions. PDH credits are not awarded until the course is completed and quiz is passed.