Overview
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.
To earn PDH credit, the student must pass a multiple-choice quiz consisting of fifteen (15) questions.
Specific Knowledge or Skill Obtained
This course teaches the following specific knowledge and skills:
- 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
- Operation of thermostatic expansion valve (TXV) and electronic expansion valve (EEV)
- The influence of building characteristics and load profile on selection of VRF system
- Advantages and application of VRF systems
- Design limitations and challenges in design of VRF systems
Course
Click on the following link to the PDF document to review the course material before taking the quiz for credit.
HVAC - Multi-Split Variable Refrigerant Flow (VRF) Systems
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